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Method and device for treating VOCs (Volatile Organic Chemicals) waste gas

A waste gas and pretreatment technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve problems such as high operating costs, secondary pollution, and large floor space, and achieve low one-time investment and no secondary pollution. The effect of secondary pollution and small footprint

Inactive Publication Date: 2014-09-10
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional methods have their own defects, which limit the wide-scale promotion and use.
The absorption and adsorption methods have the problem of secondary pollution of old absorbents and old adsorbents, and the replacement of absorbents and absorbents is frequent, resulting in high daily operating costs; the characteristics of large one-time investment and high operating costs of the catalytic combustion method also limit small and medium-sized enterprises. The use of biological methods to remove VOCs occupies a large area, and the removal rate is easily affected by factors such as exhaust gas concentration and exhaust gas toxicity. Under many working conditions, the exhaust gas after treatment cannot meet the emission standards

Method used

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  • Method and device for treating VOCs (Volatile Organic Chemicals) waste gas
  • Method and device for treating VOCs (Volatile Organic Chemicals) waste gas

Examples

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Effect test

Embodiment 1

[0041] A Gearbox Group Co., Ltd. in Hangzhou used improved cashew nut phenolic resin in a certain process, which would produce strong odorous exhaust gas, which would deteriorate the working environment of the workshop and seriously affect the living environment of the surrounding residents. According to the information provided by the owner and on-site measurement, design 40000m 3 / h air volume VOCs treatment project. The treatment process is as follows: the pretreatment tower adopts swirl plate tower, and the absorption liquid adopts clean water. Stainless steel wire mesh mechanical filtration is used in the demister. The absorption liquid in the swirl plate column after the plasma purifier adopts NaOH solution. Such as Figure 5As shown, when the voltage in the plasma purifier is 37.5kV and the pH of the absorbing liquid in the swirling plate tower is 10, the removal rate of malodorous exhaust gas is 80%. According to the third-party test, the average outlet concentratio...

Embodiment 2

[0043] Zhejiang XX Industrial Co., Ltd. is a large-scale listed company that produces and sells stage machinery. During the production process, the spray booth produces a large amount of spray exhaust gas, which seriously affects the health of the surrounding residents. The length × width × height of the spray booth is about 20000mm × 5000mm × 4000mm, and the design area is 50000m 3 / h air volume spray paint waste gas treatment project. The process flow of spray paint exhaust gas treatment is as follows: after spray paint exhaust gas is collected, it enters the paint mist pretreatment tower, the paint mist pretreatment tower adopts a swirl plate tower, and the absorption liquid uses clean water. After being treated by the pretreatment tower, more than 95% of the paint mist is removed. The exhaust gas enters the demister again, and a stainless steel wire mesh filter layer is set in the demister to remove trace amounts of paint mist and water vapor. After the exhaust gas is t...

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Abstract

The invention discloses a method and a device for treating VOCs (Volatile Organic Chemicals) waste gas. The device mainly comprises an air inlet, a pretreatment tower, an air tube, a fire resisting damper, a demister, a VOCs concentration monitoring system, a plasma purifier, a temperature measuring and control alarm system, a fan, a rotational flow plate tower, an exhaust cylinder and an air hood. According to the method, the industrial VOCs waste gas is collected and subsequently fed into the pretreatment tower; in the pretreatment tower, clean water is adopted to reduce the temperature and remove dust of the waste gas; the waste gas after the pretreatment is demisted and fed into the plasma purifier; high activity particles are generated in the plasma purifier, reacts with VOCs molecules in the waste gas, and are finally degraded into carbon dioxide and the water. Part of organic matters is not completely degraded in plasmas so as to generate micromolecule organic acid and aerosol. The waste gas is further absorbed by an alkali liquid in the rotational flow plate tower to remove secondary pollutants. After the industrial VOCs waste gas is treated by using the device, the high altitude up-to-standard emission can be achieved.

Description

technical field [0001] The invention relates to the technical field of chemical adsorption separation and pollutant control, in particular to a method and device for treating organic waste gas (VOCs) waste gas. Background technique [0002] In recent years, the number and duration of large-scale haze outbreaks in China have increased year by year, seriously affecting the health and quality of life of the people. Haze is very harmful and has a wide range of influence. It has become one of the main problems affecting the quality of China's atmospheric environment today, and it is also the atmospheric environmental issue that the people are most concerned about. [0003] A large amount of industrial volatile organic pollutants (VOCs), nitrogen oxides, sulfur dioxide, and vehicle exhaust are the main reasons for the formation of haze. Domestic industrial dust, sulfur dioxide and nitrogen oxides have introduced strict standards to control emissions. The governance of VOCs is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D47/00B01D47/14B01D53/78B01D53/40B01D53/32
CPCY02P70/10
Inventor 陈杰
Owner HANGZHOU DIANZI UNIV