JP2014047041A - Solid supply system and solid supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new solid supply system and a new solid supply method.SOLUTION: A solid supply system for supplying a solid to the atmospheric-pressure outside of a storage device from the pressurized storage device includes the storage device for housing the solid in a pressurized sate, and a lock hopper connected in the gravity direction of the storage device. Furthermore, the lock hopper comprises a water supply passage for supplying water into the lock hopper, and a valve for adjusting the movement of the solid, which is provided in a part connected to the storage device.

Description

  The present invention relates to a solid supply system and a solid supply method.

A lock hopper is a device for supplying solids from one device to another. Since the lock hopper can be used even under pressurized conditions, it is used in an apparatus that gasifies solid fuel such as coal (see, for example, Patent Documents 1 and 2).
However, until now, there has been reported a method of pressurizing the lock hopper after supplying solids to the lock hopper from a normal pressure device, but a method of supplying solids from the pressurized device to the lock hopper has been reported. Absent.

JP 2005-126594 A JP 2010-254382 A

  An object of the present invention is to provide a novel solid supply system and a novel solid supply method.

  When the solids are supplied to the lock hopper under normal pressure from the pressurized device, the momentum of the supplied solids becomes too strong, and the impact is given to the lock hopper. As a result, the lock hopper is easily broken. I discovered that the problem of becoming. The solid supply system and the solid supply method according to the present invention can solve this problem.

That is, the solid supply system according to the present invention is a solid supply system for supplying solids from a storage device in which the inside is pressurized to a lock hopper that is at normal pressure, and is in a pressurized state. And a lock hopper connected in the gravitational direction of the storage device, and a valve for adjusting the movement of the solid at a connecting portion between the storage device and the lock hopper. A solid supply system including a water supply path for supplying water to the inside of the lock hopper. With such a solid supply system, even if solid is supplied from a pressurized storage device to a normal pressure lock hopper, the water accumulated in the lock hopper by supplying from the water supply path is stored. Since the momentum of the solid supplied from the device can be absorbed, the impact of the solid on the lock hopper can be reduced. As a result, the lock hopper can be prevented from being damaged, and can be constantly removed from the pressurized storage device. Solids can be fed into the pressure lock hopper.
It is preferable that the lock hopper further includes a pressure extraction path. By setting it as such a structure, the internal pressure of the lock hopper to which the solid was supplied can be reduced through a pressure extraction path. Then, after reducing the internal pressure of the lock hopper, the solid in the lock hopper is discharged to the outside, so that the momentum of the discharged solid can be weakened. As a result, the device that receives the discharged solid is damaged. Or the discharged solid can be prevented from scattering.
Preferably, the valve is configured not to open unless a predetermined amount of water accumulates in the lock hopper. With this configuration, the solid is supplied from the storage device to the lock hopper only after a predetermined amount of water has accumulated inside the lock hopper, so the momentum of the solid supplied to the lock hopper is Therefore, it is surely absorbed by the water inside the lock hopper, and as a result, the lock hopper can be more reliably prevented from being damaged.
Here, the predetermined amount of water is preferably an amount in which an air layer remains in the lock hopper. With the air layer remaining in the lock hopper, the air layer is compressed by pressure by supplying the solid from the pressurized container to the normal pressure lock hopper. Can be easily.
The volume of the air layer is preferably larger than the volume of the solid at normal pressure. With this configuration, when the solid is supplied from the pressurized container to the lock hopper, the air layer in the lock hopper is compressed by pressure, so that the volume of the solid in the lock hopper is the same. Since the space more than the extent is vacant, the supply of the solid to the lock hopper can be facilitated.

The solid supply method according to the present invention is a method for supplying a solid contained in a storage device from a storage device in which the interior is pressurized to a normal pressure lock hopper connected in the gravity direction of the storage device. The solid supply method includes a step of supplying water to the lock hopper and a step of supplying solid from the storage device to the lock hopper having the supplied water. By adopting such a solid supply method, even if the solid is supplied from the pressurized storage device to the normal pressure lock hopper, the water in the lock hopper can absorb the momentum of the supplied solid. Therefore, the impact applied to the lock hopper can be reduced, and as a result, solid can be supplied to the lock hopper while preventing the lock hopper from being damaged.
The solid supply method according to the present invention further includes a step of reducing the internal pressure of the lock hopper supplied with the solid, and a step of discharging the supplied solid out of the lock hopper from the lock hopper with the reduced internal pressure. It may be included. After reducing the internal pressure of the lock hopper, the solids in the lock hopper can be discharged to the outside so that the momentum of the discharged solids can be weakened. As a result, the device that receives the discharged solids can be damaged. It is possible to prevent the discharged solid from being scattered.
The step of supplying water preferably supplies water to the lock hopper so as to leave an air layer inside the lock hopper. By supplying the solid to the lock hopper from the pressurized container with the air layer remaining in the lock hopper, the air layer is compressed by the pressure, so that the supply of the solid to the lock hopper is facilitated. be able to.
The volume of the air layer is preferably larger than the volume of the solid at normal pressure stored in the storage device. With this configuration, when the solid is supplied from the pressurized container to the lock hopper, the air layer in the lock hopper is compressed by pressure, so that the volume of the solid in the lock hopper is the same. Since the space more than the extent is vacant, the supply of the solid to the lock hopper can be facilitated.

  According to the present invention, a novel solid supply system and a novel solid supply method can be provided.

It is a figure showing the whole solid supply system composition explained as one embodiment of the present invention. It is a figure which shows the whole structure of the solid supply system demonstrated as other embodiment of this invention.

  Hereinafter, embodiments of the present invention completed based on the above knowledge will be described in detail with reference to the accompanying drawings. The objects, features, advantages, and ideas of the present invention will be apparent to those skilled in the art from the description of the present specification, and those skilled in the art can easily reproduce the present invention from the description of the present specification. it can. The embodiments and specific examples of the invention described below show preferred embodiments of the present invention and are shown for illustration or explanation, and the present invention is not limited to them. It is not limited. It will be apparent to those skilled in the art that various modifications and variations can be made based on the description of the present specification within the spirit and scope of the present invention disclosed herein.

== Solid supply system ==
FIG. 1 is a diagram showing an overall configuration of a solid supply system described as an embodiment of the present invention. As shown in FIG. 1, a solid supply system 600 according to the present invention includes a storage device 610, a lock hopper 620, and a container 630.

The storage device 610 stores the solid in a pressurized state. Therefore, it is preferable that the storage device 610 has pressure resistance. Further, the solid housed in the housing device 610 may be a solid alone or a mixture of a solid and a liquid, but it is considered that the solid can be moved to the lock hopper 620 more easily. If included, it is preferable that it is only a solid. Such a solid may be, for example, a residue after fuel gas is generated from biomass. The temperature of the solid stored in the storage device 610 is not particularly limited, but it is preferably 0 ° C. to 200 ° C. in consideration of suppressing freezing and vaporization of water contained in the solid supply system 600. It is more preferable that it is room temperature-100 degreeC.
In the present specification, “pressurized” means that a pressure higher than atmospheric pressure is applied (in the present specification, atmospheric pressure is also referred to as normal pressure). Although the magnitude | size of the pressure in the accommodating apparatus 610 is not specifically limited, For example, it is preferable that it is 5-100 MPa, it is more preferable that it is 10-50 MPa, and it is further more preferable that it is 20-40 MPa.

  The lock hopper 620 is connected so that the solid housed in the housing device 610 can move into the lock hopper 620 by gravity. For example, there is an opening for discharging the solid at the lower part of the storage device 610, and there is an opening for receiving the solid at the upper part of the lock hopper 620, and these openings are connected without a gap. preferable. Then, it is preferable that the structure of the lock hopper 620 is determined so that when the solid falls by gravity to the lock hopper 620 in which an appropriate amount of water has accumulated from the storage device 610, the lock hopper 620 falls into the water. .

The lock hopper 620 includes a water supply path 640, a pressure extraction path 650, and motorized valves 660 and 670. The position at which the water supply path 640 and the pressure extraction path 650 are connected to the lock hopper 620 is not particularly limited. For example, it is preferable that the water supply path 640 and the pressure extraction path 650 are respectively provided on the side surfaces of the lock hopper 620. Further, since the pressure extraction path 650 can only store water in the lock hopper 620 up to a position below the pressure extraction path 650, in order to clean a wider area inside the lock hopper 620, the lock hopper 620 It is more preferable that the side surface portion is provided at a position close to the upper portion. In addition, the electric valve 660 is provided at a connection portion between the storage device 610 and the lock hopper 620, and the electric valve 670 is provided at a connection portion between the lock hopper 620 and the container 630.
The water supply path 640 further includes an electric valve 645, and the pressure extraction path 650 further includes an electric valve 655 and a solid extraction path 657. The diameters of the lock hopper 620, the water supply path 640, and the pressure extraction path 650 are not particularly limited, but considering the fact that a large amount of solid is moved to the lock hopper 620, the diameter of the lock hopper 620 is The pressure is preferably larger than the supply path 640 and the pressure extraction path 650, and in order to reduce the pressure slowly, taking into account that a strong load is generated when the pressure is extracted from the pressurized state. The extraction path 650 preferably has a smaller diameter than the lock hopper 620 and the water supply path 640.
Note that the lock hopper 620 preferably has pressure resistance, similar to the housing device 610.

  A method of using the lock hopper 620 will be described below.

First, the motor-operated valves 660 and 670 are closed, and the motor-operated valves 645 and 655 are opened, so that the pressure in the lock hopper 620 is maintained at a normal pressure through the pressure extraction path 650 and the water supply path 640 is moved into the lock hopper 620. To supply water. Here, when there is a solid remaining attached to the lock hopper 620 or the electric valve 670, the solid is attached by opening the electric valve 670 while supplying water into the lock hopper 620. It is preferable to wash the solids outside the lock hopper 620 and then close the motorized valve 670. By closing the motor-operated valves 645 and 655 at the time when the required amount of water has accumulated in the lock hopper 620, water can be accumulated in the lock hopper 620 at normal pressure.
The amount of water stored in the lock hopper 620 reduces the impact received by the lock hopper 620 when the solid is moved from the pressurized container 610 to the normal pressure lock hopper 620, thereby damaging the lock hopper 620. The amount should be such that it can be prevented. Those skilled in the art can appropriately set such amounts in consideration of the pressure and temperature and volume of the storage device 610, the temperature and volume of the lock hopper 620, the volume and hardness of the solid, and the like. . For example, it may be 5 to 100 times the volume of the solid, but is preferably 10 to 50 times. Furthermore, the amount of water stored in the lock hopper 620 is more preferably an amount in which an air layer remains in the lock hopper 620. The volume of the air layer is more preferably larger than the volume of the solid stored in the storage device 610 at normal pressure, and more preferably 2 to 10 times the volume of the solid at normal pressure. By storing water so as to leave an air layer in the lock hopper 620, when the solid is supplied from the pressurized container 610 to the normal pressure lock hopper 620, the air layer is compressed by pressure. The supply of solids to 620 can be facilitated. Further, since the volume of the air layer is larger than the volume of the solid housed in the housing device 610 at the normal pressure, the volume close to or larger than the volume of the supplied solid due to the compression of air. Therefore, it is possible to make the lock hopper 620 easier to supply the solid.
Here, after the solid is accommodated in the pressurized state in the accommodating device 610, water is supplied to the lock hopper 620. However, the order of these may be reversed or simultaneously. Also good.

Next, by opening the motor-operated valve 660, the accommodation device 610 and the lock hopper 620 are made into one sealed system. As a result, the solid housed in the housing device 610 in a pressurized state moves from the housing device 610 to the lock hopper 620 due to gravity and a pressure difference between the housing device 610 and the lock hopper 620.
Conventionally, when a solid is supplied from the storage device 610 to the lock hopper 620 at normal pressure, since the momentum of the supplied solid becomes too strong, the lock hopper 620 is strongly impacted. However, the solid supply system 600 according to the present invention has moved to the lock hopper 620 because water is accumulated in the lock hopper 620 when the solid is supplied. Solids can be prevented from colliding with the lock hopper 620 with a strong momentum. As a result, the problem that the lock hopper 620, particularly the motor-operated valve 670 is easily broken, can be solved.
Here, the motor-operated valve 660 reduces the impact received by the lock hopper 620 from the supplied solid, so that an amount of water that can prevent the lock hopper 620 from being damaged does not accumulate in the lock hopper 620. It is preferable to be configured not to open. As such a configuration, for example, when the motor-operated valve 660 detects the water level in the lock hopper 620 and / or the weight of the lock hopper 620 and reaches a water level or weight satisfying such conditions, the motor-operated valve An electronic control device (not shown) designed to open 660 may be further provided, but is not limited thereto. With such a configuration, the solid is supplied from the storage device 610 to the lock hopper 620 only after a necessary amount of water has accumulated in the lock hopper 620, and thus supplied to the lock hopper 620. The solid momentum is always absorbed by the water inside the lock hopper 620, and as a result, the lock hopper 620 can be more reliably prevented from being damaged.

By closing the motor-operated valve 660 after the solid has moved from the storage device 610 to the lock hopper 620, the lock hopper 620 becomes a pressurized sealed system containing solid and water. Next, by opening the motor-operated valve 655, the pressure is released from the pressure extraction path 650, and the pressure inside the lock hopper 620 is gradually reduced to normal pressure.
At this time, if it is taken into consideration that the pressure extraction path 650 is prevented from being clogged by the inflow of solids, the pressure is slowly reduced so that only the air in the lock hopper 620 is extracted from the pressure extraction path 650. It is preferable to go. When the solid flows into the pressure extraction path 650, the pressure extraction path 650 is extracted by extracting the solid flowing into the pressure extraction path 650 from the solid extraction path 657 having a filter (not shown) for trapping the solid. It is preferable to prevent clogging. The method for extracting the solid from the solid extraction path 657 is not particularly limited. For example, after closing both ends of the solid extraction path 657 connected to the pressure extraction path 650 as necessary, the solid is removed by replacing the filter. It may be extracted.

When the pressure in the lock hopper 620 returns to normal pressure, the motor-operated valve 670 is opened, so that the solid in the lock hopper 620 is installed in the direction of gravity from the lock hopper 620 to the opening 670 of the lock hopper 620 together with water. The discharged container 630 is discharged using gravity. That is, as shown in FIG. 1, the container 630 may be installed at a position where the solid and water dropped from the opening can be received.
Before discharging the solid and water from the lock hopper 620, the pressure of the lock hopper 620 is returned to the normal pressure, so that the solid and water are discharged from the lock hopper 620 that has been pressurized. , The momentum of the discharged matter can be moderately reduced, and as a result, the impact, noise, and scattering of the solid and water caused by the discharged solid and water hitting the container 630 can be reduced. It becomes.

  By doing so, the solid housed in a state of being pressurized in the housing device 610 is supplied to the lock hopper 620 at normal pressure, and further supplied from the lock hopper 620 to the container 630 installed outside thereof. can do. Subsequently, when the solid is stored in a state of being pressurized in the storage device 610 and the stored solid is supplied to the lock hopper 620 at normal pressure, the following can be performed.

When solid and water are discharged from the lock hopper 620, water is supplied from the water supply path 640 to the lock hopper 620 by opening the motor-operated valve 645. At this time, by leaving the electric valve 670 open, not only the lock hopper 620 but also the electric valve 670 can be washed with water.
Conventionally, the motor-operated valve 670 installed at the solid discharge port of the lock hopper 620 has a problem that solids are easily attached and easily clogged due to its structure of being thinner than the diameter of the lock hopper 620. In the solid supply system 600 according to the present embodiment, the lock hopper 620 includes the water supply passage 640, so that the motor-operated valve 670 can be easily cleaned simultaneously with the lock hopper 620. As a result, the motor-operated valve 670 is clogged with solids. Can be prevented.

  After the lock hopper 620 and the electric valve 670 are washed, the electric valve 670 is closed, so that water can be accumulated in the lock hopper 620. At this time, the pressure extraction path 650 can be washed with water overflowing from the pressure extraction path 650 by keeping the electric valve 655 open. At this time, the water discharged from the pressure discharge path 650 is water that has accumulated in the lock hopper 620 after being washed, and thus hardly contains solids. However, when the solid flows into the pressure discharge path 650, In order to prevent the extraction path 650 from being clogged with solids, it is preferable to extract the solid from the solid extraction path 657.

  Appropriate for moving solids from the storage device 610 to the lock hopper 620 by appropriately adjusting the supply of water from the water supply passage 640 and the discharge of water by the motorized valve 670 after washing the pressure extraction passage 650 A sufficient amount of water is again stored in the lock hopper 620. When an appropriate amount of water has accumulated, the motor-operated valves 645 and 655 are closed. Further, when the motor-operated valve 670 is opened to discharge water, the motor-operated valve 670 is also closed.

On the other hand, before washing | cleaning the above-mentioned lock hopper 620 grade | etc., The solid is accommodated in the state pressurized by the accommodating apparatus 610.
As a result, an appropriate amount of water exists in the lock hopper 620 in which all the electric valves 645, 655, 660, and 670 are closed under normal pressure, and the solid can be moved again from the pressurized container 610. It becomes a state.

In this way, in the solid supply system according to the present invention, the lock hopper includes the water supply passage, so that the solid is supplied from the pressurized storage device to the normal pressure lock hopper in which an appropriate amount of water is stored. The impact of the solid on the lock hopper by the accumulated water can be mitigated, so that the lock hopper can be prevented from being damaged during the movement of the solid. At this time, the amount of water in the lock hopper is set to an amount in which an air layer having a volume larger than that of the supplied solid remains in the lock hopper, so that the movement of the solid from the storage device to the lock hopper is further increased. It can be easily performed.
Furthermore, in the solid supply system according to the present invention, the lock hopper includes a water supply passage, so that the lock hopper itself, the motor operated valve provided in the solid discharge port of the lock hopper, and the pressure discharge passage can be easily and conveniently provided. Since it can wash | clean, it becomes possible to suppress that solid adheres to these and clogs.
In addition, in the solid supply system according to the present invention, the lock hopper includes a pressure extraction path, so that solid or water can be discharged outside the lock hopper after the pressure is extracted from the pressurized lock hopper. As a result, it is possible to mitigate the impact, noise, etc. that the discharged matter gives to the outside.

  Hereinafter, the solid supply system of the present invention will be described specifically by way of examples. These examples are for explaining the present invention, and do not limit the scope of the present invention.

In the present embodiment, the reaction residue generated in the reactor 120 is supplied to the container 630 using the solid supply system 1 shown in FIG.
The solid supply system 1 includes a pretreatment device 110, a reactor 120, a gas-liquid separator 130, a solid-liquid separator 140, a storage device 610, a lock hopper 620, and a container 630. Here, the storage device 610 is connected to the lower portion of the solid-liquid separator 140, the lock hopper 620 is connected to the lower portion of the storage device 610, and the container 630 is installed at the lower portion of the lock hopper 620. Has been.
The lock hopper 620 includes a water supply path 640, a pressure extraction path 650, and motorized valves 660 and 670. The water supply path 640 further includes an electric valve 645, and the pressure extraction path 650 further includes an electric valve 655 and a solid extraction path 657 including a filter (not shown).
In the initial state, the motor-operated valves 645, 650, 660, and 670 are all closed.

First, 97.6 parts by mass of water, 2 parts by mass of chicken manure, and 0.4 parts by mass of activated carbon having a particle size of 20 μm are added to the pretreatment apparatus 110, and after stirring and mixing, the conditions are 180 ° C. and 1.1 MPa. The slurry body of biomass was obtained by carrying out a hot-water process. Subsequently, the slurry body was supplied to the reactor 120 using a high-pressure pump. The slurry body in the reactor 120 was treated at a high temperature and a high pressure of 600 ° C. and 25 MPa to carry out a reaction with supercritical water.
The obtained reaction mixture was supplied to the gas-liquid separator 130 using a high-pressure pump. In the gas-liquid separator 130, the gas containing the fuel gas was taken out from the reaction mixture, and the remaining mixture of liquid and solid was supplied to the solid-liquid separator 140 using a high-pressure pump. The temperature and pressure of the solid-liquid separator 140 supplied with the mixture of liquid and solid were 600 ° C. and 29 MPa, respectively. In the solid-liquid separator 140, the liquid was extracted from the supplied mixture of liquid and solid, and the remaining solid was supplied to the storage device 610 using gravity. The solid supplied to the storage device 610 was cooled to 80 ° C. by exchanging heat with tap water. At this time, the pressure of the storage device 610 remained at 29 MPa.

Next, water was supplied from the water supply pipe 640 to the lock hopper 620 by opening the electric valves 645 and 655. The amount of water to be supplied was set to 20 times the volume of chicken manure charged into the pretreatment device 110. At this time, in the lock hopper 620, an air layer having a volume five times that of the chicken manure put into the pretreatment device 110 remained.
By closing the motor-operated valves 645 and 655 and then opening the motor-operated valve 660, the solid stored in the storage device 610 is supplied to the lock hopper 620 using the pressure difference and gravity in the storage device 610 and the lock hopper 620. . At this time, the air layer in the lock hopper 620 was compressed by pressure. However, since water was accumulated in the lock hopper 620, the solid collided with the bottom of the lock hopper 620, that is, the motor-operated valve 670 with a strong momentum. There was no.

  The motorized valve 660 was closed after the solid moved to the lock hopper 620. Subsequently, by slowly opening the electric valve 655, the air in the lock hopper 620 was slowly extracted from the pressure extraction passage 650, and the pressure inside the lock hopper 620 was gradually returned to normal pressure. At this time, since a slight inflow of solids from the lock hopper 620 to the pressure extraction path 650 was confirmed, the filter of the solid extraction path 657 was replaced after the pressure of the lock hopper 620 returned to normal pressure. The solid was removed from the solid extraction path 657.

  By opening the motor-operated valve 670 of the lock hopper 620 returned to the normal pressure, the solid and water in the lock hopper 620 were discharged to the container 630 using gravity. Since the pressure of the lock hopper 620 has returned to normal pressure, the momentum of the discharged solid and water is moderately weakened compared to the case where the solid is discharged from the lock hopper 620 that has been pressurized. As a result, when the discharged object collided with the container 630, impact, noise, and solid scattering hardly occurred.

After the solid and water were discharged from the lock hopper 620, water was supplied from the water supply path 640 to the lock hopper 620 by opening the motor-operated valve 645. At this time, since the motor-operated valve 670 is in an open state, not only the lock hopper 620 but also the motor-operated valve 670 can be washed with water by supplying water to the lock hopper 620, and these adherence is attached. The solid that had been washed out could be washed away.
Subsequently, water was stored in the washed lock hopper 620 by closing the motor-operated valve 670 while supplying water to the lock hopper 620. The accumulated water was discharged from the pressure extraction path 650 because the motor-operated valve 655 was open, and as a result, the pressure extraction path 650 could be washed. At this time, no inflow of solid into the pressure extraction passage 650 was confirmed.

  After washing the pressure relief passage 650, the motor-operated valve 670 is opened to discharge the water accumulated in the lock hopper 620, and the amount of water in the lock hopper 620 is 20 times the volume of chicken manure to be introduced into the pretreatment device 110. And when the volume of the air layer of the lock hopper 620 became five times the volume of the chicken manure thrown into the pretreatment apparatus 110, the motor operated valves 645, 655, and 670 were closed.

  As a result, an appropriate amount of water is present at normal pressure in the lock hopper 620 in which all the motor-operated valves 645, 655, 660, and 670 are closed, so that the biomass generated in the reactor 120 again. The reaction residue of the supercritical water was supplied to the container 630. After repeating this process 20 times in total, the state of the lock hopper 620 including the motor operated valve 670 was confirmed, and no damage was found.

1,600 Solid supply system 110 Pretreatment device 120 Reactor 130 Gas-liquid separator 140 Solid-liquid separator 610 Storage device 620 Lock hopper 630 Container 640 Water supply path 650 Pressure extraction path 645, 655, 660, 670 Motorized valve 657 Solid Extraction path

Claims (9)

A solid supply system for supplying solids from a storage device whose inside is pressurized to a lock hopper that is at normal pressure,
A storage device for storing the solid in a pressurized state;
A lock hopper connected in the gravitational direction of the storage device;
A valve for adjusting the movement of the solid at a connecting portion between the storage device and the lock hopper;
The lock hopper is a solid supply system including a water supply path for supplying water to the lock hopper.   The solid supply system according to claim 1, wherein the lock hopper further includes a pressure extraction path.   The solid supply system according to claim 1, wherein the valve is configured not to open unless a predetermined amount of water accumulates in the lock hopper.   The solid supply system according to claim 3, wherein the predetermined amount is an amount in which an air layer remains in the lock hopper.   The solid supply system according to claim 4, wherein a volume of the air layer is larger than a volume of the solid at normal pressure. A method of supplying a solid housed in the housing device from a housing device in a pressurized state to a normal pressure lock hopper connected in a gravitational direction of the housing device,
Supplying water to the lock hopper;
Supplying the solid from the storage device to the lock hopper having the supplied water. Reducing the internal pressure of the lock hopper supplied with the solid;
The solid supply method according to claim 6, further comprising a step of discharging the supplied solid to the outside of the lock hopper from the lock hopper with reduced internal pressure.   The solid supply method according to claim 6 or 7, wherein in the step of supplying water, water is supplied to the lock hopper so as to leave an air layer inside the lock hopper.   The solid supply method according to claim 8, wherein a volume of the air layer is larger than a volume of the solid stored in the storage device at normal pressure.

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