Wet flue gas desulfurization method

Abstract

The invention discloses a wet flue gas desulfurization method. The wet flue gas desulfurization method comprises the following steps: enabling original flue gas to enter into from the lower part of a spraying absorption tower, enabling the original flue gas to be in reverse contact with an absorption liquid from bottom to top, so that SO2 in the flue gas is adsorbed by the absorption liquid, and finally discharging pure flue gas from the upper part of the tower; when the desulphurization efficiency is reduced, discharging the absorption liquid from the bottom of the spraying absorption tower, and entering into an absorption liquid regeneration system; in the absorption liquid regeneration system, firstly using an alkaline liquid to neutralize the absorption liquid, then concentrating and crystallizing, then carrying out centrifugal separation to obtain a regenerated ion liquid and an ammonium sulfate byproduct; enabling the regenerated ion liquid to enter the spraying absorption tower for cyclic utilization, wherein the absorption liquid is an ion liquid water solution. The method disclosed by the invention has the advantages of high removal efficiency and low removal cost of pollutants, relatively simple technological process and byproduct resource utilization, and has wide application prospects in the field of fire coal flue gas purification.

Description

technical field [0001] The invention belongs to the field of atmospheric pollutant control, and in particular relates to a method for wet flue gas desulfurization. Background technique [0002] SO 2 It is one of the main air pollutants emitted by coal-fired boilers, which poses a huge threat to human health and the ecological environment. Desulfurization of coal-fired flue gas has always been the focus of air pollution control. At present, there are more than one hundred methods of flue gas desulfurization, the common ones are limestone-gypsum method, ammonia method, double alkali method and so on. The above-mentioned methods have high desulfurization efficiency and mature technology, but they all have disadvantages such as high investment and operation costs, large floor area, and difficult resource utilization of products. Therefore, there is an urgent need to develop new flue gas desulfurization technologies. [0003] Ionic liquid desulfurization is a new flue gas des...

AI Technical Summary

Problems solved by technology

Although ionic liquid desulfurization can achieve high desulfurization efficiency, and the desulfurization products can also be used as resources, but there are the following problems: the absorption liquid is limited to ionic liquids with low viscosity; the regeneration of ionic liquids requires a high temperature and decompression process, which consumes a lot of energy. ; parsed SO 2 The resource utilization of desulfurization products can only be achieved through complex acid (or sulfur) production processes

[0004] The above problems greatly limit the engineering application of ionic liquid desulfurization technology, so it is particularly necessary and important to develop a new ionic liquid desulfurization process

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