CN108543418B - Slot type waste gas purifying device capable of being combined in multiple stages - Google Patents

Slot type waste gas purifying device capable of being combined in multiple stages Download PDF

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CN108543418B
CN108543418B CN201810380265.7A CN201810380265A CN108543418B CN 108543418 B CN108543418 B CN 108543418B CN 201810380265 A CN201810380265 A CN 201810380265A CN 108543418 B CN108543418 B CN 108543418B
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catalyst
unit
slot
cover plate
plasma
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CN108543418A (en
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叶丽萍
夏克
张磊
杨维成
黄金花
杨丙星
罗勇
郭潞阳
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Shanghai Research Institute of Chemical Industry SRICI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8678—Removing components of undefined structure
    • B01D53/8687—Organic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/32—Separation 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
    • B01D53/8675—Ozone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/502—Carbon monoxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/818—Employing electrical discharges or the generation of a plasma

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to a slot type waste gas purifying device capable of being combined in multiple stages, which comprises a box body, and a filtering unit, a plasma catalytic reaction unit and a multifunctional catalyst unit which are sequentially inserted in the box body, wherein the two ends of the box body are respectively provided with an air inlet and an air outlet, and the top of the box body is provided with a filtering unit slot, a plasma catalytic reaction unit slot and a multifunctional catalyst unit slot which are matched with the filtering unit, the plasma catalytic reaction unit and the multifunctional catalyst unit. Compared with the prior art, the invention adopts a slot type, is convenient to assemble, disassemble, replace and overhaul, has high flexibility of device engineering operation, adjustable number of catalyst filling modules, can freely carry out multi-stage combination of series and parallel connection, and has strong adaptability. The device can realize the high-efficiency degradation of waste gas containing VOCs, stink and the like, and can treat residual CO and O3 to reach the emission standard.

Description

Slot type waste gas purifying device capable of being combined in multiple stages
Technical Field
The invention relates to the technical field of waste gas purification, in particular to a multi-stage combined slot type waste gas purification device.
Background
At present, the emission of various toxic and harmful gases causes serious environmental pollution, the total emission amount is huge, and the increase is rapid. Low concentration of harmful gaseous pollutants (e.g. VOCs, H)2S、NOx、NH3Etc.) are widely generated in the processes of transportation, industrial production, energy conversion, daily life and the like, and various malodors associated with the malodors can cause human bodies to generateCausing chronic damage and even poisoning and life threatening. In recent years, various national large environmental protection policies are successively released, and the pollution control of waste gases such as VOCs and malodorous gas is stepped into the main battlefield of environmental protection work.
Currently, the technologies for treating waste gases such as VOCs and malodorous gases are mainly divided into two types, one is a recovery technology, mainly adopts various physical methods, and absorbs, filters and separates the discharged waste gases, and recycles the waste gases, including adsorption, condensation, membrane separation, absorption and other technologies. The other is decomposition technology, mainly chemical treatment and biological treatment, which converts the discharged VOCs or malodorous decomposition compounds into other nontoxic, harmless and tasteless substances, including thermal combustion, catalytic combustion, plasma, chemical absorption, ultraviolet (catalytic) oxidation, biological treatment and other technologies. Based on a strict emission policy, the adoption of an exhaust gas cleaning treatment technology is encouraged, secondary pollution is avoided, and the method is the trend of industry control. However, the concentration of waste gas treatment industries such as VOCs and malodorous gas is low, the contradiction between the continuous improvement of environmental protection requirements and the relative insufficiency of treatment capability is increasingly highlighted, and some treatment enterprises with weak technology and insufficient experience are in the first place to open the market, so that low-efficiency technology is provided, low-price competition is carried out, and the healthy and continuous development of the whole waste gas treatment industries such as VOCs and malodorous gas is not facilitated.
The technology and the complete set of combined process and device for treating waste gas such as VOCs (volatile organic compounds), stink and the like with low cost, high efficiency and energy conservation are developed for small and medium-sized enterprises, are challenges and opportunities in the waste gas treatment industry, and are effective ways for solving the industrial waste gas problem and relieving pollution control pressure of the enterprises. The waste gas treatment technologies such as destructive VOCs, malodour and the like are relatively cleaner, more thorough and more environment-friendly, wherein the catalytic combustion technology has high treatment efficiency, but the precious metal catalyst is adopted, so the price is high, and the treatment cost is obviously increased; meanwhile, the treatment temperature is required to be over 300-400 ℃, the energy consumption is high, and the method is not suitable for treating waste gas under intermittent working conditions; the emerging plasma method has the advantages of rapid reaction, wide application range, mild reaction conditions and the like, and thus becomes a hotspot of research. However, plasma treatment of VOCs and malodorous exhaust gases also presents some problems: 1. short retention time results in the reduction of VOCs such as benzene seriesThe solution rate is not high; 2. the tail gas can generate O with a certain concentration3(ii) a 3. The selectivity is not high, and harmful byproducts are easy to generate. The above problems can be solved to some extent by effectively combining the plasma with the catalyst.
Delagrel et al (S. Delagrel, et al. applied Catalysis B.2006:68:92-98) subject dielectric barrier discharge to MnO2/γ-Al2O3The catalyst is combined to treat the toluene, the conversion rate of the toluene is improved by 52 percent compared with that of the toluene when the catalyst is singly discharged after the catalyst and the toluene are combined, and the catalyst also effectively inhibits O3But product COxThe proportion of medium CO still exceeds 43%. Chinese patent CN 105797579A discloses a process for treating VOCs by plasma-mesoporous catalysis, which integrates adsorption, catalytic oxidation and plasma-enhanced action of mesoporous catalyst to treat volatile organic waste gas, and has the advantages of low energy consumption, simple equipment and low cost, but the treatment space velocity (5000 h)-1) Is smaller. Chinese patent CN 105749744a discloses a filled type purification device for absorbing and catalyzing VOCs with low-temperature plasma, which integrates low-temperature plasma technology, adsorption technology and catalysis technology, has the capability of decomposing pollutant molecules with high efficiency, and has low treatment energy consumption, but the fixed one-stage structure is inflexible, and cannot adapt to various working conditions, and the filled active carbon adsorbent needs to be replaced regularly.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and to provide a slot-in type exhaust gas purification device with flexible structure and capable of being assembled in multiple stages.
The purpose of the invention can be realized by the following technical scheme: the utility model provides a slot-in type of can multistage combination purifies device of waste gas, the device include the box and insert filter unit, plasma catalytic reaction unit and the multi-functional catalyst unit of establishing in the box in proper order, air inlet and gas outlet are seted up respectively to the both ends of box to set up at the box top with filter unit, plasma catalytic reaction unit and the filter unit slot that multi-functional catalyst unit matches, plasma catalytic reaction unit slot and multi-functional catalyst unit slot. The clothesWhen the device is in operation, waste gases such as VOCs and stink enter the device through the rear connecting fan, are filtered by the filtering unit and then enter the plasma catalytic reaction unit for high-pressure ionization, oxidative degradation and catalyst synergistic treatment. The treated gas is further catalyzed and oxidized by a multifunctional catalyst unit, and finally the waste gases such as VOCs, stink and the like are thoroughly converted into CO2And H2And leading out the odorless gases such as O and the like from the device through a fan. Because this device installs filter unit, plasma catalytic reaction unit and multi-functional catalyst unit in the box through the form of picture peg, slot, the dismouting of being convenient for is changed, and the flexibility is higher.
The filtering unit comprises a filtering cover plate and a reticular inserting plate, wherein the top of the filtering cover plate is horizontally arranged, and the reticular inserting plate is perpendicular to the filtering cover plate.
The aperture of the reticular inserting plate is 0.5-5 mm.
The plasma catalytic reaction unit comprises a reaction cover plate and a reaction plugboard, wherein the top of the reaction cover plate is horizontally arranged, the reaction plugboard is perpendicular to the reaction cover plate, a plurality of plasma reactors are fixedly arranged in the reaction plugboard along the airflow direction and are arranged in parallel, and a first catalyst is filled in each plasma reactor. The plasma treatment mode and the catalyst treatment mode are effectively combined, so that most harmful substances in the waste gas can be quickly removed.
The plasma reactor is a double-dielectric barrier discharge reactor, the first catalyst is filled in an afterglow area next to the rear end of the discharge area, and the problem that safety accidents are easy to occur due to the fact that the catalyst is arranged in the discharge area of the reactor in the synergistic process of the plasma catalyst because the concentration of VOCs is too high is solved.
The first catalyst is a spherical supported first catalyst, and the carrier of the first catalyst is selected from Al2O3、SiO2、TiO2SBA-15, ZSM-5, 13X, 10X, 4A, 5A or activated carbon, wherein the active component of the first catalyst is selected from CrOx、MnOx、FeOx、CoOx、NiO、CuO、ZnO、CeO2、La2O3、MoOx、SnO2Or ZrO2Wherein, the weight percentage of the active component is 1 to 10 percent.
The number of the plasma reactors is 3-10.
The multifunctional catalyst unit comprises a plurality of subunits which are arranged in parallel along the airflow direction, each subunit comprises a catalyst cover plate and a catalyst inserting plate, the top of each catalyst cover plate is horizontally arranged, the catalyst inserting plate is perpendicular to the catalyst cover plate, and a second catalyst is filled in each catalyst inserting plate. The quantity of the catalyst flashboards is flexibly selected to be inserted according to the severe degree of the actual working condition, and the slots at the sections which are not started are used for sealing the cover plate, so that the problem that the catalyst filling amount is fixed and can not adapt to various working conditions is solved.
The second catalyst is a honeycomb type monolithic catalyst, the substrate of the second catalyst is a honeycomb ceramic carrier, and the coating of the second catalyst is calcined hydrotalcite-like Mg (M) (Al) O, wherein M is one or more of Cr, Mn, Fe, Co, Cu, Zn, Ce, Mo, Sn or Zr; the active component of the second catalyst is CrOx、MnOx、FeOx、CoOxNiO, CuO, ZnO or CeO2One or more of (a). The roasted hydrotalcite-like compound has a higher specific surface area, is beneficial to high dispersion of active components and inhibition of agglomeration of the active components, and the introduction of elements such as Cr, Ce, Mo, Zr and the like can improve the oxygen storage capacity of the catalyst and is beneficial to further oxidative decomposition of pollutant molecules.
And sealing flanges are arranged at the air inlet and the air outlet and are connected with a waste gas pipeline. The box body can be used as each independent small unit to be freely combined in series or in parallel in multiple stages to form a larger waste gas treatment device unit to adapt to different working conditions.
Compared with the prior art, the beneficial effects of the invention are embodied in the following aspects:
(1) in a plasma catalytic reaction unit of the device, a catalyst is arranged in a plasma discharge afterglow area, so that the problem that safety accidents are easily caused due to the fact that the catalyst is arranged in a reactor discharge area in the cooperative process of the plasma catalyst because the concentration of VOCs is too high is solved.
(2) In the multifunctional catalyst unit of the device, the catalyst is filled in a honeycomb ceramic monolithic catalyst module, so that the problem of large wind resistance of filling of the particle catalyst is solved, and the catalyst can simultaneously treat VOCs, CO and O3 to realize multifunctional purification. The coating (second carrier) of the monolithic catalyst adopts a calcined hydrotalcite-like material, so that the dispersity of the active components is improved, agglomeration is inhibited, the service life of the catalyst is prolonged, the oxygen storage capacity is increased, and the emission of byproducts is reduced.
(3) In the device, the filtering unit, the plasma catalytic reaction unit and the multifunctional catalyst unit are all arranged in a slot type, so that the device is convenient to assemble, disassemble, replace and overhaul. The multifunctional catalyst unit is divided into three sections, the number of modules inserted with the catalyst can be flexibly selected according to the severity of actual working conditions, and the slots of the sections are not started to seal the cover plate, so that the problem that the catalyst loading is fixed and cannot adapt to various working conditions is solved.
(4) The device has high engineering operation flexibility, the air inlet end and the air outlet end of the box body can be hermetically connected through flanges, and the box body can be used as each independent small unit and can be freely combined in series or in parallel in multiple stages to form a larger waste gas treatment device unit to adapt to different working conditions.
Drawings
Fig. 1 is a schematic perspective view of the device of the present invention.
FIG. 2 is a schematic cross-sectional profile of the device of the present invention.
The plasma catalytic reactor comprises a box body 1, a filter unit slot 2, a plasma catalytic reaction unit slot 3, a multifunctional catalyst unit slot 4, sealing flanges 5 and 6, an air inlet 7, an air outlet 8, a filter unit 9, a filter cover plate 91, a filter insert plate 92, a plasma catalytic reaction unit 10, a reaction cover plate 101, a reaction insert plate 102, a double-medium barrier discharge reactor 103, a discharge area 104, a first catalyst 105, a multifunctional catalyst unit 11, a catalyst cover plate 111, a catalyst insert plate 112 and a second catalyst 113.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The utility model provides a slot type that can multistage combination purifies device of waste gas, its structure is shown in figure 1, figure 2, including box 1 and filter unit 9, plasma catalytic reaction unit 10 and multi-functional catalyst unit 11, wherein be equipped with filter unit slot 2 on the box 1, plasma catalytic reaction unit slot 3, multi-functional catalyst unit slot 4 is used for inserting respectively and establishes filter unit 9, plasma catalytic reaction unit 10 and multi-functional catalyst unit 11, the box both ends are equipped with air inlet 7, gas outlet 8, and be equipped with sealing flange 5 in air inlet 7 department, be equipped with sealing flange 6 in gas outlet 8 department.
The filter unit 9 includes a filter cover plate 91 horizontally disposed at the top and a mesh insert plate 92 disposed perpendicular to the filter cover plate 91.
The plasma catalytic reaction unit 10 comprises a reaction cover plate 101 horizontally arranged at the top and a reaction plug plate 102 arranged perpendicular to the reaction cover plate 101, wherein a plurality of double-medium barrier discharge reactors 103 arranged in parallel along the airflow direction are fixedly arranged in the reaction plug plate 102, a first catalyst 105 is filled in the double-medium barrier discharge reactor 103, and the first catalyst 105 is filled in an afterglow area next to the rear end of a discharge area 104.
The multifunctional catalyst unit 11 comprises three sub-units arranged in parallel along the gas flow direction, each sub-unit comprises a catalyst cover plate 111 arranged horizontally at the top and a catalyst insert plate 112 arranged perpendicular to the catalyst cover plate 111, and each catalyst insert plate is filled with a second catalyst 113.
VOCs waste gas to be treated enters the device from the gas inlet 7, is firstly filtered and pretreated by the filtering unit 9, the treated waste gas enters the plasma catalytic reaction unit 10, the VOCs are subjected to oxidative degradation by plasma in the discharging area 103, and the undegraded VOCs, bonds broken but undegraded small molecules and the small molecules trapped by the first catalyst 105 are subjected to complete degradationThe oxygen-containing active free radicals generated by the plasma discharge further undergo oxidation reaction, then the gas enters the multifunctional catalyst module 11, and the residual CO is converted into CO through the catalytic action2，O3Is thoroughly decomposed, the generated oxygen free radicals and the VOCs which are not degraded yet generate catalytic oxidation reaction again, and the product CO2And H2And the O is led out of the device by a fan.
The device is used for treating toluene-containing waste gas, and the flow rate of the waste gas is 0.27m3At an initial toluene concentration of 500mg/m3. Using MnOx-CeO2/Al2O3-ZSM-5 as catalyst filled in afterglow area, multifunctional catalyst unit inserted into a piece of CuO-MnOx(Al)/Mg (Ce) O/CC monolithic catalyst module. The device can continuously treat the toluene waste gas for 48 hours, the effect is stable, the toluene degradation rate reaches 95 percent, and CO is generated2Has a selectivity of over 90% and an outlet CO concentration of less than 350mg/m3，O3Not detected.
Example 2
The same apparatus as in example was used to treat the n-heptane-containing waste gas at a flow rate of 0.27m3H, the initial concentration of the n-heptane is 500-1000 mg/m3. Using MnOx-FeOx/Al2O3As catalyst filled in afterglow area, multifunctional catalyst unit is inserted into MnOx-CeO2(Al)/Mg (Zr) O/CC monolithic catalyst module. The device can treat the n-heptane waste gas for 48 hours, the effect is stable, the n-heptane degradation rate reaches 98 percent, and CO is stable2Has a selectivity of over 95% and an outlet CO concentration of less than 175mg/m3，O3Not detected.
Example 3
The treatment of the ethyl acetate-containing waste gas was carried out by the same apparatus as in example, and the flow rate of the waste gas was 0.27m3H, the initial concentration of the ethyl acetate is 500-1000 mg/m3. Using MnOx-CeO2The catalyst/AC is filled in an afterglow area, and the multifunctional catalyst unit is inserted into a MnOx-CoOxA/Mg (Cr) (Al) O/CC monolithic catalyst module. The device can treat the ethyl acetate waste gas for 48 hours, the effect is stable, and the ethyl acetate degradation rate reaches96％，CO2The selectivity of (2) is over 95 percent, and the outlet CO concentration is lower than 20mg/m3，O3Not detected.
Example 4
The treatment of the acetic acid-containing off-gas was carried out by the same apparatus as in example, with an off-gas flow rate of 0.27m3The initial concentration of acetic acid is 300-600 mg/m3. Using MnOx-FeOxZSM-5 as catalyst filled in afterglow area, multifunctional catalyst unit inserted with CuO-FeOx(Al) O/CC monolithic catalyst module. The device can continuously treat acetic acid waste gas for 48 hours, the effect is stable, the acetic acid degradation rate reaches 97 percent, and CO is generated2The selectivity of (2) is over 96 percent, and the outlet CO concentration is lower than 12mg/m3，O3Not detected.
Example 5
The treatment of the mixed waste gas containing n-heptane and ethyl acetate was carried out by the same apparatus as in example, and the waste gas flow rate was 0.25m3H, total concentration of VOCs 300mg/m3. Using CuO-MnOx-FeOx/Al2O3ZSM-5 as catalyst filled in afterglow area, and the space velocity of plasma catalytic reaction is 15000h-1Left and right, the multifunctional catalyst unit is not inserted into the monolithic catalyst module, the outlet tail gas is detected, and the total concentration of VOCs is lower than 15mg/m3CO concentration lower than 15mg/m3，O3Not detected.
Example 6
The same device as the embodiment is adopted to carry out the H content of a certain household garbage factory2S、NH3And the waste gas with foul odor and peculiar smell such as organic acid and the like is treated, and the air volume of the waste gas is 100m3H, exhaust gas concentration 50mg/m3. The device configuration: the catalyst filled in the afterglow area is CuO-MnOx-FeOxThe plasma catalytic reaction unit is inserted into a piece of CuO-MnOx-CoOx(Ce) O/CC monolithic catalyst module. The detection concentration of the odor and peculiar smell outlet is lower than 5mg/m3。
Example 7
The same device as the embodiment is adopted to carry out the anticorrosion paint spraying waste gas on the inner surface of a certain oil pipeline, and the waste gas contains benzene, toluene and dimethylbenzeneEqual VOCs and waste gas air volume of 800m3H is used as the reference value. The device configuration: the catalyst filled in the afterglow area is CuO-MnOx-FeOxZSM-5, two CuO-MnO blocks are inserted into the plasma catalytic reaction unitx(Al)/Mg (Ce) O/CC monolithic catalyst module. Detecting that the outlet concentration of VOCs is lower than 6mg/m3。
Example 8
The same device as the embodiment is adopted to collect and treat the peculiar smell of the waste gas containing methanol, dimethylbenzene, acetic acid and the like at the product outlet of a certain glove production workshop, and the air volume of the waste gas is 500m3H, the concentration of waste gas is 10-80 mg/m3. The device configuration: the catalyst filled in the afterglow area is CuO-MnOx-FeOxThe plasma catalytic reaction unit is inserted into three CuO-MnO blocksx-CoOx(Al) O/CC monolithic catalyst modules. The removal rate of the peculiar smell of the waste gas reaches more than 95 percent, the sense smell of the staff is free from peculiar smell, and the concentration of the outlet ozone reaches the standard.
Example 9
The same device as the embodiment is adopted to purify waste gas containing acetic acid, alcohols and the like in a certain sewage tank, and the waste gas air volume is 1000m3H is used as the reference value. The device configuration: the catalyst filled in the afterglow area is CuO-MnOx-FeOx/AC-Al2O3-ZSM-5, three CuO-MnO inserted in the plasma catalytic reaction unitx-CoOx(Al) O/CC monolithic catalyst modules. The removal rate of the peculiar smell of the waste gas reaches more than 95 percent, and the sense smell of customers has no peculiar smell of the waste gas.

Claims (6)

1. A slot type waste gas purifying device capable of being combined in multiple stages is characterized by comprising a box body, a filtering unit, a plasma catalytic reaction unit and a multifunctional catalyst unit, wherein the filtering unit, the plasma catalytic reaction unit and the multifunctional catalyst unit are sequentially inserted into the box body;
the plasma catalytic reaction unit comprises a reaction cover plate and a reaction plug plate, wherein the top of the reaction cover plate is horizontally arranged, the reaction plug plate is vertical to the reaction cover plate, a plurality of plasma reactors which are arranged in parallel along the airflow direction are fixedly arranged in the reaction plug plate, and a first catalyst is filled in each plasma reactor;
the plasma reactor is a double-medium barrier discharge reactor, and the first catalyst is filled in an afterglow area next to the rear end of a discharge area;
the multifunctional catalyst unit comprises a plurality of subunits which are arranged in parallel along the airflow direction, each subunit comprises a catalyst cover plate and a catalyst inserting plate, the top of each catalyst cover plate is horizontally arranged, the catalyst inserting plate is perpendicular to the catalyst cover plate, and a second catalyst is filled in each catalyst inserting plate;
the second catalyst is a honeycomb type monolithic catalyst, the substrate of the second catalyst is a honeycomb ceramic carrier, and the coating of the second catalyst is calcined hydrotalcite-like Mg (M) (Al) O, wherein M is one or more of Cr, Mn, Fe, Co, Cu, Zn, Ce, Mo, Sn or Zr; the active component of the second catalyst is CrOx、MnOx、FeOx、CoOxNiO, CuO, ZnO or CeO2One or more of (a).
2. The multi-stage combinable slot-in type exhaust gas purifying device as claimed in claim 1, wherein the filtering unit comprises a filtering cover plate horizontally arranged at the top and a mesh insert plate vertically arranged with the filtering cover plate.
3. The multi-stage combined slot-in type exhaust gas purification device as claimed in claim 2, wherein the mesh-like insertion plate has a pore size of 0.5-5 mm.
4. The multi-stage combinable slot-in type exhaust gas purifying device according to claim 1, wherein the first catalyst is a ball-type supported first catalyst, and a carrier of the first catalyst is selected from Al2O3、SiO2、TiO2、SBA-15、ZSM-5、13X、10One or more of X, 4A, 5A or activated carbon, and the active component of the first catalyst is selected from CrOx、MnOx、FeOx、CoOx、NiO、CuO、ZnO、CeO2、La2O3、MoOx、SnO2Or ZrO2Wherein, the weight percentage of the active component is 1 to 10 percent.
5. The multi-stage combined slot-in type exhaust gas purifying device according to claim 1, wherein the number of the plasma reactors is 3 to 10.
6. The multi-stage combinable slot-in type apparatus for purifying exhaust gas according to claim 1, wherein the inlet and outlet are provided with sealing flanges and connected to an exhaust gas pipe.
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