Device and method for wet-process deacidification

Abstract

The invention provides a device and method for wet-process deacidification, and is used for an incineration flue gas cleaning technology. The device comprises a first washing tower and a second washing tower which are communicated by a pipeline. A flue gas after dedusting firstly passes through the first washing tower and enters the second washing tower. The first washing tower internally comprises circulating water. The second washing tower internally comprises circulating saturated Na2CO3 solution. The first washing tower is connected with a sewage treatment device or a waste chemical treatment and production device. After the circulating water in the first washing tower absorbs HCl in the flue gas, a hydrochloric acid is produced. The hydrochloric acid is flowed to the sewage treatmentdevice or the waste chemical treatment and production device, and used for adjusting a pH of solution in the sewage treatment device or the waste chemical treatment and production device. The bottom of the second washing tower is connected with a precipitate centrifugal separation device. The saturated Na2CO3 solution reacts with an acid gas in the flue gas so as to generate salt, and the salt isseparated out in a solid state by the precipitate centrifugal separation device.

Description

technical field [0001] The invention relates to the field of flue gas purification treatment, in particular to an efficient and economical wet deacidification equipment and method. Background technique [0002] In recent years, with the rapid development of the environmental protection industry, many companies are actively entering the field of hazardous solid waste disposal. At present, my country's hazardous solid waste is mainly disposed of by incineration technology. As the country's environmental supervision becomes more and more strict, the incineration process It is particularly important to meet the emission standards of flue gas. Generally, hazardous solid waste materials have high content of Cl and S elements, and these elements produce a large amount of HCl and SO in the incineration process. 2 Equal acidity and wet deacidification for HCl and SO in flue gas 2 Such acid gases have a high removal efficiency, but the traditional wet deacidification process will inev...

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Problems solved by technology

[0002] In recent years, with the rapid development of the environmental protection industry, many companies are actively entering the field of hazardous solid waste disposal. At present, my country's hazardous solid waste is mainly disposed of by incineration technology. As the country's environmental supervision becomes more and more strict, the incineration process It is particularly important to meet the emission standards of flue gas. Generally, hazardous solid waste materials have high content of Cl and S elements, and these elements produce a large amount of HCl and SO in the incineration process. 2 Equal acidity and wet deacidification for HCl and SO in flue gas 2 Such acid gases have a high removal efficiency, but the traditional wet deacidification process will inevitably produce a large amount of saline wastewater that needs to be treated. The treatment cost and equipment investment of this part of the saline wastewater are in the operation of hazardous waste and equipment investment For this reason, if the generation of saline wastewater can be avoided in the wet deacidification process, the operating cost of hazardous waste disposal will be greatly reduced and the investment in equipment will be reduced to a certain extent.

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