Compressor Protection & Drier

8/4/2019 Compressor Protection & Drier

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Air compressor protections

&

Air Drier Operation


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COMPRESSOR

MAKE KIRLOSKAR

FREE AIR DELIVERY 28.91 M3/MIN (1734.6 M3/Hr)

PRESSURE 8.8 KSC

SPEED 710 RPM

MOTOR

MAKE CROMPTON GREAVES

POWER 200 KW

VOLTAGE / CURRENT 6600 V / 22 A

SPEED 1480 RPM


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PROTECTIONS

SL.No.

DESCRIPTION VALUE UNITNORMAL SET RESET

1 HP DISCH TEMP HIGH 160 170 160 DEG C

2 LP DISCH TEMP HIGH 150 160 150 DEG C

3 LUBE OIL TEMP HIGH 80 85 80 DEG C

4 LP CW O/L TEMP HIGH 50 55 50 DEG C

5 AFT COOLER AIR O/L TEMP HI 55 60 55 DEG C

6 AUTO START / STOP 8.0 10 8.0 KSC

7 0-100 % LOAD / UNLOAD 8.0 6.5 8.0 KSC

8 AIR RECIEVER PRESSURE LOW 8.0 5.0 8.0 KSC

9 AIR RECIEVER PRESSURE HIGH 8.0 10.5 8.0 KSC

10 ACW I/L PRESSURE LOW ALARM 3.5 2.8 2.5 KSC

11 LUBE OIL PRESSURE LOW 2.5 1.8 3.0 KSC

Air compressor Motor winding temp. High Alarm = 110 Deg C

Air compressor Motor DE/NDE temp. High- Alarm = 75 Deg C


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BLOWER

HEATER

3 Way valve

Pre-Filter

After-Filter

R

e-press.vlv

FR

OMD

RIER-B

Fromcompressor

TOWER-I TOWER-II

TOWER-1

DRYING

TOWER-II

REGENERATION


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Filters

Pre Filter

Protect the desiccant from free water contamination,dust, scales, etc.,

Material: Poly-propylene cartridge with 5 micron size.

After filter

To remove the desiccant dust carried over to the

equipment.

Material: Poly-propylene cartridge with 5 micron size.


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FEATURES:

Both Auto & Manual operation.

Auto cum Manual drain valves for Each pre-filter

and after filter. (Operates on every 5 Min)

Overall pressure drop across the equipment is 0.2 kg/cm2

Air through heater can be heated up to 150 Deg C.

(Desiccant measuring Temp. switches (TS1, TS2 & TS3)set at 100 to 120 Deg C will trip while temp. exceeds).


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The Compressed Air contains dust, oil water vapour,

hydrocarbon with typical burnt smell. It has to be purified

before use of important pneumatic valves, cylinders and

pressurised air appliances.

Activated Alumina is used as desiccant which is porous form of

Aluminium dioxide.

Non-toxic and will not swell in contact with Liquid. Capable of producing dew point up to -80 deg C (Under

Specified conditions).

DESICCANT PROPERTY:


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Regneratable employing temperature: 120 150 Deg C

Stable up to the max. temperature of 350 Deg C without

Any reduction in properties.

Capable of being reactivated for almost unlimited number

Of times.

TECHNICAL SPECIFICATIONS:

Size : 5 to 8 mm

Bulk density : 0.75 - 0.85 gms/lit

Absorption capacity (at 60% RH) : 21.5%


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HEATER

Rating : 36 KW

BLOWER

Rating : 7.5 HP, 2880 rpm

Capacity : 800 m3/Hr

Pressure : 28mm of Hg

AIR INLET CONDITION:

Rated flow rate : 1880 m

3

/HrInlet pressure : 8.8 kg/cm2

Inlet temperature : 45 Deg C

RH : 100%

AIR OUTLET CONDITION:

Rate flow rate : 1880 m3/HrOutlet pressure : 8.6 kg/cm2

Outlet Temp : 45 Deg C

Dew point (Atm) : -40 Deg C


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The dew point is the temperature to which a given volume of

air must be cooled, at constant barometric pressure, for water

vapor to condense in to water. The condensed water is called

dew. The dew point is a saturation point.


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Higher Dewpoint means that its 100% approaches to Relative

Humidity (Air is saturated with water).

Formula for Dew point calculation:


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TROUBLE SHOOTING

Problems Cause Solution

Excessive Pressure Drop

Filter elements gets

saturated.

Desiccant is

contaminated / saturated.

Check and Replace (if

necessary)

Poor Dew point

Inlet Flow rate is high

Inlet pressure is less

Filters get saturated

Run according to rated

parameters

Check and Replace (if

necessary)Excessive air going to

exhaust and pressure in

both towers are equal

Main valve

malfunctioning.

Check valve defection

Re-assemble it.

Re-assemble it.

Change over failure (3way valve)

No pilot air for control

valveAir exhausts in SOV

Air leakage in the

Actuator

Check SOV operationReplace (if necessary)

Replace vane O Ring.

Moisture at the outlet of

the drier

Cycle failure

Not draining filters

properly

Check timer

Check filter Auto drain.


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DRIER OPERATION (Drying cycle- 6 Hrs)

DRIER TOWER -1 START

----5 th Min-------Exhaust -2 valve open.

----8 th Min------- Blower start.

----11 th Min------- Heater ON.

----After 31/2 Hrs-------Heater OFF.

----After 51/2 Hrs-------Blower STOP and Exhaust valve-2 get

close after 3 Min.

Re-pressurisation for 25 Mins.

DRIER-2 in service and Exhaust -1 valve in open.


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OBSERVATIONS

1) Drop in temperature in instrument air line (45Deg C @dryerO/L and 28 Deg C@ Boiler inlet {Leads to rise in moisture

content}

2) Leakages in Boiler instrument air lines (Isolation valves are

Already provided to attend all leakages in ONLINE or Can be

Replaced with new lines)

- Energy savings can be made.

3) Motor winding temp & Bearing temp values can be extended toDCS & 2 / 6 on winding temp logic to be confirmed.

4)Air line for compressor valves can be tapped from header TOP,

Instead of sideways


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Compressor Protection & Drier

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