Preparation method for mixed desulfurizing agent for circulating fluidized bed boiler

Abstract

The invention discloses a preparation method for a mixed desulfurizing agent for a circulating fluidized bed boiler, and relates to a desulfurizing technology in the circulating fluidized bed boiler. The preparation method solves the problems of low utilization rate of conventional limestone flour serving as a desulfurizing agent, high equipment loss and high power consumption. The preparation method comprises the technical steps of (1) conveying limestone fine-powder materials into a limestone powder bin; (2) stirring the limestone fine-powder materials by a star wheel feeder and a differential turbine so as to enable the limestone fine-powder materials to fall to a coal slime conveying belt; (3) adding coal slime into the conveying belt so as to be mixed with the limestone fine-powder materials; (4) stirring the coal slime and the limestone fine-powder material mixture in a double-shaft stirring machine, and then conveying to a briquette forming machine; (5) pressing the stirred coal slime and limestone fine-powder material mixture to form the spherical mixed desulfurizing agent; and (6) conveying the spherical mixed desulfurizing agent into a finished product bin for later use through a mixed desulfurizing agent conveying belt. The mixed desulfurizing agent prepared by the preparation method is used for realizing desulfurization in the circulating fluidized bed boiler and has the advantages of simple system, low investment, high desulfurizing agent utilization rate, low equipment loss and low power consumption.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation process of a mixed desulfurizer used in a circulating fluidized bed boiler. Background technique [0002] At present, due to the influence of many factors such as operating bed temperature, calcium-sulfur ratio, desulfurization agent reactivity, and limestone desulfurizer particle size, it is difficult to control the desulfurization efficiency in the furnace to reach the design value. Therefore, the circulating fluidized bed boiler The unit generally adopts a composite desulfurization method combining furnace desulfurization and tail flue gas desulfurization to carry out overall desulfurization of the boiler, so that the SO2 emission concentration produced in the flue gas meets the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB 13223-2011 ) requirements. [0003] At present, in the traditional coal slime system of ci...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a method for preparing a mixed desulfurizer for circulating fluidized bed boilers, to solve the problem of using limestone powder as a desulfurizer for desulfurization in the furnace, not only the low utilization rate of limestone powder , and increases the burden on the bag filter, increasing the technical problems of wear and tear on the tail equipment

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