Medium and low temperature wide-load SCR (Selective Catalytic Reduction) denitration device and method

A denitrification and low temperature technology, applied in the field of flue gas denitrification, can solve the problems of increasing the volume of denitrification devices and the cost of catalysts, and achieve the effects of saving equipment investment and operating costs, prolonging life, and reducing operating costs.

Active Publication Date: 2018-11-23
YANCHENG ENVIRONMENTAL ENG TECH RES & DEV CENT TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a medium and low temperature catalyst (catalytic reaction temperature is 180°C-300°C) is used to meet the denitrification efficiency under low boiler load conditions, it will lead to problems such as an increase in the volume of the denitrification device and an increase in the cost of the catalyst.

Method used

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  • Medium and low temperature wide-load SCR (Selective Catalytic Reduction) denitration device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a medium-low temperature wide-load SCR denitrification device is installed behind the dust collector, including the denitrification device body. The denitrification device body is equipped with a high-temperature electrostatic precipitator flue 1, a flue deflector 2, and an inlet deflector 3. , rectifying grid 4, ammonia injection grid 5, temperature sensor 6, medium and low temperature catalyst layer 7, medium and high temperature catalyst layer 8, backup catalyst layer 9 and outlet flue 10, the flue gas inlet is set above the denitrification device body, and the flue gas The outlet is set at the bottom of the denitrification device body, the top of the denitrification device body is an inclined surface with an inclination angle of 30~40°, the shell of the denitrification device body is at an angle of 80~85° with the horizontal plane, and the flue gas inlet is provided with a flue guide plate 2 and The inlet deflector 3 and the flue deflector...

Embodiment 2

[0036] O in simulated flue gas 2 The volume fraction is 6%, NO x The concentration is 2000ppm, the balance gas is N 2 , its airspeed is 50000h -1 , the flue gas flow rate is 80L / h, the flue gas temperature is controlled at 250-410°C, the flue gas flow rate inside the denitrification device is steadily accelerated, the medium and low temperature catalyst layer 7 and the spare catalyst layer 9 are selected from the Mn-V-W-Ti system catalyst, the medium and high temperature catalyst The V-W-Ti system catalyst is selected for the layer, and the contact time between the flue gas and the catalyst is controlled to be about 200ms, which is beneficial to the diffusion, adsorption, reaction, and desorption and diffusion of the reaction gas in the micropores of the catalyst.

[0037] After the inlet flue gas passes through the high-temperature electrostatic precipitator, the flue 1 and the flue deflector 2 enter the interior of the denitrification device, and the airflow direction is c...

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Abstract

The invention discloses a medium and low temperature wide-load SCR (Selective Catalytic Reduction) denitration device and method. The medium and low temperature wide-load SCR denitration device comprises a high-temperature electric precipitation rear flue, a flue guide plate, an inlet guide plate, an outlet flue, rectifying grids, ammonia spraying grids, a medium and low temperature catalyst layerand a medium and high temperature catalyst layer, wherein the rectifying grids and the ammonia spraying grids are arranged above the medium and low temperature catalyst layer and between the medium and low temperature catalyst layer and the medium and high temperature catalyst layer; external flue gas flows into a denitration device body through the high-temperature electric precipitation rear flue and the flue guide plate, and is subjected to catalytic denitration through the medium and low temperature catalyst layer and the medium and high temperature catalyst layer; the gas subjected to the denitration is exhausted through the outlet flue; ammonia gas is sprayed through the ammonia spraying grids, and is subjected to a denitration reaction with NOx in the flue gas under the action of acatalyst. By adopting the medium and low temperature wide-load SCR denitration device and method provided by the invention for treating the NOx in the precipitated flue gas, so that efficient denitration under the conditions of variable load as well as flue gas temperature and flow fluctuation in a boiler is realized, and equipment investment and running cost can be reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a medium-low temperature wide-load SCR denitrification device and a denitrification method. Background technique [0002] Nitrogen oxide (NOx) is one of the important pollutants in the atmosphere, which can cause air pollution problems such as acid rain and photochemical pollution. The emission of NOx mainly comes from the massive combustion of fossil fuels, especially in thermal power, metallurgy, building materials and other industries. The main source of NOx emissions in my country, but with the development of my country's economy, NOx emission standards have become more and more stringent. Therefore, more efficient and comprehensive NOx control technologies are required. [0003] Selective Catalytic Reduction (SCR) technology is currently recognized as the most effective NOx control technology, and its denitrification efficiency can reach more than 90%. It is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
CPCB01D53/8631B01D53/90B01D2255/20707B01D2255/20723B01D2255/20776
Inventor 陈建军周正李俊华郦杲辉祁德祥
Owner YANCHENG ENVIRONMENTAL ENG TECH RES & DEV CENT TSINGHUA UNIV
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