JP5768423B2 - Electric dust collector - Google Patents

Description

  The present invention relates to an electrostatic precipitator configured to remove particulate matter from particulate matter-containing gas such as exhaust gas of an internal combustion engine that contains particulate matter (PM).

Exhaust gas discharged from an internal combustion engine contains NOx, SOx, and harmful substances such as particulate matter containing carbon as a main component. It is known that various health hazards occur when a human inhales particulate matter into the body by breathing, and the development of an electrostatic precipitator that efficiently collects particulate matter is desired.
In such an electrostatic precipitator, if the collected particulate matter is left as it is, the collection efficiency is lowered. Therefore, it is necessary to perform a cleaning process for washing out the collected particulate matter. As an electrostatic precipitator having such a cleaning function, for example, a dust collecting part that is formed in a passage through which air containing a large amount of suspended particulates in a tunnel in an electric precipitator passes is opposed from the downstream side and used for collecting collected dust. An auxiliary dust cleaning system for an electric dust collector equipped with an air blow type dust cleaning mechanism has been proposed (see, for example, Patent Document 1).

  Also, a soot adsorption device that is connected to the exhaust pipe of the combustion engine and electrically adsorbs soot contained in the passing exhaust gas, and a regeneration device that cleans and removes the soot adsorbed on the soot adsorption device and restores its adsorption power Also, an exhaust purification device is proposed which is constituted by a nuclear condensing device that removes soot and harmful exhaust gas by condensing liquefied exhaust gas with soot as a core connected to an exhaust pipe of a combustion engine (see, for example, Patent Document 2). .

  Furthermore, a discharge electrode and a dust collection electrode are arranged in each of a plurality of dust collection passages through which air containing dust is passed, and a charge is applied to the dust using corona discharge, and the dust is collected by applying a Coulomb force to the dust. There has also been proposed an electrostatic precipitator that collects in the dust electrode and performs cleaning with a water spray nozzle and drying with heated air with the inlet damper and outlet damper of one dust collecting passage closed. (For example, see Patent Documents 3 to 5).

JP 60-28838 A JP 2000-64818 A Japanese Patent Laid-Open No. 10-244183 JP-A-6-55100 JP-A-3-26353

However, in the conventional examples described in Patent Documents 1 to 5, an electric dust collecting part is arranged in an air flow path through which air containing dust and the like passes, and dust collected by the electric dust collecting part is collected. Similarly, the cleaning mechanism arranged in the air flow path is used for cleaning, and when the electrostatic dust collecting part is cleaned by the cleaning mechanism, the air flowing through the air flow path is stopped and the voltage applied to the electrostatic dust collecting part is applied. Cleaning is performed after stopping, and there is an unsolved problem that dust cannot be collected during cleaning.
Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and the collected particulate matter can be recovered without stopping the passage of the particulate matter-containing gas. The object is to provide an electrostatic precipitator.

In order to achieve the above object, an electrostatic precipitator according to an embodiment of the present invention comprises a discharge electrode extending in the axial direction, covering the discharge electrode with a predetermined distance in the radial direction, and a required number of through holes. A cylindrical electrode having a casing electrode that covers the outside of the cylindrical electrode while maintaining a predetermined distance in the radial direction, and applying a high voltage between the discharge electrode, the cylindrical electrode, and the casing electrode, The particulate matter of the particulate matter-containing gas flowing through the cylindrical electrode is charged and passed through the through hole of the cylindrical electrode to compensate the outer peripheral surface of the cylindrical electrode and the inner peripheral surface of the casing electrode. A high voltage source to be collected, and a recovery mechanism for recovering the particulate matter disposed in a collection region for collecting the particulate matter between the outer peripheral surface of the cylindrical electrode and the inner peripheral surface of the casing electrode. wherein the recovery mechanism, the tubular electrode and casings A fluid injection nozzle that is disposed on one end side in the axial direction of the electrode and blows off the collected particulate matter, and a fluid that includes the particulate matter disposed on the other end side in the axial direction of the cylindrical electrode and the casing electrode. And a fluid suction part for suction .

According to this configuration, the particulate matter-containing gas is allowed to pass through the inside of the cylindrical electrode, and the particulate matter contained in the particulate matter-containing gas is collected in a collecting region between the cylindrical electrode and the casing electrode. Since the collection mechanism that collects the particulate matter collected in the collection region is provided, the collection mechanism can be arranged in a region different from the inside of the cylindrical electrode that becomes the passage of the particulate matter-containing gas. The particulate matter can be recovered in a state where the substance-containing gas is flowed.
In addition, since the fluid ejection nozzle is arranged on one end side of the collection region and the fluid suction part is provided on the other end side, the particulate matter collected by the cylindrical electrode and the casing electrode by the fluid ejected from the fluid ejection nozzle is collected. By blowing off to the other end side and sucking the blown off particulate matter with a fluid suction device, the collected particulate matter can be effectively recovered.

The electrostatic precipitator according to one aspect of the present invention includes a plurality of electrode storage portions extending in the axial direction formed by partitioning a cylindrical housing with a partition plate, and each of the electrode storage portions is axially A discharge electrode extending in a radial direction, covering the discharge electrode with a predetermined distance in the radial direction and having a required number of through-holes, and a casing electrode covering the outside of the cylindrical electrode with a predetermined distance in the radial direction And applying a high voltage between the discharge electrode and the cylindrical electrode and the casing electrode to charge the particulate matter of the particulate matter-containing gas flowing through the cylindrical electrode, A high voltage source that passes through the through hole of the electrode and collects on the outer peripheral surface of the cylindrical electrode and the inner peripheral surface of the casing electrode, and between the outer peripheral surface of the cylindrical electrode and the inner peripheral surface of the casing electrode The grains arranged in a collection area for collecting the particulate matter And a recovery mechanism for recovering Jo material, the recovery mechanism is arranged on one end side in the axial direction of the tubular electrode and the casing electrode, and a fluid injection nozzle to blow the particulate matter scavenged, the tubular And a fluid suction part for sucking a fluid containing the particulate matter disposed on the other end side in the axial direction of the electrode and the casing electrode .

According to this configuration, the cylindrical housing includes a plurality of electrode storage portions that are partitioned by the partition plate and extend in the axial direction, and each electrode storage portion includes a discharge electrode, a cylindrical electrode, a cylindrical housing, and a partition plate. Since each electrode storage part becomes an individual electric dust collecting part, a collecting mechanism for collecting particulate matter can be provided at the collecting part of each electric dust collecting part. , Particulate matter can be individually collected in units of electrostatic precipitators, limiting the amount of fluid used for recovery, reducing the capacity of compressors and suction pumps, reducing the diameter of piping, reducing the size of equipment, Cost reduction is possible.
In addition, since the fluid ejection nozzle is arranged on one end side of the collection region and the fluid suction part is provided on the other end side, the particulate matter collected by the cylindrical electrode and the casing electrode by the fluid ejected from the fluid ejection nozzle is collected. By blowing off to the other end side and sucking the blown off particulate matter with a fluid suction device, the collected particulate matter can be effectively recovered.

Moreover, the electrostatic precipitator which concerns on the other form of this invention is characterized by the said fluid injection nozzle being comprised so that gas may be injected.
According to this configuration, since the gas is ejected from the fluid ejection nozzle, the particulate matter can be recovered while the collection region is in a dry state.

Moreover, the electric dust collector which concerns on the other form of this invention is characterized by the said fluid injection nozzle being comprised so that a liquid may be injected.
According to this configuration, since the liquid is ejected from the fluid ejection nozzle, it is possible to reliably peel off and collect even the particulate matter. In this case, by installing the fluid ejection nozzle on the upper side, the flow velocity of the ejection liquid can be increased using gravity.

Moreover, the electrostatic precipitator which concerns on the other form of this invention is characterized by the said liquid being either water, seawater, or a washing | cleaning liquid.
According to this configuration, water is used as the liquid if it is on land, seawater is used if it is a ship or the like, and if the particulate matter is severely contaminated, the cleaning liquid is used to collect the particulate matter. I do.

Further, in the electrostatic precipitator according to another aspect of the present invention, the cylindrical electrode has an opening ratio of the through hole at a value that prevents fluid from the fluid ejection nozzle from flowing into the cylindrical electrode. It is characterized by being set.
According to this configuration, the opening ratio of the through hole of the cylindrical electrode is set to a value that prevents the fluid ejected from the fluid ejection nozzle from flowing into the cylindrical electrode. It is possible to prevent the particulate matter once collected after the fluid has flowed in from being peeled off and scattered again, and the particulate matter can be reliably recovered.

In the electrostatic precipitator according to another aspect of the present invention, the cylindrical electrode does not form the through hole at a position facing at least one of the fluid ejection nozzle and the fluid suction portion of the recovery mechanism. A non-formation region is formed.
According to this configuration, since the through-hole non-forming region where the through-hole is not formed is formed at a position where the cylindrical electrode opposes at least one of the fluid ejection nozzle and the fluid suction portion constituting the recovery mechanism, the fluid ejection nozzle It is possible to reliably prevent the fluid ejected from the pipe from entering the cylindrical electrode, and the fluid flows into the cylindrical electrode and the particulate matter once collected is peeled off and scattered again. And particulate matter can be reliably recovered.

  According to the present invention, the particulate matter-containing gas is allowed to flow inside the cylindrical electrode to be charged to the particulate matter by the discharge electrode, and the charged particulate matter is passed through the through hole by the Coulomb force to the outside of the cylindrical electrode. And collected in the collecting region between the cylindrical electrode and the casing electrode. By wiping off the collected particulate matter using a recovery mechanism, for example, using a fluid, the particulate matter can be recovered in the collection region separated from the passage of the particulate matter-containing gas, The particulate matter can be recovered with the particulate matter-containing gas flowing.

  Further, according to the present invention, a plurality of electrode storage portions that are partitioned by a partition plate and extend in the axial direction are provided in the cylindrical housing, and each electrode storage portion includes a discharge electrode, a cylindrical electrode, and a cylindrical housing. And a casing electrode composed of a partition plate, each electrode storage portion becomes an individual electric dust collecting portion, and a collecting mechanism for collecting particulate matter is provided in the collecting portion of each electric dust collecting portion. It is possible to collect particulate matter individually for each electrostatic precipitator, limit the amount of fluid used for recovery, reduce the capacity of compressors and suction pumps, reduce the diameter of piping, Miniaturization and cost reduction are possible.

It is a whole lineblock diagram showing a 1st embodiment of an electric dust collector concerning the present invention. It is an external appearance perspective view which removes and shows a part of outer cylinder of the electric dust collector of FIG. It is a perspective view which shows the principal part of an electric dust collector. It is a perspective view which expands and shows the inner cylinder electrode and discharge electrode of an electric dust collector. It is a characteristic diagram which shows the relationship between an aperture ratio and a resistance coefficient. It is a perspective view which removes and partially shows the outer cylinder of the electrostatic precipitator which shows the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention.
In the figure, reference numeral 1 denotes, for example, particulate matter (PM: Particulate Matter) having a particle size of 100 μm or less, mainly containing carbon contained in the exhaust gas of an internal combustion engine, particularly a diesel engine, in particular, a suspended particle shape having a particle size of 10 μm or less It is an electrostatic precipitator capable of collecting a substance (SPM: Suspended Particulate Matter).
The electric dust collector 1 is supplied with particulate matter-containing gas discharged from the diesel engine 2.

  As shown in FIGS. 2 and 3, the electrostatic precipitator 1 includes a truncated gas pyramid-shaped gas guide 15 for introducing the particulate matter-containing gas supplied from the diesel engine 2, and the gas guide 15. A swirl flow forming portion 16 for sending the particulate matter-containing gas formed on the downstream side as a swirl flow, and an electrode support disposed on the downstream side of the swirl flow forming portion 16 for supporting, for example, a discharge electrode 17 having a dodecahedron cross section. A part 18, an electrostatic precipitator 19 disposed on the downstream side of the electrode support 18, and a discharge electrode support 20 disposed on the most downstream side.

The electrostatic precipitator 19 constitutes a cylindrical electrode 21 made of, for example, stainless steel that covers the discharge electrode 17 at a predetermined distance in the radial direction, and a cylindrical housing that surrounds and supports the cylindrical electrode 21. It is composed of a rectangular tube-like casing electrode 22.
Here, as shown in FIG. 4, each of the discharge electrodes 18 has an electrode group in which four needle-like electrodes 17a are formed at intervals of 90 ° in the circumferential direction on the outer peripheral surface, and each electrode group maintains a predetermined interval in the direction of three sets of axes. In this way, a large number of them are formed so as to be shifted by 30 ° in the circumferential direction.

  Further, the cylindrical surface of the cylindrical electrode 21 has a width (for example, about several mm) sufficiently larger than the particle diameter of the particulate matter at a position facing the needle electrode portion 17a of the discharge electrode 17, Many oblong through holes 21a extending in the direction are formed. The shape of the through-hole 21a is not limited to an oval shape, and a punching pipe may be applied as a circle.

Then, as shown in FIG. 3, the discharge electrodes 17 and the cylindrical electrode 21 and the discharge electrode 17 and the negative electrode side between the casing electrode 22, 10 ³ to 10 of the cylindrical electrode 21 and the casing electrode 22 and the positive electrode side Connect a DC high-voltage power supply DC of about ⁵ volts, and ground the positive electrode side. In this state, when the particulate matter-containing gas is supplied as a swirling airflow between the discharge electrode 17 and the cylindrical electrode 21, the particulate matter contained in the particulate matter-containing gas is charged by corona discharge. The electric field between the discharge electrode 17 and the cylindrical electrode 21 causes the Coulomb force to act on the particulate matter, and the particulate matter starts to move toward the tubular electrode 21. Since the particulate matter has a mass, it passes through the through hole 21 a of the cylindrical electrode 21 as it is due to inertial force and is guided to the collection region 23 which is a semi-closed space between the cylindrical electrode 21 and the casing electrode 22.

  In this collection region 23, the flow field is very gentle, so that the particulate matter is not easily affected by the flow field, and the particulate matter is an electric charge due to its own charge and the potential difference between the cylindrical electrode 21 and the casing electrode 22. In response to the image force, they are collected by moving and adhering to the outer peripheral surface of the cylindrical electrode 21 and the inner peripheral surface of the casing electrode 22. In addition, according to the numerical analysis, compared with the flow velocity of the particulate matter-containing gas main flow in the gas flow path in the cylindrical electrode 21, about 1/20 to 1/10 in the most part of the collection space 23, locally. It has been confirmed that the flow rate is about 1/4.

Further, both end portions in the axial direction of the casing electrode 22 are closed by end plates 25 a and 25 b having a center opening 24 as shown in FIG. 2, and the center openings 24 of these end plates 25 a and 25 b communicate with the cylindrical electrode 21. Has been.
A semi-closed space surrounded by the cylindrical electrode 21, the casing electrode 22, and the end plates 25 a and 25 b serves as a particulate matter collection region 23, and the particulate matter collected by the end plates 25 a and 25 b in the collection region 23. A recovery mechanism 26 for recovering the substance is formed.

  The recovery mechanism 26 includes, for example, four fluid injection nozzles 27 at four corners surrounded by the casing electrode 22 of the lower end plate 25a so that air as a fluid is directed upward and the outer peripheral surface of the cylindrical electrode 21 and the casing. It arrange | positions so that it may inject along the internal peripheral surface of the electrode 22. FIG. These fluid injection nozzles 27 are connected to a compressor 28 disposed outside, and compressed air is supplied from the compressor 28.

  Further, in the recovery mechanism 26, for example, four fluid suction portions 29 are arranged at four corners surrounded by the casing electrode 22 of the upper end portion 25b so as to face the fluid ejection nozzles 27, respectively. As shown in FIG. 1, these fluid suction portions 29 are connected to a suction pump 31 through a cyclone 30 disposed outside, and are fluids ejected from a fluid ejection nozzle 27 in the collection region 23, for example, air. The blown away particulate matter is sucked and exhausted to the outside.

The cylindrical surface of the cylindrical electrode 21 facing the fluid ejection nozzle 27 is a through hole non-forming region 21b in which the through hole 21a is not formed. Similarly, the cylindrical surface facing the fluid suction part 29 of the cylindrical electrode 21 is a through-hole non-forming region 21c in which the through-hole 21a is not formed.
Furthermore, the opening ratio β of the through hole 21a of the cylindrical electrode 21 is set to 0.4 to 0.5 when the Reynolds number is set to Re = 16, for example, as shown in FIG. K increases, and an air flow rising while blowing off the particulate matter injected from the fluid injection nozzle 27 and collected on the outer peripheral surface of the cylindrical electrode 21 and the inner peripheral surface of the casing electrode 22 is cylindrical through the through hole 21a. It is possible to prevent the electrode 21 from entering the inner peripheral side.

  According to the electrostatic precipitator 1, the particulate matter-containing gas is simply passed through the gas flow path between the discharge electrode 17 and the cylindrical electrode 21, and there is no need to provide a blower or the like as an extraction means. Moreover, since it is not necessary to provide a damper or the like that obstructs the flow of the particulate matter-containing gas, the pressure loss of the particulate matter-containing gas can be reduced. Furthermore, since the diameter of the through-hole 21a formed in the cylindrical electrode 21 can be formed to a large diameter regardless of the particle diameter of the particulate matter, the pressure loss corresponding to this can be suppressed small. Further, since the particulate matter is collected on the outer peripheral surface of the cylindrical electrode 21 constituting the collection space 23 and the inner peripheral surface of the casing electrode 22, a large amount of particulate matter corresponding to the surface area of both the electrodes 21 and 22 is collected. While the collection can be permitted, the through-hole 21a is extremely difficult to be clogged, and it is possible to reliably prevent the collection failure due to the clogging. Furthermore, since the flow field of the collection space 23 is small, it is difficult for the particulate matter collected once to re-scatter. Moreover, since there are no movable parts such as dampers and blowers, the possibility of failure is extremely low.

Next, the operation of the first embodiment will be described.
The particulate matter-containing gas exhausted from the diesel engine 2 is supplied to the electrostatic precipitator 1, and flows from the gas introduction unit 15 into the cylindrical electrode 21 of the electric dust collector 19 as a swirling air flow in the swirling flow forming unit 16. It is. As described above, when the particulate matter-containing gas passes through the cylindrical electrode 21, the particulate matter is charged by corona discharge, and the charged particulate matter is penetrated through the through-hole 21a of the tubular electrode 21 by Coulomb force. To the collecting region 23 outside the cylindrical electrode 21, and adhere and collect on the outer peripheral surface of the cylindrical electrode 21 and the inner peripheral surface of the casing electrode 22.
When the adhering and collecting particulate matter increases, the recovery mechanism 26 is operated to collect the adhering and collecting particulate matter on the outer peripheral surface of the cylindrical electrode 21 and the inner peripheral surface of the casing electrode 22 to the outside.

  In this case, the particulate matter is collected by letting the particulate matter-containing gas flow through the cylindrical electrode 21, charging the particulate matter by corona discharge, and collecting the region 23 through the through hole 21a by Coulomb force. Compressed air is jetted upward at a predetermined flow rate from the four fluid jet nozzles 27 while maintaining the dust collection state to be moved to. The compressed air ejected from the fluid ejection nozzles 27 is diffused and rises along the outer peripheral surface of the cylindrical electrode 21 and the inner peripheral surface of the casing electrode 22, and the particulate matter adhering to and collected by these is moved upward. Blow away. On the other hand, since the four fluid suction parts 29 are sucked by the suction pump 31 to suck air above the collection region 23, the particulate matter blown off by the jet air rises together with the air and flows into the fluid. It is discharged to the external cyclone 30 through the suction part 29. The cyclone 30 performs solid-gas separation to separate particulate matter and collect it downward, and the air from which the particulate matter has been separated is sucked into a suction pump and exhausted to the outside.

  When the particulate matter is recovered by the recovery mechanism 26, the cylindrical electrode 21 in the vicinity of the fluid injection nozzle 27 is formed with a through hole non-forming region 21b in which the through hole 21a is not formed. It is possible to reliably prevent the air jetted from 27 from flowing into the cylindrical electrode 21. Similarly, since the cylindrical electrode 21 in the vicinity of the fluid suction part 29 is also formed with the through-hole non-forming region 21c, only the air containing the particulate matter sucked by the fluid suction part 29 is sucked to form a cylindrical shape. The suction of the gas from which the particulate matter passing through the electrode 21 is removed can be reliably prevented.

Further, since the opening ratio β of the through-hole 21a of the cylindrical electrode 21 is formed to be 0.4 to 0.5 which is a value that increases the resistance coefficient K, air containing particulate matter passes through the through-hole 21a. Intrusion into the electrode 21 can be reliably prevented.
If the particulate matter adhered and collected on the outer peripheral surface of the cylindrical electrode 21 and the inner peripheral surface of the casing electrode 22 remains even after the fluid is ejected from the fluid ejection nozzle 27 of the recovery mechanism 26, the fluid ejection When a liquid such as water or seawater is ejected from the nozzle 27 and the particulate matter still remains, the liquid is made to contain a cleaning agent and ejected from the fluid ejection nozzle 27 as a cleaning liquid. As described above, when liquid such as water, seawater, and cleaning liquid is ejected from the fluid ejection nozzle 27, the fluid ejection nozzle 27 is formed on the upper end plate 25b, and the fluid suction portion 29 is formed on the lower end plate 25a. It is preferable to do.

  As described above, according to the first embodiment, the particulate matter-containing gas flows through the cylindrical electrode 21, and the particulate matter collecting region 23 is formed outside the cylindrical electrode 21. Since the collection mechanism 26 for collecting the particulate matter collected in the collection region 23 is disposed, the collection is performed in the collection region 23 without stopping the flow of the particulate matter-containing gas in the cylindrical electrode 21. The particulate matter can be recovered, and the collection efficiency of the particulate matter from the particulate matter-containing gas can be improved.

  In addition, the recovery mechanism 26 has a configuration in which a fluid ejection nozzle 27 is disposed at one end in the axial direction of the collecting region 23 between the cylindrical electrode 21 and the casing electrode 22 and a fluid suction portion 29 is disposed at the other end. The fluid ejected from the fluid ejection nozzle 27 is passed through the collection region 23 in the axial direction, and the particulate matter adhered and collected on the outer peripheral surface of the cylindrical electrode 21 and the inner peripheral surface of the casing electrode 22 is blown upward. The particulate matter can be collected outside by being sucked by the fluid suction portion 29 together with the fluid flow.

At this time, through-hole non-formation regions 21b and 21c are formed in the vicinity of the fluid ejection nozzle 27 and the fluid suction portion 29 of the cylindrical electrode 21, and the through-hole 21a is not formed in these regions. It is possible to reliably prevent the fluid jetted from flowing into the cylindrical electrode 21.
Further, by selecting the opening ratio of the through hole 21a of the cylindrical electrode 21 to a value that increases the resistance coefficient, the fluid ejected from the fluid ejection nozzle 27 passes through the through hole 21a and the inner periphery of the cylindrical electrode 21. Intrusion to the side can be reliably prevented, and it can be prevented that the fluid flows into the cylindrical electrode 21 and the particulate matter once collected is peeled off and scattered again.

  As a fluid used in the recovery mechanism 26, air is applied as a gas, and water is applied as a liquid when the diesel engine 2 is a vehicle engine, and seawater is applied when the diesel engine 2 is a marine engine. And when using a liquid, when the collection | recovery of a particulate matter is inadequate, it is preferable to apply the washing | cleaning liquid which added the washing | cleaning agent to water or seawater.

Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, by forming a plurality of electrode storage portions extending in the axial direction, a plurality of electrostatic dust collection portions are formed to improve the dust collection capability.
That is, in the second embodiment, as shown in FIG. 6, the conductive corners having a size corresponding to the size obtained by combining, for example, four electrostatic precipitators 1 in the first embodiment described above. A cylindrical casing 41 is provided. The inside of the housing 41 is partitioned by a cross-shaped partition plate 42 when viewed from above, and four electrode storage portions 43a to 43d extending in the axial direction are formed.

As shown in FIG. 3 in the first embodiment described above, the particulate matter-containing gas is introduced into each of the electrode storage portions 43a to 43d as a swirling flow by the gas introduction portion 15 and the swirling flow forming portion 16. An electric dust collector 19 is formed.
A rectangular cylindrical casing electrode 44 is formed by the inner surface of the casing 41 outside the cylindrical electrode 21 and the partition plate 42. Further, the cylindrical electrode 21 is held at both ends in the axial direction by end plates 45a and 45b having an opening 34 in the center, and a collecting region 46 between the cylindrical electrode 21 and the casing electrode 44 by these end plates 45a and 45b. The upper and lower ends are closed.

Then, four fluid ejection nozzles 47 are arranged on the upper surface of the lower end plate 45a of each electrode storage portion 43a to 43d as in the first embodiment, and penetrate the upper surface from the lower surface of the upper end plate 45b. In addition, a fluid suction portion 48 that faces the fluid ejection nozzle 47 is formed. The fluid supply portions of the fluid ejection nozzles 47 of the electrode storage portions 43a to 43d are connected to each other for each of the electrode storage portions 43a to 43d and connected to the external compressor 28 via individual electromagnetic on-off valves 49, and the fluid suction portion 38. Is also connected to a suction pump 31 via a cyclone 30 via an individual electromagnetic on-off valve 50.
Through holes 21b and 21c are formed on the upper and lower ends of the cylindrical electrode 21, and the opening ratio of the through hole 21a is set to a value that increases the resistance coefficient K. The ejected fluid is prevented from entering the cylindrical electrode 21 through the through hole 21a.

  Also in this 2nd Embodiment, since the structure of the electrode storage parts 43a-43d has the structure similar to the electrostatic dust collection part 19 of the electrostatic dust collector 1 in 1st Embodiment mentioned above, each electrode storage part 43a. ˜43d, the particulate matter contained in the particulate matter-containing gas flowing individually through the cylindrical electrode 21 is charged by corona discharge, and the charged particulate matter is penetrated through the cylindrical electrode 21 by Coulomb force. 21a is attached and collected on the outer peripheral surface of the cylindrical electrode 21 and the inner peripheral surface of the casing electrode 44, which form the collection region 46. At this time, since the four electrostatic precipitators 19 in the first embodiment described above are formed, the collecting ability of the particulate matter can be quadrupled.

And in order to collect | recover the particulate matter collected by each electrode accommodating part 43a-43d, the electromagnetic on-off valves 49 and 50 of any one electrode accommodating part, for example, 43a, are opened. The other electromagnetic on-off valves 49 and 50 are maintained in the closed state by controlling to the state.
As a result, a compressed fluid is supplied to the fluid ejection nozzle 47 of the electrode storage portion 43a, the fluid is ejected upward into the collection region 46, and the fluid is sucked from the fluid suction portion 48, whereby a cylindrical electrode is obtained. The particulate matter collected on the outer peripheral surface of 21 and the inner peripheral surface of the casing electrode 44 is blown off and discharged to the external cyclone 30 together with the fluid flow for recovery.

  As described above, by collecting the particulate matter collected in each of the electrode storage portions 43a to 43d individually, the fluid supply source such as the compressor and the fluid suction source such as the suction pump are the same as in the first embodiment. One electrode storage portion 43a to 43d is sufficient, the capacity of the fluid supply source, the cyclone 30 for collecting particulate matter and the suction pump 31 can be reduced, and the pipe connecting them can be reduced in diameter. The apparatus configuration can be reduced in size and the cost can be reduced.

  In the case of the second embodiment, there are four electrode storage portions 43a to 43d. Therefore, one of the electrode storage portions 43a to 43d allows the particulate matter-containing gas to flow for recovery of the particulate matter. Even if it is stopped, it can be operated with 75% efficiency. This efficiency increases as the number of electrode storage portions to be formed increases. For example, when the number of electrode storage portions is 10, even when the flow of particulate matter-containing gas in one of the electrode storage portions is stopped, the efficiency is 90%. Can be used.

In the first and second embodiments, the case where the particulate matter contained in the particulate matter-containing gas discharged from the diesel engine 2 is removed has been described. However, the present invention is not limited to this. Particulate matter can be removed from any particulate matter-containing gas discharged from other internal combustion engines or industrial machines.
Moreover, in the said 1st and 2nd embodiment, although the case where the casing electrode 22 of the electrostatic dust collection part 19 was a rectangular tube shape was demonstrated, it is not limited to this, The cylindrical electrode 21 is used. It suffices if the semi-closed collection space 23 can be formed and covered, and can have any shape such as a cylindrical shape, a honeycomb shape, or a polygonal cylindrical shape.

  Similarly, the cylindrical electrode 21 is not limited to a cylindrical shape, and may have any shape as long as the distance between the inner peripheral surface of the discharge electrode 17 facing the needle electrode 17a and the needle electrode 17a is equal. It can be. That is, when the discharge electrode 17 having a dodecahedron cross section is used as described above, it may be formed in a dodecagonal tube shape, and may have an arbitrary shape according to the number of protrusions of the needle electrode.

Moreover, in the said 1st and 2nd embodiment, although the case where the acicular electrode 17a of the discharge electrode 17 was shifted and protruded in an axial direction was demonstrated, it is not limited to this, The acicular electrode 17a The protruding direction may be the same direction.
In the first and second embodiments, the case where the particulate matter-containing gas is introduced as the swirling flow by the swirling flow forming unit 16 has been described. However, when the pressure loss due to the swirling flow forming unit 16 is desired to be reduced. In this case, the particulate matter-containing gas may be passed as it is without providing the swirl flow forming portion 16.

  DESCRIPTION OF SYMBOLS 1 ... Electric dust collector, 2 ... Diesel engine, 15 ... Gas introduction part, 16 ... Swirling flow formation part, 17 ... Discharge electrode, 17a ... Needle electrode, 18 ... Discharge electrode support part, 19 ... Electric dust collection part, DESCRIPTION OF SYMBOLS 20 ... Discharge electrode support part, 21 ... Cylindrical electrode, 21a ... Through-hole, 21b, 21c ... Through-hole non-formation area | region, 22 ... Casing electrode, 23 ... Collection space, DC ... DC high voltage power supply, 25a, 25b ... End Plate, 26 ... Recovery mechanism, 27 ... Fluid injection nozzle, 28 ... Compressor, 29 ... Fluid suction part, 30 ... Cyclone, 31 ... Suction pump, 41 ... Housing, 42 ... Partition plate, 43a-43d ... Electrode storage part, 45a, 45b ... end plate, 46 ... collection region, 47 ... fluid injection nozzle, 48 ... fluid suction part, 49, 50 ... electromagnetic on-off valve

Claims (7)

A discharge electrode extending in the axial direction;
A cylindrical electrode having a required number of through holes covering the discharge electrode in a radial direction while maintaining a predetermined distance;
A casing electrode that covers the outside of the cylindrical electrode while maintaining a predetermined distance in the radial direction;
A high voltage is applied between the discharge electrode and the cylindrical electrode and the casing electrode to charge the particulate matter of the particulate matter-containing gas flowing through the cylindrical electrode, and A high voltage source that passes through the through hole and collects on the outer peripheral surface of the cylindrical electrode and the inner peripheral surface of the casing electrode;
A recovery mechanism for recovering the particulate matter disposed in a collecting region for collecting the particulate matter between the outer peripheral surface of the cylindrical electrode and the inner peripheral surface of the casing electrode ;
The recovery mechanism is disposed on one end side in the axial direction of the cylindrical electrode and the casing electrode, and a fluid ejection nozzle that blows off the collected particulate matter; and the other end side in the axial direction of the cylindrical electrode and the casing electrode An electrostatic precipitator , comprising: a fluid suction part that sucks a fluid containing the particulate matter disposed in the container . A plurality of electrode storage portions extending in the axial direction formed by partitioning the inside of the cylindrical housing with a partition plate,
Each of the electrode storage portions is
A discharge electrode extending in the axial direction;
A cylindrical electrode having a required number of through holes covering the discharge electrode in a radial direction while maintaining a predetermined distance;
A casing electrode that covers the outside of the cylindrical electrode while maintaining a predetermined distance in the radial direction;
A high voltage is applied between the discharge electrode and the cylindrical electrode and the casing electrode to charge the particulate matter of the particulate matter-containing gas flowing through the cylindrical electrode, and A high voltage source that passes through the through hole and collects on the outer peripheral surface of the cylindrical electrode and the inner peripheral surface of the casing electrode;
A recovery mechanism for recovering the particulate matter disposed in a collecting region for collecting the particulate matter between the outer peripheral surface of the cylindrical electrode and the inner peripheral surface of the casing electrode ;
The recovery mechanism is disposed on one end side in the axial direction of the cylindrical electrode and the casing electrode, and a fluid ejection nozzle that blows off the collected particulate matter; and the other end side in the axial direction of the cylindrical electrode and the casing electrode An electrostatic precipitator , comprising: a fluid suction part that sucks a fluid containing the particulate matter disposed in the container . Wherein the fluid injection nozzle, an electric dust collector of claim 1 or 2, characterized in that it is configured to inject a gas. Wherein the fluid injection nozzle, an electric dust collector of claim 1 or 2, characterized in that it is configured to inject the liquid. The electrostatic precipitator according to claim 4 , wherein the liquid is water, seawater, or a cleaning liquid. The tubular electrode, any claim 1 to 5, characterized in that the opening ratio of the through hole is fluid in the fluid ejection nozzle is set to a value that prevents flowing into the cylindrical electrode The electric dust collector of Claim 1. The tubular electrode according to claim 1, characterized in that the through-hole-free region that does not form the through hole at a position opposed to at least one of the fluid ejection nozzle and the fluid suction portion of the recovery mechanism is formed The electric dust collector of any one of thru | or 6 .

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