JPH0534740Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-temperature gas dust collector for effectively collecting and removing various types of dust contained in high-temperature gas.

[Conventional technology]

Conventionally, as a dust collector for high-temperature gas, the interior of a sealed furnace, which has a gas inlet and a gas outlet at the top and bottom, is divided into two by a partition wall having a large number of through holes between the inlet and the exhaust port. A cylindrical porous ceramic filter is made of stainless steel or the like with the upper end of the filter in pressure contact with the lower surface of the partition wall in the through hole portion, and the lower end of the filter is locked with the lower end of a support rod inserted into the filter. The filter is suspended from the lower surface of the partition wall by locking the upper end of the support rod onto the partition wall. In such a dust collector, when the high-temperature dust-containing gas introduced into the furnace from the gas inlet passes through the ceramic filter, the dust is captured and removed on the surface of the filter, and the dust-containing gas passes through the inside of the filter cylinder. It is discharged from the gas exhaust port as clean gas. However, during dust collection operations at high temperatures, due to the difference in thermal expansion between the ceramic filter and the stainless steel support rod that suspends it from the bulkhead, the filter must be supported in pressure contact with the lower surface of the bulkhead. The elongation of the supporting rods is much greater than the elongation of the filter, and a gap is created between the upper end of the filter and the lower surface of the partition wall, causing the problem that dust-containing gas leaks from this gap. Therefore, as a dust collector with a structure that does not create a gap between the partition wall and the upper end of the filter, for example,
- Like the dust collector described in Publication No. 11935, a packing material that slides in the axial direction is interposed between the inner circumferential surface of the filter and the outer circumferential surface of the support rod to absorb shrinkage due to heat by sliding. Or Tokukaisho
As described in Japanese Patent No. 61-4728, etc., a filter is known in which a compression spring is used to elastically pull up a support rod to keep the filter always in pressure contact with the lower surface of the partition wall. In such dust collectors, during the dust collection operation, the dust contained in the gas adheres to and accumulates on the surface of the filter, and as the dust collection time passes, the permeability of the gas passing through the filter deteriorates. Therefore, it is necessary to brush off the dust that has adhered or accumulated on the filter surface. As a method for removing dust, a pulse jet method is particularly advantageous. This is a dust collector that collects dust by passing the gas to be treated from the outside of the cylindrical filter toward the inside of the cylinder, and by blowing compressed air from above the cylindrical filter into the filter cylinder in a very short period of time. The ejected air sucks in 5 to 7 times as much secondary air from the surrounding area, rushes into the cylinder, and blows off the dust that has adhered to and accumulated on the filter surface by the air that flows back toward the outside and outside of the cylinder. The dust collector has a strong dust removal action and can be dusted off during the dust collection operation.Since the filtration speed is high, the filtration area is small and the dust collector can be made smaller. It is a harpoon that has many advantages such as: However, in the dust collectors described in Japanese Patent Publication No. 56-11935 or Japanese Patent Application Laid-open No. 61-4728, the mounting portion of the support rod that supports the filter is located above the through hole in the partition wall that communicates with the upper end opening of the filter. Because the compression spring is attached and the space above the through hole is closed, the structure makes it impossible to install the compressed air injection nozzle inside the filter cylinder.
This brushing off method using pulse jet cannot be adopted. In contrast, for example, in the dust collector described in Japanese Patent Application Laid-Open No. 61-4729, a compression spring is attached to the lower end of the support rod that supports the filter so that the upper end of the filter is always pressed against the lower surface of the partition wall. A dust collector has been devised in which a compressed air injection nozzle can be installed by opening the upper end of the filter and above the partition wall passage hole, but when a compression spring is attached to the lower end of the filter located on the lower surface of the partition wall in this way, Compared to the upper side of the partition wall, the compression spring is more susceptible to the heat of the high-temperature gas, and the compression spring is severely degraded by the heat, resulting in poor durability. In addition, in the dust collector described in Japanese Patent Publication No. 60-9843, an annular enlarged portion provided on the outer periphery of the open end of a bottomed cylindrical ceramic filter is inserted into a through hole while abutting against a partition wall. This makes it possible to maintain confidentiality between the filter and the bulkhead without using a compression spring, and the upper part of the through hole is open, and a compressed air injection nozzle is attached to the upper part of the through hole to blow it away with a jet pulse. Some have made it possible. However, ceramic filters are inherently high in cost, and creating a complex-shaped filter with a bottom and enlarged portion at the open end using ceramics would be very costly, which would pose a practical problem. .

[The problem that the idea attempts to solve]

In view of the above-mentioned problems, the present invention is a high-temperature gas dust collector using a ceramic filter. By using a ceramic filter in a shape that can be easily mass-produced by extrusion molding, the cost of the device can be reduced and the furnace can be used. In addition to being able to be mounted securely between the filter and the internal partition wall, the dust that adheres to and accumulates on the filter surface as time passes during dust collection can be removed using the pulse jet method, allowing for efficient dust collection. The present invention aims to provide a high-temperature gas dust collector that can perform the following functions.

[Means to solve the problem]

In order to solve the above problem, the high-temperature gas dust collector according to the present invention has a gas inlet at the bottom and a gas outlet at the top. A filter support plate provided with a through hole is used to divide the gas inlet chamber and the gas exhaust chamber into a gas inlet chamber and a gas exhaust chamber, and a bell mouth is attached to the gas exhaust chamber side of each through hole of the filter support plate, and a bell mouth is attached to the gas inlet chamber side of the through hole. In this method, a cylindrical ceramic filter with vertical openings is inserted into the filter, and the lower end of a support rod is inserted through a gasket through a bottom cover that covers the lower opening of the filter, and the lower end of the support rod is screwed to the lower end of the support rod. The lower surface of the bottom plate is supported by a nut, and the upper end of the support rod is fitted onto the bell mouth on the filter support plate, and is secured to the upper part of a compression spring provided by a hanger member that passes through the bell mouth and the through hole. As a result, the lower end openings of a large number of cylindrical ceramic filters are sealed, and the upper ends are pressed against the lower surface of the filter support plate, so that the upper end openings communicate with the through holes of the filter support plate and the bell mouth, and are connected to the gas discharge chamber side. A compressed air injection nozzle is suspended in the gas introduction chamber on the lower surface of the filter support plate in an open state, and above the upper end opening of the ceramic filter is provided a compressed air injection nozzle that opens toward the inside of the cylinder of the filter and is connected to the compressed air supply means. It is characterized by being arranged.

[Effect]

The high-temperature gas dust collector according to the present invention has the above-described configuration, and the high-temperature dust-containing gas introduced into the gas introduction chamber from the gas introduction port by pressure feeding or suction is suspended from the lower surface of the filter support plate of the gas introduction chamber. permeates from the outside of the cylindrical ceramic filter into the inside of the cylinder,
During this permeation, the dust contained in the gas is captured and removed by the ceramic filter, and the clean gas passes through the filter cylinder, enters the gas discharge chamber through the upper end opening and the through hole in the filter support plate, and is discharged from the gas discharge port. . The dust that has adhered to and accumulated on the outer surface of the filter can be removed by instantaneously injecting compressed air from a compressed air injection nozzle toward the inside of the filter cylinder, and the injected air sucks in 5 to 7 times as much secondary air from the surrounding area. It enters the filter cylinder through the bell mouth, passes through the filter toward the outside surface of the filter, and flows back, thereby blowing off the dust that has adhered and accumulated on the outside surface of the filter and restoring the gas permeability of the filter. The dust collection operation continues again.

〔Example〕

The present invention will be explained in more detail below based on the embodiments shown in the accompanying drawings.

The high temperature gas dust collector 1 according to the present invention includes, for example, a first
As shown in the figure, a gas inlet 5 is provided on the lower wall of the sealed furnace 2, and a gas outlet 6 is provided on the upper wall.
A filter support plate 7 with a large number of holes provided between the filter support plate 7 and
The interior of the furnace 2 is divided into a gas introduction chamber 3 and a gas discharge chamber 4. The lower part of the gas introduction chamber 3 is a hopper 8, and a dust discharge pipe 9 and a dust box 10 are connected therebelow. A bell mouth 12 is attached to the gas discharge chamber 4 side of the through hole 11 of the filter support plate 7, and a bell mouth 12 is attached to the gas introduction chamber 3 of the through hole 11.
A cylindrical filter 13 made of porous ceramics is suspended between the filter support plate 7 and the bell mouth 12, and a solenoid valve is installed above the bell mouth 12 in the gas discharge chamber 4. A compressed air injection nozzle 15 is provided which is associated via 14 with compressed air supply means (not shown). The structure of the mounting part of the ceramic filter 13 is shown in Figure 2.
As shown in FIG. 3, the lower end opening of the cylindrical ceramic filter 13 is covered with a bottom cover 17 via a gasket 16, and the filter 13 is
The lower end of the support rod 18 inserted into the cylinder is passed through the bottom cover 17 and a nut 19 is screwed on to lock it to the lower surface of the bottom plate 17, and the upper end of the support rod 18 is attached to the bell mouth 12 above the filter support plate 7. By connecting the upper end of the compression spring 20 fitted externally with hangers 21, 21 to the mounting shaft 22 which penetrates the upper end of the support rod 18, and elastically pulling the support rod 18 upward with the compression spring 20. , the filter 13 is suspended in the gas discharge chamber 3 with the upper end of the filter 13 always in pressure contact with the lower surface of the filter support plate 7. Furthermore, in the illustrated embodiment, the upper end of the filter 13 and the filter support plate 7 are In order to more reliably maintain confidentiality, an annular fitting groove 23 is provided around the through hole 11 on the lower surface of the filter support plate 7, and the upper end of the filter 13 is inserted into the annular fitting groove 23 via a gasket 24. It is made by fitting the parts.

The cylindrical ceramic filter 13 is made of porous ceramics such as alumina, silicon carbide, or cordierite, and has a cylindrical shape with the same diameter in the axial direction and openings at the top and bottom, and can be mass-produced by extrusion molding. Yes, it can be produced at low cost. In addition, the high-temperature gas to be treated is exposed to the support rod 18 for suspending the filter 13 from the lower surface of the support plate 7, the nut 19, the bottom plate 17, the annular fitting groove 23, the lower surface of the filter support plate 7, etc. It is preferable that each member on the side of the gas introduction chamber that comes into contact be made of, for example, stainless steel, and that its surface is colorized with aluminum to prevent surface oxidation due to high-temperature gas and has excellent durability. . The gaskets 16 and 24 are made of ceramic fiber felt, and the compression spring 20
It is preferable to use a material made of highly heat-resistant Inconel or zirconia to create a structure that can withstand high-temperature gas processing operations.

Dust collection of high temperature gas by the high temperature gas dust collector 1 as described above is performed at a high temperature (for example, 600 to 800
°C) through the gas inlet 5 installed at the bottom of the furnace 2.
When introduced into the gas introduction chamber 3 in the furnace 2 by pressure-feeding or suction, the high-temperature gas containing dust is
Dust and the like contained in the gas are removed from the surface of a large number of ceramic filters 13 suspended below the filter support plate 7 through the pores of the ceramics, and the clean high-temperature gas is passed through the ceramic filters. 13 enters the gas discharge chamber 4 from inside the cylinder through the through hole 11 of the filter support plate 7 and the bell mouth 12, and enters the gas discharge port 6.
is discharged from.

When dust, etc. adheres to and accumulates on the surface of the ceramic filter 13 due to long-term dust collection operations, and the gas permeability of the ceramic filter 13 decreases, the solenoid valve 14 is activated to supply compressed air to the compressed air injection nozzle 15 from the compressed air supply means. When compressed air is supplied from the nozzle 15 and is instantaneously injected into the cylinder of the filter 13, the injected air sucks in 5 to 7 times as much secondary air from the surroundings and passes through the bell mouth 12. It rushes into the cylinder of the filter 13 and flows back toward the outer surface of the filter 13, passing through the pores of the ceramic. Then, the dust that has adhered to and accumulated on the outer surface of the filter 13 is blown away from the outer surface of the ceramic filter 13 by compressed air and is swept downward, and is accumulated in the dust box 10 through the dust discharge pipe 9 from the hopper 8 at the bottom of the furnace 2. It is. In this way, the dust that has adhered and accumulated on the surface of the ceramic filter 13 is removed by instantaneous compressed air backwashing, that is, jet pulse, and the gas permeability of the filter 13 is restored, allowing efficient dust collection to continue again. It is.

The dust is removed by the jet pulse in parallel with the dust collection operation by sequentially removing the dust from an appropriate number of filters at different times while continuing to collect the high-temperature gas into the furnace 2. This allows the dust on the surface of the filter 13 to be brushed off.

[Effect of idea]

As mentioned above, the high temperature gas dust collector according to the present invention has the following features:
As a ceramic filter that can process high-temperature gases, we have realized a reduction in equipment costs by using a cylindrical ceramic filter with openings at the top and bottom that can be mass-produced by extrusion molding.In addition, we have achieved a reduction in equipment costs by using a jet pulse to remove dust that adheres to and accumulates on the filter surface. By making dust removal possible and performing efficient dust collection, it is possible to improve dust collection efficiency and downsize the device.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of one embodiment of the high-temperature gas dust collector according to the present invention, Fig. 2 is an enlarged sectional view of the main part showing the structure of the mounting part of the ceramic filter, and Fig. 3 is a plan view of Fig. 2. It is a diagram. 1...dust collector, 2...furnace, 3...gas introduction chamber,
4... Gas discharge chamber, 5... Gas inlet, 6... Gas discharge port, 7... Filter support plate, 8... Hopper, 9... Dust discharge pipe, 10... Dust box, 11... Connection Hole, 12...Bell mouth, 13
... Ceramics filter, 14 ... Solenoid valve,
15... Nozzle, 16... Gasket, 17...
Bottom plate, 18...Support rod, 19...Nut, 20...
...Compression spring, 21... Hanger, 22... Mounting shaft, 23... Annular fitting groove, 24... Gasket.

Claims (1)

[Claims for Utility Model Registration] 1) A sealed furnace with a gas inlet in the lower part and a gas outlet in the upper part is covered with a filter support plate having a large number of holes between the inlet and the outlet. The filter support plate is divided into a gas introduction chamber and a gas discharge chamber, and a bell mouth is attached to the gas discharge chamber side of each through hole of the filter support plate, and a cylindrical shape with vertical opening is attached to the gas introduction chamber side of the through hole. The lower end of the support rod inserted into the ceramic filter passes through the bottom cover that covers the lower end opening of the filter through the gasket, and the lower surface of the bottom plate is supported by a nut screwed onto the lower end of the support rod. A large number of cylindrical ceramic filters can be attached to the top of a compression spring provided by fitting the upper end of the support rod to a bell mouth on the filter support plate with a hanger member passing through the bell mouth and the through hole. The lower end opening is sealed, the upper end is pressed against the lower surface of the filter support plate, and the upper end opening communicates with the through hole of the filter support plate and the bell mouth to open to the gas discharge chamber side. The ceramic filter is suspended in the gas discharge chamber, and above the upper end opening of the ceramic filter is provided a compressed air injection nozzle that opens toward the inside of the cylinder of the filter and is associated with compressed air supply means. High temperature gas dust collector. 2) An annular fitting groove is provided around the through hole on the lower surface of the filter support plate, and the upper end of a cylindrical ceramic filter is fitted and pressure-bonded into the fitting groove via a gasket. High-temperature gas dust collector described in section. 3) A high-temperature gas dust collector according to the patent scope 1 or 2, which uses a ceramic filter made of porous ceramics such as alumina, silicon carbide, or cordierite. 4) Claim 1, which uses stainless steel with a colorized surface as the support rod.
The high-temperature gas dust collector according to item 1 or 2 or 3. 5) A high-temperature gas dust collector according to claim 1 or 2 or 3 or 4, wherein the compression spring is made of in-coil material.