JPH0783810B2 - Filter element, filter body, and filter device - Google Patents

Description

[Technical Field] The present invention is mainly applied to trap or remove fine particles contained in exhaust gas of a diesel engine used for various vehicles, ships and industrial equipment. The present invention relates to a suitable plate-shaped filter element, a filter body formed by stacking the filter elements, and a filter device incorporating the filter body.

“Prior art and its problems” Exhaust gas from diesel engines contains a considerable amount of fine particles containing carbon as a main component, which causes pollution. Therefore, various devices have been proposed for collecting and removing fine particles contained in diesel engine exhaust gas using a filter body.

Japanese Unexamined Patent Publication No. 56-124417 discloses a ceramic filter body 20 as shown in FIG. This filter body 20
Has a rectangular parallelepiped outer shape as a whole, and a plurality of (8 in FIG. 9) rectangular plate-like bodies 21 and 22 parallel to each other and ribs.
23, 25 and ribs 24, 26 located in the middle part.

Plates 21, 22, ribs 23, 25 and ribs located in the middle
Each of 24 and 26, or at least the plate-like body 22 is made of a gas permeable porous thin wall of ceramic having a filter function. The plate-like body 21 forms an upper surface and a lower surface of the filter body 20, and the plate-like body 22 forms an intermediate surface. Between adjacent plate-like bodies 21, 22 or between 22, 22, both ribs 23 located at the ends and ribs 24 located at the intermediate portion extend in parallel to one side of the plate-like bodies 21. The upper edges of the ribs 23, 24 are integrally contacted with the upper plate-like body 21 or 22, and the lower edges of the ribs 23, 24 are the lower plate-like body 22 or.
It is in contact with 21. As a result, a plurality of dust-containing gas passages 27 whose both ends are open are formed. Such ribs 23, 24 are provided on one side of the plate-like body 22, while ribs 25, 26 extending in a direction orthogonal to the ribs 23, 24 are provided on the other side of the same plate-like body 22. Is provided. Ribs 25 and 26 are essentially similar to ribs 23 and 24, respectively, except that the directions are orthogonal. Thus, a plurality of stages of the clean gas passages 28 whose both ends are open and whose extending direction is orthogonal to the stages of the dust-containing gas passage 27 are formed alternately.

In this filter body 20, of the two end faces where the dust-containing gas passage 27 opens, one end face side directly or indirectly closes all the openings of the dust-containing gas passage 27, and the other end face of the diesel engine Introduce exhaust gas. Alternatively, the diesel engine exhaust gas is simultaneously introduced inward from both open end faces of the dust-containing gas passage 27. The plate-like body 22 serves as a filter wall, the fine particles are collected on the surface of the plate-like body 22 on the dust-containing gas passage 27 side, and the clean gas from which the fine particles are removed is the plate-like body 22.
Through the clean gas 28 to flow out of the filter body.
The collected particulates in the exhaust gas of the diesel engine, which are mostly carbonaceous, heat and burn off the plate-shaped body 22 at appropriate time intervals to regenerate the filter body 20.

In such a prior art, the plate-like body 22 having a filter function is used.
Is heated to the combustion starting temperature of the carbonaceous fine particles, and the collected fine particles are burned and removed. However, since the plate-shaped body 22 is repeatedly exposed to a high temperature when the particles are burned and removed, the initial pore size distribution changes due to the progress of sintering of the plate-shaped body and during the particle collection operation. The gas passage pressure loss increases, it is difficult to maintain stable performance as a filter body, and the plate-shaped body 22 may be melted by the high temperature of combustion removal, which causes a problem that particulates cannot be substantially collected. There is.

In addition to the carbonaceous fine particles, a non-negligible amount (for example, 1 to 5% of the total weight of the fine particles) of non-combustible components is contained in the exhaust gas of the diesel engine and is simultaneously collected by the filter body. Furthermore, the diesel engine exhaust gas contains SOx and NOx components, and these components react with the substances that make up the exhaust gas pipeline and the substances that make up the filter body, producing non-combustible solids and producing a filter body. Deposit inside. Since these non-combustible solids are not removed by combustion, they accumulate in the filter body and cause clogging, which deteriorates the performance of the filter body.

Further, Japanese Patent Laid-Open No. 225721/1984 discloses a dust remover for removing high-temperature dust-containing gas using a filter tube. In this dust removing device, a plurality of vertically arranged filter tubes are used, and the dust-containing gas is introduced into the filter tube from above the filter tubes. The dust blocked by the filter tube wall is moved to the lower side of the filter tube and collected in the dust hopper provided on the lower side of the filter tube, and the clean gas passing through the filter tube wall is fed from the side of the filter tube. It is taken out of the filter device. The above dust removal device can be understood as a device suitable for dust gas containing a large amount of air and mainly incombustible dust, such as dust removal treatment of converter gas in a steel mill, and there is no suggestion of application to diesel engine exhaust gas. . In this method, it is easy to manufacture a filter tube, but it takes time and effort to fix a large number of thin filter tubes to a tube plate at intervals with each other to form a compact filter body. There is a problem that there is an assembling process and it is not easy to manufacture a filter body having a large treatment amount.

Therefore, in order to solve these problems, the applicant
A filter device as shown in Fig. 10 has already been proposed (Japanese Patent Application No. 62-232232).

As a typical example thereof, a rectangular parallelepiped filter body 33 which is essentially the same as the filter body shown in FIG. 9 is used, and the filter body 33 is provided inside the casing 31 having openings on the upper side, the lower side and one side. The filter body is fixed via the sealing member 32 of the filter body 33, and the filter body 33 intersects the dust-containing gas passage 34 (shown by a solid arrow in the figure) penetrating from the upper side to the lower side and closes one end thereof. A clean gas passage 35 (shown by a broken line arrow in the drawing) whose other end is opened laterally is partitioned by a plate-like body 22 made of a gas permeable porous material.

A diesel engine exhaust gas introduction pipe 37 is provided above the casing 31. An exhaust gas introduction pipe 38 is connected to a side of the casing 31 where the clean gas passage 35 of the filter body is opened. Exhaust gas outlet pipe 38 has a reduced throat
39, and the diameters of the upstream and downstream are gradually expanded. An ejector nozzle 40 for injecting a pressurized gas for backwashing operation is provided near the downstream end of the throat portion 39 and opens toward the upstream side of the filter body. A fine particle receiving portion 41 is provided below the casing 31. The particle receiving portion 41 is a tray 42, a filter plate 43 including an electric resistance heater 46,
It has an ash extraction port 44 and a gas outlet 45 with a lid 47 that can be opened and closed and is normally closed.

The filter plate 43 is fitted by hollowing out the bottom of the tray 42, and the tray 42 and the filter plate 43 surround the lower open end of the dust-containing gas passage 34 of the filter body 33 as a whole. The ash extraction port 44 opens at the bottom of the tray 42, and a gas outlet 45 is provided below the filter plate 43. Filter plate
The ventilation resistance of 43 is 20% or less of the total amount of exhaust gas introduced from the exhaust gas introduction pipe 37, particularly about 0.5 to 5% passes through the filter plate 43, and the rest is the plate-like body of the filter plate 33.
It is selected to pass through 22 and be taken to the exhaust gas outlet pipe.

Diesel engine exhaust gas is introduced into the dust-containing gas passage 34 of the filter body 33 from the upper open end thereof through the introduction pipe 37. Most of the gas components of the exhaust gas pass through the porous plate-like body 22 to become clean gas and flow out to the exhaust gas outlet pipe 38 through the clean gas passage 35, but the fine particles in the exhaust gas are plate-like bodies.
At the same time as being captured by 22 and adhering and depositing on the wall surface on the dust-containing gas passage 34 side, some of the fine particles flow out to the fine-particle receiving portion 41 from the lower opening end of the dust-containing gas passage 34 together with a part of the exhaust gas.
The gas component of the exhaust gas that has flowed into the particle receiving portion 41 passes through the filter plate 43 and is guided to the gas outlet 45, but again, almost all of the particles in the exhaust gas are captured by the filter plate 43 and the filter plate 43. Deposits on the inner surface of the.

After such dust collection operation is continued for an appropriate time, the ejector nozzle 40
A backwashing operation is performed in which pressurized gas, especially pressurized air, is jetted for a time of, for example, about 0.1 to 1 second. The injected gas attracts the gas around the nozzle 40, and a gas of several times the amount of the pressurized gas that has been injected enters the cleaning gas passage 35 as a pulse flow and passes through the porous plate-shaped body 22. Flow to the dust-containing gas passage 34. At that time, the fine particles that have adhered and accumulated on the wall surface on the dust-containing gas passage 34 side are peeled off, and a part thereof floats in the dust-containing gas passage 34, but most of them fall into the fine particle receiving portion 41. In the particle receiving portion 41, almost all of the particles that have fallen along with the flow of gas passing through the filter plate 43 adhere and accumulate on the inner surface of the filter plate 43.

Thus, in the dust collecting operation, the fine particles captured on the wall surface on the dust-containing gas passage 34 side are transferred to the inner surface of the filter plate 43 in the backwashing operation, and the filter function of the filter body 33 is reproduced. The fine particles on the inner surface of the filter plate 43 are heated by the electric resistance heater 46 and burned and removed.

When the filter body is used for a relatively long time, the fine particle receiving portion 41,
In particular, since incombustible fine particles, ash, etc. are accumulated on the inner surface of the filter body 43, the lid 47 is opened to allow the fine particles and ash to spontaneously drop, or forcibly discharged by an appropriate scraping mechanism.

However, in this filter device, when the gas flows into the cleaning gas passage 35 in a pulsed flow during repeated backwashing operations, the inside of the cleaning gas passage 35 is momentarily at a considerably high pressure, for example, 0.3 to 0.4 kg / cm ^2. There is a problem in that the plate-like body 22 is often damaged due to repeated bending stress acting on the plate-like body 22 that divides the clean gas passage 35 and the dust-containing gas passage 34 of the filter body 33 due to a certain gas pressure.

Further, in the conventional filter body shown in FIG. 9, since the structure as a whole is extremely complicated, it takes time and labor for manufacturing, and there is a problem that the rate of defective products is high.

"Object of the invention" In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a filter element having a structure capable of sufficiently withstanding bending stress repeatedly generated by the pressure of the backwash airflow during the backwash operation of the filter body. Realize, by providing a plate body by laminating this plate-shaped filter element, to provide a filter body that is easy to manufacture and has a good yield,
Another object of the present invention is to provide a filter device using this filter body.

"Structure of the invention" The filter element according to the present invention has a plurality of holes penetrating the plate-shaped body from one end face of the pair of opposed end faces of the plate-shaped body made of a gas permeable porous material to the other end face. The plate-like filter element is characterized in that the inner wall surfaces of the plurality of holes are mountain-shaped toward the adjacent side wall surfaces.

As a preferred aspect of the present invention, the side wall surface of the plate-shaped body is a quadrilateral, and further, the cross-sectional shape of the plurality of holes cut by a plane perpendicular to the center line of the plurality of holes is circular. ,
It is a plate-shaped filter element that is one selected from an oval shape and a polygonal shape of a quadrangle or more.

As another preferred aspect of the present invention, the center lines of the plurality of holes are substantially straight lines and are substantially parallel to each other, and further, the plurality of holes are opened substantially in line on the facing end faces. It is a plate-shaped filter element that is operating.

As still another preferred aspect of the present invention, a plate-shaped filter element in which ribs projecting toward the side wall surface adjacent to the end surface and extending along the respective opposing edges of the plate-shaped body are formed. Is.

In another preferred embodiment of the present invention, the material forming the plate state is ceramics, and a plate-like material made of a gas permeable porous material that is a sintered metal or a porous glass depending on the type of dust-containing gas to be processed. It is a filter element.

The filter body according to the present invention, a plurality of holes are formed through the plate-shaped body from one end face of the pair of opposed end faces of the plate-shaped body made of a gas permeable porous material to the other end face,
Inner wall surfaces of the plurality of holes are respectively plate-shaped filter elements that are mountain-shaped toward the side wall surface of the plate-shaped body,
A plurality of sheets are laminated in parallel so as to be aligned with the end face, and the plurality of holes between the filter elements are filter bodies that form another passage defined by the porous wall of the plate-like body, Is a filter body configured such that the another passage opens on both sides having a pair of adjacent end faces different from the pair of end faces facing each other in which the plurality of holes of the plate-shaped body are opened.

As a preferred aspect of the filter body of the present invention, a plurality of plate-shaped filter elements having ribs formed to extend along the edges of the pair of opposed end faces and projecting toward the side wall surface adjacent to the end faces are laminated in parallel. However, the plurality of holes between the filter elements are formed by the ribs, and the plurality of holes constitute another passage having a width substantially equal to the protruding width of the ribs defined by the porous wall of the plate-shaped body. .

As another preferred embodiment of the filter body of the present invention, the filter elements are laminated with a spacer interposed therebetween, and the spacer divides the plurality of holes by the porous wall of the plate-like body. Is a filter body forming another passage having a width substantially equal to the thickness of the filter.

The filter device of the present invention, a plurality of holes are formed through the plate-shaped body from one end face of the pair of opposed end faces of the plate-shaped body made of a gas permeable porous material to the other end face,
Inner wall surfaces of the plurality of holes are plate-shaped filter elements each forming a mountain shape toward the side wall surface of the plate-shaped body,
A plurality of sheets are laminated in parallel so that the end faces are aligned, and the plurality of holes constitute another passage defined by the plate-like porous wall between the filter elements, and the another passage is A filter body configured to open on both sides of a pair of adjoining end faces different from the pair of end faces facing each other in which a plurality of holes of the plate-like body are opened, and the filter body is a dust-containing gas. The filter device is fixed and housed in a metal casing provided with an inlet, an outlet for clean gas, and an outlet for dust via a sealing material.

A preferred embodiment of the filter device of the present invention is a filter device in which the filter body is pressed against a cushion material and / or a spring material and housed in a metal casing.

Yet another preferred embodiment of the filter device of the present invention is a filter device in which regeneration is performed by a backwashing operation in which compressed gas, in particular compressed air, is blown into the clean gas outlet passage side.

As another preferable aspect of the filter device of the present invention, the inside of the plurality of holes of the filter body is a passage for dust-containing gas, and the another passage provided between the filter elements is a passage for cleaning gas. It is a filter device.

Yet another preferred embodiment of the filter device of the present invention is a filter device in which the dust-containing gas to be treated is exhaust gas of a diesel engine.

In the plate-shaped filter element of the present invention, a single filter element can be used to form a filter body, but generally, a plurality of the filter elements are arranged in parallel at a predetermined interval, and ribs and / or spacers are arranged in the respective intervals. Will be stacked,
A filter body having a desired filter area can be easily constructed.

That is, in the filter device of the present invention, a plurality of holes provided so as to penetrate the plate-shaped filter element made of a gas permeable porous material are used as dust-containing gas passages, and a gap provided between the laminated filter elements. As a clean gas passage, when the dust-containing gas is fed into the plurality of holes, the fine particles in the dust-containing gas are trapped on the inner wall surfaces of the plurality of holes of the plate-like body and the gas component passes through the porous wall, It becomes a clean gas and flows out to the clean gas passage formed between the plate-shaped bodies.

The fine particles deposited on the inner wall surfaces of the plurality of holes are backwashed by introducing a backwash airflow into the clean gas passage side formed between the plate-like bodies to form inner wall surfaces of the plurality of holes. Peel from above and regenerate the filter body.

The gas pressure at the time of backwashing is applied from the side wall surface side of the plate-shaped body where the clean gas passage is provided toward the inside of the plurality of holes.

At this time, in the filter element of the present invention, since the inner wall surfaces of the plurality of holes are mountain-shaped toward the side wall surfaces adjacent to each other, a flat plate-shaped porous wall which is not mountain-shaped in the prior art. Since a large bending stress does not occur in the porous wall like the above, it can withstand the gas pressure during the backwash operation sufficiently,
The porous wall, which is the filter wall, is hardly broken.

The side wall surfaces of the filter element of the present invention are generally flat, and are a pair of wider planes of the outer surface of the plate-shaped body, and are substantially parallel to each other. The plurality of holes are located between the pair of planes and form a plurality of long holes penetrating the plate-shaped body from one end face to the other end face.

The size of the holes of the plate-shaped filter element of the present invention can be various sizes depending on the intended use,
Since there is a demand for compactness for repairing fine particles of diesel engine exhaust gas, it is preferable to reduce the inner diameter of the hole to increase the filter area per volume. However, if it is too small, there is a risk of blockage due to fine particles, so it is preferable that the inner diameter is usually about 3 to 10 mm and the thickness of the filter element is about 6 to 30 mm.

For example, when a relatively large plate-shaped filter element can be used for applications such as dust removal of dust-containing gas from a fixed source, for example, the filter element has an inner diameter of 1 to 10 cm and a thickness of 1, It can be about 5 to 15 cm, but if the weight of one plate-shaped fill element is too large, it will be difficult to handle it manually, so the weight of one filter element is preferably 15 kg.

Further, since the plate-shaped filter element of the present invention has a simple structure, it can be easily manufactured by, for example, extrusion molding or casting molding, and the number of defective products during manufacturing can be reduced. Furthermore, a filter body having an arbitrary filter area can be provided by integrally holding or joining the filter elements, which are laminated in parallel, through ribs or spacers.

In the filter body of the present invention, the width of the another passage, which is usually a clean gas passage, formed between the filter elements laminated in parallel to each other is preferable because the filter area per volume of the filter body is increased. The narrower the better, the more preferable is 1/2 or less of the inner diameter of the hole penetrating the filter element. However, if the surface area of the side wall surface is not good, it cannot be narrowed, and if it is too narrow, there is a risk that the backwash gas feed resistance during the backwash operation will increase and the backwash may not work. And

Specific examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a plate-shaped filter element according to the present invention. The plate-shaped filter element 51 is composed of a plate-shaped body 52 made of a breathable porous material.

Examples of the material for the plate-shaped body include ceramics, sintered metal, and polar glass. Among them, cordierite excellent in corrosion resistance, heat resistance and thermal shock resistance, β-spodumene, aluminum titanate, Ceramics such as zircon, muramate, silicon carbide, and silicon nitride are particularly preferable because they can be used for treating various dust-containing gases.

A plurality of holes 55 are formed penetrating the plate-shaped body 52 from one end surface 53 of the pair of opposed end surfaces to the other end surface 54.

In this example, as a preferred example, a plurality of holes 55 are opened in a row on both of the pair of end faces, but a plurality of holes 55 are formed in the plate-like body 52 unless the object of the present invention is affected. It may be formed so as to be arranged in rows or three rows.

FIG. 4 is a cross-sectional view of the filter element taken along a plane perpendicular to the center line of the plurality of holes extending in parallel. When the filter element is divided by the intermediate line 1 of the thickness of the plate member 52, the plurality of holes 55 are formed. The inner wall surface 56 of each of them has a mountain shape toward the side wall surface 57 adjacent thereto. Explaining this in more detail, in the distance between the inner wall surface 56 and the side wall surface 57 of the plurality of holes, if the distance at the center is a and the distances at both ends are b and c, then b> a, c>
That is, the cross-sectional shape of the hole is a.

In this example, holes having a circular cross section (round holes) are adopted as the plurality of holes 55, but if b> a and c> a are satisfied, the cross section as shown in FIG. -Shaped holes (elliptical holes), holes with a square cross section as shown in FIG.
It is also possible to employ a hole having a hexagonal cross section as shown in the drawings and FIG. However, when a part of the inner wall surface 56 of the hole is parallel to the side wall surface 57 as shown in FIG. 8, it is important that the length d of this part is not excessively increased.

Returning to FIG. 1 again, ribs 58 projecting to the side wall surface 57 side adjacent to each other extend along the edges of the end surfaces 53, 54 in which the plurality of holes 55 of the plate-shaped body 52 are opened. The rib 58 is not essential to the present invention, but facilitates assembly when laminating plate-shaped filter elements to form a filter body as described later.

In this example, each rib 58 is formed so as to project on the same side wall surface of the plate-shaped body 52, but the projecting direction of one rib 58 and the projecting direction of the other rib 58 are mutually opposite. It may be on the opposite side of the plate-like body 52, or may be formed in a T-shape or an I-shape so as to project on both sides of the plate-like body 52.

Further, in this example, the ribs 58 are formed only on the edges of the pair of opposed end faces of the plate-shaped body 52, but an arbitrary number of ribs extending in parallel with the ribs 58, 58 are provided in the middle of the ribs 58, 58. Good. In this case, the rib closes one outlet of the another passage formed between the plate-shaped bodies. Further, the plate-shaped body 52
Ribs that are orthogonal to the ribs 58 may be provided along the edges of any one of the remaining pair of end faces different from the pair of end faces.

2 and 3 show a filter body 61 constructed by using the filter element 51. The filter body 61 has a plurality of filter elements 51 stacked in parallel, and forms a separate passage between the filter elements, which is defined by a porous wall of the plate-like body and the plurality of holes. .

The filter element 51 is laminated so that the end faces where the holes 55 are open are aligned and the ribs 58 are oriented in the same direction.

The protruding tip surface of the rib 58 and the side wall surface 57 of the adjacent filter element 51 are integrally joined to each other using a heat-resistant adhesive or the like, or a cushioning material or a gasket is sandwiched between the ribs 58 and the side surface 57 is pressed. At least dust tight is joined by means such as tightening, or by means such as integral sintering.

Thus, in the gap between the filter elements 51, the clean gas passage 62 defined by the rib 58 and the side wall surface 57 is formed so as to open on the side different from the opening surface of the holes 55.

The filter body 61 can be used, for example, as the filter body 33 of the filter device as shown in FIG.
That is, when a dust-containing gas such as diesel engine exhaust gas is fed from one of the openings of the plurality of holes 55, fine particles are trapped on the inner wall surface of the plurality of holes, and the cleaned gas is a porous porous material. It passes through the wall of the plate-like body 52 and is taken out from the clean gas flow path 62.

Most of the fine particles contained in the dust-containing gas 62 are captured by the inner wall surfaces of the plurality of holes 55, a part of the fine particles are directly attached to the inner wall surface, and the remaining part is, for example, from the other opening of the plurality of holes 55. The particles fall into the particle receiving portion 41 in FIG. 10 or flow out and are collected.

When fine particles adhere to and deposit on the inner wall surfaces of the plurality of holes 55, the gas passage pressure loss increases. Therefore, for example, as shown in FIG. 10, the ejector nozzle 40 provided on the clean gas outlet side pressurizes at a suitable interval. Backflush is performed by ejecting gas. The pressurized gas ejected from the nozzle during this backwashing entrains the surrounding gas and becomes a pulse flow, which is blown into the clean gas passage 62.
As a result, the inside of the clean gas passage 62 momentarily becomes a considerably high pressure, and as shown in FIG.
The high pressure P is repeatedly applied to the outer wall surface 57 of the. This pressure P
Acts to crush the porous wall between the plurality of holes 55 and the side wall surface 57. However, in the plate-shaped filter element of the present invention, since the inner wall surfaces 56 of the plurality of holes 55 are formed in a mountain shape toward the adjacent side wall surface 57,
In terms of structural mechanics, the bending stress is less likely to occur with respect to the pressure P as described above, and it is possible to prevent damage to the porous wall that is the filter wall.

In addition, in the filter body 61 shown in FIG.
Instead of 58, it can be used by sandwiching a spacer or the like separate from the filter element 51. In that case, it is not necessary to provide the rib 58, and the filter element 51 can be efficiently manufactured by an extrusion molding method. You can

Further, when the rib 58 is formed so as to project to the side wall surface side adjacent to the edge on one side of the end surface parallel to the center line direction of the plurality of holes 55 penetrating the plate-like body, when the filter element 51 is laminated. The clean gas passage 62 may be opened at the same end face as the plurality of holes 55, but in that case, a sealing means for partitioning the clean gas passage and the dust-containing gas passage at the end face is required. is there.

The plate-shaped filter element of the present invention preferably has a plurality of holes 55 as dust-containing gas passages and a passage side between the side wall surfaces 57 as a clean gas passage, but there is a problem of damage due to pressure during backwashing. If not, use multiple holes 55 as clean gas passages and
The 57 side can also be used as a dust-containing gas passage.

A preferred example of the filter device of the present invention has the structure shown in FIG. 10, which is different from the proposal shown in Japanese Patent Application No. 62-232360 in the structure of the filter body.

[Examples of the Invention] As an example of the present invention, a filter body having the structure shown in Fig. 2 was prototyped and incorporated into a filter device having the configuration shown in Fig. 10 as a prototype. For comparison, a filter device having the structure shown in FIG. 10 was manufactured by incorporating a filter body having the structure shown in FIG. The specifications, test conditions, and test results of the tested filter element and filter body are shown below.

Filter element of the present invention (example) Material: Cordierite molding method: Casting porosity: about 34% Average pore diameter: about 22 μm length × width × thickness: 240 × 224 × 15 mm circular pore diameter; 7 mm circular pore Pitch: 10 mm Rib height: 2,8 mm Filter body of the present invention (example) A stack of 20 filter elements is set as one block, and the other passages formed between the filter elements are connected to each other. The three blocks were superposed on each other and used as a filter body for the test.

However, the inside of the circular hole of the filter element was used as a dust-containing gas passage, and the other passage side between the filter elements was used as a clean gas passage.

Clean gas passage width: Approx. 3,0 mm Effective filter area: Approx. 7,2 m ² Comparative filter material: Cordierite molding method: Single cast molding Porosity: Approx. 34% Average pore diameter: Approx. 23 μm length x width x Height: 700 x 610 x 350 mm Exhaust gas flow width: 5 mm Clean gas flow width: 5 mm Effective filter area: 7.1 m ² Test conditions Engine used: Displacement 6.7 l, direct injection diesel engine, rated output, 180 ps / 3000rpm Exhaust gas; Operates at 2900rpm × 130ps Exhaust gas temperature 550 ℃ Exhaust gas flow rate 430Nm ² / hr Backwash condition Air source pressure; 6.0kg / cm ² Backwash time; 0.1sec Backwash interval; 300sec Ejector nozzle; Diameter 25mm X 2 used Backwash air injection amount; 85N / time Test result Average filter pressure loss during use Example: Approximately 1200mmAq Comparative example; Approximately 1200mmAq However, a decrease was observed after approximately 20 hours.

Fine particle concentration in clean gas Example: Approximately 3 mg / Nm ³ No change after 50 hours.

Comparative example; about 3 mg / Nm ³ However, the increase started after about 20 hours and became about 120 mg / Nm ³ after 30 hours. This is because the filter body was damaged (cracked).

Other results, in the plate-shaped filter element of the present invention, there is a difference in ventilation resistance because the wall thickness between the inner wall surface of the plurality of holes and the side wall surface of the plate-shaped body is different depending on the site. It was feared that the inner wall surface of the holes would not be used uniformly as the filter surface, but the pressure loss during the dust collection operation may depend largely on the fine particle layer trapped on the filter surface, which is not practical. It was confirmed that it could be used without problems.

"Effects of the Invention" As described above, if a plate-shaped filter element formed by penetrating a plurality of holes in the plate-shaped body made of the air-permeable porous material of the present invention is used, an appropriate width is provided between them. Since the filter body can be assembled by simply stacking the gaps in parallel with each other, a filter body having an arbitrary filter area can be constructed, and at the same time, the manufacture thereof can be facilitated and the number of defective products can be reduced.

Further, as shown by the results of comparison with the embodiment of the invention, even if the clean gas passage becomes high pressure due to the backwash air flow and a high pressure acts on the wall surface, the plurality of the filter elements constituting the dust-containing gas passage are formed. Since the inner wall shape of each of the holes has a mountain shape toward the side wall surface, it is possible to prevent breakage of the porous wall that is the filter wall, that is, breakage of the filter element, and stack the filter elements. When the filter device using the filter body configured as described above is used as a diesel engine exhaust gas filter device that is regenerated by backwashing operation, it can be used stably for a long period of time.

The plate-shaped filter element, the filter body and the filter device according to the present invention are suitable for removing fine particles of diesel engine exhaust gas, but dust removal treatment of other dust-containing gas, for example, blast furnace of steel mill, converter, coke It can be used for removing dust-containing gas generated in furnaces, coal gasification equipment, nuclear waste treatment equipment, fluid catalytic cracking equipment, fluidized bed boilers, etc.

Further, by utilizing the compact filter device having a large filter area per volume according to the present invention, it is possible to remove dust-containing gas with almost no cooling, and it has been conventionally performed due to the presence of dust. The heat recovery from high-temperature dust-containing gas, which was not possible, opens the way for many cases including small-capacity equipment, and in terms of energy saving, it is also possible to recover dust in a dry state. In terms of effective utilization of the dust, the industrial utility value is great.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a plate-shaped filter element according to the present invention, FIG. 2 is a perspective view showing a filter body constructed by using the filter element, and FIG. 3 is a partial cross section of the filter body. FIG. 4 is a partial cross-sectional view showing a pressure state applied to the filter element during backwashing operation, FIG. 5, FIG. 6, FIG. 7 and FIG. 8 are views of a plate-shaped filter element according to the present invention. FIG. 9 is a perspective view showing a conventional filter body, and FIG. 10 is an example of a filter device using a filter body of the kind shown in FIGS. 2 and 9 respectively. FIG. In the figure, 51 is a filter element, 52 is a plate-like body, 53 and 54 are end faces, 55 is a plurality of holes, 56 is an inner wall surface of the hole, 57 is a side wall surface, 58
Is a rib, 61 is a filter body, and 62 is a clean gas passage.

Claims (17)

[Claims] 1. A plurality of holes are formed by penetrating the plate-shaped member from one end face of the pair of opposed end faces of the plate-shaped member made of a gas permeable porous material to the other end face of the plate-shaped member. The plate-shaped filter element is characterized in that the inner wall surface of each of the holes has a mountain shape toward the side wall surface of the plate-shaped body which is close to the hole. 2. The plate-shaped filter element according to claim 1, wherein the side wall surface of the plate-shaped body is a quadrangle. 3. The one according to claim 1 or 2, wherein the cross-sectional shape of the plurality of holes, which is cut by a plane perpendicular to the center line of the plurality of holes, is selected from a circle, an ellipse, or a polygon having a rectangular shape or more. A plate-shaped filter element. 4. The plate-shaped filter element according to claim 1, wherein the center lines of the plurality of holes are substantially straight lines and are substantially parallel to each other. 5. The plate-shaped filter element according to claim 1, wherein the plurality of holes are opened substantially in line on both sides of the facing end faces. 6. The rib according to any one of claims 1 to 5, wherein a rib is formed to extend along the edge of each of the facing end faces of the plate-like body so as to project toward a side wall face adjacent to the end face. Plate-shaped filter element. 7. A plate-shaped filter element according to any one of claims 1 to 6, wherein the plate-shaped body is made of air-permeable porous material made of ceramics. 8. The plate-shaped filter element according to any one of claims 1 to 6, wherein the material forming the plate-shaped body is a breathable porous material which is either sintered metal or polar glass. . 9. A plurality of holes are formed from one end face of a pair of opposed end faces of a plate-like body made of a gas permeable porous material to the other end face through the plate-like body. A plurality of plate-shaped filter elements each having a mountain shape toward the side wall surface of the plate-shaped body in which the inner wall surfaces of the holes are close to each other are laminated in parallel so that the end surfaces are aligned, and between the filter elements. The plurality of holes is a filter body that constitutes another passage defined by the porous wall of the plate-like body. 10. The structure according to claim 9, wherein the another passage has a pair of adjacent end faces different from the pair of end faces facing each other in which a plurality of holes of the plate-like body are open. Filter body. 11. The plate-shaped filter element according to claim 10, wherein a rib is formed so as to project and extend toward a side wall surface side adjacent to the end surfaces along the edges of the pair of opposed end surfaces of the plate-shaped body. A plurality of layers are laminated in parallel, and the plurality of holes are formed between the filter elements by the ribs to form another passage having a width substantially equal to the protruding width of the ribs defined by the porous wall of the plate-shaped body. A filter body characterized by being. 12. The spacer according to claim 10, wherein the filter elements are laminated with a spacer interposed therebetween, and the spacer separates the plurality of holes from the porous wall of the plate-like body. A filter body, characterized in that it constitutes another passage of a width approximately equal to the thickness. 13. A plurality of holes are formed from one end face of a pair of opposed end faces of a plate-like body made of a gas permeable porous material to the other end face through the plate-like body to form a plurality of holes. A plurality of plate-shaped filter elements each having a mountain shape toward the side wall surface of the plate-shaped body in which the inner wall surfaces of the holes are close to each other are stacked in parallel so that the end surfaces are aligned, and the plurality of filter elements are interposed between the filter elements. The hole constitutes another passage defined by the porous wall of the plate-shaped body, and the different passage is adjacent to the pair of opposite end faces where the plurality of holes of the plate-shaped body are open. A pair of end faces is a filter body configured to open on both sides, and the filter body is provided with a metal casing provided with an inlet for dust-containing gas, an outlet for clean gas, and an outlet for dust through a sealing material. Fill that is fixed and stored Apparatus. 14. The filter device according to claim 13, wherein the filter body is housed in a metal casing so as to be pressed by a cushion material and / or a spring material. 15. A filter device according to claim 13 or 14, wherein the compressed gas is blown into the clean gas outlet passage side to perform regeneration by a backwash operation. 16. The filter device according to claim 15, wherein the inside of the plurality of holes of the filter body is a passage for the dust-containing gas, and the another passage provided between the filter elements is a clean gas passage. 17. The method according to any one of claims 13 to 16,
A filter device in which the dust-containing gas to be processed is the exhaust gas of a diesel engine.