Power plant and calculations: December 2021

SOP FOR CHP START UP

Ensure trained CHP operator & helper are available
Ensure adequate illumination is available
Ensure Operator has walky-talky for proper communication with control room
Have field round on entire CHP & ensure all conveyors are empty & no any foreign materials on belt.
Ensure no any maintenance or inspections are going on by other department
Ensure all interlocks & local hooters are healthy
Ensure shuttle conveyor discharge chute is at required position to discharge the coal
Ensure Coal crusher twin gate is opening is as per our requirement
Give clearance to control room for starting CHP
Initially start Dust extraction system
Then follow the starting sequence of shuttle conveyor & then preceding all conveyors as per system interlocks
Ensure OBMS & magnetic separator are inline
After ensuring all the coal handling system is healthy, then fill the grizzly hopper & start vibro-feeder (Do not start vibro-feeders if hopper is empty)
If coal is dusty, keep ON water sprinklers
Ensure coal belt weight is within limit by frequently communicating with control room
During CHP running, have the field rounds for running inspections like coal spillage, gear box/motor abnormal sounds etc

SOP FOR CHP SHUTDOWN

Ensure coal bunker is 90%
Stop coal feeding
Keep OFF water sprinkler system
Ensure coal belt conveyors are empty & there is no any coal on belts, vibro screen & crusher
Stop CHP as per sequence & wait for 10 minutes then stop dust extraction system
Have field round & ensure no any coal saturation & no any abnormal observations
Carryout house keeping
Note down abnormalities observed during operation & take into the shift in charges & maintenance team

SOP Dust Extraction system

Pre checks:

Ensure, operators supervising the DE system & coal handling are well trained
Ensure proper communication of operator with control room
Ensure coal handling, coal feeding system & DE systems are free from coal & other foreign materials Ensure there is a proper housekeeping near coal crusher, vibro screen & DE system
Ensure all interlocks & protections systems of conveyors are healthy
Ensure sprinklers systems provided on coal belt conveyors are healthy & can be used on immediate use Ensure coal dust collecting pipes are jam free i,e free from large size coal particles
Ensure temperature gauge fitted at DE silo is showing normal temperature

Start up Operation:

Start coal belt conveyors as per SOP, initially conveyors after DE systems shall be started first
Then start RAV & vibrators, ensure both are working normal
Then start air compressor & ensure bag filters purging SOVs are operating sequentially with preset operating & cycle time
Start air blower & adjust suction damper, initially suction damper is kept 50% to avoid the sucking of larger sized coal particles
Then set individual dust suction dampers of dust collecting pipes from crusher, vibro screen, and conveyor to 30-50% maximum.
After coal feeding, check the dust expelling from chimney, if it is more, then control the blower inlet damper.
Allow to stabilize the system Operation checks:
Ensure RAV is running continuously
Ensure electromagnetic vibrator fitted on bag filter housing hopper is working as per timer set
Ensure bag filter housing temperature is normal

Pre Shutdown & shutdown checks / activities:

After shutdown of DE system following safety checks & activities to be carried out
After stopping the coal feeding, keep ‘ON’ DE system for at least 10-15 minutes to ensure bag filters & housing are free from dust & coal particles
After ensure there is no more coal falling from RAV & no dust in chimney shutdown the system safely after shutdown, ensure the dust collecting pipes are jam free
Carryout the water washing of coal crusher house & coal belts (near crusher & DE system)
During shutdown have a routine field rounds over crusher house, DE system & ensure temperature inside the bag filter housing is normal.

Power plant and calculations