Durgapur Steel Thermal Power Station (DSTPS), DVC, Andal
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Transcript of Durgapur Steel Thermal Power Station (DSTPS), DVC, Andal
Durgapur Steel Thermal Power StationDVC, Andal
Abhishek GoraiRoll – 12/ME/13Mechanical EngineeringNational Institute of TechnologyDurgapur
About
▪ Situated at Andal, Durgapur, W B (co-ordinates 23°34'48"N, 87°12'19"E)
▪ Installed Capacity : 2x500 MW
▪ Running Capacity :350 MW (1x140 + 1x210 MW)
Overview
Chemical Energy (Fuel)
Heat Energy (Steam)
Mechanical Energy (Rotation of
Turbine)
Electrical Energy
Fuel
Water
Air
Combustion
Steam Generation
Treatment
Conditioning
CoalOil
Heat
DM Plant
Power Generation
Turbine Generator
Flue Gas
Cooling System
Wastewater
Water PackagingSource of Raw Water : Damodar RiverWater Requirement: To provide make-up water to the water/steam cycle. For cooling of the steam for re-use as condensate. For general domestic use.
RESERVOIR AERATOR
DM PLANT
BOILER MAKE-UP
CW MAKE-UP DMF
POTABLE WATER
GRAVITY FILTER
CLARIFLOCCULATOR
Water Packaging : De-Mineralization Plant
Activated Carbon
Filter
Strong Acidic Cation
Exchanger
Degasser
Tower
Strong Basic Anion Exchanger
Mixed
Bed
Ultra Filtration
SKID
DM Water
Storage Tank
Coal Handling Plant (CHP)▪ Track Hopper▪ Wagon Tippler▪ Crusher House▪ Stacker-cum-Reclaimer▪ Conveyor Belts▪ Raw Coal Bunker
Coal Mill (Pulverizer)
▪ Supplies pulverized coal as per steam generation requirement
▪ Facilitates combustion by pre-combustion drying up.
▪ Separates incombustibles.
DSTPS has 10 Bowl Mills for each boilerName : 803XRP
Boiler▪ Steam is generated from DM water by heat addition to
DM water at constant pressure & temperature.Boiler Description at DSTPS, Andal▪ Top supported, fusion welded▪ Vertical water-tube boiler▪ Controlled Circulation▪ 4-corner tilting tangential firing
Boiler Mountings▪ Pressure Gauges– For measuring pressures at various points
▪ Valves– For safety, and to maintain unidirectional flow
▪ Water Level Indicator– For optimum running of boiler
▪ LRSB (Long Retractable Soot Blower)– For cleaning soot from boiler’s inner surfaces
▪ Tapping and Manholes– Maintenance Purpose
Boiler Accessories
▪ Air Preheater– Air is pre-heated by flue gases to ensure complete combustion of even
low-grade fuel, like Lignite.
▪ Economizer– Feed-water is heated by the outgoing flue gases before entering boiler
drum.
▪ Superheaters– Steam is heated to higher temperature to ensure dryness fraction
remains above 0.8
▪ Reheaters– Steam is reheated between HPT and IPT, and again between IPT and LPT
Turbines▪ 3 turbines : HP, IP, and LP▪ High Pressure Turbine (HPT)– 17 stages
▪ Intermediate Pressure Turbine (IPT)– 12 x 2 stages
▪ Low Pressure Turbine (LPT)– 6x2 stages
▪ 3000 RPM▪ Heat Rate : 1944.4 kcal/kWh
Generator and Exciter
▪ Generates electrical power by the interaction of the rotating magnetic fields of the stator and rotor
kW: 500000 Speed: 3000 RPMkVA: 588000 Frequency: 50 HzP.F.: 0.85 Lag Coolant: H2 and H2OMade at BHEL, Haridwar▪ Brushless excitation system
Auxiliaries
▪ Regenerators– HP Heaters (3 nos)– LP Heaters (3 nos)
▪ Boiler Feed Pump– Pressurizes feed water from De-
aerator before entering into boiler– Turbine Driven Boiler Feed Pump▪ works with steam extracted from IP
turbine exhaust.– Motor Driven Boiler Feed Pump▪ works with a motor. HP Heater
Condenser▪ A shell and tube type
surface heat exchanger.▪ Cooling water flows
twice through the tubes.▪ Steam condenses by
giving up heat and is collected at the hot well below.
▪ Maintained at 45˚C and little below atmospheric pressure.
Cooling Towers
▪ The heated cooling water after passing through the condenser, is brought to the cooling towers.
▪ Heat is given out in the atmostphere.
▪ The water is recirculated back as cooling water.
Ash Handling Plant
▪ Ash is categorised into :– Bottom Ash▪ collected at the bottom of the boiler
– Fly Ash▪ collected at the Electro-Static
Precipitator
▪ It is transported in the form of slurry
▪ Ash is either given away to cement factories, or is stored in Ash dykes.
Control and Automation
▪ Highly Automated by use of PLC controllers
▪ Control Rooms :– Boiler Control Room– CHP Control Room– Switchyard Control Room
Conclusion▪ The practical experience I have gathered during the
overview training of this thermal power plant in two weeks will be very useful as a stepping stone in building bright professional career in future life.
▪ It gave me large spectrum to utilize the theoretical knowledge and to put it into practice.
▪ The trouble shooting activities in operation and decision making in case of crisis made me more confident to work in the industrial atmosphere.
Thank You