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Waste water recycling device and method in VOCs waste gas recovery process

A waste gas recovery and waste water technology, applied in chemical instruments and methods, combined devices, separation methods, etc., can solve the problems of running costs, waste of water resources, etc., and achieve the advantages of saving steam consumption, compact process, and improving the recovery rate of organic solvents. Effect

Inactive Publication Date: 2016-05-11
QUANZHOU TIANLONG ENVIRONMENTAL ENG
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  • Application Information

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Problems solved by technology

However, the residual aqueous solution after separation still contains a small amount of organic solvents. Wastewater treatment requires the construction of wastewater treatment facilities, operating costs, and waste of water resources.

Method used

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  • Waste water recycling device and method in VOCs waste gas recovery process

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Embodiment Construction

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited.

[0020] A waste water reuse device in the process of VOCs waste gas recovery, including a paint mist purification system 1, a fan 2, an activated carbon adsorption / desorption tank 3, a condenser 4, an oil-water separator 5, a balance tank 6, a feed pump 7, and a drop tank Membrane separator 8, falling film evaporator 9, steam distribution cylinder 10, circulation pump 11, also includes a PLC automatic control system for regulating the above-mentioned components; wherein VOCs waste gas first enters the paint mist purification system 1 to remove paint residue The final exhaust gas is sent to the activated carbon absorption / desorption tank 3 through the fan 2 for adsorption, and the desorbed organic solvent vapor and water vapor enter the condenser 4 to be cooled into a liquid state, and then sent to the oil-w...

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Abstract

The invention relates to a waste water recycling device and method in the VOCs waste gas recovery process. Waste water produced when VOCs waste gas of spray-coating work passes through a mist purifying system (1), a draught fan (2), an active carbon adsorption / desorption tank (3), a condenser (4) and an oil-water separator (5) is evaporated and concentrated through a falling film evaporator (9), a concentrated solution evaporated through the falling film evaporator (9) enters a falling film separator (8) and is sent into the falling film evaporator (9) through a circulating pump (11) to be circulated and evaporated. Separated waste water containing a small amount of organic solvent is recycled, water resources are saved, sewage discharge can be reduced, and the aim of waste water comprehensive treatment in the VOCs waste gas recovery process is achieved.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a waste water reuse device and method. Background technique [0002] A large amount of volatile organic compounds, referred to as VOCs (Volatile Organic Compounds) are produced in the painting operation. In industrial production, they are usually used as solvents and released into the atmosphere after use. If these organic solvents volatilize into the atmospheric environment, they will not only cause serious pollution to the atmospheric environment, but also cause harm to human health after the human body breathes in the polluted gas. For example, benzene is often used as a solvent. As a solvent, it volatilizes into the atmosphere. It can not only be absorbed by the skin of the human body, but also enter the human body through the respiratory system, causing chronic or acute poisoning. At present, most of the activated carbon adsorption method is used to recover and reuse th...

Claims

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Application Information

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IPC IPC(8): B01D50/00B01D5/00B01D53/00B01D53/02C02F9/10
CPCB01D53/002B01D53/02C02F9/00C02F2201/007C02F1/40C02F1/08B01D2253/102B01D2257/708B01D2258/0258B01D50/20
Inventor 傅金栋傅志森傅太平黄平傅汉文
Owner QUANZHOU TIANLONG ENVIRONMENTAL ENG