JPH078730A - Filter element attaching device of duster extractor - Google Patents

Abstract

PURPOSE:To make the elongation difference easily absorbed due to high temp. of a filter element in the filter element attaching device of the dust extractor for high temp. gas of combustion equipment using fossil fuel or the like. CONSTITUTION:A tube plate sleeve 4 is attached to the upper and lower plates 2, 3 of an upper partition tube plate and a powder seal holding ring 7 is inserted in the sleeve 4 along the inner surface thereof to be connected to a flange 14 by a bolt 15. The power seal holding ring 7 has a slide structure power seal 12 held to the interior thereof and is pressed by a press ring 8 and an element upper sleeve 6 is supported so as to be slidable along the inner peripheral surface of the ring 7. A ceramic tube filter element 5 is supported at the lower end of the element upper sleeve 6 through a sheet packing 13 and the elongation difference of the element 6 due to high temp. is absorbed by the sliding of the element upper sleeve 6 through the slide structure powder seal 12.

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 filter element is usually arranged vertically in the dust remover.

As to the sealing or joining between the ceramic pipe filter element vertically arranged in this way and the upper and lower metal partition pipe plates holding the same, the metal pipe,
Welding, screw expansion, metal bellows, and other methods used in the case of metal tube sheets cannot be used simply because they are at high temperatures. As a method that has been used as a conventional technique under adverse conditions such as high gas temperature, elongation, difference in expansion, or dust, although not shown, the ceramic tube filter element is supported on a partition tube plate and the ceramic tube filter element A method of filling a powder layer between the outer peripheral surface and the tube sheet is known, but when this is used in a dust remover, the powder is scattered only when backwashing because the conventional method was simply filling the powder. There is a problem of doing. 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. In this method as well, the plant and the dust removing device slide due to the difference in elongation and wear due to sliding, 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 is insufficient in holding fine particles when the number of sliding times due to elongation is large, the fine particles may fall, and the sealing property is not always sufficient.

[0005]

As described above, the attachment structure of the ceramic tube filter element of the conventional dust remover is such that a powder layer is formed between the outer peripheral portion of the filter element and the supporting tube plate, or the ceramic fiber is used. The sealing material and fine particles such as silica sand are used, but only the powder layer is formed, and the method of holding them and the countermeasures on the sealing surface are not sufficient. Therefore, the powder may scatter during backwashing,
Or, in the structure where other sealing material is inserted or wound, the seal part may be damaged, or the sealing property of the sealing member may be insufficient due to sliding wear due to elongation or the like. However, when processing high-temperature gas, there have been problems such as the need for a cooling unit on the tube sheet or the like, or the difficulty in attaching / detaching the joint.

[0006]

In order to solve the above-mentioned problems, the present invention has a powder seal holding ring attached to a tube plate sleeve provided substantially vertically on an upper partition tube plate, and has a slide structure powder seal. Are held on this powder holding ring.
An upper sleeve of the element is slidably held by the tube sheet sleeve through the powder seal of the sliding structure, and a ceramic tube filter element is attached to the lower end of the sleeve through a seal member. With such a structure, the deformation of the ceramic tube filter element due to the high temperature gas can be released by sliding.

That is, according to the first aspect of the invention, a tube sheet sleeve which is provided substantially vertically on the upper partition tube sheet and has a flange at the upper end, and a tube sheet sleeve attached to the flange of the tube sheet sleeve, A powder seal holding ring inscribed in the upper part, an element upper sleeve inserted through a powder seal holding slide on the inner peripheral surface of the powder seal holding ring and having a saucer surface at the lower end surface, Provided is a filter element mounting device for a dust removing device, which comprises a ceramic tube filter element arranged substantially coaxially with a sheet packing on a tray surface of an element upper sleeve.

According to the invention of claim 2, claim 1
In the invention of claim 1, the slide structure powder seal includes a ceramic fiber powder, a ceramic felt which is vertically in contact with the powder around the powder, and a ceramic rope which is vertically in contact with the outside of the ceramic felt. And the inner circumference of the powder seal holding ring, and a pressing ring for pressing the ceramic rope, the ceramic fiber powder and the ceramic felt is arranged on the upper ceramic rope. It is a feature.

[0009]

According to the present invention, as described above, according to the first aspect of the present invention, when a high temperature dust-containing gas is introduced into the device, an elongation difference is generated between the ceramic tube filter element and the tube sheet sleeve in the axial direction. Occurs. Sliding and releasing this difference between the element upper sleeve provided on the upper part of the ceramic tube filter element through the sheet packing and the slide structure powder seal held by the powder seal holding ring. At the same time, it withstands the differential pressure between the dust-containing gas side and the dust-removed gas side, and at the same time, the dust naturally exhibits a sufficient sealing function against gas leakage.

According to the second aspect of the present invention, in addition to performing the above-mentioned operation, the powder is scattered during normal operation and also during backwashing for removing dust adhering to the filter element tube, which is performed intermittently. To prevent this, two layers of ceramic rope and felt are provided on both the upper and lower sides to provide a guard, and a pressing ring is placed on top of this to press the powder seal.

Further, since the upper end surface of the ceramics tube filter element is in contact with the receiving surface of the upper sleeve of the element through the sheet packing in a stationary state and under pressure by the sleeve weight, leakage is prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. FIG. 1 is a vertical sectional view of a filter element mounting device of a dust removing device according to an embodiment of the present invention,
FIG. 2 is a detailed view of the part A. In both figures, 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 of an upper partition tube sheet 1.
A flange 14 is integrally formed on the upper end of the tube sheet sleeve 4. An upper element sleeve 6 is slidably inserted in the tube plate sleeve 4 in the vertical direction. This element upper sleeve 6 has a receiving plate surface 6a for supporting the ceramics tube filter element 5 through the sheet packing 13 at the lower end, and the lower outer peripheral surface has the tube plate sleeve 4
Has an outer peripheral surface 6b at the lower end portion which is in contact with the inner peripheral surface.

A powder seal retaining ring 7 is inserted between the tube sheet sleeve 4 and the element upper sleeve 6, and the powder seal retaining ring 7 has a flange portion on the upper portion thereof. The recess 14 is connected to the flange 14 with a bolt 15, the lower inside is inscribed in the element upper sleeve 6, and the slide structure powder seal 12 is inserted between the upper sleeve 6 and the outer periphery of the upper sleeve 6 to open upward. Are formed. This powder seal 12 is A
As shown in FIG. 2 of the details of the part, a ceramic rope 9, a ceramic felt 10, a ceramic fiber powder 11 in the center, and a ceramic felt 10 and a ceramic rope 9 thereon are arranged therein from below. The structure is such that the powder 11 is sandwiched between the ceramic felt 10 and the ceramic rope 9 from above and below. A metal pressing ring 8 is inserted in the uppermost portion of the recess 20 and holds a slide structure powder seal 12.

The above-mentioned ceramic felt 10 and ceramic rope 9 are resistant to high-temperature gas and are knitted in a fibrous form. Since they are made of powder, felt and rope, they prevent the passage of fine powder 11. The gas is allowed to pass through, and the structure prevents dust in the gas from passing through. Further, the ropes and felts are configured so that their cross sections are in conformity with the cross-sectional shape of the dent 20, that is, the length of the dent 20 and the size of the gap, and are pressed by the holding ring 8 to be in close contact with each other. No dust or powder 11 leaks from between the powder seal holding ring 7 and the ceramic felt 10 or the ceramic rope 9.

According to the present mounting device having the above-described structure, the upper end of the ceramic tube filter element 5 is axially fixed in order to receive a load through the sheet packing 13. Therefore, when the dust remover operates and the hot dust-containing gas is introduced, the ceramic tube filter element 5 extends upward. This elongation is caused by the movement of the upper partition tube sheet 1 side that moves in connection with the can body of the apparatus, that is, the tube sheet sleeve 4 or the powder seal holding ring 7 and the slide structure powder seal 12 that are connected thereto. There will be relative movement in the form of a differential.

This relative movement has a pan-shaped lower end, and slides between the element upper sleeve 6 provided on the upper portion of the ceramic tube filter element 5 and the slide structure powder seal 12 via the sheet packing 13. It appears to move and absorbs the deformation due to thermal expansion, and escapes this elongation difference.

Regarding the possibility that fine dust or powder 11 may permeate and leak from this slide structure powder seal 12, the ceramic felt 10 and the ceramic rope 9 may be vertically moved around the powder 11. The sealing method of the above-mentioned structure, which is arranged to protect these leaks, has no problem with the sealing property and can withstand a long-term operation including the problem of backwashing.
Further, since the sheet packing 13 is in an environment in which it is stationary and under pressure, the sealing property can be maintained without any problem.

In the embodiment, the metal element upper sleeve 6 is provided on the axial center of the ceramics tube filter element 5 through the sheet packing 13, which means that the original ceramics tube filter element 5 and the upper partition tube plate are provided. The problem of the seal structure with 1 is substantially converted into the problem of the seal structure between the upper partition tube sheet 1 and the upper sleeve 6 of the metal element. As a result, the problem of dust seal and elongation at high temperature can be solved by a seal method centering on the slide structure powder seal 12,
Further, various problems and defects in the case where the ceramic tube filter element 5 and the partition tube plate 1 are directly sealed can be eliminated, and the reliability of the dust removing device can be greatly improved.

[0019]

As described above, according to the present invention, the mounting of the ceramic tube filter element has a structure considering deformation due to heat. Therefore, the high temperature of the ceramic tube filter element for treating high temperature dust-containing gas is treated. The expansion difference of thermal expansion due to dust-containing gas can be easily absorbed by the support structure of the upper partition plate, and gas and dust leakage can be prevented, and the sealing performance is good as a filter for high-temperature dust-containing gas, and it is highly reliable. It can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a filter element mounting device of a dust removing device according to an embodiment of the present invention.

FIG. 2 is a detailed view of part A of FIG.

[Explanation of symbols]

 1 Upper Partition Tube Plate 2 Upper Partition Tube Plate Upper Plate 3 Lower Partition Tube Plate Lower Plate 4 Tube Plate Sleeve 5 Ceramic Tube Filter Element 6 Element Upper Sleeve 7 Powder Seal Holding Ring 8 Presser Ring 9 Ceramic Rope 10 Ceramic Felt 11 Powder 12 Slide structure powder seal 13 Sheet packing

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tetsuya Fujino 1-1, Atsunoura-machi, Nagasaki-shi Nagasaki Shipyard Ltd. (72) Inventor Yuichiro Kitagawa 1-1, Atsunoura-cho, Nagasaki-shi Nagasaki Shipbuilding In-house

Claims (2)

[Claims] 1. A tube sheet sleeve which is provided substantially vertically on an upper partition tube sheet and has a flange at an upper end, and a powder seal which is attached to a flange of the tube sheet sleeve and inscribes in an upper part of the tube sheet sleeve. A holding ring, an element upper sleeve having a tray surface on the lower end surface, which is inserted through a slide structure powder seal held on the inner peripheral surface of the powder sealing holding ring, and a sheet on the tray surface of the element upper sleeve. A filter element mounting device for a dust removing device, comprising: a ceramics tube filter element disposed substantially coaxially with a packing. 2. The slide structure powder seal comprises a ceramic fiber powder, a ceramic felt which is vertically in contact with the ceramic fiber centered on the powder, and a ceramic rope which is vertically in contact with the outside of the ceramic felt. The ring is arranged in the gap between the surface and the inner peripheral surface of the powder seal holding ring, and a pressing ring for pressing the ceramic rope, the ceramic fiber powder and the ceramic felt is arranged on the upper ceramic rope. A filter element mounting device for a dust removing device according to claim 1, wherein: