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A denitrification system and method using catalytic hydrogen peroxide

A hydrogen peroxide and denitrification technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as low utilization rate and incomplete oxidation, and achieve improved utilization rate, stable product quality, and reasonable process design Effect

Active Publication Date: 2018-03-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of H in the prior art denitrification process 2 o 2 For the problems of low utilization rate and incomplete oxidation, the present invention provides a denitrification system and method using catalytic hydrogen peroxide, which can remove NO in the flue gas after dedusting X Realize deep oxidation, the tail gas after treatment can be absorbed by lye to realize NO X Efficient removal of

Method used

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  • A denitrification system and method using catalytic hydrogen peroxide
  • A denitrification system and method using catalytic hydrogen peroxide
  • A denitrification system and method using catalytic hydrogen peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] h 2 o 2 Mass fraction is 3% H in the solution storage tank (2) 2 o 2 The solution is measured by the No. 1 flow meter (3), and is transferred by the No. 1 transfer pump (4) and flows through the heating device (5) to change into H 2 o 2 steam, h 2 o 2 The steam passes through the grid (7) and mixes with the dedusted flue gas entering from the flue gas inlet A of the reaction tower (6). The NO content in the flue gas is 600ppm, the inlet flue temperature is 180°C, and the mixed gas passes through the coating with 1% Fe-TiO 2 The corrugated plate (8) of the catalyst generates acid gas containing nitrous acid and nitric acid, wherein the space velocity ratio is 60000h -1 . The lye in the lye storage tank 9 is metered by the No. 2 flowmeter (10), and is transported to the spraying device (12) by the No. 2 delivery pump (11) to form alkaline atomized droplets, and the alkaline atomized droplets The acid gas is washed to generate nitrite and nitrate solut...

Embodiment 2

[0049] When using the method of Example 1 to carry out denitrification, wherein, the concentration of nitric oxide in the treated flue gas is 750ppm, and the catalyst is 2% Fe-TiO 2 , the airspeed ratio is 60000h -1 , the mass fraction of hydrogen peroxide is 4%, the molar ratio of hydrogen peroxide to nitric oxide is 12:1, the inlet smoke temperature is 200°C, the oxidized acid gas is absorbed by lye spray, and the denitrification efficiency reaches 92%. The waste liquid at the bottom of the tower is detected by ion chromatography, and the molar ratio of nitrate and nitrite is 7.4:1.

Embodiment 3

[0051] When using the method of Example 1 to carry out denitrification, wherein, the concentration of nitric oxide in the treated flue gas is 550ppm, and the catalyst is 3% Fe-TiO 2 , the airspeed ratio is 60000h -1 , the mass fraction of hydrogen peroxide is 4%, the molar ratio of hydrogen peroxide to nitric oxide is 16:1, the inlet smoke temperature is 220°C, the oxidized acid gas is absorbed by lye spray, and the denitrification efficiency reaches 91%. The waste liquid at the bottom of the tower is detected by ion chromatography, and the molar ratio of nitrate and nitrite is 6.9:1.

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Abstract

The invention relates to the field of industrial process oxidation catalysis and environmental governance of fossil fuel combustion and discloses a denitrifying system adopting catalytic hydrogen peroxide and a method thereof. The flue gas after dust removal enters from the top end of a reaction tower and is sufficiently mixed with the vaporized hydrogen peroxide steam before passing through a catalyst layer; under the effect of a corrugated plate catalyst, a catalytic oxidation reaction is finished; and the generated acid gas is absorbed by alkali liquid to realize removal of nitrogen oxide. In the invention, the titanium dioxide existing in a form of anatase is adopted as a matrix while iron oxide serves as a promoter; the adopted oxidant and catalyst have the advantages of high denitrifying efficiency, reasonable technological design, environmental friendliness and no toxin, low construction cost and stable product quality; and meanwhile, the denitrified product in the technology can be used as an agricultural chemical fertilizer or industrial raw material while secondary pollution to the environment is avoided.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide treatment, in particular to a denitrification system using catalytic hydrogen peroxide and a method thereof. Background technique [0002] Fossil fuel combustion is an anthropogenic emission of nitrogen oxides (NO X ), and nitrogen oxides, such as acid rain, photochemical smog and ozone depletion, have caused great harm to the normal life and production of residents. With NO X The pollution problem is becoming more and more serious, and the governments of various countries have increased the control of NO X Emission Control Efforts [0003] Most commonly used NO for fossil fuel combustion X The treatment scheme is Selective Catalytic Reduction (SCR), which has certain technical defects, such as high temperature window (320-400°C), high investment and operation costs, and ammonia escape; the use of ozone oxidation denitrification overcomes the SCR denitrification temperature higher draw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8631B01D2251/106B01D2255/20707B01D2255/20738Y02A50/20
Inventor 赵钦新陈磊王云刚梁志远徐志文
Owner XI AN JIAOTONG UNIV
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