JPH06285320A - Filter element mounting device - Google Patents

Abstract

PURPOSE:To obtain a filter element mounting device capable of absorbing the elongation difference of a filter element due to a high-temp. gas and capable of preventing the leakage. CONSTITUTION:This device is provided with a tube sheet sleeve 4 attached almost vertically to an upper partition tube sheet 2 and having a flange 17 at the upper end, an element upper sleeve 6 inserted into the upper part in the tube sheet sleeve through a powder seal 12 and having a receiver face (a) on the lower end face, a slide dust seal sheet 9 with the perpiphery fixed to the flange 17 and the inner periphery to the upper end face of the sleeve 6 and a ceramic-tube filter element 5 arranged almost coaxially on the receiver face (a) through a sheet packing 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter element mounting device applied to a dust removing device for high temperature gas in a combustion facility using fossil fuel or the like.

[0002]

2. Description of the Related Art In recent years, a porous ceramic body has been used as a filter element of a dust remover for a high temperature dust-containing gas of about 800 ° C. to 900 ° C., but it is fragile and easily damaged. Due to its nature, there are many problems that require various technical solutions. The ceramic tube elements are usually arranged vertically in the dust remover. Regarding the sealing or joining between the pipe placed in this way and the upper and lower metal partition tube plates, the welding, screw expansion or metal bellows methods that have been used for metal tubes and metal tube plates cannot be simply used. Of course, the high gas temperature,
As a method that has been used as a conventional technique under adverse conditions such as elongation, difference in elongation, or dust, a method of filling a powder layer between the outer peripheral portion of the ceramic tube element and the tube sheet is known. However, when this is used in a dust remover, there is a problem that powder is scattered during backwashing. Similarly, there is also a method in which a string-shaped sealing material made of ceramic fiber is wound between the outer peripheral portion of the ceramic tube and the insertion hole of the water-cooled tube plate to fill and seal. Also in this method, sliding occurs when the plant and the dust removing device start / stop due to the difference in elongation, and wear is reduced, resulting in insufficient sealing. In addition, the problem due to leakage during backwashing is a problem as in the previous example.

Alternatively, Japanese Patent Application Laid-Open No. 58-210488 proposes a seal structure using a soft material such as ceramic cloth and fine particles such as silica sand. It is said that this structure has a possibility that fine particles may drop when the number of sliding times due to the difference in elongation is large, and that the sealing property is not always sufficient.

In addition, in this field, JP-A-63-567 is used.
No. 92, for a water-cooled tube sheet, but mainly for metal bellows, or JP-A-63-306.
92, a method centering on a heat-expandable mat for a non-water-cooled tube sheet has been filed.

[0005]

In the conventional method relating to the above-mentioned conventional sealing structure of the partition metal tube sheet and the ceramic tube, there is a possibility that the seal portion may be damaged, or sliding wear due to elongation or the like may be caused. There is a problem that the sealing property of the sealing member is insufficient due to, the cooling part is required for the tube sheet when processing high temperature gas, or the joining part is difficult to attach and detach. It was

[0006]

The present invention takes the following means in order to solve the above problems. (1) A tube plate sleeve that is provided almost vertically on the upper partition tube plate and has a flange at the upper end, and an element upper sleeve that is inserted into the upper part of the tube plate sleeve through a powder seal and has a saucer surface at the lower end surface. , A sheet-like slide type dust seal sheet having an outer peripheral surface attached to the flange and an inner peripheral surface attached to the upper end surface of the element upper sleeve and having a curved cross section, and a sheet packing on the pan surface of the element upper sleeve via a sheet packing. A filter element mounting device comprising a ceramic tube filter element arranged coaxially. (2) The filter element mounting device of the above (1), wherein the slide type dust seal sheet is an accordion type dust seal sheet. (3) The filter element mounting device of the above (1), wherein the slide type dust seal sheet is a labyrinth sleeve mounted on the tube sheet sleeve side. (4) In the filter element mounting device according to the above (1) to (3), an erosion protector covering the upper end surface of the element upper sleeve and the upper end portion of the tube sheet sleeve,
A filter element mounting device comprising the tube sheet sleeve, the ceramic tube filter element, and a packing provided between any of the element upper sleeves. (5) A ceramic tube filter element in which an element lower sleeve that is provided substantially vertically on the lower partition plate and has a saucer surface on the upper end surface, and a lower end surface that is arranged substantially coaxially on the saucer surface of the element lower sleeve through a sheet packing A filter element mounting device comprising:

[0007]

[Action]

(A) In the inventions (1) and (2), when a high temperature dust-containing gas is introduced, an elongation difference occurs in the axial direction between the ceramic tube filter element and the tube sheet sleeve. This elongation difference is absorbed by the deformation of the sheet-like slide type dust seal sheet, and leakage between the tube sheet sleeve and the element upper sleeve is prevented. Also, the powder seal prevents gas leakage even more sufficiently. Moreover, since the upper end surface of the ceramics tube filter element is always in contact with the receiving plate surface of the element upper sleeve via the sheet packing, leakage is prevented. (B) In the invention (3), when the high temperature dust-containing gas is introduced, an elongation difference is generated in the axial direction between the ceramic tube filter element and the tube sheet sleeve. Since there is nothing to constrain this elongation difference, it can freely expand and contract. On the other hand, with respect to the pressure difference, the powder seal and the labyrinth seal prevent gas leakage. (C) In the invention (4), the hot dust-containing gas is introduced from the upper end of the element upper sleeve. At this time, the gas hits the erosion preventive protector, and the erosion and wear of the upper end of the element upper sleeve and the upper end of the tube sheet sleeve are prevented.

Further, the packing damps vibration of the ceramic tube filter element portion during backwashing and prevents gas leakage. (D) In the invention (5), the lower end of the ceramic tube filter element is supported by the tray surface of the element lower sleeve through the sheet packing. Therefore, the ceramic tube filter element is prevented from moving downward when expanding and contracting, and gas leakage is prevented.

As described above, the filter for high-temperature dust-containing gas has good sealing performance and high reliability.

[0010]

【Example】

(1) A first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, a tube sheet sleeve 4 is welded substantially vertically between an upper partition tube sheet upper plate 2 and an upper partition tube sheet lower plate 3. Flange 1 on top of tubesheet sleeve 4
7 is attached.

An element upper sleeve 6 is inserted in the upper portion of the tube sheet sleeve 4. A step is provided on the outer surface of the upper end portion of the element upper sleeve 6, and a powder seal ring 13, a slide structure powder seal 12 mainly composed of ceramic fiber powder, and a powder stop seal ring 11 are sequentially arranged from the bottom in this step portion. ing. A slide type dust seal sheet 9 made of ceramics fiber (silicon carbide or the like) is attached between the upper end surface of the element upper sleeve 6 and the flange 17. The cross section of the dust seal sheet 9 is curved like a channel ring, and one side surface of the cross section, that is, the outer peripheral surface is the upper end surface of the element upper sleeve 6, and the other side surface, that is, the inner peripheral surface is the flange 17.
Installed on each. The mounting portion on one side is attached with a packing pressing ring 7 and bolts 8 are attached. A tubular erosion protector 10 having a collar at one end is attached to the attachment portion on the other side so as to cover the dust seal sheet 9, and a bolt 18 is attached. Furthermore, the other side surface is wavy.

A ceramic tube filter element 5 is coaxially inserted into the tube plate sleeve 4. The upper end surface of the upper sleeve contacts the pan surface a of the lower end surface of the element upper sleeve via the sheet packing 14.

A packing fixing ring 15 is attached to the lower portion of the tube sheet sleeve 4. A steady rest packing 16 is attached between the packing fixing ring 15 and the ceramic tube filter element.

The attachment of the lower end of the ceramic tube filter element 5 is shown in FIG. Element lower sleeve 34
Is attached between the lower partition tube plate upper plate 32 and the lower partition tube plate lower plate 33. The upper end surface of the element lower sleeve 34 is formed on the pan surface a. The lower end surface of the ceramics tube filter element 5 is arranged on the pan surface a of the element lower sleeve 34 via the sheet packing 14.

In the above, when the high temperature dust-containing gas is introduced, an elongation difference is generated between the tube sheet sleeve 4 and the ceramic tube filter element 5. This difference is absorbed by the deformation of the sheet-like curved slide type dust seal sheet 9, and the tube sheet sleeve 4 and the element upper sleeve 6 are absorbed.
Leakage between is prevented. Further, the powder seal 12 prevents gas leakage more sufficiently (backup seal). Further, since the upper end surface of the ceramics tube filter element 5 is always in contact with the pan surface a of the element upper sleeve 6 via the sheet packing 14, leakage is prevented.

The lower end of the ceramic tube filter element 5 is supported by the receiving plate surface a of the element lower sleeve 34 via the sheet packing 14. Therefore, the ceramic tube filter element 34 is prevented from moving downward when expanding and contracting, and gas leakage is prevented.

The packing 16 damps vibrations of the ceramic tube filter element 5 during backwashing and prevents gas leakage.

Further, hot dust-containing gas is introduced from the upper end of the element upper sleeve 6. At this time, the gas hits the erosion protector 10 and prevents the upper end of the element upper sleeve 6 and the upper end of the tube sheet sleeve 4 from being eroded and worn. (2) A second embodiment of the present invention will be described with reference to FIG.

The upper surface of the upper partition tube plate upper plate 2 and the upper end of the tube plate sleeve 4 are mounted flush with each other. A slide type dust seal sheet 9 a is attached between the upper surface of the upper partition tube plate upper plate 2 and the upper end surface of the element upper sleeve 6. The slide type dust seal sheet 9a has an annular plate shape, and the center of its cross section is curved in a convex shape.

A sleeve seal 35 having a brim at the upper end is inserted into the upper portion of the tube sheet sleeve 4. Sleeve seal 3
The lower end of 5 has a labyrinth seal 20, and the central part thereof has a steady rest packing holding sleeve 19. A steady packing 16 is attached between the steady packing holding sleeve 19 and the element upper sleeve 6. Further, an erosion protector 10 is provided.

The packing 21, the collar of the sleeve seal 35, and the outer edge of the erosion preventive protector 1a are sequentially stacked on the upper surface of the upper partition tube plate upper plate 2, and bolts 18 are attached thereto.

In the above, the expansion difference of the ceramics tube filter element 5 is absorbed by the sleeve seal 35 and the slide type dust seal sheet 9a. Further, gas leakage is sealed by the slide type dust seal sheet 9a, the labyrinth seal and the steady rest packing 16 part. (3) A third embodiment of the present invention is shown in FIG.

In this embodiment, an accordion type slide type dust seal sheet 23 is attached instead of the slide type dust seal sheet 9 of the first embodiment. (4) A fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, except for the slide type dust seal sheet 10a of the second embodiment, the upper portion of the steady rest packing holding sleeve 19 of the sleeve seal 35 is lengthened, and the bag packing 13 and the slide structure powder seal are attached to the upper portion from below. 12 and the bag packing 13 are sequentially inserted. Further, an erosion preventive protector 10b having a labyrinth seal 20a is inserted and bolts 18 are attached.

In the above, expansion and gas leakage of the ceramic tube filter element 5 are absorbed and prevented by the labyrinth seals 20 and 20a, the element steady rest packing 16 and the slide structure powder seal 12 respectively.

In the above embodiments, the ceramic tube filter element 5 is located on the axis, and the top and bottom of the ceramic tube filter element 5 are provided with the metal element upper / lower sleeves via the sheet packing 14 to separate the ceramic tube from the original ceramic tube. The seal structure with the tube sheet is substantially converted into the seal structure with the tube sheet and the sleeves for these metal elements. As a result, the problems of dust seal and elongation at high temperature have been solved by seals centering on slide type dust seal sheets. Since they are made of metal, they have the flexibility of mounting. As a result, there are structural problems in the case of directly sealing the ceramic tube and the partition tube plate, damage to the seal part, wear and tear, temperature limitation,
Defects such as maintenance difficulty can be eliminated, and the reliability of the dust remover can be greatly improved.

[0028]

As described above, according to the present invention, it is possible to easily absorb the difference in expansion of the ceramic tube filter element for treating the high temperature dust-containing gas and prevent the gas and dust from leaking.

Further, vibration of the ceramic tube filter element portion is prevented. Furthermore, erosion and wear of the upper part of the sleeve and the upper part of the tube sheet sleeve are prevented.

As described above, the filter for high temperature dust-containing gas has good sealing performance and high reliability.

[Brief description of drawings]

FIG. 1 is a sectional view of the upper structure of a first embodiment of the present invention.

FIG. 2 is a sectional view of a lower part of the embodiment.

FIG. 3 is a sectional view of the upper structure of the second embodiment of the present invention.

FIG. 4 is a sectional view of the upper structure of the third embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of the upper configuration of the fourth embodiment of the present invention.

[Explanation of symbols]

1 Upper partition tube plate 2 Upper partition tube plate upper plate 3 Upper partition tube plate lower plate 4 Tube plate sleeve 5 Ceramic tube filter element 6 Element upper sleeve 7 Packing retaining ring 8 Bolt 9 Sliding dust seal sheet 10 Corrosion protection protector 11 Powder Body stop seal packing 12 Sliding structure Powder seal packing 13 Powder stop sealing ring 14 Sheet packing 15 Packing fixing ring 16 Steady stop packing 17 Flange 18 Bolt 19 Steady stop packing retaining sleeve 20 Gas leak prevention labyrinth structure 21 Packing 23 Accordion slide type Dust seal, sheet 24 Seal packing holding sleeve 31 Lower partition tube plate 32 Lower partition tube plate Upper plate 33 Lower partition tube plate Lower plate 34 Element lower sleeve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Fujino 1-1 1-1 Atsunoura-machi, Nagasaki City Mitsubishi Heavy Industries Ltd. Nagasaki Shipyard Co., Ltd.

Claims (5)

[Claims] 1. An upper part of a tube plate sleeve, which is provided substantially vertically on an upper partition tube plate and has a flange at its upper end, and an upper part inside the tube plate sleeve, which is inserted through a powder seal and has a saucer surface at its lower end face. A sleeve, a sheet-shaped slide type dust seal sheet having an outer peripheral surface attached to the flange of the upper partition tube plate and an inner peripheral surface attached to the upper end surface of the element upper sleeve and having a curved cross section, and a pan surface of the element upper sleeve. A filter element mounting device comprising a ceramic tube filter element arranged substantially coaxially with a sheet packing. 2. The filter element mounting device according to claim 1, wherein the slide type dust seal sheet is an accordion type dust seal sheet. 3. The filter element mounting device according to claim 1, wherein the slide type dust seal sheet is a labyrinth sleeve mounted on the tube sheet sleeve side. 4. The filter element mounting device according to claim 1, wherein an erosion protector for covering an upper end surface of the element upper sleeve and an upper end portion of the tube sheet sleeve, the tube sheet sleeve, the ceramic tube filter element and the element upper portion. A filter element mounting device comprising a packing provided between any of the sleeves. 5. An element lower sleeve which is provided substantially vertically on a lower partition plate and has a saucer surface on its upper end surface, and a ceramics tube whose lower end surface is arranged substantially coaxially on the saucer surface of the element lower sleeve via a sheet packing. A filter element mounting device comprising: a filter element.