Desulfurization process for burning of mixing coal slime mixed with dolomite

Abstract

The invention discloses a desulfurization process for burning of coal slime mixed with dolomite. The process solves the problems that a present circulating fluidize beds has high desulfurization cost, unstable desulfurization index, influencing the load capacity of boilers, and the like, and has the advantages of low cost, convenient use, effective improvement of desulfurization efficiency, guarantee of boiler stability, and the like. The process comprises the following steps: (1) mixing coal slime and dolomite into mixed coal slime according to the weight part proportion of 100:(8-12) parts;(2) then uniformly mixing the coal slime and the mixed coal slime in a coal cabin in a mode that the mass percent of the coal slime is larger than 60 percent and then sending an obtained mixture intoa coal feeder; (3) sending the mixture of the coal slime and the mixed coal slime into a hearth by the coal feeder for burning; and (4) recovering burnt coal slag. Flue gas after burning is treated by electric precipitation, then stove ashes are recovered, and the flue gas treated by the electric precipitation is desulfurized after coming out of the hearth and exhausted.

Description

technical field

[0001] The invention relates to a desulfurization combustion process of a circulating fluidized bed boiler, in particular to a coal slime mixed firing dolomite desulfurization process. Background technique

[0002] The circulating fluidized bed boiler is a new type of clean coal-fired boiler developed in the past 30 years. This boiler is widely used because of its good adaptability to coal types, high combustion efficiency, good ash activity, and desulfurization in the furnace. Although the furnace type can achieve desulfurization in the furnace, limestone is used as absorbent to achieve desulfurization in the furnace. The desulfurization index is unstable, which affects the reduction of the boiler combustion load capacity, and is not approved by the environmental protection department. Therefore, the new circulating fluidized bed boiler must be Only the construction of desulfurization equipment outside the furnace can obtain the approval of environmental imp...