JPH04284806A - Exhaust gas treatment device - Google Patents

Abstract

PURPOSE:To increase the number of parallelly arranged filters without increasing the size of a casing to enhance treatment performance in an exhaust gas treatment device by supporting the filters slidably in the axial direction of a partition member in a casing. CONSTITUTION:A connection member 23 is supported by a supporting member 22 fixed to a partition member 14 in a gas-tight and axially slidable manner with respect to said member 22 and said connection member 23 has a plurality of branch pipes 23b2 which are connected to filters 21. Each of the filters 21 is connected to each of the branch pipes 23b2 so that a plurality of filters 21 are supported by one supporting member 22 and one connection member 23.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treatment apparatus for treating high-temperature exhaust gas, collecting dust contained in the gas, and discharging the gas as a clear treated gas.

0002

[Prior Art] As a type of exhaust gas treatment device, as proposed in Japanese Patent Application No. 1-323509, which is an earlier application by the present applicant, a casing having a gas inlet hole and a gas outlet hole is provided. The casing has a partition member that partitions the inside of the casing into an upstream chamber where the gas inflow hole opens and a downstream chamber where the gas outflow hole opens, and a large number of cylindrical filters arranged in parallel with each other in the casing. The filter is supported by the partition member by being connected to a cylindrical connecting member that is supported in an airtight manner and allowed to move in the axial direction via a support member assembled to the partition member, and the filter is supported by the partition member. There is an exhaust gas treatment device in which the gas to be treated that flows into the upstream chamber from the gas inflow hole flows out into the downstream chamber through the filters, and is discharged as treated gas from the gas outflow hole.

[0003] The exhaust gas treatment device of the type related to the earlier application mainly treats high-temperature gas to be treated, and a filter made of ceramic is used, and a filter made of ceramic and a casing made of metal are combined. In order to absorb the difference in thermal expansion, a cylindrical connecting member is adopted as a support means for the partition wall member of each filter, and the connecting member is connected to the lower end of the filter and is airtightly and axially connected to the partition wall member side. Each filter is slidably assembled and supported by the partition member.

FIG. 6 shows a support structure for supporting a filter on a partition member in this type of exhaust gas treatment device. In this support structure, a connecting member 1 has a cylindrical shape; The member 1 is joined and connected to the outward flange 2a provided at the tip of the filter 2 at the outward flange 1b provided at the end of the cylindrical portion 1a, and is supported on the partition wall member 3 side via the support member 4. ing. The support member 4 is formed by fitting a cylindrical sealing material 4a made of an elastic inorganic material into a cylinder 4b. The outward flange portion 4c is fixed to the peripheral edge of the through hole 3a of the partition member 3. Thereby, the filter 2 is supported airtightly and slidably in the axial direction with respect to the partition wall member 3 via the support member 4.

[0005]

[Problems to be Solved by the Invention] In order to improve the exhaust gas processing capacity of this type of exhaust gas treatment device, it is necessary to increase the length of each filter or increase the number of filters in parallel by increasing the diameter of the casing. is possible. However, if the overall size of the exhaust gas treatment device is specified, there are limits to the adoption of these methods, and it is extremely advantageous to increase the processing capacity without increasing the size of the device. Therefore, it is disadvantageous to adopt these methods. The present inventors have discovered that in this type of exhaust gas treatment device, the outward flange portion 4c of the support member 4 that supports the connecting member 1 has a considerably larger diameter than the filter 2, and that the dimensions of the flange portion 4c are the same as those of the filter 2. Focusing on the fact that it cannot be made smaller than a predetermined value in relation to the size of the support member 4, in the present invention, the support member 4
The purpose is to increase the number of parallel filters 2 without changing the size of the filter.

[0006]

[Means for Solving the Problems] The present invention provides an exhaust gas treatment device of the type described above, in which the connecting member is composed of a cylindrical main body portion and a plurality of cylindrical branch portions branching from one end of the cylindrical main body portion. and the cylindrical main portion of the connecting member is airtightly and slidably supported in the axial direction by the supporting member, and each cylindrical branch portion of the connecting member is connected to the -end side of each of the filters. It is characterized by:

[0007]

In the exhaust gas treatment device having such a structure, the connecting member is connected to the number of filters corresponding to the cylindrical branch portions and is supported on the partition wall member side by one support member. One outward flange part of the support member supports a plurality of filters corresponding to the cylindrical branch part, and the above-mentioned restriction on the number of filters in parallel due to the outward flange part is greatly relaxed, and the same filters can be arranged in parallel. It is possible to increase the number.

[0008]

[Effects of the Invention] Therefore, according to the exhaust gas treatment device of the present invention, the number of parallel filters can be increased without increasing the size of the casing, and the exhaust gas treatment ability can be improved without increasing the size of the device. This is possible and extremely advantageous both industrially and economically.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an exhaust gas treatment apparatus according to the present invention. The exhaust gas treatment device has a large number of filters 21 arranged in parallel in a casing 10 which is the main body of the device, and the casing 10 includes a cylindrical main body 11 and
1, a lower cone portion 12 covering the lower end of the main body 11;
It is constituted by an upper cover part 13 that covers the upper end part. These three members 11, 12, and 13 are hermetically joined to each other with an upper support plate 14 and a lower support plate 15 sandwiched therebetween. Such a casing 10
In this case, a gas inflow hole 11a is formed in the upper side of the main body 11, and a gas outflow hole 13a is formed in the center of the upper part of the upper cover part 13.

The upper support plate 14 corresponds to the partition member of the present invention, and divides the inside of the casing 10 into an upstream chamber 16a in which the gas inflow hole 11a opens and a downstream chamber 16b in which the gas outflow hole 13a opens. Gas inflow hole 11a
A supply pipe 31 for supplying exhaust gas is connected to the exhaust gas, and a discharge pipe 32 for treated gas is connected to the gas outlet hole 13a. The support plates 14 and 15 are connected to each other and supported by a column 17 that stands up in the center of the cylindrical body 11, and each filter 21 is supported by each support plate 14 and 15. The filter 21 is an elongated one made of a plurality of ceramic cylindrical filter elements 21a connected airtight in the axial direction, and as shown in FIGS. It is supported by the upper support plate 14 and received and fixed by the lower support plate 15. Each filter 21
are arranged in parallel with each other in such a supported state.

As shown in FIG. 2, the support member 22 includes a cylinder 22b having a disk-shaped outward flange 22a in the middle, and a cylindrical sealing material fitted to the inner periphery of the cylinder 22b. 22c. The sealing material 22c is made of an elastic inorganic material molded to a predetermined hardness, and is prevented from coming off by a regulating plate 22d fixed to the inward flange portion of the cylindrical body 22b and the upper end of the cylindrical body 22b. - On the other hand, the connecting member 23 consists of a sliding pipe 23a and a collecting pipe 23b,
The lower end of the sliding pipe 23a and the upper end of the collecting pipe 23b are airtightly joined to each other. The collecting pipe 23b has a large diameter pipe part 23b1 and three branch pipe parts 2 of the same pipe part and the body.
It is composed of 3b2. In the connecting member 23, the sliding pipe 23a and the collecting pipe 23b correspond to the cylindrical main body part and the cylindrical branch part of the present invention.

The connecting member 23 is connected to the filter 21 and supports the filter 21 on the upper support plate 14 via the supporting member 22, and the lower end of the branch pipe portion 23b2 of the collecting pipe 23b constitutes the filter 21. The sliding tube 23a is hermetically joined to the first joining flange portion 21b assembled to the upper end of the filter element 21a, and the sliding tube 23a is fitted into the sealing material 22c that constitutes the support member 22 so as to be connected to the support member 22. It is supported airtightly and slidably in the axial direction. In the support member 22, an outward flange portion 22a of the cylindrical body 22b is fixed to an upper outer peripheral edge of a through hole 14a provided in the upper support plate 14. As a result, in this embodiment, three filters 21 are supported in parallel with each other by one support member 22 and one connection member 23.

In each of these filters 21, as shown in FIGS. 3 and 4, a third joining flange portion 21d is provided at a second joining flange portion 21c that joins the filter elements 21a constituting the filter 21 to each other. A support plate 21e is fixed to the third joint flange portions 21d facing each other, and the support plate 21
At e, the three filters 21 are mutually restricted from being in a free state. Further, the reference numeral 33 shown in FIG. 1 is a compressed air supply pipe constituting the backwashing device, and each compressed air supply pipe 33 is provided with a lead-out pipe facing the upper end opening of each filter 21 to lead out the compressed air at predetermined time intervals. to backwash each filter 21.

[0014] In the exhaust gas treatment device having such a configuration,
During operation, high-temperature exhaust gas flows into the upstream chamber 16a of the casing 10 from the supply pipe 31 as a gas to be treated, and the flowing exhaust gas permeates from the outer circumferential side to the inner circumferential side of each filter 21 and flows out into the downstream chamber 16b. It is discharged from the downstream chamber 16b to the outside via the discharge pipe 32. When the gas to be treated passes through the filter 21, mixed dust is captured on the outer circumferential surface of the filter 21, and the treated gas becomes clear and flows out into the downstream chamber 16b.

During operation, the exhaust gas treatment device gradually becomes hot and expands in the axial direction, and after the operation is finished, it gradually cools down and contracts in the axial direction. For this reason, relative expansion and contraction occur between the casing 11 and the filter 21, but since the connecting member 23 slides in the axial direction with respect to the support member 22, these relative expansions and contractions are allowed. No trouble occurs to the filter 21 at all.

By the way, in the exhaust gas treatment device, each filter 21 is supported via a connecting member 23 to a support member 22 assembled to the upper support plate 14, and the connecting member 23 is a branch pipe section. 23b2
The structure is such that three filters 21 are supported by one connecting member 23 and one supporting member 22. Therefore, as is clear from FIG. 5 which schematically shows the arrangement state of the filters 21, each filter 2
1 are arranged in a superimposed state on the outward flange portion 22a of the support member 22, and the number of filters arranged is extremely large compared to the case where one filter is arranged for one flange portion 22a. Become. Note that each vertex of the triangular mark indicated by a dashed-dotted line in the figure indicates the center of each filter 21. Therefore, according to the exhaust gas treatment device, the casing 1
It is possible to increase the number of parallel filters 21 without increasing the number of filters 21, and it is possible to improve the exhaust gas processing capacity without increasing the size of the device, which is extremely advantageous from an industrial and economical point of view. In addition, in the exhaust gas treatment device, the three filters 21 are connected to each other to form one unit, so the filter unit has a larger natural frequency than the filter 21 and has improved earthquake resistance.

[0017] In this exhaust gas treatment device, it is possible to connect the three filters 21 with the minimum spacing, but it is necessary to take into consideration the ease with which dust attached to the outer peripheral surface of each filter 21 can be removed. In this case, it is preferable to connect them while maintaining a predetermined distance from each other as shown in FIG. In addition, in order to evenly supply backwashing pressure air to each filter 21 constituting the filter unit during backwashing of each filter 21, the inside of the sliding pipe section 23a of the connecting member 23 should correspond to each branch pipe section 23b2. and a compressed air supply pipe 3
It is preferable that the tip of No. 3 is branched corresponding to each partition. When assembling the filter unit into the casing 10, it is preferable to connect the filter 21 in advance to form a filter unit and assemble it as the filter unit.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of an exhaust gas treatment device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged vertical cross-sectional view showing a support structure for a filter in the exhaust gas treatment device.

FIG. 3 is a partially enlarged cross-sectional view showing a support structure between filters in the exhaust gas treatment device.

FIG. 4 is a partially enlarged vertical cross-sectional view showing a joint structure between filter elements in the same exhaust gas treatment device.

FIG. 5 is a plan view schematically showing the arrangement of filters in the exhaust gas treatment device.

FIG. 6 is a longitudinal sectional view showing a filter support structure of an exhaust gas treatment device according to a comparative example with respect to the filter support structure of the same exhaust gas treatment device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10... Casing, 11a... Gas inflow hole, 13a... Gas outflow hole, 14, 15... Support plate, 21... Filter, 22... Support member, 22a... Outward flange part, 23...
Connection member, 23a...Sliding pipe part, 23b...Collecting pipe part, 23
b1...large diameter pipe section, 23b2...branch pipe section, 31...supply pipe, 32...discharge pipe.

Claims (1)

[Claims] 1. A casing having a gas inflow hole and a gas outflow hole includes a partition member that partitions the inside of the casing into an upstream chamber in which the gas inflow hole opens and a downstream chamber in which the gas outflow hole opens. A cylinder having a large number of cylindrical filters arranged in parallel with each other in a casing, the filters being supported airtightly and allowing movement in the axial direction via a support member assembled to the partition wall member. is connected to a connecting member having a shape and is supported by the partition wall member, and causes the gas to be treated flowing into the upstream chamber from the gas inflow hole to flow out into the downstream chamber through the respective filters, so that the gas flows out as treated gas. The exhaust gas treatment device discharges from a hole, wherein the connecting member includes a cylindrical main body portion and a plurality of cylindrical branch portions branching from one end of the cylindrical main body portion, the cylindrical main body portion of the connecting member is airtightly and slidably supported in the axial direction by the support member, and each cylindrical branch portion of the connection member is connected to the -end side of each of the filters.