CN107413175B - Method and device for purifying indoor volatile organic compounds through high-efficiency low-energy-consumption secondary-pollution-free low-temperature plasma concerted catalysis - Google Patents
Method and device for purifying indoor volatile organic compounds through high-efficiency low-energy-consumption secondary-pollution-free low-temperature plasma concerted catalysis Download PDFInfo
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Abstract
The invention discloses a method and a device for purifying indoor volatile organic compounds by low-temperature plasma concerted catalysis, which have high efficiency, low energy consumption and no secondary pollution, and belongs to the technical field of indoor air purification. The invention utilizes the adsorption/catalysis dual-function purification material component positioned in the main air pipe to efficiently adsorb and separate volatile organic compounds in indoor air for a long time at normal wind speed in the period of starting ventilation and purification of a building; in the time period when the building is not started to ventilate and purify, the low-temperature plasma is used for circulating and passing through the adsorption/catalysis dual-function purification material component in a short time under the condition of low wind speed, so that the adsorbed organic matters are completely oxidized into harmless or low-harmful substances; after the low-temperature plasma generator is closed, the circulating gas containing ozone continuously circulates through the adsorption/catalysis dual-function purification material component, so that the ozone is thoroughly decomposed. The method provided by the invention has the advantages of high conversion efficiency of the indoor volatile organic compounds, low energy consumption and capability of avoiding the release of secondary pollutants into indoor air.
Description
Technical Field
The invention relates to the technical field of indoor air purification, in particular to a method and a device for purifying indoor volatile organic compounds by low-temperature plasma concerted catalysis, which have high efficiency, low energy consumption and no secondary pollution.
Background
The existence of low-concentration Volatile Organic Compounds (VOCs) in a room is one of the main factors for deteriorating the quality of indoor air. The volatile organic compounds have great harm to human body and environment, and most of the volatile organic compounds not only stimulate the respiratory tract, eyes, nose and the like of human body, but also cause damage to organs such as nervous system, hematopoietic system, liver, kidney and the like to different degrees. The volatile organic compounds in the indoor air can be purified by room temperature adsorption and other methods which can decompose the organic compounds at room temperature. Room temperature adsorption is the most mature technology applied to low-concentration volatile organic compounds in indoor air at present, but the adsorption method has the problems that only organic compounds in a gas phase are transferred to the surface of a solid phase adsorbent, thorough purification is not realized, the adsorption capacity of the adsorbent is limited, and the adsorbent needs to be replaced periodically or regenerated to ensure long-term stable operation. In addition, the commonly used activated carbon adsorbents are prone to moisture absorption and require strict control of the relative humidity of the air. There are many reports on the oxidation of volatile organic compounds at room temperature. Although the catalytic oxidation of formaldehyde at room temperature has been in use, there is no technology that can efficiently convert benzene series into carbon dioxide and water. For most volatile organic compounds, the problems of low efficiency and incomplete degradation into harmless substances are common.
The low-temperature plasma concerted catalysis technology is that a catalyst is introduced into a low-temperature plasma system, and organic matters are purified by utilizing the concerted action between the low-temperature plasma and the catalyst. The synergistic effect is that the active particles in the low-temperature plasma can convert volatile organic compounds into harmless substances under the catalytic action. Chinese patent application No. 201110082007.9 discloses a reactor for treating VOCs in cooperation with plasma catalysis, which adopts a dielectric barrier discharge mode, uses a quartz glass tube as a cylinder body, wraps a metal conductor on the outer wall of the cylinder body as an external electrode for dielectric barrier discharge, sets a stainless steel tube in the middle of the cylinder body as an internal electrode for dielectric barrier discharge, and fills an adsorbent and a catalyst between discharge air gaps between the stainless steel tube and the glass tube, thereby realizing the high-efficiency purification of VOCs in low-concentration industrial waste gas. The Chinese patent with the application number of 201410674694.7 discloses a low-temperature plasma composite treatment system, which comprises a preprocessor, a negative ion purifier, a double-medium plasma processor, a high-energy ion processor and a composite catalytic device, wherein closed air chambers are respectively arranged in the preprocessor and the catalytic device, the air chambers are sequentially communicated, and a composite catalyst can decompose, adsorb and catalytically decompose residual ozone. The above all are continuous discharge straight-through structures, and organic matters can be catalytically oxidized by utilizing high-energy active particles in low-temperature plasma, but when the low-concentration volatile organic matters are treated by the connection mode, the continuous operation energy consumption of the low-temperature plasma is high, the airflow resistance is large when gas passes through the components, the ozone amount released by continuous discharge is large, and the airflow directly passes through the components to release part of incompletely oxidized organic matters and ozone to cause secondary pollution.
To reduce low temperaturePlasma energy consumption, many researchers are also studying the intermittent discharge type low-temperature plasma to purify VOCs. Kim Hyu-Ha et al (Kim H.H., Tsubata S., Date' M., et al. catalyst regeneration and activity enhancement of Au/TiO)2Applied catalysts A: General,2007,329: 93-98.) firstly proposes an adsorption-low temperature plasma catalytic regeneration technology, adopts an adsorbent with good adsorption and catalytic performance to adsorb VOCs firstly, and then regenerates the catalyst by using low temperature plasma.
Wengzheng Wang et al (Wenzheng Wang, Honglei Wang, Tianle Zhu, et al, remove of gas phase low-concentration toluene over Mn, Ag and Ce modified HZSM-5catalysts by periodic adsorption of adsorption and non-thermal plasma formation journal of Hazardous Materials,2015,292:70-78.) use Mn, Ag-loaded HZSM-5catalysts to perform batch adsorption storage-plasma in situ regeneration adsorption/catalyst on toluene, found that Mn-loaded catalysts have good performance in catalyzing the decomposition of toluene and ozone, and that the addition of Ag can increase the activity of the catalyst. Xingfan et Al (Xing Fan, titanium Zhu, Yifei Sun, et Al. the roles of vacuum plasma in the plasma and plasma-catalytic removal of low-concentration for plasma in air. journal of Hazardous Materials,2011,196: 380-; X.Fan, T.L.Zhu, M.Y.Wang, et Al. Removal of low-concentration BTX in air using aqueous plasma system. Chemosphere, 200975: 1301-1306.) studied the low temperature plasma-synergistic MnOx/Al synergistic2O3The low-concentration formaldehyde and benzene series in the air are catalytically degraded, and MnOx/Al is found2O3The introduction of the catalyst can obviously improve the conversion rate of formaldehyde and benzene, MnOx can also catalyze and decompose ozone, and the concentration of the ozone discharged at the outlet of the reaction system is far lower than the national standard. Kim Hyun-Ha et al (Hyun-Ha Kim, Yoshiyuki Teramoto, AtsushiOgata. time-delayed imaging of positive pulsed corona-induced surface reactors on TiO2andγ-Al2O3Journal of Physics D: Applied Physics,2016,49:415204) studied plasma-bound TiO2,4％Ag/TiO2,5％Ag/γ-A12O3And 5% Ag/MS-13X catalyst to remove benzene, and research shows that the Ag catalyst plays a role in storing and releasing oxygen species, and 5% Ag/gamma-Al2O3Has optimal activity. Roland u.et al (u.rolanda, f.holzera, a.
Combination of non-thermal plasma and heterologous Catalysis for oxidation of a lipid organic complex Part 3.Electron partial imaging reactions (EPR) study of plasma-treated lipid B: Environmental,2005,58:227-2O3The A-O-O superoxide radical with strong oxidizing property and long service life (existing for 14 days) is generated on the surface of the catalyst, and is helpful for the oxidative degradation of benzene series. Ag-MnOx/Al simultaneously loading Ag and MnOx2O3The catalyst is a good bifunctional catalyst for adsorbing/catalytically decomposing volatile organic compounds and ozone.
The intermittent adsorption storage-plasma in-situ regeneration system adopts a straight-through system, namely, low-temperature plasma generation and adsorption/catalysis dual-function purification materials are distributed in the main air duct. The adsorption/catalysis double-function purifying material firstly adsorbs and enriches and stores low-concentration volatile organic compounds, and then completely purifies the adsorbed organic compounds in a short discharge time by utilizing low-temperature plasma treatment. However, the purification method still has the problems that the resistance is large when the gas passes through the component, and the unconsumed ozone and incompletely oxidized organic matters are released into the air to cause secondary pollution and the like.
Disclosure of Invention
The invention provides a method and a device for purifying indoor volatile organic compounds through low-temperature plasma concerted catalysis, which have high efficiency, low energy consumption and no secondary pollution, aiming at the problems of high energy consumption, ozone release, large air resistance and the like in the process of purifying the volatile organic compounds through straight-through low-temperature plasma concerted catalysis in the prior art.
The method for purifying the indoor volatile organic compounds by the high-efficiency low-energy-consumption secondary-pollution-free low-temperature plasma concerted catalysis comprises the following steps:
the first step, in the time period of starting ventilation and purification of the building, indoor air passes through the main air duct at normal wind speed, and volatile organic compounds in the indoor air are efficiently adsorbed by the adsorption/catalysis dual-function purification material component arranged in the main air duct.
The normal wind speed is 1-3 m/s.
And secondly, in the time period when the ventilation and purification of the building are not started, indoor air does not enter a ventilation main air channel, the fan arranged on the bypass drives airflow to circulate through the adsorption/catalysis dual-function purification material component, a low-temperature plasma generator is started, low-temperature plasma containing ozone generated by high-voltage discharge passes through the adsorption/catalysis dual-function purification material component along with the circulating airflow under the condition of low air speed, organic matters in an adsorption state are oxidized and decomposed into harmless or low-harmful substances in a coordinated catalytic oxidation mode, and the adsorbability of the adsorption/catalysis dual-function purification material component is regenerated.
The low wind speed means that the wind speed is 0.05-0.2 m/s, and the cycle time is 0.5-2 h.
The low-temperature plasma generator adopts a bypass arrangement mode, namely is not arranged in the main air duct, so that the airflow resistance of the main air duct can be avoided, and the low-temperature plasma generator only generates low-temperature plasma through high-voltage discharge during oxidation regeneration, so that the discharge energy consumption can be reduced.
And thirdly, after the organic matters are completely oxidized, closing the low-temperature plasma generator, stopping discharging, and enabling the bypass gas to continuously circulate through the adsorption/catalysis dual-function purification material component at a low wind speed, so that the ozone is thoroughly decomposed, and secondary pollution caused by the fact that the ozone is released to indoor air is avoided.
The low wind speed means that the wind speed is 0.05-0.2 m/s, and the cycle time is 0.1-0.2 h.
The method provided by the invention can be used for alternately carrying out adsorption at room temperature and low-temperature plasma enhanced catalytic oxidation, and can meet the purification requirement of indoor air containing low-concentration volatile organic compounds.
The invention also provides a device for purifying the indoor volatile organic compounds by the synergy catalysis of the low-temperature plasma with high efficiency, low energy consumption and no secondary pollution, which comprises a main air pipe and an adsorption/catalysis dual-function purification material component, wherein one end of the main air pipe is an air inlet, and the other end of the main air pipe is an air outlet. Indoor air enters the main air pipe from the air inlet, passes through the adsorption/catalysis dual-function purification material component in the main air pipe, carries out gas phase adsorption separation on low-concentration volatile organic compounds in the indoor air, and clean air is discharged from the air outlet of the main air pipe and returns to the indoor environment again. The device also comprises a bypass, the bypass comprises a low-temperature plasma generator, a stop valve and a fan, the low-temperature plasma generator, the stop valve and the fan are sequentially connected through a bypass air pipe, circulating air flow on the bypass air pipe sequentially passes through the low-temperature plasma generator, the adsorption/catalysis dual-function purification material component, the stop valve and the fan, and an air outlet of the low-temperature plasma generator can be close to the adsorption/catalysis dual-function purification material component as far as possible.
The invention has the advantages that:
1. the indoor volatile organic compound conversion efficiency is high.
The invention efficiently adsorbs and separates volatile organic compounds in indoor air for a long time at normal wind speed (wind speed is 1-3 m/s) by utilizing an adsorption/catalysis dual-function purification material component positioned in a main air pipe in the period of starting ventilation and purification of a building; in the time period when the building is not started to ventilate and purify, the low-temperature plasma is circulated to pass through the adsorption/catalysis dual-function purification material component in a short time under the condition of low wind speed (0.05-0.2 m/s), so that the adsorbed organic matters are completely oxidized into harmless or low-harmful substances.
2. The energy consumption is low.
The low-temperature plasma generator is arranged in a bypass mode, namely not arranged in the main air pipe, so that resistance to air flow in the main air pipe is avoided, and energy consumption of a fan in the main air pipe is reduced; meanwhile, the discharge time of the bypass medium-low temperature plasma generator is short, so that the electric energy is saved; the wind speed of the circulating gas in the bypass wind pipe is low, and the low wind speed can reduce the energy consumption of the fan in the bypass.
3. Secondary pollution is avoided.
Under the condition of low wind speed, the low-temperature plasma circularly passes through the adsorption/catalysis dual-function purification material component to completely oxidize the organic matters into harmless or low-harmful substances; after the discharge is stopped, the gas containing incompletely consumed ozone continues to circulate through the adsorption/catalysis dual-function purification material component at a low wind speed, so that the ozone is completely decomposed into oxygen, and secondary pollutants are prevented from being released into indoor air.
Drawings
Fig. 1 is a schematic diagram of a process of adsorbing VOCs by the device for purifying indoor volatile organic compounds through low-temperature plasma synergetic catalysis with high efficiency, low energy consumption and no secondary pollution.
Fig. 2 is a schematic diagram of the process of oxidizing and degrading VOCs and decomposing ozone by low-temperature plasma of the device for purifying indoor volatile organic compounds by low-temperature plasma in a synergetic catalytic manner with high efficiency, low energy consumption and no secondary pollution.
In the figure:
1. a main air duct; 2. an adsorption/catalysis dual-function purification material component; 3. a low temperature plasma generator; 4. a fan; 5. a stop valve; 6. and bypassing the air pipe.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The invention firstly provides a device for purifying indoor volatile organic compounds by low-temperature plasma synergy catalysis with high efficiency, low energy consumption and no secondary pollution release, as shown in figure 1, the device comprises a main air pipe 1 and an adsorption/catalysis dual-function purification material component 2, one end of the main air pipe is an air inlet, indoor air enters the main air pipe 1 from the air inlet, the low-concentration volatile organic compounds in the indoor air are adsorbed through the adsorption/catalysis dual-function purification material component 2 in the main air pipe 1, and clean air is discharged from an air outlet of the main air pipe 1 and returns to the indoor again. In order to regenerate the adsorption performance of the adsorption/catalysis dual-function purification material component 2, the device of the invention comprises a bypass, as shown in fig. 2, the bypass comprises a low-temperature plasma generator 3, a fan 4 and a stop valve 5, which are connected through a bypass air pipe 6. And circulating airflow on the bypass air pipe 6 sequentially passes through the low-temperature plasma generator 3, the adsorption/catalysis dual-function purification material component 2, the stop valve 5 and the fan 4. Wherein, the gas outlet of the low-temperature plasma generator 3 can be close to the adsorption/catalysis dual-function purification material component 2 as much as possible.
Wherein the adsorption/catalysis dual-function purification material is 1% of Ag to 5% of Mn/gamma-Al2O31% Ag-3% Mn/ZSM-5 or 3% Ce-5% Mn/ZSM-5 material. In order to reduce air resistance, the fabric is prepared into a honeycomb shape. The adsorption/catalysis double-function purification material has the functions of high-efficiency adsorption, catalytic oxidation of VOCs in the presence of low-temperature plasma and catalytic decomposition of ozone.
The electrodes of the low-temperature plasma generator 3 are configured in a wire-cylinder type, a wire-plate type or a needle-hole plate type, and are usually assembled into a whole to form a corona discharge purification module, wherein the wire-shaped or needle-shaped discharge electrode is connected with the high-voltage end of a power supply, and the plate, the cylinder or the hole plate is a grounding electrode.
The power supply supplied by the corona discharge purification module is any one of a positive polarity direct current power supply and a negative polarity power supply, and the voltage range is 0kV to 10 kV.
The invention also provides a method for purifying indoor volatile organic compounds by the synergy catalysis of the low-temperature plasma with high efficiency, low energy consumption and no secondary pollution, which comprises the following steps:
in the time period of starting ventilation and purification of a building, the low-temperature plasma generator 3, the fan 4 and the stop valve 5 are in a closed state, as shown in fig. 1, under the normal wind speed (1 m/s-3 m/s), indoor air enters the main air pipe 1 and passes through the adsorption/catalysis dual-function purification material component 2, the efficient and long-time adsorption and separation of volatile organic compounds in the indoor air are realized, and purified clean air is directly discharged into a room through an air outlet of the main air pipe 1. In the period of ventilation and purification without starting the building, the fan in the main air duct is in a closed state, the indoor air does not enter the main air duct 1, the low-temperature plasma generator 3, the fan 4 and the stop valve 5 are started, as shown in fig. 2, the air flow driven by the fan 4 sequentially passes through the stop valve 5, the fan 4, the low-temperature plasma generator 3 and the adsorption/catalysis dual-function purification material component 2 which adsorbs volatile organic compounds under the low air speed (0.05-0.2 m/s), after circulating for 0.5-2 h, the low-temperature plasma generator 3 is closed, the bypass gas is continuously circulated for 0.1-0.2 h under the low air speed (0.05-0.2 m/s), and ozone which is not consumed completely catalytically decomposed into oxygen in the bypass gas by the adsorption/catalysis dual-function purification material component 2 and then is discharged into the indoor air through the air outlet of the main air duct 1.
Example 1
Outside a rectangular air pipe with the size of 320mm multiplied by 250mm of an air purifier in a certain office, a bypass is connected with a low-temperature plasma generator 3, a fan 4 and a stop valve 5 and is connected by a circular organic glass pipe or a stainless steel pipe with the inner diameter of 50 mm. The low-temperature plasma generator 3 is designed into a serial-tooth line-cylinder shape and adopts 8 cylinders which are connected in parallel. The serial tooth line is a discharge electrode, the cylinder is a grounding electrode, and an 8kV negative direct-current high-voltage power supply is applied between the serial tooth line and the cylinder. The serial-tooth line discharge electrode is a stainless steel rod with the inner diameter of 3mm and a plurality of discharge gears connected in series at equal intervals, 4 discharge tips are uniformly distributed on each gear, and the distance between the discharge gears is 10 mm; the grounding electrode is a cylindrical stainless steel tube, the inner diameter of the cylindrical stainless steel tube is 22mm, the thickness of the cylindrical stainless steel tube is 1mm, and the length of the cylindrical stainless steel tube is 300 mm. 1 percent of Ag to 5 percent of Mn/gamma-Al2O3The adsorption/catalysis double-function purification material is prepared into a honeycomb rectangular component 2 with the size of 300mm multiplied by 200mm multiplied by 50mm and is arranged in the air purifier, and the air volume is 500m during normal adsorption3H, benzene concentration in the treated air is 1.3mg/m3And closing the air purifier after adsorbing for 15 hours. The low-temperature plasma generator 3, the fan 4 and the stop valve 5 are opened in the bypass, the circulating gas passes through the adsorption/catalysis dual-function purification material component 2, the low-temperature plasma generated by the low-temperature plasma generator 3 carries out oxidative degradation on the organic matters adsorbed on the adsorption/catalysis dual-function purification material component 2, the regeneration of the adsorption performance of the adsorption/catalysis dual-function purification material component 2 is realized, the circulating air volume is 25m3And/h, the low-temperature plasma generator 3 is closed after discharging for 2 h. The circulating gas containing ozone is continuously circulated for 0.2h, and the complete decomposition of ozone is realized. The detection result shows that benzene is not detected at the air outlet of the air purifier after normal adsorption for 15 hours; bypass circulation after low-temperature plasma airflow circulation treatment for 2hOnly CO is detected in the ring gas stream2No CO and organic matter were detected, and the ozone concentration was 1.8mg/m3(ii) a After the discharge is stopped and the bypass airflow continues to circulate for 0.2h, no ozone is detected at the air outlet.
Example 2
The air purifier in an office is characterized in that a low-temperature plasma generator 3, a fan 4 and a stop valve 5 are connected by a bypass outside a rectangular air pipe with the size of 250mm multiplied by 250mm and are connected by a circular organic glass pipe or a stainless steel pipe with the inner diameter of 50 mm. The low-temperature plasma generator 3 is designed into a needle-hole plate type, a plurality of needle-shaped conductors are attached to a metal plate to serve as discharge electrodes, a stainless steel plate with holes serves as a grounding electrode, a conductive terminal is punched in an organic glass tube to be connected with the positive electrode and the negative electrode of a high-voltage power supply, and a 6kV positive polarity direct-current high-voltage power supply is applied between the conductive terminal and the positive electrode. The radius of the needle point is 0.5mm, the distance between the needles is 5mm, and the distance between the needle plates is 5 mm. Preparing a honeycomb rectangular component 2 which is 230mm multiplied by 200mm multiplied by 50mm from a 3 percent Ce-5 percent Mn/ZSM-5 adsorption/catalysis dual-function purification material, and installing the component in an air purifier, wherein the air volume is 490m during normal adsorption3The concentration of formaldehyde in the treated air is 1.0mg/m3And closing the air purifier after adsorbing for 15 hours. The low-temperature plasma generator 3, the fan 4 and the stop valve 5 are opened in the bypass, the circulating gas passes through the adsorption/catalysis double-function purification material component 2, the low-temperature plasma generated by the low-temperature plasma generator 3 carries out oxidative degradation on the organic matters adsorbed on the adsorption/catalysis double-function purification material component 2, the regeneration of the adsorption performance of the adsorption/catalysis double-function purification material component 2 is realized, the circulating air volume is 33m3And h, closing the low-temperature plasma generator 3 after discharging for 1.5 h. The circulating gas containing ozone is continuously circulated for 0.15h, so that the ozone is thoroughly decomposed. The detection result shows that the formaldehyde is not detected at the air outlet of the air purifier during normal adsorption; only CO is detected in the bypass circulating gas flow after the low-temperature plasma gas flow is circularly treated for 1.5h2No CO and organic matter were detected, and the ozone concentration was 8.5mg/m3(ii) a After the discharge is stopped, the bypass airflow continues to circulate for 0.15h, and no ozone is detected at the air outlet.
Example 3
In a student's classroomThe air purifier is characterized in that a low-temperature plasma generator 3, a fan 4 and a stop valve 5 are connected with a rectangular air pipe outer bypass with the size of 320mm multiplied by 200mm and connected by a circular organic glass pipe or a stainless steel pipe with the inner diameter of 50 mm. The low-temperature plasma generator 3 is designed into a line-plate type, an organic glass rectangular tube is used as a reactor shell, a plurality of nichrome wires with the diameter of 0.5mm are used as discharge electrodes, a stainless steel plate is used as a grounding electrode, conductive terminals are punched in the organic glass tube and connected with the positive electrode and the negative electrode of a high-voltage power supply, and an 8kV negative polarity direct-current high-voltage power supply is applied between the conductive terminals and the positive electrode. 1 percent of Ag to 3 percent of Mn/ZSM-5 adsorption/catalysis double-function purification material is prepared into a honeycomb rectangular component 2 with the thickness of 290mm multiplied by 170mm multiplied by 50mm, the honeycomb rectangular component is arranged in an air purifier, and the air volume is 180m during normal adsorption3H, toluene concentration in the treated air was 1.5mg/m3And closing the air purifier after adsorbing for 15 hours. The low-temperature plasma generator 3, the fan 4 and the stop valve 5 are opened in the bypass, the circulating gas passes through the adsorption/catalysis dual-function purification material component 2, the low-temperature plasma generated by the low-temperature plasma generator 3 carries out oxidative degradation on the organic matters adsorbed on the adsorption/catalysis dual-function purification material component 2, the regeneration of the adsorption performance of the adsorption/catalysis dual-function purification material component 2 is realized, the circulating air volume is 9m3And/h, closing the low-temperature plasma generator 3 after discharging for 1 h. The circulating gas containing ozone is continuously circulated for 0.1h, so that the ozone is thoroughly decomposed. The detection result shows that toluene is not detected at the air outlet of the air purifier during normal adsorption; only CO is detected in the bypass circulating gas flow after the low-temperature plasma gas flow is circularly treated for 1h2No CO and organic matter were detected, and the ozone concentration was 4.3mg/m3(ii) a After the discharge is stopped and the bypass airflow continues to circulate for 0.1h, no ozone is detected at the air outlet.
Claims (1)
1. A device for purifying indoor volatile organic compounds by low-temperature plasma concerted catalysis with high efficiency, low energy consumption and no secondary pollution comprises a main air pipe (1) and an adsorption/catalysis dual-function purification material component (2), wherein one end of the main air pipe (1) is an air inlet, the other end of the main air pipe (1) is an air outlet, indoor air to be purified enters the main air pipe (1) from the air inlet, the indoor air to be purified passes through the adsorption/catalysis dual-function purification material component (2) in the main air pipe (1) to perform gas-phase adsorption separation on low-concentration volatile organic compounds in the indoor air, and clean air is discharged from the air outlet of the main air pipe (1) and returns to the indoor again;
the device also comprises a bypass, wherein the bypass comprises a fan (4), a stop valve (5) and a bypass air pipe (6);
the method is characterized in that:
the bypass also comprises a low-temperature plasma generator (3);
the low-temperature plasma generator (3), the fan (4) and the stop valve (5) are sequentially connected through a bypass air pipe (6);
circulating air flow on the bypass air pipe (6) sequentially passes through the low-temperature plasma generator (3), the adsorption/catalysis dual-function purification material component (2), the stop valve (5) and the fan (4), wherein an air outlet of the low-temperature plasma generator (3) is as close to the adsorption/catalysis dual-function purification material component (2) as possible;
the low-temperature plasma generator (3) adopts a bypass arrangement mode, namely is not arranged in a main air duct of the main air duct (1); the wind speed of the main wind channel is 1-3 m/s;
the low-temperature plasma generator (3) is designed into a needle-hole plate type, a plurality of needle-shaped conductors are attached to a metal plate to serve as discharge electrodes, a stainless steel plate with holes serves as a grounding electrode, and a conductive terminal is punched in an organic glass tube and is connected with the positive electrode and the negative electrode of a high-voltage power supply; the radius of the needle point is 0.5mm, the distance between the needles is 5mm, and the distance between needle plates is 5 mm;
the adsorption/catalysis bifunctional purification material component (2) is honeycomb-shaped;
the adsorption/catalysis double-function purification material in the adsorption/catalysis double-function purification material component (2) is 1 percent of Ag to 5 percent of Mn/gamma-Al2O31% Ag-3% Mn/ZSM-5 or 3% Ce-5% Mn/ZSM-5 material;
after the organic matter is completely oxidized, the low-temperature plasma generator (3) is closed, discharging is stopped, the bypass gas continuously circulates through the adsorption/catalysis dual-function purification material component (2) at a low wind speed, the low wind speed is 0.05-0.2 m/s, the residual ozone is thoroughly decomposed, and secondary pollution caused by ozone released to indoor air is avoided.
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| CN110935299B (en) * | 2019-12-13 | 2022-03-15 | 河北工业大学 | Method and device for decomposing dioxin in incineration flue gas by coupling catalysis of low-temperature plasma |
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