CN109331643A - The device and method of plasma-catalytic oxidation benzene homologues pollutant - Google Patents

The device and method of plasma-catalytic oxidation benzene homologues pollutant Download PDF

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Publication number
CN109331643A
CN109331643A CN201811189303.7A CN201811189303A CN109331643A CN 109331643 A CN109331643 A CN 109331643A CN 201811189303 A CN201811189303 A CN 201811189303A CN 109331643 A CN109331643 A CN 109331643A
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China
Prior art keywords
plasma
pollutant
benzene homologues
catalytic
built
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CN201811189303.7A
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Chinese (zh)
Inventor
杜长明
陆胜勇
丁锦建
丁佳敏
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Research Institute of Zhejiang University Taizhou
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Research Institute of Zhejiang University Taizhou
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Priority to CN201811189303.7A priority Critical patent/CN109331643A/en
Publication of CN109331643A publication Critical patent/CN109331643A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8668Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/10Noble metals or compounds thereof
    • B01D2255/104Silver
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/207Transition metals
    • B01D2255/2073Manganese
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/207Transition metals
    • B01D2255/20738Iron
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/207Transition metals
    • B01D2255/20746Cobalt
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/207Transition metals
    • B01D2255/20761Copper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/80Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/818Employing electrical discharges or the generation of a plasma

Abstract

The invention discloses a kind of device of plasma-catalytic oxidation benzene homologues pollutant, including plasma micro discharge reactor, plasma micro discharge reactor both ends are sealedly connected with insulation sleeve respectively, form airtight cavity between two insulation sleeves;It is equipped with two netted interior electrodes spaced apart in airtight cavity, the inner wall of netted interior electrode edge and airtight cavity is in close contact, and forms region of discharge between two netted interior electrodes;Two netted interior electrodes are connected to high voltage power supply;Built-in catalytic module, the inner wall close contact at built-in catalytic module edge and airtight cavity are equipped in region of discharge, two netted inward-facing one sides for setting catalytic module of interior electrode are in close contact with built-in catalytic module respectively;Postposition catalyst is coated on the airtight cavity inner wall of neighbouring gas outlet.The present invention is learnt from other's strong points to offset one's weaknesses by both plasma and catalyst, is had complementary advantages, and high treating effect can carry out commercial introduction application.

Description

The device and method of plasma-catalytic oxidation benzene homologues pollutant
Technical field
The present invention relates to technical field of atmospheric pollution control more particularly to a kind of plasma-catalytic oxidation benzene homologues to pollute The device and method of object.
Background technique
At normal temperature, benzene homologues are volatile air pollutants, can be entered by approach such as skin, mucous membrane respiratory tracts Human body, to cause hidden danger that is carcinogenic, leading to deformity and induced mutation to human body.Benzene homologues can lead to respiratory disease, The defense mechanism of lung deteriorates and aggravates cardiovascular disease, and the people being in medium/low concentration benzene series substance environment for a long time can possibly even generate The problems such as nerve, cytogenetics damage, such as oligoleukocythemia, hemopoietic function of bone marrow exception etc..Benzene homologues are as volatilization Property organic matter, brings serious harm to human health.
Currently, the method for processing benzene homologues mainly has absorption method, combustion method and condensation method etc., absorption method mainly uses activity The adsorbents such as charcoal are adsorbed, and in industrial application, active carbon is the most common adsorbent for absorbing benzene homologues.But adsorption process In can still generate some unwanted by-products, and adsorbent needs to regularly replace, costly and discarded adsorbent meeting Cause secondary pollution;Combustion method is current a kind of widely used method, but rule of burning is deposited because of high treating effect At high cost, energy consumption is high, generates the shortcomings that secondary pollutions such as NOx;And condensation method also has that energy consumption is larger, is not suitable for processing temperature The disadvantages of spending lower exhaust gas.Therefore, the new Treatment process for developing a kind of benzene homologues pollutant is to solve having for problem above Effect approach.
And the features such as the multicomponent of the organic exhaust gas such as benzene homologues, low concentration, low temperature plasma show its uniqueness Superiority, such as low energy consumption, purification efficiency is high, system compact, by global extensive concern.But single low-temperature plasma There are still intermediate organic by-products O for body technique3, the problems such as secondary pollutions and the energy consumption such as NOx are higher.
Summary of the invention
The technical issues of the purpose of the present invention is to be referred in solution background technique:
In order to solve the above-mentioned technical problem, on the one hand, the present invention provides a kind of plasma-catalytic oxidation benzene homologues pollutant Device, including plasma micro discharge reactor, the plasma micro discharge reactor both ends are sealedly connected with insulation respectively It covers, forms airtight cavity between two insulation sleeves, one of them described insulation sleeve is equipped with the air inlet for being connected with air inlet pipe Mouthful, other end insulation sleeve, which is equipped with, is connected with the gas outlet of escape pipe, the air inlet and air outlet with the airtight cavity Perforation;
Two netted interior electrodes spaced apart, the netted interior electrode edge and closed chamber are equipped in the airtight cavity The inner wall of body is in close contact, and forms region of discharge between two netted interior electrodes;Two netted interior electrodes are connected to High voltage power supply;Built-in catalytic module, the inner wall at built-in the catalytic module edge and airtight cavity are equipped in the region of discharge It is in close contact, two one sides of the netted interior electrode towards the built-in catalytic module closely connect with built-in catalytic module respectively Touching;Postposition catalyst is coated on the airtight cavity inner wall of the neighbouring gas outlet;
The waste gas stream of the pollutant containing benzene homologues enters from the air inlet pipe, and treated, and gas is discharged from the escape pipe.
Further, the high voltage power supply is the high-voltage ac power or high voltage pulse with boost function and current-limiting function DC power supply, output voltage range 5-30kV.
Further, the material of the netted interior electrode is copper or stainless steel.
Further, the carrier of the built-in catalytic module is porous ceramics block or cellular catalyst carrier, the load Body thickness is 3-10mm.
Further, catalyst used in the built-in catalytic module is that one of Co, Cu, Mn and Fe and Ag are common Impregnate bimetallic catalyst obtained.
Further, the postposition catalyst is nano-TiO2Colloidal sol or silver paste.
Further, the insulation sleeve, air inlet pipe and an air outlet pipe are polytetrafluoroethylene (PTFE) material.
On the other hand, the present invention provides a kind of method of plasma-catalytic oxidation benzene homologues pollutant, makes built-in catalysis Micro channel in module forms micro discharge under high voltages, and benzene homologues pollutant air-flow is after air inlet is by netted interior electrode Into the micro discharge region of built-in catalytic module;Pass through the synergistic effect of micro discharge, built-in catalytic module and postposition catalyst Benzene homologues pollutant is decomposed, carbon dioxide and water vapour is generated, is directly discharged in atmosphere by escape pipe.
Further, the oxidation product of benzene homologues, intermediate product and O3, NOx by-product be largely built catalysis mould Block decomposes, and remainder is decomposed after the second level catalytic treatment by the postposition catalyst.
Further, the micro discharge process generates O, O2 ?、O3, H, OH and HO2Active particle and high energy electron, pass through height Energy particle bombardment and active particle oxidation, so that phenyl ring open loop and c h bond fracture, then in built-in catalytic module and postposition catalyst Further oxidation and synergistic effect is lower eliminates benzene homologues.
The present invention passes through plasma micro discharge, built-in catalytic module, the synergistic effect of postposition catalyst, by benzene homologues dirt Dye object complete oxidation is decomposed into carbon dioxide and water vapour, can reduce energy consumption by the way that catalyst is added in the plasma, reduces Secondary pollution can also improve selectivity of product, and both plasma and catalyst are learnt from other's strong points to offset one's weaknesses, and have complementary advantages, treatment effect It is good, commercial introduction application can be carried out.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of apparatus of the present invention one embodiment.
In figure, 1 plasma micro discharge reactor, 2 netted interior electrodes, 3 region of discharges, catalytic module built in 4,5 postpositions Catalyst, 6 high voltage power supplies, 7 insulation sleeves, 8 escape pipes, 9 air inlet pipe.
Specific embodiment
Presently in connection with drawings and examples, the present invention is described in further detail.
As shown in Figure 1, the device of plasma-catalytic oxidation benzene homologues pollutant of the invention, including plasma is micro- puts Electric reactor 1,1 both ends of plasma micro discharge reactor are sealedly connected with insulation sleeve 7 respectively, are formed between two insulation sleeves 7 Airtight cavity, one of insulation sleeve 7 are equipped with the air inlet for being connected with air inlet pipe 9, and other end insulation sleeve 7 is equipped with and is connected with The gas outlet of escape pipe 8, air inlet and air outlet are penetrated through with airtight cavity;
Be equipped with two netted interior electrodes 2 spaced apart in airtight cavity, netted interior 2 edge of electrode and airtight cavity it is interior Wall is in close contact, and forms region of discharge between two netted interior electrodes 2;Two netted interior electrodes 2 are connected to high voltage power supply 6;It puts Built-in catalytic module 4 is equipped in electric region, the inner wall close contact at built-in 4 edge of catalytic module and airtight cavity, two netted One side of the interior electrode 2 towards built-in catalytic module 4 is in close contact with built-in catalytic module 4 respectively;The closed chamber of neighbouring gas outlet Postposition catalyst 5 is coated on internal wall;
The waste gas stream of the pollutant containing benzene homologues enters from air inlet pipe 9, and treated, and gas is discharged from escape pipe 8.
Preferably, high voltage power supply 6 is the high-voltage ac power or pulse high-voltage direct current with boost function and current-limiting function Power supply, output voltage range 5-30kV.
Preferably, the material of netted interior electrode 2 is copper or stainless steel.
Preferably, the carrier of built-in catalytic module 4 is porous ceramics block or cellular catalyst carrier, carrier thickness 3- 10mm。
Preferably, catalyst used in built-in catalytic module 4 is that one of Co, Cu, Mn and Fe impregnate jointly with Ag Bimetallic catalyst obtained.
Preferably, postposition catalyst 5 is nano-TiO2Colloidal sol or silver paste.
Preferably, insulation sleeve 7, air inlet pipe 9 and escape pipe 8 are polytetrafluoroethylene (PTFE) material.
On the other hand, the present invention provides a kind of method of plasma-catalytic oxidation benzene homologues pollutant, makes built-in catalysis Micro channel in module 4 forms micro discharge under high voltages, and benzene homologues pollutant air-flow passes through netted interior electrode 2 through air inlet Enter the micro discharge region of built-in catalytic module 4 afterwards;Pass through the collaboration of micro discharge, built-in catalytic module 4 and postposition catalyst 5 Benzene homologues pollutant is decomposed in effect, generates carbon dioxide and water vapour, is directly discharged in atmosphere by escape pipe 8.
Preferably, the oxidation product of benzene homologues, intermediate product and O3, NOx by-product be largely built catalytic module 4 It decomposes, is decomposed after the second level catalytic treatment that remainder passes through postposition catalyst 5.
Preferably, micro discharge process generates O, O2 ?、O3, H, OH and HO2Active particle and high energy electron, pass through high energy particle Bombardment and active particle oxidation so that phenyl ring open loop and c h bond fracture, then built-in catalytic module 4 and postposition catalyst 5 into The oxidation of one step and the lower elimination benzene homologues of synergistic effect.
Specifically,
(1) tubular housing of plasma micro discharge reactor 1 uses quartz glass tube, internal diameter 31mm, outer diameter 40mm;
(2) netted interior electrode 2 uses fine etching brass screen, diameter 31mm, aperture 1mm, pitch of holes 1mm;
(3) carrier of catalytic module 3 built in, using porous ceramics block and ceramic honey comb block, diameter 31mm, thickness 5mm;
(4) catalyst of catalytic module 3 built in, using Mn/Ag dual catalyst and Co/Ag dual catalyst, preparation method is dipping Method;
(5) postposition catalyst 5 uses nano-TiO2Colloidal sol;
(6) high voltage power supply 6 uses ac high voltage source, and voltage is adjustable, and range is 5 to 30kV;
(7) insulation sleeve 7 uses polytetrafluoroethylene (PTFE), and the diameter of air inlet and air outlet thereon is 8mm;
(8) escape pipe 8 and air inlet pipe 9 use polyfluortetraethylene pipe, diameter 8mm.
It uses toluene standard gas to be tested for the representative of benzene homologues, toluene standard gas is passed through from air inlet to plasma is micro- to be put Electric reactor 1, by plasma micro discharge, built-in catalytic module 4, the synergistic effect of postposition catalyst 5, finally by toluene mark Gas complete oxidation is decomposed into carbon dioxide and water vapour.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.

Claims (10)

1. the device of plasma-catalytic oxidation benzene homologues pollutant, which is characterized in that including plasma micro discharge reactor, The plasma micro discharge reactor both ends are sealedly connected with insulation sleeve respectively, form closed chamber between two insulation sleeves Body, one of them described insulation sleeve are equipped with the air inlet for being connected with air inlet pipe, and other end insulation sleeve is equipped with and is connected with outlet The gas outlet of pipe, the air inlet and air outlet are penetrated through with the airtight cavity;
Two netted interior electrodes spaced apart, the netted interior electrode edge and closed chamber are equipped in the airtight cavity The inner wall of body is in close contact, and forms region of discharge between two netted interior electrodes;Two netted interior electrodes are connected to High voltage power supply;Built-in catalytic module, the inner wall at built-in the catalytic module edge and airtight cavity are equipped in the region of discharge It is in close contact, two one sides of the netted interior electrode towards the built-in catalytic module closely connect with built-in catalytic module respectively Touching;Postposition catalyst is coated on the airtight cavity inner wall of the neighbouring gas outlet;
The waste gas stream of the pollutant containing benzene homologues enters from the air inlet pipe, and treated, and gas is discharged from the escape pipe.
2. the device of plasma-catalytic oxidation benzene homologues pollutant according to claim 1, which is characterized in that the height Voltage source is the high-voltage ac power or pulse high-voltage direct current power supply with boost function and current-limiting function, output voltage range 5- 30kV。
3. the device of plasma-catalytic oxidation benzene homologues pollutant according to claim 1, which is characterized in that the net The material of electrode is copper or stainless steel in shape.
4. the device of plasma-catalytic oxidation benzene homologues pollutant according to claim 1, which is characterized in that in described The carrier for setting catalytic module is porous ceramics block or cellular catalyst carrier, and the carrier thickness is 3-10mm.
5. the device of plasma-catalytic oxidation benzene homologues pollutant according to claim 1, which is characterized in that in described Setting catalyst used in catalytic module is that one of Co, Cu, Mn and Fe impregnate bimetallic catalytic obtained with Ag jointly Agent.
6. the device of plasma-catalytic oxidation benzene homologues pollutant according to claim 1, which is characterized in that after described Setting catalyst is nano-TiO2Colloidal sol or silver paste.
7. the device of plasma-catalytic oxidation benzene homologues pollutant according to claim 1, which is characterized in that described exhausted Edge set, air inlet pipe and an air outlet pipe are polytetrafluoroethylene (PTFE) material.
8. the method for plasma-catalytic oxidation benzene homologues pollutant, which is characterized in that keep the micropore in built-in catalytic module logical Road forms micro discharge under high voltages, and benzene homologues pollutant air-flow enters built-in catalysis mould after air inlet is by netted interior electrode The micro discharge region of block;By the synergistic effect of micro discharge, built-in catalytic module and postposition catalyst by benzene homologues pollutant It decomposes, generates carbon dioxide and water vapour, be directly discharged in atmosphere by escape pipe.
9. the method for plasma-catalytic oxidation benzene homologues pollutant according to claim 8, which is characterized in that benzene homologues Oxidation product, intermediate product and O3, NOx by-product be largely built catalytic module decomposition, remainder passes through described It is decomposed after the second level catalytic treatment of postposition catalyst.
10. the method for plasma-catalytic oxidation benzene homologues pollutant according to claim 8 or claim 9, which is characterized in that institute It states micro discharge process and generates O, O2 ?、O3, H, OH and HO2Active particle and high energy electron pass through high-energy particle bombardment and active grain Son oxidation, so that phenyl ring open loop and c h bond fracture, then further oxidation and collaboration in built-in catalytic module and postposition catalyst Effect is lower to eliminate benzene homologues.
CN201811189303.7A 2018-10-12 2018-10-12 The device and method of plasma-catalytic oxidation benzene homologues pollutant Pending CN109331643A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110327772A (en) * 2019-07-10 2019-10-15 中山大学 Organic pollutant system in a kind of wet type low temperature plasma removing flue gas

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000075396A (en) * 1999-05-20 2000-12-15 김덕중 Exhaust gas purifier of internal combustion engine
CN2778371Y (en) * 2005-03-17 2006-05-10 上海锦惠复洁环境工程有限公司 Plasma and light catalyzing combined air purifier device
CN105597529A (en) * 2015-12-24 2016-05-25 浙江大学 Technology and device for degrading industrial organic exhaust gas through collaboration of low-temperature plasma with two-stage catalysis

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000075396A (en) * 1999-05-20 2000-12-15 김덕중 Exhaust gas purifier of internal combustion engine
CN2778371Y (en) * 2005-03-17 2006-05-10 上海锦惠复洁环境工程有限公司 Plasma and light catalyzing combined air purifier device
CN105597529A (en) * 2015-12-24 2016-05-25 浙江大学 Technology and device for degrading industrial organic exhaust gas through collaboration of low-temperature plasma with two-stage catalysis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110327772A (en) * 2019-07-10 2019-10-15 中山大学 Organic pollutant system in a kind of wet type low temperature plasma removing flue gas

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