Desulfurization and denitrification process utilizing microwave to intermittently irradiate activated carbon

Abstract

Disclosed is a desulfurization and denitrification process utilizing microwave to intermittently irradiate activated carbon. Two or more adsorption beds filled with activated carbon particles are used for adsorbing or implementing microwave irradiation to flue gas of boilers alternatively. Flue gas is delivered into one of the adsorption beds by an induced draft fan, then the adsorption bed begins to run, and sulfur and nitric oxides in the flue gas are adsorbed by the activated carbon. After the activated carbon in the adsorption bed in running is saturated, the adsorption bed is in a regenerating state so as to be reused. The flue gas is delivered into the other adsorption bed beginning to run so as to be adsorbed, activated carbon particles of the regenerating adsorption bed are irradiated by microwave, sulfur and nitric oxides adsorbed on the surface of the activated carbon are quickly reduced and decomposed into elemental sulfur and nitrogen gas under high temperature, and the different adsorption beds are switched between the running state and the regenerating stage alternatively. Metal oxide is used as a reduction reaction catalyst so as to reduce reduction and decomposition temperature and loss of carbon. By the desulfurization and denitrification process, energy consumption of microwave irradiation can be reduced greatly, loss of carbon can be decreased, and in-situ regeneration of activated carbon is realized. In addition, the desulfurization and denitrification process has the advantages of fine desulfurization and denitrification effect, short time for regeneration of activated carbon, low cost for desulfurization and denitrification, high recovery rate, easiness in industrialized implementing and the like.

Description

technical field [0001] The invention relates to a flue gas purification method, in particular to a method and device for desulfurization and denitrification of activated carbon by microwave intermittent irradiation, and belongs to the technical field of flue gas purification. Background technique [0002] For environmental protection and sustainable development, countries around the world have established increasingly stringent standards for the emission of sulfur dioxide and nitrogen oxides. 2 , NO X Emission requirements have been substantially increased. Through continuous technological innovation, it is an important way to solve the problem of flue gas pollution control by realizing high-efficiency and low-consumption flue gas pollution control. Flue gas desulfurization is currently the world's leading technology to control acid rain and SO 2 The most effective and main technical means of pollution. Its mainstream technology is limestone gypsum washing method, which ...

AI Technical Summary

Problems solved by technology

However, the common problems of the above-mentioned microwave desulfurization and denitrification technologies are as follows: 1. Activated carbon is continuously irradiated by microwaves, and the activated carbon continues to work at high temperatures, resulting in serious carbon loss; The operating cost is high, which affects the industrial implementation of this technology; 3. The catalyst selection needs to be improved, such as the patent CN101693162A discloses that CuCl is used as the catalyst, but there are difficulties in preparing CuCl, unstable chemical properties, and the presence of oxygen in the flue gas on CuCl. Oxidation, deliquescence due to its easy absorption of water vapor, etc., all of which damage its catalytic activity to varying degrees; 4. Under high temperature conditions, continuous microwave irradiation will cause oxygen in the flue gas to consume a large amount of activated carbon, thus making the process economical. poor

Images