A kind of vacuum potassium carbonate desulfurization process method and equipment

Abstract

The invention relates to the technology of coke oven gas purification, and discloses an optimized process for vacuum desulfurization of potash. The process comprises the following steps: a potash barren solution coming out from the bottom of a regeneration tower is divided into two parts to be sent to the alkaline cleaning section and the desulfurization section of a desulfurization tower respectively, and then the potash barren solution conveyed to the alkaline cleaning section of the desulfurization tower undergoes buffering by an alkali tank; a KOH water solution is continuously added into the pipeline between the outlet of the alkali tank and the inlet of the alkaline cleaning section of the desulfurization tower to be mixed with the potash barren solution in the pipeline to be conveyed to the alkaline cleaning section of the desulfurization tower for spraying and absorption of H2S; a scrub solution after absorbing H2S and potash rich liquid flowing out from the lower part of the desulfurization section of the desulfurization tower are collected by a rich liquid tank and then conveyed to the top of the regeneration tower for vacuum resolution and regeneration to repeat the cycle. With the process and the device, the alkali consumption amount is remarkably reduced and the cost is reduced upon the premise of guaranteeing the quality of the barren solution going into the alkaline cleaning section, and the generation amount of a desulfurization waste liquid is reduced by 80 percent above.

Description

technical field [0001] The invention relates to coke oven gas purification technology, in particular to a vacuum potassium carbonate desulfurization process optimization method and equipment. Background technique [0002] Vacuum potassium carbonate desulfurization is a widely used wet desulfurization process developed by Anshan Jiao Nai Institute. Because of its high desulfurization efficiency, in addition to Wuhan Iron and Steel Coking Company, there are coking plants in Angang New District (Bayuquan), Baosteel Meishan Coking Plant, Shaogang Coking Plant, Handan Iron and Steel New District and other coking plants in China. Although the vacuum potassium carbonate desulfurization process of each coking plant The operation conditions are not the same, but they all face problems such as high alkali consumption for gas purification and difficult treatment of desulfurization waste liquid. The process uses potassium carbonate solution to directly absorb H in coke oven gas 2 Acid...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of high alkali consumption and large pollutant discharge in the existing vacuum potassium carbonate desulfurization process, optimize the process technology of the vacuum potassium carbonate desulfurization process according to the concept of process cleaning, and use the strong alkaline barren solution produced by the system The more reasonable and optimized design of the NaOH replacement scheme can not only reduce the NaOH alkali consumption of the system, completely reduce the desulfurization waste liquid discharged from the alkali washing section, but also stabilize the H in the gas after the tower. 2 S concentration, improve the desulfurization efficiency of the system

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