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CN-122006467-A - System and method for treating chlorine-containing volatile organic compounds

CN122006467ACN 122006467 ACN122006467 ACN 122006467ACN-122006467-A

Abstract

The present invention relates to a system and method for treating chlorine-containing volatile organic compounds. The system comprises a pretreatment unit, an adsorption concentration unit, a regeneration unit and a degradation unit which are sequentially connected, wherein the pretreatment unit is used for cooling and dehumidifying high-humidity waste gas, a hydrophobic adsorption material is filled in the adsorption concentration unit for adsorption concentration, the regeneration unit is used for providing hot inert gas for desorption, and the degradation unit is a low-temperature plasma-catalytic coupling reactor filled with a specific catalyst which takes TiO 2 as a carrier, loads MnOx and CeO 2 and is doped with molybdenum or tungsten elements. The method realizes the efficient treatment of the chlorine-containing organic matters through the steps of cooling, dehumidification, adsorption concentration, hot nitrogen desorption, plasma-catalytic degradation and the like. The invention not only can effectively degrade chlorine-containing organic matters, but also can obviously inhibit the generation of dioxin and avoid secondary pollution, and simultaneously has the advantages of adaptability to high-humidity environment, low energy consumption and high safety, and can obviously promote industrial application value and environmental benefit.

Inventors

  • YANG ZAIHUA
  • CHEN HENGYUN
  • FENG PEI
  • TANG ZHENG
  • CHEN MINGYI
  • ZENG YALING
  • PENG GUOBIAO

Assignees

  • 厦门爱迪特环保科技有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (10)

  1. 1. A system for treating chlorine-containing volatile organic compounds, comprising: the pretreatment unit is used for cooling and dehumidifying the intake air; the adsorption concentration unit is connected with the pretreatment unit, and is filled with a hydrophobic adsorption material for adsorbing organic matters in the pretreated waste gas; The regeneration unit is connected with the adsorption concentration unit and is used for providing heated inert gas for the adsorption concentration unit to carry out desorption; The degradation unit is connected with the adsorption concentration unit and is used for degrading the high-concentration organic gas generated by desorption, The degradation unit is a low-temperature plasma-catalytic coupling reactor, the low-temperature plasma-catalytic coupling reactor comprises a dielectric barrier discharge plasma generator and a catalyst arranged in a discharge area of the plasma generator, the catalyst takes TiO 2 as a carrier, is loaded with MnOx and CeO 2 as active components, is doped with molybdenum or tungsten elements, and is used for degrading chlorine-containing volatile organic matters and inhibiting the generation of dioxin under the synergistic effect of plasmas.
  2. 2. The system according to claim 1, wherein the molar ratio of MnOx to CeO 2 is 1 (0.5-2), and the doping amount of the molybdenum or tungsten element is 0.5-3% of the total mass of the catalyst.
  3. 3. The system of claim 1, wherein the hydrophobic adsorbent material is at least one of a hydrophobically modified zeolite molecular sieve, a metal organic framework material, a hydrophobic activated carbon, or a high silicon molecular sieve; Wherein the zeolite molecular sieve has a silica to alumina ratio greater than 200.
  4. 4. The system of claim 1, wherein the adsorption concentration unit comprises at least two adsorption tanks arranged in parallel and a valve set connected to the adsorption tanks; the valve group is capable of switching the gas flow so that at least one canister performs a desorption or cooling operation while at least another canister performs an adsorption operation.
  5. 5. The system of claim 1, wherein the regeneration unit comprises an inert gas source, a heater, and a gas recovery line having a condenser for pre-cooling the desorbed high concentration organic gas.
  6. 6. The system of any one of claims 1-5, further comprising a purification unit disposed at an outlet end of the degradation unit for capturing trace contaminants and acid gases remaining in the reacted gas.
  7. 7. The system of any one of claims 1-5, further comprising a control unit electrically connected to the pretreatment unit, the adsorption concentration unit, and the regeneration unit, respectively, for controlling the operation parameters of the pretreatment unit, and for controlling the mode switching and the gas flow direction between the adsorption concentration unit and the regeneration unit.
  8. 8. A method of treating chlorine-containing volatile organic compounds using the system of any one of claims 1 to 7, comprising the steps of: s1, introducing the waste gas containing the volatile organic compounds into the pretreatment unit, and reducing the temperature of the waste gas to 5-15 ℃ and the relative humidity to below 30%; S2, introducing the pretreated waste gas into an adsorption tank of the adsorption concentration unit in an adsorption mode, and adsorbing organic matters in the waste gas by using the hydrophobic adsorption material; s3, switching to a desorption mode after the adsorption concentration unit is saturated in adsorption, and introducing high-temperature inert gas into the adsorption concentration unit through the regeneration unit to carry out desorption to obtain high-concentration organic gas; s4, introducing the high-concentration organic gas into the plasma-catalytic coupling reactor, and carrying out degradation reaction under the synergistic effect of plasma and a catalyst; S5, purifying tail gas generated by the degradation reaction and then discharging.
  9. 9. The method according to claim 8, wherein in step S3, the inert gas is nitrogen and the desorption temperature is 100 ℃ to 200 ℃.
  10. 10. The method of claim 8, wherein the low temperature plasma-catalytic coupled reactor has an energy density of 100J/L to 500J/L.

Description

System and method for treating chlorine-containing volatile organic compounds Technical Field The invention relates to the technical field of environmental protection and waste gas treatment, in particular to a system and a method for treating chlorine-containing volatile organic compounds. Background The chlorine-Containing Volatile Organic Compounds (CVOCs) such as methylene dichloride, chlorobenzene, trichloroethylene and the like are widely derived from industries such as chemical industry, pesticide, medicine, coating, hazardous waste disposal and the like. The material has the characteristics of high toxicity, strong environmental durability and the like. At present, a combustion method is generally adopted when the substances are treated, high temperature (> 760 ℃) is required to be maintained for thermal combustion (RTO), energy consumption is huge, generation of dioxin is easier to promote at high temperature, secondary pollution is caused, and in addition, the combustion method is difficult to cope with common industrial waste gas conditions with low concentration and high humidity and cannot meet the requirements of industrial development and environmental protection. Disclosure of Invention The invention aims to provide a system and a method for treating chlorine-containing volatile organic compounds, which are used for solving the problems of low efficiency, high energy consumption and secondary pollution caused by the combustion method in the prior art when the chlorine-containing volatile organic compounds are treated. To solve the above technical problem, in a first aspect, the present invention provides a system for treating chlorine-containing volatile organic compounds, comprising: the pretreatment unit is used for cooling and dehumidifying the intake air; the adsorption concentration unit is connected with the pretreatment unit, and is filled with a hydrophobic adsorption material for adsorbing organic matters in the pretreated waste gas; The regeneration unit is connected with the adsorption concentration unit and is used for providing heated inert gas for the adsorption concentration unit to carry out desorption; The degradation unit is connected with the adsorption concentration unit and is used for degrading the high-concentration organic gas generated by desorption, The degradation unit is a low-temperature plasma-catalytic coupling reactor, the low-temperature plasma-catalytic coupling reactor comprises a dielectric barrier discharge plasma generator and a catalyst arranged in a discharge area of the plasma generator, the catalyst takes TiO 2 as a carrier, is loaded with MnOx and CeO 2 as active components, is doped with molybdenum or tungsten elements, and is used for degrading chlorine-containing volatile organic matters and inhibiting the generation of dioxin under the synergistic effect of plasmas. In one embodiment, the molar ratio of MnOx to CeO 2 is 1 (0.5-2), and the doping amount of the molybdenum or tungsten element is 0.5-3% of the total mass of the catalyst. In one embodiment, the hydrophobic adsorption material is at least one of a zeolite molecular sieve modified by hydrophobization, a metal organic framework material, hydrophobic activated carbon or a high silicon molecular sieve; Wherein the zeolite molecular sieve has a silica to alumina ratio greater than 200. In one embodiment, the adsorption concentration unit comprises at least two adsorption tanks arranged in parallel and a valve group connected with the adsorption tanks; the valve group is capable of switching the gas flow so that at least one canister performs a desorption or cooling operation while at least another canister performs an adsorption operation. In one embodiment, the regeneration unit comprises an inert gas source, a heater and a gas recovery pipeline, wherein a condenser is arranged on the gas recovery pipeline and is used for pre-cooling the desorbed high-concentration organic gas. In one embodiment, the device further comprises a purification unit, wherein the purification unit is arranged at the outlet end of the degradation unit and is used for capturing trace pollutants and acid gases remained in the gas after the reaction. In one embodiment, the system further comprises a control unit, wherein the control unit is electrically connected with the pretreatment unit, the adsorption concentration unit and the regeneration unit respectively, and is used for controlling the operation parameters of the pretreatment unit and controlling the mode switching and the gas flow direction between the adsorption concentration unit and the regeneration unit. In a second aspect, the present invention also provides a method for treating chlorine-containing volatile organic compounds using the above system, comprising the steps of: s1, introducing the waste gas containing the volatile organic compounds into the pretreatment unit, and reducing the temperature of the waste gas to 5-15 ℃ and the relative humidi