Novel catalytic desulfurization and denitration apparatus and technology aiming at coke oven flue gas

Abstract

A novel catalytic desulfurization and denitration apparatus and technology aiming at coke oven flue gas, relating to the field of coke oven flue gas purification. In the desulfurization, by using water, oxygen, SO2 and heat in flue gas, sulfuric acid in certain concentration is produced; in the denitration, by means of the denitration principle of NH3-SCR, a nano multi-metal catalyst is used as adenitration catalyst with assistance of an ammonia removal catalyst, thus achieving integration of denitration and ammonia removal. The key of the technology is the catalysts: in the desulfurization,a desulfurizer prepared by supporting a certain active component on a supporter, wherein the desulfurizer has catalytic effect on the SO2 oxidization to produce acid process; in the denitration, by using the nano multi-metal catalyst as the denitration catalyst, reaction temperature zone is controlled at 80-140 DEG C, so that the catalyst is a real low-temperature catalyst. The whole technology issimple in process and low in energy consumption.

Description

technical field [0001] The invention relates to the technical field of coke oven flue gas purification, in particular to a novel catalytic desulfurization and denitrification device and process for coke oven flue gas, that is, through the catalytic desulfurization system and process, it is suitable for desulfurization and denitrification of coke oven flue gas, removing SO in flue gas 2 and NOx. Background technique [0002] Coke oven is one of the most serious air pollution equipment in the metallurgical industry. The components of pollutants emitted by coke ovens are complex, including nitrogen oxides (NOx), sulfur dioxide, carbon monoxide, carbon dioxide, hydrogen sulfide, hydrogen cyanide, residual ammonia, phenol, coal dust, tar, etc. These pollutants have aggravated the smog degree of pollution. [0003] In recent years, smog has frequently appeared in most parts of our country. The country has paid more and more attention to environmental protection (air pollution),...

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Problems solved by technology

[0011] b) If the SCR is arranged after desulfurization, the dust and SO 2 The concentrations are all low, but the flue gas temperature is low, which cannot meet the temperature requirements of alum-based catalysts, so it needs to be heated up, and a heating furnace is required, which consumes a lot of energy; even for low-temperature alum-based catalysts, it needs to reach a temperature above 260°C

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