Method and device for recycling VOC in low-concentration VOC-containing mixed gas

A technology of mixed gas and recovery method, which is applied in the fields of energy saving and environmental protection, and can solve problems such as complex process, secondary pollution, and bulky processing equipment, and achieve the effects of reducing volume, good adsorption capacity, and increasing the gas-liquid contact area

Active Publication Date: 2015-04-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-concentration organic waste gas can be treated by chemical methods, such as combustion, catalytic oxidation, etc. These methods are prone to secondary pollution and cannot recover organic matter in the gas
Traditional physical methods such as adsorption, condensation, liquid absorption, etc., can recover organic matter in the gas and are widely used, but the treatment efficiency for low-concentration waste gas is low, and the required processing equipment is bulky
[0003] The traditional absorption method to recover VOC in gas is limited by the gas-liquid mass transfer area per unit volume, and it is difficult to achieve high-efficiency absorption. The microbubble absorption device greatly increases the gas-liquid contact area per unit volume through microbubble technology. Mass transfer efficiency, reduce the volume of the absorber; the method of adsorption and regeneration mostly adopts the saturated water vapor desorption method, which obtains the VOC aqueous solution, and then recovers the VOC by rectification or extraction
This desorption method has many steps, high energy consumption and complex process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, in the mixed gas containing VOC, VOC includes acetone, ethyl acetate and ethanol, wherein the content of acetone is 2500ppm, the content of ethyl acetate is 1300ppm, and the content of ethanol is 800ppm, the temperature is 45°C, and the gas flow rate is 50-100 L / h;

[0030] The conditions of the microbubble absorption device: the operating temperature is 25°C, the operating pressure is 0.09 MPa (absolute pressure), polyethylene glycol (PEG) is used as the absorbent, the volume of the absorbent in the absorption device is 0.5 L, and the height of the absorbent bed is controlled at 57 -63cm, gas holdup 25-27%, intermittent operation, operating time 30 minutes, after the mixed gas passes through the microbubble absorption device 3, the gas temperature drops, the outlet gas temperature is 27-29℃, and the acetone content in the outlet gas is 560-1070ppm , the content of ethyl acetate is 370-590ppm, the content of ethanol is 80-120ppm, the operating temperat...

example 2

[0036] The VOC-containing mixed gas of this embodiment: the content of acetone is 5000 ppm, the content of ethyl acetate is 3500 ppm, the temperature of the mixed gas is 50° C., and the gas flow rate is 50-100 L / h.

[0037] Microbubble absorption device: operating temperature 27°C, operating pressure 0.08Mpa (absolute pressure). - Cyclodextrin-sodium dodecylbenzenesulfonate compound surfactant solution (0.5g per liter of solution - Cyclodextrin and 0.2g sodium dodecylbenzenesulfonate, the solvent is water) as absorbent, the absorbent volume in the absorption device is 0.6 L, the absorbent bed height is 55±3cm, and the gas holdup rate is 27-31%, Interval operation, the operation time is 30 min. The mixed gas passes through the microbubble absorption device, the gas temperature drops, the outlet gas temperature is 33-35°C, the acetone content of the outlet gas is 790-1320 ppm, and the ethyl acetate content is 780-1190 ppm. The operating temperature of the flash evaporator is...

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PUM

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Abstract

The invention discloses a method and a device for recycling VOC in low-concentration VOC-containing mixed gas and belongs to the technical fields of energy conservation and environmental protection. The VOC gas is recycled from the low-concentration VOC mixed gas under the conditions of the absolute pressure of 0.08-0.5MPa and the temperature of 20-60 DEG C below zero by adopting a bubble absorption-adsorption and enrichment combined mode, the problems that the traditional low-concentration VOC-containing mixed gas process is complex, the equipment is large and the recycling cost is high are solved, the absorber volume and operation retention time can be reduced, low-cost environment-friendly treatment of the low-concentration VOC-containing mixed gas is realized, the total treatment rate of the VOC is over 90 percent, and the total recovery rate is over 50 percent.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection, and in particular relates to an energy-saving method and device for recovering VOC in low-concentration VOC-containing mixed gas, which reduces transmission and residence time, has low pressure drop, and is suitable for processing low-concentration VOC waste gas. Background technique [0002] Exhaust gas containing volatile organic compounds (VOC) is harmful to the atmosphere, environment and human health. Low-concentration organic waste gas can be treated by chemical methods, such as combustion, catalytic oxidation, etc. These methods are prone to secondary pollution and cannot recover organic substances in the gas. Traditional physical methods such as adsorption, condensation, liquid absorption, etc., can recover organic matter in the gas and are widely used, but the treatment efficiency for low-concentration waste gas is low, and the required processing equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00B01D53/18B01D53/14B01D53/02
Inventor 沈绍传李琰君张小波贠军贤姚克俭
Owner ZHEJIANG UNIV OF TECH
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