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System and technology for processing low-concentration VOCs (volatile organic chemicals) waste gas

A low-concentration, waste gas technology, applied in the direction of vapor condensation, chemical instruments and methods, separation methods, etc., can solve problems such as difficulty in comprehensive treatment of VOCs, and achieve the effect of highly automated operation

Inactive Publication Date: 2012-11-28
JIANGSU WISDOM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Practice has proved that it is difficult to achieve the comprehensive treatment effect of VOCs (total hydrocarbon discharge and organic component recovery) through a single process technology

Method used

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  • System and technology for processing low-concentration VOCs (volatile organic chemicals) waste gas
  • System and technology for processing low-concentration VOCs (volatile organic chemicals) waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Low-concentration VOCs waste gas treatment system

[0027] Low-concentration VOCs exhaust gas treatment system, the system includes: fan 1 that sends exhaust gas, fan 1 and adsorption device 2 are connected through an air guide pipe, and a switchable gas exhaust pipe is drawn from the top of the adsorption device 2; vacuum pump 3 passes through a switchable guide pipe. The gas pipeline connects the inlet port of the adsorption device 2 and the membrane separator 4, and the outlet port of the membrane separator 4 leads to two gas guide pipelines, one is connected to the precooler 5, and the other is connected to the inlet of the blower fan 1; Both ends are connected to the pre-cooler, and three air guide pipes are drawn from the bottom of the condenser 6, two of which are connected to RFG7 as air inlet and outlet pipes, and the other is connected to the collection tank 8; the other end of RFG7 leads to two pipes, which are respectively used as circulating cool...

Embodiment 2

[0028] Embodiment 2 low-concentration VOCs exhaust gas treatment process

[0029] (1) Use fan 1 to send low-concentration VOCs waste gas in the sewage pool to adsorption device 2 for initial concentration, after purification, the gas is emptied, and the adsorption is stopped when the adsorption of the adsorbent reaches saturation, and desorption is performed by vacuuming with vacuum pump 3;

[0030] (2) The desorbed gas is sent to the membrane separator 4 for secondary concentration, the permeated gas enters the condensation system, and the residual gas returns to the fan 1 inlet;

[0031] (iii) The permeated gas that has been enriched for the second time is pre-cooled and lowered through the pre-cooler 5, and then sent to the condenser 6 for condensation. The light hydrocarbons obtained from the condensation enter the collection tank 8 and are collected and returned to the production system. The non-condensable gas is used as a pre-cooler 5 cold source, its cooling capacity...

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Abstract

The invention provides a system and technology for processing low-concentration VOCs (volatile organic chemicals) waste gas. In the invention, the adsorption technology, the membrane separation technology and the condensation technology are combined, wherein the VOCs waste gas is subjected to primary concentration by the adsorption technology and secondary concentration by the membrane separation technology, and the VOCs waste gas after concentration is condensed by the condensation technology; and the aim of saturation precipitation of organic components can be achieved with relatively little consumption of cold. The system and technology provided by the invention integrate the adsorption technology, the membrane separation technology and the condensation technology, and are mainly used for processing the VOCs waste gas in the occasions with relatively low concentration such as the truck loading process of oil products and chemical products, storage tanks, sewage pools and the like; and the processed waste gas can meet the requirements of the effluent gas emission standard of the country.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a system and process for treating low-concentration VOCs waste gas. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, hereinafter referred to as VOCs) are the most common pollutants emitted by petrochemical, pharmaceutical, printing, shoemaking, painting and other industries. With the development of industry and the improvement of people's living standards, the emission of VOCs is increasing day by day, and has the characteristics of wide range and large emission. Most of these organic substances are toxic and can participate in photochemical reactions to form photochemical smog, which is an important condition for the formation of secondary particulate organic substances in the atmosphere and has a serious impact on the atmospheric environment and human health. Therefore, research on the comprehensive treatment of VOCs exhaust gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01D53/22B01D5/00
Inventor 孙立宇潘永涟李翠屏陈慧如胡秀高
Owner JIANGSU WISDOM ENG TECH
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