SNCR-SCR combined denitration system based on demercuration and deamination modified catalyst and denitration method achieved by adopting system

A technology of SCR system and denitrification catalyst, which is applied in the field of air pollutant control, can solve the problems of simultaneous removal of mercury pollutants and blockage of air preheater, achieve high zero-valent mercury oxidation efficiency, and ensure normal and stable operation , The effect of reducing the ammonia escape concentration

Inactive Publication Date: 2017-04-26
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Application Information

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Problems solved by technology

However, when the cloth bag-ammonia removal catalyst composite structure is applied to the flue gas treatment of coal-fired power plants, it can only reduce the ammonia escape concentration at the inlet of the desulfurization tower, and the air preheater is loc

Method used

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  • SNCR-SCR combined denitration system based on demercuration and deamination modified catalyst and denitration method achieved by adopting system
  • SNCR-SCR combined denitration system based on demercuration and deamination modified catalyst and denitration method achieved by adopting system
  • SNCR-SCR combined denitration system based on demercuration and deamination modified catalyst and denitration method achieved by adopting system

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preparation example Construction

[0046] The preparation method of the denitrification modified catalyst layer 1 comprises the following steps: soaking the catalyst unit of the SCR denitrification catalyst layer 2 in the soaking solution for 6-12 hours, and the amount of the soaking solution is 1 m 3 The catalyst unit uses 700-800mL of impregnation solution, the impregnation solution contains at least one of copper nitrate, molybdenum nitrate and ruthenium nitrosyl nitrate, the concentration of copper nitrate is 15-35g / L, and the concentration of molybdenum nitrate is 10-20g / L and the concentration of ruthenium nitrosyl nitrate is 10-25g / L, take it out and filter it dry, put it in a calciner and dry it at a temperature of 100-120°C for 10-15h, then roast it at a temperature of 400-500°C for 4-6h, and finally A denitrification modification catalyst layer 1 containing at least one of 1.5-2.5% Cu, 0.8-1.2% Mo and 0.8-1.2% Ru metal elements is obtained, and the existing forms are CuO, MoO3 and RuO 2 .

[0047] T...

Embodiment 1

[0067] The denitrification system of a 600MW unit in a coal-fired power plant was upgraded to transform the original SCR denitrification system into an SNCR-SCR combined denitrification system, and in the original two-layer SCR denitrification catalyst layer, the catalyst unit of the bottom catalyst layer After being treated with nitrate impregnation solution and modified after roasting, the denitration modified catalyst layer is obtained, so that the denitration system becomes a form of one layer of SCR denitration and denitration catalyst layer + one layer of denitration modified catalyst layer.

[0068] The preparation method of the denitrification modification catalyst layer comprises the following steps: soaking the catalyst unit of the SCR denitration catalyst layer for 10 hours in an immersion solution, the amount of the immersion solution being 1 m 3 The catalyst unit uses 700mL impregnating solution, the concentration of molybdenum nitrate in the impregnating solution ...

Embodiment 2

[0075] The denitrification system of a 200MW unit in a coal-fired power plant was upgraded, the original SNCR denitrification system was upgraded to an SNCR-SCR combined denitrification system, and a layer of SCR denitrification and denitrification catalyst layer and a layer of denitrification modified catalyst layer were added to make the denitrification system It becomes a form of one layer of SCR denitration and denitration catalyst layer + one layer of denitration modification catalyst layer.

[0076] The preparation method of the denitrification modification catalyst layer comprises the following steps: soaking the catalyst unit of the SCR denitration catalyst layer for 10 hours in an immersion solution, the amount of the immersion solution being 1 m 3 The catalyst unit uses 700mL impregnating liquid, the concentration of copper nitrate in the impregnating liquid is 25g / L, the concentration of molybdenum nitrate is 15g / L, take it out and dry it, put it in a calciner and dr...

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Abstract

The invention belongs to the technical field of control over atmospheric pollutants discharged by coal-fired boilers, and particularly relates to an SNCR-SCR combined denitration system based on a demercuration and deamination modified catalyst and a denitration method achieved by adopting the system. The SCR system comprises an SCR nozzle, a flow guiding blade, a flow straightening grid and SCR denitration catalyst layers which are located between a coal economizer and an air preheater, and a denitration modified catalyst layer is arranged under the SCR denitration catalyst layers and comprises a catalyst carrier, active denitration ingredients and active demercuration and deamination ingredients. According to the combined denitration system, mercury and ammonia in flue gas can be removed simultaneously, and the removal rate of zero-valent mercury in the flue gas and the removal rate of ammonia in the flue gas can reach 99% or above and 95% or above respectively.

Description

technical field [0001] The invention belongs to the technical field of controlling air pollutants discharged from coal-fired boilers, and in particular relates to an SNCR-SCR combined denitrification system and a denitrification method based on a modified catalyst for demercuration and deammoniation. Background technique [0002] Electricity is an important energy pillar for social and economic development. At present, my country's current source of electricity is still dominated by coal-fired power generation. During the combustion of coal, a large amount of gaseous pollutants, such as sulfur dioxide (SO 2 ), nitrogen oxides (NO x ), soot, and heavy metals such as mercury. Therefore, coal-fired power plants must be equipped with corresponding environmental protection facilities such as desulfurization, denitrification, and dust removal to ensure that the coal-fired flue gas can be discharged after purification. [0003] At present, the mercury content in coal combustion i...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/58B01D53/64B01D53/86B01D53/78
CPCB01D53/8625B01D53/78B01D53/8634B01D53/8665B01D2251/2062B01D2255/1026B01D2255/20707B01D2255/20761B01D2255/20769
Inventor 董锐锋吴文龙王锋涛张小霓杨硕张雪盈陈浩军
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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