Device and method for removing SO3 in coal-fired boiler flue gas by using white mud and red mud

Abstract

The invention discloses a device for removing SO3 in coal-fired boiler flue gas by using white mud and red mud. The device comprises a crusher, wherein the material outlet of the crusher is fixedly connected with an elevator, the material outlet in the top end of the elevator is fixedly connected with the material inlet of a material bin through a pipeline I, the material outlet in the bottom endof the material bin is fixedly connected with the material inlet of a spiral feeder through a pipeline II, the material outlet of the spiral feeder is fixedly connected with the material inlet of a ball mill through a pipeline III, the material outlet of the ball mill is fixedly connected with the material inlet of a grading machine through a pipeline IV, the bottom end of the grading machine is fixedly connected with the material inlet of a spiral returning machine through a pipeline V, and the material outlet of the spiral returning machine is fixedly connected with the material inlet of theball mill through a pipeline VI. According to the invention, the device is scientific and reasonable in structure, cam prepare superfine powder from white mud and red mud, can make white mud fine powder and red mud fine powder fully react with SO3 in flue gas, has good removal effect on SO3 in flue gas, can turn waste white mud and red mud into wealth, substantially reduce the flue gas SO3 removal cost of a coal-fired boiler, and is suitable for application and popularization.

Description

technical field [0001] The invention relates to the removal of SO from coal-fired boiler flue gas 3 The device specifically relates to a method of removing SO from coal-fired boiler flue gas by using white mud and red mud. 3 s installation. Background technique [0002] Power plant coal-fired boiler flue gas contains SO 3 , needs to be removed. At present, the SO in the flue gas of coal-fired boilers 3 The cost of removal is higher, mainly because more alkaline materials are consumed. White mud is the solid waste produced in the alkali recovery process of pulp and paper enterprises, and its main component is CaCO 3 , At present, most of the white mud produced by my country's pulp and paper making enterprises is disposed of in landfills. On the one hand, it occupies land resources, and on the other hand, the cost of landfill disposal is relatively high; red mud is the pollution discharged when the aluminum industry extracts alumina Generally, every ton of alumina produced...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a method for removing SO from coal-fired boiler flue gas by utilizing white mud and red mud. 3 The device and method solve the problem of SO in the existing coal-fired flue gas 3 More alkaline materials are needed for removal, and the cost is relatively high

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