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WO2016056254A1 - Dispositif de précipitation électrique - Google Patents

Dispositif de précipitation électrique Download PDF

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Publication number
WO2016056254A1
WO2016056254A1 PCT/JP2015/053230 JP2015053230W WO2016056254A1 WO 2016056254 A1 WO2016056254 A1 WO 2016056254A1 JP 2015053230 W JP2015053230 W JP 2015053230W WO 2016056254 A1 WO2016056254 A1 WO 2016056254A1
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WIPO (PCT)
Prior art keywords
plate
discharge
electrode
dust collection
dust
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.)
Ceased
Application number
PCT/JP2015/053230
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English (en)
Japanese (ja)
Inventor
上田　泰稔
真之 永田
哲史 陵本
理 吉住
西山　徹
士朗 鈴木
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Mitsubishi Power Environmental Solutions Ltd
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Mitsubishi Hitachi Power Systems Environmental Solutions Ltd
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Publication of WO2016056254A1 publication Critical patent/WO2016056254A1/fr
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Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/025—Combinations of electrostatic separators, e.g. in parallel or in series, stacked separators or dry-wet separator combinations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/09—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces at right angles to the gas stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/36—Controlling flow of gases or vapour
    • B03C3/361—Controlling flow of gases or vapour by static mechanical means, e.g. deflector
    • B03C3/366—Controlling flow of gases or vapour by static mechanical means, e.g. deflector located in the filter, e.g. special shape of the electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/51—Catch- space electrodes, e.g. slotted-box form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/06—Ionising electrode being a needle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/10—Ionising electrode with two or more serrated ends or sides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/14—Details of magnetic or electrostatic separation the gas being moved electro-kinetically

Definitions

  • the present invention relates to an electrostatic precipitator including a discharge electrode that performs corona discharge and a dust collection electrode that is disposed to face the discharge electrode.
  • the electrostatic precipitator removes dust particles (also called dust, particulate matter, etc.) contained in the exhaust gas or air before releasing them from the chimney to the atmosphere.
  • the electric dust collector includes a discharge electrode, a dust collection electrode disposed opposite to the discharge electrode, etc., and generates a corona discharge between the two electrodes by applying a high voltage to the discharge electrode so that exhaust gas etc. The particles contained in are charged. The charged particles are attracted to the dust collecting electrode by the electric field formed between both electrodes, and are collected on the electrode plate.
  • the dust collection electrode of the electric dust collector is a plate-like member and is generally installed in parallel to the gas flow.
  • it is necessary to increase the area of the dust collection electrode.
  • it is necessary to increase the length in the depth direction, and the apparatus size in the gas flow direction becomes large. In that case, structural design difficulties arise, and equipment placement difficulties due to an increase in installation area occur.
  • a breathable plate (hereinafter referred to as a “breathable member”) with uniform gap distribution over the entire surface, such as a metal mesh or punching metal, is installed in a direction perpendicular to the gas flow to collect dust.
  • a breathable member sometimes used as a pole to collect dust.
  • the air-permeable member has a gap in the corona discharge range of the discharge electrode that can charge the particles most efficiently, the charged particles may slip through and the collection efficiency may be reduced.
  • a plate-like member (hereinafter referred to as “plate-like member”) of a dust collecting electrode without air permeability may be installed in a direction substantially orthogonal to the gas flow.
  • the apparatus size in the gas flow direction can be shortened.
  • the following discharge event occurs. That is, if the dust collection area is increased in order to improve the collection efficiency, the opening is narrowed and the gas flow rate is increased. As a result, the amount of dust passing through the gas increases and the pressure loss increases.
  • the present invention has been made in view of such circumstances, and it is possible to improve the collection efficiency when the plate-like member of the dust collection electrode is installed in a direction substantially orthogonal to the gas flow.
  • An object of the present invention is to provide a simple electric dust collector.
  • the electrostatic precipitator according to the first aspect of the present invention has a protruding discharge thorn, a discharge electrode for performing corona discharge, and a plate-like member having no air permeability, and is installed facing the discharge thorn. And the plate surface of the plate-like member of the dust collection electrode is disposed substantially orthogonal to the gas flow flowing toward the dust collection electrode, and the discharge electrode is the dust collection electrode.
  • the discharge electrode having the protruding discharge thorn performs corona discharge, and the particles included in the gas flow are collected by the dust collection electrode having the plate-like member.
  • the plate-like member does not have air permeability, it is difficult for particles to re-scatter, and the plate-like member is disposed almost orthogonal to the gas flow flowing toward the dust collecting electrode.
  • the size can be shortened.
  • the aperture ratio represented by a / (a + W) is in the range of 10% to 50%, the collection efficiency is high.
  • the width W of the plate-like member is 1.0 d which is equal to the distance d between the tip of the discharge spike and the plate-like member, a result is obtained that the optimum value covers the range affected by the corona discharge. Therefore, by setting the upper limit value of the width W of the plate-shaped member to 2.0d, it is possible to prevent the current density from being excessively lowered, and by setting the lower limit value of the width W of the plate-shaped member to 0.5d, The collection efficiency can be increased without increasing the number of members 7 installed.
  • the width W of the plate-like member is 1.0 d which is equal to the distance d between the tip of the discharge spike and the plate-like member, a result is obtained that the optimum value covers the range affected by the corona discharge. Therefore, by setting the upper limit value of the width W of the plate-like member to 2.0 d, it is possible to prevent the current density from being excessively lowered, and by setting the lower limit value of the width W of the plate-like member to 0.3 d, corona discharge The collection efficiency can be increased without causing too much interference in the generation area.
  • the 2nd discharge electrode installed in the downstream of a gas flow with respect to the said dust collection electrode is further provided,
  • the said 2nd discharge electrode is the plate-shaped member of the said dust collection electrode.
  • the gas discharge part may be provided at a position where discharge is performed on the downstream surface, or the second discharge electrode is formed between two adjacent plate-like members installed in the same plane. It may be provided on the extension of.
  • the 2nd dust collection electrode further installed in the downstream of a gas flow with respect to the said dust collection electrode,
  • the said 2nd dust collection electrode is installed in the same plane. You may provide on the extension of the gas passage part formed between the two said plate-shaped members adjacent to a dust collection electrode.
  • WHEREIN You may further provide the partition plate which plugs up the clearance gap between the said plate-shaped member of the said dust collection electrode, and the inner surface of a casing.
  • the said plate-shaped member of the said dust collection electrode may be arrange
  • the collection efficiency when the plate-like member of the dust collection electrode is installed in a direction substantially perpendicular to the gas flow, the collection efficiency can be improved.
  • the electric dust collector according to the present embodiment is installed in an exhaust gas treatment facility provided in a flue on the downstream side of an industrial combustion facility such as a coal-fired or heavy oil-fired power plant or an incinerator, for example.
  • an industrial combustion facility such as a coal-fired or heavy oil-fired power plant or an incinerator, for example.
  • the electrostatic precipitator can also be used for air purification equipment filters (for example, clean room air conditioning filters, virus removal filters, etc.).
  • air purification equipment filters for example, clean room air conditioning filters, virus removal filters, etc.
  • the electrostatic precipitator 1 includes a discharge electrode 2 that charges particles to remove particles such as dust and mist, and a dust collection electrode that is disposed to face the discharge electrode 2. 3 etc.
  • the discharge electrode 2 and the dust collection electrode 3 are installed in the casing 4. Note that the electric dust collector 1 shown in FIGS. 1 to 4 is schematically shown, and the sizes and the number of installed discharge electrodes 2 and dust collection electrodes 3 are not limited to the illustrated example.
  • the discharge electrode 2 has a mounting material 5 and a discharge thorn 6.
  • the discharge thorn 6 is installed on the attachment material 5 and protrudes in the direction from the attachment material 5 toward the dust collection electrode 3.
  • the tip direction represents the tip direction of the discharge thorn 6.
  • the discharge thorn 6 is installed on the upstream side of the gas flow with respect to the dust collection electrode 3.
  • the discharge thorns 6 may be provided on both surfaces of the dust collection electrode 3. It is done.
  • the axial direction of the mounting material 5 is perpendicular to the gas flow at the inlet of the electrostatic precipitator 1.
  • the gas flow of the electric dust collector 1 which concerns on this embodiment is a perpendicular
  • this invention is not limited to this example, It can apply also to the electrostatic precipitator in which the gas flow was parallel or inclined with respect to the gravity direction, and is not influenced by the gas flow direction.
  • the dust collection electrode 3 has a plate-like member 7 formed of a metal plate or the like, and is installed facing the discharge electrode 2.
  • the plate-like member 7 of the dust collection electrode 3 is a plate having no air permeability on the plate surface and having conductivity, for example, a metal plate.
  • the plate surface of the plate-like member 7 of the dust collection electrode 3 is arranged substantially orthogonal to the gas flow flowing toward the dust collection electrode 3. Further, the discharge barb 6 of the discharge electrode 2 is placed opposite to the plate member 7 so that the influence range of the corona discharge is appropriately distributed in the plate member 7 of the dust collection electrode 3. For example, when there is one discharge thorn 6 in the width direction of the plate-like member 7, the discharge thorn 6 is arranged at the center in the width direction of the plate-like member 7.
  • the discharge electrode 2 and the dust collection electrode 3 are separated from each other and electrically insulated.
  • the discharge electrode 2 is connected to a high voltage power source (not shown).
  • a high voltage is applied to the discharge electrode 2
  • corona discharge occurs at the discharge electrode 2.
  • the particles contained in the exhaust gas or the air are charged by the corona discharge, and the charged particles are attracted to the dust collection electrode 3 by the Coulomb force and collected on the plate-like member 7 which is an electrode plate.
  • the electric dust collector 1 is provided with a striking device (not shown) for peeling particles adhering to the dust collecting electrode 3.
  • the hammering device has a hammer. When the hammer strikes the dust collecting electrode 3, particles attached to the surface are peeled and removed by vibration.
  • the removal method from the plate-shaped member 7 of the dust collection electrode 3 of particles is not limited to the strike using a strike device.
  • the particles may be removed from the plate-like member 7 by a method of blowing a gas to the particles collected on the plate-like member 7 or a method of irradiating a sound wave using a sonic horn. Further, the particles may be removed from the plate-like member 7 by cleaning with a cleaning liquid as is performed in a wet electrostatic precipitator.
  • a hopper 8 is attached to the lower part of the casing 4.
  • the hopper 8 receives particles separated from the dust collection electrode 3 of the electric dust collector 1 by hitting.
  • the hopper 8 is provided with a particle discharging device (not shown) for discharging the accumulated particles.
  • the plate-like member 7 of the dust collecting electrode 3 is a long member having a rectangular shape in front view.
  • the plate member 7 is, for example, a flat plate having no bent portion in the cross-sectional shape as shown in FIG.
  • the plate-like member 7 is a plate without air permeability.
  • the plate-like member 7 has higher mechanical strength than a gas-permeable member such as a wire mesh or punching metal.
  • a gas-permeable member such as a wire mesh or punching metal.
  • durability can be improved even when hitting or vibrating the plate-like member 7.
  • the plate-like member 7 is not clogged under a condition where the particle concentration is high, so that the performance with time does not deteriorate.
  • the manufacturing cost of the plate-like member 7 can also be reduced as compared with a breathable member such as a wire mesh.
  • the plate-like member 7 of the dust collecting electrode 3 has a width and a height that are within the range affected by the corona discharge generated in front of the discharge thorn 6. That is, as shown in FIG. 3, since there is no gas passage 9 between the two plate-like members 7 within the range of corona discharge, there is little slipping of charged particles and less re-scattering.
  • the dotted line in FIG. 3 schematically shows the range of influence of corona discharge.
  • a plurality of plate-like members 7 of the dust collecting electrode 3 are arranged in parallel so as to be within the same plane, and an opening portion through which gas passes between the two plate-like members 7, that is, a gas circulation portion 9. Is formed.
  • the shape of the gas passage portion 9 is a rectangle when the shape of the plate-like member 7 when viewed from the front is a rectangle.
  • the plate-like member 7 is arranged in a plurality of stages from the upstream side to the downstream side of the gas flow. As shown in FIG. 2, the plate member 7 on the upstream side, that is, the plate member 7 on the upstream side is arranged so that the entire surface overlaps in front view. Thereby, since the gas passage part 9 becomes the same position over several steps, it can suppress the raise of a pressure loss.
  • the discharge electrode 2 is installed on the dust collection electrode 3.
  • the discharge electrode 2 is installed on the upstream side of the gas flow, and the upstream side of the plate-like member 7 provided on the downstream side. It is essential to discharge the discharge thorn 6 toward the surface. This is because the discharge thorn 6 is not discharged toward the upstream side surface of the plate-like member 7 provided on the downstream side, and the discharge thorn 6 is applied only to the downstream side surface of the plate-like member 7 provided on the upstream side. This is because the particle collection efficiency is extremely low in the case of discharging toward the surface.
  • the single-sided discharge that discharges toward the upstream surface of the plate member 7 is performed in two stages in the gas flow direction, and the upstream of the plate member 7 as shown in FIG.
  • the collection efficiency was the same. That is, if the particles are already charged on the upstream side of the plate-like member 7, it is possible to effectively collect the particles by performing discharge toward the downstream surface of the plate-like member 7. .
  • the number of stages of the dust collection electrode 3 is reduced when the double-sided discharge is installed in a plurality of stages rather than the case where the single-sided discharge is installed in a plurality of stages. Particles can be collected without taking up much space and without reducing the collection efficiency. For example, the collection efficiency when the single-sided discharge is performed in four stages and the double-sided discharge is performed in two stages is substantially the same.
  • the discharge electrode 2 can also be installed facing both the upstream and downstream sides of the discharge electrode 2. That is, the discharge directed to both the downstream surface of the first-stage plate member 7 and the upstream surface of the second-stage plate member 7 can be executed from one discharge electrode 2.
  • the present invention is not limited to this example, and a plurality of plate-like members 7 may be arranged in a staggered manner as shown in FIGS. 6 and 7. That is, the plate member 7 on the upstream side, that is, the plate member 7 on the upstream side with respect to the plate member 7 on the upstream side may be arranged at a position corresponding to the substantially central portion of the gas passage portion 9 on the front stage side in a front view.
  • the pressure loss increases, the particles that have passed through the gas passage 9 can be easily guided to the influence range of the corona discharge by the discharge electrode 2 in the next stage.
  • the discharge electrode 2 is disposed so as to face the discharge thorn 6 so as to be substantially at the center in the width direction of the plate-like member 7 of the dust collection electrode 3.
  • the present invention is not limited to this example.
  • the discharge electrode 2 when performing discharge toward the downstream surface of the plate-like member 7, the discharge electrode 2 may be provided also in the central portion of the gas passage portion 9. This makes it possible to collect dust that has passed through the dust collection electrode 3 and improve the collection efficiency.
  • the distance a between the two plate-like members 7 of the dust collecting electrode 3 and the distance d between the discharge thorn 6 and the plate-like member 7 will be described later.
  • FIG. 8 is a graph showing the relationship between the collection coefficient ratio and the operation time
  • FIG. 9 is a graph showing the relationship between the pressure loss ratio and the operation time.
  • the pressure loss increases with an increase in the operation time, and slipping due to particles passing through the wire mesh occurs, and the distance between the wire mesh and the dust is short, so re-scattering increases. As a result, the collection efficiency decreases.
  • the present Example using the plate-shaped member of a metal plate it can drive
  • the distance d between the tip of the discharge barb 6 of the discharge electrode 2 and the plate-like member 7 of the dust collection electrode 3 is 130 mm
  • the distance L between two adjacent discharge barbs 6 is as follows.
  • the current is relatively strong, and the region where the particles adhere densely is a substantially circular region having a diameter of about 130 mm. From this, the influence of the adjacent discharge thorns 6 cannot be ignored.
  • the diameter is approximately equal to the distance d between the tip of the discharge thorns 6 and the plate member 7. It can be said that this indicates that the circular region as described above may be considered as a range affected by corona discharge.
  • the test results show that the maximum value of the collection efficiency is in the range where the aperture ratio is 20% or more and 35% or less.
  • the aperture ratio was about 10%, it was predicted that the collection efficiency would be maximized, but actually, the maximum value was obtained with an aperture ratio larger than expected.
  • the desirable aperture ratio is assumed to be in the range of 10% to 50%. Thereby, it can collect in the state where collection efficiency is high. This is expressed as follows. 0.1 ⁇ a / (a + W) ⁇ 0.5 (Formula 1)
  • FIG. 13 shows the current density on the dust collecting electrode 3 and the position (the width (W) of the plate-like member 7 and the discharge thorn 6 and the plate-like member 7) from the position directly below (0 point) on the discharge piece 6 on the plate-like member 7. It is a graph which shows a relationship with ratio (W / d) between distance (d) between.
  • the width W is 1.0 d
  • the width W is an optimal value that covers the range affected by the corona discharge.
  • the upper limit value of the width W is set to 2.0d so that the current density does not decrease too much
  • the lower limit value of the width W is set to 0.5d in consideration of the number of the plate-like members 7 installed. This is expressed as follows. 0.5d ⁇ W ⁇ 2.0d (Formula 2)
  • Equation 1 above can be expressed as 10 / 9W ⁇ L ⁇ 2.0W (Formula 6) And considering equation 2, 5 / 9d ⁇ L ⁇ 4.0d (Formula 7) The relationship holds.
  • FIG. 14 shows an average current density ratio or a collection coefficient ratio on the dust collecting electrode 3, a distance (H) in the height direction of the discharge thorn 6, and a distance (d) between the discharge thorn 6 and the plate-like member 7. It is a graph which shows the relationship with ratio (H / d). Regarding the interval H, a circular region having a diameter that is approximately equal to the distance d between the tip of the discharge thorn 6 and the plate-like member 7 may be considered as a corona discharge generation area. The optimum value is 1.0 d, similar to the optimum value of the width W described above.
  • the upper limit value of the interval H is set to 2.0 d so that the collection efficiency does not decrease too much and the current density on the plate-like member 7 does not decrease too much so that the corona discharge generation area does not interfere too much.
  • the lower limit value of the interval H is 0.3d. This is expressed as follows. 0.3d ⁇ H ⁇ 2.0d (Formula 8)
  • FIG. 12 is a graph showing the relationship between the collection coefficient ratio and the aperture ratio. According to the experimental results, the collection efficiency is almost the maximum when the aperture ratio is in the range of 25% or more and 30% or less, and the collection efficiency is lowered even if the aperture ratio is larger or smaller than this range. In particular, when the aperture ratio is less than 10% or exceeds 50%, the collection efficiency is less than 85%, and the collection cannot be performed efficiently.
  • the plate surface of the plate-like member 7 of the dust collection electrode 3 is disposed substantially orthogonal to the gas flow flowing toward the dust collection electrode 3.
  • the collection efficiency is almost the maximum when the aperture ratio is in the range of 25% to 30%, and the aperture ratio is larger or smaller than this range. It is estimated that the result that the collection efficiency decreases was obtained.
  • the experiment was to confirm how the dust collection area per unit gas amount and the aperture ratio, that is, the passing gas flow velocity at the opening, affect the collection efficiency.
  • As parameters (1) aperture ratio, (2) number of electrode stages, (3) gas amount, and (4) electrode shape (rectangular, circular, etc.) were set. In order to determine an appropriate aperture ratio range, the contribution of each parameter to the collection efficiency was evaluated.
  • FIG. 13 shows the current density distribution ratio on the dust collecting electrode 3 and the position from the position directly below (0 point) the discharge barb 6 on the plate member 7 (the width (W) of the bar plate member 7 and the discharge barb 6 and the plate bar). It is a graph which shows the relationship with the ratio (W / d) with the distance (d) between the members 7). According to this graph, it can be seen that the current density becomes maximum at a position directly below the discharge thorn 6 and decreases as it goes to the end side of the plate-like member 7.
  • the current density is about 1/5 of the maximum value at the position of + d or -d immediately below the discharge thorn 6 (0 point).
  • the current density is almost zero at a position + 2d or ⁇ 2d immediately below the discharge thorn 6 (0 point). Therefore, since it is necessary to secure a current for suppressing re-scattering of particles, the upper limit of the width W of the plate-like member 7 is 2d.
  • the width W of the plate-like member 7 is reduced with respect to the distance d between the discharge thorn 6 and the plate-like member 7, the number of the plate-like members 7 installed increases.
  • the number of installations is large, it becomes difficult to maintain the installation accuracy of the discharge electrode 2 and the dust collection electrode 3 at a predetermined level or more. Therefore, it is reasonable to set the lower limit of the width W of the plate-like member 7 to 0.5d.
  • FIG. 14 shows an average current density ratio or a collection coefficient ratio on the dust collecting electrode 3, a distance (H) in the height direction of the discharge thorn 6, and a distance (d) between the discharge thorn 6 and the plate-like member 7. It is a graph which shows the relationship with ratio (H / d).
  • the change in the collection coefficient ratio was small even when the average current density was changed.
  • the distance (H) in the height direction of the discharge thorn 6 and the ratio (H / d) of the distance (d) between the discharge thorn 6 and the plate-like member 7 are set in the range of 0.3 to 2.0.
  • the front view shape of the plate member 7 is rectangular, but as shown in FIG. 15, the front view shape of the plate member 7 may be circular.
  • the discharge electrodes 2 are installed at equal intervals in the vertical direction and the horizontal direction on the plane.
  • the arrangement relationship between the discharge barb 6 of the discharge electrode 2 and the plate-like member 7 of the dust collection electrode 3 is the same as when the plate-like member 7 has a rectangular shape when viewed from the front.
  • the width W of the plate-like member 7 in the above description is read as the diameter W of the circular portion of the plate-like member 7 when the shape of the plate-like member 7 when viewed from the front is circular.
  • the plate-like member 7 may have a shape like a grooved steel having a bent portion near the end in the cross-sectional shape. Further, as shown in FIG. 17, the plate-like member 7 may have a shape curved in the width direction (for example, a letter shape of a cross section U). By having such a shape, the plate-like member 7 can improve the strength as compared with the case where it is a flat plate having no bent portion. In particular, in the case of the large-sized electrostatic precipitator 1, the length of the plate-like member 7 is increased, which is advantageous. Moreover, the re-scattering of the collected particle
  • the arrangement relationship between the discharge electrode 2 and the dust collection electrode 3 described above is also the case where the plurality of plate-like members 7 and the shielding plate 10 are arranged in a U-shaped cross section in the casing 4 of the electric dust collector 1. Applicable.
  • the plate surface of the plate-like member 7 is parallel to the gas inflow direction and the outflow direction of the inlet portion and the outlet portion of the casing 4 of the apparatus.
  • the gas passage portion 9 is formed between two adjacent plate-like members 7, the gas flow flowing toward the dust collection electrode 3 is substantially orthogonal to the plate surface of the plate-like member 7. It will be.
  • the plate surface of the plate-like member 7 is not dust-collected. It is arranged substantially orthogonal to the gas flow flowing toward the electrode 3.
  • the discharge electrode 2 When the plurality of plate-like members 7 and the blocking plates 10 are arranged in the casing 4 of the electric dust collector 1 so as to have a U-shaped cross-section, the discharge electrode 2 has two plate-like members facing each other. 7, the discharge thorn 6 is provided toward both plate-like members 7. Although only the discharge from the upstream side is shown in the figure, it is possible to improve the performance by installing the discharge electrode 2 toward the plate member 7 on the downstream side of the gas flow and discharging from the downstream side. It is.
  • the plate member 7 of the dust collecting electrode 3 has a longitudinal direction parallel to the vertical direction.
  • the plate-like member 7 is desirably arranged as follows.
  • the partition plate 12 is installed in By installing the partition plate 12 on the upstream side of the gas flow, it becomes possible to suppress slipping of a gas containing uncharged particles, and to reduce particles that are not collected.
  • the electric dust collector 1 according to the present embodiment is not only installed alone, but can be combined with other types of dust collectors or integrated with other types of dust collectors.

Landscapes

  • Electrostatic Separation (AREA)

Abstract

L'invention a pour objet de fournir un dispositif de précipitation électrique qui lorsqu'un élément plat d'une électrode collectrice, est disposé dans une direction sensiblement parallèle à un écoulement de gaz, permet d'améliorer une efficacité de collecte. Le dispositif de précipitation électrique est équipé : d'une électrode de décharge (2) qui possède une pointe de décharge (6) en forme de saillie, et qui effectue une décharge par effet couronne; et de l'électrode collectrice (3) qui possède l'élément plat (7) non perméable à l'air, et qui est disposée en vis-à-vis avec la pointe de décharge (6). Une face plane de l'élément plat (7) de l'électrode collectrice (3), est disposée presque perpendiculairement à l'écoulement de gaz s'écoulant vers l'électrode collectrice (3). L'électrode de décharge (2) est disposée côté amont de l'écoulement de gaz par rapport à l'électrode collectrice (3), et effectue une décharge au niveau de la face côté amont de l'élément plat (7) de l'électrode collectrice (3), et lorsque la distance entre les parties extrémité entre deux éléments plat (7) adjacents disposés à l'intérieur d'un même plan, est représentée par a, et que la largeur de l'élément plat est représentée par W, alors la relation 0,1≤a/(a+W)≤0,5 est satisfaite.
PCT/JP2015/053230 2014-10-08 2015-02-05 Dispositif de précipitation électrique Ceased WO2016056254A1 (fr)

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JP2014-207400 2014-10-08
JP2014207400A JP6333697B2 (ja) 2014-10-08 2014-10-08 電気集じん装置

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EP3815791A4 (fr) * 2018-08-01 2021-07-07 Mitsubishi Power Environmental Solutions, Ltd. Électrofiltre

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JP6827864B2 (ja) * 2017-03-24 2021-02-10 三菱重工業株式会社 凝集装置及びこれを備えた排ガス処理装置
JP7109194B2 (ja) * 2018-01-15 2022-07-29 三菱重工パワー環境ソリューション株式会社 電気集塵装置
JP7139120B2 (ja) * 2018-01-18 2022-09-20 三菱重工パワー環境ソリューション株式会社 電気集塵装置
WO2020204546A1 (fr) 2019-04-02 2020-10-08 삼성전자주식회사 Dispositif de charge et appareil de collecte de poussière
JP7225019B2 (ja) * 2019-04-24 2023-02-20 三菱重工パワー環境ソリューション株式会社 電気集塵装置

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