CN114377544B - Low-temperature plasma catalytic degradation malodorous gas treatment equipment and malodorous gas treatment method - Google Patents
Low-temperature plasma catalytic degradation malodorous gas treatment equipment and malodorous gas treatment method Download PDFInfo
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- CN114377544B CN114377544B CN202210084895.6A CN202210084895A CN114377544B CN 114377544 B CN114377544 B CN 114377544B CN 202210084895 A CN202210084895 A CN 202210084895A CN 114377544 B CN114377544 B CN 114377544B
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- 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
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Abstract
The application relates to a low-temperature plasma catalytic degradation malodorous gas treatment device and a malodorous gas treatment method. The malodorous gas treatment equipment comprises a box body provided with a gas inlet and a gas outlet; the plasma catalytic degradation zone is arranged in the box body and communicated with the air inlet, a plasma generator is arranged in the plasma catalytic degradation zone, and the inner wall of the box body in the area of the plasma catalytic degradation zone is coated with a transition metal oxide coating; the activated carbon treatment assembly is arranged in the box body, separates the gas outlet from the plasma catalytic degradation zone, is filled with a carbon-based catalyst and is used for cooperatively catalyzing and degrading malodorous gas by combining ozone and plasma. The malodorous gas treatment equipment utilizes low-temperature plasma and excessive ozone generated in the ionization process of the low-temperature plasma to be combined with the transition metal oxide and the carbon-based catalyst to catalyze and degrade malodorous gas, has high treatment efficiency and good treatment effect, fully utilizes the ozone generated when the plasma generator works, and greatly reduces the secondary pollution caused by the ozone.
Description
Technical Field
The application relates to the field of malodorous gas treatment equipment, in particular to low-temperature plasma catalytic degradation malodorous gas treatment equipment and a malodorous gas treatment method.
Background
The plasma refers to an aggregate with the same positive and negative charges and the ionization degree of more than 0.1%, which is composed of a large number of particles such as ions, electrons, atoms, molecules, free radicals, and is a fourth substance form widely existing in the natural environment besides gas, liquid and solid. The plasmas can be divided into low-temperature plasmas and high-temperature plasmas, the ionization degree of the high-temperature plasmas is close to 100%, and the high-temperature plasmas are usually realized at ultrahigh temperature, so that the low-temperature plasmas are more applied.
In recent years, low-temperature plasma catalysis technology is one of effective methods for treating malodorous gases, and plasmas, high-energy electrons and excited atoms generated in discharge forms such as corona discharge and dielectric barrier discharge can react with background gases to break down or activate O 2 、H 2 The environmental gas molecules such as O and the like generate active free radical substances such as O, OH and the like with high activityThe reaction system is changed into a mixed state with coexisting particles such as free radicals, electrons, photons, positive and negative ions, molecules, excited molecules and the like, and the mixed state substance and the intermediate have extremely strong oxidability and high reaction activity and can rapidly generate oxidation-reduction reaction with malodorous pollutant molecules. Among them, active radicals, which play a major role in the degradation of pollutants, oxidize and degrade gaseous organic molecules and other reducing gas molecules to oxidize the pollutant molecules and generate CO 2 、H 2 O and the like are nontoxic and harmless micromolecules, so that the malodorous pollutants are degraded, and the method has the characteristics of low energy consumption, no radioactive substance, short treatment reaction flow, suitability for treating most of polluted gases and the like.
However, the low-temperature plasma catalysis technology has certain defects, pollutants are not completely degraded, the deodorization effect is limited, the ozone emission is difficult to control, although ozone also has a catalytic degradation effect on pollutants, the efficiency is low, only 10% of generated ozone generally participates in the catalytic degradation of malodorous gases, and the rest of ozone causes air pollution. For this reason, the industry has attempted to combine low temperature plasma catalytic degradation technology with catalyst catalytic technology, such as the synergy of low temperature plasma with unsupported catalysts, such as O 3 、MnO 2 Or the low-temperature plasma is cooperated with a supported carbon-based catalyst, such as activated carbon loaded with transition metals, rare metals and metal oxides, and the carbon-based catalyst is a catalyst taking the activated carbon as a matrix.
However, no matter the low-temperature plasma is adopted for concerted catalysis with a non-supported catalyst or concerted catalysis with a supported carbon-based catalyst, the degradation treatment effect on malodorous gas is still limited, and the problem of secondary pollution of byproduct ozone cannot be solved.
Disclosure of Invention
In order to improve the degradation treatment effect of low-temperature plasma and catalyst cooperation on malodorous gas, the application provides a low-temperature plasma catalytic degradation malodorous gas treatment device and a malodorous gas treatment method.
In a first aspect, the present application provides a low-temperature plasma catalytic degradation malodorous gas treatment device, which adopts the following technical scheme:
a low-temperature plasma catalytic degradation malodorous gas treatment device comprises:
the box body is provided with an air inlet and an air outlet;
the plasma catalytic degradation area is arranged in the box body and communicated with the air inlet, a plasma generator is arranged in the plasma catalytic degradation area and used for generating plasma and ionizing air to generate ozone, and a transition metal oxide coating is coated on the inner wall of the box body in the area where the plasma catalytic degradation area is located;
the active carbon treatment subassembly, set up in separate gas outlet and plasma catalytic degradation district in the box for unite ozone and plasma concerted catalysis degradation foul gas, the active carbon treatment subassembly is including the catalytic zone that is close to plasma catalytic degradation district and the degradation district that is close to the gas outlet, the catalytic zone all is filled with charcoal base catalyst with the degradation district, the load has the metallic oxide who has catalytic degradation ozone effect in the charcoal base catalyst, the catalytic zone is used for catalytic degradation foul gas, the degradation district is used for adsorbing and the remaining ozone of catalytic degradation.
By adopting the technical scheme, when the equipment operates, the plasma generator discharges to generate low-temperature plasma and ionizes air to generate ozone active molecules and strong oxidizing intermediates, wherein the low-temperature plasma and the ozone active molecules and the strong oxidizing intermediates comprise charged particles (electrons, anions and cations), metastable (excited) atoms and active groups and photons with different wavelengths, the ozone also has a catalytic effect on the degradation of pollutants, the transition metal oxide coating is used as a catalyst and has a synergistic effect with the plasma and the ozone, and after the malodorous gas enters the box body, the low-temperature plasma, the ozone, the transition metal oxide coating and the carbon-based catalyst are mutually combined to carry out catalytic degradation on the malodorous gas, and the degradation zone in the active carbon treatment component can adsorb and catalytically decompose residual small-molecule malodorous gas and residual excessive ozone as the final treatment stage in the malodorous gas treatment process of the equipment, so that secondary pollution is greatly reduced; the residual pollutants are catalytically degraded by combining the excessive ozone generated in the low-temperature plasma and the ionization process thereof with the transition metal oxide and the carbon-based catalyst, the treatment efficiency of the malodorous gas is high, the energy consumption of the plasma is reduced, the ozone generated when the plasma generator works is fully utilized, the pollutants and the ozone are removed simultaneously, and the method has the advantages of high energy efficiency, good treatment effect, high degradation efficiency, mild reaction conditions, high selectivity of the malodorous gas and easiness in implementation, and is particularly suitable for treating the low-concentration malodorous gas.
Optionally, the metal oxide in the metal oxide coating comprises TiO 2 、Al 2 O 3 、MnO 2 And Fe 3 O 4 One or more of the above.
By adopting the technical scheme, a large number of active reaction sites exist on the surfaces of the metal oxides, and the metal elements have changeable valence states, so that ozone is decomposed to form OH or other active groups, the synergistic catalysis effect with ozone is good, and the catalytic effect and the catalytic efficiency of malodorous gas are improved.
Optionally, the metal oxide in the metal oxide coating is MnO 2 。
Tested, mnO 2 Better catalytic action with ozone, and MnO 2 The cost is lower.
Optionally, the plasma generator is fixed in the box in a suspended manner.
By adopting the technical scheme, the interference of the internal structure of the box body on the plasma electric field can be reduced, the heat transfer surface of the plasma generator is reduced, and the heat damage to the internal structure of the box body during the operation of the plasma generator is effectively reduced.
It is optional, the active carbon treatment subassembly is including setting up the active carbon groove in the box and filling the charcoal base catalyst in the active carbon groove, the charcoal base catalyst comprises filling in the first active carbon packing layer that the active carbon groove is close to plasma catalytic degradation district one side and filling the second active carbon packing layer that is close to gas outlet one side in the active carbon groove, first active carbon packing layer place region is catalytic zone, the regional degradation district that is in second active carbon packing layer place, the lateral part in active carbon groove and the inner wall butt of box separate plasma catalytic degradation district and gas outlet, a plurality of through-holes have on the lateral wall in active carbon groove.
Through adopting above-mentioned technical scheme, the lateral part in activated carbon groove and the inner wall butt of box, thereby guarantee that foul gas must pass through the catalytic degradation and the adsorption treatment of active carbon treatment subassembly before discharging from the gas outlet, first active carbon packing layer and second active carbon layer are charcoal-based catalyst promptly, the active carbon loaded metal oxide in the catalytic zone can unite ozone catalytic degradation foul gas, the active carbon loaded metal oxide in the degradation zone can adsorb the micromolecule foul gas and the excessive ozone that aforementioned catalytic degradation reaction produced, and with adsorbed micromolecule foul gas and excessive ozone catalytic decomposition, also have certain catalytic degradation effect to remaining foul gas simultaneously.
Optionally, the metal oxide loaded in the first activated carbon filler layer includes one or a combination of several of silver metal oxide, nickel metal oxide, iron metal oxide, cobalt metal oxide, manganese metal oxide, copper metal oxide, lead metal oxide, bismuth metal oxide, tin metal oxide, and vanadium metal oxide, and the metal oxide loaded in the second activated carbon filler layer includes one or a combination of several of manganese metal oxide, cobalt metal oxide, copper metal oxide, iron metal oxide, nickel metal oxide, silver metal oxide, palladium metal oxide, rhodium metal oxide, and platinum metal oxide.
Optionally, the metal oxides loaded in the first activated carbon filler layer and the second activated carbon filler layer are both manganese metal oxide and copper metal oxide, the mass ratio of the copper element in the first activated carbon filler layer is greater than the mass ratio of the manganese element, and the mass ratio of the manganese element in the second activated carbon filler layer is greater than the mass ratio of the copper element.
Tests prove that the effect of degrading malodorous gas by combining oxides of Mn and Cu with ozone catalysis is best, and MnO is 2 The reaction rate is higher, the activity is higher, the catalytic effect is better when the activated carbon packing layer is used as an ozone decomposition catalyst, the mass ratio of the copper element in the first activated carbon packing layer is larger than that of the manganese element, the activated carbon packing layer is mainly used for catalytically degrading malodorous gas by using combined ozone, and the mass ratio of the manganese element in the second activated carbon packing layer is larger than that of the copper element, and the activated carbon packing layer is mainly used for catalytically degrading residual ozone.
Optionally, the metal oxides loaded in the first activated carbon filler layer and the second activated carbon filler layer are MnO 2 And CuO.
Optionally, the top opening of the box body is detachably provided with a top cover, and when the top cover covers the top opening of the box body, the top of the activated carbon groove is abutted to and sealed with the lower surface of the top cover.
Through adopting above-mentioned technical scheme, the setting of top cap is convenient for regularly change the active carbon in the active carbon groove to guarantee foul gas's treatment effect.
Optionally, low temperature plasma catalytic degradation foul gas treatment facility still includes accuse temperature heating element, accuse temperature heating element includes heating rod, temperature-sensing probe and temperature detect switch, heating rod and temperature-sensing probe all set up in the box and lie in between plasma catalytic degradation district and the active carbon treatment component, temperature detect switch sets up in the box outer wall, heating rod and temperature-sensing probe electric connection respectively in temperature detect switch, temperature-sensing probe can output temperature signal, temperature detect switch can be according to temperature signal to heating rod output control instruction to make the heating rod switch operating condition.
By adopting the technical scheme, the heating rod releases heat after being electrified, the temperature sensing probe senses the ambient temperature, when the temperature reaches a preset value, the temperature sensing probe outputs a temperature signal to the temperature control switch to power off the heating rod, and when the temperature is lower than the preset value, the temperature sensing probe outputs a temperature signal to the temperature control switch to electrify the heating rod for heating; the method of heating air is adopted to provide energy for each catalytic degradation reaction in the equipment, so that each reaction can obtain enough activation energy more easily to accelerate the reaction, the equipment can react with more malodorous gas in shorter time, the degradation of malodorous gas molecules is accelerated, and the treatment efficiency is improved; the temperature rise is also beneficial to shortening the half-life period of ozone decomposition, accelerating the decomposition of ozone and reducing the residual quantity of ozone, the ozone needs about 30 minutes for complete decomposition at normal temperature, the decomposition rate of the ozone is accelerated after the temperature rise, and the complete decomposition time is less than 30 minutes; meanwhile, the temperature rise is also beneficial to improving the adsorption speed of the carbon-based catalyst, so that the total processing time of single-batch malodorous gas in the equipment is only 8 to 15 minutes, and the tail gas has no secondary pollution such as ozone and the like, thereby being safer and more environment-friendly.
Optionally, an activated carbon partition plate is arranged between the plasma catalytic degradation zone and the activated carbon treatment assembly, a side edge of the activated carbon partition plate abuts against the inner wall of the box body and separates the plasma catalytic degradation zone from the activated carbon treatment assembly, and a gas guide port is arranged on one side edge of the activated carbon partition plate abutting against the inner wall of the box body;
a plasma partition plate is arranged in the plasma catalytic degradation zone, one end of the plasma partition plate is connected to one side, close to the gas guide port, of the box body, the other end of the plasma partition plate extends along one side, close to the activated carbon partition plate, far away from the gas guide port, and a gap is formed between the other end of the plasma partition plate and the box body as well as the activated carbon partition plate;
the plasma treatment device is characterized in that a heating area is formed between the plasma partition plate and the activated carbon partition plate, the heating area is communicated with the plasma catalytic degradation area, the heating area is communicated with the area where the activated carbon treatment assembly is located through the air guide port, and the heating rod and the temperature sensing probe are located in the heating area.
Through adopting above-mentioned technical scheme, the flow in-process of foul gas passes through plasma catalytic degradation district, the zone of heating, leads gas port, active carbon processing subassembly in proper order, because the intercommunication department of plasma catalytic degradation district and the zone of heating is located the one side of keeping away from leading the gas port, therefore the flow path of foul gas is "Z" style of calligraphy and buckles to prolonged the time that the foul gas stayed in the zone of heating, be favorable to improving foul gas catalytic degradation's effect and efficiency.
Optionally, one side of the activated carbon partition plate, which is far away from the gas guide port, is bent towards the direction close to the plasma catalytic degradation area to form an arc.
Through adopting above-mentioned technical scheme, the arc design that the gas guide port one side was kept away from to the active carbon baffle can play the guide effect to foul gas, makes foul gas more gently flow to the zone of heating.
In a second aspect, the present application provides a method for treating malodorous gas, which adopts the following technical scheme:
a malodorous gas treatment method is implemented by adopting the technical scheme and comprises the following steps:
conveying the malodorous gas from the gas inlet to the plasma catalytic zone, discharging by the plasma generator to generate plasma and ionizing air to generate ozone, wherein when the malodorous gas passes through the plasma catalytic zone, the plasma, the ozone and the transition metal oxide coating on the inner wall of the box body jointly catalyze and degrade the malodorous gas;
the malodorous gas passing through the plasma catalysis area flows to an activated carbon treatment component filled with a metal oxide carbon-based catalyst with a reduction effect, the carbon-based catalyst in the catalytic degradation area further carries out catalytic degradation on the malodorous gas, then the residual excessive ozone is adsorbed and catalytically converted into oxygen by the carbon-based catalyst in the adsorption area, and the tail gas is discharged from the gas outlet.
By adopting the technical scheme, the combined catalytic degradation of low-temperature plasma and transition metal oxide, the combined catalytic degradation of low-temperature plasma and carbon-based catalyst, the combined catalytic degradation of ozone and carbon-based catalyst, and the common catalytic degradation of low-temperature plasma, ozone, transition metal oxide coating and carbon-based catalyst exist in the catalytic degradation process of malodorous gas, residual pollutants are catalytically degraded by using the excessive ozone generated in the low-temperature plasma and the ionization process thereof, the transition metal oxide and the carbon-based catalyst, the malodorous gas treatment efficiency is high, the treatment effect is good, especially the treatment effect on malodorous gas with large air volume, low concentration and strong peculiar smell is better, the ozone generated when a plasma generator works is fully utilized in the treatment process of malodorous gas, and the secondary pollution caused by the ozone generated when the plasma generator runs is greatly reduced.
Optionally, be equipped with the zone of heating between plasma catalytic degradation district and the active carbon treatment component, the foul gas gets into the zone of heating after flowing out from plasma catalytic degradation district and heats, then flows to the active carbon treatment component.
Through adopting above-mentioned technical scheme, heat foul gas and can provide the temperature condition for catalytic degradation reaction to reaction is gone on with higher speed, improves the treatment effeciency, and higher temperature still is favorable to shortening ozonolysis 'half-life, accelerates the decomposition of ozone, has reduced the residual amount of ozone, and simultaneously, the intensification also is favorable to improving the adsorption rate of charcoal base catalyst, reduces single batch foul gas's treatment time.
Optionally, the heating temperature is controlled to be 50-90 ℃.
Tests show that when the temperature is too high, the equipment loss is increased, the treatment of the malodorous gas is not facilitated, even danger is possibly caused, the temperature is controlled to be between 50 and 90 ℃, the treatment effect on the malodorous gas is good, the equipment loss is small, and the treatment effect on the malodorous gas, the equipment loss and the energy consumption are more balanced.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the equipment utilizes the low-temperature plasma and the excessive ozone generated in the ionization process thereof to carry out combined catalytic degradation with the transition metal oxide and the carbon-based catalyst to degrade residual pollutants, realizes the combined catalytic degradation of the low-temperature plasma and the transition metal oxide, the combined catalytic degradation of the low-temperature plasma and the carbon-based catalyst, the combined catalytic degradation of the ozone and the carbon-based catalyst and the common catalytic degradation of the low-temperature plasma, the ozone, the transition metal oxide coating and the carbon-based catalyst when the equipment operates, and carries out adsorption treatment on waste gas through a degradation zone in an active carbon treatment component before the waste gas is discharged, so that residual micromolecule malodorous gas and residual excessive ozone are decomposed, secondary pollution is effectively avoided, the ozone generated when a plasma generator works is fully utilized, the simultaneous removal of the pollutants and the ozone is realized, and the equipment has the advantages of high energy efficiency, good treatment effect, high degradation efficiency, mild reaction conditions, high malodorous gas selectivity and easy implementation.
2. The heating zone is arranged in the equipment to provide a temperature condition for catalytic degradation reaction, so that the reaction is accelerated, the degradation of malodorous gas molecules is accelerated, the treatment efficiency is improved, and the adsorption speed of the carbon-based catalyst is improved, so that the total treatment time of the malodorous gas in a single batch of the equipment is only 8 to 15 minutes, meanwhile, the half-life period of ozone can be shortened due to the temperature rise, the decomposition of the ozone is accelerated, and the residual quantity of the ozone is reduced.
3. The method for treating the malodorous gas utilizes low-temperature plasma and excessive ozone generated in the ionization process of the low-temperature plasma, the transition metal oxide and the carbon-based catalyst to jointly catalyze and degrade residual pollutants, the malodorous gas is high in treatment efficiency and good in treatment effect, and has obvious treatment effect on various malodorous pollutants, the application range is wide, especially, the treatment effect on the malodorous gas with large wind volume, low concentration and strong peculiar smell is better, the ozone generated when a plasma generator works is fully utilized in the treatment process of the malodorous gas, and the secondary pollution caused by the ozone generated when the plasma generator operates is greatly reduced.
Drawings
FIG. 1 is an overall schematic diagram of a low-temperature plasma catalytic degradation malodorous gas treatment device in the embodiment of the present application;
FIG. 2 is a schematic sectional view of a low-temperature plasma catalytic degradation malodorous gas treatment device in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a plasma partition plate, a power supply partition plate and an activated carbon partition plate in the low-temperature plasma catalytic degradation malodorous gas treatment device in the embodiment of the present application;
FIG. 4 is a schematic structural diagram of another view angle of the plasma partition plate, the power supply partition plate and the activated carbon partition plate in the low-temperature plasma catalytic degradation malodorous gas treatment device in the embodiment of the present application;
FIG. 5 is an exploded view of a heating rod and a protective sleeve in the low-temperature plasma catalytic degradation malodorous gas treatment device in the embodiment of the present application;
FIG. 6 is a schematic view of the internal structure of the box body in the low-temperature plasma catalytic degradation malodorous gas treatment device in the embodiment of the present application;
FIG. 7 is a schematic structural diagram of a low-temperature plasma catalytic degradation malodorous gas treatment device according to an embodiment of the present application, in which activated carbon is not filled in an activated carbon tank;
FIG. 8 is a schematic structural diagram of a low-temperature plasma catalytic degradation malodorous gas treatment device in which an activated carbon tank is filled with activated carbon according to an embodiment of the present application;
FIG. 9 is a schematic flow diagram of gas in the low-temperature plasma catalytic degradation malodorous gas treatment device in the embodiment of the present application;
description of the reference numerals: 1. a box body; 11. an air inlet; 12. an air outlet; 13. a top cover; 14. a fixing member; 15. a support plate; 16. a limiting plate; 17. positioning a plate; 2. a plasma catalytic degradation zone; 31. a plasma generator; 32. a power adapter; 33. a plasma barrier; 34. a power supply separator; 4. a heating zone; 51. a heating rod; 511. a protective sleeve; 52. a temperature sensing probe; 53. a temperature control switch; 54. a wire; 61. an activated carbon tank; 611. a through hole; 62. a first activated carbon filler layer; 63. a second activated carbon filler layer; 64. a catalytic zone; 65. a degradation zone; 7. an activated carbon separator; 71. and an air guide port.
Detailed Description
In the following description of the present application in further detail with reference to the accompanying drawings, it should be noted that if directional indications (such as upper, lower, left, right, front, back, 8230; etc.) are referred to in the embodiments of the present application, the directional indications are only used for explaining the relative positional relationship, movement, etc. of the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.
The embodiment of the application discloses a low-temperature plasma catalytic degradation malodorous gas treatment device. Referring to fig. 1 and 2, the low-temperature plasma catalytic degradation malodorous gas treatment device comprises a box body 1, a plasma catalytic degradation zone 2 arranged in the box body 1, a heating zone 4 arranged in the box body 1, and an activated carbon treatment assembly arranged in the box body 1.
Referring to fig. 2, the top of the box body 1 is in an open state and is detachably mounted with a top cover 13, a fixing member 14 is mounted on the top cover 13, and the fixing member 14 is fixed by a bolt to fixedly connect the top cover 13 with the box body 1 and to form a sealed state at the joint of the top cover 13 and the box body 1.
Wherein one end of box 1 is equipped with air inlet 11, and the other end of box 1 is equipped with gas outlet 12, and plasma catalytic degradation district 2, heating zone 4 and active carbon treatment component set gradually along the direction of air inlet 11 to gas outlet 12.
The plasma catalytic degradation zone 2 is communicated with the air inlet 11, the plasma generator 31 is installed in the plasma catalytic degradation zone 2, the plasma generator 31 is electrically connected with a power supply device, in the embodiment, the power supply device is a power adapter 32, in other embodiments, the power supply device can also be a combination of the power adapter 32 and a power box, the power adapter 32 is connected with a power supply to supply power to the plasma generator 31, so that the plasma generator 31 discharges to generate low-temperature plasma and ionizes surrounding air to generate ozone.
Referring to fig. 2 and 3, a plasma partition plate 33 is installed in the plasma catalytic degradation zone 2 along the vertical direction, one end of the plasma partition plate 33 is fixedly connected to the box body 1 through a bolt, the bottom of the plasma partition plate 33 abuts against the bottom of the inner wall of the box body 1, the plasma generator 31 is fixedly installed on one surface of the plasma partition plate 33 through a bolt, and the air inlet 11 is communicated with an area where the plasma generator 31 is installed on the plasma partition plate 33. The plasma generator 31 only forms a contact point with the plasma partition plate 33 through a bolt, so that the plasma generator 31 is in a suspended installation state, the interference of the plasma partition plate 33 to a plasma electric field is reduced, the heat transfer surface of the plasma generator 31 to the internal structure of the box body 1 is reduced, and the heat damage to the internal structure of the box body 1 during the operation of the plasma generator 31 is reduced.
A power supply partition plate 34 is horizontally mounted above the plasma partition plate 33, and the top of the plasma partition plate 33 abuts against the lower surface of the power supply partition plate 34. The power adapter 32 is fixedly arranged on the upper surface of the power partition plate 34, the air inlet 11 is communicated with the area below the power partition plate 34, and the power adapter 32 is separated from the plasma generator 31 and the plasma catalytic degradation area 2 by the power partition plate 34, so that the power adapter 32 is prevented from being corroded by malodorous gas for a long time and prevented from being aged by radiation when the plasma generator 31 operates.
The inner wall of the box body 1 in the area of the plasma catalytic degradation area 2 is coated with a transition metal oxide coating, in the embodiment, mnO is adopted as the transition metal oxide coating 2 Coating of MnO 2 The coating is controlled to be 2 to 3mm, and MnO is adopted 2 For the analytical grade, the malodorous gas is uniformly mixed with a liquid adhesive in a volume ratio of 1.
In other embodiments, the transition metal oxide coating may also employ TiO 2 、Al 2 O 3 And Fe 3 O 4 Or a mixture of several of them may be used for coating.
Referring to fig. 2 and 4, an activated carbon partition plate 7 is fixedly installed in the box body 1 along the vertical direction, the activated carbon partition plate 7 is located between the plasma catalytic degradation zone 2 and the activated carbon treatment assembly, the side of the activated carbon partition plate 7 abuts against the inner wall of the box body 1, so that the plasma catalytic degradation zone 2 is separated from the activated carbon treatment assembly, and one end of the power supply partition plate 34, which is far away from the air inlet 11, abuts against one surface of the activated carbon partition plate 7, which faces the plasma catalytic degradation zone 2.
One side edge of the activated carbon partition plate 7 is provided with an air guide port 71, the air guide port 71 enables the areas of the two side surfaces of the activated carbon partition plate 7 to be communicated, one end of the plasma partition plate 33 is connected to one side of the box body 1 close to the air guide port 71, the other end of the plasma partition plate 33 extends along one side close to the activated carbon partition plate 7 far away from the air guide port 71, and the area among the plasma partition plate 33, the activated carbon partition plate 7 and the power supply partition plate 34 is a heating area 4. Gaps are reserved between one end of the plasma partition plate 33 close to the activated carbon partition plate 7 and the box body 1 and the activated carbon partition plate 7, so that the plasma catalytic degradation zone 2 is communicated with the heating zone 4.
Referring to fig. 2, a heating rod 51 and a temperature sensing probe 52 are installed in the heating area 4, and both the heating rod 51 and the temperature sensing probe 52 are electrically connected to a temperature control switch 53 through a lead 54. The heating rod 51 is used for heating the gas in the heating area 4, the temperature sensing probe 52 can output a temperature signal, and the temperature control switch 53 can output a control command to the heating rod 51 according to the temperature signal so as to switch the operating state of the heating rod 51. The heating rod 51 generates heat after being electrified, the temperature sensing probe 52 senses the surrounding temperature, when the temperature reaches a preset value, the temperature sensing probe 52 outputs a temperature signal to the temperature control switch 53 to cut off the power of the heating rod 51, and when the temperature is lower than the preset value, the temperature sensing probe 52 outputs a temperature signal to the temperature control switch 53 to electrify the heating rod 51 for heating.
Referring to fig. 5, the outer wall of the lead 54 is coated with an insulating rubber for protection, the temperature control switch 53 is installed on the power supply partition 34 so as to be separated from the heating rod 51 to prevent the corrosion of the malodorous gas and heat, and the knob of the temperature control switch 53 is passed through the outer wall of the cabinet 1 to be operated. The heating rod 51 is suspended in the box 1 through a wire 54 connected with a temperature control switch 53, so as to prevent thermal erosion to the internal structure of the box 1 and improve the heating effect.
The outside cover of heating rod 51 is equipped with the protective sheath 511 of red copper material in order being used for protecting heating rod 51, prevents that foul gas from causing the corruption to heating rod 51. The temperature sensing probe 52 is fixedly attached to the outer wall of the protective cover 511, so that the temperature can be detected more accurately.
The side of the plasma baffle 33, the side of the power baffle 34 and the side of the activated carbon baffle 7 are all in a sealing state with the inner wall of the box body 1 in a propping manner, so that the malodorous gas is ensured to enter from the gas inlet 11 and then sequentially pass through the plasma catalytic degradation zone 2, the heating zone 4, the gas guide port 71 and the activated carbon treatment assembly, and finally is discharged from the gas outlet 12.
Because the intercommunication department and the gas guide mouth 71 of plasma catalytic degradation district 2 and heating zone 4 are in the both sides of box 1, and then increased the time that foul gas stops in heating zone 4, the heating effect is better.
Referring to fig. 3, in order to make the malodorous gas flow to the heating zone 4 more smoothly, one side of the activated carbon partition 7 away from the gas guide opening 71 is curved to form an arc shape toward the plasma catalytic degradation zone 2.
Referring to fig. 6, in this embodiment, the plasma partition 33, the power partition 34 and the activated carbon partition 7 are integrated, a supporting plate 15 is fixedly installed on two opposite inner walls of the box body 1 through bolts, a lower surface of the power partition 34 abuts against an upper surface of the supporting plate 15, a limiting plate 16 is fixedly installed on the inner wall of one side of the box body 1 close to the air guide opening 71 through bolts, one surface of the activated carbon partition 7 facing the activated carbon processing assembly abuts against the limiting plate 16, the power partition 34 is supported through the supporting plate 15 during installation, and the activated carbon partition 7 is supported and limited through the limiting plate 16. In other embodiments, the plasma partition 33, the power supply partition 34, and the activated carbon partition 7 may be separated from each other, and may be fixed by bolts during installation.
Referring to fig. 6 to 8, the activated carbon treatment assembly includes an activated carbon groove 61 installed in the box body 1 and having an open top, and a first activated carbon filler layer 62 and a second activated carbon filler layer 63 filled in the activated carbon groove 61, wherein the activated carbon groove 61 is located between the activated carbon partition plate 7 and the air outlet 12. Two positioning plates 17 are fixedly arranged on two opposite inner walls of the box body 1 through bolts, and the activated carbon grooves 61 are clamped and fixed by the four positioning plates 17. A plurality of through holes 611 are uniformly spaced on the sidewall of the activated carbon groove 61, so that the gas can pass through the activated carbon groove 61 through the through holes 611.
The first activated carbon filler layer 62 is filled in the area of the activated carbon groove 61 close to the heating area 4, the second activated carbon filler layer 63 is filled in the area of the activated carbon groove 61 close to the air outlet 12, the filling volumes of the first activated carbon filler layer 62 and the second activated carbon filler layer 63 are equal, the area of the first activated carbon filler layer 62 is a catalytic area 64, and the area of the second activated carbon filler layer 63 is a degradation area 65. After entering the activated carbon groove 61, the gas must first pass through the catalytic region 64 of the first activated carbon filler layer 62 to enter the degradation region 65 of the second activated carbon filler layer 63. MnO is loaded in both the first active carbon filler layer 62 and the second active carbon filler layer 63 2 And CuO, and the mass ratio of copper element in the first active carbon filler layer 62 is greater than that of manganese element, and is mainly used for catalytically degrading malodorous gas by combined ozoneThe mass ratio of manganese element in the secondary activated carbon filler layer 63 is larger than that of copper element, and the secondary activated carbon filler layer is mainly used for catalyzing and degrading residual ozone.
In other embodiments, the first activated carbon filler layer 62 may further support one of silver metal oxide, nickel metal oxide, iron metal oxide, cobalt metal oxide, lead metal oxide, bismuth metal oxide, tin metal oxide, and vanadium metal oxide, or a combination of several of them. The second activated carbon filler layer 63 may further contain one or a combination of cobalt metal oxide, iron metal oxide, nickel metal oxide, silver metal oxide, palladium metal oxide, rhodium metal oxide, and platinum metal oxide.
Referring to fig. 2, the bottom of the activated carbon groove 61 abuts against the bottom of the inner wall of the box body 1 to realize sealing, the two side portions of the activated carbon groove 61 abut against the inner walls of the two sides of the box body 1 to realize sealing, and when the top cover 13 covers the opening of the box body 1, the top of the activated carbon groove 61 abuts against the lower surface of the top cover 13 to realize sealing, so that the possibility that gas is directly discharged from the gas outlet 12 through a gap between the activated carbon groove 61 and the box body 1 or the top cover 13 is reduced, and the treatment efficiency of malodorous gas is prevented from being affected.
The implementation principle of the low-temperature plasma catalytic degradation malodorous gas treatment equipment in the embodiment of the application is as follows: referring to fig. 9, when malodorous gas is treated, the malodorous gas enters the plasma catalytic degradation zone 2 from the gas inlet 11, the plasma generator 31 discharges electricity to generate low-temperature plasma and ionizes air to generate active molecules such as ozone and strong oxidizing intermediates such as O 3 、O 2 + Active molecules such as O (1D), O (3P),. OH and. H, ozone and the like and strong oxidizing intermediate have the oxidizing and degrading effects on pollutants, mnO 2 The coating is used as a catalyst, has synergistic effect with the plasma and ozone, and the low-temperature plasma, the ozone and the transition metal oxide coating are mutually combined to carry out catalytic degradation on malodorous gas, wherein the malodorous gas comprises the low-temperature plasma and MnO 2 The combined catalytic degradation of the low-temperature plasma and the ozone, the ozone and the MnO 2 Combined catalytic degradation, low temperature, etcPlasma, ozone, mnO 2 The combined catalytic degradation mode catalytically degrades malodorous molecules and VOCs, fully utilizes ozone generated by the plasma generator 31 during working, and reduces plasma energy consumption.
Then the malodorous gas enters the heating zone 4, the heating rod 51 heats to provide energy for the catalytic degradation reactions, so that each catalytic degradation reaction can obtain enough activation energy more easily to accelerate the reaction, and the reaction with more malodorous gas can be carried out in a shorter time, thereby accelerating the degradation of malodorous gas molecules and improving the treatment efficiency; and the temperature rise is also beneficial to shortening the half-life period of ozone decomposition, accelerating the decomposition of ozone and reducing the residual quantity of ozone, the complete decomposition of ozone at normal temperature needs about 30 minutes, the decomposition rate of ozone is accelerated after the temperature rise, the complete decomposition time is less than 30 minutes, and meanwhile, the temperature rise is also beneficial to improving the adsorption speed of the carbon-based catalyst, so that the total treatment time of malodorous gas in a single batch of the equipment is only 8 to 15 minutes.
The heated malodorous gas enters an activated carbon groove 61 through an air guide opening 71, and MnO is loaded on the activated carbon in the catalytic area 64 2 And CuO, can be used for catalytically degrading malodorous gases by combining ozone and low-temperature plasma, and the activated carbon in the degradation zone 65 is also loaded with MnO 2 And CuO, which is mainly used for adsorbing and decomposing the small molecular malodorous gas and the excessive ozone generated by the catalytic degradation reaction, thereby reducing secondary pollution and having a certain catalytic degradation effect on the residual malodorous gas.
When the malodorous gas is in the plasma catalytic degradation zone 2, the heating zone 4 and the activated carbon groove 61, the various combined catalytic reactions are carried out all the time, the malodorous gas is catalytically degraded by the combined action of multiple combined catalytic modes, and the sealing structure of the plasma partition plate 33, the power partition plate 34, the activated carbon partition plate 7 and the activated carbon groove 61 during installation can ensure that the malodorous gas sequentially passes through the plasma catalytic degradation zone 2, the heating zone 4 and the activated carbon groove 61, thereby reducing the possibility of environmental protection accidents caused by the dissipation of the malodorous gas.
The embodiment of the application also discloses a malodorous gas treatment method, which is implemented by the low-temperature plasma catalytic degradation malodorous gas treatment equipment in the embodiment, and comprises the following specific steps:
referring to fig. 9, the malodorous gas is transported from the gas inlet 11 to the plasma catalytic degradation zone 2, the plasma generator 31 discharges to generate plasma and ionizes the air to generate ozone, and the plasma, the ozone and MnO on the inner wall of the case 1 are generated when the malodorous gas passes through the plasma catalytic degradation zone 2 2 The coating jointly catalyzes the malodorous gas, then the malodorous gas flows to the heating area 4 to be heated, so as to provide temperature conditions for catalytic degradation reaction, the catalytic degradation reaction can obtain enough activation energy more easily, and the reaction can be accelerated, then the waste gas flows to the activated carbon groove 61, mnO is loaded in the catalytic area 64 2 And CuO, wherein the mass ratio of copper element is larger than that of manganese element, and then the active carbon is carried out degradation by MnO loaded in a degradation zone 65 2 And CuO, wherein the mass ratio of the manganese element is greater than that of the copper element, and the residual tail gas is discharged from the gas outlet 12.
The implementation principle of the malodorous gas treatment method in the embodiment of the application is as follows: utilizing low temperature plasma and excess ozone and MnO generated during ionization process thereof 2 And the activated carbon loaded with metal oxide is combined with catalytic degradation to residual pollutants, so that the treatment efficiency of the malodorous gas is high, the treatment effect is good, the treatment effect on various malodorous pollutants is obvious, the application range is wide, particularly, the treatment effect on the malodorous gas with large air volume, low concentration and strong odor is better, in addition, the ozone generated when the plasma generator 31 works is fully utilized in the treatment process of the malodorous gas, and the secondary pollution caused by the ozone generated when the plasma generator 31 operates is greatly reduced.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (4)
1. The utility model provides a low temperature plasma catalytic degradation foul gas treatment facility which characterized in that includes:
the refrigerator comprises a refrigerator body (1), wherein an air inlet (11) and an air outlet (12) are formed in the refrigerator body (1);
the plasma catalytic degradation zone (2) is arranged in the box body (1) and communicated with the air inlet (11), a plasma generator (31) is arranged in the plasma catalytic degradation zone (2), the plasma generator (31) is used for generating plasma and ionizing air to generate ozone, and a transition metal oxide coating is coated on the inner wall of the box body (1) in the area where the plasma catalytic degradation zone (2) is located;
the activated carbon treatment component is arranged in the box body (1), separates an air outlet (12) from the plasma catalytic degradation zone (2) and is used for combining ozone and plasma to catalyze and degrade malodorous gas in a synergetic mode, the activated carbon treatment component comprises a catalytic zone (64) close to the plasma catalytic degradation zone (2) and a degradation zone (65) close to the air outlet (12), the catalytic zone (64) and the degradation zone (65) are both filled with carbon-based catalysts, metal oxides with the ozone catalytic degradation function are loaded in the carbon-based catalysts, the catalytic zone (64) is used for catalytically degrading malodorous gas, and the degradation zone (65) is used for adsorbing and catalytically degrading residual ozone;
the activated carbon treatment component comprises an activated carbon groove (61) arranged in the box body (1) and a carbon-based catalyst filled in the activated carbon groove (61), the carbon-based catalyst consists of a first activated carbon filler layer (62) filled in the activated carbon groove (61) and close to one side of the plasma catalytic degradation zone (2) and a second activated carbon filler layer (63) filled in the activated carbon groove (61) and close to one side of the air outlet (12), the area where the first activated carbon filler layer (62) is located is a catalytic zone (64), the area where the second activated carbon filler layer (63) is located is a degradation zone (65), the side part of the activated carbon groove (61) is abutted against the inner wall of the box body (1) and separates the plasma catalytic degradation zone (2) from the air outlet (12), and a plurality of through holes (611) are formed in the side wall of the activated carbon groove (61);
an active carbon partition plate (7) is arranged between the plasma catalytic degradation area (2) and the active carbon treatment assembly, the side edge of the active carbon partition plate (7) is abutted against the inner wall of the box body (1) and separates the plasma catalytic degradation area (2) from the active carbon treatment assembly, and an air guide port (71) is arranged on one side edge of the active carbon partition plate (7) which is abutted against the inner wall of the box body (1);
a plasma partition plate (33) is arranged in the plasma catalytic degradation zone (2), one end of the plasma partition plate (33) is connected to one side, close to the gas guide port (71), of the box body (1), the other end of the plasma partition plate (33) extends along one side, close to the activated carbon partition plate (7), far away from the gas guide port (71), and a gap is formed between the other end of the plasma partition plate and the box body (1) as well as between the other end of the plasma partition plate (33) and the activated carbon partition plate (7);
a heating zone (4) is formed between the plasma partition plate (33) and the activated carbon partition plate (7), the heating zone (4) is communicated with the plasma catalytic degradation zone (2), and the heating zone (4) is communicated with the area where the activated carbon treatment assembly is located through an air guide port (71); one side of the activated carbon partition plate (7) far away from the air guide port (71) is bent towards the direction close to the plasma catalytic degradation area (2) to form an arc shape;
the metal oxide in the transition metal oxide coating is MnO 2 (ii) a The metal oxides loaded in the first activated carbon filler layer (62) and the second activated carbon filler layer (63) are MnO 2 And CuO; when the low-temperature plasma catalytic degradation malodorous gas treatment equipment is implemented, malodorous gas is conveyed to the plasma catalytic degradation area (2) from the air inlet (11), the plasma generator (31) discharges to generate plasma and ionizes air to generate ozone, and when the malodorous gas passes through the plasma catalytic degradation area (2), the plasma, the ozone and MnO of a transition metal oxide coating on the inner wall of the box body (1) are generated 2 The coating jointly catalyzes and degrades the malodorous gas, then the malodorous gas flows to a heating area (4) to be heated, thereby providing temperature conditions for the catalytic degradation reaction, enabling the catalytic degradation reaction to more easily obtain enough activation energy to accelerate the reaction, and then the reaction is carried out byThe malodorous gas passing through the plasma catalytic degradation zone (2) flows into an activated carbon tank (61) filled with an activated carbon treatment module containing a metal oxide carbon-based catalyst having a reducing action, and the carbon-based catalyst in the catalytic zone (64) is loaded with MnO 2 And CuO, wherein the mass ratio of the copper element is larger than that of the manganese element, so that the malodorous gas is further catalytically degraded, and then the malodorous gas passes through a carbon-based catalyst in a degradation zone (65) to be loaded with MnO 2 And the active carbon of CuO two metal compounds adsorbs residual micromolecule malodorous gas and excessive ozone and catalytically converts the residual micromolecule malodorous gas and the excessive ozone into oxygen, wherein the mass ratio of the manganese element is larger than that of the copper element, and tail gas is discharged from a gas outlet (12).
2. The low-temperature plasma catalytic degradation malodorous gas treatment device according to claim 1, wherein the plasma generator (31) is suspended and fixed in the box body (1).
3. A low-temperature plasma catalytic degradation malodorous gas treatment device according to claim 1, wherein the top of the box body (1) is open and is detachably provided with a top cover (13), and when the top cover (13) covers the top opening of the box body (1), the top of the activated carbon groove (61) is in butt seal with the lower surface of the top cover (13).
4. The low-temperature plasma catalytic degradation malodorous gas treatment equipment according to claim 1, further comprising a temperature control heating assembly, wherein the temperature control heating assembly comprises a heating rod (51), a temperature sensing probe (52) and a temperature control switch (53), the heating rod (51) and the temperature sensing probe (52) are both arranged in the box body (1) and are positioned between the plasma catalytic degradation zone (2) and the activated carbon treatment assembly, the temperature control switch (53) is arranged on the outer wall of the box body (1), the heating rod (51) and the temperature sensing probe (52) are respectively and electrically connected to the temperature control switch (53), the temperature sensing probe (52) can output a temperature signal, the temperature control switch (53) can output a control instruction to the heating rod (51) according to the temperature signal so as to switch the working state of the heating rod (51), and the heating rod (51) and the temperature sensing probe (52) are positioned in the heating zone (4).
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