JP3640489B2 - Electrostatic precipitator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrostatic precipitator.
[0002]
[Prior art]
Generally, a case of an electrostatic precipitator that collects mist and the like is formed with a lower suction port for sucking air into the case and an upper discharge port for discharging air from the case to the outside. . An air flow path is formed between the lower suction port and the upper discharge port. More specifically, as shown in FIG. 6, two electrode support plates 50, 51 are arranged at a predetermined interval in the middle of the air flow path A <b> 1 on the upstream side and the downstream side. In 51, through holes 50a and 51a are formed in a lattice shape for allowing air to pass therethrough. The base ends of rod-shaped upper and lower discharge electrodes 52 and 53 are connected to the electrode support plates 50 and 51, respectively. In the case (not shown), cylindrical upper and lower dust collecting electrodes 54 and 55 are provided so as to cover the periphery of the discharge electrodes 52 and 53, and are sucked from the lower suction port (not shown). The air flows through the dust collecting electrodes 54 and 55 and is discharged from an upper discharge port (not shown).
[0003]
At the time of use of the electrostatic precipitator, both current Chirikyoku 54, 55 and a voltage is applied to both discharge electrodes 52 and 53 to generate a DC electric field between the two electrodes, the two current Chirikyoku within 54 and 55 by the DC electric field To charge fine particles such as mist contained in the air flowing through. Then, mist or the like receives Coulomb attractive force and moves toward the inner side surfaces of the two dust collecting electrodes 54 and 55, and adheres to the inner side surfaces of the two dust collecting electrodes 54 and 55. As a result, mist or the like is removed from the air, and air from which the mist or the like has been removed is discharged from the upper discharge port.
[0004]
[Problems to be solved by the invention]
However, since the electrostatic dust collector requires two electrode support plates 50 and 51, if there are a plurality of electrode support plates 50 and 51 in the middle of the air flow path A1, the air flow rate is reduced. As a result, there is a problem that the dust collection efficiency is lowered.
[0005]
An object of the present invention is to improve dust collection efficiency by preventing a decrease in the flow velocity of air flowing on an air flow path.
[0006]
[Means for Solving the Problems]
The invention of claim 1 is provided with a plurality of discharge electrodes in the cylindrical inside collecting electrode, to generate a direct current electric field between two electrodes by applying a voltage to the electrode discharge and the dust collection electrode, by the direct current field In the electrostatic precipitator for attaching fine particles in the dust removal fluid flowing through the dust collection electrode to the dust collection electrode, a single support member is provided on the dust removal fluid flow path, and the support member has an upstream side thereof. The proximal end of the first discharge electrode is connected on the side, and the proximal end of the second discharge electrode is connected on the downstream side, and the distal ends of the first and second discharge electrodes correspond to the respective discharge electrodes. The gist is that it extends to the vicinity of the inlet of the fluid to be removed formed on the dust collecting electrode .
[0007]
The gist of the invention described in claim 2 is that, in the invention described in claim 1, the first and second discharge electrodes are constituted by a single electrode member.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the electrode member is formed in a rod shape, and the first and second discharge electrodes have their axes aligned with each other. The gist is that they are arranged to face each other.
[0009]
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the side portion of the dust collecting electrode has a communicating portion communicating with the inside and outside of the dust collecting electrode. It is summarized as having.
[0010]
The invention according to claim 5 is the invention according to any one of claims 1 to 4 , wherein a dust outlet fluid outlet is formed downstream of the inlet of the dust collecting electrode. The communication portion extends from the introduction port toward the outlet port and extends in the same direction as the discharge electrode.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the case 12 of the electrostatic precipitator 11 is formed in a square box shape, and air containing mist or the like as a dust removal fluid is introduced into the case 12. . Although not shown, an upper suction port for sucking air containing mist and the like is provided at the upper portion of the case 12 and air for collecting mist and the like collected by the electrostatic precipitator 11 is discharged to the lower portion of the case 12 to the outside. A lower discharge port is formed. That is, the vertical direction of the case 12 (vertical direction in FIG. 1) is an air flow path A indicated by an arrow in FIG. 1, and the air flows into the case 12 through the upper suction port, From the bottom of the case 12 to the outside through the lower discharge port.
[0012]
As shown in FIG. 1, on the upstream side of the case 12, a plurality of upper corner pipes 13 made of a conductor such as aluminum are arranged as dust collecting electrodes so as to extend in the vertical direction. The bracket 14 is fixed to the inner surface of the case 12. The upper square pipe 13 is connected to the power supply 15 and is charged to the negative pole by the power supply 15. As shown in FIG. 2, the upper square pipe 13 is similarly formed in a square shape in cross section, and is welded to each other by being combined in a square shape of 10 steps each in the vertical direction and the horizontal direction. As shown in FIG. 4, the upper end of each upper corner pipe 13 is an air inlet 13a, and the lower end is an air outlet 13b.
[0013]
Further, as shown in FIGS. 1 and 2, slits 16 as communicating portions extending in the vertical direction are formed at the corners of the combined upper corner pipes 13, and the upper corners are respectively connected through the slits 16. The inside and outside of the pipe 13 are in communication. The slit 16 extends in the vertical direction from the inlet 13a of the upper square pipe 13 toward the outlet 13b.
[0014]
As shown in FIG. 1, a bracket 17 is provided on the inner surface of the case 12 below the upper corner pipe 13, and a plurality of insulating posts are erected on the upper end of the bracket 17. An electrode support plate 19 as a support member is attached to the upper end of the insulating support column 18. That is, a single electrode support plate 19 is provided on the air flow path A in the case 12. The electrode support plate 19 is connected to the power source 15 and is charged to the positive electrode by the power source 15. The electrode support plate 19 is entirely covered with an insulator made of nylon resin or the like including its upper and lower surfaces. 4 and 5, the electrode support plate 19 has a plurality of rectangular through holes 19a formed at equal intervals in the left-right direction (left-right direction in FIG. 4).
[0015]
As shown in FIG. 1, below the electrode support plate 19, a plurality of lower square pipes 20 made of a conductor such as aluminum are attached to the inner portion of the bracket 17 as dust collecting electrodes so as to extend in the vertical direction. Yes. The lower square pipe 20 is connected to a power source 15 and is charged to the negative pole by the power source 15. As shown in FIG. 3, the lower square pipe 20 is formed in a square cross section like the upper square pipe 13 and is combined into a square shape of 10 stages (100 pieces in total) in the vertical and horizontal directions. They are welded together. As shown in FIG. 4, the upper end of the lower square pipe 20 is an air inlet 20a, and the lower end is an air outlet 20b. That is, the lower square pipe 20 and the upper square pipe 13 communicate with each other through the through hole 19 a of the electrode support plate 19.
[0016]
4, as shown in FIG. 5, is the electrode support plate 19 a plurality of mounting holes 19 b aligned along the longitudinal direction of each through hole 19a is formed. This is the mounting hole 19 b is the electrode pin 21 is inserted as an electrode member extending in the vertical direction so as to correspond to the upper and lower corner pipes 13 and 20, around the electrode pin 21 is fixed by welding. Each electrode pin 21 is loosely inserted into the upper and lower double pipes 13 and 20, respectively. The electrode pins 21 extend in the same direction as the slits 16, and there are 10 (100 in total) in the vertical and horizontal directions. The electrode pin 21 is a single rod-shaped member, and the upstream side of the air flow path A with the electrode support plate 19 as a boundary is an upper discharge electrode 22 as a first discharge electrode. A downstream side of A is a lower discharge electrode 23 as a second discharge electrode. That is, the upper and lower discharge electrodes 22 and 23 are arranged to face each other so that their axis lines L1 and L2 coincide with each other.
[0017]
Further, sharpened portions 22a and 23a are formed at the tips of the discharge electrodes 22 and 23, respectively. The sharpened portion 22a of the upper discharge electrode 22 is positioned near the inlet 13a of the upper square pipe 13, and the sharpened portion 23a of the lower discharge electrode 23 is positioned near the inlet 20a of the lower rectangular pipe 20. That is, the tips of the discharge electrodes 22 and 23 are extended near the inlets 13a and 20a of the square pipes 13 and 20, respectively. Further, since the outer peripheral surfaces of the discharge electrodes 22 and 23 are covered with an insulator made of nylon resin or the like except for the respective sharp portions 22a and 23a, the discharge electrodes 22 and 23 are surely insulated from the upper and lower pipes 13 and 20. Has been. For this reason, the electrode pin 21 is charged to the positive electrode in the same manner as the electrode support plate 19.
[0018]
When a voltage of about 10000 volts is applied to the discharge electrodes 22 and 23 and the upper and lower pipes 13 and 20 by the power source 15, the discharge electrodes 22 and 23 charged to the positive pole and the upper and lower angles charged to the negative pole. powerful DC electric field is formed between the pipe 13 and 20. As a result, a shower of positive ions from both discharge electrodes 22 and 23 toward the upper and lower pipes 13 and 20 is generated. Therefore, when air containing mist or the like is introduced into the upper and lower pipes 13 and 20, the mist is positively charged by colliding with positive ions, and receives the strong Coulomb force generated by the DC electric field to receive the upper and lower pipes 13 and 20. Move in the direction toward the inner surface. And mist adheres to the inner surface of the up-and-down both corner pipes 13 and 20.
[0019]
Next, the operation of the electrostatic precipitator 11 configured as described above will be described.
When air containing fine particles such as mist is sent into the case 12 through an upper suction port (not shown) of the case 12, the air is introduced into the upper square pipe 13. At this time, when a voltage is applied to the electrode pin 21 and the upper corner pipe 13, the discharge is performed from the sharpened portion 22 a of the upper discharge electrode 22 toward the inlet 13 a of the upper corner pipe 13. Then, a DC electric field is generated between the upper discharge electrode 22 and the upper square pipe 13, and the mist contained in the air is attracted to the upper square pipe 13 by the DC electric field, and is formed on the inner surface of the upper square pipe 13. To be attached.
[0020]
Further, when discharging from the sharpened portion 22a of the upper discharge electrode 22, a DC electric field is generated so as to wind a vortex from the slit 16 to the outside of the upper square pipe 13 (see arrow S shown in FIG. 1). Due to the spiral DC electric field, mist or the like contained in the air comes out of the upper corner pipe 13 while being swirled, and is attached to the outer surface of the upper corner pipe 13. Therefore, it adheres not only to the inner surface of the upper corner pipe 13 but also to the outer surface.
[0021]
Further, since the sharpened portions 22a and 23a of the discharge electrodes 22 and 23 are extended in the vicinity of the introduction ports 13a and 20a, the air charged to the negative pole due to the discharge goes out of the square pipes 13 and 20. However, it is easy to return to the inside due to the flow pressure of the air flowing through the air flow path A.
[0022]
Further, the air from which mist or the like has been removed by the upper corner pipe 13 passes through the outlet 13 b of the upper corner pipe 13 and the respective through holes 19 a of the electrode support plate 19 and is introduced into the lower corner pipe 20. At this time, when a voltage is applied to the electrode pin 21 and the lower square pipe 20, the discharge is performed from the sharpened portion 23 a of the lower discharge electrode 23 toward the inlet 20 a of the lower square pipe 20. Then, like the upper square pipe 13, mist or the like contained in the air is attached to the inner side surface of the lower square pipe 20 by the DC electric field.
[0023]
Then, the air purified through the upper and lower pipes 13 and 20 is discharged from the lower discharge port (not shown) of the case 12 to the outside of the case 12. On the other hand, mists and the like attached to the inner and outer side surfaces of the upper square pipe 13 and the inner side surface of the lower square pipe 20 are combined with each other to form liquid droplets. It descends along the way and drops downward from the outlets 13b and 20b of the upper and lower pipes 13 and 20. The dropped liquid droplets are discharged to the outside of the case 12 through a discharge hole (not shown) formed in the lower part of the case 12.
[0024]
The present embodiment has the following effects.
(1) Even if the two square pipes 13 and 20 are provided separately on the upstream side and the downstream side of the electrode support plate 19, since the electrode support plate 19 is reduced from two to one, the electrode support plate 19 is Compared with the case where there are two, the flow velocity of air inside the case 12 does not decrease. Therefore, a large amount of fine particles such as mist contained in the air can be collected in a short time, and the dust collection efficiency can be improved.
[0025]
(2) Since the electrode support plate 19 and the upper and lower discharge electrodes 22 and 23 are configured by the single electrode pin 21, the upper and lower discharge electrodes 22 and 23 may not be separately assembled to the electrode support plate 19. Therefore, the number of parts can be reduced and the number of assembling steps can be reduced. Therefore, the manufacturing cost of the electrostatic precipitator 11 can be reduced, and the electrostatic precipitator 11 as a whole can be downsized.
[0026]
(3) The electrode pin 21 is formed in a rod shape so that the axis lines L1 and L2 of the upper and lower discharge electrodes 22 and 23 coincide. Therefore, when the electrode pin 21 is inserted into the mounting hole 19a of the electrode support plate 19, it can be easily assembled as compared with the case where the electrode pin 21 is bent.
[0027]
(4) The sharpened portions 22a and 23a of the discharge electrodes 22 and 23 are extended to the vicinity of the introduction ports 13a and 20a. Therefore, even if the air charged to the negative pole comes out of the square pipes 13 and 20 as compared with the arrangement of the sharpened portions 22a and 23a near the outlets 13b and 20b, the fluid pressure flowing through the air flow path A Accordingly, it can be easily returned. Therefore, the air passing through the upper and lower pipes 13 and 20 can be reliably purified.
[0028]
(5) By forming the slit 16 in the upper corner pipe 13, mist and the like contained in the air are attached not only to the inner side surface of the upper corner pipe 13 but also to the outer side surface. Therefore, compared with the case where the slit 16 is not formed, the adhesion area of fine particles such as mist can be increased, and more mist or the like can be adhered. Therefore, the dust collection capability of the electrostatic dust collector 11 can be improved.
[0029]
(6) Since the plurality of through holes 19a are formed in the electrode support plate 19, the air passage area can be increased as compared with the case where each through hole 19a has a lattice shape. Therefore, it is possible to further prevent the air flow rate in the case 12 from being lowered, and to improve the dust collection efficiency of the electrostatic dust collector 11.
[0030]
In addition, you may comprise this invention as follows besides the said embodiment.
In the above-described embodiment, air containing mist or the like as a dust removal fluid is used. However, for example, air containing smoke or dust, oil or water containing dust, etc. may be purified. Good.
[0031]
In the embodiment described above, a pair of upper and lower rectangular pipes 13 and 20 and electrode pins 21 are provided on the upstream side and the downstream side of the electrode support plate 19, respectively. In addition to this, for example, when the downstream side of the electrode support plate 19 is branched into the bifurcated air flow path A, a pair of square pipes are provided in each branch path, and at the downstream side of the electrode support plate 19. You may make it make the lower part of the electrode pin 21 bifurcated and loosely insert them in the square pipe provided in each branch path.
[0032]
In the above embodiment, the upper square pipe 13, the electrode support plate 19 and the lower square pipe 20 are arranged in a straight line along the vertical direction. It is also possible to arrange the curved lines 19 and 20 along the air flow path A. Moreover, in the said embodiment, although the air flow path A was made into the perpendicular direction, it can also be changed into a horizontal direction or a diagonal direction.
[0033]
In the above embodiment, the shape of the electrode pin 21 is a straight line in which the axes L1 and L2 of the discharge electrodes 22 and 23 coincide with each other. However, the shape may be changed to an arbitrary shape without being limited to this shape.
[0035]
In the above embodiment, the upper corner pipe 13 is provided with the slit 16 as the communication portion. However, the slit 16 may be replaced by a long hole, or a plurality of slits 16 or a plurality of long holes may be formed. Alternatively, in addition to providing the slit 16 in the upper square pipe 13, a slit may be provided in the lower square pipe 20, and the slit 16 may be extended from the inlet 20a of the lower square pipe 20 toward the outlet 20b. Furthermore, the slit 16 of the upper corner pipe 13 provided in the above embodiment can be omitted.
[0036]
【The invention's effect】
According to the first aspect of the present invention, it is possible to prevent the flow velocity of the air flowing on the air flow path from being lowered, so that it is possible to improve the dust collection efficiency. Furthermore, since the tips of the first and second discharge electrodes are extended near the inlet of the dust removal fluid formed on each dust collection electrode, the dust removal fluid charged by the discharge of the discharge electrode is outside the dust collection electrode. It will be easy to return to the inside of the dust collection electrode even if it comes out. Therefore, the fine particles in the dust removal fluid can be reliably collected.
[0037]
According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the first and second discharge electrodes are constituted by a single electrode member, so that the number of parts can be reduced. Therefore, the manufacturing cost of the electrostatic precipitator can be reduced.
[0038]
According to the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, since the electrode member is formed in a rod shape, the electrode member can be easily assembled.
[0040]
According to the invention of claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, a DC electric field it is possible to generate a spiral, the dust collection electrode Fine particles in the dust removal fluid can be adhered to the inside and outside. Therefore, since the adhesion area of the fine particles in the dust removal fluid can be increased, the dust collection capability of the electrostatic dust collector can be improved.
[0041]
According to the invention described in claim 5, it is possible in addition to the effects of the invention described in any one of claims 1 to 4, to generate efficiently spiral DC electric field, the dust collection electrode Fine particles in the dust removal fluid can be reliably attached to the inside and outside of the chamber.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an electrostatic precipitator according to an embodiment.
FIG. 2 is a plan view showing an upper square pipe according to an embodiment.
FIG. 3 is a plan view showing a lower square pipe according to an embodiment.
FIG. 4 is an enlarged sectional view showing an electrostatic precipitator according to one embodiment.
FIG. 5 is a perspective view showing an electrode pin and an electrode support plate in one embodiment.
FIG. 6 is a schematic explanatory view showing a conventional electrostatic dust collector.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 13 ... Upper corner pipe (dust collection electrode), 13a ... Inlet port, 13b ... Outlet port, 16 ... Slit (communication part), 19 ... Electrode support plate (support member), 20 ... Lower corner pipe (dust collection electrode), 20a ... introduction port, 20b ... outlet port, 22 ... upper discharge electrode (first discharge electrode), 21 ... electrode pin (electrode member), 23 ... lower discharge electrode (second discharge electrode), L1, L2 ... axis ,

Claims (5)

A plurality of discharge electrodes in the cylindrical inside collecting electrode, to generate a direct current electric field between two electrodes by applying a voltage to the electrode discharge and the dust collection electrode, the dust circulating through the dust collecting in-electrode by the DC electric field In the electrostatic precipitator that attaches the fine particles in the fluid to the dust collector,
A single support member is provided on the flow path of the dust removal fluid, and the base end of the first discharge electrode is connected to the support member on the upstream side, and the base end of the second discharge electrode on the downstream side. connect,
The tip of the first and second discharge electrodes is an electrostatic precipitator that extends to the vicinity of the inlet of the dust removal fluid formed on the dust collection electrode corresponding to each discharge electrode . The electrostatic precipitator according to claim 1, wherein the first and second discharge electrodes are configured by a single electrode member. 3. The electrostatic precipitator according to claim 1, wherein the electrode member is formed in a rod shape, and the first and second discharge electrodes are arranged to face each other so that their axes coincide with each other. The electrostatic precipitator according to any one of claims 1 to 3, wherein a side portion of the dust collecting electrode has a communication portion that communicates with the inside and outside of the dust collecting electrode . A dust extraction fluid outlet is formed downstream of the inlet of the dust collecting electrode, and the communicating portion extends from the inlet to the outlet side along the flow path of the dust removal fluid . The electrostatic precipitator according to any one of claims 1 to 4.

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