JPH01281120A - Supporting structure of ceramic tubes in gas system - Google Patents

Abstract

PURPOSE:To decrease shift strain to be applied on connecting parts by joining via a packed layer in the outer circumference of the end of a tube, an annular holding jig made of a metal making contact with the end surface of the tube, and supporting the annular holding jig abutting on a tube plate below. CONSTITUTION:A plurality of tube plates 13-16 are stacked almost vertically in a can body 11, and ceramic tubes 17-19 are supported so as to make their axial center almost perpendicular and have through connections between their inside flow passage and a through-hole formed in the tube plates between two up and down tube plates adjoining each other, and supporting structure is thus composed. Packed layers 66 (e.g., ones molded into mats from thermally expansive inorganic materials such as perlite and ceramic fibers with organic binders) are placed in the outer circumferences of the ends of the ceramic tubes and annular holding jigs 64 made of a metal are joined with letting have a contact with the end surfaces of the tubes, and the annular holding jigs 64 are supported by having contact with tube plates below. As a result, the packing layers, which are connecting parts formed between an annual holding jig and the end circumference of a ceramic tube, are prevented from being damaged.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to support of a ceramic tube in a gas system that is used by being installed approximately vertically between upper and lower tube sheets provided approximately horizontally within a can. The present invention relates to a structure, and particularly to a support structure for a ceramic tube body in a gas system used to support a reduced tube made of breathable porous ceramics on a tube plate.

"Prior Art and its Problems" In recent years, various dust removal devices using a porous porous ceramic seed part have been proposed in order to remove dust contained in, for example, high-temperature exhaust gas.

In these dust removal devices, a plurality of tube sheets are installed approximately horizontally in the can body, and the seed section is supported between the adjacent upper and lower tube sheets with the axis generally vertical, and the dust removal device is installed inside or outside of the seed section. Dust gas is introduced and taken out as clean gas from the outside or inside of the five filter tubes, and the dust is captured on the wall surface of the reduced tube.

In these dust removal devices, the seed part is made of ceramics, and the can body and tube plate are made of metal, with the aim of using them in high temperatures and corrosive atmospheres where the durability of metal materials is problematic. Apply cooling accordingly.

For this reason, it absorbs the difference in thermal expansion between components as the temperature rises and falls, especially between ceramic and metal members, and there is no risk of damaging the ceramic seed part, which is vulnerable to impact, during installation or during installation. No support structure is required.

For this reason, a metal annular body is attached to the end of the easily damaged ceramic seed part via a buffer member, and this annular body is made to allow axial displacement via a metal bellows etc. Efforts have been made to connect it to the end of the ceramic seed making part in the vertical direction, to the tube plate, etc.

FIG. 4 shows an example of this type of dust removal device that the applicant has already proposed (Japanese Patent Laid-Open No. 62-123295
, Japanese Patent Publication No. 63-38792).

In FIG. 4, an inlet for dust-containing gas is provided in a header (not shown) above the can body 11, and a dust hopper (not shown) is provided below.

Inside the can body 11, there are four stages of tube plates 1 in this example.
3.14.15.16 are installed approximately horizontally at predetermined intervals in the vertical direction, and between these tube sheets 13 to 16,
Three seed portions 17, 18, and 19 are arranged one above the other, and are connected and supported to each other so that the channels in the tube communicate with each other.

Although not shown in the figure, in reality, the reduced cylinder details connected and supported so as to communicate vertically are connected to the can body 11.
A common configuration is that a plurality of rows are provided in a state substantially parallel to each other.

Moreover, clean gas extraction pipes 12 are provided on the peripheral wall of the can body 11, corresponding to each of the compartments partitioned by tube sheets.

To explain the connection and support structure of the gaps 17, 18, and 19 arranged above and below, taking the gaps 17 as an example, as shown in FIG. A pair of annular bodies 21 and 22 are arranged above and below to sandwich the flange 20, and the bolts 23 are used to securely tighten the flange 20.

The lower edge of a metal bellows 24 is attached to the upper side of the annular body 21, and the upper edge of the bellows 24 is connected to a support plate 26 attached to the tube plate 13 with bolts 25.

Here, the annular bodies 21, 22, the bellows 24, the support plate 26, and the tube plate 13 are all made of metal.

Therefore, the upper end of the gap 17 is connected and supported to the tube plate 13 via the flange 20, the annular body 21.22, the bellows 24, and the support plate 26, and the bellows 24 can absorb displacement in the axial direction. There is.

The tube plate 13 is water-cooled from the inside, and is configured to indirectly cool metal members such as the bellows 24 through the effect of heat radiation, providing heat resistance to the entire system and eliminating the need for cooling. This makes it possible to process high-temperature or corrosive dust-containing gases that other metal systems cannot handle.

Further, as shown in FIG. 6, a filling layer 27 made of a buffering material whose main components are a thermally expandable inorganic material and ceramic fibers is provided on the outer periphery of the lower end of the interspecies 17. A cylindrical portion 29 of the annular body 28 is attached,
The annular body 28 has a flange portion 30 extending outward from the cylindrical portion 29 .

An annular pedestal 32 is attached to the lower surface of the flange portion 30 via bolts 31, and the outer peripheral surface of the pedestal 32 is formed into a spherical surface.

On the other hand, a tapered seat 3 is provided at the periphery of the through hole of the tube plate 14.
3 is formed, and the pedestal 32 is supported in contact with a receiving seat 33.

Therefore, the lower end portion of the reduced tube 17 is supported in contact with a seat 33 formed around the through hole of the tube plate 14 via the filling layer Z7, the annular body 28, and the pedestal 32.

Furthermore, in this dust removal device, as shown in FIG. The inner diameter of the through hole is D4, the outer diameter of the annular body 28 and pedestal 32 attached to the lower end of the reduced tube 17 is dl, and the outer diameter of the annular body 28 and pedestal 32 attached to the lower end of the reduced tube 18 is d.
2. When the outer diameter of the annular body 28 and the pedestal 32 attached to the lower end of the seed space 19 is d3, DI>di>D2>
d2>D3 and d3>D4.

As a result, the reduced tubes 19, 18, and 17 are sequentially inserted through the through holes of the tube sheet provided at the top of the can body 11 in a state in which they are connected in advance so as to communicate with each other, and the pedestals 32 attached to the lower ends of the tubes are respectively inserted. It can be supported in contact with a seat 33 formed on the periphery of the through hole of the corresponding tube plate 16, 15, 14, making it extremely easy to attach and remove the tube.

On the other hand, as shown in FIG. 4, clean gas take-off pipes 12 are provided corresponding to each section partitioned by tube plates 13 to 16, and a throat portion 34 is formed in each section.

Ejector nozzles 35 that open toward the upstream side of the clean gas flow path are arranged near the downstream side of the clean gas flow path of the throat portion 34 .

The present applicant has proposed that a structure as shown in FIG.
-46395).

That is, a filling layer 36 made of a buffer material whose main components are a thermally expandable inorganic material and ceramic fibers is provided on the outer periphery of the upper end of the interspecies 17, and the annular body 37 is provided through this filling 136.
A cylindrical portion 38 is attached thereto, and the annular body 37 has a flange portion 39 extending outward from the cylindrical portion 38 .

An annular body 41 is attached to the upper surface of the flange portion 39 via bolts 4o, and the lower edge of the bead 24 is connected to this annular body 41.

In this dust removing device (see FIG. 4), a dust-containing gas is introduced from above the can 11 and passed into the gaps 17, 18, and 19 from above.

While the dust-containing gas flows within the interspecies 17.18% 19, the gas component passes through the wall and flows out as clean gas to the outside of the interspecies 17, 18, 19.

At this time, the dust contained in the dust-containing gas is
8.19, most of the dust is then separated by its own weight, falls downward, and is collected in a dust hopper (not shown) provided at the bottom of the can body 11.

The clean gas that has flowed out of the interstices 17, 18, and 19 is taken out of the apparatus through the clean gas take-off pipe 12.

If this kind of dust collection operation continues, interspecies 17.18.19
Dust accumulates on the inner wall surface of the device, and pressure loss increases as gas passes between the seeds, reducing the dust collection ability of the device.

Therefore, compressed gas is ejected from the ejector nozzle 35 at appropriate time intervals to perform a backwashing operation. In order to perform effective backwashing, the gas pressure of the compressed gas must be at least 1.2 times the gas pressure (absolute pressure) inside the vessel, especially at a critical pressure ratio (approximately 1.2 times) where the gas flow velocity at the nozzle exit exceeds the speed of sound. 6) The above is preferable, and the compressed gas jetting mode is to open and close a high-speed response valve that can go from fully open to fully closed within 1 second, preferably within 0.5 seconds, and high-pressure gas is released virtually instantaneously. It is preferable that the liquid be ejected from the ejector nozzle 35 during this period.

The gas ejected from the ejector nozzle 35 entrains surrounding gas at the throat part 34 and flows into the can body as backwash gas accompanied by pressure waves, increasing the gas pressure outside the interspecies 17, 18, 19. Hundreds to 1 more than the internal pressure between each species
5. Raise the temperature to a level as high as OOOmmAq to create an instantaneous gas flow that passes through the wall of the reduced tube 17.18.19 from the outside to the inside, and brushes off the dust that has accumulated on the inner wall surface of the interspecies 17.18.19. .

Note that such backwashing operations are actually performed in turn in each compartment partitioned by tube sheets 13, 14, 15, and 16 in the can body 11, and the backwashing operation of one compartment is During the washing operation, the dust collection operation continues in other compartments, so that the dust collection operation as a whole is not interrupted.

However, the conventional dust removal device as described above has the following problems.

That is, each reduced tube 17, 18, 19 has its lower end connected to the corresponding tube plate 14.1 via the annular body 28 and the pedestal 32.
Each cylinder 17.1 is supported mainly by its own weight on a seat provided at the periphery of the through hole of 5.16.
8. The upper end of 19 is connected and supported via the bellows 24 to the periphery of the through hole in the upper tube sheet or the lower end of the upper tube,
Axial (vertical) displacement is possible.

In this state, if backwash gas is blown into a section partitioned by tube sheets 14, 15, for example, the gas pressure in that section will be higher than the gas pressure in the other sections.

This gas pressure difference is caused by the reduced cylinder 17 located above the reduced cylinder 18.
Apply upward pressure to the pedestal 32 provided at the lower end of the
When the upward force due to this differential pressure exceeds a certain value,
Together with the annular body 28, 32, the interspecies 17 is momentarily pushed up and subsequently falls onto the seat.

When the seed space 17 is pushed up and falls in this way, the bellows 24 attached to the upper end of the reduced tube 17 is instantaneously compressed and returns to the halo, so that Then, an impactive shear stress is applied to the connection between the ceramic flange 20 and the seed 17 (
(See Figure 5).

For this reason, it has been found that accidents in which the flange 20 is damaged often occur.

Also, in the structures shown in FIGS. 6 and 8, the interspecies 17
It has been found that an impactive shear stress acts on the filling layers 27, 36 between the cylindrical portion 38 of the annular body 37 and the filling layers 27, 36 are sometimes damaged.

A similar problem often occurs during installation or maintenance work in which the shim is attached or removed, due to external impact applied to the annular body attached to the end of the ceramic tube.

Even if the reduced tube 17, 18, 19 is pushed up by the pressure of the backwash gas and further falls, the connection between the flange 20 and the tube 17 and the cylindrical portion 27.38 of the annular body 28.37 and the tube 17
It was thought that the shear stress acting on the packed layer 27, 36 between the end of the bellows 24 would be alleviated by the presence of the bellows 24 and would not be a problem. When compressed gas of more than 1 or 2 times the pressure (pressure) is ejected from the ejector nozzle, the cylinder rises and subsequently falls, and the shear stress acts impulsively, causing the flange 20, which is a bond between ceramics, and the cylinder to fall. It has been found that both the connecting portion of the tube 17 and the filling layer 27, 36 made of a cushioning material mainly composed of ceramic fibers and a thermally expandable inorganic material are susceptible to this impact shear stress and are often damaged.

In the case of dust that is easily blown away by backwashing, it is not necessary to make the backwashing differential pressure, that is, the pressure difference between the inside and outside of the species during backwashing, very large, but the gas may contain a small amount of tar, etc. If the material is sticky, it is necessary to increase this backwashing differential pressure and apply the backwashing differential pressure instantaneously.

The filtration differential pressure, that is, the backwashing differential pressure necessary to maintain the pressure difference between the inside and outside of the species at a stable level over a long period of time during dust collection operation, is generally 500 to 15.
It is in the range of 00On+mAq.

The minimum backwash differential pressure that lifts the cylinder placed above varies depending on the design specifications of each part, but is generally 1,000 yen.
~6. It is in the range of OOO nm Aq.

In addition, this push-up force is caused by the pressure of the backwash gas on the bellows 2.
It is considered that a force acting on the outer periphery of the bellows 24 causes the bellows 24 to extend in the axial direction.

``Object of the Invention'' In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a connecting member to be attached to the end of a ceramic tube that is easily damaged, so as to adapt to the actual external force, and to connect the ceramic tube to a gas system. The structure shall be such that damage to the connection part provided at the end of the ceramic tube body can be avoided during installation or removal from the can, and in particular, a backwashing device must be installed. In this method, damage to the ceramic tube-reducing connection part is prevented from sudden upward movement of the cylinder due to the pushing up force on the incorporated ceramic seed-making part, and the impact caused by the subsequent fall of the cylinder. It is an object of the present invention to provide a support structure for a ceramic seed-making part in a dust removal device, and a support structure for a ceramic tube body in a practical gas system that is pressed against pushing up force.

"Structure of the Invention" In the support structure for a ceramic tube body in a gas system according to the present invention, a plurality of tube sheets are provided generally horizontally in the can body, and a through hole is provided in the tube sheet between two adjacent tube sheets of upper and lower layers. A support structure for a ceramic tube in a gas system in which a ceramic tube is supported substantially perpendicularly to its axis so that the internal flow path of the ceramic tube communicates with the tube, wherein a filling layer is provided around the outer periphery of the lower end of the tube. A metal annular holder is engaged through the pipe and in contact with the lower end surface of the tube body, and the annular holder is supported in contact with the lower tube plate.

In a preferred embodiment of the present invention, a metal annular holder is engaged with the outer periphery of the upper end of the tube through a filling layer and in contact with the upper end surface of the tube, and the annular holder is It is substantially supported on the upper tubesheet for axial displacement.

In another aspect of the present invention, a plurality of tube sheets are provided generally horizontally in the can body, and a through hole provided in each tube sheet is communicated between the upper and lower two adjacent tube sheets, and a flow path in the tube of the ceramic tube body is provided. In a support structure for a ceramic tube in a gas system in which a ceramic tube is supported almost perpendicularly to its axis, a metal annular body is engaged with the outer periphery of the lower end of the tube through a filling layer. and the annular body is supported by being in contact with the periphery of the through hole of the lower tube sheet, and an engaging means is provided which is locked to the tube sheet by rotating the annular body together with the ceramic tube body. Movement of the lower end of the ceramic tube is restricted.

In another preferred embodiment of the present invention, the filling layer provided between the lower end outer circumference of the tube and the metal annular body is mainly composed of a buffer material mainly composed of a thermally expandable inorganic material and ceramic fibers. has been done.

In another preferred embodiment of the present invention, the annular holder has a structure in which the annular body engaged with the outer peripheral portion of the lower end of the tubular body is in contact with and engaged with the end surface of the ceramic tubular body.

In another preferred aspect of the present invention, the engaging means that is engaged with the tube sheet includes tongue pieces protruding from a plurality of locations on the outer periphery of the annular body or the annular holder, and a through hole in the tube sheet. It consists of a presser member formed on an annular seat provided on the periphery, and the presser member has a notch into which the tongue piece is inserted when viewed from above, and the annular body or the annular holder is attached to the tube. An engaging means is provided that locks the tongue piece to the tube plate in such a way that the tongue piece is pressed against the lower side of the presser member when the plate is rotated in contact with the periphery of the through hole of the plate.

In another preferred embodiment of the present invention, the ceramic tube is an air-permeable porous reduced tube, and the gas system is a dust removal device.

In another preferred embodiment of the present invention, in the support structure for a ceramic tube body according to the present invention, the dust removal device is configured to perform regeneration by backwashing operation, and damage mainly occurs at the ends or connecting portions of the ceramic tube body. This causes the impact shear stress to be received as a compressive stress applied to the end face of the ceramic tube, taking advantage of the fact that brittle materials such as ceramics are relatively strong against compression.

For example, in a dust removal device, when pressure from backwashing gas is applied to one of the compartments partitioned by a tube plate and the ceramic cylinder suddenly moves upwards, or when it subsequently falls, the cylinder A strong axial force acts on the annular body attached to the end of the

Furthermore, it is difficult to avoid applying a similar axial force when installing or removing a ceramic tube into or from a gas system can.

However, according to the support structure for the ceramic tube of the present invention, the annular holder attached to the end of the ceramic tube substantially engages with the end surface of the ceramic tube, so the shaft attached to the annular holder is The force in the direction mainly acts as a pressing force applied between the annular holder and the end surface of the ceramic tube, and the shearing stress is substantially applied to the filling layer provided between the annular holder and the peripheral surface of the end of the ceramic tube. It almost never occurs.

Therefore, damage to the filling layer provided between the annular holder and the circumferential surface of the cylinder can be prevented.

Due to the structure of these attachments according to the present invention, the ends of the ceramic tube, especially when installing or removing the porous ceramic seed part into the can body, can be removed from the can body. Alternatively, it is possible to avoid damage to the end portion of the ceramic tube body or the connecting portion due to an impact applied to the connecting member attached to the end portion.

Up to now, various structures have been proposed in which the outer periphery of the end of a ceramic tube is held by a metal annular body in a dust removal device. The structure of is unknown.

This is thought to be because the conventional support structure focused only on supporting the weight of the ceramic tube.

According to another aspect of the present invention, the ceramic tubes are inserted in a communicating state through the through holes of the tube sheet provided at the top of the can body, and the annular shaped tubes are attached to the ends of the respective ceramic tubes. The body or the annular holder can be supported in contact with the periphery of the through hole of the corresponding tube sheet, and in that state, the annular body or the annular holder can be engaged with the tube sheet by rotating the annular holder together with the ceramic tube. I can do it.

As a result, it is possible to restrict the vertical movement of the ceramic tube body or reduced cylinder to prevent its breakage or leakage of backwash gas from the dust removal device, and improve reliability when using the gas system. .

Furthermore, it facilitates the installation and removal of a ceramic tube in a high-temperature gas system, particularly a ceramic porous reduced cylinder in a dust removal device.

Although the embodiments of the present invention have been described above with reference to examples in which they are simply applied to porous ceramic tubes, the present invention can also be preferably used as a support structure for the tube body of a high-temperature heat exchanger using ceramic tubes. .

Embodiment FIGS. 1 and 2 show an embodiment in which the support structure for a ceramic tube body of the present invention is applied to a support structure for a ceramic tube reducer of a dust removal device.

In the figures, parts that are substantially the same as those of the apparatus shown in FIGS. 4 to 8, which show conventional support structures, are given the same numbers and their explanations will be omitted.

As shown in FIG. 1, the structure of the entire dust removal device is generally similar to the device shown in FIGS. It is provided in a multi-stage manner, and between these tube sheets, air-permeable porous ceramic seed portions 17, 18, and 19 are arranged, respectively, and the various portions 17, 18, and 19 are arranged so that the channels in the tube communicate with each other vertically. It is connected and supported at the through hole in the tube sheet.

Next, to explain the support structure of these seed parts using the seed part 18 as an example, as shown in FIG. is installed.

In this case, the annular member 51 has a cylindrical portion 51a and a flange portion 51.
b, and the cylindrical portion 51a is a filling layer 5 made of a buffer material whose main components are a thermally expandable inorganic material and ceramic fibers.
5 to the outer periphery of the upper end portion of the seed portion 18.

Each of the annular members 51, 52, and 53 is tightened and fixed by bolts 56.

Further, the annular member 52 protrudes toward the inner periphery so as to come into contact with the upper end surface of the reduced cylinder 18, and the annular holder 54 abuts and engages with the upper end surface of the seed portion 18 due to this annular member 52. .

In this case, the surfaces that touch each other are flat, which is preferable to avoid concentration of stress.

In addition, to explain the cushioning material in more detail, it is made by molding thermally expandable inorganic materials such as vermiculite or pearlite and ceramic fibers whose main components are alumina, silica, etc. into a mat shape using a specific binder or the like. is preferable, and the packed layer made of this buffering material expands mainly in the radial direction of the seed portion 18 when heated to, for example, 400° C. or higher, and the outer periphery of the upper end of the reduced cylinder 18 and the cylindrical portion 51a of the annular member 51 expand. It is firmly fixed.

This filling layer also serves to absorb the difference in thermal expansion between the annular member 51 made of metal and the reduced cylinder 18 made of ceramic.

Of course, in the present invention, this filling layer is not limited to the above-mentioned ones, but any material can be used as long as it has cushioning properties, can fix the annular holder, can absorb the difference in thermal expansion, and has heat resistance. Available for use.

The lower edge of a metal bellows 24 is connected to the upper surface of the annular member 53 of the annular holder 54.
This allows displacement in the axial direction (vertical direction), and the upper seed portion 17 and the channel in the tube are connected in airtight communication.

At the lower end of the reduced cylinder 18, an annular member 61, an annular pedestal 62,
An annular holder 64 made of an annular member 63 is attached.

The annular member 61, the annular pedestal 62, and the annular member 63 are tightened and fixed by bolts 65. In addition, the annular member 6
1 has a cylindrical portion 61a and a flange portion 61b, and the flange portion 61b projects toward the inner and outer peripheries so as to form a T-shaped cross section with respect to the cylindrical portion 61a.

A portion of the flange portion 61b that protrudes from the inner periphery is in contact with the lower end surface of the seed portion 18.

The cylindrical portion 61a of the annular member 61 is firmly attached to the outer periphery of the cylinder 18 via a filler [66] made of a cushioning material whose main components are a thermally expandable inorganic material and ceramic fibers as described above.

On the other hand, a tapered seat 15a that is open upward is formed at the periphery of the through hole in the tube plate 15 located below the cylinder 18.

Further, the annular pedestal 62 of the annular holder 64 described above has a circumferential surface having a spherical surface centered on the axis of the cylinder 18, and the receiving seat 15a of the tube plate 15 is located at this spherical portion.
is in contact with.

In this way, the reduced cylinder 18 is supported at its lower end in contact with the tube plate 15 via the annular holder 64.

Since the contact between the annular pedestal 62 of the annular holder 64 and the seat 15a of the tube plate 15 is between a spherical surface and a tapered surface, the sealing performance at that portion is good, and the tube making tube 18 is Good sealing performance and support can be obtained even if the plate 15 is slightly tilted from the vertical position.

The upper edge of the metal bellows 24 is connected to the lower surface of the annular member 63 of the annular holder 64 .

The bellows 24 airtightly connects the lower end of the cylinder 18 and an annular holder attached to the upper end of the cylinder 19 below it.

Similarly, the metal bellows 24 is connected to the annular holder 54 attached to the upper end of the cylinder 18 mentioned above.
It is connected to the annular member 63 of the annular holder 64 of the upper cylinder 17.

In this way, each cylinder 17, 18, 19 has a bellows 24.
The pipes are airtightly connected to each other so that their internal channels communicate with each other, and are designed to absorb displacement due to differences in thermal expansion in the axial direction.

Note that the upper edge of the bellows 24 attached to the upper end of the cylinder 17 is attached to a flange-shaped support plate 2 fixed to the tube plate 13.
6.

The dust collection operation in this dust removal device is the same as that in the device shown in Figs. 4 to 8 described above, so the explanation thereof will be omitted.
During a backwash operation, as described above, a situation may occur in which the cylinder located above the compartment being backwashed momentarily floats up under the pressure of the backwash gas.

As a result, the bellows 24 attached to the upper end of the cylinder above the section to be backwashed is instantaneously compressed, and at the same time, a strong force in the axial direction is applied to the annular holder 54.

However, in the support structure of the furnace cylinder in this dust removal device, the annular member 52 of the annular holder 54 contacts and engages the upper end surface of the cylinder, so most of this force is compressed against the upper end surface of the cylinder. Acts as stress.

For this reason, the shear stress acting on the filling layer provided between the cylindrical portion 61a of the annular member 51 and the cylinder is extremely weak, and it is possible to prevent the filling layer 55 from being destroyed by the shear stress.

In addition, even if the upper end of the reducing tube hits the upper tube plate, etc., the upper end surface of the making tube is protected by the annular holder 54 that abuts and engages with the reducing tube. Damage to the upper end portion and its connecting portion can be prevented.

The same can be said of the annular holder 64 attached to the lower end of the cylinder.

That is, since the backwash gas is normally blown in as a pulsed flow, depending on the pressure of the backwash gas, the reduced cylinder momentarily floats up and then falls.

An annular holder 64 that holds the lower end of the cylinder when it falls.
The annular pedestal 62 collides with the tube sheet below and receives a large impact.

Therefore, a strong axial impact force acts on the annular holder 64, but in the device of this embodiment, the flange portion 61b of the annular member 61 of the annular holder 64 abuts against the lower end surface of the cylinder 18. Since they are engaged with each other, the cylindrical portion 61a of the annular member 61
The shear force applied to the filling layer 66 provided between the furnace tube 18 and the flange portion 61b is received as a pressing force between the lower end surface of the furnace tube 18 and the flange portion 61b, and hardly acts as a shear stress, and the filling layer N6
6 damage can be prevented.

Furthermore, damage to the lower end of the cylinder 18 due to the impact force caused by the collision is also prevented.

FIG. 3 shows an embodiment of another structure of the annular holder attached to the upper end of the cylinder.

In this embodiment, for example, an annular member 7 is attached to the upper end of the reduced cylinder 18.
An annular retainer 73 made of 1.72 mm is attached.

The annular members 71 and 72 are tightened and fixed by bolts 74. The annular member 71 includes a cylindrical portion 71a and a flange portion 71b, and the flange portion 71b projects toward the inner and outer peripheries so as to form a T-shaped cross section with respect to the cylindrical portion 71a.

A portion of the flange portion 71b protruding from the inner periphery contacts and engages with the upper end surface of the cylinder 18.

Further, the cylindrical portion 71a is firmly attached to the outer periphery of the cylinder 18 via a filling layer 75 made of a buffer material mainly composed of a thermally expandable inorganic material and ceramic fibers as described above.

Also in this embodiment, the flange portion 71 of the annular member 71
By abutting and engaging the upper end surface of the cylinder 18, the same effect as in the previous embodiment can be obtained.

The structure of the annular holder according to the present invention takes advantage of the property of ceramics, which is a brittle material, being relatively strong against compressive stress.

Although the dust removal device shown in the above embodiment is an example in which the reduced tubes are connected vertically in multiple stages, the present invention is capable of connecting the upper and lower parts of one section without connecting the ceramic tubes vertically. It can also be applied when a plurality of tubes are arranged in parallel between the tube sheets inside the can body.

In other words, even when the ceramic tubes are arranged in parallel inside the can without being connected in the vertical direction, in order to absorb the difference in thermal expansion in the axial direction between the ceramic tube and the metal can, It is necessary to support it so that axial displacement is allowed.

Furthermore, since it is unavoidable that impact is applied to the end of the ceramic tube during installation or removal work, by applying the support structure of the present invention, the end of the ceramic tube and its This has the effect of preventing damage to the connection portion.

In addition, when engaging the annular retainer with the end surface of the cylinder,
A packing or the like may be interposed between the annular holder and the end face of the cylinder without the annular holder directly contacting the end face of the cylinder.

The ceramic tube support structure of the present invention can also be preferably used in a dust removal device that has a structure in which dust-containing gas is introduced to the outside of the ceramic seed making section and clean gas is extracted from the inside of the ceramic seed making section. In this case, for example, communication holes are provided in areas other than those that engage with the single ceramic tube, except for the topmost tube plate, and the dust-containing gas flows through these communication holes, and the single ceramic tube The collected dust will fall into the hopper below. Further, the lowest end of one ceramic tube is usually closed.

Furthermore, in the example of FIG. 2, the bellows 24 having the annular member 63 and the annular member 53 at the upper and lower ends is arranged between the annular pedestal 62 and the annular member 52, but instead of this,
The bellows may be attached to the lower side of the tube plate, that is, the upper side of the tube plate. In this case, the bellows 24 has an annular member 63 between the annular member 61 and the annular pedestal 62 and an annular member 53 at the upper and lower ends. and the annular member 52 connects to the annular pedestal 62.
connected directly to.

9 and 10 show an embodiment of a support structure for a ceramic tube body in another gas system according to the present invention.

In the following description, substantially the same effects of the present invention can be obtained even if the annular holder is an annular body that does not come into contact with the end surface of the ceramic tube.

In this embodiment, the annular holder attached to the lower end of the ceramic tube is supported in contact with the corresponding tube plate, and is engaged so as to be locked to the tube plate.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is applied to a dust removal device will be described below with reference to the drawings.

A reduced cylinder 151 made of breathable porous ceramics is attached to the can body 1 via an annular holder 152 attached to its lower end.
It is abutted and supported by a tube plate 153 disposed within the tube plate 11 . The annular holder 152 includes an annular member 154° 155, an annular pedestal 1
56, and an annular member 157.

The annular member 154 includes a cylindrical portion 154a and a flange portion 154b.
The cylindrical portion 154a has a reduced cylindrical portion 15 via a filling layer 159 made of a buffering material mainly composed of a thermally expandable inorganic substance and ceramic fibers on the outer periphery of the upper end of the cylindrical portion 151.
It is installed on 1.

Further, the flange portion 154b protrudes from the outer circumference and the inner circumference, and the portion protruding from the inner circumference abuts and engages with the lower end surface of the cylinder 151.

In the illustrated example, the annular member 155 has tongue pieces 155a protruding from four locations on the outer periphery.

Further, as a preferable example, the annular pedestal 156 has a circumferential surface 156a having a spherical surface centered on the axis 2 of the cylinder 151.

Furthermore, a seat 160 having the same spherical surface as the above-mentioned spherical surface is formed on the tube plate 153, and a peripheral surface 156a of the annular pedestal 156 is abutted and supported by this seat 160.

Since the circumferential surface 156a of the annular pedestal 156 is a spherical surface centered on the axis C of the cylinder 151, there may be dimensional errors in the tube plate, the cylinder, the cylinder support, etc., and the reduced cylinder 151 may Even if it is slightly inclined from the vertical position with respect to the tube plate 153,
The peripheral surface 156a of the annular pedestal 156 and the seat 160 of the tube plate 53
It has good sealing properties and can firmly support one cylinder 151.

However, the circumferential surface 156a of the annular pedestal 156 does not necessarily have to be a spherical surface as described above (or may be a corner depending on the surface shape of the seat to be combined).
Furthermore, it may be provided with an R.

Further, the seat 160 does not necessarily have to have a tapered shape, and may have a spherical surface or a corner portion depending on the shape of the peripheral surface of the pedestal to be combined.

Furthermore, a bellows 12 is provided on the lower surface of the annular member 157.
The upper edges of 4 are connected. The lower edge of this bellows 124 is connected to an annular holder attached to the upper end of the lower cylinder.

The tube plate 1 corresponds to the tongue piece 155a of the annular member 155.
At the periphery of the through hole 53, there is a retaining member 1 as well as a catch seat 160.
61 is formed. This restraining member 161 has a first
As shown in the figure, a notch 161a into which the tongue piece 155a is inserted when viewed from above is formed, and the annular holder 152
When lowering the tube onto the tube plate 153, the tongue piece 155a is inserted through this notch 161a. The restraining member 161 is integrally formed with the tube plate 153 so as to have a U-shaped longitudinal section, and when the annular holder 152 is brought into contact with the tube plate 153 and rotates together with the ceramic tube body, The tongue piece 155a is inserted into the U-shaped holding groove 161b.

In this example, there are four tongue pieces, and the rotation angle is approximately 45 degrees.
Although it is set to ``'', it is possible to increase or decrease the number of tongues to 17.
The rotation setting angle can also be changed accordingly.

Therefore, according to this ceramic tube support structure, one tube 151 is inserted into the can through the through hole in the tube sheet above the can body 111, and the annular holder 15 is attached to the lower end of the can.
2 is brought into contact with the tube plate 153.

At this time, the tongue piece 155a of the annular member 155 can be inserted downward through the notch 161a of the restraining member 161.

In this way, the peripheral surface 1 of the annular pedestal 156 of the annular holder 152
By bringing 56a into contact with the seat 160 of the tube plate 153, the lower end of the tube 151 is supported.

In this case, even if the tube 151 is installed slightly tilted from the vertical position with respect to the tube plate 153, the circumferential surface 15 of the annular pedestal 156
Since 6a is a spherical surface centered on the axis β of the cylinder 151, the circumferential surface 156a tightly contacts the seat 160, providing good sealing performance and a reliable support structure.

After the annular holder 152 is abutted and supported on the tube plate 153 in this way, the one tube 151 is rotated.
At the same time, the annular holder 152 rotates, and the tongue piece 155a of the annular member 155 engages the U-shaped holding groove 161 of the holding member +61.
b, resulting in the state shown in FIGS. 9 and 10.

For this reason, for example, due to the pressure difference of the backwash gas, the cylinder reduction 15
1 tries to float up, the tongue piece 15 of the annular member 155
Since the upper surface of 5a engages with the restraining member 161, lifting of the reduced cylinder 151 is restricted. In this way, one cylinder 15
This prevents the tube from rising in the axial direction (vertical direction) and falling as a result, and prevents the filling layer 159 provided between the end of the tube 151 and the annular holder 152 from being damaged.

Note that when the tongue piece 155a is inserted into the U-shaped holding groove 161b of the holding member 161, the holding member 161 is inserted into the tongue piece 155.
It is not essential that the holding member 16 be in close contact with the upper surface of a.
1 may cover the upper part of the tongue piece 155a with some gap.

In this case, if the gap is set within 1.5 mm, one cylinder
Even if 1 floats within this range, the moving speed of 1 cylinder is kept sufficiently low, no large force is applied to each part, and the object of the present invention can almost be achieved.

FIGS. 11 and 12 show another embodiment of the support structure for a ceramic tube body according to the present invention.

Components that are substantially the same as those in the embodiment shown in FIG. 9 and FIG.

Also in this embodiment, an annular holder 162 is attached to the lower end of the reduced cylinder 151.

The annular retainer 162 includes three annular members 163, 164.
165, which are connected together with bolts 166 and 167.

The upper annular member 163 has a cylindrical portion 163a and a flange portion 1.
63b.

The cylindrical portion 163a holds the outer periphery of the upper end portion of the reduced cylinder 151 via a filling M159 similar to that described above.

The flange portion 163b is provided to protrude from the inner and outer peripheries of the cylindrical portion 163a, and the portion protruding toward the inner periphery abuts the lower end surface of the first cylinder 151 and engages with the first cylinder 151.

The annular member 164 in the intermediate portion has tongue pieces 164a projecting at four locations on the outer circumference, and the circumferential surface of these tongue pieces 164a is one
It is formed into a spherical surface having its center on the axis β of the cylinder 151.

Further, a bellows 12 is provided on the lower surface of the lower annular member 165.
The upper edges of 4 are connected.

The lower edge of the bellows 124 is connected to an annular holder attached to the upper end of a manufacturing part (not shown) located below.

A holding member 168 is attached to the periphery of the through hole of the tube plate 153 with bolts 169 so as to support the annular holder 162 .

As shown in FIG. 11, the holding member 168 has a notch 1 corresponding to the tongue piece 164a of the annular member 164 when viewed from above.
68a.

Therefore, the tongue piece 164a can be inserted from above through the notch 168a.

Further, a spherical concave holding groove 168b is formed on the inner circumferential surface of the holding member 168 other than the notch 168a, with which the circumferential surface of the tongue piece 164a of the annular member 164 engages.

In the tube manufacturing support structure according to this embodiment, one tube 151 is lowered from above the can body 111, and its lower end is attached to the tube plate 15.
Insert it into the holding/1llllHb provided at the periphery of the through hole No.3.

At this time, the tongue piece 164a of the annular member 164 can be inserted through the notch 168a of the holding member 168.

In this state, the annular holder 162 is rotated together with the reduced cylinder 151, and the circumferential surface of the tongue piece 164a of the annular member 164 is inserted into the holding groove 168b of the holding member 168.

The circumferential surface of the tongue piece 164a has a spherical surface centered on the axis 2 of the cylinder 151, and the circumferential surface of the tongue piece 164a has a spherical surface centered on the axis 2 of the cylinder 151, and the circumferential surface of the tongue piece 164a has a spherical surface centered on the axis 2 of the cylinder 151.
b is a spherical concave surface that fits the circumferential surface of the tongue piece 164a, so that the circumferential surface of the tongue piece 164a and the inner circumference of the holding groove 168b tightly fit to support the lower end of the cylinder 151. I can do it.

Even if the tube 151 is slightly inclined from the vertical position with respect to the tube plate 153, the peripheral surface of the tongue piece 164a and the holding 1168b
The inner periphery of the cylinder 151 is lowered to support the reduced cylinder 151, and the movement of one cylinder 151 in the axial direction (vertical direction) is restrained, and the same effect as in the embodiment described above can be obtained.

FIG. 13 shows still another embodiment of the support structure for a ceramic tube according to the present invention.

The support structure of this ceramic tube is similar to the embodiment shown in FIGS. 11 and 12, and the annular member 164
The shape of the peripheral surface of the tongue piece 164a and the shape of the holding groove 168b of the holding member 16g are different.

That is, the tongue piece 164a of the annular member 164 is formed to have a triangular cross-sectional shape in the vertical direction, and the holding groove 168b of the holding member 168 has a vertical cross-sectional shape so that the tongue piece 164a fits therein. is formed in a 7-shape.

When rotating the annular holder 162, the tongue piece 164a
The peripheral surface of the annular retainer 162 is inserted into the retaining groove 168b.
The lower end portion of the ceramic tube 151 is supported so as to restrict the movement of the ceramic tube X in the axial direction (vertical direction).

In this way, various shapes can be adopted as the shape of the engaging portion between the peripheral surface of the tongue piece 164a and the holding groove 168b of the holding member 168. In addition, for example, a combination of a convex shape and a concave shape can be adopted. The relationship may be reversed.

In addition, in each of the above embodiments, the ceramic tube body 15
In this example, a locking means is provided on the annular holder 152 and 162 attached to the lower end of the ceramic tube body, but as another example of the support structure of the present invention, an annular holder attached to the upper end of the ceramic tube Locking means may also be provided.

In that case, the annular holder attached to the upper end of the ceramic tube is brought into contact with the upper tube sheet and rotated to provide support between the upper tube sheet and the upper annular holder. A locking means similar to that of each of the above embodiments may be provided.

"Effects of the Invention" As explained above, according to the present invention, since the annular holder that holds the end of the ceramic tube is engaged with the end surface of the ceramic tube, the pressure of the backwash gas is When the ceramic tube suddenly moves in the axial direction due to such reasons, the force applied in the axial direction of the ceramic tube is received as a pressing force between the annular holder and the end surface of the cylinder, and the outer periphery of the end of the ceramic tube Shear stress on the connection portion provided between the annular holder and the annular holder can be reduced.

This can prevent damage to the filling container, which is the connecting portion provided between the outer periphery of the end of the ceramic tube and the annular holder.

In addition, even if the end of the ceramic tube collides with a tube plate, etc.,
Since the end of the ceramic tube is similarly protected by the annular holder, damage to the ceramic tube can be prevented.

According to another example of the present invention, a support structure for a ceramic tube in a gas system in which an annular holder attached to an end of the ceramic tube is supported in contact with the periphery of a through hole in a tube sheet, By rotating the annular holder, we have provided an engagement means that is locked to the tube plate and restricts the axial movement of the ceramic tube body, so for example, in a dust removal device, the differential pressure when backwashing gas etc. is introduced is provided. By this, lifting of the ceramic reduced cylinder can be controlled, and problems such as destruction of the ends, connections, and parts of the ceramic seed part can be avoided.

In the can of a gas system that handles pressurized gas, pressure differences between compartments partitioned by tube sheets often occur in areas other than dust removal devices.

For example, there are cases where gas inside the can is extracted from piping attached to one of the compartments, and gas is introduced into the can, and the support structure that fixes the ceramic tube inside the can requires such operations. It is a useful support structure for gas systems.

In addition, since an engaging means is provided that is locked to the tube plate by rotating the annular holder together with the ceramic tube body,
There is no need to go inside the can to fix it, and the ceramic tube can be installed or removed from the can through the through hole in the tube sheet provided at the top of the can. This has the effect of making it easier.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view showing an example of a dust removal device to which the ceramic tube support structure of the present invention is applied, FIG. 2 is a partial enlarged vertical cross-sectional view showing main parts of the support structure, and FIG. FIG. 4 is a partial longitudinal sectional view showing another embodiment of the support structure for a ceramic tube body according to the present invention, FIG. FIG. 6 is a partial sectional view showing the support structure for the upper end of the ceramic seed making part in the dust removal device; FIG.
The figure is a cross-sectional view schematically showing the entire support structure of the ceramic seed making section in the same dust removal device, and Figure 8 is the support structure for the upper end of the ceramic seed making section in the conventional dust removal device using a ceramic seed making section. FIG. 7 is a partial cross-sectional view showing another example. FIG. 9 and FIG. 1O are a plan view and a partial cross-sectional view thereof showing an embodiment in which another ceramic tube support structure of the present invention is applied to an employment removal device incorporating a ceramic seed making section, and FIG.
．． FIG. 12 is a plan view and a partial longitudinal cross-sectional view showing another example of the support structure for a ceramic tube according to the present invention, and FIG. 13 is a partial longitudinal cross-sectional view showing another example of the support structure for a ceramic tube according to the present invention. be. In the figure, 11 is a can body, 17, 18, 19 is a ceramic tube reducer, 13, 14, 15, 16 is a tube plate, 24 is a metal bellows, 51, 52, 53 is an annular member, and 54 is an annular holder. , 55 is a filling layer, 61.63 is an annular member, 62 is an annular pedestal, 64 is an annular holder, 66 is a filling layer, 71.72 is an annular member, 73 is an annular holder, and 75 is a filling layer. In the figure, 111 is a can body, 124 is a bellows, 151 is a ceramic tube body, 152 is an annular holder, 153 is a tube plate, 15
4. 155 is an annular member, 155a is a tongue piece, 156 is an annular pedestal, 157 is an annular member, 159 is a filling layer, 161 is a restraining member, 161a is a notch, 162 is an annular holder, 1
63, 164, and 165 are annular members, 164a is a tongue piece, 168 is a holding member, and 168b is a holding groove. Figure 1 1b Figure 5 Figure 6 1! Figure 'M 7 Figure 7 Illustration ll Figure 12 Closed

Claims (8)

[Claims] (1) A plurality of tube sheets are provided approximately horizontally in the can body, and the ceramic tube is arranged between the two adjacent tube sheets, upper and lower, so that the through hole provided in the tube sheet communicates with the internal flow path of the ceramic tube. A supporting structure for a ceramic tube body in a gas system in which the axis of the ceramic tube body is supported substantially vertically, the ceramic tube body being in contact with the lower end surface of the tube body through a filling layer on the outer periphery of the lower end of the tube body. A support structure for a ceramic tube body in a gas system, characterized in that the annular holder is engaged with a metal annular holder, and the annular holder abuts and is supported by a lower tube plate. (2) In claim 1, a metal annular holder is engaged with the outer peripheral portion of the upper end of the tube through a filling layer and in contact with the upper end surface of the tube, and the annular holder is A support structure for a ceramic tube in a gas system which is substantially displaceably supported on an upper tube sheet. (3) A plurality of tube sheets are installed approximately horizontally in the can body, and the ceramic tubes are arranged so that the through holes provided in each tube sheet and the flow path inside the ceramic tube communicate with each other between the upper and lower two adjacent tube sheets. In a support structure for a ceramic tube body in a gas system in which a body is supported substantially perpendicularly to its axis, a metal annular body is engaged with the outer periphery of the lower end of the tube body through a filling layer, and the annular body abutting against and supported by the periphery of the through hole of the lower tube sheet, and providing an engagement means that is locked to the tube sheet by rotating the annular body together with the ceramic tube, the lower end of the ceramic tube. A support structure for ceramic tubes in gas systems that restricts the movement of. (4) In any one of claims 1 to 3, the filling layer provided between the lower end outer circumference of the tube and the metal annular body mainly contains a thermally expandable inorganic material and ceramic fiber. A support structure for ceramic tubes in gas systems that consists of a cushioning material. (5) The gas system according to claim 3, wherein the annular holder is configured such that the annular body engaged with the outer peripheral portion of the lower end of the tubular body is in contact with and engaged with the end surface of the ceramic tubular body. Support structure for ceramic tubes. (6) In claim 3 or 5, the engaging means that is engaged with the tube sheet includes tongue pieces protruding from a plurality of locations on the outer periphery of the annular body or the annular holder, and a tongue piece that extends through the tube sheet. The presser member includes a presser member formed on the periphery of the hole, and the presser member has a notch into which the tongue piece is inserted when viewed from above, and the annular body or the annular holder is placed on the periphery of the through-hole of the tube plate. A support structure for a ceramic tube body in a gas system, comprising an engagement means that is locked to a tube plate in such a way that the tongue piece is pressed under the presser member when the ceramic tube body is rotated in contact with the presser member. (7) A support structure for a ceramic tube in a gas system according to any one of claims 1 to 6, wherein the ceramic tube is an air-permeable porous filter tube, and the gas system is a dust removal device. (8) A support structure for a ceramic tube body in a gas system according to claim 7, wherein the dust removal device performs regeneration by backwashing operation.