Accident Handling 34: What are the common faults in the positive-pressure ash removal system of circulating fluidized bed boilers?
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What are the common faults in the positive-pressure ash removal system of circulating fluidized bed boilers?
Common faults: 1. Failure to build pressure, with continuous pressure application; 2. Pipe blockage (the filter between the air plug at the bottom of the silo pump and the ash pump becomes clogged; mechanical personnel must be called to remove and clean it); 3. The silo pump does not feed material, as the feeding valve does not function (contact thermal or electrical personnel for assistance); 4. The discharge valve does not function (contact thermal personnel for assistance); 5. The pneumatic solenoid valve does not function; 6. The check valve does not function; 7. Insufficient compressed air pressure, resulting in no operation; 8. Loss of power supply to the silo pump.
Severe water contamination in compressed air causes the feed valve and discharge valve of the silo pump to stick or fail to operate.