Denitration system for removing nitrogen oxide in sintering flue gas and flue gas denitration method

Abstract

The invention provides a denitration system for removing nitrogen oxide in sintering flue gas. The denitration system comprises a tower body, an inlet flue and an outlet flue, wherein the tower body comprises an ash deposition bucket, a first catalyst layer ash cleaning device, a first catalyst layer, a second catalyst layer, a second catalyst layer ash blowing device, a third catalyst layer ash cleaning device and a third catalyst layer, which are arranged in sequence from bottom to top. The denitration system provided by the invention has the prominent characteristics that coke oven gas or natural gas is used as a denitration agent; the gas denitration agent is introduced so that the transportation and storage cost of the denitration agent is saved and secondary pollution is avoided; meanwhile, waste gas also can be effectively utilized and very good technical effects of saving cost and protecting environment are realized.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to the technical field of flue gas treatment, in particular to a system and a flue gas removal method for removing nitrogen oxides in sintering flue gas. Background technique [0002] Sintering flue gas mainly comes from the sintering of iron ore in iron and steel enterprises, and the main pollutants in the emissions include particulate matter, sulfur dioxide, nitrogen oxides, and dioxins. Some outstanding problems in some sintering flue gas treatment processes include: 1) A single desulfurization process cannot meet the entire requirements of flue gas emissions; 2) The combined desulfurization and denitrification process lacks the treatment of dioxin and heavy metal pollutants; 3) After the desulfurization process Adding denitrification process, dioxin emission reduction process or heavy metal pollutant treatment process alone will cause problems such as high inve...

AI Technical Summary

Problems solved by technology

Some outstanding problems in some sintering flue gas treatment processes include: 1) A single desulfurization process cannot meet the entire requirements of flue gas emissions; 2) The combined desulfurization and denitrification process lacks the treatment of dioxin and heavy metal pollutants; 3) After the desulfurization process Adding denitrification process, dioxin emission reduction process or heavy metal pollutant treatment process alone will cause problems such as high investment and operating costs; 4) There are problems of easy blockage, corrosion, and high cost in the operation of equipment to varying degrees; 5) There is no comparison Good harmless treatment and comprehensive utilization of by-products, resulting in waste of resources

However, due to the high activation temperature of CO reduction and the unstable concentration of CO in flue gas, this will inevitably cause fluctuations in denitrification efficiency, which is difficult to adapt to the future 100㎎ / Nm 3 (in NO 2 Calculated, sintering reference oxygen 16%) emission standard

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