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Method and device for treating and recycling organic exhaust gas with low concentration and large air volume

A technology for organic waste gas and recovery methods, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, which can solve the problems of limited air volume, low concentration, high investment, etc., achieve efficient adsorption treatment and recovery, and have a reasonable device structure , low cost effect

Inactive Publication Date: 2013-12-25
中节能天辰(北京)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when the air volume of organic waste gas is large (50000m 3 / h above), low concentration (mainly 300-800mg / m 3 When there are various types of solvents, the air flow rate is greatly limited due to the resistance and strength characteristics of the adsorbent material itself, the overall equipment required is very large in scale, the investment is high, and the operation and maintenance costs are too high
The use of saturated water vapor desorption method needs to consider solvent refining, wastewater treatment requirements and water vapor implementation conditions, which restricts the promotion of treatment technology

Method used

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  • Method and device for treating and recycling organic exhaust gas with low concentration and large air volume
  • Method and device for treating and recycling organic exhaust gas with low concentration and large air volume
  • Method and device for treating and recycling organic exhaust gas with low concentration and large air volume

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Embodiment 1

[0041] Such as image 3 As shown, this preferred embodiment provides a low-concentration and high-volume organic waste gas treatment and recovery device, which includes an adsorption system and a desorption system. The adsorption system includes three pretreatment devices 3 , three honeycomb activated carbon adsorbers 2 , and an exhaust fan 1 . Each pretreatment device 3 corresponds to an independent honeycomb activated carbon adsorber 2 (all adsorbers 2 can also share a set of pretreatment device 3), and the air inlet and outlet of the honeycomb activated carbon adsorber 2 are equipped with airtight valves.

[0042] The desorption system includes a nitrogen generator 20, a first end of a heat exchanger 51, a surface cooler 8, a condensation unit, a circulating fan 4, a second end of a heat exchanger 52, and a heater 6 connected in sequence through pipelines, and two A secondary adsorber 7. One end of the secondary adsorber 7 is connected to the gas outlet of the nitrogen ge...

Embodiment 2

[0057] The device used in this preferred embodiment includes an adsorption system and a desorption system. The adsorption system uses honeycomb activated carbon as the adsorbent, and the desorption system uses hot nitrogen as the desorption gas.

[0058] Workflow: Use honeycomb activated carbon as the adsorbent to adsorb the solvent in the organic waste gas, and use hot nitrogen to desorb the adsorbent when the solvent in the adsorbent reaches the set saturation value. The hot nitrogen continues to circulate after desorbing the adsorbent; when the solvent contained in the hot nitrogen reaches the condensed state at room temperature, the solvent in the hot nitrogen is condensed and recovered.

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Abstract

The invention discloses a method and device for treating and recycling an organic exhaust gas with low concentration and large air volume, which is designed for solving the problem that the existing method and device cannot be used for treating the organic exhaust gas with low concentration and large air volume well. The method for treating and recycling organic exhaust gas with low concentration and large air volume disclosed by the invention comprises the following steps of: adsorbing a solvent from the organic exhaust gas by using honeycomb active carbon as an adsorbent; and carrying out desorption on the adsorbent by using a hot nitrogen gas when the solvent in the adsorbent reaches a set saturation value. The device disclosed by the invention comprises an adsorbing system which uses the honeycomb active carbon as the adsorbent and a desorption system which uses the hot nitrogen gas as a desorption gas. The method and device for treating and recycling organic exhaust gas with low concentration and large air volume disclosed by the invention have a reasonable structure and low cost, are suitable for treating and recycling organic exhaust gases with low concentration and large air volume of various solvents, and especially suitable for recycling an organic solvent with a high boiling point and volatility.

Description

technical field [0001] The invention relates to a method and device for treating and recovering low-concentration and high-volume organic waste gas. Background technique [0002] Several industries, including automobile spraying, printing, coating, etc., will produce organic waste gas. If not handled well, the discharge of these organic waste gases will pollute the atmospheric environment. [0003] At present, the treatment methods of organic waste gas mainly include absorption, adsorption purification, adsorption recovery, catalytic incineration, thermal storage incineration, ionization cracking, etc. When recycling, the treatment method of adsorption recovery is basically adopted. The adsorbent in the adsorber is mostly columnar activated carbon and activated carbon fiber. After the adsorption solvent reaches a certain degree of saturation, water vapor is used to desorb the adsorbent. [0004] The above-mentioned method can obtain relatively good treatment effects and be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04
Inventor 周长龙张建军王进军
Owner 中节能天辰(北京)环保科技有限公司
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