On the combustion issues in boiling furnaces
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Boiling furnaces use finer coal for combustion, which results in high combustion efficiency. Under normal circumstances, is some of the exhaust gas recirculated back into the furnace chamber to control its temperature? Will this lead to more cold air entering the furnace during combustion? This post was last edited by zhyl1129 on 2009-4-2 10:15.]
When using flue gas recirculation, there is usually a certain proportion involved, and it is also necessary to calculate the flow rates of various components after flue gas recirculation.
I have not had in-depth experience with fluidized bed boilers, but it is certain that they boast high thermal efficiency. The large contact area between air and coal powder ensures complete combustion, and they are suitable for a wide range of coal qualities. Flue gas recirculation can reduce the furnace temperature and decrease the formation of NOX. A boiling furnace should be a pressurized furnace; cold air shouldn’t leak in, and instead, it’s necessary to prevent smoke from escaping.
The temperature in the furnace of a fluidized bed furnace is around 900 degrees; the particles burn while being in a fluidized state inside the furnace. An air preheater is installed at the rear, so the air that enters the furnace is hot air, and therefore there is no need for flue gas recirculation. If the furnace walls are airtight, no cold air will be able to enter.