JPH1193638A - Exhaust gas filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the cleaning and elimination of the fine solid material caught by filters by arranging plural filters for eliminating the fine solid material included in the exhaust gas along the circumferential direction so as to be rotated by a driving device, and providing a nozzle device for injecting the high-temperature washing gas to the filters. SOLUTION: At the time of eliminating the fine solid material caught by plural honeycomb ceramics filter 1, a motor 25 is driven so as to rotate a nozzle device 40 and move an opening part 9c of a tube 9 of the nozzle device 40 to a position facing to a filter 1 for cleaning as a first time. High-temperature gas from a gas supplying device 29 is blown to the filter 1 from an injection hole 9b of a nozzle plate 9 through a gas passage 7a inside of a shaft 7 and tubes 8, 9 so as to burn the fine solid material caught by the filter 1. After eliminating the fine solid material caught by one filter 1, the motor 25 is driven again so as to rotate the shaft 7 and the nozzle device 40, and the nozzle device 40 is stopped at a position corresponding to other filter 1 to be cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of filtering exhaust gas discharged from a boiler installed in a diesel engine used as a power source of a power generator, a ship, a vehicle, or the like, or a power plant or an industrial plant. The present invention relates to an exhaust gas filtration device that removes fine solids such as soot in a gas to prevent the emission of black smoke.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional exhaust gas filtering apparatus for filtering exhaust gas from a diesel engine mainly used in a power generator to remove fine solids such as soot in the exhaust gas. Is shown. In FIG. 2, reference numeral 2 denotes a case of such an exhaust gas filtering apparatus, in which a honeycomb ceramic filter 1 made of a ceramic material and through which exhaust gas can flow is housed.

On the side of the case 2, an exhaust gas inlet 4 is provided below the honeycomb ceramic filter 1, and an exhaust gas outlet 5 is provided above the filter 1, and at the bottom of the case 2, , A soot collecting box 13 communicating with the inside of the case 2 is provided. Reference numeral 14 denotes a heater provided in the soot collection box. Reference numeral 15 denotes a high-pressure air pipe provided above the honeycomb ceramic filter 1 in the case 2 and through which high-pressure air is introduced. A plurality of air injection nozzles 17 are opened below the high-pressure air pipe 15 so as to face the honeycomb ceramic filter 1.

When the exhaust gas filtering device is operated, exhaust gas from a diesel engine (not shown) flows into the case 2 from an exhaust gas inlet 4 and flows as indicated by an arrow in FIG. Flows from below to above, and fine solid matter such as soot is captured in the filter 1. The exhaust gas thus purified is sent from the exhaust gas outlet 5 to a discharge section such as a chimney.

On the other hand, the soot 102 collected by the honeycomb ceramic filter 1 is separated from the filter 1 by causing high-pressure air to be jetted toward the filter 1 from an air injection nozzle 17 of the high-pressure air pipe 15. Let it fall. The fallen soot 102 is stored in the soot collection box 13 and then incinerated by the heater 14.

[0006]

In the exhaust gas filtering apparatus according to the prior art shown in FIG. 2, the soot captured by the honeycomb ceramic filter 1 as described above is supplied to the nozzle 1 of the high-pressure air pipe 15 through the filter 1. And high pressure air is blown therefrom to separate them by the air pressure. For this reason, a situation in which the high-pressure air is not uniformly blown to the honeycomb ceramic filter 1 or the air pressure of the high-pressure air is insufficient tends to occur, whereby the removal of the soot 102 in the filter 1 becomes incomplete and The pressure loss due to clogging of the filter increases, and it is observed that the filter 1 is damaged or the output of the engine is reduced.

Further, in the conventional technique, since the filter 1 is cleaned using high-pressure air, equipment such as a compressor and an air tank for generating high-pressure air is required, and the soot 102 is incinerated. The heater 14 is required, which increases the size of the apparatus and increases the cost.

SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention completely cleans and removes fine solids such as soot captured by a filter, thereby preventing clogging of the filter and extending the life of the filter. It is a first object of the present invention to provide an exhaust gas filtering device that can be extended and can prevent an increase in pressure loss and a decrease in engine output due to the occurrence of such clogging. It is a second object of the present invention to provide an exhaust gas filtration device that is reduced in size and cost, by eliminating the need for special equipment for generating high-pressure air and removing soot as in the prior art. And

[0009]

According to the present invention, an exhaust gas is passed through a filter housed in a case to remove fine solids containing soot in the exhaust gas. In the exhaust gas filtering device as described above, a plurality of the filters are arranged along the circumferential direction, and a rotating body having a gas passage through which a high-temperature cleaning gas flows is driven by rotation by a driving device; A nozzle device attached to the outer periphery of the body, communicating with the gas passage, facing the filter by rotation of the rotating body, and ejecting the high-temperature cleaning gas passing through the gas passage to the filter. We propose an exhaust gas filtration device.

According to a second aspect of the present invention, in the first aspect, the rotating body is supported by the case via a bearing, and the nozzle device is mounted on an outer periphery of the rotating body. A gas pipe in which a gas passage extending radially and communicating with a gas passage of the rotating body is formed,
A gas passage is provided on the outer peripheral side of the gas pipe and communicates with the inside of the gas pipe. The high-temperature cleaning gas passing through the gas passage is jetted toward the filter to burn the fine solids. And a nozzle.

In the second aspect of the present invention, preferably, the nozzle includes a nozzle plate provided with a large number of injection holes for discharging the gas in opposition to the filter.

[0012] A third invention is a further embodiment of the first and second inventions. In the first and second inventions, the plurality of filters are supported by a filter case fixed to an inner wall of the case. By the filter case, the inside of the case is partitioned into an exhaust gas inlet chamber and an outlet chamber, and the rotating shaft of the rotating body is penetrated into the filter case, and is supported by the filter case via a bearing. The nozzle device is disposed in the inlet chamber, and gas ejected from the nozzle device toward the filter and solid matter in the filter are discharged into the outlet chamber.

According to the first to third aspects of the present invention, when cleaning the filter, the nozzle device attached to the rotatably driven rotator is rotated around the rotary shaft, so that the nozzle device is disposed in the case along the circumferential direction. A high-temperature cleaning gas is blown from the nozzle device to the filter so as to face one of the plurality of filters. As a result, most of the fine solid matter such as soot captured by the filter is incinerated by the high-temperature gas blown from the nozzle device, or part of the fine solid matter that is not incinerated falls to the lower part of the case. When the removal of the fine solids from one filter is completed, the rotating body is rotated to make the nozzle device face the next filter, and the filter is cleaned in the same procedure as described above. Such a procedure is repeatedly and continuously performed for each filter.

Therefore, according to this invention, the nozzle device attached to the rotating body is rotated, the nozzle device is opposed to each of the plurality of filters, and high-temperature cleaning gas is blown onto the filters. Since fine solids such as soot that have been captured are incinerated, solids inside each filter are completely removed, and clogging of the filters is reliably prevented.

In addition, as a high-temperature cleaning gas, factory steam or steam generated in a plant can be used after being superheated.
No special cleaning gas production equipment is required, and
Since the solid matter in the filter is directly incinerated by the high-temperature gas, a heater as in the related art is not required, so that the size of the apparatus is reduced and the cost is reduced. Furthermore, since the structure is simple, light, and has a structure in which a small rotating body and a nozzle are rotated, a rotating drive device can be small in size and small in capacity, and the bearing capacity is small.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a longitudinal sectional view of an exhaust gas filtering device for a diesel engine according to an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a case of such an exhaust gas filtering apparatus, which is provided with an exhaust gas inlet 4 and an exhaust gas outlet 5 on both sides in the longitudinal direction. At a substantially central portion of the case 2, a filter case 30 is provided with its periphery fixed to the inner wall of the case 2, and the inside of the case 2 is partitioned into an inlet chamber 27 and an outlet chamber. The filter case 30 includes partition walls 3, 3 arranged at regular intervals (intervals corresponding to the length of the filter 1 described later) in the longitudinal direction (axial direction of the shaft 7 described later).
In between, a tubular body 30a for housing the filter 1 is
A plurality of both ends are fixed to the partition walls 3, 3 and are provided at equal intervals in the circumferential direction.

Reference numeral 1 denotes a honeycomb ceramic filter made of a ceramic material, through which exhaust gas can flow, and as described above, the cylindrical body 3 of the filter case 30 is formed.
0a, and both end surfaces are open to the entrance chamber 27 and the exit chamber 28. Reference numeral 7 denotes a rotationally driven shaft.
Bearings 10a, 10a are attached at both ends to the boss portions 2a, 2b of the case 2.
c, and the center is the filter case 30
Through the center of the filter case 30 and the bearing 10b
Is supported through. Reference numeral 25 denotes an electric motor (which may be a hydraulic motor) that rotationally drives the shaft 7, and reference numeral 26 denotes a motor control device that controls the start / stop and rotation speed of the motor 25.

A gas passage 7a is formed in a portion of the shaft 7 opposite to a portion where the motor 25 is connected. 2
Reference numeral 9 denotes a gas supply device that supplies and shuts off the high-temperature gas. The high-temperature gas that has passed through the gas supply device 29 can flow into the gas passage 7a of the shaft 7 via the pipe 6. Reference numeral 8 denotes a pipe attached to a portion of the shaft 7 facing the inlet chamber 27. The pipe 8 extends in a radial direction from a portion where the shaft 7 is mounted, and the inside of the pipe 8 is connected to a gas passage 7a of the shaft 7. Are in communication.

A tube 9 is fixed to the outer peripheral end of the tube 8 in a direction perpendicular to the tube 8. The tube 9 has substantially the same shape as the filter 1 so that an opening 9 c having substantially the same shape as the opening on the inlet chamber 27 side of the honeycomb ceramic filter 1 faces one of the filters 1 by rotation of the shaft 7. The bottom portion is covered with a cover 9d. 9a is a nozzle plate fixed to the pipe 9,
A large number of injection holes 9b for hot gas injection are formed. The nozzle device 40 is constituted by the pipe 8, the pipe 9, the nozzle plate 9a and the like.

When the exhaust gas filtering apparatus having such a configuration is operated, the exhaust gas from the diesel engine (not shown) flows from the exhaust gas inlet 4 into the inlet chamber 27 of the case 2 and as shown by the arrow in FIG. And flows in the plurality of honeycomb ceramic filters 1 arranged at equal intervals in the circumferential direction in the longitudinal direction (axial direction of the shaft 7), and fine solids such as soot are captured in each filter 1. . The exhaust gas thus purified is supplied from the outlet chamber 28 to the exhaust gas outlet 5.
After that, it is discharged to a discharge section such as a chimney.

When removing fine solids such as soot captured by each honeycomb ceramic filter 1 as described above, the motor 25 is driven by the motor control device 26, the shaft 7 is rotated, and the nozzle device is removed. The opening 9c of the tube 9 is rotated to the position where the filter 1 to be cleaned first and the position in the radial direction and the circumferential direction match, and the motor 25 is stopped at this position. Next, the gas supply device 2
9 is opened and a high-temperature gas containing oxygen, which is sufficiently hot to burn soot, is ejected from the pipe 6 into the gas passage 7 a in the shaft 7. The high-temperature gas enters the pipe 9 via the gas passage 7a and the inside of the pipe 8, and is blown to the filter 1 from the injection holes 9b of the nozzle plate 9a.

Since the high-temperature gas has a temperature sufficient to burn soot and contains oxygen, fine solids such as soot captured in the filter 1 are greatly increased by ejecting the high-temperature gas. Parts are incinerated. The remaining solid matter is blown off from the filter 1 by the jet pressure of the high-temperature gas, and falls and accumulates at the bottom of the case 2. After the removal of fine solids from one filter 1 by the above-described procedure is completed, the motor 25 is started again to rotate the shaft 7 and the nozzle device 40 and stop at a position facing the filter 1 to be cleaned next. By repeating such an operation by the number of filters 1, fine solids such as soot are uniformly removed in each filter 1.

[0024]

As described above, according to the present invention, by rotating the nozzle device attached to the rotating body, the nozzle devices are opposed to each other for a plurality of filters, and the high-temperature cleaning gas is applied to the filters. Because fine solids such as soot captured by the filter are incinerated by spraying,
The solid matter captured by each filter can be completely removed, whereby the occurrence of filter clogging can be reliably prevented. Therefore, it is possible to prevent an increase in pressure loss and a decrease in output of the engine accompanying the occurrence of the clogging, and to extend the life of the filter.

In addition, as a high-temperature cleaning gas, factory steam or steam generated in a plant can be used after being superheated.
Since no special gas production equipment is required, and the solid matter in the filter is directly incinerated by the high-temperature gas, a conventional heater is not required, and the apparatus is reduced in size and cost is reduced.

Further, since the structure is simple and light and small, the structure for rotating the rotating body and the nozzle is rotated, the driving device for rotation can be reduced in size and capacity, and the bearing capacity can be reduced. Cost is reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an exhaust gas filtering device for a diesel engine according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an exhaust gas filtering device according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramic filter 2 Case 3 Partition wall 4 Exhaust gas inlet 5 Exhaust gas outlet 6 Tube (for high-temperature gas inlet) 7 Shaft 7a Gas passage 8 Tube (for nozzle device) 9 Tube (for nozzle device) 9a Nozzle plate 9b Injection hole 9c Openings 10a, 10b, 10c Bearing 25 Motor 26 Motor control device 27 Inlet chamber 28 Outlet chamber 29 Gas supply device 30 Filter case 30a Tubular body 40 Nozzle device

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI B01D 46/42 B01D 46/42 B

Claims (4)

[Claims] 1. An exhaust gas filtering apparatus in which an exhaust gas is caused to flow through a filter housed in a case to remove fine solids including soot in the exhaust gas, wherein the filter has a circular shape. A rotating body having a gas passage through which a high-temperature cleaning gas flows while being arranged in a plurality along the direction and rotated by a driving device, and attached to the outer periphery of the rotating body and communicated with the gas passage; An exhaust gas filtering device, comprising: a nozzle device for discharging the high-temperature cleaning gas that has passed through the gas passage to the filter while being opposed to the filter by rotation of the rotating body. 2. A gas passage, wherein the rotating body is supported by the case via a bearing, and the nozzle device is attached to an outer periphery of the rotating body, extends in a radial direction, and communicates with a gas passage of the rotating body. Has a gas pipe formed therein, and a gas passage attached to an outer peripheral side of the gas pipe and communicated with the inside of the gas pipe, and ejects the high-temperature cleaning gas passing through the gas passage toward the filter. The exhaust gas filtering device according to claim 1, further comprising a nozzle for burning the fine solid. 3. The exhaust gas filtering device according to claim 2, wherein the nozzle includes a nozzle plate provided with a plurality of injection holes for discharging the gas so as to face the filter. 4. The filter is supported by a filter case fixed to an inner wall of the case. The filter case partitions the inside of the case into an exhaust gas inlet chamber and an exhaust gas outlet chamber. The rotating shaft of the rotating body penetrates through the case and is supported on the filter case via a bearing. The nozzle device is disposed in the inlet chamber and the gas ejected from the nozzle device toward the filter and the solid matter in the filter are provided. The exhaust gas filtering device according to any one of claims 1 to 3, wherein the exhaust gas is configured to be discharged into the outlet chamber.