The Circulating fluidized bed coal fired boiler contains mainly particles of an inert material, like sand and ash, including particles of SO2 sorbent. The coal content in a fluidized bed is not considerable, it is only from 3 to 5% of the whole mass of the bed.
Type: steam boiler or hot water boiler
Heat Rate: 90%-97%
Application: power plant, Cement
Coal fired circulating fluidized bed boiler technology
Fuel particle size requirements: smaller than13mm
Limestone particle size requirements: smaller than 2mm
Calcium sulfide Ca / S: 1.5 – 2
Desulfurization efficiency: higher than 80%
Suitable the fuel: Lean coal, bituminous coal, anthracite coal, lignite,coal gangue, etc.
Combustion efficiency: higher than 97
CFB boilers are touted for their fuel flexibility. For instance, coal fired CFB boiler can efficiently use fuels such as low rank lignites and sub bituminous coals that typically produce a lot of ash and are difficult to use in other types of pulverized coal boilers. CFB boilers are even being used to remove gob piles in some areas.
Major features of coal fired fluidized bed boilers
•In situ SO2 removal
•Low NOx emission
•Good system availability
•Low corrosion rate
•Easy sizing of fuel