A kind of desulfurization absorbent and its preparation method and application

Abstract

The invention discloses a desulfurization absorbent and a preparation method thereof. 1 part of digestion process water is added to the digester, stirred and digested to obtain a digested product; 2) drying the obtained digested product to obtain a high-performance desulfurization absorbent. The water-retaining agent is an organic compound containing at least one water-retaining functional group, including one or more of cellulose ether, cellulose ether derivatives, lignin and lignin derivatives; the cell agent has a boiling point≤100 ℃ of organic compounds. In the present invention, the specific surface area of ​​the prepared desulfurization absorbent can reach 30m by adding water-retaining agent and cell agent to carry out lime digestion and modification. 2 / g or more, the pore volume can reach 0.2cm 3 / g or more, the BJH pore diameter is concentrated at 5-20nm.

Description

technical field [0001] The invention belongs to the field of flue gas desulfurization, in particular to a desulfurization absorbent and its preparation method and application. Background technique [0002] At present, the circulating fluidized bed flue gas desulfurization process mainly uses dry slaked lime powder as the desulfurization absorbent. During the desulfurization process, the slaked lime powder absorbs water in the atomized water area to form a water film, and the SO 2 After dissolving in the water film, it reacts with slaked lime, and then the water film is evaporated by the high-temperature flue gas, and then enters the dust collector at the back end of the absorption tower, and the collected slaked lime powder enters the absorption tower again, and so on. At present, there are two main sources of slaked lime powder: one is to directly purchase slaked lime powder that meets the requirements, and the other is to purchase quick lime powder that meets the requirem...

AI Technical Summary

Problems solved by technology

However, compared with the lime industry in developed countries in Europe and the United States (such as Canada, Belgium, Italy, the United States, etc.), the development of China's lime industry generally presents the characteristics of "small, scattered, and chaotic" and lacks an overall management and regulation mechanism

Especially for the emerging flue gas desulfurization market, lime products have been "caught off the shelves", and there is no systematic development of high-efficiency lime products for desulfurization. Most of the desulfurization lime products for desulfurization have low desulfurization activity. In order to meet the national emission targets, enterprises must It often wins by quantity, and invests a large amount of desulfurizer, resulting in waste of resources, increasing operating costs and by-product emissions

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