Device and method for treating organic waste gas by catalysis and ozonation

An organic waste gas, catalytic oxidation technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of poor reaction selectivity between ozone and organic matter, difficult to achieve removal effect, and inability to decompose organic matter, and save energy consumption. , The effect of preventing secondary pollution and reducing operating costs

Active Publication Date: 2014-04-16
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although ozone can oxidize many refractory organic compounds, its oxidation characteristics determine that a single ozone oxidation technology has great limitations
One is that the reaction selectivity of ozone and organic matter is poor, and it cannot oxidize some refractory organic matter, such as chloroform; the other is that a single ozone oxidation technology cannot completely decompose organic matter into CO2 and H2O, and it is difficult to achieve a high removal effect at the same time. Often carboxylic acids are easily biodegradable organic compounds, such as: mono-aldehydes, di-aldehydes, aldehyde acids, mono-carboxylic acids, di-carboxylic acids, small organic molecules

Method used

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  • Device and method for treating organic waste gas by catalysis and ozonation

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Effect test

Embodiment 1

[0054] A certain organic waste gas containing low-concentration benzene series is processed by the above-mentioned device and process of the present invention, and enters the catalytic oxidation device through the induced draft fan. The catalyst carrier is γ-type alumina, the active component is manganese oxide, and the load is about 5%. The concentrations of ozone and benzene series are 70mg / m 3 and 15mg / m 3 . It can react at room temperature, and the purification efficiency of benzene, toluene, and p-xylene can reach 75%, 84%, and 88% respectively; when the reaction temperature is raised above 90°C, the purification efficiency of benzene, toluene, and p-xylene can reach 95% %above.

[0055] The above-mentioned organic waste gas containing low-concentration benzene series also adopts the above-mentioned device and process of the present invention. When no catalyst is placed, the purification efficiency of ozone to benzene, toluene and p-xylene can be ignored at room temper...

Embodiment 2

[0057] Another certain organic waste gas containing benzene, adopts the above-mentioned device and process of the present invention, enters the heat exchanger through the induced draft fan after pretreatment, and then enters the catalytic oxidation device for treatment. The catalyst carrier is γ-type alumina, the active component is a mixture of cobalt oxide and chromium oxide, the ratio of cobalt to chromium is 4:1, and the load is 8.5-10%. The concentration ratio of ozone to benzene is about 10:1, and when the reaction temperature is 100-150°C, the purification efficiency of benzene is about 75%-96%.

[0058] The above-mentioned same benzene-containing organic waste gas uses the same type of treatment device and catalyst. When ozone is not used, the reaction temperature needs to be raised to 300-360°C, and the purification efficiency of benzene is about 65%-92%.

[0059] By comparison, the presence of ozone can effectively reduce the catalytic reaction temperature of benzene...

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Abstract

The invention discloses a device and a method for treating organic waste gas by catalysis and ozonation. The method comprises the following steps: (1) the organic waste gas is collected and enters a pretreater, the waste gas is pretreated and oil drops, particulate matter, acid etchant gas and fog drops in the waste gas are intercepted; (2) after the pretreated organic waste gas is pressurized by an induced draft fan, the organic waste gas enters the cold end of a heat exchanger to be preheated; (3) the preheated organic waste gas enters a catalytic oxidation device, the organic waste gas entering the catalytic oxidation device is warmed up and then is mixed with ozone fed into the catalytic oxidation device, and the mixed gas enters a catalytic oxidation reaction region of the catalytic oxidation device to be subjected to the catalytic oxidation reaction so as to remove organic pollutants; (4) the purified gas serving as a heat source enters the hot end of the heat exchanger in the step (2) to be subjected to heat exchange and the gas subjected to heat exchange is discharged by an exhaust pipeline. When being combined with the treatment device disclosed by the invention, the treatment method disclosed by the invention has a better purifying effect on the waste gas and not only ensures purifying efficiency of the waste gas, but also is energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a treatment device and a treatment method for catalytic ozone oxidation of organic waste gas. Background technique [0002] In recent years, the environmental pollution caused by the discharge of organic waste gas and its serious harm to human health have increasingly become the focus of attention of governments at all levels and the public, and more and more people pay more and more attention to efficient and simple organic waste gas treatment methods. [0003] At present, the common methods for treating organic waste gas at home and abroad include adsorption method, absorption method, plasma method, incineration method and catalytic oxidation method. However, the adsorption method has disadvantages such as high cost and saturated adsorption of the adsorbent; the absorption method needs to select a suitable chemical agent, and the reaction conditions of the chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/76
Inventor 陆建海朱虹顾震宇
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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