Circulating fluidized bed technology

Circulating fluidized bed combustion technology is a clean coal combustion technology developed in the past two decades. It has the outstanding advantages of wide fuel adaptability, high combustion efficiency, low nitrogen oxide emission, low-cost limestone furnace desulfurization, large load regulation ratio and fast load adjustment.
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Circulating fluidized bed combustion technology

Circulating bed boilers are widely used worldwide, and large-capacity circulating bed boilers have been accepted by the power generation industry. Circulating fluidized bed realizes the strict pollution emission index at low cost and burns inferior fuel at the same time. It has comprehensive advantages in terms of load adaptability and comprehensive utilization of ash residues, and provides an effective way for energy-saving and environmental protection transformation of pulverized coal furnace. Circulating fluidized bed combustion technology has a high combustion rate, especially for coarse-grain fuels; most of the unburned fuel is recycled to the furnace, so its combustion efficiency can be comparable to that of pulverized coal furnaces, usually reaching 97.5% to 99.5%. .
 

Circulating fluidized bed boiler desulfurization is an in-furnace combustion desulfurization process. Limestone is used as desulfurizing absorbent. Coal and limestone are fed from the bottom of the combustion chamber of the boiler. The primary air is fed from the lower part of the air distribution plate and the secondary air from the combustion chamber. The middle enters. Limestone is thermally decomposed into calcium oxide and carbon dioxide. The gas flow causes the coal and lime particles to be strongly disturbed in the combustion chamber to form a fluidized bed. The SO2 in the coal-fired flue gas undergoes a chemical reaction in contact with the calcium oxide and is removed. In order to increase the utilization of absorbents, unreacted calcium oxide, desulfurized products and fly ash are returned to the combustion chamber for recycling.

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