Method of desulfurizing and denitrate simultaneously of exhaust gas by micro wave catalysis

A technology of desulfurization and denitrification and microwave catalysis, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of easy damage of titanium target windows, high primary cost, secondary pollution, etc., and achieve short residence time and improved Efficiency, the effect of simple process

Inactive Publication Date: 2006-08-30
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

The main problem of this method is: need to inject NH 3 , easy to leak during transportation and storage; the denitrification rate is low and only suitable for use in high-sulfur coal areas; the electron accelerator and vacuum system equipment is huge, and the primary cost is high; X-ray radiation is harmful, so it is necessary to install 1-2m thick radiation-proof cement layer; titanium target window is easily damaged, etc.
However, the electron gun in this method is expensive; the reaction temperature is 70°C, the flue gas needs to be cooled first, and then heated up when it is discharged; use NH 3 Recovery of SO 2 and NO, NH 3 Leakage may occur during transportation and storage, resulting in secondary pollution
[0008] The use of microwave heating for flue gas catalytic denitrification has been reported in Chinese patent (application number 200510027964.6). Microwave heating not only has a denitrification rate of over 90%, but also can reduce the reaction temperature and increase the reaction speed; but the patent does not involve catalyst deactivation After how to regenerate and SO 3 , NO 2 Recycling and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Powdered γ-Al with a particle size of 200-300 mesh 2 o 3 At a certain concentration of 50% Mn(NO 3 ) 2 Soak in the solution, mix well, air-dry at normal temperature and pressure for 4 hours, press into tablets at 50MPa, then dry at 180°C, then calcined in the air atmosphere, after cooling, crush into granular MnO with a particle size of 10-40 mesh 2 / γ-Al 2 o 3 (hereinafter abbreviated as catalyst A).

Embodiment 2

[0030] A certain amount of catalyst A was placed in a specially designed fixed-bed reactor, and the simulated flue gas was fed under normal temperature and pressure while heating by microwave (output power: 385W). The simulated flue gas was composed of SO 2 560ppm, NO 280ppm, O 2 10% by volume, N 2 As balance gas, air speed is 800h -1 , SO at 180°C 2The removal rate reaches 95%, and the NO removal rate reaches 82%.

Embodiment 3

[0032] A certain amount of catalyst A was placed in a specially designed fixed-bed reactor, and the simulated flue gas was fed under normal temperature and pressure while heating by microwave (output power: 385W). The simulated flue gas was composed of SO 2 560ppm, NO280ppm, O 2 10% by volume, N 2 For balance gas, the air speed is 5600h -1 , at 180°C, SO 2 The removal rate reaches 98%, and the NO removal rate reaches 89%.

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Abstract

The present invention discloses a flue gas purifying method capable of catalyzing flue gas by using microwave and simultaneously making desulfurization and denitration. Said method is characterized by that firstly, the catalyst is placed in a special-designed fixed bed reactor, then the normal-pressure simulated flue gas is introduced to make microwave catalytic desulfurization and denitration reaction. Its desulfurization and denitration efficiency is high, when the space velocity is 8000h-1 and the temperature is 150deg.C, its desulfurization rate can be up to 95% and its denitration rate can be up to 87%, and its catalyst can be regenerated and reused.

Description

technical field [0001] The invention belongs to the field of industrial waste gas treatment, and in particular relates to a simultaneous desulfurization and denitrification purification method for microwave catalytic flue gas. Background technique [0002] Coal is the main energy source in our country. For quite a long time in the future, the utilization of coal in my country will still be dominated by combustion. A large amount of SO emitted during coal combustion 2 and NOx, seriously polluting the ecological environment such as the atmosphere. Therefore, how to economically and effectively control SO in coal-fired flue gas 2 and NO x The discharge of coal has become a major problem that needs to be solved urgently in my country's sustainable development strategy, and it is also the development direction of the world's coal-burning pollution control technology. At home and abroad, in the analysis of SO in coal-fired flue gas 2 and NO x Many technologies have been dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/86
Inventor 徐云龙吴春梅钱秀珍马新胜於定华
Owner EAST CHINA UNIV OF SCI & TECH
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