Discuss what effects increasing the secondary air volume will have on the combustion in a circulating fluidized bed boiler?
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Discuss what effects increasing the secondary air volume will have on the combustion in a circulating fluidized bed boiler?
Increasing the amount of secondary air raises the oxygen level in the dilute-phase region of the furnace; it also enhances turbulence, allowing the particles in that region to mix more effectively with the air and thus strengthening combustion there. Since the heat from the bed does not reach the upper part of the furnace, the bed will descend.
The bed temperature may decrease, and there is a certain reduction in NOx emissions
1. The oxygen level has increased, and the combustion efficiency of the fuel fed into the furnace has improved. 2. Increase the amount of ash in the external circulation. 3. The bed temperature will decrease to a certain extent.