Renewable flue gas desulphurization process

Abstract

The invention provides a renewable flue gas desulphurization process. The renewable flue gas desulphurization process comprises an absorption process and a desorption process. In the absorption process, the following steps are sequentially carried out according to the flowing direction of flue gas: absorbing oxysulfide in the flue gas by using a half-lean solution to form a first pregnant solution; further absorbing the oxysulfide in the flue gas by using a lean solution to form a second pregnant solution; catching a desulfuration solution carried in the flue gas by using a detergent; and discharging clean flue gas. The desorption process comprises the following steps of: carrying out first desorption on part of the first pregnant solution to form a half-lean solution and desorption gases; simultaneously carrying out second desorption on part of the first pregnant solution and part of the half-lean solution to form a lean solution and desorption gases; condensing and recycling oxysulfide in the desorption gases; and respectively supplying the other part of the half-lean solution and the lean solution for the absorption process so as to realize the circulation of the desulfuration solution between the absorption process and the desorption process. The renewable flue gas desulphurization process is suitable for processing various oxysulfide-contained flue gases or industrial waste gases.

Description

technical field [0001] The invention relates to the technical fields of chemical industry, thermoelectricity and metallurgy, and more specifically relates to a renewable flue gas desulfurization process. Background technique [0002] Currently, the commercial website of Cansolv Co., Ltd. ( http: / / www.cansolv.com / cn / so2scrubbingschema.ch2 ) discloses a desorbable flue gas desulfurization process. The process first uses amine liquid to absorb sulfur dioxide in the flue gas, and then desorbs the sulfur dioxide in the amine liquid at high temperature to obtain sulfur dioxide gas with higher purity, and at the same time obtain the amine liquid that restores the ability to absorb sulfur dioxide, and the amine liquid can be recycled use. At present, there is also a desulfurization process that can be desorbed by ionic liquid, which is basically similar to the process of the above-mentioned amine desulfurization process. The difference between the two is that the components of...

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Problems solved by technology

[0003] At present, the desulfurization process of the prior art has many deficiencies, mainly as follows: high content of suspended impurities in the desulfurization solution, serious system blockage, low desulfurization rate, high desorption energy consumption, difficult recovery of desulfurization solution, low removal rate of strong acid radicals, etc.

In addition, since the sintering flue gas in the metallurgical industry has the characteristics of large dust content, high content of sulfur trioxide, chlorine, nitrate and other strong acid gases, when using the existing desulfurization process to remove the sintering flue gas When sulfur dioxide gas is present, the above-mentioned deficiencies will be more serious, and there will be further poor resin desalination effect and desulfurization caused by poor resin selectivity and large resin load when the resin is used to remove chlorine and nitrate under the condition of high sulfate content. Defects such as large loss of solution

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