Flue gas multi-pollutant adsorption removal and recycling method based on waste heat utilization

Abstract

The invention belongs to the field of waste heat utilization and particularly relates to a flue gas multi-pollutant adsorption removal and recycling method based on waste heat utilization. The methodis used for separating multiple pollutants in high-temperature flue gas, recovering waste heat in the flue gas at the same time and applying the waste heat in separation of the pollutants to realize multi-pollutant adsorption removal and recycling of the flue gas. The method has the advantages of high purification efficiency, high process integration degree, high energy efficiency, low running cost, remarkable economic benefits and the like.

Description

Technical field [0001] The invention belongs to the field of waste heat utilization, and in particular relates to a flue gas multi-pollutant adsorption removal and resource utilization method based on waste heat utilization. Background technique [0002] Industrial flue gas contains a lot of SO 2 And NOX and other pollutants, the concentration is usually 200-1500mg / Nm 3 , Often use calcium method desulfurization, SCR catalytic denitrification and other technologies for digestion, removal or conversion into other waste. In fact, high purity SO 2 , NO 2 And NO has important application value in many fields such as metallurgy, chemical industry, medicine, etc., and these components in flue gas should become its important source. Separation, enrichment and resource utilization of flue gas pollutants has become an important green economic pollution control trend. However, to effectively realize this technical route, there are still two major bottlenecks: (1) Flue gas multi-pollutants ...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the current integrated multi-pollutant removal process of industrial flue gas mainly includes wet desulfurization + SCR destocking, activated coke desulfurization + SCR destocking, etc., which have the following disadvantages: (a) long process flow, low integration, and low High operating requirements; (b) Wet desulfurization requires continuous replenishment of desulfurizer and water, while activated coke desulfurization requires continuous replenishment of active coke due to high temperature desorption and continuous loss in the process of circulating fluidization; (c) SCR denitrification requires expensive precious metals Catalyst, the catalyst is easily covered by dust, SO 2 poisoning; (d) the SCR process needs to inject a large amount of ammonia water, which will cause the problem of ammonia escape pollution; (e) the process consumes a lot of energy and the efficiency of waste heat utilization is low; (f) NO X been digested, and did not form the resource recovery of pollutants with high economic benefits

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