KR101419143B1 - Gate valve - Google Patents

Abstract

The high-temperature furnace content gate valve comprises a granular sealing material capable of flowing in a temperature range of from room temperature to 900 ° C, a valve box in which the sealing material is stored in a bottom portion, And a second flow pipe connected to the valve box for discharging gas from the inside of the valve box to the outside, at least a part of which is buried in the sealing material, And a gas flow path extending from the first flow path tube toward the second flow path tube, wherein the gas flow path is located above the surface of the sealing material, And a valve body which is lifted up to a rising position of the valve body to be introduced.

Description

Gate Valve {GATE VALVE}

The present invention relates to a gate valve used in an apparatus such as a coke oven using various gases (particularly, high-temperature gas).

The present application claims priority based on Japanese Patent Application No. 2009-235040 filed on October 09, 2009, which is incorporated herein by reference.

In steel coke oven, coal gas (Coke Oven Gas, hereinafter referred to as COG) generated at the time of carbonization of coal is recovered from the collecting pipe and used as fuel. At this time, the generated COG is at a high temperature of about 850 DEG C or about 900 DEG C, so that it is possible in principle to recover the sensible heat of the gas to save energy. However, tar contained in the high boiling point gas is contained in the COG, and when the temperature of the COG is lowered to 700 DEG C or less, the tar in the COG is condensed. Once condensed, tar is changed in properties after condensation to a substance that does not readily evaporate even if heated again. COG also has a property that carbon containing hydrocarbon such as methane decomposes at a high temperature of 700 ° C or higher and precipitates as solid carbon (soot) (this phenomenon is called caulking). Since the solid carbon once precipitated is firmly bonded to each other, even if the temperature is lowered again, it does not readily become hydrocarbon.

In the prior art, for example, when COG of high temperature is circulated in a pipeline system (pipeline, valve, blower, etc.), such tar or solid carbon is adhered in a large amount in the pipeline system. This makes it difficult to operate the pipeline system equipment. Therefore, conventionally, when COG generated in the coke oven is discharged from the riser pipe to the coke oven, it is immediately cooled to room temperature. At this time, since tar is condensed and separated from the COG and mixed and removed in the cooling water, only a low boiling point gas (referred to as dry COG) in COG at room temperature has been recovered as fuel. Since dry COG does not have any special operation problems, general industrial pipeline equipment can be applied and the gas flow in the pipeline can be freely controlled.

On the other hand, in the uprising pipe, caustion against the inner surface of the uprising pipe can not be avoided since the tar (untreated COG) from which tar has not been removed must be in contact with the inner surface of the uprising pipe. In addition, the COG temperature may be lowered in the course of a series of coal digestion operations, in which case the condensate of tar contained in the COG may adhere to the walls of the riser to form a rigid fixation layer. If the operation is continued while these deposits are formed, the channel of the riser pipe is closed. For this reason, in the piping of the riser pipe, it is necessary to burn and remove the carbon adhering to the inside of the riser pipe every certain short time, for example, every day. The problem of tar adhesion and caulking occurring in such a riser pipe is not limited to the riser pipe but is a common problem in piping systems for distributing wet COG.

For example, in the method disclosed in Patent Document 1, in which the flow rate adjusting valve is provided between the rising pipe and the dry main, the temperature of the COG flowing through the flow rate adjusting valve is already lowered by spraying the spray. In addition, since the flow control valve can not block the flow of gas, a waterproof valve is separately required. Patent Document 2 discloses a shut-off valve for wet COG. However, in this shut-off valve, the valve seat and the valve body continue to come in contact with the wet COG, and severe caulking or condensation solidification of tar can be avoided There is no need for frequent cleaning work. In Patent Document 3, an air piping is provided in an uprising pipe, and the air circulating in the air pipe is heated by COG flow at a high temperature in the uprising pipe, thereby achieving the arrangement recovery. However, in the case of this apparatus, if the cooling amount of the COG is large, the COG immediately condenses on the surface of the air piping as tar, and solidifies to adhere to the surface of the air piping. As a result, the heat conduction is inhibited and the rising pipe is closed. Further, there is a problem that only a small part of the sensible heat of COG can be recovered. Thus, in the case of using the sensible heat of the high-temperature wet COG, it is considered that it is advantageous to accelerate the useful chemical reaction (gas reforming) of COG which can be performed only under high temperature conditions, rather than the arrangement is recovered.

In the ascending pipe, since it is necessary to open and close the pipe, normally two valves, an ascending pipe top cover and a dry main lid, are provided. The rising pipe top cover is fired while diffusing the residual gas in the coke oven into the atmosphere after the completion of the carburisation and is waterproofed between the rising pipe top cover and the rising pipe when the coal is being carburized. Alternatively, a structure has been previously adopted in which a gap is previously formed between the uprising pipe and the lid to completely prevent the COG from being sealed, in order to prevent the riser pipe top cover from sticking to the riser pipe by deposition of deposits. Further, the dry main lid is a lid for the pipeline connecting the ascending pipe and the dry main, but this is also waterproof when the pipeline is removed. As described above, as the structure of the valve that can contact the wet COG in the prior art, a structure that is kept at a low temperature or is not completely sealed has been used.

Japanese Patent Application Laid-Open No. 2004-107466 Japanese Utility Model Publication No. 62-39077 Japanese Utility Model Application Publication No. 58-7847

Journal of Japan Society of Powder Technology and Technology, Vol.

In order to utilize the sensible COG in the state of the wet COG, it is indispensable to control the flow of the wet COG in the high temperature state in the COG pipeline system to open and close the pipeline. However, in the valve (cover) of the prior art, the tar COG can not be completely sealed, the wet COG is lowered, or the tar or solid carbon adhered to the inner surface of the valve is frequently shut down (coal- There arises a problem such as the necessity of removing it.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a gate valve capable of circulating a gas, particularly a wet COG from room temperature to about 850 ° C or about 900 ° C, for a long period of time do.

The present invention solves the above-mentioned problems and adopts the following means in order to achieve this object.

(1) A gate valve according to one aspect of the present invention includes: a granular sealing material capable of flowing in a temperature range from room temperature to 900 DEG C; a valve box having the sealing material stored in a bottom portion; A second flow pipe connected to the valve box for discharging gas from the inside of the valve box to the outside and a second flow pipe connected to the valve box at least partially Is lowered to a valve body lowering position for inhibiting the flow of gas from the first flow path to the second flow path and is disposed above the surface of the sealing material, A valve body which moves up to a valve body lifting position in which the gas flows toward the second flow path, and a valve body which is located between the valve body lowering position and the valve body lifting position And a valve body lifting and lowering device for lifting and lowering the valve body.

(2) The gate valve according to (1), further comprising a fluidizing gas supply switching mechanism having a fluidizing gas pipe for supplying a fluidizing gas for flowing the sealing material from the outside to the inside of the valve box, The switching mechanism supplies the fluidized gas to the interior of the valve box through the fluidizing gas pipe during a moving period in which the valve body moves between the valve body lowering position and the valve body lifting position, It is preferable that the flow of the fluidizing gas is switched so as not to supply the fluidizing gas to the inside of the valve box.

(3) A gate valve according to one aspect of the present invention includes: a valve box having at least a granular sealing material capable of flowing in a high temperature range from room temperature to 900 DEG C;

The valve box is provided with a high temperature gas outlet pipe connected above the surface of the sealing material and a high temperature gas inflow pipe connected to the valve box so that an opening is disposed above the surface of the sealing material at least in an open state of the valve, Wherein the sealing material is used in the closed state of the pipe and the gate valve to prevent the hot gas from flowing between the hot gas inflow pipe and the hot gas outflow pipe at a position where at least a portion of the valve body is buried in the sealing material A valve body disposed at a valve body lowering position and being located at a valve body lifting position at a position where all the valve bodies exist above the surface of the sealing material in an open state of the gate valve; A valve body lifting / lowering device for changing between a valve body lowering position and a valve body lifting position; A fluidizing gas pipe connected to a lower portion or a lower portion of the sealing material for supplying a fluidizing gas for burning a carbide to the valve box and a fluidizing gas switching mechanism for switching the gas burning the carbide into a feeding state or a stopping state do.

(4) In the gate valve according to (1) or (2), when the valve body is lowered to the valve body lowering position, a space inside the valve body is divided into a first It is preferable to be separated from the space and the second space other than the space.

(5) In the gate valve according to (1) or (2), when the valve body is lowered to the valve body lowering position, the sealing material pushed out by the valve body moves, And a first space including the inside of the first flow path and a second space including the inside of the second flow path.

(6) In the gate valve according to (1) to (5), it is preferable that a pad for suppressing scattering of the sealing material is mounted on the upper surface of the sealing material.

(7) In the gate valve according to (2) to (5), it is preferable that the fluidizing gas is an oxidizing gas containing oxygen.

(8) In the gate valve according to the above (1) to (5), the sealing material may be one or two or more selected from alumina, magnesia, zirconium, stabilized zirconia, titanium oxide, silicon nitride and silicon carbide desirable.

According to the gate valve described in (1) above, a granular sealing material capable of flowing in a temperature range from room temperature to about 850 ° C or as high as about 900 ° C is stored in the bottom of the valve box. When the gate valve is in the open state, the valve body rises to the valve body lifting position, and gas flows between the first flow pipe and the second flow pipe. Further, when the gate valve is in the closed state, the valve body is lowered to the valve body lowering position, and the flow of the gas between the first flow path and the second flow path is impeded. At this time, even if tar or solid carbon is generated in the sealing material, since the sealing material can flow, the sealing material flows, so that tar or solid carbon is dispersed in the sealing material. Therefore, since it is not necessary to remove tar or solid carbon in the valve box, it becomes possible to circulate the gas (particularly, wet COG from room temperature to about 850 deg. C) for a long time in the pipeline.

Further, by using a granular material that does not cause a great change in physical properties such as phase change, thermal decomposition, sintering, or phase transformation even at a high temperature of about 850 DEG C or 900 DEG C as a sealing material for a gate valve, The sealing property of the sealing member is secured. On the other hand, in the case of a sealing method of the prior art, for example, in the case of a waterproof valve, waterproof valves can not be applied because water can not be maintained as a liquid at a high temperature by a phase change. Even in the case of using solid particles as a sealing material, in the case of using particles of a phase change material, for example, in a temperature range of room temperature to 850 캜, particles are gradually broken do. As a result, there is a problem that the particle size distribution of the particles can not be maintained at an optimum constant value, and the particles of the phase change material are not suitable as the sealing material.

Further, in the gate valve, generally, different materials are used in combination among parts of the gate valve in accordance with a required function. When such a gate valve is used in a wide temperature range, a thermal expansion difference occurs between the parts. Thereby, it is difficult to maintain the same state in a wide temperature range in the contact between the parts, for example, in the contact between the valve seat and the valve body. Further, when the valve is used at a high temperature of about 850 DEG C or 900 DEG C, the material can not be deformed by creep in the long term, so it is difficult to maintain the same fitting over a long period of time Do. The gate valve of the prior art has a structure for sealing the working fluid by tightening the valve body to the valve seat. When the fitting of the valve is changed, a gap is formed between the valve body and the valve seat, and the sealing becomes incomplete. On the contrary, the contact force between the valve body and the valve seat becomes excessive, and the valve body can not be moved. On the other hand, in the gate valve of one embodiment of the present invention, sealing is performed by burring the valve element in a layer of a highly movable sealing material (for example, a depth of 30 mm or more and 1 m or less) The above problem can be avoided.

Generally, since the wet COG contacts the sealing material, caulking or tar is condensed and solidified in the sealing material. However, since a relatively large amount of granular sealing material is used, caulking and tar are not condensed and solidified, so that adverse effects on sealability are hardly obtained. That is, in the gate valve of one embodiment of the present invention, since the sealing material is fluidized and stirred, even when caulking is generated in a part of the sealing material in the surface layer, the precipitated carbon is rapidly dispersed in the whole layer. Thereby, the influence of deterioration in sealing property and fluidity of the sealing material can be reduced. Further, in the gate valve of one embodiment of the present invention, since the valve element is frequently buried in the sealing material, the sealing material has the effect of polishing the valve element, so that there is an effect of removing the deposit on the valve element surface.

When a granular sealing material is used, it is not possible to completely block the airflow flowing through the sealing material layer like a liquid seal. However, by forming a layer of a relatively thick (deep) sealing material (for example, a depth of 30 mm or more and 1 m or less) to increase the ventilation resistance, the flow rate is reduced to a negligible level and substantial gas sealing is performed. Therefore, in the case where the valve body is buried in the sealing material such as the gate valve described in the above (1) so as to perform gas sealing with the sealing material layer, the valve body is preferably deeply sealed in the sealing material, for example, It is preferable to bury to a position of 1 m or less.

In general, in order to deeply insert a valve body having a relatively large sectional area into a stationary sealing material layer, a great thrust and a high rigidity of the apparatus are required. As a result, the apparatus becomes enormous, and the contact stress between the sealing material and the valve body also increases, so that there arises a problem that wear of the valve body tends to proceed. On the other hand, in the gate valve described in (1) above, when the valve body is moved in the sealing material, the sealing material in the valve box is fluidized, whereby the resistance when the valve body moves in the sealing material can be greatly reduced. Thereby, the above-described problem can be avoided.

In the case of the gate valve described in (1) above, the valve body elevating device lowers the valve body, and at least a part of the valve body is buried in the sealing material so that the flow of the gas between the first flow path and the second flow path Lt; / RTI > Further, the valve body lifting device lifts the valve body, and gas flows between the first flow path tube and the second flow path tube. By providing the valve body lifting device in this manner, the valve body can be raised and lowered easily and reliably between the valve body lowering position and the valve body lifting position.

In the case of the gate valve according to (2), the fluidized gas is supplied through the fluidized gas pipe in the valve box by the fluidized gas supply switching mechanism in accordance with the movement of the valve body. As described above, by supplying the fluidizing gas into the valve box as required, the sealing material can be efficiently fluidized.

In the case of the gate valve described in (4) above, when the valve body descends to the valve body lowering position, the inside of the valve box includes the first space including the inside of the valve body and the inside of the valve box So that the flow of gas between the first flow path and the second flow path is impeded. Thereby, contamination or corrosion of the valve body or the like can be suppressed by the gas (for example, a gas component such as wet COG).

In the case of the gate valve according to (5), when the valve body is lowered to the valve body lowering position, the space around the valve box is filled with the sealing material pushed out by the valve body, And the second space including the inside of the second flow path, the flow of gas between the first flow path and the second flow path is disturbed. Thereby, contamination or corrosion of the valve body or the like can be suppressed by the gas (for example, a gas component such as wet COG).

1 is a schematic diagram showing a state in which the gate valve of the first embodiment of the present invention is opened.
2 is a schematic diagram showing a state in which the gate valve is closed.
3 is a schematic diagram showing a state in which the gate valve of the second embodiment of the present invention is opened.
4 is a schematic diagram showing a state in which the gate valve is closed.
5 is a schematic diagram showing a state in which the gate valve of the third embodiment of the present invention is opened.
6 is a schematic diagram showing a state in which the gate valve is closed.
7 is a schematic diagram of a state in which a valve is opened in a fifth embodiment of the present invention.
8 is a schematic diagram of a state in which the valve is closed in the fifth embodiment of the present invention.
9 is a schematic diagram of an apparatus structure showing another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description will be omitted.

(First Embodiment)

Fig. 1 shows the opened state of the gate valve 100, and Fig. 2 shows the closed state of the gate valve 100. As shown in Fig. The arrow F shown in Fig. 1 indicates the direction in which the working gas (for example, a gas component such as wet COG) flows.

The gate valve 100 described in this embodiment is a high temperature furnace gas gate valve used in a high temperature furnace. The high temperature furnace gas gate valve 100 is provided with a granular sealing material 5 capable of flowing in a temperature range of from room temperature to 850 캜 at a high temperature or about 900 캜 and a sealing material 5 having a sealing material 5 stored in the bottom portion 1A (First flow pipe) 3 connected to the valve box 1 and to which a high temperature working gas (gas) flows, and a high temperature gas inflow pipe Temperature gas outflow pipe (second flow path pipe) 4 through which the working gas flows out, and a valve body 2 which moves in the vertical direction. Hereinafter, the hot gas inflow pipe 3 may be simply referred to as the "inflow pipe 3", and the hot gas outflow pipe 4 may be simply referred to as the "outflow pipe 4".

The high temperature gas inflow pipe 3 is provided with the opening 3A above the surface 5A of the sealing material 5 at least when the gate valve 100 is opened and the inside 1B of the valve box 1 ) And the outside (1C). The high temperature gas inflow pipe 3 specifically penetrates the sealing material 5 from the bottom portion 1A of the valve box 1 and extends to the inside 1B of the valve box 1. [

The hot gas outflow pipe 4 is provided on the side surface 1D of the valve box 1 above the surface 5A of the sealing material 5 and is connected to the inside 1B of the valve box 1 and the outside 1C ).

At least part of the valve element 2 is buried in the sealing material 5 when the gate valve 100 shown in Fig. 2 is in the closed state and the valve element 2 is located between the inlet pipe 3 and the outlet pipe 4 And falls to the valve body lowering position which inhibits the flow of high temperature working gas. The valve element 2 is disposed above the surface 5A of the sealing material 5 when the gate valve 100 shown in Fig. 1 is in the open state, and the inlet tube 3 and the outlet tube 4) to the valve body ascending position through which the working gas flows. The inside 2A of the valve body 2 is hollow and the inlet pipe 3 is inserted into the inside 2A of the valve body 2 when the gate valve 100 is closed.

(Structure of gate valve)

As shown in Fig. 1, when the gate valve 100 is open, the high temperature working gas flows into the valve box 1 from the hot gas inlet pipe 3 and flows from the hot gas outlet pipe 4 Out. The position of the valve body 2 at this time is referred to as the valve body rising position. The lower end portion 2B of the valve body 1 is closed by the valve element 2 buried in the sealing material 5 when the gate valve 100 is being closed as shown in Fig. The space is defined by the first space (the space including the inside of the valve body 2) 19 on the inlet pipe 3 side and the second space 20 on the outlet pipe 4 side And the flow of hot working gas from the inlet pipe 3 to the outlet pipe 4 is impeded. The position of the valve body 2 at this time is referred to as a valve body lowering position. Here, the first space 19 is formed by the inner wall of the valve body 2, the outer wall of the inlet pipe 3, and the surface 5A of the sealing material 5, The inner wall of the valve body 1, the outer wall of the valve body 2, and the surface 5A of the sealing material 5.

A trace amount of working gas can flow through the gap (inside) of the sealing material 5. However, when the depth of the valve element 2 to the sealing material 5 is sufficient, the sealing resistance of the sealing material 5 is sufficiently large, so that substantial gas sealing can be realized. Even when a differential pressure of 100 Pa is given between the first space 19 on the side of the hot gas inlet pipe 3 and the second space 20 on the side of the hot gas outlet pipe 4, 5) can be set to 1 mm / sec or less. The depth of the valve element 2 to be embedded in the sealing material 5 can be, for example, 30 mm or more and 1 m or less. When the buried depth is smaller than 30 mm, the sealing property of the sealing material 5 is insufficient. When the buried depth is larger than 1 m, the apparatus becomes excessively expensive compared to the sealing ability that can be realized. Therefore, by setting the buried depth to 30 mm or more and 1 m or less, it is possible to provide the gate valve 100 having improved sealing ability and cost reduction and excellent sealing ability.

(Fluidized gas supply switching mechanism)

The fluidized gas supply switching mechanism S supplies the fluidized gas supply source 9 and the fluidizing gas for fluidizing the sealing material 5 to the valve boxes 1, 21 and 31, A fluidizing gas pipe 11 for connecting the inside 1B, 21B and 31B of the main body 1 and the outside 1C, 21C and 31C and a fluidizing gas valve 12 are provided. The fluidized gas supply switching mechanism S supplies the fluidized gas to the valve box (not shown) through the fluidized gas pipe 11 during the movement period in which the valve bodies 2, 22, 32 move between the valve body lowered position and the valve body raised position 1 to the inside 1B of the valve box 1 and does not supply the fluidizing gas to the inside 1B of the valve box 1 in a period other than the moving period. That is, the fluidizing gas supply switching mechanism S switches the gas flow rate to be supplied to the fluidizing gas supply port 10 provided in the lower portion 1F of the valve box 1.

The switching of the gas flow rate is directly performed by changing the opening degree of the fluidizing gas valve 12. [ In this embodiment, since the supply of the fluidized gas is stopped during the period in which the valve body 2 is not raised or lowered, the fluidized gas valve 12 is required to have a function of abolishing the gas. In the case of using only two types of valve opening degrees, that is, opening or closing, a gate valve can be used for the fluidizing gas valve 12. When the valve opening degree is set to a finer level, the fluidizing gas valve 12 may be a flow control valve having a shutoff function. Commercially available ones can be used for these gate valves and flow rate adjusting valves. When the valve opening degree is adjusted by using the flow rate adjusting valve, a flow meter may be additionally provided in the channel, and the valve opening degree may be controlled based on the output value. The valve opening degree may be adjusted manually, or may be automatically controlled by providing a control device and a valve actuator.

In the case of using a gas for burning a carbide as a fluidizing gas, the same mechanism as described above can be used.

A fluidizing gas pipe 11 for supplying a fluidizing gas for flowing the sealing material 5 and a fluidizing gas for burning the carbide in the sealing material 5 to the valve box 1 may be provided. Alternatively, the fluidizing gas pipe 11 may be used as a premise for providing a gas supply switching mechanism such as a three-way valve for each fluidized gas species supply source.

When the valve is closed, that is, when the high-temperature gas inflow pipe 3 is inserted into the inside 2A of the valve body 2, contact with the upper end of the high-temperature gas inflow pipe 3 The lid 18 may be provided on the inside 2A of the valve body 2. [ It is inevitable that caulking or tar adheres to the surface of the hot gas inflow pipe 3 due to solidification of caulking or tar condensation so that the working gas flows out to the outflow pipe 4 only by the lid 18 Completely blocking is generally difficult. However, when the working gas flows through the gap between the lid 18 and the upper end of the hot gas inflow pipe 3, the working gas introduced from the inflow pipe 3 comes into contact with the lid 18, so that a pressure loss occurs. And the working gas flowing from the gap toward the outlet pipe 4 is blocked by the sealing material. By providing the lid 18 together with the sealing by the sealing material 5 as described above, the sealing performance of the entirety of the high-temperature furnace gas gate valve 100 can be improved.

In order to raise and lower the valve body 2 between the valve body rising position and the valve body falling position, the valve body lifting device 8 connected to the valve body 2 is operated. A bellows 14 is provided between the valve body 2 and the valve box 1 to maintain the valve box 1 in an airtight state. Further, the bellows 14 absorbs the influence of the relative movement amount between the valve body 2 and the valve box 1. That is, the bellows 14 has elasticity, and it extends and contracts in the extending direction of the bellows 14 while keeping the inner state of the bellows 14 in a hermetic state. As a result, even if the valve box 1 and the valve element 2 move relative to each other, the space inside the valve box 1 is kept airtight.

When the valve body 2 is moved from the valve body lifting position to the valve body lowering position, if the sealing material 5 is in a stopped state, a large propelling resistance is large and a large and powerful propelling device is required. Therefore, in this embodiment, when the valve element 2 is lifted up and down in the sealing material 5, the sealing material 5 stopped at the inside 1B of the valve box 1 is fluidized. By raising and lowering the valve body 2 in the fluidized sealing material 5, the force (resistive force) against the thrust force is reduced. Thereafter, the fluidization of the sealing material 5 is stopped to restore the sealing property of the sealing material 5. By doing so, it is possible to stably insert the valve element 2 deep into the layer of the sealing material 5 with a relatively small driving force. The fluidizing gas is supplied from the fluidizing gas flow inlet 10 of the lower portion 1F of the valve box 1 to the valve box 1 through the fluidizing gas piping 11, . The fluidized gas supplied into the valve box 1 is dispersed by the dispersing plate 6 and flows through the layer of the sealing material 5 placed on the dispersing plate 6 to form the sealing material 5 by the fluid resistance, .

Even if the fluidized gas is supplied to the fluidized sealing material 5 when the gate valve 100 shown in Fig. 2 is removed, the gas can not flow out into the first space 19 on the side of the inflow pipe 3 , The sealing material 5 in the inner wall of the valve body 2 and the region R fitted to the outer wall of the inflow pipe 3 may not be fluidized. In this case, there is a possibility that the sealing material 5 that does not fluidize moves upward as the valve element 2 is lifted, and a part of the sealing material 5 falls into the opening portion 3A of the inflow pipe 3 . In order to prevent this phenomenon, a flange 17 may be provided on the periphery of the upper end of the inflow pipe 3 toward the outside. The flange 17 is provided so that the lower end 2B of the valve element 2 is positioned above the opening 3A of the inlet pipe 3 with the rise of the valve element 2, The sealing member 5 attached to the inside of the sealing member 2 can be forcibly dropped. Therefore, it is possible to prevent the sealing material 5 attached to the inside of the valve body 2 from falling into the inlet pipe 3 from the opening 3A.

Generally, the pull-out resistance force in the case of pulling out is much smaller than the propulsion force required for deeply inserting the valve plug 2 into the stationary sealing material 5. Therefore, it is not necessary to use an extremely strong valve body lifting device 8 to perform such pulling.

In the present embodiment, when the gate valve 100 is opened, the working gas flows into the valve box 1 from the hot gas inlet pipe 3, and the working gas flows out from the hot gas outlet pipe 4 . In contrast to this operation, when the gate valve 100 is open, the high-temperature working gas is introduced into the valve box 1 from the high-temperature gas outflow pipe (first flow pipe) 4, (The second flow path tube) 3 may be employed. Further, in the present embodiment, the valve body lifting device 8 is used to raise and lower the valve body 2 to realize opening and closing of the gate valve. Contrary to this structure, there is no problem as a valve even if the gate valve is opened and closed by fixing the valve body 2 and raising and lowering the valve box 1 by the separately installed valve box lifting device. In this case, between the high temperature gas inflow pipe 3 and the valve box 1 and between the hot gas outflow pipe 4 and the valve box 1, Absorbing) bellows may be installed separately.

(Second Embodiment)

In the state of FIG. 2, a gas capable of burning a carbide as a fluidizing gas is supplied from the fluidizing gas inlet 10 to the valve box 1 through the fluidizing gas pipe 11. The fluidizing gas passes through the sealing material (5) to burn and remove the carbide contained in the sealing material (5). As a result of the combustion, the generated gas such as carbon dioxide is discharged from the outflow pipe 4 to the outside of the valve together with the fluidizing gas reaching the upper surface of the sealing material 5. In this embodiment, since the fluidizing gas is supplied in a state in which the valve element 2 is not moved in the sealing material 5, it is not necessary to flow the sealing material 5 with the fluidizing gas. Therefore, the supply amount of the fluidizing gas can be set to be smaller than the flow amount capable of flowing the sealing material 5. Thus, by adjusting the supply amount of the fluidizing gas, the burning rate of the carbide mixed in the sealing material 5 can be set in a suitable range. For example, by setting the fluidizing gas supply amount sufficiently small, it is possible to prevent overheating in the valve due to combustion of carbide.

(Third Embodiment)

Fig. 3 shows the opened state of the gate valve 200, and Fig. 4 shows the closed state of the gate valve 200. As shown in Fig. The arrow F shown in Fig. 3 indicates the direction in which the working gas flows.

In the present embodiment, a part of the hot gas inflow pipe (first flow path tube) 23 is used as a valve body. Specifically, the high-temperature gas inflow pipe 23 extends upward from the upper portion 21D of the valve box 21 to the inside 21B and the upper portion 21D of the valve box 21, The lower end 23C side of the valve body 23 is inserted into the inside 21B of the valve box 21 and the upper end 23B side is connected to the outside 21C. The high temperature working gas flows into the inside 21B of the valve box 21 from the lower end portion 23C through the upper end portion 23B of the hot gas inflow pipe 23.

When the gate valve 200 is open, the hot working gas flows into the valve box 21 from the hot gas inlet pipe 23 and flows out of the hot gas outlet pipe (second flow pipe) 24 . The position of the valve body (high temperature gas inflow pipe 23) at this time is referred to as a valve body rising position. The lower portion 23C of the high temperature gas inflow pipe 23 is buried in the sealing material 5 when the gate valve 200 is being closed so that the inside 21B of the valve box 21 is filled with the high temperature gas inflow pipe 23 And the second space 20 (including the interior of the valve box 21) on the side of the hot gas outlet pipe 24 (the space including the inside of the valve body 22) . As a result, the flow of hot working gas from the hot gas inlet pipe 23 to the hot gas outlet pipe 24 is inhibited. The position of the valve body (hot gas inflow pipe 23) at this time is referred to as a valve body lowering position. The elevating and lowering of the hot gas inflow pipe 23 is performed by the valve body elevating device 8 connected to the hot gas inflow pipe 23. [ The change in the relative position between the valve box 21 and the inflow pipe 23 is absorbed by the bellows 14 to secure the hermeticity of the valve box 21. [ The positional relationship of the valve body (hot gas inflow pipe 23) to the sealing material 5 and the positional relationship between the hot gas outflow pipe 24 and the fluidized sealing material 5 are the same as those of the first embodiment.

The sealing material 5 in the hot gas inflow pipe 23 may not be fluidized even when the sealing material 5 is fluidized when the gate valve 200 is in the lowered state , A difference in thermal expansion amount between the hot gas inflow pipe (23) and the sealing material (5) occurs, and the sealing material (5) is compressed. At this time, when the hot gas inflow pipe 23 is raised, the sealing material 5 is lifted together with the hot gas inflow pipe 23 without falling. The sealing material 5 remains in the inside 23D of the hot gas inflow pipe 23 and the hot gas inflow pipe 23 is closed although the gate valve 200 is opened. In order to prevent this phenomenon, a sealing material remover (sealing material) 23 installed in the bottom portion 21A of the valve box 21 and inserted into the inside 23D of the inlet pipe 23 at least when the gate valve 200 is in the closed state Removal member) 15 may be provided on the dispersion plate 6. [ The diameter of the upper end portion of the sealing material remover 15 is set larger than the downward direction. Thereby, when the hot gas inflow pipe 23 rises, the center portion of the sealing material 5 remaining in the inside 23D of the hot gas inflow pipe 23 lifted together with the hot gas inflow pipe 23, Is scraped off from the upper end of the seal material remover (15). When a part of the sealing material 5 is scraped off, the compressive force acting on the sealing material 5 is unloaded. As a result, the sealing material 5 restrained in the high-temperature gas inflow pipe 23 falls due to gravity, and the obstruction of the high-temperature gas inflow pipe 23 can be avoided. It is preferable that the upper end portion of the sealing material remover 15 is disposed above the surface 5A of the sealing material 5 when the sealing material 5 is not fluidized.

The flow direction of the high temperature working gas may be reversed (a flow path system in which the working gas flows out from the high temperature gas inflow pipe 24 to the hot gas inflow pipe 23) as in the first embodiment. Further, even if the valve box 1 is raised and lowered in place of the valve body (the hot gas inflow pipe 23), there is no problem.

(Fourth Embodiment)

Fig. 5 shows the opened state of the gate valve 300, and Fig. 6 shows the closed state of the gate valve 300. As shown in Fig. The arrow F shown in Fig. 5 indicates the direction in which the working gas flows.

The present embodiment is different from the first embodiment in the position of the hot gas inflow pipe (first flow pipe) 33 and the shape of the valve body 32. That is, as shown in Fig. 5, the inflow pipe 33 is provided on the side surface 31E of the valve box 31. As shown in Fig. 6, the valve element 32 is buried in the sealing material 5 by moving the valve element 32 from the upper portion 31D to the bottom portion 31A of the valve box 31 as shown in Fig. The position of the surface 5A of the sealing material 5 is raised and the sealing material 5 is adhered to the inside of the inflow pipe 33 and the inside of the outflow pipe 34 by the burring of the valve element 32 in the sealing material 5. [ ≪ / RTI > As a result, the opening 33A of the inlet pipe 33 and the opening 34A of the outlet pipe 34 are closed.

5, the surface 5A of the sealing material 5 is in contact with the opening 33A of the inflow pipe 33 and the outflow pipe (second flow path pipe) in the stationary state in which the sealing material 5 is not fluidized, Is not allowed to flow into the opening (34A) of the housing (34).

The inside 31B of the valve box 31 is connected to the hot gas inflow pipe 33 by the sealing material 5 excluded by the valve body 32 when the gate valve 300 shown in Fig. (The space including the inside of the hot gas inflow pipe 33) and the inside of the hot gas outflow pipe 4 (the inside of the hot gas outflow pipe 34) 20]. When the gate valve 300 shown in Fig. 5 is opened, the hot working gas flows into the valve box 31 from the hot gas inlet pipe 33 and flows out of the outlet pipe 34. The position of the valve body 32 at this time will be referred to as a valve body rising position. A part of the sealing material 5 is adhered to the high temperature gas inflow pipe 33 and the high temperature gas inflow pipe 33 by the valve body 32 in which the lower end portion 32A is buried in the sealing material 5 when the gate valve 300 is being closed, (Pressed out) to close the openings 33A of the hot gas inflow pipe 33 and the openings 34A of the hot gas outflow pipe 34. As a result, As a result, the space around the valve box 31 is separated from the first space 19 on the side of the hot gas inflow pipe 33 and the second space 20 on the side of the hot gas outflow pipe 34, The flow of hot working gas from the inlet pipe 33 to the hot gas outlet pipe 34 is inhibited. The position of the valve body at this time is referred to as the valve body lowering position. The term " space around the valve box 31 " refers to a space communicating with the valve box 31 (including the inner space of the valve box 31 itself) . Specifically, the space around the valve box 31 is, for example, a space in the inflow pipe 33 and the outflow pipe 34 in the present embodiment. The valve body 32 is lifted and lowered by the valve body lifting device 8 connected to the valve body 32. By providing the bellows 14, the relative positional change of the valve box 31 and the valve body 32 is absorbed, and the hermeticity of the valve box 31 is ensured.

Even when the flow direction of the high temperature working gas is reversed (a flow path system in which the working gas flows out from the hot gas outflow pipe 34 to the hot gas inflow pipe 34) as in the first or third embodiment, The valve box 31 can be raised and lowered in place of the valve box 31,

(Fifth Embodiment)

7 (open state) and Fig. 8 (closed state) will be described for the gate valve 400 in which the pads 121 are added to the apparatuses of Figs. 1 and 2. The pad 121 is composed of an inner ring-shaped pad and an outer ring-shaped pad. The valve body 2 passes between the inner and outer pads and can open and close the valve. The pads 121 are stacked on the sealing member 5. The working gas introduced into the valve box 1 from the inflow pipe 3 generates a strong airflow in the valve box 1. However, in the present embodiment, this severe air flow does not directly come into contact with the sealing material 5 by the pad 121, so that the amount of the sealing material 5 scattered by the airflow in the valve box 1 can be suppressed have.

(Sixth Embodiment)

The present embodiment will be described using the apparatus shown in Fig. 9 in which the valve box 1 of the apparatus shown in Figs. 1 and 2 is disposed in the heating furnace 124. Fig. The temperature of the heating furnace 124 is set at room temperature and the fan 122 is connected to the outflow pipe 4 to perform suction and air at room temperature as the working gas is sucked from the inflow pipe 3 to the valve box 1 And then flows out from the outflow pipe 4. At the outlet of the outflow pipe (4), a filter (123) is installed to recover the scattered seal material (5). The flow pipe (4) is provided with a flow meter (125) and a pressure gauge (126). By employing such a device configuration, the characteristics of the gate valve can be measured. That is, the pressure loss coefficient of the valve can be obtained by performing the suction by the fan 122 in the valve open state and using the measured values of the flow rate and the pressure at this time (pressure loss coefficient = 2 x pressure measurement value / Inlet pipe flow] ² ). Next, the leak rate of the valve can be obtained by performing suction by the fan 122 in the closed state of the valve, using the flow rate, the measured value of the pressure, and the pressure loss coefficient obtained as described above. Further, the filter 122 is sucked for a predetermined time, and the mass of the particles collected in the filter 123 during this period is taken out and weighed to obtain the sealing material scattering mass flow rate.

For example, an inlet pipe and an outlet pipe having a diameter of 80 mm are connected to a valve box having a diameter of 200 mm and a height of 600 mm, and zircon beads having a diameter of 60 to 120 탆 are sealed as a sealing material in a thickness of 80 mm at the bottom of the valve box . Here, when the lower end of the valve body is a gate valve which can be buried up to a depth of 50 mm, the leak rate of the valve can be made 0.005% or less of the valve capacity coefficient (Cv value). When the suction is performed at a flow rate of 50 m ³ / h in the open state of this valve, the flow rate of the sealing material scattering mass can be set to 70 g / h.

Further, it is possible to obtain the driving force at the time of closing the valve from the air supply pressure to the air cylinder during the valve closing operation by using the air cylinder as the valve driving device. The thrust force at the time of supplying the air with the pressure of 0.001 MPa as the fluidizing gas from the fluidized-gas pipe 11 into the valve box 1 is set at the lowest thrust force required for closing the valve Propulsion force) can be obtained. For example, in the case of the above-described valve, the propulsive force required for closing the valve may be 10 N or less.

(Seventh Embodiment)

The leak rate of the valve is set to be equal to or smaller than the value of Cv in the same manner as in the sixth embodiment except that the pad of the alumina fiber type and having the thickness of 40 mm is mounted on the sealing material in the same manner as in Figs. 0.005%, and the flow rate of the sealing material scattering mass when the suction is performed at a flow rate of 50 m ³ / h in the open state can be set to 25 g / h.

(Eighth embodiment)

The leak rate of the valve is set to 0.1% or less of the Cv value and the flow rate of the valve of 50 m < ³ > / h in the open state can be obtained by setting all of the conditions other than the use of zircon beads having a diameter of 120 [ The flow rate of the sealing material scattering mass in the case of sucking at a flow rate can be set at 1 g / h.

(Valve box)

When the fluidized gas of appropriate pressure is supplied from the bottom portions 1A, 21A and 31A of the valve boxes 1, 21 and 31 into the valve boxes 1, 21 and 31, the sealing material 5 acts as a fluidized sealing material do. With respect to the fluidized sealing material applied in the present embodiment, a standard design method has been established as disclosed in the aforementioned Non-Patent Document 1. That is, the setting of the diameter and height of the valve box, the particle diameter of the sealing material, the thickness of the sealing material layer, the gas supply pressure and flow rate, and the structure of the dispersion plate are suitably selected based on the standard design method disclosed in Non-patent Document 1 . The diameters of the valve boxes 1, 21, and 31 may be, for example, 100 mm or more and 1 m or less. The height of the valve box 1 may be, for example, 100 mm or more and 4 m or less. The thickness of the sealing material 5 may be, for example, 30 mm or more and 1 m or less. The opening diameters of the hot gas inflow pipes 3, 23 and 33 and the hot gas outflow pipes 4, 24 and 34 in the valve boxes 1, 21 and 31 are, for example, 10 mm to 300 mm . Punch metal or wire mesh can be used for the dispersing plate 6. Instead of the dispersion plate 6, a fluidized gas may be supplied using a general grid tube or a porous cap.

The flow form of the fluidized sealing material 5 is desirably designed to be a uniform fluidization, but it may be fluidized to such an extent as not to cause slugging. The object of fluidization of the sealing material 5 in the present embodiment is to simply reduce the resistance of the sealing material 5, so that fluidization may be minimized. That is, the flow rate of the supplied fluidizing gas may be set so as to be a flow rate slightly larger than the minimum fluidization velocity unique to the selected sealing material 5. [ When the flow rate of the fluidizing gas is set as described above, the thickness of the fluidized sealant (the maximum thickness of the fluidized sealant) at the time of fluidizing gas injection can be maintained at, for example, less than two times of the stopping time. When the flow rate of the gas supplied to the valve boxes 1, 21 and 31 is extremely larger than the flow rate corresponding to the minimum fluidization rate, a part of the fluidized sealing material 5 flows into the hot gas outlet pipes 4, It flows out to the inflow pipes 3, 23 and 33, which is not preferable. The openings 3A, 23A and 33A of the hot gas inflow pipes 3, 23 and 33 and the openings 4A and 24A of the hot gas outflow pipes 4, 24 and 34 in the valve boxes 1, , 34A should be disposed at a position higher than the upper end position (maximum thickness of the fluidized sealing material) at which the sealing material 5 reaches when the sealing material 5 is fluidized.

(Valve body lifting device)

When the valve body lifting device 8 is provided outside the heating furnace (above the furnace wall 16 of the heating furnace), a commercially available actuator capable of moving up and down can be used. For example, an air cylinder, a hydraulic cylinder, a rack and pinion propulsion device, a ball screw propulsion device, or a linear motor may be used. A heat resistant actuator may be used for the valve body lifting device 8 and this may be provided in the furnace to reduce the size of the device. The method of adjusting the lifting position of the valve bodies 2, 22, 32 may be performed manually, or may be automatically controlled by providing a distance meter, a load meter, and a control device. The stroke of the valve body lifting device 8 may be, for example, 50 mm or more and 2 m or less.

(Heating device)

The heating device 13 for heating the fluidizing gas is a device for preheating the fluidizing gas to prevent the valve from being cooled by the fluidizing gas, and is selectively installed. The heating device 13 may be a general heat exchanger of a fuel gas or a small-sized heat exchanger, and may simply heat the gas by heat input from the furnace body to the pipeline by setting the fluidizing gas piping passage to be long.

(Material of structural material of gate valve)

The apparatus arranged in the furnace can be used in any apparatus as long as it has required strength, rigidity and durability in an environment from room temperature to about 850 ° C or as high as about 900 ° C. For example, the bellows 14, which is a component to be deformed, may be made of a heat resistant stainless steel, a heat resistant cobalt alloy, or a metal such as a heat resistant nickel alloy such as inconel or Hastelloy, or a heat resistant ceramic fiber Carbon fiber reinforced carbon composite material, alumina, calcium oxide, magnesia, silicon carbide, fused quartz, mullite, zirconia, porphyrin, and the like in addition to the above-mentioned materials in addition to the above- Tandem seal, alumina cement, or silicon nitride can be used. When a material having low oxidation resistance such as graphite is used as a material constituting the high temperature furnace gas gate valve, these materials can be applied by keeping the furnace in a non-oxidizing atmosphere, for example, a nitrogen atmosphere.

Since there are no particular restrictions on the devices installed outside the furnace, commercially available equipment of standard materials can be used.

(Sealing material)

A granular material which has strength capable of withstanding fluidization at a high temperature of from about room temperature to about 850 ° C or about 900 ° C and which does not cause a chemical reaction with the working gas, own pyrolysis, phase change, remarkable sintering, Any material can be used. For example, fused quartz, alumina, calcium oxide, magnesia, zircon, stabilized zirconia, titanium oxide, silicon nitride, or silicon carbide can be used. Particularly, when the gate valve is used at a temperature of 800 ° C or higher, it is preferable to use alumina, magnesia, zirconium, stabilized zirconia, titanium oxide, silicon nitride or silicon carbide from the viewpoint of particle stability.

The particle diameter of the sealing material is preferably 10 mu m or more and 1 mm or less in diameter, more preferably 40 mu m or more and 500 mu m or less. It is particularly preferable that the average particle diameter is 100 mu m or more and 300 mu m or less. When the particle diameter is smaller than 10 mu m, the surface force of the particles is excessive, so that even if gas is supplied from the bottom of the fluidized sealing material, the entire sealing material layer can not be fluidized. When the particle diameter is larger than 1 mm, the sealing material 5 is fluidized when the flow rate of the fluidizing gas is increased. However, large bubbles are generated in the fluidized sealing material and rupture on the surface of the fluidized sealing material. This rupture causes a problem that the rolled up sealing material flows out to the downstream, which is not suitable. The shape of the sealing material is preferably spherical. The above-mentioned " particle with little change in physical properties " means that the sealing material has strength enough to withstand fluidization at a high temperature of about 850 DEG C to about 850 DEG C or about 900 DEG C as described above, (Solid phase and liquid phase) derived from an operating gas such as COG is mixed with a particulate material which does not cause chemical reaction, own pyrolysis, phase change, significant sintering and phase transformation, Group). For example, at a high temperature of from about room temperature to about 850 ° C or about 900 ° C, it has strength enough to withstand fluidization, and also causes chemical reaction with the working gas, own thermal decomposition, phase change, significant sintering, If carbides such as tar adhere to the surface of the particles, the physical properties of the particles will be slightly changed. However, in the case of a granular material having a strength capable of withstanding fluidization at a high temperature of from about room temperature to about 850 ° C or about 900 ° C and which does not cause chemical reaction with the working gas, own thermal decomposition, phase change, remarkable sintering, When the material occupies at least a majority of the mass of the sealing material, the sealing material has a strength which can withstand the fluidization at a high temperature of from about room temperature to about 850 캜 or about 900 캜. Further, the sealing material can be said to be a granular material which does not cause a chemical reaction with the working gas, thermal decomposition of itself, phase change, remarkable sintering and phase transformation, that is, little change in physical properties. In the first and second inventions, whether or not such a mixture is present in the sealing material need not be taken into consideration, but in the third invention, it is preferable that the carbide which is mixed into the sealing material and forms itself a kind of sealing material is removed by combustion . Therefore, it is presupposed that such a mixed material is present in the sealing material.

These sealing materials may be commercially available ones or chemically synthesized ones.

(Fluidizing gas)

The fluidizing gas flowing through the sealing material can be any gas that does not corrode or contaminate the device or the sealing material and does not cause a strong reaction with the working gas. For example, gases such as nitrogen, carbon dioxide, helium, argon, methane, natural gas, LPG, or dry COG can be used.

As the fluidizing gas capable of burning the carbide, any material can be used as long as it reacts with the carbide to gasify the carbide and does not corrode the apparatus or the sealing material. For example, air, oxygen, water vapor, or the like can be used.

(pad)

The pad is preferably a material which is stable in the operating temperature range of the valve, and is light in weight so as not to interfere with the flow of the sealing material. For example, porous or fiber-shaped ceramics can be used. As ceramics, alumina, silicon carbide and the like can be used for a wide range of operating gas species. In the case where the non-oxidizing working gas is used as the premise, carbon may be used.

The pad is preferably thick from the viewpoint that it is not easily moved by the airflow in the valve box. On the other hand, when the pad is thick, there is a problem that the valve becomes large. Therefore, the thickness of the pad is preferably in the range of about 2 to 500 mm.

(High temperature working gas)

The operating gas (high-temperature gas) used in the present embodiment is not limited to the wet COG as described so far, but is a problem of contamination and corrosion of the valve seat and the valve body due to the gas component, For example, zinc vapor, petroleum gas containing heavy oil vapor, and the like.

While the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these examples. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the appended claims. It is understood that it belongs to the technical scope of the present invention.

For example, the sealing material is fluidized by the fluidizing gas supply switching mechanism S. Alternatively, the valve element 2 may be rotated by the opening and closing operations of the gate valves 100, 200, You can.

The valve body 1, the valve element 2, the inflow pipe 3, the outflow pipe 4, the fluidized gas pipe 11, the heating device 13, In the heating furnace. Thereby, the temperature difference between the parts of the gate valve can be reduced. In the prior art, the valve for circulating the hot gas maintains the inside of the valve, which is a contact portion with the hot gas, at a high temperature and maintains the outside of the valve at a low temperature to secure the strength and operability of the valve. On the premise of such a design, when a heating device is not installed in the valve, the hot gas passing through the valve is cooled by the valve. Thus, for example, when wet COG is circulated, there is a problem that tar is deposited on the inner surface of the valve. It is also conceivable to provide a heating device inside the valve to avoid generation of heat from the hot gas passing through the valve. In this case, since the temperature difference between the inside and the outside of the valve is large, it is difficult to uniformly control the inside of the valve to a constant temperature. In these prior art valves, since a large temperature difference is given between the parts of the valve, there arises a problem that when the valve is used at a high temperature of 850 DEG C or the like, a large thermal stress is generated and the service life of the valve is remarkably reduced . Therefore, by arranging the gate valve in the heating furnace maintained at substantially the same temperature as the high temperature gas (gas) passing through the valve, the temperature of the entire gate valve can be kept uniform and constant. Thereby, it is possible to avoid the problem in the above-described conventional technique.

100, 200, 300: High temperature furnace gas gate valve (gate valve)
1, 21, 31: Valve box
2, 22, 32: valve body
3, 23, 33: hot gas inflow pipe (first flow pipe)
4, 24, 34: hot gas outflow pipe (second flow pipe)
5: Seal material
5A: Surface of the sealing material
6: Dispersion plate
8: Valve body lifting device
10: fluidized gas inlet
11: Fluidized gas piping
12: Fluidized gas valve
19: first space of inlet observation
20: second space of the outflow observation
121: Pad
122: Fan
123: Filter
124: heating furnace
125: Flowmeter
126: Pressure gauge
S: fluidized gas supply switching mechanism

Claims (11)

A granular sealing material capable of flowing in a temperature range of room temperature to 900 DEG C,
A valve box in which the sealing material is stored in a bottom portion,
A first flow pipe connected to the valve box for introducing gas from the outside of the valve box toward the inside,
A second flow pipe connected to the valve box for discharging gas from the inside of the valve box toward the outside,
The seal member is at least partly buried in the sealing member and descends to a valve body lowering position for inhibiting the flow of gas from the first flow path to the second flow path, and is disposed above the surface of the sealing member, A valve body rising from a first flow pipe to a valve body rising position where gas flows into the second flow pipe,
A valve body lifting device for lifting the valve body between the valve body lowering position and the valve body lifting position,
And a fluidizing gas piping for supplying a fluidizing gas for flowing the sealing material from the outside of the valve box to the inside thereof,
Wherein the fluidizing gas supply switching mechanism supplies the fluidizing gas to the inside of the valve box through the fluidizing gas pipe during a moving period in which the valve body moves between the valve body lowering position and the valve body lifting position, The flow of the fluidizing gas is switched so as not to supply the fluidizing gas to the inside of the valve box. delete A valve box having a granular sealing material capable of flowing in a high temperature range from room temperature to 900 DEG C,
The valve box is provided with a hot gas outlet pipe connected above the surface of the sealing material,
A hot gas inflow pipe connected to the valve box so that an opening is arranged above the surface of the sealing material at least in an open state of the valve,
Wherein the seal material is used to restrict the flow of hot gas between the hot gas inlet pipe and the hot gas outlet pipe in the closed state of the gate valve, A valve body disposed at a lowered position and being located at a valve body raised position which is a position where all of the valve bodies exist above the surface of the sealing material in an open state of the gate valve;
A valve body lifting device for changing the arrangement of the valve body between the valve body lowering position and the valve body lifting position;
A fluidizing gas pipe connected to a lower portion or a lower portion of the sealing material for supplying a fluidizing gas for burning a carbide mixed in the sealing material to the valve box,
And a fluidized-gas switching mechanism for switching the gas burning the carbide into a supply state or a stop state. The valve apparatus according to claim 1, wherein when the valve body is lowered to the valve body lowering position, a space inside the valve box is separated from a first space including the inside of the valve body and a second space other than the valve body And the gate valve. 2. The valve apparatus according to claim 1, wherein when the valve body is lowered to the valve body lowering position, a space inside the first flow path tube, inside the second flow path tube, and inside the valve box, And a second space including the interior of the second flow path. The gate valve according to claim 1 or 3, characterized in that a pad for suppressing scattering of the sealing material is mounted on the upper surface of the sealing material. The gate valve according to claim 1 or 3, characterized in that the fluidizing gas is an oxidizing gas containing oxygen. 4. The semiconductor device according to claim 1 or 3, wherein the sealing material is made of one or more materials selected from alumina, magnesia, zircon, stabilized zirconia, titanium oxide, silicon nitride, or silicon carbide. valve. The gate valve according to claim 4, characterized in that a pad for suppressing scattering of the sealing material is mounted on the upper surface of the sealing material. The gate valve according to claim 4, wherein the sealing material is made of at least one selected from alumina, magnesia, zircon, stabilized zirconia, titanium oxide, silicon nitride, or silicon carbide. The gate valve according to claim 5, wherein the sealing material is made of at least one selected from alumina, magnesia, zircon, stabilized zirconia, titanium oxide, silicon nitride, or silicon carbide.

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