EP2022953A1 - Plasmareaktorelektrode - Google Patents

Plasmareaktorelektrode Download PDF

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Publication number
EP2022953A1
EP2022953A1 EP07744142A EP07744142A EP2022953A1 EP 2022953 A1 EP2022953 A1 EP 2022953A1 EP 07744142 A EP07744142 A EP 07744142A EP 07744142 A EP07744142 A EP 07744142A EP 2022953 A1 EP2022953 A1 EP 2022953A1
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EP
European Patent Office
Prior art keywords
specific surface
surface area
plasma
exhaust gas
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07744142A
Other languages
English (en)
French (fr)
Inventor
Yoonho Kim
Kazuya Naito
Hirohisa Tanaka
Isao Tan
Mitsuhiro Wakuda
Takashi Ogawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daihatsu Motor Co Ltd
Original Assignee
Daihatsu Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daihatsu Motor Co Ltd filed Critical Daihatsu Motor Co Ltd
Publication of EP2022953A1 publication Critical patent/EP2022953A1/de
Withdrawn legal-status Critical Current

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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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • F01N3/0275—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means using electric discharge means
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/28—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a plasma reactor

Definitions

  • the present invention relates to a plasma reactor electrode used in an apparatus, etc., for removing components contained in a smoke exhaust discharged from a factory, plant, internal combustion engine, etc., and having an adverse effect on an environment.
  • a method of forcibly combusting and removing the accumulated PM by increasing a temperature of the exhaust gas is used with a DPF.
  • forced combustion a method of forcibly combusting and removing the accumulated PM by increasing a temperature of the exhaust gas (forced combustion) is used with a DPF.
  • fuel is intentionally fed to the catalyst by post injection or injector injection and a reaction heat generated in this process is used, excess fuel besides that used for engine combustion is necessary and consequently, degradation of fuel consumption occurs.
  • a plasma reactor described in Patent Document 1 has a plasma inducer that generates plasma. After putting the plasma in contact with an exhaust gas, the exhaust gas is passed through a filter to make soot particles, in other words, the PM in the exhaust gas be retained in the filter and the PM is combusted by the plasma.
  • An object of the present invention is to provide a plasma reactor electrode capable of effectively removing PM (particulate matter) while suppressing increase of exhaust pressure of an exhaust gas.
  • a plasma reactor electrode according to a first aspect of the present invention is installed in a plasma reactor, disposed in an exhaust gas flow path through which an exhaust gas passes, and includes: a first region, having a first specific surface area (low specific surface area region) ; and a second region, having a second specific surface area (high specific surface area region) higher than the first specific surface area.
  • the present inventors have confirmed that the lower the specific surface area of the electrode, the higher the light emission luminance ( FIG. 5 ).
  • the present inventors found that the higher the light emission luminance in a process of plasma generation from the electrode, the greater a difference of PM removal rate between a plasma generating state and a plasma non-generating state ( FIG. 5 ).
  • the low specific surface area region is preferably positioned upstream the high specific surface area region in the exhaust gas flow path.
  • the plasma reactor electrode With the plasma reactor electrode with the above configuration, by disposing the low specific surface area region at the upstream side in the exhaust gas flow path, a large amount of plasma can be generated at the upstream side, the PM can be captured reliably by disposing the high specific surface area region of high PM capturing performance at the downstream side, and the PM can be oxidized, in other words, combusted favorably by an action of the plasma generated in the high specific surface area region and the plasma or a plasma-activated exhaust gas component generated at the low specific surface area region at the upstream side and moving along with the exhaust gas to the downstream side.
  • the present invention is not limited to a mode where the low specific surface area region and the high specific surface area region are disposed integrally, and these regions may respectively be separate bodies. Also, the low specific surface area region and the high specific surface area region may be disposed apart from each other.
  • the light emission luminance of the plasma is significantly high in a region with a specific surface area of no more than 1000m2/m3, and by disposing the region with the specific surface area of no more than 1000m2/m3 as the low specific surface area regionpositioned at the upstream side in the exhaust gas flow path, the plasma exhibiting the high light emission luminance can be made to act on the PM not only in the low specific surface area region but also in the high specific surface area region at the downstream side to which the plasma moves along the exhaust gas flowpath. Aconfiguration is thus realized where the plasma can be made to act favorably in the high specific surface area capable of adequately capturing the PM.
  • a plasma reactor electrode according to a second aspect of the present invention includes a region having a specific surface area of no more than 1000m2/m3 and region differing from the aforementioned region and having a specific surface area of no less than 1000m2/m3.
  • the PM removal performance can be improved effectively by the plasma exhibiting the high light emission luminance as described above, and by the region having the specific surface area of no less than 1000m2/m3, the PM capturing performance can be improved effectively, thereby realizing an electrode enabling capture of the PM at a high probability while enabling the plasma generated in a state of high light emission luminance to react with the captured plasma.
  • a region constituting a porous structure is included to further facilitate the capture of the PM.
  • a region, having a structure where a plurality of protrusions, at which charges concentrate, are formed on a surface may be included.
  • the first aspect of the present invention including, in the exhaust gas flowpath, the low specific surface area region and the high specific surface area region, having the specific surface area higher than the specific surface area of the low specific surface area region, while capturing the PM at a high probability by significant improvement of the PM capturing performance by the provision of the high specific surface area region, increase of the exhaust pressure of the exhaust gas can be suppressed by the provision of the low specific surface area region.
  • the high specific surface area region at the downstream side of the low specific surface area region in the exhaust gas flow path, a large amount of plasma can be generated at the upstream side, the PM can be captured reliably by the high specific surface area region of high PM capturing performance disposed at the downstream side, and the PM can be oxidized, in other words, combusted favorably by the action of the plasma, generated in the high specific surface area region, and the plasma, moving to the downstream side along with the exhaust gas that has passed through the plasma field generated by the low specific surface area region at the upstream side.
  • the second aspect of the present invention including the region having the specific surface area of no more than 1000m2/m3 and the region having the specific surface area of no less than 1000m2/m3, while capturing the PM at a high probability by significant improvement of the PM capturing performance by the provision of the region having the specific surface area of no less than 1000m2/m3, increase of the exhaust pressure of the exhaust gas can be suppressed by the provision of the region having the specific surface area of no more than 1000m2/m3.
  • a plasma reactor electrode capable of effectively removing PM (particulate matter) while suppressing increase of an exhaust pressure of an exhaust gas can thus be provided.
  • a plasma reactor P As shown in FIGS. 1 and 2 , a plasma reactor P according to the present embodiment is installed in an exhaust gas flow path H through which an exhaust gas discharged, for example, from a diesel engine or other internal combustion engine E passes, and has a structure where electrodes 1 and dielectrics 2 are laminated alternately in an interior of a casing P1 of the plasma reactor P.
  • the exhaust gas passes through along a direction indicated by arrows in which the electrodes 1 and the dielectrics 2 extend.
  • particulate matter PM indicated by PM, is illustrated schematically.
  • Each dielectric 2 is disposedbetween two of the electrodes 1 as shown in FIG. 2 , and although in the present embodiment, a plate material composed of alumina is employed, the present invention is not limited by this configuration of the dielectrics 2 and dielectrics of various shapes may be employed.
  • each plasma reactor electrode 1 is installed in the plasma reactor P disposed in the exhaust gas flow path H through which the exhaust gas passes and is characterized in including at least a low specific surface area region (first region) 1a positioned at an upstream side in the exhaust gas flow path H and a high specific surface area region (second region) 1b having a higher specific surface area than the low specific surface area region 1a.
  • the electrode 1 according to the present embodiment is characterized in including a region in which the specific surface area is no more than 1000m2/m3, that is, the low specific surface area region 1a having openings of pore diameter no less than a fixed dimension, and a region in which the specific surface area is no less than 1000m2/m3, that is, the high specific surface area region 1b having openings of pore diameter no more than the fixed dimension.
  • the specific surface area can be measured in compliance with ISO 9277.
  • the electrode 1 is composed, for example, of nickel or copper.
  • the low specific surface area region 1a and the high specific surface area region 1b are configured as porous structures.
  • the low specific surface area region 1a and the high specific surface area region 1b are connected, for example, by brazing, and for the connection, any of various conductive materials having heat resistance may be employed and a method for connection is not restricted to brazing and any of various existing connection methods may be employed.
  • the electrode 1 has the porous structure shown specifically in FIG. 2 in likewise manner in both the low specific surface area region 1a and the high specific surface area region 1b. That is, the respective surfaces have shapes with practically no flat portions and have a plurality of penetrating pores 10a and 10b penetrating through at least from one surface to another surface, a plurality of recesses 11a and 11b that are depressed at the respective surfaces but do not penetrate through, and a plurality of protrusions 12a and 12b.
  • the respective surfaces have uneven shapes and have height differences formed across substantially the entireties, and the protrusions 12a and 12b become portions at which charges concentrate when a voltage is applied to the electrodes 1 and contribute to improving efficiency of plasma discharge.
  • the recesses 11a and 11b are not necessarily required and may be formed as portions lower than the protrusions 12a and 12b by the forming of the protrusions 12a and 12b.
  • the penetrating pores 10a and 10b do not necessarily have to penetrate directly through from one surface to another surface. It suffices that upon installation in the plasma reactor P, the exhaust gas can pass through from an upstream side to a downstream side. In this case, the penetrating pores 10a and 10b do not necessarily have to be straight and may be bent or branched in a forked or triple forked manner, etc.
  • the low specific surface area region 1a has the specific surface area no more than 1000m2/m3 and includes the penetrating pores 10a that open at no less than fixed dimension and is thereby set to make a light emission luminance of the plasma high and enabled to make the exhaust gas in the low specific surface area region 1a be activated, that is, have a high energy.
  • a low specific surface area region exhibiting, for example, a specific surface area of 500m2/m3 and having openings of approximately 1.9mm diameter is employed.
  • the specific surface area of the high specific surface area region 1b is set higher than that of the low specific surface area region 1a to improve the particulate matter PM capturing performance.
  • the high specific surface area region has, for example, a specific surface area of 1250m2/m3 and has penetrating pores 10b with openings of approximately 0.9mm diameter.
  • an inner diameter or inner dimension of the penetrating pores 10b can be set to a dimension that makes the penetrating pores 3 in the high specific surface area region 1b particularly difficult to pass through.
  • the particulate matter PM can thereby be lowered in speed of passage through the penetrating pores 10b and be retained inside the electrode 1 for no less than a predetermined time in which the particulate matter PM can be combusted by the plasma.
  • a pressure loss can be made low.
  • the recesses 11b are not limited in size and shape, a size enabling the particulate matter PM to be adsorbed readily by a diffusion mechanism is preferable.
  • the exhaust gas flows into the penetrating pores 10a of the low specific surface area region 1a from the upstream side, passes through the penetrating pores 10a, and moves into the penetratingpores 10b of the high specific surface area region 1b at the downstream side as shown in FIG. 2 .
  • each electrode 1 thus also functions as a filter with respect to the particulate matter PM. Because carbon particles constitute a main element of the particulate matter PM, the captured particulate matter PM also functions as a portion of the electrodes 1. Thus, when a voltage is applied to the electrodes 1, electrons 1 are discharged from the electrode 1 itself as well as from the captured particulate matter PM and plasma discharge is thereby started. Thus, even if the particulate matter PM are collected, the plasma can be generated without lowering of discharge efficiency.
  • the particulate matter PM retention time can be secured reliably by the high specific surface area region 1b having the penetrating pores 10b with openings of 0.9mm diameter so that the specific surface area is no less than 1000m2/m3, the particulate matter PM captured in the penetrating pores 10a and 10b are successively combusted from surfaces thereof and made small in diameter and finally removed by being oxidized completely as schematically shown in FIG.
  • a plasma reactor electrode A1 according to the modification example of the present embodiment employs a metal plate A1 having, as the low specific surface area region 1a, a structure with a plurality of cut surfaces A14 formed on a surface as charge-concentrating protrusions.
  • a thickness of the electrode A1 is for example 200 ⁇ 10-6m (meters) and is not limited to this value as long as a strength adequate for maintaining the substantially wave-like shape mentioned above can be obtained.
  • the metal plate A1 includes raised portions A11 and depressed portions A12 in a continuous, alternating manner in a lateral direction.
  • the metal plate A1 also has the raised portions A11 and the depressed portions A12 in a continuous, alternating manner in a longitudinal direction.
  • the longitudinal direction is a direction in which the exhaust gas flows (direction indicated by arrows in FIG. 3 ).
  • the lateral direction is a direction substantially orthogonal to the longitudinal direction.
  • the specific surface area of the metal plate A1 is no more than 1000m2/m3 as in the embodiment described above.
  • a plurality of, that is, several cut surfaces A14 exposed toward the longitudinal direction are formed at the boundaries of the raised portions A11 and the depressed portions A12 in the same manner as at an end surface A13 of the metal plate A1 in the longitudinal direction.
  • An opening of 5mm diameter is formed by each cut surface A14.
  • the cut surfaces A14 which are portions where charges generated upon application of voltage to the electrode 1 concentrate, may be formed, for example, by cutting a raised portion A11 that is continuous in the longitudinal direction to depress the raised portion A11 at predetermined intervals.
  • the present modification example has a shape where, in the lateral direction, the raised portions A11 and the depressed portions A12 continue alternately at portions and the raised portions A11 and the depressed portions A12 are continuous at other portions, and the present invention includes such a shape, and although not illustrated, the present invention obviously also includes a structure where raised portions A11 and depressed portions A12 of the same length continue alternately in the lateral direction.
  • Such a metal plate A1 can be manufactured for example by passing a metal plate material between two rotating bodies, having recesses and protrusions, while pressing the metal plate material.
  • the metal plates A1 of the same shape can be manufactured readily, thereby enabling reduction of manufacturing cost.
  • lightweightness and reduction of pressure loss can be achieved.
  • a metal plate B1 having a plurality of charge-concentrating portions formed by cutting and raising so as to protrude from one surface of a flat metal plate material, is employed as shown in FIG. 4 as the low specific surface area region 1a in a manner similar to the above-described modification example. That is, with the metal plate B1, protrusions B10, each having a triangular pyramidal shape formed by cutting and raising, are separated at predetermined distances, in other words, disposed at predetermined pitches in a longitudinal direction and a lateral direction. The longitudinal direction and the lateral direction are the same as those of the above-described modification example.
  • the specific surface area of the metal plate B1 is set to no more than 1000m2/m3.
  • each protrusion B10 a bottom surface of the triangular pyramidal shape is made a penetrating pore and side surfaces B11 are formed so as to cover the penetrating pore.
  • the two side surfaces B11 are separated at a front side in the longitudinal direction and are joined at a rear side in the longitudinal direction.
  • An opening B12 of triangular shape is thereby formed at the front side in the longitudinal direction of the protrusion B10 and a cut surface B13 substantially equal to a plate thickness of the metal plate material is formed at a periphery of the opening B12.
  • each protrusion B10 is disposed at an intermediate position between protrusions B10 in a front column so as not to overlap with a protrusion B10 in the front column. That is, the respective protrusions B10 are positioned so as to be centered at respective apexes of a triangular network.
  • a ridge B14 formed by the respective side surfaces B11, and an apex B15, positioned above the opening B12, take on sharp shapes, and these, together with an edge forming the cut surface B13, cause the concentration of charges to be significant.
  • the protrusions B10 do not necessarily have to be disposed at predetermined pitches and may respectively be positioned randomly or arbitrarily. With the protrusions B10, although it is easy to manufacture those of the same height when a cutting and raising process is performed, the protrusions do not necessarily have to be made the same in height and it suffices that the protrusions have a clear cut surface B13 and a sharp apex B15.
  • the electrodes 1 for the plasma reactor P by including both the low specific surface area region 1a, having the specific surface area of no more than 1000m2/m3 and openings with the pore diameter of no less than the fixed dimension and being high in radiation luminance by plasma, that is, being high in particulate matter PM removal performance by the plasma, and the high specific surface area region 1b, having the specific surface area of no less than 1000m2/m3 and openings with the pore diameter of no more than the fixed dimension and being high in the particulate matter PM capture rate, the particulate matter PM removal performance by the plasma is made high by activation of the exhaust gas by the electrodes 1 as a whole and the time in which the particulate matter PM is retained inside the electrodes 1 and made to react with the plasma can be secured effectively.
  • the exhaust gas containing the particulate matter PM can be retained or temporarily captured for an adequate time by the high specific surface area region 1b upon the exhaust gas being put in a state of high energy by plasma being generated at high luminance in the low specific surface area region 1a.
  • the plasma can thus be made to react favorably at an adequate activity and for an adequate reaction time with the particulate matter PM.
  • each electrode 1 includes the low specific surface area region 1a positioned at the upstream side in the exhaust gas flow path H and the high specific surface area region 1b positioned at the downstream side and having the specific surface area higher than that of the low specific surface area region 1a, the plasma is generated at the state of high light emission luminance at the upstream side, and by disposing the high specific surface area region 1b of high particulate matter PM passage inhibiting performance at the downstream side, the particulate matter PM can be oxidized, in other words, combusted favorably by action of the plasma, generated in the high specific surface area region 1b, and the plasma, generated at the low specific surface area region 1a at the upstream side and moving along with the activated exhaust gas to the downstream side, while securing the particulate matter PM inside the electrode 1 reliably for an adequate time.
  • the particulate matter PM can be positioned and oxidized/combusted in the exhaust gas that has been activated for an adequate time.
  • the plasma can thus be made to act for an adequate time in the state where the exhaust gas is activated by the plasma in the high specific surface area capable of adequately retaining the particulate matter PM.
  • the role of the electrode 1 can be served while retaining or temporarily capturing the particulate matter PM favorably.
  • the low specific surface area region 1a is made to have a structure having the plurality of cut surfaces A14 or cut surfaces B13, which are charge-concentratingprotrusions, formed on the surface to make high the light emission luminance of the plasma favorably, readily activate the exhaust gas, and further improve the particulate matter PM removal performance by the plasma.
  • the low specific surface area region and the high specific surface area region are disposed along the direction of extension of the exhaust gas flow path, that is, the direction in which the exhaust gas flows
  • the low specific surface area region and the high specific surface area region may instead be disposed in a direction orthogonal to the direction in which the exhaust gas flows.
  • the specific surface area maybe varied in the direction orthogonal to the direction of flow of the exhaust gas by respectively laminating electrodes having mutually different uniform specific surface areas, or the specific surface area may be varied in the orthogonal direction in a single electrode.
  • electrodes respectively differing in specific surface area may be positioned so that the plasma can be generated with priority at the center of the exhaust gas flow path. Or, electrodes respectively differing in specific surface areamaybepositioned so that the exhaust gas flows uniformly inside the exhaust gas flow path.
  • the present invention is not limited to this configuration. That is, the electrode configuration may be constituted of three or more regions having different specific surface areas and, for example, a structure, with which the specific surface area increases in multiple steps from the upstream side to the downstream side, may be employed.
  • a 600Hz boosted secondary voltage of 2 to 6kV was applied to each electrode and the light emission luminance upon light emission due to plasma generation was measured.
  • the power supply for plasma generation is configured of the two stages of a primary power supply boosting up to 500V DC and a pulse power supply boosting up to 10kV.
  • Test results are shown in a graph in FIG. 5 . As shown in this figure, it was found that the lower the specific surface area, in other words, the larger the pore diameter, the higher the light emission luminance of the plasma. It was found that the radiation luminance by plasma is especially high with #5 and #8, with which the specific surface area is no more than 1000m2/m3.
  • the porous electrodes tested in the plasma radiation luminance measurement test were subject to a mode evaluation using a dynamometer.
  • the respective PM removal rates in cases of employing the respective electrodes were measured.
  • the high-voltage pulse power supply set to a 600Hz primary voltage of 400V was used to apply a 600Hz boosted secondary voltage of 8kV to each electrode, and the PM removal rate during plasma generation (plasma on) and the PM removal rate when the voltage was not applied (plasma off) were measured respectively.
  • each arrow schematically indicates a difference between voltage application and non-application states for the same electrode.
  • the PM becomes more readily trapped and the PM removal rate thus tends to increase as the specific surface area increases.
  • the difference of PM removal rate due to current application in each electrode is higher the lower the specific surface area, in other words, the higher the light emission luminance in the plasma radiation luminance measurement test.
  • the porous electrode according to FIG. 2 employed as the low specific surface area region in the embodiment described above and a metal plate having the same configuration as the metal plate A1 shown in FIG. 3 employed in the modification example of the embodiment (referred to hereinafter and in the drawing as the "wave foil electrode") were tested.
  • the wave foil electrode is made to have openings with a diameter of approximately 5mm.
  • a 600Hz boosted secondary voltage of 2 to 6kV was applied to each electrode and the light emission luminance upon light emission due to plasma generation was measured.
  • Plasma light emissions by the respective electrodes are shown in photographs in FIG. 7 .
  • the porous electrode (#5) indicated a relative value of 58.1
  • Plasma radiation luminance of three types of electrodes were measured.
  • the high-voltage pulse power supply set to a 200Hz primary voltage of 400V was used to apply a 200Hz boosted secondary voltage of 8kV to each electrode, and the PM removal rate in the state of plasma generation and the maximum exhaust pressure at the respective electrodes during the mode tests were measured respectively.
  • the test results are shown in graphs in FIG. 8 .
  • the multi-stage electrode according to the present invention indicated a high removal rate similar to that of #12.
  • FIG. 8B it was found that the multi-stage electrode according to the present invention, although exhibiting a maximum exhaust pressure higher than #5, exhibits a significantly lower maximum exhaust pressure in comparison to #12 that exhibits practically the same PM removal rate.
  • the plasma reactor electrode according to the present invention is used in an apparatus, etc., for removing components contained in a smoke exhaust discharged from a factory, plant, internal combustion engine, etc., and having an adverse effect on an environment.
EP07744142A 2006-05-26 2007-05-25 Plasmareaktorelektrode Withdrawn EP2022953A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006147487 2006-05-26
PCT/JP2007/060708 WO2007139019A1 (ja) 2006-05-26 2007-05-25 プラズマ反応器用電極

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EP2022953A1 true EP2022953A1 (de) 2009-02-11

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JP (1) JPWO2007139019A1 (de)
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