JPH08131743A - Structure for attachng ceramic pipe to tube plate - Google Patents

Abstract

PURPOSE: To make a highly sealable attachment possible without giving impact or bending stress to a filter pipe by a method wherein, in a structure for attaching the filter pipe to be incorporated in a dust collecting device to a tube plate, the filter pipe is secured around the peripheral edge of a through hole of the tube plate via a tube fitting made from the combination of a bellows and a universal joint. CONSTITUTION: In a dust collecting device having ceramic filter pipes 15 and 16 installed with their axes direction coinciding with the vertical direction in upper and lower purifying gas chambers 32 and 33 respectively, when the filter pipe 16 is attached to a can body 11, the filter pipe 16 is previously provided with metal rings 17 and 21 fixed to its upper and lower ends respectively, a bellows 18 and a flange 28 fixed to the upper end and a tube fitting 27 fixed to the lower end. The filter pipe 16 is inserted from above the can body 11 into the through holes 20 of tube plates 12 and 13 and a connecting ring 3 of the tube fitting 27 and a tubular seat 31 fixed to a tube plate 14 are securely held together. At the upper end of the filter pipe 16, the flange 28 is fixed to the tube plate 13 and a tubular pressing plate 30 is fixed to a tubular seat 29. The filter pipe 15 is likewise installed in the upper purifying gas chamber 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic tube mounting structure suitable for mounting a ceramic filter tube incorporated in a dust removing device for removing hot dust-containing gas to the tube sheet.

[0002]

2. Description of the Related Art In a coal gasifier or a power plant using a pressurized fluidized bed combustion boiler, a dust remover for removing dust contained in a pressurized hot dust-containing gas is, for example, a special one. It is proposed in Japanese Patent Publication No. 63-40567 and Japanese Patent Publication No. 5-50324. This type of dust remover employs a configuration in which a plurality of tube plates are provided substantially horizontally inside the can, and a ceramic filter tube is attached between the upper and lower tube plates. Since the filter tube expands and contracts separately as the temperature fluctuates, the mounting structure of the filter tube to the tube plate must be a structure that allows expansion and contraction of both.

Particularly, since ceramics is a brittle material, it is easily damaged, and a ceramic filter tube having a large porosity has a small strength and is easily broken when bending stress is applied, so that bending stress is not applied during installation work or its use. It is necessary to adopt such a structure. Therefore, a method of using a bellows to connect the upper end of the ceramic filter tube to the tube plate is proposed in Japanese Patent Laid-Open No. 62-56792, and a structure in which the lower end of the ceramic filter tube is connected to the tube plate. As a Japanese Patent Publication No. 6-57386, a bayonet type spherical joint is proposed.

[0004]

However, the above-mentioned spherical joint is expensive because it requires complicated machining. In addition, it is necessary to leave a small gap in the spherical joint for smooth installation work. May be difficult to remove. In addition, increasing the clearance improves the difficulty of removal, but during operation involving backwashing, the ceramic filter tube may be lifted by lifting force, which may cause undesired shock. There are problems such as.

Further, even if a small amount of dust leaks from the joint portion enters into the space on the clean gas side, the dust leaked by the backwashing operation is trapped on the surface of the ceramic filter tube on the clean gas side for filtering. This is not preferable because it increases the ventilation pressure loss during the process and reduces the processing capacity of the dust removing device.

The present invention has been made in view of the above-mentioned problems of the prior art, is constituted by low-cost parts, prevents impact and bending stress from being applied to the ceramic tube, and An object of the present invention is to provide a structure for attaching a ceramics tube to a tube plate, which can improve the sealing property and prevent an increase in ventilation pressure loss during filtration.

[0007]

In order to achieve the above object, according to the present invention, a total of 4 pairs of connecting rings provided at the upper and lower ends and one pair protruding from each of the connecting rings facing each other are provided. Two connecting rods, an intermediate ring movably locked to the tips of the four connecting rods by pins, and the openings of the two connecting rings are airtightly connected to each other and pass through the inside or outside of the intermediate ring. A lower connecting ring of a pipe joint having a bellows is fixed to a peripheral edge of a through hole of a tube plate provided substantially horizontally in the can body, and is a metal ring attached to a lower end of a ceramics pipe vertically arranged. There is provided a structure for mounting a ceramics tube to a tube plate, wherein the upper connection ring of the tube joint is fixed to the.

Since the upper connecting ring and the lower connecting ring of the pipe joint can be relatively swung while maintaining airtightness, the ceramic connecting pipe and the ceramic connecting pipe are attached when the ceramic pipe is attached to the tube plate. Even if there is a slight angle deviation from the tube sheet, it can be absorbed, and bending stress or the like does not act on the ceramic tube to cause breakage. Also,
Since the connection ring on the lower side of the pipe joint is fixed to the pipe sheet without any gaps, the pipe joint does not float up against the pipe sheet even if a pushing force from below is applied, and the pipe joint and the pipe sheet are not separated from each other. A highly reliable sealing property is secured. Moreover, in this case, the upper connecting ring and the lower connecting ring of the pipe joint are connected through the intermediate ring so that they cannot expand and contract in the axial direction. Even if a stress in the axial direction is applied, the ceramic tube is not lifted and dropped.

In the structure for mounting a ceramics tube to a tube plate according to the present invention, at least one of the both connection rings is provided with a flange, and the flange of the lower connection ring and the peripheral edge of the through hole of the tube plate and / or the upper part of the connection ring. The flange of the connecting ring and the metal ring are preferably fixed by bolts. By tightening with the bolts in this way, it is easy to attach and detach the ceramics tube,
The flange of the lower connecting ring and the pipe plate and the flange of the upper connecting ring and the metal ring can be firmly fastened, and the cost of the pipe joint is reduced.

Further, in the structure for mounting a ceramics tube on a tube plate according to the present invention, a cooling medium chamber for flowing a cooling medium is provided inside the tube plate, and the pipe joint is indirectly provided by cold heat radiation of the cooling tube plate. It can also be cooled. By doing so, even if the ceramics pipe is used in a high temperature environment, deterioration of the durability of the pipe joint, especially the bellows attached thereto, can be prevented.

Examples of the ceramic tube according to the present invention include a filter tube used for removing high-temperature dust-containing gas and a ceramic tube of a heat exchanger. In particular, when the mounting structure of the present invention is adopted for the filter tube made of ceramics, the sealing property between the filter tube and the tube sheet is improved, so that it is possible to prevent leaked dust from entering the clean gas side space,
It is possible to prevent dust that has leaked during backwashing from adhering to the clean gas side surface of the filter tube. As a result, it is possible to prevent an increase in ventilation pressure loss of the filter tube when performing filtration.

A sliding surface is present at a portion where the connecting rod and the intermediate ring are movably locked by the pin. If dust enters the sliding surface, the sliding may not work. Therefore, the intermediate ring is preferably arranged in the space of the bellows on the side where dust-containing gas does not flow.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an essential part of one embodiment of the present invention,
FIG. 2 is a perspective view showing an example of a pipe joint used in the same embodiment. FIG. 1 shows a specific example in which the structure for mounting a ceramics tube to a tube plate of the present invention is applied to the connection of a ceramics filter tube to a tube plate of a dust removing device for removing hot dust-containing gas. There is. However, the application range of the present invention is not limited only to the dust removing device using the ceramic filter tube described below.

In this embodiment, a header (not shown) above the can body 11 is provided with an inlet for dust-containing gas. Inside the can body 11, as shown in FIG.
2, 13, 14 are provided substantially horizontally in the vertical direction at predetermined intervals, an upper clean gas chamber 32 is formed between the tube sheet 12 and the tube sheet 13, and between the tube sheet 13 and the tube sheet 14. A lower clean gas chamber 33 is formed. Each tube sheet 12,
A plurality of through holes 20 for communicating the ceramic filter tubes are formed in the holes 13 and 14.

Further, in the upper clean gas chamber 32 and the lower clean gas chamber 33, ceramic filter tubes 15 and 16 are arranged with their axial directions substantially vertical, respectively. 16 are connected at the position of the tube sheet 13.

A metal ring 17 is provided at the upper and lower ends of the ceramic filter tubes 15 and 16 provided in the upper and lower clean gas chambers 32 and 33 via a buffer member (not shown) such as a heat-expandable mat. , 21 are attached.
The heat-expandable mat referred to herein is a member having a property of expanding to a thickness direction of, for example, about 1.5 to 3 times when heated to some extent, and thereafter maintaining an expanded state even if temperature raising / lowering is repeated. A heat-expandable material such as vermiculite and a ceramic fiber are combined with an organic binder to form a mat. Then, the metal rings 17 and 21 are attached to the outer circumferences of the upper and lower ends of the ceramic filter tubes 15 and 16 with the heat-expandable mat interposed, and the temperature at which the heat-expandable mat expands (for example, 400 ° C. or higher).
By heating to 1, the heat-expandable mat expands and the ceramic filter tube is firmly held by the metal ring. As described above, when the heat-expandable mat expands at a certain temperature or more, it maintains the expanded state even after the temperature becomes about room temperature, so that a sufficient gripping force of the filter tube can be obtained and the seal Sex is also secured.
Further, since the heat-expandable mat has elasticity to some extent, it is possible to absorb the difference in thermal expansion between the ceramic filter tubes 15 and 16 and the metal rings 17 and 21.

The attachment structure of the ceramic filter tubes 15 and 16 to the tube plates 12, 13 and 14 is configured as follows. First, with respect to the upper ends of the filter tubes 15 and 16, the lower end of the metal bellows 18 is attached to the upper surface of the metal ring 17 described above, and the upper ends of the bellows 18 are attached to the metal flanges 19 and 28. The metal flange 19 attached to the upper end of the filter tube 15 attached to the upper clean gas chamber 32 is the tube sheet 12
The outer diameter of the through hole 20 is larger than that of the through hole 20 and is fixed to the upper surface of the tube sheet 12 by a bolt (not shown).

On the other hand, the lower ends of the filter tubes 15 and 16 are connected to the tube plates 13 and 1 via a tube joint 27 with a universal joint shown in FIG.
4 is fixed to the peripheral edge of the through hole 20. The pipe joint 27 shown in FIG. 2 includes connection rings 2 and 3 with flanges, each of which is made of metal, an intermediate ring 4, and a metal bellows 1,
A pair of connecting rods 5 are projectingly provided on each of the connecting rings 2 and 3 so as to face each other. For the two connecting rings 2 and 3,
The connecting rods 5 are arranged facing each other at a position displaced by 90 ° in the circumferential direction of the connecting ring, and the tips of these four connecting rods 5 are movably connected to the intermediate ring 4 by pins 6. Therefore, the upper connecting ring 2 can rotate with respect to the intermediate ring 4 about the axis X shown in FIG. 2, and the lower connecting ring 3 can rotate with respect to the intermediate ring 4 about the axis Y. It will be possible. As a result, the upper connection ring 2 and the lower connection ring 3 are relatively swingable. Moreover, since the upper connection ring 2 and the lower connection ring 3 are fixed by the pin 6 via the intermediate ring 4, they do not expand or contract in the axial direction. In addition, the metal bellows 1 connects the opening 7 of the upper connection ring 2 and the opening 7 of the lower connection ring 3 in an airtight manner.
The bellows 1 is provided so as to penetrate through the intermediate ring 4, and the bellows 1 also bends as the upper and lower connecting rings 2 and 3 swing.

The positions of the bellows 1 and the intermediate ring 4 are
Reversed as required, ie intermediate ring 4 with bellows 1
It can also be provided inside. Further, each member of the pipe joint 27 is preferably made of a heat resistant metal such as stainless steel.

In the example of FIG. 1, the connection ring 2 on the upper side of the pipe joint 27 is fixed to the metal ring 21 attached to the lower ends of the filter pipes 15 and 16 by bolts (not shown). Various structures are conceivable as a structure for attaching the upper and lower connection rings 3 to the metal ring 21 and the tube plates 13 and 14. For example, in the upper clean gas chamber 32 shown in FIG. 1, the lower connection ring 3 of the pipe joint 27 is attached to the tube sheet 13 with the metal flange 28 and the annular receiving seat 29 interposed. That is, the connection ring 3 on the lower side of the pipe joint 27 is fixed to the metal flange 28 attached to the upper end of the filter pipe 16 provided in the lower clean gas chamber 33 with a bolt (not shown), and the metal flange 28 is an annular receiving seat that is previously fixed to the tube sheet 13
Then, the annular pressing plate 30 is fixed to the annular receiving seat 29. As a result, the metal flange 28, to which the lower connection ring 3 of the pipe joint 27 is fixed, has the annular receiving seat 29.
It will be pinched by the annular holding plate 30.

In this way, below the filter pipe 15 provided in the upper clean gas chamber 32, the lower clean gas chamber 3 is provided.
The connection ring 3 on the lower side of the pipe joint 27 is fixed to the annular receiving seat 29 via the metal flange 28 so that the filter pipes 16 provided on the pipe 3 communicate with each other. However, the lower connecting ring 3 of the pipe joint 27 can be directly fixed to the annular receiving seat 29 or the pipe sheet 13. The filter tube 16 provided in the lower clean gas chamber 33 shown in FIG. 1 has no other filter tube connected to the lower side thereof, so that the lower side of the pipe joint 27 attached to the filter tube 16 is concerned. The connecting ring 3 is fixed to the annular receiving seat 31 fixed to the tube sheet 14 by bolts (not shown). In this way, the lower connecting ring 3 of the pipe joint 27 can be fixed directly or indirectly to the pipe sheet.

The clean gas chamber of the dust remover shown in FIG. 1 is composed of two chambers, an upper stage and a lower stage, but for a dust remover having three or more clean gas chambers above and below,
The tube plate 1 shown in FIG. 1 shows the attachment structure to the uppermost tube plate.
2 and the intermediate tube plate attachment structure is the tube plate 13 shown in FIG. 1, and the lowermost tube plate attachment structure is also the tube shown in FIG. A structure for attaching to the plate 14 may be used.

In the embodiment shown in FIG. 1, the pipe joints 27 are provided in both the upper clean gas chamber 32 and the lower clean gas chamber 33. The structure for attaching the tube sheet is preferably applied to at least the tube sheet having a clean gas chamber for performing the backwash operation therebelow. For example, in the dust remover shown in FIG. 1, it is preferable to provide it in at least the upper clean gas chamber 32. This is because when the backwash operation is performed in the lower clean gas chamber 33, the atmospheric pressure in the lower clean gas chamber instantaneously rises and the backwash gas flows into the filter tube 16.
This is because the force of floating the filter tube 15 provided in the upper clean gas chamber 32 works.

In the ceramic pipe mounting structure with the pipe joint 27 of the present invention, the lower connecting ring 3 of the pipe joint 27 is piped via the metal flange 28, the annular receiving seat 29 and the annular pressing plate 30. The lower connecting ring 3 of the pipe joint 27 fixed to the plate 13 and further fixed to the tube plate 13 and the upper connecting ring 2 of the pipe joint 27 fixed to the filter pipe 15 are the intermediate ring 4 Since the filter tube 15 is connected so as not to expand and contract in the axial direction through the filter tube 15, the filter tube 15 does not float even if backwashing is performed in the lower clean gas chamber 33, so that no impact is applied.

The side wall of the can 11 is provided with a clean gas extraction pipe 34 corresponding to the upper clean gas chamber 32 and the lower clean gas chamber 33, respectively. It is led out of the system via 34. Further, the clean gas extraction pipe 34 is provided with a diffuser 24 in which the diameter of the can body side is expanded and the opposite side of the can body is contracted, and the diffuser 24 is opened downstream of the throat portion 25 toward the can body 11 side. An ejector nozzle 26 is provided. The ejector nozzle 26 is connected to a source of high-speed airflow (not shown) such as a cylinder of compressed air or a compressor, and when the high-speed airflow is ejected from the ejector nozzle 26 toward the can body 11 side in a pulse shape. The backwash gas is introduced into the clean gas chambers 32 and 33 by the ejector effect, and the dust adhering to the inner walls of the ceramic filter tubes 15 and 16 can be removed to regenerate the filter tubes. In addition, it is preferable to set such a backwashing operation to be sequentially performed for each clean gas chamber. That is, even if the backwash operation is performed in a certain clean gas chamber, if the dust removing operation is continued in another clean gas chamber, the dust removing operation is not completely interrupted.

Next, a procedure for mounting the filter tube on the can body will be described. First, in the dust remover shown in FIG. 1, the inner diameter of the through hole 20 formed in the tube sheets 12, 13, and 14 is R ₁ , and the filter tube 16 provided in the lower clean gas chamber 33 is attached to the upper end. The outer diameter of the metal flange 28 is r ₁ , the inner diameter of the opening of the annular receiving seat 29 attached to the upper surface of the tube sheet 13 is R ₂ , and the upper and lower connecting rings 2 and 3 of the pipe joint 27 and the metal ring 17, When the outer diameter of 21 is r ₂ , in the present embodiment, the respective members are formed so that the relationship of R ₁ > r ₁ > R ₂ > r ₂ is established.

Then, the annular receiving seat 29 is fixed to the tube sheet 13 of the can body 11 in advance, and the annular receiving seat 3 is attached to the tube sheet 14.
Keep 1 fixed. On the other hand, the metal rings 17 and 21 are previously fixed to the upper and lower ends of the filter tube 16 mounted in the lower clean gas chamber 33, the bellows 18 and the metal flange 28 are fixed to the upper end of the filter tube 16, and the filter tube 16 is also fixed. The pipe joint 27 is fixed to the lower end of the. The filter tube 16 pre-assembled in this way is inserted from above the can body 11 through the through holes 20, 20 of the tube sheet 12 and the tube sheet 13, and the lower side of the pipe joint 27 attached to the lower end of the filter tube 16 is inserted. An annular receiving seat 31 previously fixed to the connecting ring 3 and the tube sheet 14.
And are fixed with bolts. In this case, as described above, the upper and lower connecting rings 2 and 3 of the pipe joint 27 and the metal ring 1
The outer diameter r _{2 of} 7, 21 is the inner diameter R ₁ of the through hole 20 formed in the tube sheets 12, 13, 14 and the inner diameter R ₂ of the opening of the annular receiving seat 29 attached to the upper surface of the tube sheet 13. Since it is formed smaller, the filter tube 16 can be smoothly inserted into the clean gas chamber 33 from above the can body 11.

Also, the pre-assembled filter tube 16
The upper end of the inner diameter R ₂ of the opening of the annular receiving seat 29.
A metal flange 28 having a larger outer diameter r ₁ is previously attached to the tube sheet 1.
The metal flange 28 is fixed to the annular receiving seat 29 by placing it on the annular receiving seat 29 fixed to the No. 3 and fixing the annular pressing plate 30 to the annular receiving seat 29.

When the filter tube 16 is attached to the lower clean gas chamber 33 in this manner, the upper clean gas chamber 32 is next installed.
Attach the filter tube 15 to the. In this case as well, as in the case of mounting in the lower clean gas chamber 33, in advance outside the can body 11,
Metal rings 17 and 21 are respectively provided on the upper and lower ends of the filter tube 15.
The bellows 18 and the metal flange 19 are fixed to the upper end of the filter tube 15, and the pipe joint 27 is fixed to the lower end of the filter tube 15. Then, the filter tube 15 pre-assembled in this way is inserted from above the can body 11 through the through hole 20 of the tube sheet 12, and the lower connection ring 3 of the pipe joint 27 attached to the lower end of the filter tube 15 is attached. , Metal flange 2 fixed to the tube sheet 13 first
Fasten to 8 with bolts. The upper end of the pre-assembled filter tube 15 has a metal flange 19
Is placed on the tube sheet 12, and the metal flange 19 is directly fixed to the tube sheet 12 with a bolt.

In this embodiment, the pre-assembled ceramic filter tubes 15 and 16 are inserted from above the can body 11 into the through holes 20 and 20 of the tube plates 12 and 13 and fixed by bolts. Therefore, it is possible to repeat the installation work and the replacement work of the filter tube in a short time.

FIG. 3 is a sectional view showing a main part of a dust remover according to another embodiment of the present invention. In this embodiment, the can body 1
1, 9 are divided into clean gas chambers 32 and 33, and the tube plates 12 and 1 are provided above and below the clean gas chambers 32 and 33, respectively.
0, 13, and 14 are formed. Also, each tube sheet 1
2, 10, 13, and 14 are formed thicker than the tube sheet shown in FIG. 1, and a cooling medium chamber 8 for flowing a cooling medium is formed therein. Chilled tube sheet 12,10,1
3, 14 are filter tubes 1 provided in the cans 11, 9.
The bellows 18 attached to the upper ends of the pipes 5 and 16 and the pipe joint 27 attached to the lower ends of the filter pipes 15 and 16 are provided at positions where they are indirectly cooled by cold heat radiation, and a cooling medium supply source (not shown) is provided. ) From which a cooling medium such as water is circulated.

Ceramic filter tubes 15 and 16 provided in the clean gas chambers 32 and 33, metal rings 17 and 21,
The bellows 18 and the metal flange 19 have the same structure as that of the embodiment shown in FIG. 1, but the lower connecting ring 3 of the pipe joint 27 is provided with a flange having an outer diameter larger than that of the upper connecting ring 2. A tube sheet 10 provided below the cans 11 and 9;
It is directly fixed to the lower surface of 14. In this way, by directly connecting the lower connection ring 3 of the pipe joint 27 to the pipe sheets 10 and 14, in addition to the cooling radiation from the cooling pipe sheets 10 and 14 to the pipe joint 27, A cooling effect can also be obtained by direct heat conduction to the lower connecting ring 3.

If the temperature of the gas flowing in the ceramic tube is high and the heat resistance of the bellows is insufficient even if such measures are taken, a cylindrical shield having a heat insulating effect is arranged inside the bellows. The temperature of the bellows can be lowered by flowing the high temperature gas through the cylindrical shield.

In this embodiment, the ceramic filter tubes 15 and 16 are attached to the can bodies 11 and 9 in the following procedure. First, the can bodies 11 and 9 are cut off at their connecting portions, and the tube sheet 1 provided at the bottom of each can body 11 and 9 is cut off.
The connection ring 3 with a flange on the lower side of the pipe joint 27 is fixed to the lower surfaces of 0 and 14 with bolts (not shown). on the other hand,
Metal rings 17 and 21 are fixed to the upper and lower ends of the filter tubes 15 and 16 outside the cans 11 and 9, respectively, and a bellows 18 and a metal flange 19 are fixed to the upper ends of the filter tubes 15 and 16.

The filter tubes 15 and 16 preliminarily assembled in this manner are inserted from above the can bodies 11 and 9 into the can body 1.
Through holes 20 of tube sheets 12 and 13 provided on the upper portions of 1, 9
The metal flange 19 into the tube sheet 12, 1
It is fixed to the upper surface of 3 with a bolt (not shown). At the same time, the metal ring 21 attached to the lower ends of the filter tubes 15 and 16 is bolted (not shown) to the upper flanged connection ring 2 of the pipe joint 27 which is previously attached to the lower tube sheets 10 and 14. Fix it. After the filter tubes 15 and 16 are attached to the cans 11 and 9 in this procedure, the cans 11 and 9 are stacked and assembled. When the structure of this embodiment is adopted, the assembling and disassembling work becomes easy, especially when the can body has a size and weight that can be easily disassembled. In addition, there is an advantage that the assembly or replacement can be selectively performed only for the required can body.

[0036]

According to the present invention, since the pipe joint does not require complicated machining such as a spherical joint, the cost can be reduced. Further, since the pipe joint is configured to be swingable, bending stress does not occur even when the ceramic pipe is inclined during the assembly or operation of the ceramic pipe, so that the ceramic pipe is not broken.

Further, since the pipe joint according to the present invention can be tightly fixed to the pipe plate, the sealing property between the ceramic pipe and the pipe plate is excellent, and gas and dust do not leak out. Further, since the pipe joint is constructed so as not to be able to expand and contract in the axial direction, the ceramic pipe does not float even if a force for levitating the ceramic pipe is applied, and the ceramic pipe does not drop and receive an impact.

In the present invention, at least one of both connecting rings is provided with a flange, and the flange of the lower connecting ring and the peripheral edge of the through hole of the tube sheet and / or the flange of the upper connecting ring and the metal ring are fixed by bolts. With this structure, the ceramic pipe can be easily attached and detached, and the lower flange and the tube plate and the upper flange and the metal ring can be firmly fastened, and the cost of the pipe joint can be reduced.

Further, in the present invention, if the cooling medium chamber for flowing the cooling medium is provided inside the tube plate and the pipe joint is indirectly cooled by the cold heat radiation, the ceramic pipe is used in a high temperature environment. However, the durability of the pipe joint is secured.

Furthermore, when the mounting structure of the present invention is adopted for mounting the ceramic filter tube of the dust removing device,
Since the sealing property between the filter tube and the tube plate is improved, it is possible to prevent dust from leaking into the space on the clean gas side, and prevent dust that has leaked during the backwash operation from adhering to the clean gas side surface of the filter tube. It is possible to prevent an increase in ventilation pressure loss of the filter tube during filtration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a dust remover according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a pipe joint according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a main part of a dust remover according to another embodiment of the present invention.

[Explanation of symbols]

 1 ... Bellows 2,3 ... Connection ring 4 ... Intermediate ring 5 ... Connecting rod 6 ... Pin 7 ... Opening 8 ... Cooling medium chamber 9,11 ... Can body 10,12,13,14 ... Tube sheet 15,16 ... Filter Pipe (ceramics pipe) 17, 21 ... Metal ring 20 ... Through hole 27 ... Pipe joint

Claims (5)

[Claims] 1. A connecting ring provided at both upper and lower ends, a total of four connecting rods each facing each other projecting from the connecting rings, and a pin at the tip of each of the four connecting rods. A lower connecting ring of a pipe joint, which has an intermediate ring that can be locked and a bellows that airtightly connects between the openings of the two connecting rings and that passes through the inside or the outside of the intermediate ring, is generally formed in the can body. The connection ring on the upper side of the pipe joint is fixed to a metal ring fixed to the peripheral edge of the through hole of the tube plate provided horizontally and attached to the lower end of the ceramics tube arranged in the vertical direction. A structure for attaching a ceramics tube to a tube plate. 2. At least one of the both connecting rings is provided with a flange, and the flange of the lower connecting ring and the peripheral edge of the through hole of the tube sheet and / or the flange of the upper connecting ring and the metal ring are bolted. The structure for mounting the ceramic tube to the tube sheet according to claim 1, which is fixed. 3. A ceramic tube according to claim 1, wherein a cooling medium chamber for flowing a cooling medium is provided inside the tube sheet, and the pipe joint is indirectly cooled by cold heat radiation. Mounting structure. 4. The structure for mounting a ceramics tube to a tube plate according to claim 1, wherein the ceramics tube is a filter tube used to remove hot dust-containing gas. 5. The structure for mounting a ceramics tube to a tube plate according to claim 4, wherein the intermediate ring is arranged in a space on the side of the bellows where dust-containing gas does not flow.