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

A catalytic oxidation and selective technology, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of secondary pollution, high cost, large investment, etc., to reduce the concentration of particulate matter and small one-time investment , good reliability

Inactive Publication Date: 2014-03-26
张继惟
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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

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

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Embodiment Construction

[0021] The LSCO low-temperature selective catalytic oxidation integrated flue gas purification engineering system consists of gas mixer, SCO catalytic oxidation tower, integrated desulfurization, denitrification absorption tower and corresponding supply system, such as compressed air, ammonia water and other absorbent storage and transportation The supply system is composed of the flue gas which is dedusted by the dust collector 1 and mixed with the mixed gas composed of compressed air 3 and accelerator gas 4 ejected from the gas mixer 2 and enters the static mixer 5 for further mixing in the catalytic oxidation tower 6. NO in flue gas is oxidized to NO under the action of catalyst 7 2 and other NO x As the flue gas enters the bubbling absorption tower 8 and reacts with the absorbing liquid 10 to generate corresponding nitrate and nitrite, at the same time the SO in the flue gas 2 It is also absorbed together, as well as solid particles and other substances such as Hg, etc., ...

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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 ...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/75B01D53/60B01D53/64B01D53/78B01D50/00B01D53/56
CPCY02A50/20
Inventor 张继惟
Owner 张继惟
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