ash handling sudeep
TRANSCRIPT
ASH HANDLING SYSTEMS
BySudeepEEPL
ASH HANDLING
• Method of collection, conveying, interim storage and load out of various types of ash residue
• The most common types of ash include bottom ash (30-40% in FBC) and fly ash (60-70% in FBC) resulting from the combustion
BOTTOM ASH HANDLING
BOTTOM ASH HANDLING SYSTEMS
WATER IMPOUNDED
HOPPER
SUBMERGED SCRAPER
CONVEYORDRY BOTTOM ASH
SYSTEMS
WET DISPOSAL WET DISPOSAL DRY COLLECTION
WATER IMPOUNDED HOPPER
• Very old process and huge amount of water is consumed
• The hopper system receives, quenches, stores crushes and remove bottom ash using hydraulic means
• Ash is discharged once in 6 to 8 hours and hence all the equipment must be designed for 6 to 8 times
WATER IMPOUNDED HOPPER
RECIRCULATION SYSTEM
RECIRCULATION SYSTEM
BOTTOM ASH HANDLING-SSC
1`
SUBMERGED SCRAPER CONVEYOR
• Water submerged drag chain conveyor is placed beneath the furnace
• The wet slurry is taken up to a de-watering slope before discharging to conveyors or silos
• Water serves as cooling medium hence safe disposal and increased life of the conveyor
• Water also acts as airlock for ash hoppers to avoid air to enter the furnace
ADVANTAGES OF SSC
• Reduced water usage• Reduced power consumption• Reduced operational and maintenance cost
PARTS USED IN BOTTOM ASH HANDLING
Submerged scraper conveyor Ash clinker grinder
Dry bottom ash handling
• Water is not used and ash is transferred in dry condition
• Increased boiler efficiency achieved and reduces impurities in stack
• Low maintenance cost and no water required
Dry bottom ash handling
ADVANTAGES OF DRY HANDLING OVER SSC
FLY-ASH HANDLING
FLY-ASH HANDLING
FLY ASH SYSTEMS
PRESSURE CONVEYING SYSTEM
DENSE PHASE
DILUTE PHASE
VACUUME SYSTEM
DILUTE PHASE
PRESSURE SYSTEM
OPERATING PRESSURE IS 5 Kg/cm2
VACUUM SYSTEM
OPERATING PRESSURE IS 530mm
COMBINED PRESSURE AND VACUUM SYSTEM
Comparison of vacuum and pressure systems