JPH0736883B2 - Exhaust gas treatment device - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a type of an exhaust gas treating apparatus, as proposed in Japanese Patent Application No. 1-323509 filed by the applicant of the present application, the same type is used in a casing having gas inflow holes and gas outflow holes. It has a partition member that divides the inside of the casing into an upstream side chamber in which the gas inflow hole opens and a downstream side chamber in which the gas outflow hole opens, and also has a large number of tubular filters arranged in parallel in the same casing. Then, the filter is connected to a tubular connecting member that is supported airtightly and allows movement in the axial direction via a supporting member assembled to the partition member, and is supported by the partition member, There is an exhaust gas treatment device in which a gas to be treated flowing into the upstream chamber from a gas inlet is caused to flow out to the downstream chamber through each of the filters and discharged as a treated gas from the gas outlet.

The exhaust gas treating apparatus of the type according to the prior application mainly treats a high-temperature gas to be treated, a ceramic filter is adopted as the filter, and the ceramic filter and the metal casing are used. In order to absorb the difference in thermal expansion, a tubular connecting member is adopted as a supporting means for the partition member of each filter, the connecting member is connected to the end of the filter, and the partition member side is airtight and axially. The filters are slidably assembled to support each filter on the partition member.

FIG. 6 shows a supporting structure for supporting the filter on the partition member in the exhaust gas treating apparatus of this type. In the supporting structure, the connecting member 1 has a cylindrical shape, and the connecting member 1 has the same shape. The member 1 is joined and connected to the outward flange portion 2a provided at the tip of the filter 2 by the outward flange portion 1b provided at the end of the tubular portion 1a, and is supported by the partition member 3 side via the support member 4. ing. The supporting member 4 is formed by fitting a cylindrical sealing material 4a made of an inorganic material having elasticity into the cylindrical body 4b. The supporting member 4 is fitted to the outer periphery of the connecting member 1. The outward flange portion 4c is fixed to the peripheral portion of the through hole 3a of the partition member 3. As a result, the filter 2 is supported by the support member 4 so as to be airtight and slidable in the axial direction with respect to the partition member 3 side.

[0005]

By the way, in order to improve the exhaust gas treating ability in the exhaust gas treating apparatus of this type, it is necessary to increase the length of each filter or increase the diameter of the casing to increase the number of filters in parallel. Can be considered. However, when the overall size of the exhaust gas treatment device is specified, there is a limit to the adoption of these means, and it is extremely advantageous to increase the treatment capacity without increasing the size of the device. Therefore, it is disadvantageous to adopt these means. In the exhaust gas treating apparatus of this type, the present inventors have found that the outward flange portion 4c of the support member 4 that supports the connection member 1 has a considerably larger diameter than the filter 2, and the size of the flange portion 4c is the filter 2 In view of 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 purpose is to increase the number of parallel filters 2 without changing the size of the filter.

[0006]

According to the present invention, in the exhaust gas treating apparatus of the above-mentioned type, the connecting member is composed of a tubular main body and a plurality of tubular branching portions branched from the end of the tubular main body. Then, the tubular main body portion of the connecting member is supported by the supporting member in an airtight manner and slidable in the axial direction, and each tubular branch portion of the connecting member is connected to the minus end side of each of the filters. It is characterized by.

[0007]

In the exhaust gas treating apparatus having such a structure, the connecting member is connected to the number of filters corresponding to the tubular branch portion and is supported on the partition member side by one supporting member. One outward flange portion of the support member supports a plurality of filters corresponding to the tubular branch portion, so that the limitation on the number of filters in parallel due to the outward flange portion is significantly relaxed and the filters are arranged in parallel. It is possible to increase the number.

[0008]

Therefore, according to the exhaust gas treatment apparatus of the present invention, the number of filters in parallel can be increased without enlarging the casing, and the exhaust gas treatment capacity can be improved without increasing the size of the apparatus. Is possible and is extremely advantageous industrially and economically.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an exhaust gas treating apparatus according to the present invention. The exhaust gas treating apparatus is configured by arranging a large number of filters 21 in parallel inside a casing 10 which is a main body of the apparatus.
Lower cone portion 12 for covering the lower end portion of 1 and the main body 11
The upper cover portion 13 covers the upper end portion of the. These three members 11, 12 and 13 are hermetically joined to each other with the upper support plate 14 and the lower support plate 15 being sandwiched therebetween. Such casing 10
In the above, the gas inflow hole 11a is formed above the side portion of the main body 11, and the gas outflow hole 13a is formed in the upper center of the upper cover portion 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 is opened and a downstream chamber 16b in which the gas outflow hole 13a is opened. Gas inflow hole 11a
Is connected to a supply pipe 31 for supplying exhaust gas, and a discharge pipe 32 for the treated gas is connected to the gas outflow hole 13a. The support plates 14 and 15 are connected to and supported by a column 17 standing upright in the center of the tubular body 11, and the support plates 14 and 15 support the filters 21. The filter 21 is a long one formed by air-tightly connecting a plurality of ceramic cylindrical filter elements 21a in the axial direction, and via a supporting member 22 and a connecting member 23 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 supporting state.

As shown in FIG. 2, the support member 22 has a cylindrical body 22b having a disk-shaped outward flange portion 22a in the middle thereof, and a cylindrical sealing material fitted to the inner circumference of the cylindrical body 22b. 22c. The sealing material 22c is made of an elastic inorganic material having a predetermined hardness, and is secured by an inward flange portion of the tubular body 22b and a regulation plate 22d fixed to the upper end of the tubular body 22b. On the other hand, the connecting member 23 comprises 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 includes a large-diameter pipe portion 23b1 and three branch pipe portions 2 of the same pipe portion and the body.
3b2. In the connecting member 23, the sliding pipe 23a and the collecting pipe 23b correspond to the tubular main body portion and the tubular branch portion 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. The lower end of the branch pipe portion 23b2 of the collecting pipe 23b constitutes the filter 21. The first joint flange portion 21b assembled to the upper end portion of the filter element 21a is hermetically joined to the first joint flange portion 21b, and the sliding tube 23a is fitted to the seal material 22c constituting the support member 22 so that the support member 22 is supported. It is supported airtightly and slidably in the axial direction. In the support member 22, the outward flange portion 22a of the tubular body 22b is fixed to the upper outer peripheral edge portion of the through hole 14a provided in the upper support plate 14. As a result, in this embodiment, the three filters 21 are supported in parallel with each other by the single support member 22 and the connection member 23.

In each of these filters 21, as shown in FIGS. 3 and 4, a third joint flange portion 21d is provided on a second joint flange portion 21c for joining the filter elements 21a constituting the filter 21 to each other. The support plate 21e is fixed to the third joint flange portions 21d facing each other.
At e, the three filters 21 are restricted from each other in a free state. Further, reference numeral 33 shown in FIG. 1 denotes a compressed air supply pipe that constitutes a backwashing device, and each compressed air supply pipe 33 has a discharge pipe facing the upper end opening of each filter 21, and discharges compressed air at predetermined time intervals. And each filter 21 is backwashed.

In the exhaust gas treating apparatus having such a structure,
During operation, high temperature exhaust gas flows into the upstream chamber 16a of the casing 10 from the supply pipe 31 as the gas to be treated, and the inflowing exhaust gas permeates from the outer peripheral side to the inner peripheral side of each filter 21 and flows out to 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 processed passes through the filter 21, the mixed dust is trapped on the outer peripheral surface of the filter 21 and becomes a clear processed gas and flows out to the downstream chamber 16b.

During operation, the exhaust gas treatment apparatus gradually becomes hot and expands in the axial direction, and after the operation is completed, it is gradually cooled and contracts in the axial direction. Therefore, relative expansion and contraction occur between the casing 11 and the filter 21, but the connection member 23 slides relative to the support member 22 in the axial direction to allow these relative expansion and contraction. No hindrance to the filter 21 occurs.

By the way, in the exhaust gas treating apparatus, each filter 21 is supported by the supporting member 22 assembled to the upper support plate 14 via the connecting member 23. 23b2
Is adopted, and the three filters 21 are supported by one connecting member 23 and one supporting member 22. Therefore, as is apparent from FIG. 5, which schematically shows the arrangement state of the filters 21, the filters 2 can be seen in a plan view.
1 will be arranged in a state of being overlapped with the outward flange portion 22a of the support member 22, and the number of arranged filters is extremely large as compared with the case where one filter is arranged for one flange portion 22a. Become. In addition, each apex of the triangular mark shown by the one-dot chain line in the figure shows the center of each filter 21. Therefore, according to the exhaust gas treatment apparatus, the number of filters 21 in parallel can be increased without enlarging the casing 10, and the exhaust gas treatment capacity can be improved without increasing the size of the apparatus. It is extremely advantageous economically and economically. Further, in the exhaust gas treating apparatus, the three filters 21 are connected to each other to form one unit, so that the filter unit has a larger natural frequency as compared with the filter 21, and the earthquake resistance is improved.

In the exhaust gas treating apparatus, it is possible to pack and connect the three filters 21 so as to have a minimum interval, but the detachability of dust adhering to the outer peripheral surface of each filter 21 is taken into consideration. Then, as shown in FIG. 3, it is preferable to connect them while maintaining a predetermined gap therebetween. Further, in order to uniformly supply the compressed air for reverse cleaning at the time of reverse cleaning of each filter 21 to each filter 21 constituting the filter unit, the inside of the sliding pipe portion 23a of the connecting member 23 corresponds to each branch pipe portion 23b2. And divide it, and the compressed air supply pipe 3
It is preferable that the tip of 3 be branched corresponding to each partition. When assembling the filter unit in the casing 10, it is preferable that the filter 21 is connected to the filter unit in advance so that the filter unit is assembled.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of an exhaust gas treating apparatus according to an embodiment of the present invention.

FIG. 2 is a partially enlarged vertical sectional view showing a filter support structure in the exhaust gas treating apparatus.

FIG. 3 is a partial enlarged cross-sectional view showing a support structure between filters in the exhaust gas treating apparatus.

FIG. 4 is a partially enlarged vertical sectional view showing a joint structure between respective filter elements in the same exhaust gas treating apparatus.

FIG. 5 is a plan explanatory view schematically showing an array state of filters in the exhaust gas treating apparatus.

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

[Explanation 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 part, 23b2 ... Branch pipe part, 31 ... Supply pipe,
32 ... Discharge pipe.

Claims (1)

[Claims] 1. A casing having a gas inflow hole and a gas outflow hole, and a partition member for partitioning the inside of the casing into an upstream side chamber in which the gas inflow hole opens and a downstream side chamber in which the gas outflow hole opens. A cylinder having a large number of cylindrical filters arranged in parallel in a casing, the filter being supported airtightly and allowing axial movement through a supporting member assembled to the partition member. A gas to be processed which is connected to a strip-shaped connecting member and is supported by the partition wall member and which flows into the upstream side chamber from the gas inflow hole through the filters to the downstream side chamber, and the gas flows out as a treated gas. An exhaust gas treatment device for discharging from a hole, wherein the connecting member is composed of a tubular main body and a plurality of tubular branching portions branched from one end of the tubular main body, and the tubular main body of the connecting member. Exhaust gas treatment apparatus, characterized in that the slidably supported on the support member to hermetically and axially, and to connect each tubular branch portion of the connecting member to the over end of the respective filters.