Method for removal of NOx from flue gas by UV catalytic oxidation

A catalytic oxidation and flue gas technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of interfering with UV photocatalytic effect, affecting the appearance of smoke plume, and low ozone concentration

Inactive Publication Date: 2019-04-12
TSINGHUA UNIV
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Problems solved by technology

However, the power consumption of the ozone generator is large, and the concentration of ozone generated is low; in addition, due to the high oxidation potential of ozone, it is very easy to oxidize trace impurities in the flue gas, which affects the appearance of the plume; patent CN107281918A[8], patent CN206604381U[ 9], patent CN206688527U[10] and patent CN206715686U[11] proposed to use UV lamp tube to catalyze the oxidation of organic waste gas and odorous gas containing formaldehyde, toluene, xylene and acetone, but the oxidation reactor lacks flow field optimization and the reaction efficiency is not good. Gao; patent CN201807286U[12] proposes a simultaneous desulfurization and denitrification system based on photochemical advanced oxidation, but in this method, a UV lamp is installed in the spray tower to catalyze the oxidation of NO by hydrogen peroxide. Severely interfere with UV photocatalytic effect

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  • Method for removal of NOx from flue gas by UV catalytic oxidation

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Embodiment 1

[0030] NO content is 512mg / m 3 (working condition) mixed gas (others are N 2 ), the temperature is 190°C, the pressure is 1atm, and the flow rate is 1800m 3 / h, add 27.5% H 2 o 2 Aqueous solution 30L / h, reacted at 130°C in a UV irradiation reactor, treated with 10% NH 3 After the aqueous solution is absorbed at 20°C, the NO content in the exhaust gas is 5mg / m3, and the NO 2 It is 140mg / m3.

Embodiment 2

[0032] NO content is 468mg / m 3 (working condition) mixed gas (others are N 2 ), the temperature is 185°C, the pressure is 1atm, and the flow rate is 1500m 3 / h, add 27.5% H 2 o 2 Aqueous solution 25L / h, reacted at 111°C in a UV irradiation reactor, treated with 10% NH 3 After the aqueous solution is absorbed at 15°C, the NO content in the exhaust gas is 7mg / m 3 , NO 2 132mg / m 3 .

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Abstract

The invention discloses a method for removal of NOx from flue gas by UV catalytic oxidation. Based on the principle of oxidation of NO in flue gas by UV catalysis of H2O2, the method employs a modularreactor, can effectively improve the oxidation conversion rate of NO, saves investment and is low in cost, thus having good market promotion prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to the purification of flue gas, in particular to a method for removing NOx in flue gas by UV catalytic oxidation. Background technique [0002] my country is a country where coal is the main fuel, and the consumption of coal continues to increase, which has brought harm to the environment, especially the SO in the exhaust gas 2 , NOx, is the main source of air pollution. Control and reduce SO in flue gas 2 NOx and NOx are environmental problems that need to be solved urgently in our country. Flue gas denitrification is to control and reduce SO in flue gas. 2 and an important means of NOx. [0003] At present, the main methods of flue gas denitrification are as follows: refer to the following patents or documents 1-5. [0004] SCR is a relatively mature denitrification method in the current industry. This method has high denitrification efficiency, but it has di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/007B01D53/8625B01D2251/2062B01D2255/802B01D2258/0283B01D2259/804
Inventor 汤志刚王玉军王登富陈桂花姜爱国韩祺祺谢振强郭栋
Owner TSINGHUA UNIV
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