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Intermediate temperature efficient modified SNCR denitration device of layer-burning boiler and method

A denitrification and medium temperature technology, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of unstable denitrification efficiency required by the temperature window, affecting boiler operation efficiency, etc., achieving low investment and operation costs and improving operation efficiency , The effect of improving the efficiency of denitrification reaction

Active Publication Date: 2016-07-20
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the problems that the conventional SNCR denitrification technology affects the boiler operation efficiency, the temperature window is too high and the denitrification efficiency is unstable when the layer-fired boiler is implemented. and method, the present invention selects urea for use as denitrification reducing agent, by adding a certain concentration of additive solution (H 2 o 2 mixed solution with organic acid) to modify the denitrification reducing agent, while improving the denitrification efficiency of SNCR, it can significantly reduce the excessively high operating temperature required by the conventional SNCR method. , easy to install, and avoid secondary pollution such as ammonia escape to the greatest extent

Method used

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Effect test

Embodiment 1

[0045] The solid urea particles are stored in the urea storage bin 4, transported to the liquid distribution tank 6 by the screw conveyor 5, and the urea particles are dissolved into a urea solution with a concentration of 25% to 60% with deionized water; H 2 o 2 The concentration of the solution is 30%, and the amount added is according to H 2 o 2 and detected NO X The molar ratio is 1:1 to determine, the organic acid additive selects formic acid solution, the concentration is 20%, urea, H 2 o 2 and formic acid solution are sent to the premixing device 16 by No. 1 delivery pump 9, No. 2 delivery pump 12 and No. 3 delivery pump 15 through No. 1 flowmeter 8, No. 2 flowmeter 12 and No. 3 flowmeter 14 respectively, and mix well The modified solution is pressurized by the booster pump 17 and sprayed through the ammonia spray grid 2 from the atomizing nozzle 3 into the turning area of ​​the furnace outlet to form atomized droplets, where the smoke temperature at the nozzle posi...

Embodiment 2

[0047] The solid urea particles are stored in the urea storage bin 4, transported by the screw conveyor 5 to the liquid distribution tank 6, and the urea particles are dissolved into a urea solution with a concentration of 25% to 60% with deionized water; the concentration of the H2O2 solution is 30%, Add amount according to H 2 o 2 and detected NO X The molar ratio is 1:1 to determine, the organic acid additive selects acetic acid solution, the concentration is 20%, urea, H 2 o 2 and acetic acid solution are sent to the premixing device 16 by No. 1 delivery pump 9, No. 2 delivery pump 12 and No. 3 delivery pump 15 through No. 1 flowmeter 8, No. 2 flowmeter 12 and No. 3 flowmeter 14 respectively, and mix well The modified solution is pressurized by the booster pump 17 and sprayed into the turning area of ​​the furnace outlet through the ammonia spraying grid 2 by the atomizing nozzle 3 to form atomized droplets, where the smoke temperature at the nozzle position is 595°C. ...

Embodiment 3

[0049] The solid urea particles are stored in the urea storage bin 4, transported to the liquid distribution tank 6 by the screw conveyor 5, and the urea particles are dissolved into a urea solution with a concentration of 25% to 60% with deionized water; H 2 o 2 The concentration of the solution is 30%, and the amount added is according to H 2 o 2 and detected NO X The molar ratio is 1:1 to determine, the organic acid additive selects propionic acid solution, the concentration is 20%, urea, H 2 o 2 and propionic acid solution are sent to the premixing device 16 by No. 1 delivery pump 9, No. 2 delivery pump 12 and No. 3 delivery pump 15 through No. 1 flowmeter 8, No. 2 flowmeter 12 and No. 3 flowmeter 14 respectively, mix A good modified solution is pressurized by the booster pump 17 and sprayed through the ammonia spray grid 2 from the atomizing nozzle 3 into the turning area of ​​the furnace outlet to form atomized droplets, where the smoke temperature at the nozzle posi...

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Abstract

The invention discloses an intermediate temperature efficient modified SNCR denitration device of a layer-burning boiler and a method, and belongs to the technical field of coal-fired boiler pollutant control. Amino and imido free radicals are generated by urea under the synergistic effect of H2O2 and organic acid (formic acid or acetic acid or propionic acid), and due to the fact that amino free radicals .NH2 or imido free radicals .NH has higher reaction activity and selectivity on nitric oxide, a temperature window of an SNCR reaction can be greatly reduced; meanwhile, a modified reducing agent atomizing nozzle is located in a furnace outlet turning room of the layer-burning boiler, sufficient mixing of a modified reducing agent and nitric oxide can be assisted by the area, and thus the utilization rate of urea is increased. The device and the method are economical and environmentally friendly, implementation is easy, and the denitration efficiency is high; besides the layer-burning boiler, the device and the method are also applicable to coal-fired power plants and other coal-fried industrial processes, and have wide application prospects and high market popularization value.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide emission control of a layer-fired coal-fired boiler, in particular to a medium-temperature and high-efficiency modified SNCR denitrification device and method for a layer-fired boiler. Background technique [0002] China's industrial boilers play an important role in national economic and social development, and are widely used in metallurgy, building heating, coking and chemical industries. Driven by the strong demand in the domestic market, my country's industrial boiler industry as a whole maintained a steady and rapid growth. As of 2014, the output of my country's industrial boilers was 558,100 tons of evaporation, an increase of 8.9% compared with last year. my country is a country with coal as the main energy source. Coal-fired industrial boilers account for more than 65% of the total boilers. In the future, the coal-fired industrial boiler market will still occupy a relatively high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/56
CPCB01D53/56B01D53/79B01D2251/2067B01D2258/0283B01D2259/124
Inventor 陈磊赵钦新李钰鑫张锦萍焦健王云刚
Owner XI AN JIAOTONG UNIV
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