RAJASTHAN TECHNICAL UNIVERSITY , KOTA

Maharishi Arvind Institute of Engineering & TechnologyJaipur

A

Practical Training Report

On

“SURATGARH SUPER THERMAL POWER STATION”

2010-2011(12th May, 2010 - 12th June, 2010)

Submitted By:ARVIND SHARMA

07EMTME021Mechanical Engineering

2007-2011

CONTENTS

S.NO. TOPIC REMARK

1.

2.

3.

4.

5.

PREFACE

ACKNOWLEDGEMENT

ABOUT PLANT

PLANT FAMILIARIZATION(i) TUBINE(ii) BOILER(iii) E.S.P.(iv)COAL HANDLING PLANT(v)ASH HANDLING PLANT(vi) GENERATOR(vii)(viii)

CONTROL AND INSTRUMENTATION CIRCLE

(i) SWAS PACKAGE

(ii) ATRS PACKAGE

(iii) DDC PACKAGE

(iv) FSSS PACKAGE

PREFACE

A very important element in curriculum of an Engineering student is the Practical Training.

I under went practical training at “SURATGARH SUPER THERMAL POWER STATION” from 11-05-2010 to 11-06-2010. This is a part of total 30 days training program incorporated in the curriculum of the RAJASTHAN TECHNICAL UNIVERSITY for B.Tech. courses. This period was before my 6th sem. - B.Tech. Exams.

As I am a student of Mechanical Branch so the training at S.T.P.S. has been particularly beneficial for me. I saw the various procedures, processes and equipment used in production of electricity by thermal powers which were studied in books and this has helped me in better understanding of power generation.

S.T.P.S. is a very large plant and it is very difficult to acquire complete knowledge about it in a short span. I have tried to get acquainted with overall plant functioning and main concepts involved therein. The scope of Mechanical engineering is increasing day by day. It is a vital trade.

During training I was permitted to take training at many section of mechanical ( Boiler and maintenance, turbine , fan, Air pre heater, coal handling plant, water treatment plant, DM plant, coal mills) and general plant familiarization. I have summarized all the things, which I saw & learned at S.T.P.S. in this training report.

Thermal power stationA thermal power station is a power plant in which the prime mover is steam

driven.Water is heated, turns into steam and spins a steam turbine which either drives an electrical generator or does some other work, like ship propulsion. After it passes through the turbine, the steam is condensed in a condenser and recycled to where it was heated; this is known as a Rankine cycle. The greatest variation in the design of thermal power stations is due to the different fuel sources. Some prefer to use the term energy center because such facilities convert forms of heat energy into electrical energy.

SURATGARH SUPER THERMAL POWER STATION

Suratgarh Super Thermal Power Station is owned by Rajasthan Rajya Vidhyut Utpadan Nigam Ltd. and is situated near village Raiyanwali about 25 KM from Suratgarh town, an ideal location for setting up a thermal power station in the state having regards to the availability of land, water, transmission network proximity to broad gauge railway and being an important load centre for north west Rajasthan. The techno-economic clearance for the prefect was issued by CEA in June 1991 – the planning commission accorded investment sanction for the project in Nov. 91 for a total estimated cost of Rs. 1253.31 crores on prices prevailing in Sept. 1990. The updated cost of the project is estimate at Rs. 2300 crores of including IDC.

It has generation capacity of 1500 MW and installed with six Units of 250 MW each. It is a coal base thermal station. Water and coal required in a large amount. Coal is received here from coal-fields of MP areas through railways and water is received from INDIRA GANDHI CANAL. The supply of coal is from MP, Jarkhand by rail. About 18000 tonne coal required per day for whole unit and each unit consumes 150 tonnes coal per day.

About 2x3 km2 area covered by plant and approximately 1800 employees works in a plant including chief engineer to labour. The supply electricity to the northern Rajasthan, Ratangarh, Bikaner, Ganganagar.

FUTURE EXPENSION

It has been decided to set up 2 X 660 MW super critical units (Unit # 7 & 8) at SSTPS. For this purpose about 446 Hectare land has been identified adjacent to the existing 6 X 250 MW plant. This land is under process of acquisition. M/s TEC have been appointed consulting engineers for this project. The state Govt. has also accorded its inpriciple approval for setting up in future, two additional units of 2 X 660 MW (Unit # 9 & 10) also based on super critical technology.

Installed capacity

Following is the unit wise capacity of the plant:

Stage Unit Number Installed Capacity (MW) Date of Comisioning StatusStage I 1 250 May, 1998 RunningStage I 2 250 March, 2000 RunningStage II 3 250 October, 2001 RunningStage II 4 250 March, 2002 RunningStage III 5 250 June, 2003 RunningStage IV 6 660 May,2010 Future

ACKNOWLEDGEMENT

It is my proud privilege to express my sense of gratitude to Mr. Anil Dhawan (AEN) for providing me adequate facilities to undergo training at S.T.P.S.

I have in particular to appreciate the effort and keen interest taken by Mr. D. K. Nadheria (XEN), Mr. N. C. Jain (AEN), Mr. N. K. Jain (XEN) and Mr. Deepak Tater (JEN) for their kind help and assistance in under standing the working of diff. Equipment and for their kind guidance during the period of training. I am also grateful to Mr. Jangid (TA C&I) for their persistent help and for providing some of the technical data in form of computer print outs. Last but not the least I am equally obliged to all those engineers technical personnel and operators at S.T.P.S. who gave me their valuable time and rendered practical knowledge in my training period.And at last I want to thank my colleagues. Without their help guidance and suggestions it was not possible to produce this training report.

STEAM TURBINE

Introduction:

Steam turbine is a rotating machine which CONVERTS HEAT ENERGY OF STEAM TO MECHANICAL ENERGY.

In India, steam turbines of different capacities, varying from 15 MW to 500 MW, are employed in the field of thermal power generation.

Basic principles:The Thermal Power Plants with steam turbine uses Rankine cycle. Rankine cycle is a vapour power cycle having two basic characteristics:

1. the working fluid is a condensable vapour which is in liquid phase during part of the cycle and

2. The cycle consists of a succession of steady flow processes, with each processes carried out in a separate component specially designed for the purpose. Each constitute an open system, and all the components are connected in series so that as the fluid circulates through the power plant each fluid element passes through a cycle of mechanical and thermodynamic stages.

The turbine is of tandem compound design with separate HP, IP and LP cylinder. The HP & IP turbines are of single flow type while LP turbine is of double flow type; the turbine is condensing type with single reheat. It is basically engineered on reaction principle with throttle governing. The stages are arranged in HP, IP and LP turbines, driving alternating current full capacity Turbo generators.

Specification

Type - tandem compound condensing

Reaction

Rated output of turbine - 250 KW

Rated speed - 3000 RPM

Main steam temperature - 537 C

Rated pressure - 150 kg/cm

TURBINE COMPONENTSCasing or Cylinders: A casing is essentially a pressure vessel which must be capable of withstanding the maximum working pressure and temperature that can be produced within it. The working pressure aspects demand thicker and thicker casing and the temperature aspects demand thinner and thinner casings.

1. H.P Turbine Casing: The principal parts of the HP turbine casing are and axially split inner shell, enclosing the rotor and outer shell of a barrel-type construction. The barrel type of cylinder construction ensures symmetry of the wall thickness around the axis of rotation and hence the wall thickness itself is relatively less than that used in other type of construction.

2. I.P. Turbine Casing: The IP turbine is split axially and is of single shell design. The outer casing accommodates a double flow inner casing. The steam coming from the reheater is passed into the inner casing via admission branches which are symmetrically arranged in the top and bottom halves of the outer casing.

3. L.P Turbine Casing: The LP turbine is of double flow type. The casing is of triple shell, fabricated construction. The outer casing consists of the front and rear end walls, two longitudinal girders and a top cover. The inner shell of the inner casing acts as the guide blade carriers for the initial stages of the turbine. The guide blade carriers of the LP stage groups are so designed that, together with the inner casing, they form annular ducts which are used for extractions.

.

Turbine governing system

The main purpose of governor is to maintain this desired speed of turbine during fluctuations of load on the generator by varying steam input to the turbine.The governing system in addition to ensuring the falling load-speed characteristics of the turbine also ensures the following functions:

1. The run up the turbine from rest to rated speed and synchronizing with the grid.

2. Meeting the system load variations in a predetermined manner, when running in parallel with other machines.

3. Protecting the machine by reducing the load or shutting off completely in abnormal and emergency situations.

The governing system also includes other devices to protect the turbine from abnormal condition that may arise during operation.

In STPS By-pass Governing is used.

By-pass Governing: In this system, in general, the steam is supplied through a primary valve and is adequate to meet a major fraction of the maximum load which is called economic load loads less than this, the regulation is done by throttling steam through this valve. When the load on the turbine exceeds this economic load which can be developed by the unthrttole full flow through the primary valve, a secondary valve, is opened and throttled steam is supplied downstream, bypassing the first stage and some high-pressure stages. This steam joins the partially spent steam admitted through the primary valve, developing additional blade torque to meet the increased load.

Governing of Reheat Turbine In reheat turbines in cases of partial of full load ow off even after the HP control valves are fully closed the entrained steam in the reheaters and hot reheat line is more than enough to speed up the turbine above over speed limits. Hence it is necessary to provide stop valves and interceptor valves on hot reheat line before IP turbine. While the stop valve is operated controlled similar to HP control valve but at a higher speed range by a secondary of pre-emergency governor as it is called. The valve remains full open at rated speed and starts closing at about 3% overspeed and is fully closed at about 5% over speed.

1. , the surface friction and the turbulence set up in the oil.

BOILER

Introduction The boiler is the main part of any thermal power plant. It converts the fuel energy into steam energy. The fuel may be furnace oil, diesel oil, natural gas or coal. The boilers may be fired from the multiple fuels.The boiler installed in S.T.P.S. are made by M/s BHEL . Each of the boilers are single drum, tangential fired water tube naturally circulated over hanged, balanced draft, dry bottom reheat type and is designed for pulverizing coal firing with a max. Continuous steam output of 375 tons/hour at 138 kg/cm2 pressure and 540 degree cent. Temp. The thermal efficiency of each boiler at MCR is 86.8 %. Four no. Of bowl mills have been installed for each boiler. Oil burners are provided for initial start up and stabilization of low load .Two E.S.P. (one for each boiler) is arranged to handle flue gases from the respective boilers. The gases from E.S.P.are discharged through 180 meters high chimney. I.D. fan and a motor is provided near the chimney to induce the flue gases.

CIRCULATION SYSTEM:

It is essential to provide an adequate flow of water and/or of water-steam mixture for an efficient transfer of heat from furnace to the working fluid and to prevent ‘burn-outs’. This is irrespective of the mode of circulation being used.

In STPS NATURAL type of circulation system are used.

Natural Circulation: In this type, no external pumping device is used for the movement of the fluid.

The difference in densities in contents of fluids in down comers from the drum and risers in the furnaces is used to effect the movement of fluids. This type of circulation is employed in most of the utility boiler.

The movement of the steam and water will increase with increased heat input to a maximum value or so called end point, after which further increase in heat absorption will result in a decrease in flow.One of the characteristics of natural circulation is its tendency to provide the highest flow in the tubes with the greatest heat absorption.

Heat Transfer in Boiler:

In boiler heat energy is released from the combustion of fossil fuels and the heat is transferred to different fluids in the system and a part of it is lost or left out as unutilized.

There are three modes of heat transfer :

Conduction

Convection Radiation

Heat energy is transferred from a heat source to a heat receiver by one or more of these modes for which heat source should be at a higher temperature than the receiver.

In superheater tube with high temperature region but does not directly view the flame. Here the heat is transferred from flue gas to superheater tube metal by convection and by non-luminous radiation and in the tube metal by conduction and to the steam by forced convection.

The power plant boilers are large capacity steam generators used purely for the electrical power generation.

BOILER PRESSURE PARTS

Economizer:Economiser is a feed water heater.It uses the heat produced by the flue gases for

this purpose.The feed water is passed through the economiser before supplying it to the boiler and economiser absorbs a part of heat from the flue gas to increase the temperature of the feed water.

Super heater:The steam produced in the boiler has got moisture content so it is dried and superheated (ie steam temperature is increased above boiling point of water)by the flue gases on the way to chimney.Super heating ensures two benefits at first the overall efficiency of the system is increased and secondly the corrosion to the turbine blades due to condensation in later stages is prevented.The superheated steam from superheater is fed to steam turbine by means of a main valve.

Steam Flow: Saturated dry steam from the drum follows the course that is:

Steam cooled wall roof tubes –steam cooled side wall tubes – extended steam cooled side wall tubes – front steam cooled wall tubes – steam cooled roof and rear wall tubes- super heater rear horizontal assemblies – super heater de-super heater- platen super heater – pendant super heater.Super heated steam from the pendant super heater outlet header goes to the turbine via the main steam lines.After passing through the high-pressure stages of the turbine, steam is returned to the re-heater via the cold reheat lines. The reheat de-super heaters are located in the cold reheat lines.

Reheat flow through the unit is as follows: Front pendant re heater – rear pendant re-heater. After being reheated to the design temperature, the reheated steam is returned to the low-pressure section of the turbine via the hot reheat line.

Reheater: Reheater are provided to raise the temperature of the steam from which part

of energy already been extracted by HP turbine.The reheater is composed of two stages or section, the front pendant vertical

spaced platen section and the rea5r pendant vertical spaced platen section.The rear pendant vertical spaced section is located above the furnace arch

between the water- cooled screen tubes and rear water wall hanger tubes.The front pendant vertical spaced plated section is located between the rear

waterwall hanger tubes and the superheated platen section.All reheater drains and vents are opened before lighting off. The vents and

drains to the atmosphere must be closed prior to raising a vacuum in the condenser. Drains connecting with the condenser may be lift open until the boiler is under light load

Water Cooled Furnaces:

Bharat Heavy Electrical Limited has developed the modern water-cooled furnace. Furnace is the primary part of boiler where the chemical energy available in the fuel is converted to thermal energy by combustion. Furnace is designed for efficient and complete combustion. Major factors that assist for efficient combustion are time of residence (fuel) inside the furnace, temperature inside the furnace and turbulence which causes rapid mixing between fuel and air.It has following Advantage:

In furnace not only combustion but also heat transfer is taking place simultaneously.

The maintenance work involved in repairing the fire bricks is practically eliminated.

Due to heat transfer in the furnace the flue gas leaving the furnaces is reduced to the acceptable level to the superheating surfaces.

Soot Blowers:

Steam has mainly been used as the soot blowing medium, but recently the used low-pressure air as a soot blowing medium has been introduced as this offers a number of advantage.

AIR AND GAS PATH

General: The total air flow through the unit is handled by two numbers axial reaction

forced draft fans and two numbers axial reaction primary air fans. The flue gas produced in the furnace from combustion of fuel is evacuated by two numbers radial double suction Induced draft fans. The schematic of air and flue gas system is enclosed.

Air System:

1. Combustion Air (Secondary Air) : The forced draft fans supply the required secondary air for combustion.

This air is preheated by two no. RPAH. Control of secondary air flow is done by FD fan blade pitch control. The distribution of hot secondary air to the wind box compartments is controlled by “Secondary air dampers”.

2. Air for Drying and Transportation of pulverized coal (Primary Air) : The cold primary air fans supply the air required for drying the coal in the tube mills/mixing box and for transporting the pulverized fuel from both ends of the tube mill to the coal burners. The primary air is heated in the primary sectors of the Rotary RAPH.

The control for the primary air pressure is achieved through PA fan inlet dampers.

3. Scanner Cooling Air : Each boiler is provided with 20 no. VISIBLE LIGHT SCANNER. The two no. of scanner air fans are provided to supply the required air for cooling these flame scanners. The supply of air is taken from FD fan discharge. The air is filtered and boosted to the required pressure by the scanner air fans. Additionally an emergency air supply connection from atmosphere is provided for supplying the cooling air to the scanners in case both FD fans trip.

4. Seal Air : Six no. of seal air fans are (2 nos. per mill) are provided for each boiler. The sealing air is required for mill trunounim mill discharges valves and gravimetric feeders, of the two seal air fans provided for each tube mill, one is in operation and the other standby. The seal air takes suction from the atmosphere.

Gas system:

The flue gases produced in the furnace as a result of combustion, travels upward in the furnace, across the horizontal pass and downward through the second pass of the boiler to the air preheater. Two no. of Induced draft fans are provided to evacuate the flue gas from furnace to the chimney. The ID fans are provided with hydraulic coupling and inlet damper control.

PRESERVATION OF BOILERS

Atmospheric corrosion of ferrous materials proceeds rapidly in the presence of oxygen and moisture. The oxides produced are objectionable and can be transported to critical heat transfer areas as well as to the turbine. Pit type corrosion can also occur in walls. In large boilers, with numerous complex circuits and bends, it is practically impossible to completely dry the boiler in preparation for storage.

Fuel Oil Burning System

Fuel Oil Atomization: Atomizes the process of spraying the fuel oil into fine mist, for better mixing of the fuel with the combustion air. While passing through the spray nozzles of the oil gun, the pressure energy of the oil converts into velocity energy, which breaks up the oil stream into fine particles. for satisfactory atomization the viscosity shall be less than 15-20 centistokes.

HEA Ignitors: HEA Ignitors are provided in this Boiler. This ignitor uses LFO/HFO as main fuel and this is ignited using spark and is mounted adjacent to oil gun.

Air Cooled Oil Guns: The atomized assembly of an operating oil gun is protected from the hot furnace radiation by the flowing fuel oil and steam which keeps it relatively cool. The oil gun assemblies supplied for this project have been designed for air cooing provision.

Burner Trip Valves: To control the atomizing medium and fuel flow to the oil guns, pneumatic operated trip valves are used.

Main Parts of Boiler:1. The boilers consist of the following main parts:2. Forced Draft Fan (FDF)3. Air Preheater (RAH)4. Burners5. Furnace6. Up Rise Tubes7. Down Comer Tubes8. Water Tubes9. Super Heaters10.Gas Recirculation Fan (GRCF)11.Re-Heater12. Induced Draft Fan (IDF)

AIR PREHEATER

Air preheater is a heat exchanger in which air temp. is raised by transferring heat from other fluids such as flue gas . Since air heater can be successfully employed to reclaim heat from flue gas at lower temp. level ,then it is possible with economizer the heat ejected to chimney can be reduced to a great extent thus increasing the efficiency of a boiler.

Specification

1. Heating element - Hot end, Hot intermediate, Cold end Materials - Carbon & Corten steel

2. Rotor main drive motor - 11 kW, 1450 rpm, 50 Hz Coupling - Fluid coupling 11.5 fcu2. Bearing

Guide bearing : Spherical roller bearing Support bearing : Spherical roller thrust Thermostat: Burling thermostat

3. Oil capacity Guide brg. Housing : 25 lt. Support Brg. Housing: 150 lt.

4. Steam Coil Airpreheater Number of steam Coil APH : 2 Nos per boiler Installed position : Vertical Design Pressure: 20 kg/cm2

Design Temperature: 2500C Weight of One steam coil APH: 1950 kg.

CONDESER

The functions of condenser are:1. To provide lowest economic heat rejection temperature from the steam. Thus

saving on steam required per unit of electricity.2. To convert exhaust steams to water for reuse this saving on feed water

requirement.3. Deaeration of make-up water introduced in the condenser.4. To form a convenient point for introducing makes up water.

IN STPS RVUN SURFACE CONDESER is used.

Surface Condenser: This type is generally used for modern steam turbine installations. Condensation of exhaust steam takes place on the outer surface of the tubes, which are cooled by water flowing inside them.The condenser essentially consists of a shell, which encloses the steam space. Tubes carrying cooling water pass through the steam space. The tubes are supplied cooling water form inlet water box on one side and discharged, after taking away heat form the steam, to the outlet water box on the other side.Instead of one inlet and one outlet water boxes, the may be two or more pair of separate inlet-outlet water boxes, each supplying cooling water to a separate bundle of tubes. This enables cleaning and maintenance of part of the tubes while turbine can be kept running on a reduced load.

Description of condenser

The condenser group consists of two condensers, each connected with exhaust part of low pressure casing. A by-pass branch pipe has interconnected these woe condensers. The condenser has been designed to create vacuum at the exhaust of steam turbine and to provide pure condensate for reusing as feed water for the boilers. The tube layout of condenser has been arranged to ensure efficient heat transfer from steam to cooking water passing through the tubes, and at the same time the resistance to flow of steam has been reduced to the barest minimum.

350% capacity condensate pumping sets are installed for pumping the condensate from condenser to the deaerator4 through low-pressure heaters. Two pumps are for normal operation and one works as stand by pump.

Materials for Condenser tubes

Selection of tube material mainly on the quality of cooling water and the cost. Coppers alloys are preferred as copper has very high heat transfer coefficient. But as copper has very little mechanical strength; it has to be reinforced by alloying with other metals.

Stainless steel tubes has also been used and has good corrosion resistance though heat transfer coefficient is quite lower ht an the copper alloy.

Regenerative Feed Heating System

If steam is bled from a turbine and is made to give up its latent and any superheat it may possess, to a heater this system is called regenerative, because the fluid gives up heat, which would be otherwise wasted, to the fluid whilst in another state to raise its temperature. The highest theoretical temperature to which the feed water may be raised in the heater is the saturation temperature of the bled steam. There is an optimum point at which the steam is bled form the turbine once a feed temperature is selected, a tapping point near the stop valve produces no gain in efficiency as practically live steam is used for heating.

Regenerative system of 250 MW unit

The regenerative system of the turbine consists of four low-pressure heaters, two gland coolers, one deaerator and three high-pressure heaters. The condense is drawn by condensate pumps from the hot well of condenser and is pumped to the deaerator through gland coolers and low pressure heaters where it is progressively heated up by the steam extracted from seals and bled points of the turbine. The drain of condensate steam on LP heaters No. 2,3 and 4 flows in cascade and is ultimately pumped into the main condenasate line after heater No.2 or flows to condenser. The feed water after being deaerated in the deraerator is drawn buy the boiler feed pump and pumped to boiler through high pressure heaters where it is heated up by the bled steam from the turbine. The drain of condensed steam of HP heaters flows in cascade and under normal load conditions flows to the deaerator.

HP-LP BYPASS SYSTEM

This bypass system has been provided to allow the steam generator to build up, during start-up, matching steam parameter with the tribune. The steam generated is dumped into the condenser, thus avoiding loss of boiler water. This system enables starting of he unit of sliding parameters and also facilitates hot restarting of the unit. In the event of loss of load on the turbine, the bypass system disposes the steam produced by; the boiler automatically to he condenser without affecting the boiler operation.

The bypass system had two sections: HP & LP. The HP-Bypass system diverts the steam before main steam valve to he cold reheat CRH line. HP Bypass system also reduces the rated steam parameters of the incoming steam from the superheated to the steam condition expected in the CRH line (i.e. steam temp. and pressure after HP turbine exhaust).

The LP Bypass diverts the incoming steam from hot reheat line before intercepting valves to he condenser after reducing the HRH steam parameters to the conditions approximately to that of LP steam turbine exhaust steam.

HP Bypass station is utilised for the following tasks:

1. To establish flow at the outlet of superheated for raising boiler parameters during starts up.

2. To maintain or controls steam pressure at pre-set value in main steam line during start up.

3. To warm up the steam lines.4. To control steam temperature down of HP bypass at the reset value

LP Bypass station is utilised for the following tasks:

1. Control of steam pressure after reheater.2. Establish flow of steam from reheat lines to condenser by its opening,

proportional to the opening of HP bypass valves.

DEAERATER

Condensate from hot well is pumped to de aerator by condensate extraction pump. Functions of de aerator are: -1. Removal of dissolved air/oxygen in boiler water.2. Chemical dosing for maintaining quality of boiler water.

3. Regenerative heating of feed water for increasing its temperature and efficiency of plant.

4. Storage of feed water in water/steam cycle.

Booster Pump

WORKING:50 % tandem boiler feed pump sets are supplied to this contact, three pump sets for each boiler. Two sets are run in parallel, supplying each boiler, with one pump set being on stand-by. Each pump set consists of a “FA1856” booster pump, directly driven form one end of the shaft of an electric driving motor, and a “FK6D30’ boiler feed pump driven from the opposite end of the motor shaft through a variable speed turbo-coupling. The drive is transmitted, in each case through a spacer type flexible coupling.The bearings in the booster pump and pressure stage pump and in the motor are lubricated from a forced lubricating oil system incorporated in the turbo coupling.The booster pump is a single stage, horizontal, axial split casing type, having the suction and discharge branches on the casing bottom half, thus allowing the pump internals to be removed without disturbing the suction and discharge pipe work of the alignment between the pump and the motor.The pump shaft is sealed at the drive end and the non-drive end by mechanical seals which are flushed by a supply of clarified water.

TECHNICAL DATA: Pump type : FA1856

Direction of rotation : Anti - clockwise

(Viewed from drive end)

Liquid pumped : Boiler Feed Water

Suction temp. : 161.10C

Flow rate : 490 m3/hr.

Efficiency : 81 %

Input power : 151 KW

Speed of pump : 1485 rpm

Components of Booster Pump:

Pump Casing Rotating Assembly Journal and Thrust bearing Bearing Housing

Mechanical Seals Motor / Pump Casing

Boiler Feed pump

WORKING:

The FK6D30 type Boiler Feed Pump is a six stage, horizontal centrifugal pump of barrel casing design.The pump internals are designed as cartridge which can be easily removed for maintenance without disturbing the suction and discharge piping work or the alignment of the pump and the turbo coupling.The pump shaft is sealed at the drive end and non-drive end by mechanical seals, each seal being flushed by water in a closed circuit and which is circulated by the action is cooled by, [assign through a seal cooler, one per pump, which is circulated with clarified cooling water. The rotating assembly is supported by plain white metal lined journal bearings and axially located by a Glacier double tilting pad thrust bearing.

TECHNICAL DATA:

Pump type : FK6D30

No. of stages : 6

Direction of rotation : Anti – clockwise

(Viewed form drive end)

Suction temp. : 161.10C

Design flow : 490 m3/hr.

Efficiency : 81 %

Speed : 5310 rpm

Input power : 3322 KW

Drive Motor

Manufacturer : B.H.E.L., Haridwar

Rating : 3550 KW

Speed : 1492 rpm

Electrical supply : 6.6 kv, 3-ph, 50 Hz

Components of Boiler Feed Pump: Pump Casing

Discharge Cover Suction Guide Ring Section Assembly Mechanical Seal Journal and Thrust bearing Bearing Housing Hydraulic Balance Flexible Coupling

The lubricating oil for the journal and thrust bearings, of the booster pump and boiler feed pumps and the drive motor will be supplied form the lubrication oil system associated with the hydraulic coupling and should be as follows:

Condensate Extraction Pump

Technical Specification:

Type : EN 8 H 32

Direction of rotation viewed : Clock-wise

Suction temp. : 46.10C

Sp. Gravity : 0.9901

Speed : 1485

Power absorbed : 266 KW

Efficiency : 78 %

WORKING:

The condensate Extraction Pumps are of the vertical, eight stage, Centrifugal canister type, with the driving motor supported on a fabricated head piece and the eight inter connected pump stage are suspended below the head piece. The pump discharge branch and suction branch are formed on the head piece above floor level. The eight pump stages are contained within a fabricated canister, and each stage casing is located by spigot and secured together with bolts, nuts and lock washer. The canister is suspended and secure to a foundation ring with screws. The head piece is also secure to the canister with screws.Each pump directly driven through a flexible coupling by a 325 KW electric motor. Components of Condensate Extraction Pumps:

Head piece Foundation Ring Canister Stuffing Box Assembly Thrust and journal bearing assembly Coupling Driving motor

In SURATGARH THERMAL POWER PLANT, there are three fans:

1. F.D.FAN (Forced fan)2. I.D.FAN (Induced fan)3. P.A.FAN (Primary fan)

Forced Draft Fan

In the Axial Reaction Fans (Type AP), the major part of (about 80 %) energy transferred is converted into static pressure in the impeller itself. The rest of the energy is converted into static pressure in the diffuser. These fans are generally driven at constant speed. The flow is controlled by varying the angle of incidence of impeller blades. It therefore becomes possible by this process to achieve high efficiencies even during part load operation. The blade pitching operation is performed by mechanical linkages connected to a hydraulic servomotor which is flanged to the impeller.

Technical Data:

Application : Forced Draft Fan

No. off : 2

Medium handled : Atmospheric Air

Orientation : Vertical Suction and

Horizontal Delivery

Capacity : 105.2 m3/Sec

Temp. Of medium : 450C

Speed : 1480 rpm

Coupling : Rigiflex coupling

Drive motor

Rating : 700 KW

Speed : 1480 rpm

Fan Weight : 8 Tones

Type of fan regulation : Blade Pitch Control

When looking in flow direction, the fan consists of the following Components:

Suction chamber

Fan Housing

Rotor Consisting go shaft, one impeller with adjustable blades with pitch

control mechanism.

Main bearings (Antifriction bearings)

Outlet Guide Vane housing with guide vanes

Diffuser

Fan Accessories: Rigiflex Shaft Coupling:

The fan shaft is connected to the motor shaft by means of Rigiflex couplings.

Oil Circulation System : The oil system consists of an oil tank, two pumps(on Stand by), filters, coolers and necessary fitting.

Drive Motor: These fans are driven by constant speed Synchronous Induction

motors. Silencer: These fans are provided with a silencer to attenuate. Airborne noise to acceptable level.

Lubrication: The lubrication oil for the fan bearings ate supplied by the centralized oil pumps which supply oil for the hydraulic servo meter also.

Recommend Oil: Servo Prime - 68 of IOC

Turbinal - 68 of HPC

INDUCED DRAFT FAN

Radial fans manufactured are single stage, single/ double suction, simply supported/overhung centrifugal machine which can be used to handle fresh air as will as hot gases in power plant application. In this, the medium handled enters the impeller axially and after passing through the impeller leaves radially. A large part of the energy transferred to the medium is converted into kinetic energy as the medium passes through the impeller. The spiral casing converts part of the kinetic energy in the medium to pressure energy. These fans are generally driven by constant speed motors. The output of the fan is usually controlled by inlet dampers or inlet guide vanes or by varying the speed of the fan by suitable speed control device.

Technical data: Application : Induced Draft Fan

No. off : 3

Type : NDZV 33 S

Medium handled : Flue Gas

Orientation : 450 Top incl. Suction

Bottom Horizontal,

Delivery

Capacity : 250.5 m3/Sec

Temp. of medium : 1540C

Speed : 740 rpm

Coupling : Hydraulic Coupling

Drive motor

Rating : 1750 KW

Speed : 740 rpm

Fan Weight : 52.7 Tones

The major sub-assemblies of the fan are as follows:

Impeller with shaft assembly

Bearings and thermometers

Suction chamber and spiral casing

Flow regulation devices

Shaft seals

Couplings

The fan is drive by an electric motor.

The fan bearings are lubricated by means of oil lubrication. The oil must not foam during operation. Foam removingagents containing silicon must not be utilized. The oil must have goodanti-corrosion properties.

PRIMARY AIR FAN

PA Fan is same as forced draft fan. Only the differences is that in this fan there are two stages AP fan(Axial Profiles fan), the two impellers are connected by means of a link rod, with this we can operate both the impeller blades synchronously.

Technical data : Application : Primary Air Fan

No. off : 3

Type : AP 2 17/12

Medium Handled : Atmospheric Air

Speed : 1480 rpm

Rating : 1400 KW

Fan wt. : 10.8 tones

E.S.P.E.S.P THEORY

E.S.P. is a highly efficient device for extraction of suspended particles and fly ash from the industrial flue gases.

WORKING PRINCIPLE :

E.S.P can handle large volume of gases from which solid particles are to be removed Advantages of E.S.P. are :- High collection efficiency Low resistance path for gas flow Treatment of large volumes at high temp.Ability of cope with corrosive atm.An E.S.P. can be defined as a

device which utilized electric forces to separate suspended particles from flue gases WORKING STEPS : Ionization of gases and charging of dust particles Migration of dust particles. Deposition of charge particles on collector surface. Removal of paE.S.P. consist of two sets of electrodes, one in the form of thin wire, called discharge or emitting electrode in the form of plates. The emitting electrodes are placed in the center or midway between two plates and are connected to-ve polarity of H.V. D.C source of order of 37 KV collecting electrodes are connected to + ve polarity. The voltage gradient between electrodes creates “CORONA DISCHARGE”, Ionizing the gas molecules. The dust particles present in flue gases acquire -ve charge and deposited on collecting electrodes. The deposited particles are removed by knocking the electrode by a process called “RAPPING’ DONE BY “ RAPPING MOTORS”.

Cooling Towers:Cooling towers are heat removal devices used to transfer process waste heat to theatmosphere. Cooling towers may either use the evaporation of water to remove process heat andcool the working fluid to near the wet-bulb air temperature or rely solely on air to cool theworking fluid to near the dry-bulb air temperature. Common applications include cooling thecirculating water used in oil refineries, chemical plants, power stations.Cooling Water Pump:The motor of the CWP has following specification;

Type: Y1600-16/2150

Out Put Power: 1600KW

Stator Voltage: 6.6KV

Speed: 372rpm

Frequency: 50Hz

Stator Rated Current:182A

Stator Connection: 2Y

Ambient Temperature: 50C

Insulation Class B

Weight 17500Kg

CW Pump:

Type is single stage double suction centrifugal pump

Type: 1400S25-1

Capacity: 16000m3/H

Speed: 370rpm

Power : 1600KW

Weight : 35000kg

Head : 25m

NP SHR : 8.5m

COAL HANDLING PLANT

Wagon tippler has rated unloading capacity of twelve box wagon per hour, including shunting and spotting time of haulage equipment. For vibrating feeders of capacity 350 tons/hr. each have been provided feeding unloads coal. A steel hopper has been provided in crusher house to receive coal and distribute it through manually operated rack and pinion gate to three vibrating screens of 675 t/hr. capacity each coal above 200 mm size passes on granules for crushing and reduction in size. Coal below 20 mm size passes granular and discharged on to crushed coal conveyor belt. Following permutation and combination of operation are possible with installed system. To transfer all crushed coal received from crusher house to live storage pipe. To transfer part of received crushed coal to plant and to balance to storage yard. To deliver the raw coal bunkers part and received crushed coal mixed with balanced coal from the live storage pipe. To transfer the plant crushed coal at 750 T/hr from the reclaim live pile and simultaneously stock and s/ road. the vibrating ones as stated above can be obtained by the use of flap gates which are installed on various chute and two vibrating feeders, installed on tower. The coal carried on various conveyers shall be main monitored to ensure proper loading and distributing weightless and vibrating feeders.

ASH HANDLING PLANT

The ash handling system provide for continuous collection of bottom ash from

the furnace hearth and its intermittent removal by hydro ejectors to a common slurry sump. It also provides for removal of fly ash to the common slurry sump. Each boiler is provided with ash precipitator for collecting the fly ash from the flue gases with high efficiency of collection to minimize the dust mains and to reduce the wear of induced draft fan. The fly ash separated from flue gases in the ash precipitator is collected in hoppers at the bottom from where it is mixed with water to form slurry and disposed off to pumping area by means of hydro ash pumps. Bottom ash from the boiler furnace is passed through slag crushers and then slurred to the slurry chamber at the suction of the ash disposal pumps. These are high pressure and low pressure pumps for this purpose. At a time one pump is working and other two are stand by. From the ash disposal pump house ash slurry is pumped through pipe lines to the ash dump area within about 1.5 km away from the ash disposal pump house. Too separate discharge lines are provided one for each unit but only one line is used. The ash slurry from the two units is taken in one discharge line through electrically operated valves.

WATER TREATMENT

INTRODUCTION: The natural water contains solid, liquid and gaseous impurities and therefore, this water cannot be used for the generation of steam in the boilers. The impurities present in the water should be removed before its use in steam generation. The necessity for reducing the corrosive nature & quantity of dissolved and suspended solids in feed water has become increasingly important with the advent for high pressure, critical & supercritical boilers.

IMPURITIES IN WATER:

The impurities present in the feed water are classified as given below –

1. Undissolved and suspended solid materials

Turbidity and Sediment Sodium and Potassium Salts Chlorides Iron Manganese & Silica

2. Dissolved Salts and Minerals Calcium and Magnesium Slats

3. Dissolved Gases Oxygen Carbon Dioxide

4. Other Materials Free Mineral Acid Oil

RAW WATER AND IMPURITIES:

Source: The various sources of water can be broadly classifies as:

a) Rain waterb) Surface water (Rivers, Streams,

Ponds, Lakes)c) Ground water ( Springs, Shallow

wells and Deep Wells)

Impurities:

The major impurities of water can be classified in three main groups are:

Non- ionic and Undissolved : These are mainly turbidity,

slat,mud, dirt and other suspended matter

1. .Ionic and Dissolved

2. Gaseous Impurities : Carbon Dioxide and Oxygen

Removal Of Impurities: Our major concern is industrial water treatment, whereby, water used directly or indirectly in an industrial process is made suitable for that particular application. The use of water in boilers fro steam generation is an obvious industrial use. Depending on the process, varying degrees of purity of treated water are required. For example, a textile processing unit will require soft and clear water for process use: a chemical plant or electronic components manufacturing unit will require ultra-pure water containing total dissolved impurities not exceeding 0.5mg/litre or less.

MILLING PLANT

Pulverized coal Systems:

For steam generation, there is basically system of pulverization normally in STPS plant used is Direct Firing System

Direct Firing System:

1. Hot Primary System:

In this system the fan is located before the pulverized and handles complete primary air required for drying a transporting the coal. Disadvantages are that the fan is required to handle high temperature air resulting in high a fan power. Separate sealing air fans are required to seal the mill and Journal bearings.

2. Cold Primary Air System:

The primary air fan handles clean cold air either from FD fan discharge or taking suction from atmosphere. The advantages are saving in fan power and maintenance. The only disadvantage. Is the cost increase due to additional duct work and air heater.

3. Suction System:

In this system the mill operates under negative pressure. Suction being created by an exhauster placed after the mill. The exhauster handles all the coal air mixture and forces it into the burners. The advantage of suction system is that the plant can be maintained clean. The disadvantage of this system id that he high speed exhauster has to handle coal air mixture and tends to wear more as the pulverized size increase.

4. Pressurized Exhauster system:

In this system the mills operate under positive pressure. With exhauster provided at hr exit of pulverize to boost the pulverized coal into the pressurized furnace. Since the pulverized operates with lesser pressure than forced draft fan pressure.

In plant TUBE type of pulverized mill is used.

Drum/Tube mills:

This type mills is slow speed type. They operate at a speed of 17-20 rev/min and formerly were designed as suction mills. The mill drum carrying the ball charge rotate in the antifriction bearings. Raw-coal is fed to the drum through the inlet elbow and gets crushed to powder inside the mill drum. The ball charge and the coal are carried to certain height inside the drum and slowed to fall down. Due to the impact of the balls on cola particle sand due to attrition as the particles slide over each other and

also over the liners, the coal gets crushed. Hot flue gases are used for drying and transporting the pulverized coal from the mill to the classifier. As a result of this high availability in a tube- ball mill installation, it is not normal to provide standby milling capacity; this helps to reduce the overall capital cost of the plant. Power requirements have also been reduced, but they are still much greater than those for medium-speed mills.

Advantage:

High output possible, up to 50 tones per hour.

No maintenance over long periods

High availability

Because of high availability no stand by

capacity is required

No mill rejects, no problems with ‘tramp’ iron

Reserve of fuel within mill makes output more

stable.

Disadvantage:

High power consumption

Some problems with control of coal level

within the mill.

Virtually constant power consumption at all

loads; low load operation of therefore not

economical.

With high moisture content fuels a high

primary air temperature is required because of

the low air /fuel ratio

Unplanned stops leave the mill full of coal

which, under unfavorable conditions, can

ignite. This coal has to be quenched and even

dug out otherwise the mill cannot be restarted.

COAL FEEDERS

Coal feeders deliver the cola from the bunkers to the mill. Since the amount of coal delivered determines the output of the mill, if follows that the cola flow, through the feeder has to be controlled. This is normally achieved either by control of feeder speed or by control of the position of a scraper knife or plough.

In plant Drag Link Coal Feeders type of Coal Feeder is used.

Drag Link Coal Feeders:

In this type of cola feeder, the coal leaves the bottom of the bunker through a large outlet hopper which is connected directly to the feeder casing. The cola falls on the feeder top plate and is dragged along by the conveyor chain to the point where the top plate ends. The depth of the cola bed is controlled by the height regulating gate. At the end of the top plate the cola falls down between the stands of the chains to the Point of discharge at the mill inlet coal delivery chute. The rate of coal feeds controlled by variable speed motor drive.

GENERATORMechanical energy is converted into

electric power the stator windings of generator by the interaction of rotating magnetic field. Rotating magnetic field is created by field windings mounted on rotor shaft with the help of excitation system. When the shaft is rotated at 3000 RPM by the coupled turbine electric power is generated at a voltage 16.5 KV and 50 HZ frequency. Generator is filled with hydrogen gas for cooling its winding which in turn is cooled by circulating water. The voltage of such generated electricity is step up to 220kv or 400kv through transformer and power transmitted to Ratangarh GSS for Northern Grid, and different areas of Rajasthan.

6.0 million units energy is generated in 250 MW unit in a single day, out of this about ten percent is consumed in unit itself for running its auxiliary

equipments like pumps, fans etc. about 3300 metric tons of coal is consumed in one 250 MW unit in one day.

THEORY Turbo generator manefactured by BHEL in Co-Operate with most modern design concept and constructional features which ensures reliability, easy and constructional and operational economicity. There is a provision for cooling water in order to maintain a constant temp. of coolant (hydrogen) which controls the temp. of wdg., core etc as per loads.

Technical Data:

• Apparent power 294MVA

• Active Power 250 MW

• Current 10290 Amps.

• Voltage 16.5 kV+/- 825V

• Speed 3000 rpm

• Power Factor 0.85

• Hydrogen Pr. 3.0 bar

• Rated Field Current 2386 Amps

.

CONTROL AND INSTRUMENTATION CIRCLE: - STPS have divided four sections in C&I (control & instrumentation) Circle: -

1. SWAS package2. FSSS package3. ATRS package4. DDC section

SWAS [ Steam Water Analasis System ]: - Steam Water Analysis System is full form of SWAS. SWAS package is use for analysis of steam sample which coming from Boiler. There are coming nine lines from the Boiler. These nine lines go in cooling system for temperature Maintain. There are two types of cooling system, Primary cooling system and Secondary cooling system. The equipment is designed and assembled to enable the conditioning of samples of Boiler water and steam by reducing the temperature and pressure to a suitable state to enable the chemical parameters of the sample to be monitored.

Sample conditioning panel comprises: -Line Numbers: -

1. Make up drum water2. Conedensate pump

Discharge3. LP Heater inlet 4. Feed water booster

pump 5. Feed water

economizer inlet 6. Boiler drum water 7. Boiler saturated

steam8. Main steam 9. Hot well

Steam samplesForm Boiler

There are different measurements of samples of steam: -

SODIMAT: - The measurement of sodium in industrial ultrapure waters. The measurement is based on a direct potentionetric technique. Technique using highly sensitive sodium glass electrode. The difference of potential between the glass electrode and the reference electrode is directly proportional to the sodium concentration. Modern high-pressure power plants require feed water of very high purity. Safety in that sector is of great importance and the sodium measurement plays a specific role compared to pH, conductivity and silica trace. Actually sodium cations and anions are always linked. Most cations have a corrosive influence in water and vapor cooling circuits. Became of this chemical link between sodium ions and anions, sodium measurement presents particularly important risk of corrosion and other effects. The SODIMAT uses a

PrimaryCooling

SecondaryCooling

Conditioning P & T

Dry Panel

BLOCK DIGRAM OF SWAS PACKAGE

sodium sensitive glass electrode to measure sodium in a sample which has been previously conditioned to a pH > 10.

HYDRASTAT: - low-carbon steel exhibits a significantly improved resistance to corrosion it in contact with water of high alkalinity (pH 9-10).High – pressure circuits operating with the alkaline reign, therefore employ volatile alkalizing agents such as ammonia in combination with hydrazine to elevate the feed water pH to a level > pH 9.0. The addition of hydrazine serves the dual function of an alkalizing agent as well as on oxygen scavenger thus lowering the level of corrosion. The anodic dissolution of iron in low carbon steels is nominal at ph 9.5 provided the totally demineralized water is available ammonia concentrations required to reach this high degree of alkalinity would be detrimental to the copper tubes of the condenser because of dissolution of copper, thus imposing an upper limit of ph 9-9.3. CONDUCTIVITY MEASURMENT: - The electric conductivity measures the transport of electric change in any field. In metal conductors the current flows by transport of electrons where as in solution. It flows by transportation such as Na+ and Cl- which the higher transport of charges is the conductance of the solution.Conductivity is the capacity of a solution has to conduct current: -

In solution conductivity is much more complicated than in conductors because several species ensure the transport of charge for instance in drinking water the conductive species registered are sodium, calcium, magnesium, ferrous cations, ferrites, phosphates and nitrate ions for slightly concentrated solution. The concentration of H+ protons and hydroxyl OH- ions can no longer be neglected in the presence of the product this. Therefore leads to a non-linear variation conductivity/ concentration.

SILICOSTAT: - Hp turbine nozzles and blades may, under the influence of high-pressure superheated steam exhibits significant capacity and conversion efficiency losses as a result of silica contaminated steam latter tends to from insoluble deposits on critical part of the turbine leading to surface roughness which, in turn, is detrimental to turbine efficiency. In order to assure optimum turbine performance continuous monitoring of silica in superheated steam, boiler water and feedwater is of the utmost importance. The polymetron silcostat has been designed specifically to complete this task.

Analyzers: -

Lines Coming from Type of Analysis

Line 1 Make up Drum water

Specific conductivity

Line 2 Conedensate pump discharge

pH, specific conductivity, cation conductivity, dissolved oxygen, sodium.

Line 3 LP heater / inlet pH, specific conductivity, dissolved

Oxygen.

Line 4 Feed water booster pump

Dissolved

Oxygen.

Line 5 Feed water Economizer inlet

pH, specific conductivity, cation

conductivity, silica,

Hydrazine.

Line 6 Boiler drum water pH, specific conductivity, silica.

Line 7 Boiler saturatedSteam

Specific conductivity, cation conductivity.

Line 8 Main steam Specific conductivity, cation conductivity, silica.

Line 9 Hot well (2 off) Specific conductivity.

The sample analysis panel comprises the following analyzers: - No. of Analyzers

Analysis

1 Single channel silica 1 Two channel silica 2 Dissolved oxygen 1 Hydrazine 14 Conductivity 4 pH 1 Sodium

ATRS [Automatic Turbine Run Up System ]: -

Introduction- All control function related to turbine are realized by Microprocessor based PROCONTROL ATRS System. This is based on user friendly programming languageP10. The system is divided in three sub groups: - 1. SGC-Oil :- Oil pumps(AOP,EOP,JOP)

interlocks, automatic & protn. Operation are realized in this group.

2. SGC-Conden. & Evac . : - CEP’s & vacuum pump operation.

3. SGC-Turbine :- For automatic synchronization of machine to the grid. Procontrol requires serial data exchange confined to the electronic room(panels), process computer(monitoring) and control room.

HARDWARE The data transmission is performed with two level serial bus system- Local Bus : - Local bus interconnects all

input, output, and processing electronic modules, which is part of station. Each

local bus work independently from any other local bus or Intra-Plant.

Intra – Plant Bus : - This bus interconnects its related local buses via coaxial cables. And through which Monitoring computer and diagnostic station connected. The local bus can be grouped together in the same panel or distributed in different panels. Each massage is cyclically transmitted over the local as well as intra- plant buses and transmission freq. Is selectable and can be every 10 ms.

PROCONTROL has following basic type of electronic modules: - Individual Control modules : - These

implemented to control, supervise, monitor, protect individual valves, pumps, fans etc. Modules equipped with a microprocessor, built-in l/o and dedicated control entity to control element. A serial l/o interface to the local bus to receive process signals required for interlaces & permissive logoc. Hardwired interface is also provided to control room. Modules are- AS45, AS46, AS47.

Programmable Processor :- This modules used for automation and superimposed on the individual control modules and allows to build control, protection and alarms. Module is-PR05.

Input/Output modules :- Various modules for input/output capabilities and connected to local bus. These modules can handle single, double throw contacts, thermocouple, RTD’s, milliamp signals etc. or to provide milliamp, voltage, electronic contact output signals.

LOGIC: -

TURBINE PROTACTIONSN SERVICE ALARM TRIP1 Lub oil Pr V. Low 2.1kg/cm2 (2 out of Pr. Swth. Oprt.)

2 Cond vacuum V. Low -0.8 -0.7kg/cm2 (2 out of 3 vac. Swth. Oprt.)

3 HPT Exhst Stm Tmp V. Hi 480 510 (2 out of 3 T/C Tmp. Rises)

4 Axial Shift V. Hi +/- 0.5mm. +/- 1.0mm (2 out of 3 Senser optd.)

Protection ON:- 1) FIRE PROT.2 CH-1 (2) FIRE PROT.2 CH-2 3)ANY JOP ON & SPEED<10 RPM &SPEED RELEASE & SO/H2 DP>1.2 BAR EMER.OIL PUMP(EOP-DC) Protection ON:- 1 SLC EOP-DC CMD-51

(i) SLC EOP-DC ON & EOP AC FAIL & L.O.PR<2.1

(ii) SLC EOP-DC ON & EOP AC OFF & EOP AC DIST. & LUBE OIL PR<2.1

EMER. OIL PUMP(EOP-AC)

Protection ON:- 1)FIRE PROT.2 CH-1 (2)FIRE PROT.2 CH-2(3)EOP AC PROT. ON

(i) SLC EOPAC ON & LUB OIL PR<2.1

(ii) EOP DC ONJACKING OIL PUMP-2 (JOP-DC)

Per. ON:- JOP-1(AC) OFF

Auto ON:- 1.SLC JOP-2 CMD-51 (i)SLC JOP-2 ON & JOP PR.<100 &TUR SPEED<510 (ii)SLC JOP-2 ON &JOP-1 OFF & JOP-1 DIST.

(iii) SLC JOP-2 ON & JOP AC FAIL & TUR SPEED<510

Prot. ON:- 1) FIRE PROT.2 CH-1 (2)FIRE PROT. 2 CH-2 3) JOP-1 OFF & JOP AC FAIL & TUR SPEED<510

Prot. ON:- 1)FIRE PROT.2 CH-1 (2)FIRE PROT.2 CH-2 3) JOP-1 OFF & JOPAC FAIL & TUR SPEED>15 & TUR

SPD<2800