Combined adsorbent for flue gas desulfurization and denitrification and flue gas desulfurization and denitrification method

Abstract

The invention relates to the technical field of a desulfurization and denitrification process, in particular to a combined adsorbent for flue gas desulfurization and denitrification and a flue gas desulfurization and denitrification method. The combined adsorbent consists of a low-temperature adsorbent and a high-temperature adsorbent, wherein the high-temperature adsorbent comprises a porous carrier, a metal oxide and a binder; and the low-temperature adsorbent comprises a porous carrier and a binder, and possibly contains a metal oxide. The flue gas desulfurization and denitrification methodcomprises the following steps of flue gas dedusting, combined adsorption desulfurization and denitrification, and adsorbent regeneration and sulfur dioxide curing. The problems that in the prior art,the desulfurization and denitrification cost is high, a desulfurizing agent cannot be reused, and secondary pollution is caused are solved. The method has the characteristics of no water consumption,no low-quality byproducts, no consumption of lime and synthetic ammonia with high environmental protection pressure, low investment, small land occupation, low adsorbent loss, long service life, highpollutant removal rate, no secondary pollution and capability of realizing utilization of sulfur-containing flue gas as resources, has good industrial application prospects, and can be used for fluegas treatment of power plants, steel plants and petrochemical plants.

Description

technical field [0001] The invention relates to the technical field of desulfurization and denitrification technology, in particular to a combined adsorbent for desulfurization and denitrification of flue gas and a method for desulfurization and denitrification of flue gas. Background technique [0002] At present, there are about a dozen flue gas desulfurization technologies that have been industrialized and are being researched at home and abroad. These methods can be divided into dry and wet methods in terms of technology, and can be divided into discarding and recycling methods in terms of recovery and utilization of desulfurizers. Among them, the main methods that have been industrialized or pilot-tested are: 1) ammonium sulfite method; 2) citrate method; 3) activated carbon wet desulfurization; 4) wet desulfurization to produce phosphorus and ammonium compound fertilizer; 5) electron beam desulfurization ; 6) Lime-gypsum desulfurization, etc. [0003] At present, wet ...

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Problems solved by technology

[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a combined adsorbent for flue gas desulfurization and denitrification, which is used to solve the problem of high desulfurization and denitrification costs in the prior art, desulfurization agents that cannot be reused, and secondary At the same time, the present invention will also provide a flue gas desulfurization and denitrification method using a combined adsorbent; the present invention has the advantages of no water consumption, no low-quality by-products, no lime and synthetic ammonia consumption, investment and occupation of environmental protection pressure Small area, low loss of adsorbent, long life, high pollutant removal rate, no secondary pollution, the characteristics of realizing the resource utilization of flue gas and the advantages of good industrial application prospects

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