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Method and equipment for processing exhaust gases of volatile organic compounds

An organic compound and volatile technology, applied in the field of volatile organic compound waste gas treatment, can solve the problems of difficult treatment, expensive equipment, catalyst, limited treatment capacity, etc., and achieve flexible equipment, good economic and environmental benefits, and flexible assembly Effect

Inactive Publication Date: 2015-03-25
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the volatility and complex composition of VOCs, it brings great difficulty to processing
At present, there are mainly methods for dealing with VOCs: adsorption method, which mainly deals with low-concentration VOCs waste gas, with high operating costs, limited processing capacity, and high regeneration cost of adsorbents; combustion method, direct combustion, regenerative combustion, catalytic combustion, etc. There are problems of insufficient combustion or secondary pollution caused by sulfur in the original exhaust gas, and the concentration of VOCs exhaust gas should not be too high, and the equipment and catalyst are more expensive; the corona method is a low-cost control for treating low-concentration pollutants technology, due to the stability of the long-term operation of the reactor and the low catalytic efficiency, this method has not yet been practically applied and commercialized; the condensation method is to condense part of the composition into a liquid by cooling down to supersaturation. The condensation method has great restrictions on the composition of VOCs, and it is difficult to meet the atmospheric emission standards

Method used

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  • Method and equipment for processing exhaust gases of volatile organic compounds
  • Method and equipment for processing exhaust gases of volatile organic compounds
  • Method and equipment for processing exhaust gases of volatile organic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1-VOCs exhaust gas treatment from a contaminated soil gas phase extraction:

[0051] In this example, the VOCs exhaust gas 1 (500NM 3 / hr), its total concentration after testing is as high as 25100ppm. The VOCs exhaust gas 1 enters the gas compressor C2 through the blower C1. The outlet pressure of C2 is 1MPa and the temperature is 50°C; the gas compressor outlet stream 3 is cooled to 5°C through the precooler F1 and then enters the direct contact deep cooling tower T1. The T1 pressure of the direct contact deep cooling tower is 1MPa, and the liquid phase inlet stream 9 of the direct contact deep cooling tower is the starting refrigerant (refrigerant flow) at -45°C. At the bottom, the bottom of the tower is generated after the starting refrigerant contacts with VOCs Part of the liquid organic matter enters the waste liquid collection tank V1, and a part of the waste liquid is reserved to enter the cryocooler F2 and is cooled to -45°C as the starting refrigerant. T...

Embodiment 2

[0055] Example 2-Treatment of VOCs discharged from a refinery:

[0056] In this example, the VOCs exhaust gas 1 (1000NM 3 / hr), its total concentration after detection is as high as 15100ppm. The VOCs exhaust gas 1 enters the gas compressor C2 through the blower C1. The outlet pressure of C2 is 2MPa and the temperature is 75°C; the gas compressor outlet stream 3 is cooled to 0°C through the precooler F1 and then enters the direct contact deep cooling tower T1. The T1 pressure of the direct contact deep cooling tower is 2MPa, and the liquid phase inlet stream 9 of the direct contact deep cooling tower uses the starting refrigerant (refrigerant flow) at -85℃. At the bottom, the bottom of the tower is produced after the starting refrigerant contacts with VOCs. A part of the liquid organic matter enters the waste liquid collection tank V1, and a part of the waste liquid is reserved to enter the cryocooler F2 and is cooled to -85°C as the starting refrigerant. The temperature of the ...

Embodiment 3

[0060] Example 3-Treatment of VOCs discharged by a printing company:

[0061] In this example, a printing company’s VOCs exhaust gas 1 (1000NM 3 / hr), after testing the total concentration is as high as 26600ppm, the VOCs exhaust gas 1 enters the gas compressor C2 through the blower C1, the outlet pressure of C2 is 0.5MPa, and the temperature is 30℃; the gas compressor outlet stream 3 is cooled to by the precooler F1 After 22.5℃, enter the direct contact deep cooling tower T1. The pressure of the direct contact deep cooling tower T1 is 0.5MPa. The liquid phase inlet stream 9 of the direct contact deep cooling tower is the starting refrigerant (refrigerant flow) at -20℃. At the bottom, a part of the liquid phase organics at the bottom of the tower produced after the starting refrigerant contacts with VOCs enters the waste liquid collection tank V1, and a part of the waste liquid is reserved to enter the cryocooler F2 and be cooled to -20°C as the starting refrigerant. The temperat...

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Abstract

The invention provides a method and equipment for processing exhaust gases of volatile organic compounds. In the method, the processes of compression-direct cooling-adsorption are integrated, and the method can be used for processing exhaust gases, with a plurality of concentrations, of the volatile organic compounds. According to the method, a direct-contact depth cooling device adopting gas-liquid direct contact is adopted in the direct cooling condensation process; and cooling liquid waste is utilized as refrigerant liquid, so that the cost is reduced, and the efficiency is improved.

Description

Technical field [0001] The invention relates to the field of exhaust gas treatment of volatile organic compounds (Volatile Organic Compounds, VOCs), and in particular to a method and equipment for treating exhaust gas of volatile organic compounds. Background technique [0002] Volatile organic compounds (VOCs) are an important type of air pollutants. They usually refer to the normal pressure boiling point of 50~260℃, and their main components are aliphatic hydrocarbons, halogenated hydrocarbons, aromatic hydrocarbons, polycyclic aromatic hydrocarbons, alcohols, and aldehydes. , Acids, esters and other low-boiling organic compounds [0003] Most of the volatile organic compounds are toxic, some are carcinogenic, some are prone to photochemical reactions and produce photochemical smog, and some destroy the ozone layer. It is precisely because of the above-mentioned hazards of VOCs that all countries have passed legislation to continuously limit VOCs emissions. For example, the "Ai...

Claims

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Application Information

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IPC IPC(8): B01D53/00B01D53/04
Inventor 李喜青隋红李鑫钢崔吉星刘波张涛
Owner TIANJIN UNIV
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