Method and device for recycling and treating waste gas with VOCs (volatile organic compounds)

Abstract

The invention relates to a method and a device for recycling and treating waste gas with VOCs (volatile organic compounds). The device comprises an adsorption unit, an absorption unit and a rectification unit. The adsorption unit is used for adsorbing the VOCs, the absorption unit is used for absorbing the VOCs, and the rectification unit is used for recycling the VOCs and regenerating absorbents. The method and the device for recycling and treating the waste gas with the VOCs have the advantages that the VOCs absorption efficiency can be improved, loss of the absorbents can be reduced, and the VOCs further can be recycled; energy consumption in production procedures can be effectively reduced, and accordingly the production cost can be saved to a great extent.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method and device for recovering and treating VOCs waste gas. Background technique [0002] During the production process of the industrial industry, a large amount of waste gas containing VOCs will be generated. If these waste gases are directly discharged into the atmosphere, it will not only cause air pollution, but also lead to waste of materials and increase production costs. In recent years, VOCs emission control work has been carried out in various places. Commonly used VOCs treatment technologies include combustion method, biological method, absorption method, adsorption method, luminescent catalytic method, etc. Among them, the adsorption method has simple operation process, easy automatic control, VOCs can be recycled, adsorption materials can be recycled and reused, and are widely used by enterprises. [0003] However, in the VOCs recovery process, ...

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Problems solved by technology

[0003] However, in the VOCs recovery process, the original steam desorption and direct nitrogen desorption (without using non-condensable gas purification process) technology has the following disadvantages: ①The amount of steam used during steam desorption is large, and a large amount of waste water is formed after desorption is completed , requires secondary treatment, and steam condensed water will take away a large part of the solvent, resulting in waste of raw materials; ②Due to the high saturated vapor pressure of VOCs when nitrogen is directly desorbed, if you want to make the VOCs in the desorbed gas be extremely large by condensation The temperature required for partial liquefaction is low, resulting in high energy consumption for condensation, complex process, and harsh conditions; ② When nitrogen is directly desorbed, the non-condensable gas after condensing to room temperature still contains about 15% to 18% of VOCs, resulting in desorption of the adsorber. Incomplete attachment, incomplete regeneration of adsorption materials, secondary adsorption of recovered VOCs causes waste of energy and VOCs, neither energy saving nor secondary pollution of gas, resulting in this technology has not been recognized by enterprises, so adsorption recovery technology urgently needs technical support develop to solve the above problems

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