Standard operating procedure of CHP & Dust extraction system

 

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

Read reference books for power plant O&M

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.

 Questions & Answers on Ash handling system

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