A method and system for flue gas denitrification and dust removal

Abstract

The invention discloses a flue gas denitrification and dust removal method and system. The flue gas denitrification and dust removal method comprises the steps that firstly, a reducing agent is added into flue gas to obtain first flue gas, wherein the first flue gas comprises solid dust, nitrogen oxide and a reducing agent; secondly, the first flue gas is made to pass through a catalytic filter assembly, the dust in the first flue gas is stopped on the surface of the catalytic filter assembly to form a filter cake, the reducing agent and the nitrogen oxide in the first flue gas are subjected to a denitrification reaction in the catalytic filter assembly to generate nitrogen and water, and clean flue gas is obtained; thirdly, the clean flue gas is exhausted. According to the flue gas denitrification and dust removal method, the technology is simple, nitrogen oxide and solid dust in the flue gas can be effectively removed, the investment cost is low, the denitrification and dust removal efficiency is high, and the catalytic assembly is of a ceramic fiber sintering flexible structure and is resistant to corrosion, not prone to thermal shock and breakage and long in service life.

Description

technical field [0001] The invention relates to the technical field of flue gas purification methods and system design, in particular to a flue gas denitration and dust removal method and system. Background technique [0002] With the improvement of air pollution control and emission regulations, the pollution caused by particulate emissions and nitrogen oxides has attracted more and more attention, and the national emission control standards for particulate pollutants and nitrogen oxides in various industries have also been continuously improved. After being inhaled into the human body, particulate pollutants will directly enter the bronchi, interfere with gas exchange in the lungs, and cause diseases including asthma, bronchitis, and cardiovascular disease. x , mainly including NO, NO 2 , N 2 O, etc.) emissions into the atmosphere will not only form acid rain, but also cause chemical smog, which is harmful to human health. [0003] The flue gas treatment process current...

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Problems solved by technology

[0010] Although this technology solves the deficiencies caused by denitrification and dedusting separation, there are still obvious defects. First, dedusting is only completed by the filter layer covering the outer surface of the support layer. If the filter layer falls off during installation and use, The integration of denitrification and dust removal is completely ineffective.

In addition, the support layer of ceramic powder sintering is brittle, has poor thermal shock resistance, and is easy to break due to thermal shock

[0011] Chinese patent CN103463871A, subject name is a denitrification and dust removal glass fiber film-coated filter material, which proposes a technical solution similar to the patent CN105315000A, the difference is that in the patent CN103463871A, glass fiber is used as the carrier of the SCR catalyst, and polytetrafluoroethylene is used Ethylene is used as the filter layer on the outer surface. Although such a combination of filter layer and support layer avoids the defect that the ceramic powder is prone to thermal shock in the patent CN105315000A, the filter layer of tetrafluoroethylene can withstand a limited temperature, and the temperature resistance of the continuous working condition is less than 250°C , the glass fiber used as a carrier also has the defect that the temperature resistance does not exceed 250°C

Therefore, the technology in the patent CN103463871A has poor overall temperature resistance except that the organic filter layer is not wear-resistant and easy to break, and can only be used in low temperature areas. unnecessary cost

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