JP2003103130A - Method and apparatus for removing particulate matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for removing a particulate matter even in a region where removal is difficult such as a lower layer part and the inside of multipores. SOLUTION: A honeycomb-shaped ceramic filter 9 is provided with a first ventilation cell 12 having one end opened and the other end closed, and a second ventilation cell 13 provided with a barrier rib shared with the barrier rib of the first ventilation cell and having one end closed and the other end opened. A pair of electrodes 3 and 4 are arranged at a prescribed distance to energize the honeycomb-shaped ceramic filter 9. An intermittent voltage application means 5 is connected to the electrodes to intermittently apply voltage to the electrodes in a manner of stopping energization and energizing again. Thereby, the particulate matter stored in the ceramic filter 9 is removed without causing removal omission even in the region where the removal is difficult such as the lower layer part and the inside of multipores.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particulate matter removing method for regenerating a ceramic filter for removing particulate matter discharged from an internal combustion engine such as a diesel engine mounted on an automobile, and the like. The present invention relates to a particulate matter removing device.

[0002]

2. Description of the Related Art An apparatus utilizing a so-called honeycomb ceramic filter is known as a prior art for removing particulate matter contained in the exhaust gas of a diesel engine (for example, Japanese Unexamined Patent Publication No. 6-146852). . The honeycomb-shaped ceramic filter used in this apparatus has an interior partitioned by partition walls of porous ceramic, and a large number of elongated ventilation cells are formed in the interior in a converged state. And the above-mentioned ventilation cell is provided with a first ventilation cell whose one end on the inflow side is open and whose other end is closed, and a partition shared with the partition of the first ventilation cell, and one end is closed, and the outflow side is And a second ventilation cell whose other end is opened.

A honeycomb ceramic filter having such a structure is incorporated in an exhaust passage of a diesel engine, and exhaust gas discharged from the diesel engine is circulated from the first ventilation cell to the second ventilation cell through the partition wall, The particulate matter in the exhaust gas is captured by the partition wall.

In such a honeycomb ceramic filter, the particulate matter trapped accumulates as it is used for a long time,
The trapping property and the flowability of the particulate matter deteriorate. Therefore, it is necessary to remove (called regeneration) the particulate matter that has accumulated periodically. In the above technique, one electrode is inserted into each of two adjacent ventilation cells of the ventilation cells to form a pair of electrodes through at least a partition wall, and low-temperature plasma is generated between the electrodes. A gas containing radicals rich in oxidizing and reducing properties is generated in the aeration cell. That is, the honeycomb ceramic filter is regenerated by reacting radicals with soot, which is the main component of the deposited particulate matter, to generate carbon dioxide gas, carbon monoxide gas, nitrogen gas, and the like.

[0005]

However, in the above-mentioned method using radicals, a gas containing radicals is mainly brought into contact with a particulate matter to cause a chemical reaction, so that the gas is unlikely to permeate into the lower layer or inside the pores. In some cases, it was difficult to reach all the sites and it was not possible to remove all of the accumulated particulate matter. The present invention solves such a problem, and a particulate matter removing method and a particulate matter removing apparatus capable of removing particulate matter even in a difficult-to-remove portion such as a lower layer portion or a porous portion. The purpose is to provide.

[0006]

The method for removing particulate matter according to the first aspect of the present invention is a method for removing particulate matter which removes particulate matter trapped in the partition walls of a ceramic filter whose interior is partitioned by partition walls 11 made of porous ceramic. A method of providing a pair of electrodes 3 and 4 at both ends of the ceramic filter and / or at arbitrary intervals in a longitudinal direction, and intermittently generating a discharge between the electrodes to cause the particulate state on a path of the discharge. The material is incinerated and removed, and the non-discharge period of the discharge is longer than the time immediately before the insulation on the discharge path is restored.

The "time" may be any time as long as the insulation on the discharge path immediately before is restored, and it is determined by measuring the insulation resistance of the discharge path, or a time set in advance as set forth in claim 2. Can be Further, when the above-mentioned time is a predetermined time, as described in claim 2, it is set to 0.2 seconds or more so as to be a non-discharge period of the discharge in which the insulation on the discharge path immediately before is restored. be able to.

In the particulate matter removing device according to the third aspect of the present invention, the inside of the honeycomb ceramic filter 9 is partitioned by a partition wall 11 made of porous ceramic, and a large number of elongated ventilation cells C are arranged in the inside of the honeycomb ceramic filter 9 to generate exhaust gas. The ventilation cell C is provided in the middle of the exhaust pipe 8 and is provided with a first ventilation cell 12 having one end opened and the other end closed, and a partition shared with the partition of the first ventilation cell. A second ventilation cell 13 having a closed portion and an opening at the other end, and the exhaust gas discharged from the exhaust gas generation source is circulated from the first ventilation cell to the second ventilation cell. The particulate matter in the exhaust gas can be captured by the partition wall 11, and the pair of electrodes 3 and 4 are arranged so as to directly face each other with a predetermined distance d in the longitudinal direction of the first ventilation cell 12. Intermittent voltage applying means 5 is applied to the electrode. Characterized in that the Luo voltage is intermittently can be applied.

Further, as described in claim 4, the honeycomb ceramic filter 9 has the gaps S1 and S for disposing the electrodes 3 and 4 at a predetermined distance d in the longitudinal direction thereof.
2, S3, S4, S5, and the electrodes 3, 4 in the gap.
Among them, one electrode can be provided so as to be opposite to the other electrode. When the distance between the end faces of the honeycomb-shaped ceramic filter is long and the discharge is unlikely to occur between the electrodes arranged between the end faces, the electrodes are arranged at every interval d at which the discharge easily occurs as described above, and the electrodes are arranged between the electrodes. By causing discharge, discharge can be generated in the entire area of the honeycomb-shaped ceramic filter and regeneration can be performed.

Further, as described in claim 5, the honeycomb-shaped ceramic filter 9 can be composed of a plurality of vertically divided filters which can be vertically divided. Further, as described in claim 6, the electrodes 3 and 4 have substantially the same shape and size as the end face of the honeycomb ceramic filter 9, and are provided in the annular conductor 21 and the annular conductor 21. A plurality of cell-shaped electrodes 22 can be configured by a connecting body that is connected in a planar shape. Further, as shown in claim 7, the inner edge portion 22a of the cell-shaped electrode 22 projects slightly inward from the inner surface of the first ventilation cell 12, and the outer edge portion 22b of the cell-shaped electrode 22. Can have a shape that has no step with the inner surface of the second ventilation cell 13 or that extends slightly outward from the inner surface.

Further, as described in claim 8, the intermittent voltage applying means 5 includes at least a power source 16 and a timer 17, and the timer stops the energization of the electrode from the power source and a predetermined time elapses. Then, the energization of the electrodes can be restarted from the power source. Further, the predetermined time can be 0.2 seconds or more.

[Operation] In the exhaust source of the internal combustion engine of the diesel engine, etc., in the middle of the exhaust pipe, for example,
When the honeycomb ceramic filter having the above structure is installed on the upstream side of the muffler attached to the exhaust pipe, the exhaust gas of the diesel engine enters the first ventilation cell whose one end on the inflow side is open. Do not enter the second vent cell, which is closed. However, since the other end of the first ventilation cell is closed and the partition wall is made of a porous ceramic, the exhaust gas introduced into the first ventilation cell passes through the partition wall to the second ventilation cell adjacent to it. enter. If the particulate matter contained in the exhaust gas is larger than a predetermined particle size, it is trapped by the partition wall and accumulated on it.

As shown in FIG. 1, the present particulate matter removing method and the particulate matter removing apparatus are provided on both sides of the aeration cell C,
The pair of electrodes 3 and 4 are spaced apart from each other by a predetermined distance, and moreover, the partition wall 1
1 are arranged so as to directly face each other without being blocked by 1, and a predetermined voltage is applied to the electrodes 3 and 4 from the intermittent voltage applying means 5. Since the carbon material accumulated on the first ventilation cell 12, typically the particulate matter 6 mainly composed of soot, has conductivity, the path having the smallest electric resistance is the portion where the particulate matter 6 is accumulated more. Next, the energizing path L1 is created.

Since the particulate matter 6 is both a conductor and an electric resistor, the power consumption of the energizing path L1 is large, and the particulate matter 6 generates heat in accordance with the consumed amount and becomes high temperature, and eventually. To burn. The combustion of the particulate matter 6 gradually spreads and expands along the energization path L1. However, as the particulate matter 6 is incinerated, the energization on the energization path L1 becomes unstable, and the arc discharge occurs at that portion. An arc discharge path L2 with 7 is formed. Further, since the electric resistance of the arc discharge path L2 is relatively small, even if all of the particulate matter 6 in the energization path L1 is incinerated, a stable current flows due to the arc discharge 7, so that a current between the electrodes 3 and 4 is generated. This makes it difficult to form a new current-carrying path on the particulate matter 6 in other parts.
As a result, the locations where the particulate matter 6 is removed on the first ventilation cell 12 are locally unevenly distributed.

Therefore, a predetermined voltage is applied to the electrodes 3 and 4 for a predetermined time, or the generation state of the arc discharge 7 is grasped by the voltage between the electrodes 3 and 4, the amount of noise, and the like, and then, on the energizing path L1. When it is considered that the particulate matter 6 is removed, the driving of the intermittent voltage applying means 5 connected to the electrodes 3 and 4 is stopped, and the application of the voltage to the electrodes 3 and 4 is stopped. Then, since the particulate matter on the current-carrying path L1 which has been energized up to that point is lost and the arc discharge has disappeared, the resistance of the current-carrying path L1 becomes high, and the partition wall between the electrodes 3 and 4 becomes high. Another current-carrying path L3 having a small electric resistance in the planar layer of the particulate matter 6 still accumulated on 11 becomes a new current-carrying path. As a result, it becomes possible to remove the particulate matter 6 in the vicinity of the energizing path L3 as in the energizing path L1. After that, by conducting such energization intermittently and repeating energization and non-energization, the entire honeycomb ceramic filter 9 can be purified. In addition, by setting the non-discharge time in the non-discharge state to 0.2 seconds or more,
Since the insulating property of the arc discharge path L2 is sufficiently restored, the entire honeycomb ceramic filter 9 can be purified.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present particulate matter removing method and particulate matter removing apparatus will be described in more detail with reference to Examples with reference to FIGS. 1. Structure of Particulate Matter Removal Device Next, referring to the drawings, an embodiment of the present invention will be described in detail. As shown in FIG. 2, a muffler (not shown) is provided in the middle of an exhaust pipe 8 of a diesel engine (not shown). ), The honeycomb ceramic filter 9 is inserted in the support pipe 10 whose diameter is larger than that of the exhaust pipe 8. The honeycomb-shaped ceramic filter 9 is formed from a porous ceramic such as alumina, mullite, cordierite, silicon carbide, silicon nitride, aluminum nitride, barium titanate, and zirconia, and has a cylindrical appearance as shown in FIG. , And a large number of elongated rectangular tube-shaped ventilation cells C formed by partitioning with a partition wall 11 made of a porous ceramic.

As shown in FIGS. 2 to 4, the ventilation cell C is constructed by alternately arranging first ventilation cells 12 and second ventilation cells 13. Further, a first ventilation cell 12 in which one end portion on the upstream side of the support tube 10 is opened and the other end portion on the downstream side is also closed, and a partition wall 1 of the first ventilation cell 12.
1 and the second ventilation cell 13 having one end on the upstream side of the support tube 10 closed and the other end on the downstream side opened. Therefore, the first ventilation cell 12 is surrounded by the second ventilation cell 13 and the second ventilation cell 1
3 is surrounded by the first ventilation cell 12, and it can be said that both the ventilation cells 12 and 13 communicate with each other through the pores of the partition wall 11.

Further, as shown in FIGS. 3 and 4, the honeycomb-shaped ceramic filter 9 has a structure in which it can be divided into circular slices at predetermined intervals d in the longitudinal direction, and each of the divided pieces is divided. Configured as filters 9a-9e. In addition, as shown in FIG. 4, the split filters 9a to 9e are provided with one end portion 1 on the exhaust gas inflow side of the first ventilation cell 12.
2a, a gap between the adjacent divided filters 9a to 9e, and the other end 12b of the first ventilation cell 12 are respectively provided with a pair of electrodes 3 and 4 alternately.

That is, the honeycomb-shaped ceramic filter 9 shown in FIG. 3 is divided into five divided filters 9a.about.
9e, the five gaps S of the divided filters adjacent to each other are provided.
An electrode 4, an electrode 3, an electrode 4, an electrode 3, and an electrode 4 are provided in this order at 1, S2, S3, S4, and S5 so that discharge occurs in all the divided filters 9a to 9e. In this aspect, the other end 12b of the first ventilation cell 12
Since the plug member 15 is provided in the plug member 1,
5, a gap S5 is formed in the region before 5, and an electrode for the other end 12b is provided in the gap S5.

As shown in FIG. 4, the divided filters 9a to 9e are formed by dividing the honeycomb ceramic filter 9 into circular slices with a predetermined length interval d and partitioning the inside of the drum-shaped main body 20 into a lattice shape. A partition 11 is formed, and a large number of ventilation cells C having a length d are housed in the partition 11 in a bundled state.

Of the plurality of division filters 9a-9e,
The ventilation cells C of the divided filter 9a on the most distal side where the ventilation is first introduced are the second ventilation cells 13 whose opening ends are closed by the plug member 14 every other diagonally up and down in the diametrical direction.
And the first ventilation cell 12 which is not blocked. Similarly, the ventilation cell C in the rearmost divided filter 9e is also blocked by the plug member 15 (see FIG. 3), but in this divided filter 9e, the plug member 15 is blocked by the first ventilation. The cells 12 are the second ventilation cells 13 that are not blocked. The most advanced split filter 9a and the last split filter 9
There is an intermediate divided filter 9b, 9c, 9d in which the ventilation cell C is not blocked between e and e, and the ventilation cell C of these divided filters is the middle of the first ventilation cell 12 and the second ventilation cell 13. Make up part.

One end portion 1 of the first ventilation cell 12 on the exhaust gas inflow side
2a, a gap S1 between the adjacent divided filters 9a to 9e,
S2, S3, S4 and the other end 12b of the first ventilation cell 12
The electrodes 3 and 4 joined to (the gap S5 in FIG. 3 as described above) and the like are, as shown in FIG. 4, one annular conductor 21 and the ventilation member joined to the annular conductor 21. The cell C is composed of a plurality of cell-shaped electrodes 22 having substantially the same shape and size as the end surface shape of the cell C. Each of the cell-shaped electrodes 22 is integrally connected to the other cell-shaped electrodes at the corners, and is joined to the end surface of the first ventilation cell 12 with a heat-resistant adhesive.

Further, as shown in FIG. 5, the inner edge portion 22a of the cell-shaped electrode 22 is projected slightly inward from the inner surface of the first ventilation cell 12 as long as the flow resistance of exhaust gas is not increased. The electrodes 3 and 4 make it easy to energize the particulate matter 6 accumulated on the surface of the partition wall 11. On the contrary, the outer edge portion 22b of the cell-shaped electrode 22 is flush with the inner surface of the second ventilation cell 13 or slightly spreads outward, and the exhaust resistance of the second ventilation cell 13 does not increase. It is like this. In addition, the electrodes 3 and 4 correspond to the corresponding divided filters 9
Although it is joined to a to 9d with a heat resistant adhesive or the like,
The electrodes 3 interposed in the gaps S1, S2, S3, S4,
It suffices to connect 4 to either one of the divided filters.
In addition, as shown in FIG. 2, each of the electrodes 3 and 4 includes a conductive wire 23a,
A voltage is intermittently applied from the intermittent voltage applying means 5 installed outside the support tube 10 via 23b.

The intermittent voltage applying means 5 is composed of a power supply 16, a timer 17 and a transformer 18. The power supply voltage is changed to a predetermined voltage, and the electrodes 3 and 4 are energized and applied for a predetermined time. It has a function of stopping the supply of the supplied power to stop the power supply from the power supply 16 to the electrodes 3 and 4. Further, after a lapse of a predetermined time from the energization stop time, the timer 17 has a function of measuring the energization restart time and restarting the energization of the electrodes 3 and 4. In the present invention, the timer 17 is set as the energization restart time.
The required time is set to 0.2 seconds or more. The intermittent voltage applying means 5 is operated by sensing a decrease in the internal pressure of the first ventilation cell 12 or the flow velocity of exhaust gas, elapse of a certain period of time, or by manual operation.

2. Operation of Particulate Matter Removal Device (Particulate Matter Removal Method) (1) Removal of Particulate Matter from Exhaust Gas The particulate matter removal device configured as described above acts and exhibits its function as follows. . That is, in the exhaust pipe 8, the exhaust gas discharged from the diesel engine enters the support pipe 10 at a lower speed and diffuses, and at the same time, the second ventilation having one end closed by the plug member 14. Without entering the cell 13, as shown by the arrow X,
It enters into the first ventilation cell 12 which is open at one end. Partition wall 1 shared by the first ventilation cell 12 and the second ventilation cell 13
Since 1 is made of a ceramic porous body, as shown by an arrow Y, it passes through the partition wall 11 and passes through the second ventilation cell 13
Enters and is discharged downstream. The particulate matter 6 contained in the exhaust gas and discharged is the partition wall 1 of the first ventilation cell 12.
The passage is blocked by 1 and can be filtered.

(2) Regeneration of Ceramic Filter As shown in FIG. 6, first, it is determined whether or not the particulate matter 6 is deposited on the inner surface of the first ventilation cell 12 (S1 in FIG. 6, the same applies hereinafter. ). This judgment is made when the cumulative usage time of the ceramic filter exceeds the preset time,
When the gas pressure in the first ventilation cell 12 becomes lower than a predetermined value, when the flow velocity of exhaust gas becomes less than a predetermined value, and the like.
This can be done by setting arbitrary conditions. If the particulate matter 6 is deposited on the first ventilation cell 12, the intermittent voltage applying means 5 is driven to apply a predetermined voltage to the electrodes 3 and 4 (S2). Then, an energization path L1 is formed in the planar layer of the particulate matter 6 between the electrodes 3 and 4 (S
3), the particulate matter 6 along the energization path L1 burns (S4).

As the particulate matter 6 near the energizing path L1 burns, an arc discharge 7 occurs, forming the path L2. Therefore, it is confirmed whether or not the arc discharge path L2 is formed. When the particulate matter 6 burns and the arc discharge 7 occurs, the voltage between the electrodes 3 and 4 may fluctuate or noise may be generated. By measuring them, it is confirmed whether or not the arc discharge path L2 is formed. Can (S
5). By inputting the sensing information from the sensing means (not shown) to the intermittent voltage applying means 5, the means 5 is stopped (S6). When the intermittent voltage applying means 5 is stopped, the elapsed time after the timer 17 is stopped is measured (S
7). Then, it is confirmed whether or not the energization restart time preset in the timer 17 has been reached (S8).

In the case of the present invention, a predetermined time of at least 0.2 seconds is ensured before it is necessary to restart energization.
In order for arc discharge path L2 to completely recover the insulation state,
The above predetermined time is preset in the timer 17.
When the arc discharge path L2 recovers the insulation state, the timer 1
When the start information is transmitted to the intermittent voltage applying unit 5, the predetermined voltage is applied to the electrodes 3 and 4 (S9). During that time, the atmospheric temperature raised by the arc discharge 7 decreases and the ions and radicals in the first ventilation cell 12 dissipate. Therefore, the arc discharge 7 does not occur in the arc discharge path L2. As a result, the partition wall 11 is formed between the electrodes 3 and 4.
A new energization path L3 is formed in the planar layer of the particulate matter 6 that is still present above. In the same manner thereafter, the purification region of the particulate matter 6 is non-locally expanded on the surface of the partition wall 11 in the first ventilation cell 12, and the honeycomb ceramic filter 9
The entire purification becomes possible. However, after purification, new particulate matter 6 may accumulate in the first ventilation cell 12 and the purification of the honeycomb ceramic filter 9 may not be completed. Therefore, it is confirmed (S10), and if the purification is not completed. In this case, the operation of the above steps is repeated.

3. Effects of Particulate Matter Removal Method and Particulate Matter Removal Device Such a particulate matter removal method and particulate matter removal device are provided by applying an electric current to the particulate matter to generate heat or to generate heat of arc discharge. Substances can be incinerated and removed. In addition, the power supply is intermittently supplied, and the non-discharge period is set to be a predetermined time or more at which the insulation on the discharge path immediately before is restored, so that not only the particulate matter in a part of the ceramic filter is removed but also the lower layer portion and the porous layer Particulate matter can be removed even in areas that are difficult to remove, such as inside
There can be no removal omissions. Furthermore, by setting the non-discharge period to a constant time, the intermittent voltage applying means can be easily configured.

4. Experimental Example Next, a basic experiment was conducted to grasp the above-mentioned energization restart time. In this experiment, as shown in FIG. 7, a filter paper 111 made of silica corresponding to the partition wall 11 of the first ventilation cell 12 was laid on a setter 19 made of porcelain, and the particulate matter 6 was further placed thereon.
Carbon black 6a corresponding to the above was sprayed on one surface. The carbon black 6a had an average particle size of 44 μm.

Further, a pair of carbon electrodes 3 and 4 each having a length of 36 mm were arranged in parallel on the carbon black 6a with a separation distance of 6 mm. And 6 to the electrodes 3 and 4
The voltage of kv, the first energization time (ON time) is 0.58
The energization path L1 described above is set by changing the energization restart time (OFF time) for restarting the energization again after the energization is stopped by setting the voltage for 1.3 seconds, 2.5 seconds, and 5.7 seconds. The combustion state of the carbon black 6a in the vicinity and the arc discharge state in the arc discharge path L2 were observed. The results are shown in Table 1. As is clear from Table 1, it could be confirmed that the discharge arc moved and disappeared when the OFF time was set to 0.2 seconds or more.

[0032]

[Table 1]

It should be noted that the present invention is not limited to the above-described embodiments, but various modifications can be made within the scope of the present invention according to the purpose and application. That is, the cross-sectional shape of the first ventilation cell 12 and the second ventilation cell 12 may be a hexagonal shape as shown in FIG. 8, or a circular shape or a triangular shape. Further, the partition wall 11 may be loaded with a platinum or palladium catalyst that contributes to purification of exhaust gas. Further, as shown in FIG. 9, the divided filters 9a to 9e are made into half halves from a cylindrical shape to form half halves having a semicircular end face, or further divided as shown in FIG. It is also possible to use a vertically-divided filter that becomes the end face of a circle.

[0034]

According to the particulate matter removing method of the first aspect, the particulate matter accumulated in the honeycomb ceramic filter can be removed without leakage by intermittent arc discharge. Further, as described in claim 2, the circuit configuration can be facilitated by setting the intermittent time to a predetermined time. According to the particulate matter removing device of the third aspect, the particulate matter removing device with less clogging by the particulate matter can be provided. Moreover, the circuit configuration can be facilitated by setting the intermittent time to a predetermined time.

[Brief description of drawings]

FIG. 1 is a conceptual diagram illustrating a technical idea of the present particulate matter removing apparatus.

FIG. 2 is a partially cutaway side view showing an apparatus according to the present particulate matter removing apparatus.

FIG. 3 is a partially cutaway perspective view of a honeycomb ceramic filter according to the present particulate matter removing apparatus.

FIG. 4 is a perspective view for explaining the configuration of a split filter.

FIG. 5 is a partially enlarged cross-sectional view for explaining an arrangement structure of electrodes.

FIG. 6 is a flowchart illustrating an embodiment of the present particulate matter removal device.

FIG. 7 is a side view of the basic experimental device.

FIG. 8 is a partial front view illustrating another aspect of the ventilation cell.

FIG. 9 is a perspective view for explaining the configuration of a split filter of another aspect.

FIG. 10 is a perspective view for explaining the configuration of a split filter of another aspect.

[Explanation of Codes] 3, 4; Electrodes, 5; Intermittent Voltage Applying Means, 6; Particulate Matter, 7; Arc Discharge, 8; Exhaust Pipe, 9; Honeycomb Ceramic Filters, 9a, 9b, 9c, 9d; Division Filter, 10; support tube, 11; partition wall, 12; first ventilation cell,
12a; one end, 12b; the other end, 13; second ventilation cell, 14; plug member, 15; plug member, 16; power supply, 17;
Timer, 18; transformer, 19; setter, L1; energization path, L2; arc discharge path, L3; energization path.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3G090 AA02 BA01 CA00 DA00 DA09                 4D019 AA01 BA05 BB06 BC12 CA01                       CB09                 4D058 JA32 JB06 KB12 MA42 MA54                       SA08 TA06                 4G075 AA27 AA37 AA42 AA61 BA06                       CA17 EC21 EE33 FA14 FB04

Claims (9)

[Claims] 1. A method of removing particulate matter trapped in a partition of a ceramic filter, the interior of which is partitioned by a partition 11 made of porous ceramic, wherein both ends and / or the longitudinal direction of the ceramic filter are removed. A pair of electrodes 3 and 4 are provided at arbitrary intervals, and discharge is intermittently generated between the electrodes to incinerate and remove the particulate matter on the path of the discharge. A method for removing particulate matter, characterized in that the time is longer than the time when the insulation on the discharge path is restored. 2. The method for removing particulate matter according to claim 1, wherein the time is a predetermined time and is 0.2 seconds or more. 3. A honeycomb ceramic filter 9 having an interior partitioned by a partition wall 11 made of a porous ceramic and a plurality of elongated ventilation cells C bundled in the interior is provided in the middle of an exhaust pipe 8 of an exhaust source. The ventilation cell C is provided with a first ventilation cell 12 having one end opened and the other end closed, and a partition shared with the partition of the first ventilation cell and having one end closed and the other end open. The second ventilation cell 13 is provided, and the exhaust gas discharged from the exhaust gas generation source is caused to flow from the first ventilation cell to the second ventilation cell, whereby the particulate matter in the exhaust gas is separated by the partition wall 11. The pair of electrodes 3 and 4 are arranged so as to be able to be captured and to be directly opposed to each other at a predetermined distance d in the longitudinal direction of the first ventilation cell 12.
A particulate matter removing device characterized in that a voltage can be intermittently applied to the electrode from the intermittent voltage applying means 5. 4. The honeycomb ceramic filter 9 described above.
Is provided with gaps S1, S2, S3, S4, S5 for disposing the electrodes 3, 4 at a predetermined distance d in the longitudinal direction, and one of the electrodes 3, 4 is provided in the gap. The particulate matter removing device according to claim 3, which is provided so as to be opposite to the other electrode. 5. The honeycomb ceramic filter 9 described above.
The particulate matter removal device according to claim 3 or 4, wherein is composed of a plurality of vertically splittable filters that can be split vertically. 6. The electrodes 3, 4 have substantially the same shape and size as the end face of the honeycomb-shaped ceramic filter 9, and have an annular conductor 21 and a plurality of cell-shaped electrodes provided in the annular conductor 21. The particulate matter removing device according to any one of claims 3 to 5, wherein the particulate matter removing device includes a connecting body formed by connecting 22 in a planar shape. 7. The inner edge portion 22a of the cell-shaped electrode 22 is
While projecting slightly inward from the inner surface of the first ventilation cell 12, the outer edge portion 22b of the cell-shaped electrode 22 has no step with the inner surface of the second ventilation cell 13 or is outward from the inner surface. The particulate matter removing device according to claim 6, which has a shape that slightly expands. 8. The intermittent voltage applying means 5 includes at least a power supply 16 and a timer 17, and the timer is
While stopping the energization of the electrodes from the power source,
8. The particulate matter removing device according to claim 3, wherein energization of the electrode is resumed from the power source after a lapse of a predetermined time. 9. The particulate matter removing device according to claim 8, wherein the predetermined time is 0.2 seconds or more.