boiler & aux operation

8/13/2019 Boiler & Aux Operation

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POWER PLANTOPERATIONBOILERAUXILIARIES

16 February 2014 PMI Revision 00 1


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Presentation outline


OPERATING PROCEDURE

APH

ID, FD AND PA FAN

FURNACE PURGE

BOILER LIGHT UP

MILLING SYSTEM


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Before starting anyquipm ntENSURE

No PTW is pending on the equipment

which is to be normalized .

Equipment is properly boxed up and no

maintenance staff working.

Local operator is informed before the

equipment is started.



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Pre start checksbefore light up



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Equipment cooling water is charged in boiler side andproper venting is done.

Service water /filter water for sealing in the boiler bottom

is charged .Get the clearance from AHP for sealing of

bottom hopper.

Service and instrument air is charged and air for SADC

and burner tilt are charged .

Fire water/ sprinkler water is available in boiler area.

Before Light up


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DM water is available .

Ensure the availability of aux. steam .

Ensure 6.6 kv, 415 volt , 220 volt DC,110

V AC, 24 V DC SUPPLIES are normal .Ensure that all MCC s are charged. Both

buses are charged independently and Bus

coupler is in OFF position .ensure all

chargers are in charged condition and all

the batteries are in healthy condition .

All unit protections/interlocks ( boiler

,turbine & generator ) are checked and

recorded in the protection register .


Before Light up


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Start LDO PUMP or charge LDO line upto firing floor if

other units are running.

Start HFO pump or charge charge HFO line upto firing

floor on long recirculation if other unit is running. also inform

other units .

charge atomising air and atomising steam lines.

Keep boiler drum vents,SH vents , SH drains ,CRH drains,

HRH drains open.

Ensure all low point drains are closed .

Before Light up

t


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Inform shift chemist to take water

sample before water filling in the boiler

and take clearance from shift chemist.

Inform him to prepare hydrazine ,

ammonia and phosphate solution for

dosing . Check availability of all LP and HP

dozing pumps .

Fill water in the boiler upto normal levelby running one BFP .

Ensure at least two ESP passes are clear

and their inlet / outlet gates are open.Elect. Supply of fields are kept off .

Inspect the boiler up to drum floor .

Ensure that all manholes /peepholes are

closed.


e ore g t up


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Before Light up

Ensure start up vent and ECOrecirculation valve are open.

Charge the SCAPH LINE .

Keep the burner tilt at 0 deg ( horizontal )

Ensure boiler and auxiliaries areas are

clean , safe and properly illuminated .



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A

B

C

D

E

F

ESP

PASS A

ID-A

ID-B

PA-B FD-B

PA-A FD-A

FURNACE

WIND BOX

SCAPH

SA

PAFG

SA

PA

FG

SCAPH

ESP

PASS B

ESP

PASS C

ESP

PASS D

WIND BOX

ESP

I/LX

O

VER

DUCT

ESPO/LX

O

VER

DUCT

SA

X-OVER

DUCT

COLD PA

HOT PA

FLUE GAS

COLD SA

HOT SA

CHIMNEY

FLUE GAS & AIR PATH

APH

APH

MILL

27C

324C

320C

1165C

ECO I/L 493C351C

136C

134C

129C

126C


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AIR PRE-HEATER OPERATION

PRE START CHECKS

Support bearing/ guide bearing lub oilpumps RUNNING and lub oil coolers are

CHARGED.

Bearing temperature NOT HIGH (less than60oC)

Electrical supply to APH motor isAVAILABLE.

Local operation - Isolating valves of air

motors are 'OPEN' and bypass valves ofair motor solenoids are 'CLOSED'.

'Air motors' lub oil level ADEQUATE

Service air pressure is ADEQUATE (> 5

Kg/cm2)



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APH STARTING PROCEDURE

WHEN BOTH APHS ARE OFF

START air motor of APH.

Air motors ON indications come on

Isolating dampers of APHs start opening.INSTRUCT local operator to check, locally

for any abnormal sounds from

bearings/seals.

START air heater electrical motor.Breaker CLOSED & its indication comes

on UCB

Associated air motor stops.

Starting current shoots up and comes

down to normal load current.




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Isolating dampers of the air heater remain open.

Isolating dampers of the other air heater, not in service, startclosing if its air motor is not ON.

INSTRUCT local operator to check, locally for any abnormal

sounds from bearings/seals.

There should be no abnormal hunting in air heater amperesmeter readings.

There should be no abnormal sounds from air pre-heater

seals or bearings.

Bearing temperatures must be within the normal range (650C -75 0C)


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SHUT DOWN PROCEDURE

CHECK Corresponding ID & FD Fans arerunning.

UNLOAD associated ID/FD fans, gradually.The other pair of ID/FD fans (if running)starts loading up on auto.

STOP the associated FD fan. Maintaindesired oxygen percentage.

Furnace total airflow indication dropsslightly. Reduce firing if required.



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FURNACE

PRIMERY AIR HEATER

SECONDRY AIR HEATERMILLS

FD FAN A

PA FAN BPA FAN A

FD FAN B

ESP

ID FAN A

ID FAN B

CHIMNEY

Atmospheric air

Atmospheric air


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ID FAN OPERATION

PRE START CHECKS

WHEN BOTH THE FANS ARE OFF

Fan lub oil pressure is ADEQUATE (1.2Kg/cm2).

Fan bearing temperature is NOT HIGH (

boiler & aux operation

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