Integrated engineering system for purifying flue gas by LSCO (low-temperature selectivity catalytic oxygen)

Abstract

The invention relates to a special gas humidifying, mixing and injecting system, a catalyst tower, special catalysts and an absorption tower for absorbing SO2, NOx and Hg particles in flue gas simultaneously. Effective ammonium sulfate and ammonium nitrate can be generated in a tower in which ammonia hydroxide is taken as an absorbent. Compared with the prior art, such as an SCR (Selective Catalytic Reduction) method, the system has the following beneficial effects: (1) the temperature greater than 200 DEG C is not required when the system operates within a conventional kiln flue gas temperature range (60-150 DEG C), so that the existing boiler structure is not required to be transformed, and only the flue channel part needs to be transformed; (2) byproducts are ammonium sulfate and ammonium nitrate fertilizers, and are not required to be converted into N2 by reduction, so that the system has considerable running benefit; (3) the system is long in service life, good in reliability, low in investment, and high in NOx removing efficiency; (4) an oxidant is generally compressed air, and expensive high-value oxidants such as hydrogen peroxide and ozone are not required.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a flue gas purification technology system Background technique [0002] At present, the denitrification technologies in China are SCR and SNCR methods, and the main defects are: [0003] (1) It is necessary to modify the complete boiler and destroy the original boiler; [0004] (2) Need to work under high temperature conditions, SCR method: 280-420°C, SNCR method: 930-1093°C, which have higher requirements for systems and materials; [0005] (3) The highly toxic V2O5 contained in the SCR catalyst is likely to cause secondary pollution, which requires expensive micro-waste treatment; [0006] (4) The working environment is harsh, easy to fail, and the life is short. The general life of the catalyst is only about 16000h; [0007] (5) High operating cost: due to the selective catalytic reduction method, a large amount of ammonia is used as a reducing agent to reduce NO in ...

AI Technical Summary

Problems solved by technology

[0005] (3) The highly toxic V2O5 contained in the SCR catalyst is likely to cause secondary pollution, which requires expensive micro-waste treatment;

[0006] (4) The working environment is bad, it is easy to fail, and the life is short. The general life of the catalyst is only about 16000h;

[0007] (5) High operating cost: due to the selective catalytic reduction method, a large amount of ammonia is used as a reducing agent to reduce NO in flue gas x for N 2 emission;

[0008] (6) A more precise control and purging system is required, and the investment is large

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