Resourcable volatile organic tail gas treating method and skid-mounted moving device

A volatile organic and tail gas treatment technology, applied in the field of soil remediation, can solve the problems of waste of energy consumption, complex activated carbon treatment, limited adsorption capacity, etc. Effect

Active Publication Date: 2013-12-25
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adsorption method (Patent No. CN201210334393.0) can recover pollutants, and its process mostly uses activated carbon adsorption technology, but its adsorption capacity is limited, generally only used for VOCs tail gas treatment with low pollutant concentration, and the moisture in the tail gas will also make the adsorption The effect is reduced, and the post-treatment of activated carbon after adsorbing pollutants is complicated
The advantage of thermal oxidation technology[1] is that the tail gas is completely oxidized and decomposed, and the post-treatment is simple, but the pollutants have not been recovered and recycled. Although this method can be used for tail gas treatment with high pollutant concentration, the cost of heat treatment is high, and the electric power control The cost increases, and it may produce acid gas and increase greenhouse gas emissions, causing secondary pollution, and the equipment life is short
Membrane separation method (Patent No. CN200820178507.6) has low operating costs for tail gas treatment, but the equipment occupies a large area, the treatment cycle is long, and there is also the problem that pollutants cannot be recycled.
Other separation methods, such as the compression condensation method, because the air in the tail gas accounts for more than 95%, a lot of energy is wasted on compressing and cooling air; the photolysis method is suitable for low-concentration tail gas; and the plasma treatment method is currently immature, and organic pollutants not recyclable

Method used

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  • Resourcable volatile organic tail gas treating method and skid-mounted moving device
  • Resourcable volatile organic tail gas treating method and skid-mounted moving device
  • Resourcable volatile organic tail gas treating method and skid-mounted moving device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] To treat a high-concentration tail gas containing pollutants benzene, toluene, and p-xylene, the gas flow rate is 90ml / min, and the triethylene glycol reagent containing less than 5% impurities is used for spraying treatment. The temperature of the spray chamber is 25°C, operated under normal pressure, and the process results obtained after spraying are shown in Table 3:

[0034] Table 2 process results

[0035]

Embodiment 2

[0037] The concentration of pollutants in the tail gas extracted by the gas phase extraction device is about 1.5%, and the extraction flow rate is 500m 3 / h. According to the operating conditions, the temperature of the spray chamber is 30°C, the absolute pressure is 500Kpa, and the size is 400mm×600mm×4000mm; the temperature of the separation chamber is 80~210°C, the absolute pressure is 6Kpa, the size is 600mm×800mm×3500mm; the temperature of the adsorption chamber is 30°C, pressure 110Kpa, size 400mm×400mm×3500mm; condenser temperature 80°C, cryocooler temperature -60°C, spray agent cooling temperature 30°C. Process obtains result as following table 2:

[0038] Table 3 process results

[0039]

[0040] The content of organic pollutants in the gas before treatment is 11.4kg / h, and the recovered organic matter after system treatment is 11kg / h, and the recovery rate of pollutants is 96.5%.

Embodiment 3

[0042] To deal with heavy component pollutants from benzene processing, the concentration of pollutants in the tail gas extracted by the gas phase extraction device is about 0.8%, and the extraction flow rate is 500m 3 / h. According to the operating conditions, the temperature of the spray chamber is 30°C, the absolute pressure is 200Kpa, and the size is 500mm×600mm×4000mm; the temperature of the separation chamber is 80~206°C, the absolute pressure is 6Kpa, the size is 600mm×800mm×3500mm; the temperature of the adsorption chamber is 20°C, pressure 110Kpa, size 400mm×400mm×3500mm; condenser temperature 80°C, cryocooler temperature -20°C, spray agent cooling temperature 30°C. Process obtains result as following table 2:

[0043] Table 4 process results

[0044]

[0045]

[0046] The content of organic pollutants in the gas before treatment is 6.5kg / h, and the recovered organic matter after system treatment is 6.21kg / h, and the recovery rate of pollutants is 95.5%.

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Abstract

The invention relates to a resourcable volatile organic tail gas treating method. According to the method, tail gas containing VOCs enters into a gas-liquid separator at first; then a separated gas phase enters into a spray chamber through the output end of a fan for treatment; gas without pollutants is discharged into an adsorption chamber from the top of the spray chamber for further purification and is then discharged into the atmosphere; a spraying agent rich solution is discharged from the bottom of the spray chamber and enters into a separation chamber after heat exchange in a heat exchanger; an organic pollutant mixed gas phase is emitted from the top of the separation chamber, carries a part of a spraying agent for condensation when passing through a condenser and then returns to the separation chamber, and the rest uncondensed gas phase is condensed by a deep freezer and then recovered to a pollutant storage tank; a vacuum adjusting system is arranged behind the deep freezer; the low part of the separation chamber is connected with a heating pot; a spraying agent lean solution obtained after thermal separation is conveyed by a pump to the spray chamber for cyclic usage after cooled by the heat exchanger. The treating method has wide applicability and can be used to treat high-low concentration VOCs tail gas in places with different pollution degrees; and a skid-mounted structure of an apparatus can be moved according to needs at a pollution site.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a resource-recyclable volatile organic tail gas treatment method and a skid-mounted mobile device of the organic polluted soil remediation technology. Background technique [0002] Soil Vapor Extraction (SVE), Air Sparging (AS), Dual-Phase Extraction (DPE) and Multi-Phase Extraction (MPE) are Effective in-situ remediation technologies for the treatment of volatile organic pollutants in soil or groundwater have been vigorously promoted and promoted by the US Environmental Protection Agency (EPA). Environmental remediation techniques. [0003] The above technologies ultimately require the extraction of volatile organic pollutants (VOCs) in unsaturated soil or groundwater areas to the ground for further treatment. The mixture of volatile or semi-volatile organic compounds and air and water vapor that is pumped to the ground is called tail gas. At home and abroad, there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18
CPCB01D53/75B01D53/1487B01D53/44B01D53/78B01D53/82B01D2257/708B09C1/005
Inventor 隋红李喜青熊忠张涛李鑫钢董文威
Owner TIANJIN UNIV
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