Fume eject-calcium desulfurizing techinique in pulverized coal fired boiler

Abstract

The invention relates to a desulphurization process of limestone injection into a furnace for a pulverized coal boiler. The desulphurization process is characterized in that desulphurization agent powder with the particle size of 100 to 800 meshes is injected into the furnace from a horizontal flue behind a first-stage steam superheater of the boiler, the desulphurization reaction is carried out in the flue for desulphurization, and the desulphurization agent is limestone powder, lime powder or hydrated lime powder. A device of the invention is simple and has no change of the internal structures of the boiler or the impacts on the operation of the boiler according to normal indicators. The desulphurization efficiency is high, the investment is low, the operation cost is low and the ideal target of low-cost desulphurization is realized, thereby achieving the perfect combination of economic benefits and social effects of environmental protection and emission reduction, and having great popularization value.

Description

Calcium Injection Desulfurization Process of Flue Gas in Pulverized Coal Boiler technical field The invention belongs to a flue gas desulfurization process in a boiler furnace, in particular to a calcium spraying desulfurization process for flue gas in a pulverized coal boiler furnace. Background technique In various types of thermal power plants in my country, almost all boilers use coal as fuel. Because coal contains ash and mineral sulfur, the combustion process will produce pollutants such as smoke, SO2 and NOX. For pulverized coal boilers, the process of spraying lime powder or milk of lime outside the furnace is currently used for desulfurization. This kind of process has serious problems of large investment, high operating cost and secondary pollution of by-product gypsum. Studies have shown that the critical temperature of the reaction of CaO and SO2 to form CaSO4 is 850°C. When it exceeds 850°C, the reaction will proceed in the opposite direction, that is, in t...

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Problems solved by technology

This process has serious problems of large investment, high operating cost and secondary pollution of by-product gypsum

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