Apparatus for treating organic exhaust gas

Abstract

The invention provides an apparatus for treating organic exhaust gas. The apparatus comprises a pretreatment unit, a membrane treatment unit, and a demisting unit; wherein the pretreatment unit comprises the following components: an exhaust gas inlet, an exhaust gas outlet, a first packing layer, a second packing layer, a leaching nozzle and liquid; the membrane treatment unit comprises a compressor, a condenser and a membrane module; the demisting unit comprises a gas inlet, a gas outlet, and a third packing layer; the exhaust gas outlet of the pretreatment unit is connected to the compressor through a pipeline; gas purified by the membrane module of the membrane treatment unit is connected to the demisting unit through the gas inlet; an outlet of the compressor is connected to an inlet of the condenser through a pipeline, and the outlet of the condenser is connected to an inlet of the membrane module through a pipeline. The apparatus for treating organic exhaust gas has the advantages of simple structure and operation convenience, and effectively improved purifying rate of volatile organic compounds.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a device for treating organic waste gas. Background technique [0002] In industrial production, most products or raw materials use organic compounds, so there is a problem of volatile organic compounds (VOCs) emissions. Most VOCs are toxic, have foul smell or irritating smell, are flammable and explosive, and some VOCs are carcinogenic, which are important sources of environmental pollution and are also harmful to people's health. At present, the main treatment methods for the treatment of such pollutants include: [0003] 1. Catalytic combustion method: refers to the combustion of organic waste gas at a temperature of 300-400 ° C under the catalytic action of a catalyst. This method mostly uses precious metal catalysts such as platinum with high heat resistance and anti-toxicity performance to ensure the activity of the catalyst, and the cost is high; ...

AI Technical Summary

Problems solved by technology

This method mostly uses precious metal catalysts such as platinum with high heat resistance and anti-toxicity performance to ensure the activity of the catalyst, and the cost is high; the organic waste gas must be preheated during combustion treatment to maintain the catalytic combustion temperature, which can High consumption and high operating costs; at the same time, the combustion temperature must be strictly controlled to prevent the production of other harmful substances during incineration, which not only puts forward more requirements on the technology of the incinerator itself, but also makes it difficult to absolutely ensure that no secondary pollutants are produced; incineration There is also a potential danger of explosion, especially with volatile combustible gases

[0004] 2. Absorption method (water absorption method, acid absorption method, alkali absorption method): the principle of this type of method is to collect and transfer organic pollutants, and does not effectively treat organic waste gas

When using the strong oxidation of ozone, excessive ozone must be introduced, and excessive ozone will be discharged into the air along with exhaust gas, which will cause great harm to human health; and the ozone generator needs to generate ozone under the action of strong voltage , under the action of strong voltage, the ozone generating equipment is easy to generate electric sparks, which has hidden fire safety hazards; and in the process of strong oxidation, the products of the oxidation reaction are uncertain, and it is easy to generate new and more difficult secondary Pollutants

[0007] 5. Biological method: biological purification is essentially an oxidative decomposition process: active microorganisms attached to porous and moist media use organic components in exhaust gas as energy or nutrients for their life activities, and convert them into simple inorganic substances or cell components ; When using biological methods to treat waste gas, different biological treatment devices need to be used for different amounts of purified gas and different concentrations of waste gas, and the biological treatment devices used need regular maintenance and maintenance, which increases production costs

[0009] However, there are still some deficiencies in the membrane treatment methods for volatile organic waste gas on the market at present, which makes the concentration of the waste gas when it enters the membrane module too high, causing damage to the membrane and reducing the service life of the membrane

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