WO2005001250A1 - プラズマ発生電極及びプラズマ反応器 - Google Patents
プラズマ発生電極及びプラズマ反応器 Download PDFInfo
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- WO2005001250A1 WO2005001250A1 PCT/JP2004/009014 JP2004009014W WO2005001250A1 WO 2005001250 A1 WO2005001250 A1 WO 2005001250A1 JP 2004009014 W JP2004009014 W JP 2004009014W WO 2005001250 A1 WO2005001250 A1 WO 2005001250A1
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- conductive film
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0892—Electric or magnetic treatment, e.g. dissociation of noxious components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/087—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy
- B01J19/088—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
- H05H1/2441—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes characterised by the physical-chemical properties of the dielectric, e.g. porous dielectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J2219/0803—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy
- B01J2219/0805—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges
- B01J2219/0807—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges involving electrodes
- B01J2219/0809—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges involving electrodes employing two or more electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J2219/0803—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy
- B01J2219/0805—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges
- B01J2219/0807—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy giving rise to electric discharges involving electrodes
- B01J2219/0824—Details relating to the shape of the electrodes
- B01J2219/0835—Details relating to the shape of the electrodes substantially flat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J2219/0873—Materials to be treated
- B01J2219/0875—Gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J2219/0894—Processes carried out in the presence of a plasma
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/24—Stationary reactors without moving elements inside
- B01J2219/2401—Reactors comprising multiple separate flow channels
- B01J2219/245—Plate-type reactors
- B01J2219/2451—Geometry of the reactor
- B01J2219/2453—Plates arranged in parallel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/24—Stationary reactors without moving elements inside
- B01J2219/2401—Reactors comprising multiple separate flow channels
- B01J2219/245—Plate-type reactors
- B01J2219/2476—Construction materials
- B01J2219/2483—Construction materials of the plates
- B01J2219/2487—Ceramics
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
- H05H1/2418—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes the electrodes being embedded in the dielectric
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
- H05H1/2437—Multilayer systems
Definitions
- the present invention relates to a plasma generation electrode and a plasma reactor. More specifically, the present invention relates to a plasma generating electrode and a plasma reactor capable of generating uniform and stable plasma and having excellent heat resistance.
- Silent discharge is generated by placing a dielectric between two electrodes and applying a high-voltage alternating current or periodic pulse voltage, and active species, radicals, and ions are generated in a plasma field generated by the discharge. It is known that it promotes the reaction and decomposition of gases, which can be used to remove harmful components contained in engine exhaust gas and various incinerator exhaust gases.
- the present invention has been made in view of the above-mentioned problems, and has high uniformity and low productivity.
- a plasma generating electrode and a plasma reactor which can generate a constant plasma and have excellent heat resistance.
- the present invention provides the following plasma generating electrode and plasma reactor.
- a plasma generating electrode which has at least a pair of unit electrodes arranged at predetermined intervals and is capable of generating a plasma by applying a voltage between these unit electrodes.
- Each of the pair of unit electrodes is formed of a plate-shaped ceramic body serving as a dielectric and a conductive film disposed inside the ceramic body, and is disposed on one surface of each of the unit electrodes in a predetermined pattern.
- the pair of unit electrodes (upper unit electrode and lower unit electrode) are formed in a state where a plurality of spaces having both ends opened in the direction in which the ridges are formed are formed by the front surface and the back surface of the other unit electrode (upper unit electrode).
- Side unit electrode) t Thickness of the ridge Are stacked hierarchically with an interval corresponding to the following, and constitute one basic unit. Further, a plurality of the basic units are stacked in a hierarchical manner and correspond to the thickness of the ridge.
- the unit electrodes are three-dimensionally arranged.
- a plasma generation electrode capable of generating plasma in the space.
- the outer shape of the protrusion is substantially the same as the basic unit electrode, the thickness is the same as the protrusion, and one side parallel to the direction in which the protrusion is disposed is equal to or longer than the length of the protrusion.
- the basic unit is moved upward from an area other than the area where the ridges are provided on the upper surface.
- the first conductive through-hole and the second conductive through-hole which penetrate in the vertical direction while being in contact with at least a part of at least a part of the conductive film disposed on the side unit electrode and the lower unit electrode, respectively.
- the plasma generating electrode according to the above [1] or [2], which is electrically conductive.
- a conductive film (the first conductive film having a through-hole and the second conductive film provided on the inner wall of each of the first through-hole for conduction and the second through-hole for conduction)
- the conductive films provided on the upper unit electrode and the lower unit electrode constituting the basic unit may be provided at both ends of the basic unit in a direction perpendicular to a direction in which the protrusions are provided. Parts, and the basic unit has conductive films (first and second end surface conductive films) disposed on end surfaces on respective sides of the both end portions. The first end conductive film and the second end conductive film are brought into contact with the conductive films disposed on the upper unit electrode and the lower unit electrode, respectively, thereby forming the basic unit.
- the plasma generating electrode according to [1] or [2], wherein electrical conduction from the upper surface to the lower surface is enabled.
- the distance between the adjacent ridges is not less than 0.2 times and not more than 20 times the interval corresponding to the thickness of the ridges.
- a plasma generating electrode according to [10] A plasma generation electrode according to any one of [1] to [9], wherein the plasma generation electrode is three-dimensionally arranged between a plurality of the unit electrodes constituting the plasma generation electrode (electrode unit).
- a plasma reactor capable of reacting the predetermined component in the gas with the plasma generated in the space when a gas containing the predetermined component is introduced into the arranged space.
- each of the pair of unit electrodes includes a plate-shaped ceramic body serving as a dielectric and the ceramic body. Since it is formed from the conductive film disposed inside the substrate, uniform and stable plasma can be generated.
- a plurality of basic units composed of a pair of unit electrodes are layered in a hierarchical manner to form an electrode unit, which is used as a plasma generating electrode, even if thermal stress is generated, the basic unit is not connected between the basic units. Distortion can be reduced, and a plasma generating electrode with excellent heat resistance can be obtained.
- the ridges are arranged between the unit electrodes in a predetermined pattern, the slackness and the like are reduced by supporting the unit electrodes by the ridges, and the unit electrodes are maintained in a planar shape by maintaining the planar shape of the unit electrodes. The distance between them is constant (over the entire surface), and the plasma becomes uniform. Furthermore, since the ridges are provided between the unit electrodes, the creeping discharge generated at the portion where the ridges and the unit electrodes come into contact (the corners of the ridges) reduces the space formed between the ridges. Spreading and low energy injection make it possible to transition to a uniform barrier discharge between each unit electrode.
- the plasma generating electrode of the present embodiment can be manufactured by previously manufacturing a basic unit and laminating the basic unit, so that assembling of parts does not become complicated and productivity can be improved.
- the plasma reactor of the present invention since a plasma reactor having such a plasma generating electrode is used, it is possible to generate uniform and stable plasma with excellent productivity, Excellent heat resistance can be obtained.
- FIG. 1 (a) schematically shows a basic unit constituting one embodiment of the plasma generating electrode of the present invention, and shows a direction in which ridges are arranged.
- FIG. 2 is a cross-sectional view taken along a plane perpendicular to FIG.
- FIG. 1 (b) is a perspective view of the basic unit shown in FIG. 1 (a).
- FIG. 2 (a) schematically shows a unit electrode constituting one embodiment of the plasma generating electrode of the present invention, and shows a plane perpendicular to the arrangement direction of the ridges. It is sectional drawing cut
- FIG. 2 (b) is a perspective view of the unit electrode shown in FIG. 2 (a).
- FIG. 2 (c) is a plan view showing a conductive film constituting the unit electrode shown in FIG. 2 (a).
- FIG. 3 is a perspective view schematically showing a plasma generating electrode of the present invention.
- FIG. 4 schematically shows a basic unit constituting one embodiment of the plasma generating electrode of the present invention, and is a cross-sectional view cut along a plane perpendicular to the direction in which the ridges are arranged. is there
- FIG. 5 (a) schematically shows a basic unit constituting one embodiment of the plasma generating electrode of the present invention, in which the basic unit is parallel to the unit electrode. It is a side view seen from the direction perpendicular to the ridge.
- FIG. 5 (b) is a sectional view taken along line AA ′ of FIG. 5 (a).
- FIG. 6 is a cross-sectional view of the plasma generating electrode of the present embodiment cut along a plane perpendicular to the direction in which the ridges are provided.
- FIG. 7 is a perspective view schematically showing a process for manufacturing one embodiment of the plasma generating electrode of the present invention.
- FIG. 8 is a perspective view schematically showing a ridge-arranged ceramic body constituting one embodiment of the plasma generating electrode of the present invention.
- FIG. 9 is a perspective view schematically showing a ceramic body provided with a conductive film, which constitutes one embodiment of the plasma generating electrode of the present invention.
- FIG. 10 (a) schematically shows one embodiment of the plasma reactor of the present invention, and is a plane perpendicular to the unit electrode including the direction in which the fluid to be processed passes.
- FIG. 10 (a) schematically shows one embodiment of the plasma reactor of the present invention, and is a plane perpendicular to the unit electrode including the direction in which the fluid to be processed passes.
- FIG. 10 (b) is a sectional view taken along a line ⁇ _ ⁇ ′ of FIG. 10 (a).
- FIG. 1 (a) and FIG. 1 (b) schematically show a basic unit constituting one embodiment of the plasma generating electrode of the present invention.
- FIG. 1B is a cross-sectional view taken along a plane perpendicular to the direction in which the ridges are provided, and FIG. 1B is a perspective view.
- FIGS. 2 (a), 2 (b), and 2 (c) schematically show a unit electrode constituting one embodiment of the plasma generating electrode of the present invention. Is a cross-sectional view taken along a plane perpendicular to the direction in which the ridges are arranged, FIG. 2 (b) is a perspective view, and FIG. 2 (c) is a plan view showing a conductive film constituting a unit electrode. is there.
- FIG. 3 is a perspective view schematically showing the plasma generating electrode of the present invention.
- the plasma generation electrode 100 of the present embodiment has a basic unit 1 (FIG. 1) composed of a pair of unit electrodes 2 (see FIGS. 2 (a) and 2 (b)). (a) and Fig. 1 (b)) are hierarchically stacked in three layers. As a result, the plasma generating electrode 100 has three pairs of unit electrodes 2 (see FIGS. 2 (a) and 2 (b)) spaced at a predetermined interval (an interval corresponding to the thickness of the ridge 13). By applying a voltage between these unit electrodes 2 (see FIGS. 2 (a) and 2 (b)), plasma can be generated.
- FIGS. 2 (a) and 2 (b) By applying a voltage between these unit electrodes 2 (see FIGS. 2 (a) and 2 (b)), plasma can be generated.
- a basic unit 1 constituting the plasma generating electrode 100 shown in FIG. 3 includes a pair of unit electrodes 2 (an upper unit electrode 2a and a lower unit electrode 2a). 2b) is hierarchically stacked at an interval corresponding to the thickness of the ridge 13.
- each of the pair of unit electrodes 2 has a plate-shaped ceramic body 19 serving as a dielectric and a conductive body disposed inside the ceramic body 19.
- a plurality of ridges 13 of a predetermined thickness (thickness of ridges) H arranged in a predetermined pattern on each one surface (one surface of the unit electrode) 3 are formed from the film 12. .
- the “predetermined pattern” refers to a state in which the ridges 13 are arranged at substantially equal intervals and substantially parallel to each other. Then, as shown in FIGS. 1 (a) and 1 (b), one surface (one surface of the unit electrode) of one unit electrode (lower unit electrode) 2b of the pair of unit electrodes 2 3 and the surface of the ridge 13 (the front surface of the ridge) 14 and the back surface of the other unit electrode (upper unit electrode) 2a (the back surface of the unit electrode) 4 Arrangement direction (projection line arrangement direction) With a plurality of spaces V open at both ends of D, a pair of unit electrodes (upper unit electrode 2a and lower unit electrode 2a) are formed.
- the ridge 13 serves as a wall that partitions a space formed between the upper unit electrode 2a and the lower unit electrode 2b into a plurality of spaces V, and the ridge 13 further forms the upper unit electrode 2a and the lower unit electrode 2a.
- the unit electrodes 2b are supported, so that each unit electrode is hardly deformed.
- the plasma generating electrode 100 of the present embodiment includes a plurality (three in FIG. 3) of the basic units 1 that are hierarchically stacked, and the thickness H
- the electrode unit 5 is composed of an electrode unit 5 in which the unit electrodes 2 and the space V are arranged three-dimensionally, and a voltage is applied between the unit electrodes 2 constituting the electrode unit 5 to form a three-dimensional arrangement. Plasma can be generated in the space V.
- each of the pair of unit electrodes (the upper unit electrode and the lower unit electrode) is formed of a plate-shaped ceramic body serving as a dielectric and a conductive film provided inside the ceramic body. Therefore, a plasma generating electrode capable of generating uniform and stable plasma is obtained.
- a plurality of basic units composed of a pair of unit electrodes are layered in a hierarchical manner to form an electrode unit, which is used as a plasma generating electrode, even if thermal stress occurs, distortion occurs between the basic units. It is a plasma generating electrode that can be relaxed and has excellent heat resistance.
- each unit electrode is supported by the ridges to reduce deformation such as slack, and each plate-like unit electrode is placed on its flat surface.
- the distance between adjacent unit electrodes becomes substantially constant over the entire surface, and the plasma becomes more uniform.
- the ridge plays the role of a support pillar that supports each unit electrode.
- ridges are provided between each unit electrode, creeping discharge that occurs near the surface of the unit electrode generated at the corner of the ridge expands the space formed between the ridges, resulting in low energy injection.
- the plasma generation electrode of the present embodiment can be manufactured by previously manufacturing a basic unit and laminating the basic units, so that assembling of parts does not become complicated and productivity can be improved. .
- the thickness of the conductive film 12 constituting the unit electrode 2 shown in FIG. In order to reduce the size and reduce the resistance of the fluid to be treated passing between the pair of unit electrodes 2 when treating exhaust gas, etc., the thickness is preferably 0.001 to 0.1 mm. It is preferable that the distance is 0.01 mm to 0.05 mm.
- the conductive film 12 used in the present embodiment preferably contains a metal having excellent conductivity as a main component.
- the main component of the conductive film 12 is tungsten or molybdenum.
- Preferred examples include at least one metal selected from the group consisting of manganese, chromium, titanium, zirconium, nickel, iron, silver, copper, platinum, and palladium.
- the main component means a component that accounts for 60% by mass or more of the component.
- the conductive film 12 contains two or more kinds of metals from the above-mentioned groups as main components, the sum of these metals should account for 60% by mass or more of the components.
- the conductive film 12 is preferably applied and disposed on a tape-shaped ceramic molded body 11. Suitable examples include, for example, screen printing, calendar roll, spray, electrostatic coating, dip, knife coater, chemical vapor deposition, physical vapor deposition and the like. According to such a method, it is possible to easily form the thin conductive film 12 having excellent surface smoothness after coating.
- the metal powder mentioned as a main component of the conductive film 12, an organic binder, and a solvent such as terbineol are mixed. It can be formed by forming a conductive paste and applying it to the tape-shaped ceramic molded body 11 by the method described above. Further, an additive may be added to the above-described conductor paste as needed to improve the adhesiveness and sinterability with the tape-shaped ceramic molded body 11.
- the ceramic body 19 By adding the same component as the ceramic body 19 to the metal component of the conductive film 12, it is possible to improve the adhesion between the conductive film 12 and the ceramic body 19. Further, a glass component can be added to the ceramic component added to the metal component. By adding the glass component, the sinterability of the conductive film 12 is improved, and the denseness is improved in addition to the adhesion.
- the sum of the components of the ceramic body 19 other than the metal components and the Z or glass components is preferably 30% by mass or less. If it exceeds 30% by mass, the resistance value may decrease, and the function as the conductive film 12 may not be obtained.
- the plate-shaped ceramic body 19 (tape-shaped ceramic molded body 11) constituting the unit electrode 2 has a function as a dielectric as described above, and the conductive film 12 has a plate-like shape.
- biased discharge such as sparks is reduced and small discharges are generated at a plurality of locations, compared to the case where the conductive film 12 is used alone for discharge. Can be created.
- Such a plurality of small discharges can reduce power consumption because a smaller amount of current flows than a discharge such as a spark, and furthermore, a current flowing between the unit electrodes 2 due to the presence of the dielectric. Therefore, non-thermal plasma with low energy consumption without temperature rise can be generated.
- At least one of the unit electrodes 2 constituting the basic unit 1 has a plate-like ceramic body 19 serving as a dielectric, and FIG. 2 (c) disposed inside the plate-like ceramic body 19. And a conductive film 12 in which a plurality of conductive film through holes 12a having a cross section cut in a plane perpendicular to the film thickness direction and partially including an arc are formed.
- the cross-sectional shape of the conductive film through-hole 12a may not include an arc.
- the size of the conductive film through-holes 12a described above is not particularly limited.
- the diameter of each conductive film through-hole 12a is preferably 0.5 to 10 mm.
- the electric field concentration on the outer periphery of the conductive film through-hole 12a becomes a suitable condition for the discharge, and the discharge can be favorably performed even if the voltage applied between the pair of unit electrodes 2 is not so high. You can get started. If the diameter of the conductive film through hole 12a is less than 0.5 mm, the size of the conductive film through hole 12a becomes too small, and the discharge generated on the outer periphery of the conductive film through hole 12a starts at the above-described point.
- the state may be similar to that of a localized discharge, and a non-uniform plasma may be generated. Further, when the diameter of the conductive film through hole 12a exceeds 10 mm, discharge is unlikely to occur inside the conductive film through hole 12a, so that the density of plasma generated between the pair of unit electrodes 2 may be reduced.
- the conductive film through-holes 12a be arranged regularly.
- the distance between the centers of the P-contacts is determined according to the diameter of the conductive film through-hole 12a. Appropriately determine the length so that uniform and high-density plasma can be generated.
- the distance be defined, but it is not particularly limited, but it is preferable that the distance between the centers of adjacent ones is 11 to 20 mm.
- the conductive film through-hole 12a is formed such that the outer peripheral length of the conductive film through-hole 12a per unit area becomes long.
- the length of the region where the electric field is non-uniform per unit area that is, the length of the outer periphery serving as the starting point of plasma generation can be increased, and many discharges occur per unit area.
- the specific length (mmZ (mm) 2 ) of the outer periphery of the conductive film through-hole 12a per unit area can be appropriately set depending on the intensity of the generated plasma and the like. In this case, it is preferable that the ratio is 0.05-1.7 mm / (mm) 2 .
- the length of the outer periphery of the conductive film through-hole 12a per unit area is smaller than 0.05, local discharge occurs, and a stable discharge space may be obtained. If it is larger than 1.7, the resistance value of the conductive film may increase and the discharge efficiency may decrease.
- the area per unit area of the conductive film having the conductive film through-holes 12a is 0.1-0.98 (mm) 2 / (mm) 2 . preferable. If it is less than 0.1, the capacitance of the dielectric electrode is too small, and it is difficult to obtain the discharge required for exhaust gas purification. If it is larger than 0.98, a uniform discharge effect due to the conductive film through hole is obtained, and local discharge may easily occur.
- the plate-shaped ceramic body 19 (tape-shaped ceramic molded body 11) preferably includes a material having a high dielectric constant as a main component.
- a material having a high dielectric constant for example, aluminum oxide, zirconium oxide, silicon oxide, cordierite, mullite, Titanium-barium oxides, magnesium-calcium-titanium oxides, barium-titanium-zinc oxides, silicon nitride, aluminum nitride, and the like can be preferably used.
- a material with excellent thermal shock resistance as the main component, it becomes possible to operate the plasma generating electrode even under high temperature conditions.
- LT low-temperature fired substrate material obtained by adding a glass component to aluminum oxide (Al 2 O 3)
- Copper metallization can be used as conductor for CC). Since copper metallization is used, an electrode having a low resistance and a high discharge efficiency is manufactured, and the size of the electrode can be reduced. And the design which avoided the thermal stress is attained, and the problem of low strength is solved. Barium titanate, magnesium-calcium-titanium oxide, barium-titanium-zinc oxide When an electrode is made of a material with a high dielectric constant, such as an object, the size of the electrode can be reduced because of the high discharge efficiency, and a structure design that can reduce the occurrence of thermal stress due to high thermal expansion is possible. .
- the thickness of the tape-shaped ceramic molded body 11 when the plate-shaped ceramic body 19 is formed of the tape-shaped ceramic molded body 11 is not particularly limited, but is not limited to 0.1. Les, which is preferably one 3 mm. If the thickness force of the tape-shaped ceramic molded body 11 is less than 0.1 mm, electrical insulation between a pair of adjacent unit electrodes 2 may not be secured. Further, when the thickness of the tape-shaped ceramic molded body 11 exceeds 3 mm, the thickness exceeds the thickness required as a dielectric and may hinder space saving.
- a ceramic green sheet for a ceramic substrate can be suitably used as the tape-shaped ceramic molded body 11.
- the ceramic green sheet is formed by shaping a slurry or paste for producing a green sheet into a predetermined thickness according to a conventionally known method such as a doctor blade method, a calendar method, a printing method, a reverse roll coater method, or the like. Can be formed.
- the ceramic green sheets formed in this manner are subjected to processing such as cutting, cutting, punching, forming of communication holes, etc., or are integrally laminated by heat bonding in a state where a plurality of green sheets are laminated. It may be used as an object.
- the slurry or paste for producing the green sheet described above is preferably prepared by mixing a predetermined ceramic powder with an appropriate binder, a sintering aid, a plasticizer, a dispersant, an organic solvent, and the like.
- a predetermined ceramic powder powders of alumina, mullite, cordierite, silicon nitride, aluminum nitride, ceramic glass, glass and the like can be mentioned as preferred examples.
- silicon oxide, magnesium oxide, calcium oxide, titanium oxide, zirconium oxide, and the like can be mentioned as preferred examples of the sintering aid.
- the sintering aid is preferably added in an amount of 3 to 10 parts by mass based on 100 parts by mass of the ceramic powder.
- the plasticizer, dispersant and organic solvent conventionally used plasticizers, dispersants and organic solvents can be suitably used.
- the porosity of the plate-shaped ceramic body 19 is preferably 0.1 to 3%, more preferably 0.1 to 10%. .
- This configuration As a result, it is possible to efficiently generate plasma between the upper unit electrode 2a and the lower unit electrode 2b having the plate-shaped ceramic body 19 (tape-shaped ceramic molded body 11), thereby saving energy. Can be realized.
- the unit electrode 2 has the conductive film 12 provided on the surface of the tape-shaped ceramic molded body 11, and the conductive film 12 is further placed on the conductive film 12 with two tape-shaped ceramic molded bodies 11. It is preferably formed by disposing a tape-shaped ceramic molded body 11 so as to sandwich it.
- the ridge 13 provided on one surface of the unit electrode 2 is made of the same material as the plate-shaped ceramic body 19.
- the thickness H of the ridges is preferably 0.1 to 3 mm, and the distance L between adjacent ridges 13 is preferably 1 to 50 mm.
- the ridge 13 and the unit electrode 2 are made of a material having the same dielectric constant and the basic units 1 are stacked and fired integrally, the energy efficiency is improved.
- the width W of the ridge 13 is preferably 0.1 to 5 mm. Thereby, uniform plasma can be generated more efficiently in the space V, and when exhaust gas or the like flows into the space V, it can be caused to flow with low resistance.
- the basic unit 1 in order to conduct electricity to the basic unit 1, the basic unit 1 is provided with ridges on its upper surface (the upper surface of the basic unit) 6. Area other than area A (area other than the area where the ridges are provided) B penetrates the conductive film 12 provided on the upper unit electrode 2a and the lower unit electrode 2b from B and contacts the conductive film 12 in the vertical direction A first through-hole 15 for conduction and a second through-hole 16 for conduction (hereinafter, may be simply referred to as “through-holes 15 and 16 for conduction”) penetrating through the inside.
- the first through-holes 15 for conduction and the second through-holes 16 for conduction are for ensuring conduction between the conductive films 12 of the respective unit electrodes 2 constituting the basic unit 1, and It is a through hole penetrating at least the ceramic body 19 covering the membrane 12.
- the conductive through holes 15 and 16 may be through holes passing through the conductive film 12 together with the ceramic body 19 as long as they are in contact with the conductive film 12. It may not be penetrated.
- the conduction through holes 15 and 16 are formed through the conductive film 12 together with the ceramic body 19. It is preferably a hole.
- the basic unit 1 includes a conductive film (the first through-hole conductive film 17 and the second through-hole) provided on the inner wall of each of the first through-hole 15 for conduction and the second through-hole 16 for conduction.
- the first through-hole conductive film 17 and the second through-hole conductive film 18 are in contact with the conductive films 12 disposed on the upper unit electrode 2a and the lower unit electrode 2b, respectively. By doing so, it is preferable to enable electrical conduction from the upper surface 6 of the basic unit to the lower surface 7 of the basic unit. It is preferable that the material, thickness, and the like of the first through-hole conductive film 17 and the second through-hole conductive film 18 are the same as those of the above-described conductive film 12.
- the protective film strength is at least one type of metal film selected from the group consisting of nickel boron, nickel phosphorus, cobalt boron, cobalt phosphorus, chromium, iron, silver, silver-palladium, platinum, and gold. Is preferred.
- a method for forming a dense metal film can be selected from electrolytic plating, electroless plating, chemical vapor deposition, physical vapor deposition, melting plating, thermal spraying, and the like.
- the conductive film 12 provided on each of the upper unit electrode 2a and the lower unit electrode 2b constituting the basic unit 1 is provided with the conductive film 12 of the basic unit 1 on which the ridge 13 is provided.
- the direction perpendicular to the installation direction (the direction perpendicular to the ridge on the unit electrode 2) is extended to both ends of P, respectively, and the basic unit 1 is attached to the end face on each side of both ends.
- the first end surface conductive film 21 and the second end surface conductive film 22 and the upper unit electrode 2a The electrical conduction from the upper surface 6 of the basic unit to the lower surface 7 of the basic unit may be enabled by making contact with the conductive film 12 disposed on the lower unit electrode 2b.
- FIG. 4 schematically shows a basic unit constituting one embodiment of the plasma generating electrode of the present invention, and is a cross-sectional view taken along a plane perpendicular to the arrangement direction of the ridges. .
- the material, thickness, and the like of the first end surface conductive film 21 and the second end surface conductive film 22 are the same as those of the conductive film 12 described above. Further, it is preferable to provide a protective film on the surfaces of the conductive films 21 and 22.
- the upper unit electrode 2a extends to one end in the P direction, and the unit electrode 2a
- the lower unit electrode 2b is connected to the second one-side end conductive film 24 disposed so as to extend in a band shape in the vertical direction with respect to the unit electrode 2b at the one end of the basic unit 1 on the one side end. May be connected to the first one-side end surface conductive film 23 disposed so as to extend vertically in a strip shape, and the energization mechanism may be formed only at one end of the basic unit 1. . As shown in FIG.
- the conductive film 12 of the upper unit electrode 2a is connected to the second one-side end surface conductive film 24, not connected to the first one-side end surface conductive film 23
- the conductive film 12 of the electrode 2b is connected to the first one-side end conductive film 23 and is not connected to the second one-side end conductive film 24.
- the first one-side end surface conductive film 23 and the second one-side end surface conductive film 24 both extend to both ends in the direction perpendicular to the unit electrode 2 of the basic unit 1 and are adjacent when the basic units 1 are stacked. It is preferable that each of the basic units 1 is connected to the first one-side end surface conductive film 23 and the second one-side end surface conductive film 24 to be conductive.
- FIG. 5 schematically shows a basic unit constituting one embodiment of the plasma generating electrode of the present invention
- FIG. 5 (a) shows the basic unit 1 with respect to the unit electrode 2.
- FIG. 5 (b) is a cross-sectional view taken along the line AA ′ of FIG. 5 (a).
- the opening ratio shown below is more preferably 20% or more, more preferably 50% or more. If the opening ratio is less than 20%, when used in the exhaust gas system of an engine, the back pressure will increase, which may affect the engine performance.
- the ratio of the opening refers to a part corresponding to the space V corresponding to the gas flow in the cross-section when the plasma generating electrode is cut along a plane perpendicular to the arranging direction of the protrusion. Is the ratio of "total area”.
- the “entire space” refers to the entire region where the space V is formed in the cross section of the plasma generating electrode 100 shown in FIG. 6, and the region is defined by the upper end of the plasma generating electrode 100 in the height direction.
- FIG. 6 shows the plasma generating electrode 100 of the present embodiment dropped in the direction in which the ridges are provided. It is sectional drawing at the time of cutting by a straight plane.
- the thickness t of the unit electrode 2 shown in FIG. 6 is 0.1 times 1-5 of the interval between the unit electrodes 2 corresponding to the thickness H of the ridge 13. Prefer to be 0.2 times 1.2 times more preferable. If it is smaller than 0.1, the thickness of the unit electrode 2 is so small that dielectric breakdown may occur and uniform discharge may not be obtained. If it is larger than 5 times, the opening ratio will be less than 20%, which may affect engine performance.
- the width W of the ridge 13 shown in Fig. 6 is preferably 0.1 to 5 times the interval corresponding to the thickness H of the ridge. It is more preferable that it is 0.2 times 1 times 2 times.
- the width W of the ridge is smaller than 0.1 times, the strength reliability of the plasma generating electrode 100 as a structure may be reduced. If it is larger than 5 times, the capacitance of the ridge 13 increases, the energy entering the space V decreases, and it becomes impossible to obtain highly efficient plasma.
- the distance between the adjacent ridges 13 is L force S and the distance corresponding to the ridge thickness H is 0.2 to 20 times 0.5 to 10 times. More preferably, there is. If it is less than 0.2 times, the opening ratio becomes small, and when used in an exhaust gas system of an engine, it has the power S to deteriorate the engine performance. If it is larger than 20 times, the interval between the adjacent ridges 13 is widened, so that it may be difficult to efficiently transfer the surface discharge to the barrier discharge. In this case, in order to obtain a uniform discharge, More energy injection may be required.
- a ceramic green sheet to be the above-mentioned ceramic molded body is formed.
- at least one material selected from the group consisting of alumina, mullite, zirconia, cordierite, silicon nitride, aluminum nitride, ceramic glass, and glass is added to the above-mentioned sintering aid, butyral-based resin, cellulose-based resin, and the like.
- a binder, a plasticizer such as DOP or DBP, an organic solvent such as toluene or butadiene, etc. are squeezed and thoroughly mixed using an alumina pot and alumina cobblestone to produce a slurry for green sheet production.
- these materials may be manufactured by mixing with a ball mill using a monoball.
- the obtained slurry for producing a green sheet is stirred under reduced pressure to remove bubbles, and further adjusted to have a predetermined viscosity.
- the slurry for green sheet production adjusted in this way One is formed into a tape by a tape forming method such as a doctor blade method to form an unfired ceramic formed body.
- a conductor paste for forming a conductive film disposed on one surface of the obtained unfired ceramic molded body is formed.
- This conductor paste can be formed by, for example, kneading a binder and a solvent such as terpineol into silver powder and sufficiently kneading the mixture using a triroll mill.
- the conductive paste thus formed is printed on the surface of the unfired ceramic molded body using screen printing or the like to form a conductive film having a predetermined shape.
- An unfired ceramic molded body 31 is produced.
- the conductive film covers almost the entire center of the surface of the unfired ceramic molded body, and the width direction (the above-mentioned one direction) is near both ends on the side having no cutting allowance C. It is arranged in a square shape at the center of the box. Then, one of the rectangular conductive films is formed continuously with the conductive film covering almost the whole centering on the center.
- FIG. 7 is a perspective view schematically showing a process of manufacturing one embodiment of the plasma generating electrode of the present invention.
- the above-described unfired ceramic formed body 31 provided with the conductive film is provided on the surface of the unfired ceramic formed body 31 provided with the conductive film, on the side where the conductive film is provided.
- An unfired ceramic formed body 32 having only the square conductive film at both ends is provided by the same method as the manufactured method, and the conductive film is sandwiched between two unfired ceramic formed bodies.
- An electrode 33 is formed.
- the outer shape of the unfired ceramic formed body 32 is substantially the same as the outer shape of the unfired ceramic formed body 31 provided with the conductive film.
- the obtained basic unit electrode 33 has a cutting margin C to be cut and removed later.
- the outer shape is almost the same as that of the basic unit electrode 33, and the thickness force S and the basic unit 1 (FIG. 1 (a), as shown in Fig. 1 (b)), the thickness of the ridge 13 (see Fig. 1 (a), Fig. 1 (b)) and the direction in which the ridges are arranged
- the side parallel to the ridge 13 is slightly longer than the length of the ridge 13 (see FIGS. 1 (a) and 1 (b)) and the side perpendicular to the direction in which the ridge 13 is arranged is the ridge 13 (FIG. 1 (a), (See Fig.
- a plate-shaped ridge forming frame 35 is formed in which a plurality of through holes 34 having one shape are formed.
- the ridge forming frame 35 is cut into a predetermined shape by knife cutting.
- a rectangular conductive film is disposed at a position of the unit electrode 33 of the ridge forming frame 35 overlapping the rectangular conductive film.
- These square conductive films formed at both ends need not be square, but may be circular, elliptical, polygonal, or other irregular shapes.
- One side of the above-described through hole 34 parallel to the direction in which the ridges are arranged may be the same as the length of the ridges 13 (see FIGS. 1 (a) and 1 (b)).
- the ridge forming frame 35 has cutting margins C at both ends perpendicular to the direction in which the ridges of the through holes 34 are arranged.
- the conduction through-hole (first The through hole 36 for conduction and the second through hole 37) for conduction are formed.
- the same unit electrode 33 provided with the ridge forming frame 35 obtained as described above was manufactured, and as shown in FIG. 7, the conductive film was not provided.
- the basic unit electrodes 33 provided with the two ridge forming frames 35 are stacked so that the electrode terminals 38 of the fired ceramic formed body 31 face the opposite sides. As a result, a basic unit before firing having a cutting allowance C is formed.
- the unfired ceramic formed body 31 provided with the conductive film is disposed so that the electrode terminals 38 face the opposite sides.
- the green ceramic body 31 provided with the conductive film may be provided so as to face the surface.
- the unfired basic units having the cutting allowance C are laminated, for example, in three stages to form an unfired electrode unit having the cutting allowance C.
- the number of stacked basic units is not limited to three, and any number of layers may be stacked according to the purpose.
- the basic units before firing having the cutting allowance C are prepared in advance, and are laminated as necessary, so that when the plasma generating electrode is prepared by firing, the connection state between the basic units is formed.
- the basic unit can be manufactured in advance, and can be manufactured by laminating the basic units, the assembly of components is not complicated, and the productivity can be improved.
- each of the basic unit electrode 33 and the ridge forming frame 35 is cut and removed on a plane substantially perpendicular to the surface of the basic unit electrode 33.
- both ends of the through hole 34 of the ridge forming frame 35 in the direction perpendicular to the direction in which the ridges are arranged are opened, and the basic unit 1 shown in FIGS. 1 (a) and 1 (b) is opened.
- a plurality of spaces V having both ends in the disposition direction D of the ridge 13 and the ridge 13 are formed to form the unit electrode 2 and the basic unit 1.
- the range of the cutting allowance C of each of the basic unit electrode 33 and the ridge forming frame 35 is such that when the cutting allowance C is cut and removed, the ridge of the through hole 34 of the ridge forming frame 35 is removed. It is formed in such a range that both ends in the direction perpendicular to the disposing direction are open.
- the obtained electrode unit before firing is fired, and a plurality of basic units 1 shown in FIG.
- the electrode unit 5 in which the unit electrode 2 and the space V are three-dimensionally arranged is produced, and the force S for obtaining the plasma generating electrode 100 can be obtained.
- both ends in the arrangement direction D of the unit electrode 2 and the ridge 13 shown in FIGS. 1 (a) and 1 (b) are opened.
- Plural space V force The outer shape of the unit electrode 33 (see Fig. 7) with the cutting allowance C (see Fig. 7) added to the outer shape of the unit electrode 2 has the outer shape of the unit electrode 33 (Fig. 7).
- the thickness is the same as that of the ridge 13, and one side parallel to the direction of the ridge is the same as or longer than the length of the ridge 13.
- a plate-shaped ridge forming frame 35 (see Fig. 7) having a plurality of through-holes 34 (see Fig.
- the basic unit electrode 33 (see FIG. 7) and the ridge forming frame 35 (see FIG. 7) are placed at one end of the space V on one surface of the basic unit electrode 33 (see FIG. 7). Cut in a plane almost perpendicular to It is preferably formed by the following.
- the plasma generation electrode of the present embodiment may be manufactured by another method described below.
- a plurality of ridges 43 are disposed substantially parallel to a plate-shaped ceramic body 42, A ridge-arranged ceramic body 41 is formed by extrusion molding, and an end face conductive film 47 is provided on an end face portion. Then, a plate-like ceramic body 44 constituting the conductive film-provided ceramic body 46 shown in FIG. 9 is formed by extrusion molding.
- Examples of the method of manufacturing the ridge-arranged ceramic body 41 and the plate-like ceramic body 44 include alumina, mullite, zirconia, cordierite, mullite, titanium-barium oxide, magnesium-calcium-titanium oxide, At least one material selected from the group consisting of barium-titanium-zinc oxide, silicon nitride, aluminum nitride, ceramic glass, and glass is added to a sintering aid, a molding aid such as methylcellulose, and a surfactant. The mixture is kneaded with an agent and water, and a rod-shaped shrink is obtained with a kneading machine. After extruding with a plunger-type extruder, the protrusion-arranged ceramic bodies 41 and 41 shown in FIG. 8 are obtained. The plate-shaped ceramic molded body 44 shown can be obtained.
- the conductive film 45 is provided on the plate-like ceramic body 44 by printing, for example, by a screen printing method. It is preferable that the conditions such as the material of the conductive film 45, the method of disposing the conductive film 45 on the ceramic body 44, and the like are the same as those in the above-described method of manufacturing the plasma generating electrode of the present embodiment.
- a paste having the same composition as that of the molding material is applied, and the ridge-arranged ceramic bodies 41 are stacked to form an integrated body.
- the basic unit of can be obtained.
- the basic unit is further coated with a paste having the same composition as the molding material, and is stacked and dried and fired to obtain an integrated electrode unit. It can be a plasma generating electrode. After drying the basic unit, it is coated with a paste having the same composition as the molded body, dried again, and fired to obtain an integrated laminated electrode unit.
- FIGS. 10 (a) and 10 (b) schematically show one embodiment of the plasma reactor of the present invention
- FIG. 10 (a) includes the direction in which the fluid to be treated passes, and the unit electrode.
- FIG. 10 (b) is a cross-sectional view taken along a plane BB ′ perpendicular to the direction in which the fluid to be processed shown in FIG. 10 (a) passes.
- a plasma reactor 51 according to the present embodiment has a plasma generating electrode according to an embodiment of the present invention as shown in FIG. A generating electrode 100 ) is provided.
- the plasma reactor 51 includes a plasma generation electrode 100 and a gas containing a predetermined component in a space V that is three-dimensionally arranged between a plurality of unit electrodes 2 that constitute the plasma generation electrode 100 (coated). And a case body 52 housed in a state in which the processing fluid can be introduced.
- the case body 52 has an inlet 53 into which the fluid to be processed flows, and an outlet 54 from which the inflowing fluid passes between the unit electrodes 2 and flows out the processed fluid.
- the plasma reactor 51 of the present embodiment includes the plasma generation electrode 100 shown in Fig. 3, uniform and stable plasma can be generated with low power.
- the plasma reactor 51 of the present embodiment when the plasma generating electrode 100 is provided, in order to prevent breakage, an insulating and heat-resistant material is provided between the case body 52 and the plasma generating electrode 100. It is preferable to interpose a buffer material.
- a buffer material In FIG. 10, for the sake of explanation, the force S indicating a state where the basic units 1 are stacked in three layers, and the number of the basic units 1 to be stacked are not limited thereto.
- the material of the case body 52 used in the present embodiment is not particularly limited, but, for example, it has excellent conductivity, is lightweight and inexpensive, and has little deformation due to thermal expansion. , Preferably ferrite stainless steel.
- the plasma reactor 51 configured as described above can be used, for example, installed in an exhaust system of an automobile.
- the plasma reactor 51 generates exhaust gas in a space V formed between the unit electrodes 2.
- harmful substances such as soot and nitrogen oxide, which are the above-mentioned predetermined components, contained in the exhaust gas can be reacted and discharged as harmless gas to the outside.
- the plasma reactor of the present embodiment may further include a power supply for applying a voltage to the plasma generation electrode.
- a power supply a conventionally known power supply can be used as long as it can supply electricity that can effectively generate plasma.
- the plasma reactor of the present embodiment may have a configuration in which a current is supplied from an external power source instead of the configuration including the power source as described above.
- the current supplied to the plasma generation electrode used in the present embodiment can be appropriately selected and determined depending on the intensity of the generated plasma.
- the current supplied to the plasma generating electrode is a DC current with a voltage of lkV or more, a peak voltage force of SlkV or more, and the number of pulses per second is 100.
- the pulse current is a pulse current having the above (100 Hz or more), an AC current having a peak voltage of lkV or more and a frequency of 100 or more (100 Hz or more), or a current obtained by superposing any two of them. With such a configuration, it is possible to efficiently generate plasma.
- a unit (six-stage electrode unit) in which six unit electrodes 2 (alumina dielectric electrodes) shown in Fig. 3 were stacked was fabricated.
- the size of the first electrode was 50 x 100 x lmm
- the inner conductive film (electrode) was printed with a tungsten paste of 40 x 80 mm wide and 10 / im thick.
- conductive film through holes having a diameter of 3 mm and an interval of 5 mm were regularly arranged such that the centers of the through holes were located at the vertices of an equilateral triangle. Protrusions with a width of 2 mm and a height of lmm were provided at intervals of 18 mm.
- Protrusions with a width of 8 mm and a height of lmm were provided at both ends of the electrode, and a through-hole for conduction with a diameter of 3 mm was made at the center.
- a conductive film was formed inside the through hole for conduction with a tungsten paste and a nickel plating on the tungsten paste.
- Ten six-stage electrode units with a thickness of 12mm are stacked, fixed with a metal frame, and the outer periphery is held by a heat insulating mat, and is loaded into a cylindrical metal container made of SUS430 to obtain a plasma reactor.
- a plasma reactor was attached to a burner spalling apparatus, and a heating-cooling test (burner spalling test) between 100 ° C and 600 ° C was performed. After the 1000 cycle test, the six-stage electrode unit inside the metal container was observed, but no damage was observed.
- the burner spalling device a device capable of alternately blowing a high-temperature combustion gas and a cooling gas from a gas burner to a plasma reactor was used.
- Example 1 The plasma reactor of Example 1 was subjected to a 30 G, 200 Hz vibration test. After the test for 100 hours, no force S or breakage was observed when the internal 6-stage electrode unit was observed.
- the structure of the one-stage unit electrode is the same as in Example 1.
- An electrode unit was fabricated by stacking 60 sheets at an interval of lmm and firing as an integral unit in a cylindrical metal container made of SUS430. Charged to obtain a plasma reactor. The same burner spalling test as in Example 1 was performed. With one heating and cooling between 100_600 ° C, the electrode unit was damaged.
- a sheet having regular ridges shown in FIG. 8 was produced by extrusion.
- the thickness of the flat part is 0.25 mm after firing, the height of the ridges regularly arranged on the flat part is 0.75 mm after firing, and the width of the ridge is 0.5 mm after firing.
- the ridge spacing was set to 5 mm after firing.
- the ridges at both ends were set to have a width of 5 mm after firing, and the total length of the extruded sheet was 70 mm after firing.
- the raw material used was 93% pure alumina. 5% of methyl cellulose as an extrusion molding aid, a surfactant and water were kneaded, kneaded and extruded.
- the extruded sheet was cut to a width of 60 mm after firing in the longitudinal direction of the ridge, and the sheet was cut and calcined at 1100 ° C. in the atmosphere to obtain a ridge-arranged ceramic body having the shape shown in FIG.
- a plate-like ceramic body shown in FIG. 9 was obtained. 0.25m thickness after firing A plate-like sheet having dimensions of 70 m and a width of 70 mm was extruded. After firing, it was cut to a width of 60 mm and calcined at 1100 ° C. in the air to obtain a plate-like ceramic body shown in FIG.
- the conductive film after firing was printed on one side by a screen printing method with a thickness of 10 ⁇ m so as to have a size of 58 x 60 mm.
- Five ceramic bodies provided with ridges and plate-like ceramic bodies on which a conductor film was printed were alternately stacked to obtain an integrated molded body. After printing the same conductive film on both sides, return N_H
- a five-stage integrated electrode unit (plasma generating electrode) was obtained. After stacking the five-stage units in seven stages and fixing them with a metal frame, the outer periphery was held by a heat insulating mat and loaded into a cylindrical metal container made of S US430 to obtain a plasma reactor.
- a pulse power supply using a thyristor element was connected to the plasma reactor, and discharge performance was evaluated.
- a uniform barrier discharge was obtained at all stages by 80 mjZ pulse energy injection at 8 kV and 2 kpps.
- the NO amount was 60 ppm at the latter stage of the power reactor at 200 ° C with the exhaust gas model gas containing N-200ppm flowing.
- the plasma generating electrode and the plasma reactor of the present invention remove harmful components such as NO, carbon fine particles, HC, and CO contained in engine exhaust gas and various types of incinerator exhaust gas, and discharge them to the outside. Can be used to purify these waste gases. And because it can generate uniform and stable plasma, it is possible to efficiently remove harmful components of exhaust gas, and because of its excellent heat resistance, it can be used at high temperatures for a long time. is there.
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Abstract
Description
Claims
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US10/561,841 US7771673B2 (en) | 2003-06-27 | 2004-06-25 | Plasma generating electrode and plasma reactor |
JP2005511057A JP4448095B2 (ja) | 2003-06-27 | 2004-06-25 | プラズマ発生電極及びプラズマ反応器 |
EP04746483.9A EP1643093B1 (en) | 2003-06-27 | 2004-06-25 | Plasma generating electrode and plasma reactor |
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JP2003-184092 | 2003-06-27 | ||
JP2003184092 | 2003-06-27 | ||
JP2003369886 | 2003-10-30 | ||
JP2003-369886 | 2003-10-30 |
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US (1) | US7771673B2 (ja) |
EP (1) | EP1643093B1 (ja) |
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EP1708242A1 (en) * | 2005-03-30 | 2006-10-04 | Ngk Insulators, Ltd. | Plasma generating electrode and plasma reactor |
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CN107706080A (zh) * | 2017-11-13 | 2018-02-16 | 珠海倍力高科科技有限公司 | 一种多棱角整板电极 |
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- 2004-06-25 JP JP2005511057A patent/JP4448095B2/ja not_active Expired - Fee Related
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JP2006063893A (ja) * | 2004-08-26 | 2006-03-09 | Kyocera Corp | 排気ガス処理用セラミック部材および排気ガス処理装置 |
JP4637531B2 (ja) * | 2004-08-26 | 2011-02-23 | 京セラ株式会社 | 排気ガス処理用セラミック部材および排気ガス処理装置 |
US7608796B2 (en) | 2005-03-30 | 2009-10-27 | Ngk Insulators, Ltd. | Plasma generating electrode and plasma reactor |
EP1708242A1 (en) * | 2005-03-30 | 2006-10-04 | Ngk Insulators, Ltd. | Plasma generating electrode and plasma reactor |
JP2009524203A (ja) * | 2006-01-23 | 2009-06-25 | ザ ボード オブ トラスティーズ オブ ザ ユニバーシティ オブ イリノイ | セラミック内に埋込電極を備えるアドレス指定可能なマイクロプラズマデバイスおよびアレイ |
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JP5150482B2 (ja) * | 2006-03-30 | 2013-02-20 | 日本碍子株式会社 | 排気ガス浄化装置 |
JP2010503962A (ja) * | 2006-09-14 | 2010-02-04 | シーエムテック カンパニー リミテッド | プラズマ反応器 |
JP4763059B2 (ja) * | 2006-10-31 | 2011-08-31 | 京セラ株式会社 | プラズマ発生体及び装置、並びにプラズマ発生体の製造方法 |
JP2008251521A (ja) * | 2007-03-05 | 2008-10-16 | Kyocera Corp | プラズマ発生体、プラズマ発生装置、オゾン発生装置、排ガス処理装置 |
JP2008251516A (ja) * | 2007-03-05 | 2008-10-16 | Kyocera Corp | プラズマ発生体、プラズマ発生装置、オゾン発生装置、排ガス処理装置 |
EP2081417A2 (en) | 2008-01-16 | 2009-07-22 | Ngk Insulator, Ltd. | Ceramic plasma reactor and reaction apparatus |
US8367966B2 (en) | 2008-01-16 | 2013-02-05 | Ngk Insulators, Ltd. | Ceramic plasma reactor and reaction apparatus |
JP2009191739A (ja) * | 2008-02-14 | 2009-08-27 | Ngk Insulators Ltd | プラズマ反応器、及びプラズマ反応装置 |
JP2011111902A (ja) * | 2009-11-24 | 2011-06-09 | Calsonic Kansei Corp | 排気浄化装置 |
JP2018122238A (ja) * | 2017-01-31 | 2018-08-09 | ダイハツ工業株式会社 | プラズマリアクタ |
JP2019181409A (ja) * | 2018-04-17 | 2019-10-24 | 日本特殊陶業株式会社 | プラズマリアクタ及びその制御方法 |
JP7101521B2 (ja) | 2018-04-17 | 2022-07-15 | ダイハツ工業株式会社 | プラズマリアクタ及びその制御方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1643093A4 (en) | 2008-04-09 |
JP4448095B2 (ja) | 2010-04-07 |
US7771673B2 (en) | 2010-08-10 |
US20060153750A1 (en) | 2006-07-13 |
EP1643093B1 (en) | 2013-07-31 |
EP1643093A1 (en) | 2006-04-05 |
JPWO2005001250A1 (ja) | 2006-11-02 |
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