JP4200667B2 - Plasma reactor and air purification device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a plasma reactor that generates a low-temperature plasma by streamer discharge and performs gas treatment such as air purification, and an air purification apparatus that uses this plasma reactor.
[0002]
[Prior art]
  Conventionally, plasma reactors using low-temperature plasma are, for example, air purifiers or gases that decompose or detoxify harmful components and odor components contained in air or exhaust gas by the action of active species generated by the plasma. Used in processing equipment. For example, in Japanese Patent Laid-Open Nos. 8-155249 and 9-869, a streamer discharge is generated between a needle-like discharge electrode and a planar counter electrode to generate plasma, and gas is supplied to the discharge field. An apparatus for introducing and performing gas treatment is disclosed.
[0003]
[Problems to be solved by the invention]
  However, in the above-described conventional apparatus, sufficient processing capability may not be obtained depending on the type of gas that is the fluid to be processed.
[0004]
  Streamer discharge is generally a discharge method that occurs in a columnar space between a discharge electrode and a counter electrode, and can generate low-temperature plasma in the columnar space. If the discharge region is enlarged, the generation region of the low-temperature plasma is enlarged. In this case, the apparatus becomes large.
[0005]
  From the above, it is desired to increase the processing capacity without increasing the size of the apparatus in the plasma reactor. The present invention has been made in view of such problems, and its object is to suppress an increase in size in a plasma reactor that generates a low-temperature plasma by a streamer discharge to process a fluid to be processed. However, a sufficient processing capacity for the fluid to be processed is obtained.
[0006]
[Means for Solving the Problems]
  According to the present invention, a catalyst, an adsorbent, and the like are used in combination with a low temperature plasma in a plasma reactor (20) for generating a low temperature plasma by a streamer discharge to process a fluid to be processed.
[0007]
  Specifically, the first solution provided by the present invention includes a first electrode (21) and a second electrode (22) which are spatially separated, and1st electrode which is a discharge electrode (twenty one) And the second electrode which is the counter electrode (twenty two)Power supply means (24) connected so as to apply a discharge voltage to the two electrodes, both electrodes (21, 22) are arranged in the flow space of the fluid to be treated, and streamer discharge is generated between both electrodes (21, 22). It is premised on a plasma reactor (20) configured to treat a fluid to be treated by generating it. And this plasma reactor (20)1st electrode (twenty one) And second electrode (twenty two) Is configured to allow ventilation, and the second electrode (twenty two) Is a planar electrode (twenty two) Composed ofA treatment member (23) having a catalyst and an adsorbent for treating the fluid to be treated, and the treatment member (23) is located between the electrodes (21, 22) or downstream thereofIn the above planar electrode (twenty two) Where the streamer discharge spreads in a flare shapeIt is characterized by being arranged in. In this configuration, the power source means (24) can be a high voltage power source such as a direct current, an alternating current, or a pulse. Further, even if the processing member (23) is disposed a little away from the discharge field (D) between the first electrode (21) and the second electrode (22), the position of the processing member (23) is within the range where the plasma acts. The effect of the processing member (23) can be obtained.
[0008]
  In the first solution means, when a discharge voltage is applied from the power supply means (24) to the first electrode (21) and the second electrode (22), streamer discharge is generated. The fluid to be treated is converted into plasma in the discharge field (D) of the streamer discharge, and fast electrons and ions generated by the plasma, various active species (for example, radicals such as hydroxy radicals, excited oxygen molecules, excited nitrogen). Excited molecules such as molecules, excited water molecules, etc.), and when subjected to the discharge field (D), they are also acted on by processing members including catalysts and adsorbents. For example, when the fluid to be treated is air containing components to be treated such as harmful substances and odorous substances, these components to be treated are decomposed by plasma to be made non-brominated or detoxified, and also treated by treatment members. Done.Also, the processing member is where the streamer discharge spreads. (twenty three) Therefore, the active species of streamer discharge is treated member (twenty three) Acts on a wide range. In addition, the planar electrode (twenty two) The opening (22a) Etc., and the fluid to be treated is made to be the first electrode by allowing ventilation in the direction perpendicular to the surface. (twenty one) And second electrode (twenty two) Discharge field during (D) The second electrode when flowing through (twenty two) Opening (22a) Etc., and reliably receives the action of plasma.
[0009]
  Further, the second solving means taken by the present invention is the plasma reactor (20) according to the first solving means,Processing member (twenty three) But both electrodes (21,22) BetweenIt is characterized by being arranged.
[0010]
  According to the second solving means, by specifying the arrangement of the processing member (23), the fluid to be processed is subjected to the action of plasma, and the position of the processing member (23) is surely secured.Pass through.
[0011]
  Further, the third solving means taken by the present invention is a catalyst material in which the processing member (23) promotes the processing of the fluid to be processed in the plasma reactor (20) according to the first or second solving means. It is characterized by having.
[0012]
  In this third solution, the treatment member (23) contains a catalyst substance, so that the fluid to be treated is also subjected to the action of the catalyst in addition to the action of the plasma in the discharge field (D). It will be. Therefore, the synergistic effect of the plasma and the catalyst promotes deodorization and detoxification of the fluid to be treated.
[0013]
  Further, the fourth solution provided by the present invention is that, in the plasma reactor according to the third solution, the catalyst material is Pt (platinum), Pd (palladium), Ni (nickel), Ir (iridium). , Rh (rhodium), Co (cobalt), Os (osmium), Ru (ruthenium), Fe (iron), Re (rhenium), Tc (technetium), Mn (manganese), Au (gold), Ag (silver) , Cu (copper), W (tungsten), Mo (molybdenum), and Cr (chromium). Of these, some materials such as Fe and Mn are oxides (eg Fe₂O₃, MnO₂ Etc.).
[0014]
  The catalyst material specified in the fourth solution means that various active species (ozone, hydroxy radical, excited oxygen molecule, excited nitrogen, etc.) generated by, for example, streamer discharge when processing the component to be processed contained in the fluid to be processed. Molecules, excited water molecules, etc.). For this reason, these active species are in a state of increased activity and act on the component to be treated. In addition, it acts to adsorb many active species on the surface of the catalyst in an active state. Therefore, since the chemical reaction at the time of processing a to-be-processed fluid is accelerated | stimulated by these effect | actions, when a to-be-processed fluid is the air containing a harmful | toxic component or an odorous component, for example, debromination or detoxification is accelerated | stimulated.
[0015]
  The fifth solution provided by the present invention is that, in the plasma reactor (20) according to the third solution, the catalyst material is a manganese-based catalyst (Mn or Mn oxide (MnO₂ Or Mn₂O₃Etc.))) is contained in an amount of 10 to 60% by mass, and the sixth solution provided by the present invention is the plasma reactor (20) according to the fifth solution, wherein the catalytic substance is It is characterized by containing 30 to 40% by mass of a manganese-based catalyst.
[0016]
  In the fifth and sixth solutions, Mn, MnO₂ Or Mn₂O₃Therefore, the processing performance of the plasma reactor (20) is optimized. Conversely, Mn, MnO in the catalyst material₂ Or Mn₂O₃If the content is too small, the ability to treat harmful substances and the like becomes insufficient, while if the content is too large, the specific surface area of the catalyst becomes smaller and the performance is lowered, while the optimum performance is obtained.
[0017]
  Further, according to a seventh solving means of the present invention, in the plasma reactor (20) according to any one of the first to sixth solving means, the processing member (23) is included in the fluid to be processed. It is characterized by containing an adsorbent that adsorbs the component to be treated.
[0018]
  Further, the eighth solution provided by the present invention is that, in the plasma reactor (20) according to the seventh solution, the adsorbent is porous ceramic, activated carbon, activated carbon fiber, zeolite (aluminosilicate), mordenite. And at least one of ferrierite and silicalite (silica gel).
[0019]
  In the seventh and eighth solving means, the component to be treated contained in the fluid to be treated is adsorbed by the adsorbent. And the processing effect | action by a plasma is performed with respect to the to-be-processed component adsorbed by the adsorbent in this way. In particular, when the treatment member (23) is provided with a catalyst and an adsorbent is also included, the adsorbed components are decomposed in the presence of the catalyst, so that the treatment performance is improved.
[0020]
  The ninth solving means taken by the present invention relates to an air purification apparatus using the plasma reactor (20) according to any one of the first to eighth solving means. The air purification device (1) includes a casing (10) in which the plasma reactor (20) is housed, and air to be treated is introduced into the casing (10) to form a first electrode (21). It is configured to treat odorous components or harmful components in the air to be treated by passing the discharge field (D) between the second electrodes (22) and the treatment member (23). Yes.
[0021]
  In the ninth solution, the odor component or harmful component in the air to be treated is treated with the low temperature plasma generated by the streamer discharge, and the decomposition action by the catalyst and the adsorption action by the adsorbent are also performed. Is purified.
[0022]
【The invention's effect】
  According to the first solution, the action of various active species (fast electrons, ions, radicals, other excited molecules, etc.) generated by generating low temperature plasma by streamer discharge and the action of the processing member (23) Since the fluid to be processed is processed by the above, the processing performance can be greatly improved as compared with the conventional one using only low temperature plasma. Further, by selecting the catalyst and adsorbent of the processing member (23) according to the component of the fluid to be processed, the processing capacity can be further enhanced. In addition, according to this solution, the processing capability can be increased, so that sufficient performance can be obtained without increasing the size of the apparatus.In addition, streamer discharge is a planar electrode (twenty two) Electrodes to spread in a flare toward (21,22) The processing member where the streamer discharge spreads (twenty three) Because the processing member (twenty three) Can be used in a wide range, and efficient processing can be performed. The fluid to be treated is a planar electrode (twenty two) Since the fluid to be processed is reliably subjected to the action of plasma, the processing can be ensured.
[0023]
  Further, according to the second solution means, the processing fluid is subjected to the action of plasma and reliably passes through the position of the processing member (23).it can.
[0024]
  Further, according to the third solution means, the processing member (23) includes a catalytic substance that promotes the processing of the fluid to be processed so that the fluid to be processed is subjected to the plasma processing action and the catalyst decomposition action. Therefore, the processing performance of the reactor (20) can be sufficiently enhanced.
[0025]
  Further, according to the fourth solution, various active species (ozone, hydroxy radical, excitation, etc.) generated by generating low temperature plasma by streamer discharge when processing the component to be processed contained in the fluid to be processed. Oxygen molecules, excited nitrogen molecules, excited water molecules, etc.) can be further excited with a catalyst to increase the activity or adsorbed in an active state on the catalyst to promote the chemical reaction, ensuring reliable processing performance. Enhanced.
[0026]
  Further, according to the fifth and sixth solving means, Mn, MnO₂ Or Mn₂O₃Since the content of the manganese-based catalyst such as is specified in the optimum range, the processing performance of the plasma reactor (20) can be further enhanced.
[0027]
  According to the seventh and eighth solving means, the component to be treated contained in the fluid to be treated is adsorbed to the adsorbent and the treatment action by the plasma is performed, so that the treatment performance can be improved. In particular, when the treatment member (23) is provided with a catalyst and an adsorbent is also included, the adsorbed components are decomposed in the presence of the catalyst, so that the treatment performance is further improved.
[0028]
  Further, according to the ninth solution means, the odor component or harmful component in the air to be treated can be reliably treated using the low temperature plasma generated by the streamer discharge and the catalyst or the adsorbent. Air can be purified efficiently.
[0029]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0030]
  This embodiment relates to an air purification device (1) that purifies air by treating odorous components or harmful components in air to be treated by oxidative decomposition or the like. FIG. 1 shows a schematic configuration of the air purification device (1).
[0031]
  As shown in the figure, this air purification device (1) has a configuration in which each functional component is housed in a casing (10). As the functional components, a dust collection filter (11), a centrifugal fan (12), and a plasma reactor are included. (20) is housed in the casing (10). In addition, what is shown by the code | symbol (13) in FIG. 1 is an ozone decomposition catalyst for decomposing | disassembling ozone generated by the discharge in a plasma reactor (20).
[0032]
  An air suction port (15) for sucking air into the casing (10) is formed on one side surface (the right side surface in the figure) of the casing (10), and an air blowing port for blowing out purified air on the upper surface. An outlet (16) is formed. The air inlet (15) is provided with a suction grill (15a), and the air outlet (16) is provided with an outlet grill (16a). Further, the dust collection filter (11) is disposed inside the suction grille (15a) at the air suction port (15) so as to collect dust contained in the suction air.
[0033]
  The air blower outlet (16) is formed on the edge of the upper surface of the casing (10) opposite to the air suction opening (15) (the edge on the left side in FIG. 1). The centrifugal fan (12) is provided in the casing (10) corresponding to the air outlet (16). A fan power source (12a) is connected to the centrifugal fan (12). In the above configuration, in the casing (10), the space between the air inlet (15) and the air outlet (16) serves as a circulation space for the air to be treated. When the centrifugal fan (12) is activated, the air to be treated is sucked into the casing (10) through the suction grille (15a) of the air suction port (15) and the dust collection filter (11). The air to be treated is blown out of the casing (10) from the blowout grill (16a) of the air blowout opening (16) after the treatment in the reactor (20) described in detail below.
[0034]
  FIG. 2 is a cross-sectional view showing a schematic configuration of the plasma reactor (20), and FIG. 3 is a perspective view. The plasma reactor (20) includes a discharge electrode (first electrode) (21) and a counter electrode (second electrode) (22) as discharge means for generating low temperature plasma, and these electrodes (21, 22). ), And a processing member (23) disposed close to the counter electrode (22). That is, the processing member (23) is disposed in the discharge field (D).
[0035]
  The processing member (23) is composed of a honeycomb-shaped substrate (23a) having a large number of small holes (23b) penetrating along the air flow direction, and a catalytic substance is supported on the surface thereof. Specifically, this processing member (23) has Mn, MnO as catalyst materials.₂ Or Mn₂O₃30 to 40% by mass of a manganese-based catalyst such as This content specifies a suitable range, but the catalyst material includes Mn, MnO.₂ Or Mn₂O₃What contains 10-60 mass% etc. may be used.
[0036]
  Further, the catalyst material of the processing member (23) is Pt, Pd, Ni, Ir, Rh, Co, Os, Ru, Fe, Re, Tc, Mn, Au, Ag, Cu, W, Mo, or Cr. It is good also as a thing containing at least 1 sort (s) of these. These catalytic substances promote chemical reactions when treating the air to be treated.
[0037]
  The treatment member (23) carries an adsorbent along with the catalyst substance on the surface of the substrate (23a). The adsorbent adsorbs components to be treated such as odorous substances and harmful substances contained in the air to be treated. For example, activated carbon or zeolite is used. As the adsorbent, porous ceramics, activated carbon fiber, mordenite, ferrierite, silicalite or the like may be used, and at least one of these may be used.
[0038]
  The discharge electrode (21) includes an electrode plate (21b) and a plurality of needle electrodes (21a) fixed so as to be substantially orthogonal to the electrode plate (21b). The electrode plate (21b) is made of a mesh material, punching metal, or the like, and has a large number of openings (21c) through which air passes in the direction perpendicular to the surface. Further, an electrode plate having a large number of openings (22a) through which air passes in a direction perpendicular to the surface, such as a mesh material or a punching metal, is also used for the counter electrode (22). The discharge electrode (21) is arranged so that the electrode plate (21b) is substantially parallel to the counter electrode (22) and the needle electrode (21a) is substantially perpendicular to the counter electrode (22).
[0039]
  Both electrodes (21, 22) are connected to a high voltage pulse power source (power source means) (24) so that streamer discharge is generated between the discharge electrode (21) and the counter electrode (22). Due to this streamer discharge, low temperature plasma is generated in the discharge field (D). Low-temperature plasma causes radicals such as fast electrons, ions, ozone, and hydroxy radicals as active species (factors that affect the components to be treated such as odorous substances and harmful substances contained in the air to be treated) and other excited molecules (excitation) Oxygen molecules, excited nitrogen molecules, excited water molecules, etc.) are generated.
[0040]
  In the present embodiment, the discharge region for each needle electrode (21c) is widened by using a pulse high voltage, and thus, even if the number of needle electrodes (21c) is relatively small, the plasma generation region is To be spread. Specifically, a steep pulse high voltage with a short pulse rise time of about 100 ns or less and a pulse width of about 1 μs or less is applied between both electrodes, and a relatively wide range spread in a flare shape is converted into plasma. I am doing so. As the reason why the streamer discharge is generated in a wide area when the pulse waveform is specified in this way,(1)Because the voltage application time is short, it is possible to instantaneously apply a high voltage that would lead to a spark in normal discharge,(2)Increasing the applied voltage makes it easier for discharge to occur in all locations,(3)There is little suppression of discharge due to the space charge effect because the voltage rise is steep.(Four)For example, uniform discharge is likely to occur due to the short rise time.
[0041]
  In this embodiment, a pulse high voltage power supply is used as the power supply, but a DC or AC high voltage power supply may be used as the power supply.
[0042]
      -Driving action-
  Next, the operation of the air purification device (1) will be described.
[0043]
  When the operation of the air purification device (1) is started and the centrifugal fan (12) is started, first, air to be treated is sucked from the air suction port (15), and dust contained in the air is collected by the dust collecting filter ( 11) Collected by During the operation of the device (1), streamer discharge occurs between the discharge electrode (21) and the counter electrode (22) of the plasma reactor (20), and the air from which dust has been removed by the dust collection filter (11) Passes through the discharge field (D) between the electrodes (21, 22).
[0044]
  When the air to be treated passes through the discharge field (D), it is turned into plasma by the action of streamer discharge, and low-temperature plasma is generated. The various active species generated by this discharge are excited to a higher degree by contacting with the catalyst of the processing member (23), and the activity is enhanced, and these react efficiently with harmful substances and odorous substances. The material is decomposed and removed. For this reason, harmful substances and odorous substances in the air are quickly decomposed by the synergistic effect of the plasma and the catalyst.
[0045]
  Specifically, for example, Mn and MnO contained in the catalyst₂ Or Mn₂O₃Such manganese-based catalysts decompose ozone generated by low-temperature plasma into oxygen and active oxygen, and active oxygen having higher reactivity than ozone reacts with harmful substances and odorous substances in the air to be treated. Similarly, when other catalyst materials described above are included, these catalyst materials further excite various active species of low-temperature plasma including active oxygen to increase the activity or leave the active species in an active state. Because it works to adsorb, harmful substances and odorous substances in the air are quickly decomposed by the synergistic effect of plasma and catalyst.
[0046]
  Furthermore, since the treatment member (23) also contains an adsorbent, harmful substances and odorous substances in the air to be treated are adsorbed on the adsorbent, and the active species of the low-temperature plasma reliably act on these components. , Promote the decomposition process. That is, a more stable process is performed by including the catalyst and the adsorbent in one process member (23).
[0047]
      -Effect of Embodiment 1-
  According to the first embodiment, since the fluid to be treated is treated by the action of various active species generated by generating low temperature plasma by streamer discharge and the action of the catalyst and the adsorbent, only the low temperature plasma is processed. Compared with the conventional plasma reactor (20) that uses, the processing performance can be greatly improved. Further, in the plasma reactor (20), since the treatment can be performed by selecting a catalyst according to the component of the fluid to be treated, it is easy to sufficiently increase the treatment capacity without increasing the size.
[0048]
  In addition, the processing member (23) is disposed in the vicinity of the counter electrode in the discharge field, so that the processing member (23) can be surely passed when the fluid to be processed is subjected to the action of plasma. Can be reliably increased.
[0049]
  Furthermore, in FIG. 4, the toluene decomposition efficiency by this reactor (20) is shown on the vertical axis, and₂ As shown in the graph, the MnO content is shown on the horizontal axis.₂ If the catalyst contains 10 to 60% by mass, a relatively high decomposition efficiency can be obtained.₂ If it is a catalyst containing 30-40 mass%, since extremely high decomposition efficiency can be obtained, the processing performance of a plasma reactor (20) can be improved more.
[0050]
Second Embodiment of the Invention
  In the first embodiment, by using a plasma reactor (20) in which a catalyst and an adsorbent are combined with low temperature plasma generated by streamer discharge, odorous components or harmful components in the air to be treated are treated by oxidative decomposition or the like. An air purification device (1) for purifying air is constructed, and this plasma reactor (20) is a nitrogen oxide purification device (2) for treating nitrogen oxide in a gas to be treated by reductive decomposition or the like. It can also be applied to. In this case, a catalyst suitable for the treatment of nitrogen oxide is selected from the elements described in the first embodiment.
[0051]
  FIG. 5 schematically shows a cross-sectional structure of the nitrogen oxide purification device (2). This nitrogen oxide purifying device (2) has a gas inlet (corresponding to the air inlet of Embodiment 1) (15) and a gas outlet (also corresponding to an air outlet) on a pair of side walls of the casing (10). ) (16). The dust collection filter (11) is disposed in the casing (10) along the gas inlet (15). The plasma reactor (20) has the same electrode (21, 22) structure as that of the first embodiment, and a catalytic substance and an adsorbent are supported between the discharge electrode (21) and the counter electrode (22). A honeycomb-shaped processing member (23) is disposed.
[0052]
  In this device (2), no fan is provided in the casing (10). In this apparatus (2), the casing (10) is aligned with the direction of the gas inlet (15) and the gas outlet (16) in the flow path of the gas to be processed containing nitrogen oxide as a component to be processed. By arranging, the gas to be processed passes through the discharge field (D).
[0053]
  In this nitrogen oxide purification device (2), a gas to be treated containing nitrogen oxide is introduced into the casing (10) from the gas inlet (15) and passes through the discharge field (D) due to the streamer discharge. Therefore, the gas to be treated is turned into plasma, and the active species contained in the gas are further excited when passing through the treatment member (23), thereby reducing the nitrogen oxides to nitrogen gas.
[0054]
  Also in the second embodiment, since the fluid to be treated is treated by combining the action of the plasma generated by the streamer discharge and the action of the catalyst and the adsorbent, various active species generated by the low temperature plasma are effective for the treatment. The chemical reaction can be dramatically accelerated. Therefore, since the processing capacity of the plasma reactor (20) can be increased, the capacity as the nitrogen oxide purification device (2) can be greatly increased, and an increase in size can be prevented.
[0055]
      -Modification of Embodiment 2-
  (Modification 1)
  Embodiment 2 is an example in which a plasma reactor (20) using low-temperature plasma by streamer discharge is applied to a nitrogen oxide purification device (2). This plasma reactor (20) is a combustion exhaust gas purification device. It can also be applied to (3). The combustion exhaust gas purification device (3) treats nitrogen oxides in the combustion exhaust gas by reductive decomposition or the like, and treats unburned fuel and hydrocarbon by oxidative decomposition or the like. In this case, a catalyst suitable for the treatment of nitrogen oxides and the treatment of unburned fuel and hydrocarbon is selected from the catalyst materials described in the first embodiment.
[0056]
  The configuration of the flue gas purification device (3) is shown in FIG. 5 together with the nitrogen oxide purification device (2). The configuration is the same and only the application target is different. For this reason, a detailed description of the configuration of the combustion exhaust gas purification device (3) is omitted, but in this device (3), the action of the plasma generated by the streamer discharge is combined with the action of the catalyst and the adsorbent. By processing the processing fluid, the active species generated by the low-temperature plasma are effectively used to promote the chemical reaction, so that the processing performance of the gas to be processed can be greatly improved. In addition, the size of the device (3) can be prevented.
[0057]
  (Modification 2)
  The plasma reactor (20) of the present invention is applicable not only to the air purification device (1), the nitrogen oxide purification device (2), and the combustion exhaust gas purification device (3) but also to the dioxin decomposition device (4). Can do. The dioxin decomposition apparatus (4) treats dioxin in combustion exhaust gas by oxidative decomposition or the like. In this case, a catalyst that is suitable for the treatment of dioxin from the catalyst materials described in the first embodiment is employed.
[0058]
  The dioxin decomposing apparatus (4) also has a configuration in which a processing member (23) containing a catalyst and an adsorbent is disposed between the electrodes (21, 22), like the nitrogen oxide purifying apparatus (2). Therefore, by treating the fluid to be treated by combining the streamer discharge with the catalyst and the adsorbent, the active species generated by the low-temperature plasma can be effectively used to promote the chemical reaction. Can be greatly increased.
[0059]
  (Modification 3)
  Further, the plasma reactor (20) of the present invention includes an air purification device (1), a nitrogen oxide purification device (2), a combustion exhaust gas purification device (3), and a dioxin decomposition device (4), as well as a chlorofluorocarbon gas decomposition device. It can also be applied to the device (5). The chlorofluorocarbon decomposition apparatus (5) decomposes the chlorofluorocarbon gas by passing the chlorofluorocarbon gas through the discharge field (D) and the processing member (23) between the first electrode (21) and the second electrode (22). is there. In this case, a catalyst suitable for the decomposition of the chlorofluorocarbon gas from the catalyst materials described in the first embodiment is used.
[0060]
  Similarly to the nitrogen oxide purification device (2) and the like, the CFC decomposition device (5) also has a configuration in which a treatment member (23) containing a catalyst and an adsorbent is disposed between the electrodes (21, 22). Therefore, by treating the fluid to be treated by combining the streamer discharge with the catalyst and the adsorbent, the active species generated by the low-temperature plasma can be effectively used to promote the chemical reaction. Can be greatly increased.
[0061]
Other Embodiments of the Invention
  The present invention may be configured as follows with respect to the above embodiment.
[0062]
  For example, in Embodiment 1 described above, the processing member (23) having the catalyst substance and the adsorbent is placed in the counter electrode (D) formed between the discharge electrode (21) and the counter electrode (22). 22), the processing member (23) may be arranged near the counter electrode (22) on the downstream side of the discharge field (D) as shown by the phantom line in FIG.Good.
[0063]
  Further, instead of the honeycomb-shaped processing member (23), a gas-filled container filled with catalyst particles or adsorbent particles is used as a discharge field (D) between the first electrode (21) and the second electrode (22). ) It may be placed inside or downstream. Even if it does in this way, the effect similar to the above can be acquired.
[0064]
  Furthermore, in the above embodiment, the action of the catalyst and the action of the adsorbent are performed by one processing member (23). For example, the processing member (23) is divided into two as shown in FIG. The first processing member acting as a catalyst and the second processing member acting as an adsorbent may be separately arranged, or only one of them may be arranged in the discharge field or downstream thereof (not shown). ) In the example of FIG. 6, the discharge electrode (21) is disposed on both sides of the counter electrode (22), and the honeycomb-shaped processing members (23, 23) are disposed on both sides of the counter electrode (22). However, in such a configuration, one of the treatment members (23) contains a catalyst and the other contains an adsorbent, or both treatment members (23) contain an adsorbent and a catalyst, respectively. be able to. In the example of FIG. 6, the processing members (23) are disposed on both sides of the counter electrode (22), but the first and second processing members (23, 23) are disposed upstream of the counter electrode (22). Both may be arranged.
[0065]
  Further, in each of the above embodiments, examples in which the plasma reactor (20) is applied to the air purification device (1), the nitrogen oxide purification device (2), the combustion exhaust gas purification device (3), and the like have been described. The plasma reactor (20) can also be applied to other devices that process fluids to be processed, such as air conditioners and garbage processing machines.is there.
[0066]
  Also, the electrode shape is such that the discharge electrode (21) is needle-shaped and the counter electrode (22) is planar.Not limited to planarA combination of electrodes, or another form of electrode such as a linear electrode may be combined with a planar electrode.
[Brief description of the drawings]
FIG. 1 is a structural diagram of an air purification apparatus including a plasma reactor according to Embodiment 1 of the present invention.
2 is a cross-sectional view schematically showing a configuration of a plasma reactor in the air purification device of FIG.
3 is a perspective view schematically showing a configuration of a plasma reactor in the air purification device of FIG. 1. FIG.
FIG. 4 is a graph showing the decomposition efficiency of the gas to be processed in the plasma reactor.
FIG. 5 is a diagram schematically showing a configuration of a nitrogen oxide purifying apparatus according to Embodiment 2.
FIG. 6 is a view showing a modified example of the arrangement of the processing members.
[Explanation of symbols]
(1) Air purification device
(2) Nitrogen oxide purification equipment
(3) Combustion exhaust gas purification device
(10) Casing
(11) Dust collection filter
(12) Centrifugal fan
(15) Air inlet (gas inlet)
(16) Air outlet (gas outlet)
(20) Plasma reactor
(21) Discharge electrode
(22) Counter electrode
(23) Processing member
(24) High voltage power supply

Claims (9)

Connected so as to apply a first electrode (21) and a second electrode which is spatially separated (22), a discharge voltage to the second electrode and the first electrode is a discharge electrode (21) is a counter electrode (22) Power supply means (24), both electrodes (21, 22) are arranged in the flow space of the fluid to be treated, and a streamer discharge is generated between the electrodes (21, 22) to treat the fluid to be treated. A plasma reactor configured to:
Together with the first electrode (21) and a second electrode (22) is configured to be ventilated, the second electrode (22) is constituted by a planar electrode (22),
A treatment member (23) for treating a fluid to be treated is provided,
The processing member (23) is disposed between the electrodes (21, 22) or in the vicinity of the planar electrode (22) on the downstream side thereof and at a position where the streamer discharge spreads in a flare shape. Plasma reactor. The plasma reactor according to claim 1, characterized in that the treatment member (23) is arranged between both electrodes (21, 22) .   The plasma reactor according to claim 1 or 2, characterized in that the processing member (23) has a catalyst material that promotes processing of the fluid to be processed.   The catalyst material contains at least one of Pt, Pd, Ni, Ir, Rh, Co, Os, Ru, Fe, Re, Tc, Mn, Au, Ag, Cu, W, Mo, and Cr. The plasma reactor according to claim 3.   The plasma reactor according to claim 3, wherein the catalyst material contains 10 to 60 mass% of a manganese-based catalyst.   6. The plasma reactor according to claim 5, wherein the catalyst material contains 30 to 40% by mass of a manganese-based catalyst.   The plasma reactor according to any one of claims 1 to 6, wherein the processing member (23) includes an adsorbent that adsorbs a component to be processed contained in the fluid to be processed.   The plasma reactor according to claim 7, wherein the adsorbent is at least one of porous ceramics, activated carbon, activated carbon fiber, zeolite, mordenite, ferrierite, and silicalite. A plasma reactor (20) according to any one of claims 1 to 8;
A casing (10) in which the plasma reactor (20) is housed,
By introducing the air to be treated into the casing (10) and passing the discharge field (D) and the treatment member (23) between the first electrode (21) and the second electrode (22), the treatment object is obtained. An air purification apparatus configured to process odorous components or harmful components in the air.

Images