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Grate furnaces (stoker firing systems): .... CHEMICAL MECHANISM OF CHAR COMBUSTION. Basic chemical reactions of char combustion : C + O. 2. = CO. 2.
COAL COMBUSTION COMBUSTION AND FUELS
FURNACES OF COAL-FIRED BOILERS Basic boiler furnaces: - grate (steady and moving grates) - fluidized beds (bubble and circulating beds), - pulverized coal-furnace. Others: - cyclone, - retort furnace, - rotary furnace.
COMBUSTION AND FUELS
BASIC COAL FURNACES fumes
coal
b)
drying pyrolysis gasification combustion ash
air
System for coal burning: a) Moving grate, b) Fixed bed, c) Fluidized bed d) Pulverized coal flame
air
secondary air d)
pulverized coal
COMBUSTION AND FUELS
COMBUSTION PROCESS COAL SIZING REQUIREMENTS Grate furnaces (stoker firing systems): • fixed beds: mud, dust, tiny, peas, nut, thick, • moving grate: peas, nut (10-30 mm), Fluidized bed: • bubling
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