JP3033953B2 - Electric dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric precipitator for purifying air containing dust in an automobile road tunnel.

[0002]

2. Description of the Related Art Air in a tunnel on a motorway is contaminated with a large amount of suspended particulates such as soot discharged from a vehicle and dust generated by abrasion of asphalt pavement due to running of the vehicle. In such contaminated air, concrete particles generated by scraping with spiked tires and viscous particles in which antifreezing agents such as calcium chloride are combined are brought into the tunnel, and during the traveling, It is soared and stirred by a car, and sticky suspended particulates are also mixed. In this way, non-sticky fine particles and sticky fine particles are mixed in the air in the tunnel, and in order to purify such contaminated air in the tunnel, the air in the tunnel is sucked, An electrostatic precipitator is used in which dust particles in the air are charged by corona discharge, and then the charged dust particles are electrically adsorbed by Coulomb force.

[0003] As described above, this electrostatic precipitator includes a charging electrode for charging dust particles in the air by corona discharge, and a dust collecting electrode for electrically adsorbing dust particles charged by corona discharge. Electrodes. Since the non-adhesive fine particles and the sticky fine particles are electrically adsorbed and adhere to the dust collecting electrode, the electric dust collecting device is cleaned by blowing air or water to the electrode to clean the electrode. A device is provided.

A typical prior art is, for example,
No. 3-52540. In this conventional technique, a plurality of air blow nozzles are provided on the downstream side in the flow direction of the contaminated air of the dust collecting unit including the dust collecting electrodes to inject air toward the gap between the respective dust collecting electrodes. Pressurized air is supplied to each air blow nozzle from a compressor via an air blow line, and air is blown from the air blow nozzle toward the interlayer gap of each dust collecting electrode at a speed close to the speed of sound, and adheres to each dust collecting electrode. It is configured to be able to wipe off the attached matter.

Another conventional technique disclosed in Japanese Patent Publication No. 6-85891 discloses the above-mentioned Japanese Patent Publication No. Sho 63-52540.
In the prior art disclosed in Japanese Patent Application Laid-Open No. H10-209, it is considered that a water cleaning method is effective because air-blowing cannot completely remove sticky substances adhering to the dust collecting electrode. Approximately 3 from the dust collection section cleaning nozzle between the dust electrodes
The washing water is diffused in a cone shape and sprayed at a water pressure of kg / cm ² to remove deposits on the electrode for collecting dust, and then air is sprayed at an air pressure of about 2 kg / cm ² from the washing nozzle of the dust collecting section. ,
It is configured such that water droplets attached to the dust collecting electrode can be removed to shorten the drying time of the dust collecting electrode.

[0006] Further, in another conventional technique disclosed in Japanese Patent Publication No. 6-49154, the aforementioned Japanese Patent Publication No. 63-525 is disclosed.
As in the prior art disclosed in Japanese Patent No. 40, water is sprayed from a dust collecting portion cleaning nozzle to a dust collecting electrode at a water pressure of about 3 kg / cm ² against an adhesive substance that cannot be completely removed by air blow. After removing adhering substances, air is sprayed instead of the water from the dust collecting part cleaning nozzle to remove water droplets adhering to the dust collecting electrode, thereby shortening a drying time after water cleaning. It is configured as follows.

The above-mentioned JP-B-63-52540, JP-B-6-85891, and JP-B-6-4915.
In each of the conventional techniques disclosed in Japanese Patent Application Laid-Open No. 4 (1999) -1999, there is a case where it is not possible to sufficiently remove the adhered substance having a high adhesive force of the dust collecting electrode. Has a problem that the cleaning time with air or water becomes long. In each of the conventional techniques disclosed in Japanese Patent Publication No. 6-85891 and Japanese Patent Publication No. 6-49154, high-pressure water is sprayed to the dust collecting electrode to remove the water. Air is blown to the dust collecting electrode in order to remove water attached to the dust electrode and to dry the dust collecting electrode, and the blower or the compressor must be operated for a long time. Therefore, there is a problem that the power consumption for driving such a blower or a compressor becomes large, and the economy is low.

[0008] Regarding the removal of deposits on the dust collecting electrode which adheres with a strong adhesive force, which is a problem in the above three prior arts, as disclosed in, for example, JP-A-55-167075, A technique of spraying fine particles or dry ice particles or mixed particles formed by mixing ice fine particles and dry ice particles on a surface to be cleaned to remove deposits is well-known, particularly when dry ice particles are used, Since the dry ice particles sublime in a shorter time than the ice particles and water, the drying time can be omitted, the cleaning time can be reduced, and the power consumption for drying can be reduced. Economy can be improved as compared with the conventional technology.

Another conventional technique similar to the conventional technique disclosed in Japanese Patent Application Laid-Open No. 55-167075 is as follows.
For example, JP-A-2-297816 and Japanese Patent Publication No.
-51233. In any of these conventional techniques, it is possible to cause particles of a sublimate such as dry ice to collide with the surface to be cleaned, and remove the adhered substance with a strong adhesive force.

[0010]

SUMMARY OF THE INVENTION The above-mentioned JP-A-55-1
The prior art disclosed in Japanese Patent No. 67075 discloses a technique for removing stains on the surface of road or railroad facilities, for example, a facility such as a tunnel wall or a guardrail, a bridge or the like, or a building or the like which requires regular cleaning, or repairing the facility. Technology for removing rust or paint. Further, the prior art disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 2-297816 removes deposits on the surface of the contact piece of an electric device member or debris such as burrs and molding powder on an electric device member made of a resin molded product. Cleaning method. Further, the conventional technique disclosed in Japanese Patent Publication No. 4-51233 is
The present invention relates to a cleaning method for removing resin deposits adhering to an apparatus for crushing resin raw materials at a low temperature. Therefore, in the field of the electrostatic precipitator, there is no technique for removing the adhering substance that adheres to the electrode with a strong adhesive force.

An object of the present invention is to provide an electric precipitator capable of reliably and quickly removing an adhering substance adhering to an electrode with a strong adhering force.

[0012]

According to a first aspect of the present invention, there is provided a dust collector having a plurality of flat plate-shaped electrodes which are arranged in parallel at intervals of about 5 to 10 mm. A cleaning unit that injects dry ice particles having a particle size of about 1 to 2 mm toward a space between the nozzles at a predetermined injection speed from a nozzle to impinge on opposing surfaces of the electrodes is provided, and the cleaning unit includes the cleaning unit, The nozzle is separated from a virtual one side surface including the respective end surfaces of the side edges of the respective electrodes of the dust collector body in a horizontal direction parallel to the thickness direction of each electrode and at a distance from the virtual one side surface with respect to this horizontal direction. An electric precipitator, comprising a moving means for vertically moving the dust collector above.

According to the present invention, the electric precipitator has a plurality of flat plate-shaped electrodes arranged in parallel at intervals of about 5 to 10 mm. Dry ice particles are ejected from the nozzle toward the space between the electrodes. This injection speed is selected as a predetermined injection speed according to the length of each electrode present in the injection direction. That is, a constant jetting speed is selected that can remove the deposits adhering to the entire region extending from the nozzle to the deepest portion of each electrode. Since the dry ice particles have a distance between each electrode of about 5 to 10 mm, the diameter of the dry ice particles is preferably about 1 to 2 mm. If the particle size is less than about 1 mm, most of the dry ice particles will sublime before colliding with the opposing surface of each electrode, making it impossible to clean the entire surface of the electrode. At the same time, it is impossible to remove the adhered substance having a strong adhesive force. Further, when the particle size exceeds about 2 mm, the thickness of each electrode is about 0.5 mm, so that the mass of the dry ice particles is large, so that the collision energy to the surface of the electrode becomes excessive and the electrode is damaged. The problem arises. A charging electrode is provided on the dust collecting electrode on the upstream side in the direction of flow of the dust-containing gas, and the charging electrode has a configuration in which a linear or projecting discharge electrode is arranged between a flat ground electrode. Therefore, when the dry ice particles collide with the discharge electrode with a large collision energy, the discharge electrode may be broken. Therefore, the particle size of the dry ice particles is about 1 to
2 mm is preferred.

By providing such a cleaning means in the electrostatic precipitator, it is possible to reliably remove the adhered substances adhered to the surface of each electrode with a strong adhesive force and over the entire surface. The cleaning time for injecting the particles is short. In addition, since the dry ice particles sublime at room temperature, a drying step is not required unlike water washing, and the washing time can be reduced. Furthermore, since the dry ice particles sublime at room temperature, there is no residue on the surface of each sprayed electrode, so no new deposits are generated with the residue as a nucleus, and the particles are washed with a solvent. In this case, there is no problem that the adhered substance is re-attached after the cleaning as in the case where the cleaning is performed.

The cleaning means includes a moving means for moving the nozzle in the horizontal and vertical directions. This moving means includes one virtual side surface commonly including each end surface of the side edge portion of each electrode,
For example, at a distance from one side on the downstream side in the direction of the flow of the gas containing dust, the nozzle is placed on the virtual one side in a horizontal direction parallel to the thickness direction of each electrode and a vertical direction perpendicular to the horizontal direction. And can be moved to.

The nozzle moved by such a moving means is spaced apart from the virtual one side surface by an interval,
This prevents the nozzle orifice from being clogged by the end face of each electrode, prevents damage to the end face of each electrode and clogs the nozzle, and enables the continuous flow of dry ice particles from the nozzle. Can be injected. If there is no gap between the nozzle and the end face of each electrode, the dry ice particles ejected from the nozzle collide with the surface near the end face of the electrode and are reflected in a direction perpendicular to the surface and toward the near side, Dry ice particles may accumulate in the space between the electrodes, and the space may be closed. It is preferable that the interval is appropriately determined according to the injection amount, the injection direction and the injection speed of the dry ice particles from the nozzle, and the interval between the electrodes so that such a problem does not occur. By such a moving means, it is possible to wash over a wide area while continuously spraying dry ice particles from one or a plurality of nozzles, whereby the number of nozzles can be reduced and the configuration is large. The present invention can be realized at a low manufacturing cost or an improved cost.

The moving means is not limited to a structure in which the nozzle is moved along a virtual side surface on the downstream side of the nozzle body.
That is, the nozzle may be moved on the upper surface side, or the nozzle may be moved on a virtual one side surface including each end face on the upstream side of each electrode.

The present invention according to claim 2 is characterized in that about 5 to 1
In a dust collector body including a plurality of flat electrodes arranged in parallel at an interval of 0 mm, particles of dry ice having a particle size of about 1 to 2 mm are predetermined from a nozzle toward a space between the electrodes. A cleaning unit that jets at an injection speed and collides with an opposing surface of each electrode is provided, and the cleaning unit changes a jet direction of dry ice particles jetted from the nozzle,
An electric precipitator comprising a swinging means for swinging to both sides with respect to a virtual plane along each electrode of the main body of the precipitator.

According to the present invention, the cleaning means includes a rocking means. The oscillating means oscillates the nozzle itself with respect to a virtual plane along each electrode, or bends or curves the flight distance of the dry ice particles ejected from the nozzle, and oscillates the ejection direction to both sides. This makes 5
Dry ice particles can be made to collide with the opposing surface of each adjacent electrode at a slight angle of about 10 mm at a larger angle, and the surface of each electrode farthest from the region near the nozzle It is possible to make the particles of dry ice collide almost uniformly over the entire surface, and to surely clean the surface of each electrode in the space between each adjacent electrode at a small interval to remove the deposits.

According to a third aspect of the present invention, dry ice particles are directed toward a space between the electrodes in a dust collector main body including a plurality of flat plate-shaped electrodes arranged in parallel at a distance from each other. A cleaning unit that jets from a nozzle and collides with an opposing surface of each electrode is provided, wherein the cleaning unit includes the nozzle, a virtual one side surface commonly including each end surface of a side edge of each electrode of the dust collector main body. Moving means for moving in a horizontal direction parallel to the thickness direction of each electrode at a distance from and a vertical direction perpendicular to the virtual one side surface with respect to the horizontal direction, and dry ice particles ejected from the nozzle A swinging means for swinging the ejection direction to both sides with respect to a virtual plane along each electrode of the dust collector main body. According to the invention, the cleaning means includes a moving means for moving the nozzle in the horizontal and vertical directions. This moving means is configured to separate the nozzle from the virtual one side surface at an interval from one virtual side surface commonly including each end surface of the side edge portion of each electrode, for example, one side surface on the downstream side in the flow direction of the gas containing dust. Above, it can be moved in the horizontal direction parallel to the thickness direction of each electrode and the vertical direction perpendicular to this horizontal direction. The cleaning means includes a rocking means. The oscillating means oscillates the nozzle itself with respect to a virtual plane along each electrode, or bends or curves the flight distance of the dry ice particles ejected from the nozzle, and oscillates the ejection direction to both sides. This allows the dry ice particles to collide with the opposing surface of each adjacent electrode at a larger angle at intervals, and is substantially uniform over the surface of each electrode farthest from the region near the nozzle. Thus, the surface of each electrode can be surely washed and the deposits can be removed in the space between each adjacent electrode at a small interval.

[0021]

FIG. 1 is a system diagram showing a schematic configuration of an electric precipitator 2 according to an embodiment of the present invention, as viewed from the upper side. An electric precipitator 2 is provided in the bypass tunnel for ventilation 1 communicating with the space in the tunnel of the motorway. A blower 3 is provided on the downstream side in the flow direction A of the air containing dust such as dust in the electric precipitator 2. The electrostatic precipitator 2 is provided with opening / closing dampers 5 and 6 at the entrance and the exit of the casing 4, respectively. It is installed in this order from the upstream side in the direction A to the downstream side. The charging unit 8 and the dust collection unit 9 constitute a dust collection device main body.

During operation, the flow direction A is
The contaminated air sucked and introduced into the casing 4 from the upstream side is charged with fine particles such as carbon, dust and concrete powder contained in the contaminated air by the charging unit 8 and electrically charged by the dust collecting unit 9. The air is adsorbed, collected, cleaned, discharged from the blower 3 downstream in the flow direction A, and discharged into the tunnel.

The fine particles collected in this manner adhere to the surfaces of the electrodes of the charging unit 8 and the dust collecting unit 9, so that the fine particles are collected from the cleaning unit 10 arranged downstream of the dust collecting unit 9 in the flow direction A. Dry ice pellets, which are dry ice particles, are jetted to remove fine particles adhering to the electrode surface. Such a washing step is
For example, it is performed about once a day. Cleaning unit 10
Is a nozzle 11 for injecting the dry ice pellet.
And a pellet supply means 13 for supplying the dry ice pellets to the nozzle 11 via a pellet supply pipe 12.

At the bottom of the casing 4, a discharge plenum 14 is provided for collecting the adhered substances that have fallen off the surfaces of the electrodes facing each other and have fallen. In the discharge plenum 14, separation and collection means 15 realized by a bag filter, a cyclone, or the like is provided.
The suction fan 1 is connected to the
7 are connected by a suction line 18. Emission plenum 1
An opening / closing damper 19 is provided at the discharge port 4, and the opening / closing damper 19 allows the internal space of the discharge plenum 14 to communicate with the internal space of the adhering matter recovery pipe 16 or cuts off the internal space.

FIG. 2 is a partial horizontal sectional view showing the arrangement of a plurality of dust collecting electrodes 21 and a nozzle 11 provided in the dust collecting unit 9. FIG. 3 is a dry ice pellet 22 sprayed from the nozzle 11. FIG. 2 is a cross-sectional view showing a state where the light beam has collided with a dust collecting electrode 21. The above-described dust collection unit 9
A plurality of plate-shaped dust collecting electrodes 21 are arranged in parallel at an interval ΔL from each other in the horizontal direction.
Are sprayed at a predetermined spraying speed V from the nozzle holes 23 of the electrodes 21 and collide with the opposing surfaces 24a and 24b of the respective electrodes 21.
The attached matter 25 can be peeled and removed. here,
The opposite surface of each electrode 21 may be a case where both surfaces are to be cleaned or a case where only one surface is to be cleaned, depending on the state of adhesion of the deposit 25. The case of cleaning the surface will be described.

The distance ΔL is about 5 to 10 mm,
The injection speed V of the dry ice pellet 22 from the nozzle hole 23 of the nozzle 11 is about 100 m / sec. The particle size of the dry ice pellet 22 is about 1-2 mm
And its length is about 3 mm. By selecting the particle size of the dry ice pellet 22 in this manner, the dry ice pellet 22 sublimates over the entire length of each electrode 21 having a length L1 of 500 to 1000 mm and collides without attenuating its kinetic energy, and the surface of each electrode 21 is reduced. 24a, 24b
The adhered matter 25 that firmly adheres to the substrate can be reliably peeled off. More specifically, the adhered substance 2 which adheres firmly
5 can be surely peeled off because the electrode surface 24
The dry ice pellets 22 that have collided at a high speed destroy the deposits 25 with their kinetic energy,
Almost simultaneously with contact with the surface, CO ₂ gas is released along the surface 24, and the gas edge action of this gas causes the deposit 2
5 is lifted off the surfaces 24a and 24b and peeled off. If the particle size of the dry ice pellet 22 is small,
Therefore, if the operating energy at the time of colliding with the deposit 25 is small due to its small mass, the deposit 25 cannot be broken and broken, and the gas diffuses to the outside, so that the gas edge effect cannot be obtained. Therefore, as described above, at least the particle size needs to be about 1 to 2 mm, and the injection speed V needs to be about 100 m / sec.

By providing such an injection condition, the deposits 25 can be reliably removed from the downstream end 21a to the upstream end 21b of each electrode 21 in the flow direction A. Further, as described above, since the distance ΔL between the electrodes 21 is as small as about 5 to 10 mm, the surfaces 24a, 2
4b and the flight path of the dry ice pellets 22 sprayed from the nozzle 11 make an angle θ1 of as small as about 1 to 2 ° or less, and collide with the surfaces 24a and 24b at a shallow angle. Only the component force F1 in the direction normal to the surface 24a of the collision force F of the
Therefore, the conditions for spraying the dry ice pellets 22 are selected as described above.

If the particle size of the dry ice pellet 22 is less than about 1 mm, the deposit 25a adhering to the vicinity of the downstream end 21a of the electrode 21 can be removed, but the adhering matter 25a adheres to the upstream end 21b. The dry ice pellets 22 sublime at room temperature before the dry ice pellets 22 reach
5 and therefore no kinetic energy can be obtained. Also dry ice pellet 2
When the particle diameter of the electrode 2 exceeds about 2 mm, the distance Δ
The dry ice pellets 22 ejected subsequently to the dry ice pellets 22 collided with the dry ice pellets 22 adhered to the vicinity of the downstream end 21a collide with each other and accumulate at intervals of By closing ΔL, it becomes impossible to fly the dry ice pellet 22 to the end 21 b on the upstream side, which is the deepest part, and collide with the deposit 25. In order to solve such a problem, the injection conditions such as the particle size and the injection speed of the dry ice pellet 22 are set as described above. Such jetting conditions are also affected by the distance L2 between the tip of the nozzle 11 and the imaginary side surface 27 including each end surface 26 of the end 21a on the downstream side in the longitudinal direction A of each electrode 21. This interval L2
Is selected to be 100 mm or less, and is preferably selected to be 2 to 3 mm as an interval capable of allowing the unevenness of the end face 26 due to the intersection in processing of the electrodes 21.

FIG. 4 is a rear view of the cleaning unit 10 viewed from the downstream side in the flow direction A of the contaminated air, FIG. 5 is a cross-sectional view of the cleaning unit 10 viewed from the right side of FIG. 4, and FIG. It is a simplified system diagram of the means 30. The cleaning unit 10 includes a nozzle 11 and each electrode 2 of the dust collection unit 9.
A lateral direction B parallel to the thickness direction of each electrode 21 (up and down direction in FIG. 2) and an interval L2 from an imaginary side surface 27 commonly including each end surface 26 of the side edge portion 1 and the lateral direction B There is provided a moving unit 30 that can move in the vertical direction C on the virtual one side surface 27. More specifically, the moving means 30 includes a four-framed housing 3.
1, a lifting frame 32 that moves in the vertical direction C within the housing 31, a horizontal driving unit 33 that displaces the nozzle 11 in the horizontal direction B, and a vertical driving unit 34 that moves the lifting frame 32 in the vertical direction C. .

The housing 31 includes a pair of vertical frames 35 and 36 extending vertically and parallel to each other, an upper frame 37 extending in the horizontal direction B and connecting upper ends of the vertical frames 35 and 36, and a horizontal frame 35. A lower frame 38 extends in the direction B and connects the lower ends of the vertical frames 35 and 36. The longitudinal drive means 34 is provided in such a housing 31. Elevating frame 3
Numeral 2 is guided at both longitudinal ends so as to be vertically movable, that is, vertically movable across the vertical frame members 35 and 36. A traveling body 39 to which the nozzle 11 is fixed is provided on the upper surface of the lifting frame 32 so as to be movable in the lateral direction B.

In the lifting frame 32, a horizontal driving means 33 is provided.
Is provided to displace the traveling body 39 in the lateral direction. The lateral driving means 33 is wound around a pair of pulleys 41 and 42 rotatably supported at both ends in the longitudinal direction in the elevating frame 32 around a horizontal rotation axis, and stretched between the respective pulleys 41 and 42. Endless timing belt 43 to be bridged
And a motor 44 for driving one pulley 42 to rotate continuously and intermittently over a predetermined distance. This motor 44 is realized by, for example, a servomotor.

The vertical drive means 34 includes a pair of sprocket wheels 45, 46 provided at both longitudinal ends of one of the vertical frame members 36 so as to be rotatable around a horizontal rotation axis, and winds between the sprocket wheels 45, 46. The elevating chain 47 which is hung and stretched, and the other vertical frame 35
A pair of sprocket wheels 48 and 49 provided at both longitudinal ends thereof so as to be rotatable around a horizontal rotation axis,
An elevating chain 50 wound around and stretched between the sprocket wheels 48 and 49, and sprocket wheels 45 arranged on both ends of the upper frame 37 in the longitudinal direction at the upper ends of the vertical frames 35 and 36, respectively. , 48, a pair of sprocket wheels 51, 52 coaxially connected to each other, a power transmission chain 53 wound and stretched between the sprocket wheels 51, 52, and an upper portion of one vertical frame 36. Two sprocket wheels 4 arranged
An output shaft is connected to each of the motors 5 and 51, and the motor has a vertical movement motor 54 that is driven to rotate.

Each of the elevating chains 47, 50 provided in each of the vertical frame members 35, 36 has an inner stretch portion 55 and an outer stretch portion 5.
6 are connected to each other, so that the lifting frame 32 can be displaced vertically.

One end of a flexible hose 61 is connected to the nozzle 11, and the pellet supply line 12 is connected to the other end of the nozzle 11.

FIG. 7 is a view of the dust collecting unit 9 showing the cleaning path of the nozzle 11 by the moving means 30 as viewed from the downstream side. FIG. 7A shows that the nozzle 11 covers the entire width of each dust collecting electrode 21. FIG. 7 (2) shows a path in which the nozzle 11 is moved from the upper portion 63 to the lower portion 64 by repeating the operation of moving in the vertical direction C by one horizontal line after moving in the width direction B, and FIG. In the meantime, a path for cleaning from one side 65 to the other side 66 by repeating the operation of moving in the vertical direction C and then moving in the horizontal direction B by one vertical line is shown.

As described above, the nozzle 11 can be moved in the horizontal direction B and the vertical direction C by the moving means 30, and the nozzle 11 moves from the downstream to the upstream in the flow direction A of the dust collection unit 9 by such a nozzle 11. The dry ice pellets 22 are sprayed toward them.

When the cleaning operation is started, the nozzle 11 is arranged at an initial value P ₀ near one side 65 of the upper part 63 of the dust collection unit 9 as shown in FIG. After the start of the operation, it is lowered in the vertical direction C to the uppermost row, and then washed while moving in the horizontal direction B from the one side 65 to the other side 66 over the entire width, and is horizontally aligned on the other side 66 side. It moves down by 2 minutes to the second row, and the other side 6
Cleaning is performed while moving laterally from 6 toward one side 65 over the entire width. The cleaning operation is performed from the upper part 63 to the lower part 64 of the dust collection unit 9 while repeating such an operation.

The moving speed in the lateral direction B is V _B = 50-20.
0 mm / sec, and the moving speed in the vertical direction C is V _C
= 50 to 200 mm / sec. Nozzle 1
From 1, the dry ice pellet 22 is sprayed from the dry ice pellet supply means 13 at an injection speed V _P = 100 to 150 m.
/ Sec, it is sprayed in a fixed direction, and almost uniformly contacts the surfaces 24a, 24b over the entire width L1 of each dust collecting electrode 21, thereby removing the deposit 25.

In the cleaning operation in the lateral direction C shown in FIG. 7A, the dry ice pellets 22 jetted from the nozzle 11 are separated from the end surfaces 26 of the respective dust collecting electrodes 21 (see FIG. 2).
Frequently, the space 20 between each dust collecting electrode 21
The amount of air blown into the interior will decrease. Therefore, FIG.
As shown in (2), the nozzles 11 are sequentially moved in the vertical direction C toward the one side 65 or the other side 66 in the vertical direction C, and the cleaning is performed for each vertical column, so that each dust collecting electrode is cleaned. 21
The number of times the dry ice pellets sprayed from the nozzle 11 abut on the end face 26 can be significantly reduced,
The cleaning operation can be performed more efficiently by reducing the use of useless dry ice pellets that do not substantially contribute to cleaning.

FIG. 8 is a sectional view showing a specific structure of the swinging means 70. The cleaning unit 10 includes a swinging unit 70
Is provided. That is, the traveling body 39 movably provided on the elevating frame 32 in the lateral direction B has a hollow box shape, and a swinging means 70 is provided in the traveling body 39. The swing means 70 includes a swing motor 72 fixed to the bottom 71 of the traveling body 39, a follower 73 fixed to the output shaft of the swing motor 72, and a lower end fitted into the follower 73. Shaft 74 having an off-axis axis
A sliding plate 76 provided on the upper plate 75 of the traveling body 39 so as to be displaceable and fixed to the upper end of the shaft 74, a bracket 77 for fixing the nozzle 11 to the sliding plate 76 near the tip end,
Bracket 78 attached near the rear end of nozzle 11
The rear end bracket 78 is fixed, and a right columnar support piece 79 made of a flexible and resilient material such as hard rubber, and the lower end of the support piece 79 are fixed.
9 has a mounting piece 80 which is mounted by welding to the bottom 71.

The swing motor 72 is realized by, for example, a pneumatic motor. When the output shaft of the motor 72 is driven to rotate, the follower 73 and the shaft 74
Is driven to rotate about the rotation axis of the follower 73. At this time, the shaft 74 rotates at a position away from the rotation axis of the follower 73 by an eccentric distance e. The eccentric distance e is, for example, 0.1
It is set appropriately within a range of about 1.0 mm by observing the injection state of the dry ice pellets 22 from within the nozzle 11. The rotation of the follower 73 causes the distal end side of the nozzle 11 to vibrate, and the base end side supports the base end of the nozzle 17 with the support piece 79 allowing the tip end to swing.

The swing direction of the dry ice pellets 22 sprayed from the nozzle 11 by such a rocking means 70 is adjusted with respect to an imaginary plane 81 (see FIG. 2) along the surfaces 24a and 24b of each dust collecting electrode 21. Can be swung to both sides. Such a swing operation of the nozzle 11 is caused by the movement speed V of the nozzle 11 in the lateral direction B by the lateral driving means 33.
_It is determined according to the state of adhesion of the extraneous matter to _B and the surfaces 24a, 24b of the respective dust collecting electrodes 21, and is appropriately set in the range of about 3 to 20 Hz.

With such a swinging means 70, the nozzle 1
1 to the downstream end 21 of each dust collection electrode 21a.
The dry ice pellet 22 can be made to collide with the entire surface from a to the upstream end 21b, and even if the dry ice pellet 22 is jetted while the nozzle 11 is continuously moved by the moving means 30, the surface 24a, 24b The deposit 25 can be reliably removed from the entire surface.

FIG. 9 is a sectional view showing the vicinity of the tip 83 of a nozzle 11a according to another embodiment of the present invention. In the nozzle 11a of the present embodiment, the distal end portion 83 is formed in a right cylindrical shape,
The inner diameter of the distal end portion 83 is selected to be larger than the opposing surfaces 24a and 24b of each pair of dust collecting electrodes 21 sandwiching the plurality of spaces 28. In the distal end portion 83, a substantially frustoconical central block 85 arranged coaxially on the central axis of the distal end portion 83 by a plurality of (four in the present embodiment) ribs 84 at equal intervals in the circumferential direction. Provided. This central block 85
Is formed such that one end portion 86 of the dry ice pellet 22 on the upstream side in the injection direction is formed in a hemispherical shape, and the diameter is increased toward the other end portion 87 on the downstream side in the injection direction D. An annular nozzle hole 23a having an interval m on one radial line is formed between the outer peripheral surface of the other end 87 and the inner peripheral surface of the distal end 83.

The central block 85 allows the nozzle holes 23
The dry ice pellets ejected from a spread radially outward as indicated by an arrow 88 near the outer peripheral portion, and on the downstream side from an end surface 89 perpendicular to the axis at the other end portion 87 of the central block 85, By the wake, the dry ice pellets 22 are drawn inward in the radial direction. In this manner, the spread angle θ2 of the dry ice pellet 22 injected from the nozzle tip is increased, and the dry ice pellet can be injected substantially uniformly. Such a divergence angle θ2 changes the axial distance ΔL1 between the end face 89 of the central block 85 and the end face 91 of the tip part 83 by moving the central block 85 in the axial direction.
When the central block 85 is formed or arranged so as to make 1 smaller, the divergence angle θ2 increases and the interval Δ
When the central block 85 is formed or moved so as to increase L1, the divergence angle θ2 can be reduced.

The distance m between the outer peripheral surface at the other end 87 of the central block 85 and the tip 83 is selected to be slightly larger than the particle size of the dry ice pellet 22. Therefore, when the dry ice pellets 22 pass between the central block 85 and the distal end portion 83, it is possible to reduce the gap where the dry air, which is the transport fluid of the dry ice pellets 22, leaks, Stalls can be prevented.

By using such a nozzle 11a in place of the nozzle 11 of the above-described embodiment, it is possible to spray dry ice pellets over a wide area at one time.
Thereby, the moving speed of the nozzle 11a by the moving means 30 can be increased, and the cleaning time can be reduced.

As still another embodiment of the present invention, the nozzle hole may be expanded in the spraying direction instead of the nozzle 11a having the straight cylindrical tip portion 83 shown in FIG. . By using such a nozzle, dry ice pellets can be sprayed by diffusing into a wider spray area.

As still another embodiment of the present invention, as shown in FIG.
2 is injected by dry air which is a transport fluid
A nozzle hole 93 and a plurality (two in the present embodiment) of second nozzle holes 94a and 94b which are opened radially outward from the first nozzle hole 93 and inject air toward the central axis are formed. Nozzle 11b may be used. Air is individually supplied from a pneumatic pressure source (not shown) to each of the second nozzle holes 94a and 94b.
a, 94b to change the direction of the dry ice pellets jetted at a constant jetting amount from the central first nozzle hole 93 and the transport fluid thereof by changing the discharge pressure or the jetting amount. And the surfaces 24a, 2 of the respective dust collecting electrodes 21 facing each other at a desired alternating cycle.
4b can be alternately contacted.

As described above, since the dry ice pellets sprayed from the first nozzle holes 93 can be alternately and intensively brought into contact with the surfaces 24a and 24b, a high cleaning effect can be achieved.

Each of the second nozzle holes 94a and 94b is formed in an arc shape so as to surround the first nozzle hole 93. This prevents the jet flow of the dry ice pellets 22 jetted from the first nozzle hole 93 from spreading and diffusing immediately after jetting from the first nozzle hole 93, so that the kinetic energy of the jet flow is not dissipated. Dust collection electrode 21a,
A great cleaning effect can be obtained by colliding with the surfaces 24a and 24b of the 21b. Moreover, the second nozzle hole 94
Since the direction of the jet flow of the dry ice pellet 22 jetted from the first nozzle hole 93 can be minutely changed by the a and 94b, it is not necessary to swing the nozzle 11b itself, and the configuration is simplified. .

In the nozzle 11b shown in FIG. 10, the second nozzle holes 94a and 94b have the first nozzle hole 9 at the emission end.
3 is formed to extend in a circular arc shape in the circumferential direction on the outer circumference of the third nozzle hole 3. However, as still another embodiment of the present invention, a plurality of circular second nozzle holes are circumferentially spaced around the first nozzle hole 93 at equal intervals. May be formed in a plurality. With such a circular second nozzle hole, the dry ice pellet 22 jetted from the first nozzle hole 93 can be jetted with a slight angular displacement in an arbitrary direction, and therefore, not only in the left-right direction but also in the right-left direction. Without changing the angle of the jet flow in the vertical and diagonal directions to expand the jet flow of the dry ice pellets 22, the surface 2 of each dust collection electrode 21 is kept thin.
4a and 24b are intensively collided with each other, and the adhered substance can be peeled with a large cleaning energy irrespective of adhesive fine particles and non-adhesive fine particles, and the cleaning effect is improved.

In each of the above embodiments, the dust collection unit 9
However, the charging unit 8 can be similarly cleaned by the cleaning unit 10 described above. In this case, since the linear discharge electrode is provided between the plurality of flat ground electrodes, the nozzle 1
By reducing the injection pressure of the dry ice pellets injected from 1 compared with the case of the dust collection unit 9 or reducing the particle diameter without changing the injection pressure and washing, the breakage of the discharge wire is prevented, In addition, it is possible to reliably remove the deposit.

[0054]

According to the first aspect of the present invention, the nozzle moved by the moving means is spaced apart from the virtual one side surface so that the nozzle outlet is separated by the end face of each electrode. Blocking is prevented, damage to the end faces of each electrode and clogging of the nozzles are prevented, and the particles of dry ice can be smoothly and continuously ejected from the nozzles. In addition, the moving means continuously
Or it is possible to wash over a wide area while spraying dry ice particles from multiple nozzles,
The number of nozzles can be reduced as compared with the case where the moving means is not provided, so that the configuration does not increase in size, and the present invention can be realized at low manufacturing cost or improvement cost.

According to the second aspect of the present invention, the oscillating means is provided in the cleaning means, so that the nozzle itself is oscillated with respect to a virtual plane along each electrode, or dry ice sprayed from the nozzle is removed. The jetting direction can be swung to both sides by bending or bending the flight distance of the particles. This allows the dry ice particles to collide with the opposing surface of each adjacent electrode at a slight distance of about 5 to 10 mm at a larger angle, and the area of the surface of each electrode near the nozzle Dry ice particles can be made to collide almost uniformly over the region farthest from the surface, and the surface of each electrode is surely washed in the space between each adjacent electrode at a small interval to remove deposits be able to.

According to the third aspect of the present invention, since the cleaning means is provided with the moving means and the oscillating means, the nozzle is oscillated while the nozzle is moved in the vertical and horizontal directions by the moving means. Thereby, the particles of dry ice can be made to collide with the entire surface of each electrode facing each other at a small interval between the electrodes, and the deposits attached to the surface of each electrode can be reliably removed.

[0057]

[0058]

[0059]

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating a schematic configuration of an electric precipitator 2 according to an embodiment of the present invention.

FIG. 2 is a partial horizontal sectional view showing an arrangement of a plurality of dust collecting electrodes 21 and a nozzle 11 provided in the dust collecting unit 9.

FIG. 3 is a cross-sectional view showing a state in which a dry ice pellet 22 injected from a nozzle 11 collides with a dust collecting electrode 21.

FIG. 4 is a rear view of the moving means 30 as viewed from the downstream side in the flow direction A of the contaminated air.

FIG. 5 is a side view of the moving means 30 as viewed from the right side of FIG.

FIG. 6 is a simplified system diagram of the moving means 30.

FIG. 7 is a view of the dust collection unit 9 showing a cleaning path of the nozzle 11 by the moving unit 30 as viewed from the downstream side.
(1) shows a path for washing from the upper part 63 to the lower part 64 by repeating the operation in which the nozzle 11 moves in the horizontal direction B over the entire width of each dust collection electrode 21 and then moves in the vertical direction C by one horizontal line, and FIG. 7 (2) is a case where the nozzle 11 is
FIG. 9 shows a path for washing from one side 65 to the other side 66 by repeating the operation of moving in the vertical direction C over the entire height and then moving in the horizontal direction B by one vertical line.

FIG. 8 is a cross-sectional view showing a specific configuration of the swing means 70.

FIG. 9 is a cross-sectional view of the vicinity of a distal end portion 83 of a nozzle 11a according to another embodiment of the present invention.

FIG. 10 shows a nozzle 11 according to still another embodiment of the present invention.
It is a perspective view near the front-end | tip part 83a of b.

[Explanation of symbols]

 Reference Signs List 2 electric dust collecting device 3 blower 4 casing 5, 6 opening / closing damper 8 charging unit 9 dust collecting unit 10 cleaning unit 11, 11a, 11b nozzle 21, 21a, 21b dust collecting electrode 22 dry ice pellet 23 nozzle hole 24a, 24b surface Reference Signs List 25 attached matter 26 end face 27 virtual one side face 28 space 30 moving means 32 elevating frame 39 traveling body 70 swing means 81 virtual plane

Continuation of front page (72) Inventor Kenichi Masamoto 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Plant (56) References JP-A-7-275735 (JP, A) Japanese Patent Application Laid-Open No. Sho 55-167075 (JP, A) Japanese Patent Application Laid-Open No. 4-176346 (JP, A) Japanese Patent Application Laid-Open No. 1-119320 (JP, A) Japanese Utility Model Application Laid-Open No. 63-185464 (JP, U) (58) Int.Cl. ⁷ , DB name) B03C 3/00-3/88

Claims (3)

(57) [Claims] 1. A dust collector having a plurality of flat electrodes arranged in parallel at a distance of about 5 to 10 mm from each other, and having a particle size of about 1 to 2 mm toward a space between the electrodes. Cleaning means for injecting the dry ice particles from the nozzle at a predetermined injection speed to impinge on the opposing surfaces of the respective electrodes, wherein the cleaning means sets the nozzle to a side edge of each electrode of the dust collector main body. Moving means for moving in a horizontal direction parallel to the thickness direction of each electrode at a distance from a virtual side surface commonly including each end face of the portion and a vertical direction perpendicular to the virtual side surface with respect to the horizontal direction. An electrostatic precipitator characterized by the above-mentioned. 2. A dust collector main body comprising a plurality of plate-like electrodes arranged in parallel at intervals of about 5 to 10 mm from each other, and has a particle size of about 1 to 2 mm toward a space between the electrodes. Cleaning means for injecting the dry ice particles from the nozzle at a predetermined injection speed and colliding with the opposing surfaces of the respective electrodes is provided, wherein the cleaning means adjusts the jet direction of the dry ice particles injected from the nozzle. And an oscillating means for oscillating both sides with respect to a virtual plane along each electrode of the main body of the dust collector. 3. A method of injecting dry ice particles from a nozzle toward a space between each electrode into a dust collector main body including a plurality of flat plate-shaped electrodes arranged in parallel at a distance from each other. A cleaning means for colliding with an opposing surface of the electrode is provided, wherein the cleaning means is configured to separate the nozzles from the virtual one side surface including the respective end surfaces of the side edges of the electrodes of the dust collector main body in common. A moving means for moving in a horizontal direction parallel to the thickness direction of the liquid crystal and a vertical direction perpendicular to the horizontal direction on the virtual one side surface; And an oscillating means for oscillating both sides with respect to a virtual plane along each electrode of the main body.