25-03-2011, 09:58 AM
PRESENTED BY:
MURALI KRISHNAN.M
FB PPT.ppt (Size: 513.5 KB / Downloads: 191)
FLUIDIZED BED GASIFICATION
INTRODUCTION
GASIFICATION
FLUIDIZED BED?
GRANULAR SAND LIKEMATERIAL+FUEL IS FLUIDIZED BY UPWARD PASSAGE OF AIR
MOST SUITABLE METHOD FOR GASIFICATION OF COAL AND OTHER FUELS & BIOMASS
FLUIDIZED BED TECHNOLOGY
FUEL IS FED IN TO THE SAND BED (PRE HEATED-1200 deg F)
AIR IS FORCED THROUGH BOTTOM
SAND BED TAKES ON A FLUID LIKE CHARACTER
BED IS VIOLENTLY MIXED&AGITATED
TEMP-1400-1700 deg F
THIS IS FLUIDIZED BED
FLUIDIZATION?
THE FLUIDIZATION OCCURS WHEN THE DRAG FORCE ON THE PARTICLES IN THE BED DUE TO THE UPWARD FLOWING GAS JUST EQUALS THE WEIGHT OF THE BED
TYPES
BUBBLING FB-:
LOW FLUIDIZATION VELOCITY
70-90% OF SULPHUR REMOVEL
CIRCULATING FB-:
HIGH VELOCITY
90-95% OF SULPHUR REMOVEL FROM COAL
FLUIDIZED BED COMBUSTION
COMBUSTION TECHNOLOGY USED IN POWER PLANTS.
FLUIDIZED BEDS SUSPEND SOLID FUELS ON UPWARD-BLOWING JETS OF AIR DURING THE COMBUSTION PROCESS.
TUBULENT MIXING OF GAS&SOLID FUELS
THUMBLING ACTION PROVIDES MORE EFFECTIVE CHEMICAL REACTION &HEAT TRANSFER
TYPES OF FBC
FBC
PFBC
ADVANCED PFBC
GFBCC (GASIFICATION FLUIDIZED
BED COMBUSTION COMBINED CYCLE)
CHIPPS (COMBUSTION BASED HIGH
PERFORMANCE POWER SYSTEM)
FLUIDIZED BED GASIFICATION
COAL OR SOLID/LIQUID WASTES ARE
INJECTED IN TO THE BED
AIR IS FORCED UPWARDS THROUGH NOZZLES
FLUIDIZATION OCCURS WHEN,DRAG FORCE ON THE SAND
BED DUE TO FORCED AIR = WEIGHT OF THE BED
TUBULENT MIXING OF PARTICLE (SAND+FUEL+AIR)
THUMBLING ACTION PROVIDES MORE EFFECTIVE CHEMICAL
REACTION&HEAT TRANSFER
FUELS QUICKLY DECOMPOSED TO FLUE GASES (COMBUSTIBLE GAS)
LARGE ASH PARTICLE ARE REMOVED BY PRECLEANER
AFTER CLEANING FLUE GAS IS USED FOR POWER GENERATION
Ex: STEAM TURBINE,GAS TURBINE etc…