JP2009235333A - Operation control apparatus of dehydrator in gas hydrate production plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation control apparatus of a dehydrator capable of stably operating a dehydration unit of the dehydrator in a gas hydrate production plant. <P>SOLUTION: When it is aimed at a shape of a bulk B of a GH slurry stayed on a drive part 11a of the dehydration unit 10, the shape becomes a shape proximity to a cone shape having an approximately downward projection. When dehydration treatment is smoothly performed, the shape is stabilized and a position of an apex part is maintained approximately constant. Therefore, pressure sensors 21a, 21b and an ultrasonic sensor 22 and permeation parts 23a, 23b are provided as detection means for detecting the position of the apex part of the bulk B. Any one or both of a feeding amount and a concentration of the GH slurry is adjusted according to the shape of the bulk B and variation of the position B<SB>0</SB>of the apex part, and the shape and the position B<SB>0</SB>of the apex part are maintained approximately constant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a low-concentration gas hydrate produced in a natural gas hydrate production plant that produces natural gas hydrate in a state suitable for transportation, storage, etc. The present invention relates to an operation control device for a dehydrator in a gas hydrate production plant for stably operating a dehydrator of a dehydrator that performs a dehydration treatment on a rate to produce a high-concentration gas hydrate slurry.

  Natural gas hydrate (NGH), the main component of which is methane, exists under the seabed at a depth of 500 m or less in frozen land zones such as Siberia, Canada, and Alaska and in the continental area. This NGH is a water-like solid substance or clathrate hydrate that is composed of gas molecules such as methane and water molecules and is stable under low temperature and high pressure, and as clean energy that emits less carbon dioxide and air pollutants. It is attracting attention.

  Natural gas, after being liquefied, is stored and used as energy, but its production and storage are performed at an extremely low temperature of -162 ° C. On the other hand, natural gas hydrate has the advantage that it exhibits stable properties without being decomposed at −20 ° C. and can be handled as a solid. Because of these characteristics, it is possible to effectively use gas resources in undeveloped small and medium gas fields for reasons such as profitability existing all over the world, or short distance from small gas fields, small-scale transportation. Natural gas hydrate method (NGH method) can be utilized in the case of.

  In the NGH system, NGH suitable for transportation and storage is generated at NGH shipping bases such as small and medium gas fields, and transported to the desired NGH receiving base by transport ships and vehicles, etc., and the transported NGH is stored at the NGH receiving base. If necessary, it will be used as an energy source by the NGH gasifier. FIG. 4 is a schematic block diagram illustrating an example of the configuration of a gas hydrate generation plant used in the NGH shipping base. The mined raw material gas is sufficiently mixed with water and hydrated in the generator 1 which is a high-pressure reaction vessel, and a low concentration gas hydrate (GH) slurry is generated. The produced GH slurry is supplied to the dehydrator 3 by the feed pump 2 to produce a dehydrated high-concentration GH slurry. At this time, the dehydrator 3 is supplied to the lowermost part of the dehydrator 3. The supplied GH slurry is dehydrated while gradually raising the dehydrator 3 and taken out from the upper end of the dehydrator 3. The taken out gas hydrate is taken out as GH powder that has been dehydrated and powdered. This GH powder is supplied to the pellet molding machine 4 and granulated to form GH pellets having a size suitable for transportation and storage. Next, after being cooled by the cooler 5 to a temperature at which it does not decompose even under normal pressure, it is supplied to the decompressor 6. That is, from the generator 1 to the cooler 5, processing is performed under normal temperature and high pressure, and the cooler 5 and the depressurization device 6 are processed to a temperature that does not decompose even under normal pressure. Thereafter, the generated GH pellets are fed to a storage tank and stored.

  FIG. 3 shows processing steps of the generator 1 and the dehydrator 3, and the raw material gas G and water W are supplied to the generator 1 in the reaction tank 1 a of the generator 1. The supplied raw material gas G and water W are stirred by the stirring device 1b, and the raw material gas G and water W react to generate low concentration GH. The unreacted source gas G is recovered from the upper part of the reaction tank 1a and supplied again from the bottom of the reaction tank 1a by the blower 1c. The generated GH slurry is fed together with unreacted water to the bottom of the dehydrator 3 by the feed pump 2. The unreacted water is dehydrated from the supplied GH slurry while ascending the dehydrator 3, and is fed from the upper part of the dehydrator 3 to the pellet molding machine 4 in the next step by a feeding device 3 c such as a screw feeder. The The dehydrator 3 has a double structure of an inner cylinder 3a and an outer cylinder 3b that accommodates the inner cylinder 3a. The GH slurry is supplied to the inner cylinder 3a, and dehydration from the GH slurry is conducted in the outer cylinder 3b. leak. The effluent water that has flowed out of the outer cylinder 3b is returned to the generator 1 by the recovery pump 3d and used for the reaction with the raw material gas G.

  For example, Patent Document 1 discloses gas hydrate dehydration provided with a vertical moving bed type dehydrator that gravity dehydrates water adhering to gas hydrate in order to smoothly carry out dehydrated GH slurry from the dehydrator 3. The dehydrator is a first tower body erected substantially vertically, connected to an upper part of the first tower body, and has a plurality of fine through holes, and the drainer section. And a second tower connected to the upper portion of the draining section, and the gas hydrate supplied from the bottom of the first tower and passing through the dehydrating section is conveyed upward. A conveying means is provided, and the gas hydrate in the dehydrator is conveyed to the unloader disposed above the dehydrator by the conveying means. A screw conveyor is used for the unloader and the unloading means.

JP2007-224116A

  In the dehydrator 3, moisture is removed as the supplied GH slurry rises. At the bottom of the dehydrator 3, unreacted water and GH slurry accompanied with the unreacted water are mixed, and a drive unit in which the GH slurry suspended with respect to the unreacted water stays is formed at the upper part. In the upper part of the driving part, there is a drainage part in which a large number of through holes are formed in the wall surface of the inner cylinder 3a, and the unreacted water flows out from the large number of through holes to the outer cylinder 3b. The GH slurry that has passed through this drainage part is in a state where the concentration is high, but it is still in a state with attached water. The accompanying attached water is removed by raising the GH slurry to a level higher than the water rise limit due to capillary action. For this reason, the dewatering part which becomes the height beyond the rise limit of the water by this capillary phenomenon is formed in the upper part of the drainage part. In this case, there is a dehydrator in which dehydration is performed by a pressurization method that lowers the rising limit of water by pressurization because the processing time becomes longer in the so-called gravity method dehydration process using gravity. .

  In the pressurization-type dehydrator, for example, when the supply of GH slurry to the dehydrator becomes unstable, the dehydration process of the GH slurry also becomes unstable. As described above, a drainage part is provided in the middle of the inner cylinder 3a. Since this drainage part is due to a large number of through holes formed in the wall of the inner cylinder 3a, the wall surface of the dehydrator The drainage from the GH slurry on the side is promoted, and the dehydration from the GH slurry in the center is delayed. In particular, when the dehydration process becomes unstable, the drainage from the GH slurry in the central part of the dehydrator may stagnate even though the drainage from the drainage unit is continued. For this reason, GH slurry stays in the central part of the dehydrator, drainage from the GH slurry near the wall surface is promoted exclusively, and the GH slurry does not exist on the wall surface portion of the drainage part. That is, the inner and outer sides of the inner cylinder 3a communicate with each other through the through hole of the drainage portion. In this case, in particular, the pressure applied to the dehydrator by the pressurization system will be released from the through hole of the drainage part, so the instability of the dehydration process will be further accelerated, and the dehydrator will be You will have to stop.

  By the way, when the dehydration process is stably performed, since the GH slurry is sequentially processed, the staying state of the GH slurry is constant, and the nodules of the GH slurry are contained in the inner cylinder 3a in the drive unit. It is known that the shape approximates a downwardly convex cone shape, and the top thereof is localized at a substantially constant height in the inner cylinder 3a.

  Therefore, the present invention provides a dehydrator operation control device in a gas hydrate generation plant that operates a dehydrator so that dehydration processing in the dehydrator can be stably performed based on the behavior of the GH slurry in the drive unit. The purpose is to do.

  As a technical means for achieving the above object, an operation control device of a dehydrator in a gas hydrate production plant according to the present invention is a cylinder for dehydrating from a gas hydrate slurry produced in a gas hydrate production process. In an operation control device for a dehydrator comprising a container having a shape, a drive in which the gas hydrate slurry stays in a lower part of a drainage portion where unreacted water accompanying the gas hydrate slurry supplied to the dehydrator is discharged A detection means for detecting the shape of the staying gas hydrate slurry in the section and a specific position of the nodule is provided, and the supply amount of the gas hydrate slurry supplied to the dehydrator based on the detection result by the detection means Alternatively, one or both of the concentrations are changed.

  When the dehydrator is in a stable and steady state, the behavior of the GH slurry in the drive unit hardly changes. In this drive unit, as described above, the GH slurry nodules are formed in a shape approximating a downwardly convex conical shape. Therefore, the detecting unit detects a specific position such as the shape of the nodules and the top. If there is a change in this shape or position, the operating state of the dehydrator has transitioned from the steady state. For example, when the position of the top portion is lowered, the dehydration process in the dehydration unit is delayed, and the supply amount of the GH slurry is reduced or the concentration of the supplied GH slurry is lowered. On the other hand, when the position of the top portion is raised, the GH slurry is excessively dehydrated, and the supply amount of the GH slurry is increased or the concentration of the supplied GH slurry is increased. Thereby, it adjusts so that the position of the said top part may be in the state at the time of steady operation.

  Moreover, the operation control apparatus of the dehydrator in the gas hydrate production plant according to the invention of claim 2 detects the pressure difference between the drive unit and the drainage unit, and detects the fluctuation of the differential pressure. It is a detection means.

  The change in the pressure difference between the drive unit and the drainage unit is detected by the pressure detection means, and when the pressure difference increases, the top of the GH slurry nodule is lowered, so the amount of GH slurry supplied is reduced. Or reduce the concentration of the GH slurry. When the differential pressure decreases, the supply amount of GH slurry is increased and the concentration of GH slurry is increased.

  According to a third aspect of the present invention, the dehydrator operation control device in the gas hydrate production plant is configured to set the distance of the detection means from a predetermined portion of the dehydrator to a predetermined position of the staying gas hydrate slurry. It is a position detecting means for measuring.

  For example, a distance measuring means for measuring the distance from the bottom of the dehydrator to the top of the GH slurry nodule is provided as the position detecting means. As the distance measuring means, for example, an ultrasonic sensor or the like can be used. That is, when the distance measurement data is smaller than that during steady operation, the top portion is lowered, and when the distance measurement data is large, it is raised, and either the supply amount or the concentration of the GH slurry is set. Or adjust both.

  In the dehydrator operation control apparatus in the gas hydrate production plant according to the invention of claim 4, the detection means visually recognizes the vicinity of the end portion of the retained gas hydrate slurry inside the dehydrator. It is characterized by the permeation detecting means formed in the dehydrator so as to be able to.

  In other words, if the dehydrator is provided with a transmission part such as a monitoring glass window as a permeation detection means, and the behavior of the GH slurry nodules in the drive part in the dehydrator is observed from this glass window, its shape, top, etc. The position can be grasped, and the supply amount or concentration of the GH slurry is adjusted according to the height.

  The observation can be performed visually by an operator, or can be performed using an image captured by a camera and displayed on a monitor installed in a management room or the like. Furthermore, the behavior can be grasped by performing image processing on the captured video.

  According to a fifth aspect of the present invention, the dehydrator operation control device in the gas hydrate production plant adjusts the supply amount of the gas hydrate slurry, and discharges a feed pump that supplies the gas hydrate slurry to the dehydrator. It is characterized by being performed by changing the amount.

  The supply amount of GH slurry is changed by changing the discharge amount of the feed pump that supplies the GH slurry to the dehydrator.

  The operation control apparatus for a dehydrator in a gas hydrate production plant according to the invention of claim 6 performs the concentration adjustment of the gas hydrate slurry by changing the production conditions in the gas hydrate generator. It is characterized by.

  Lowering the treatment temperature in the gas hydrate generator increases the degree of supercooling and increases the amount of production, resulting in a gas hydrate with a high concentration, and raising the treatment temperature produces a gas hydrate with a low concentration. Is done. Therefore, what is necessary is just to change the process temperature of a generator according to the behavior of the GH slurry in a drive part.

  Further, the operation control device of the dehydrator in the gas hydrate production plant according to the invention of claim 7 introduces the effluent water flowing out from the drainage part to the inlet side of the circulation pump, and the discharge side of the circulation pump is connected to the discharge side of the circulation pump. Connect to the discharge side of the feed pump that supplies the gas hydrate slurry to the dehydrator, mix the effluent water with the gas hydrate slurry, supply it again to the dehydrator, and adjust the mixing amount of this effluent water Thus, the supply amount of the gas hydrate slurry is adjusted.

  Since the unreacted water accompanying the GH slurry in the dehydrator flows out from the drainage section, the effluent water is returned to the discharge side of the feed pump and circulated. By adjusting the amount of effluent water, the flow rate of GH slurry supplied to the dehydrator is adjusted, so the amount of supply to the discharge side of the feed pump is adjusted according to the behavior of the GH slurry aggregate in the drive unit. adjust. It is also possible to configure a circulation path to be supplied to the dehydrator by connecting to the discharge side of the feed pump 2 in the middle of the discharge side of the recovery pump 3d described above.

  According to the operation control device of the dehydrator in the gas hydrate production plant according to the present invention, the operation state of the dehydrator is changed by changing the supply amount or the concentration of the GH slurry according to the behavior of the GH slurry in the driving unit. Therefore, the operation of the dehydrator can be stabilized.

  The dehydrator operation control apparatus in the gas hydrate production plant according to the present invention will be specifically described below based on the preferred embodiments shown in the drawings.

  FIG. 1 is a diagram for explaining a process by a dehydrator 10 provided with an operation control apparatus according to the present invention and the generator 1 that generates a low-concentration GH slurry to be supplied to the dehydrator 10. The GH slurry generated by the generator 1 is supplied to the dehydrator 10 by the feed pump 2 through the feed pipe 2a.

  The dehydrator 10 has a double structure in which an inner cylinder 10a is accommodated in an outer cylinder 10b. The dehydration process in the dehydrator 10 needs to be performed under a high pressure at which the GH slurry is not decomposed, and the inner cylinder 10a is opened at the drainage portion as will be described later. No pressure resistance is required for 10a, and the outer cylinder 10b is a pressure vessel. The feed pipe 2a is connected to the bottom of the inner cylinder 10a, and the GH slurry is supplied to the bottom of the inner cylinder 10a. It is also possible to provide a structure in which an outer cylinder is partially provided so as to surround the drainage portion and the inner cylinder 10a is used as a pressure vessel.

  FIG. 2 is a diagram for explaining the outline of the structure of the dehydrator 10 and shows the state of the supplied GH slurry S in the dehydrator 10. The GH slurry S supplied to the dehydrator 10 rises in the inner cylinder 10a and reaches the drainage part 11b. The drainage part 11b is a part in which a large number of through holes are formed in the wall of the inner cylinder 10a, and unreacted water accompanied by the GH slurry S is discharged from the drainage part 11b to the outside of the inner cylinder 10a. Will be. Since the inner cylinder 10a is accommodated in the outer cylinder 10b, the unreacted water flowing out from the drainage part 11b flows into the outer cylinder 10b. A circulation pump 12 is connected to the bottom of the outer cylinder 10b via a recovery pipe 12a. A discharge pipe 12b of the circulation pump 12 is connected to the feed pipe 2a via a circulation valve 13. Further, the discharge pipe 12 b is branched on the way to the circulation valve 13, and the branch pipe 12 c is connected to the generator 1. The effluent water that has flowed out of the drainage part 11b into the outer cylinder 10b is returned to the generator 1 from the branch pipe 12c by the circulation pump 12. Further, the effluent water that has passed through the circulation valve 13 is supplied to the inner cylinder 10a through the feed pipe 2a.

  Since the unreacted water is discharged in the drainage part 11b, the GH slurry S stays in the part facing the drainage part 11b, and on the other hand, the GH slurry S is sequentially supplied from below, so this stayed. The density of the GH slurry S increases and becomes a nodule B and extends downward. For this reason, as shown in FIG. 1, the baby boom B of the GH slurry S has an outer shape approximating a conical shape that protrudes downward. The portion where the baby boom B exists becomes the drive portion 11a, and below this, the slurry portion 11d in which the GH slurry S rises is formed. Further, a dewatering portion 11c is formed above the drainage portion 11b by a layer formed of the GH slurry S from which unreacted water has been removed. In this dewatering part 11c, the adhering water accompanying the rising GH slurry S is separated and removed from the GH slurry S due to the rise limit of capillary action, and the concentration is increased to produce GH slurry S or GH powder. Is done. That is, in the dehydrator 10, the concentration of the GH slurry S gradually increases toward the top.

When the dehydration process in the dehydration unit 11c is normally performed, the dehydrated GH slurry S rises, and the raised GH slurry S or GH powder is sequentially fed to the next step. The conical shape of the nodule B is maintained in a substantially constant state, and its top position B ₀ is at a substantially constant height.

The inner cylinder 10a is provided with pressure sensors 21a and 21b as pressure detecting means on the inner cylinder 10a as detecting means according to the first embodiment for detecting the shape of the baby boom B. These pressure sensors detect the differential pressure between the internal pressure in the driving section 11a of the inner cylinder 10a and the internal pressure in the drainage section 11c. If the differential pressure is increased, higher internal pressure of the lower the top position B ₀ the drive unit 11a volume of Nodules B occupying the driving portion 11a is increased, is smoothly dehydration process in the dewatering part 11c It shows a state in which dehydration is not performed. On the other hand, when the differential pressure is small, the top position B ₀ of the baby boom B is high, indicating that the dehydration process is being performed in an excessive state. Therefore, the operation of the dehydrator 10 is controlled based on the detection result. The operation control of the dehydrator 10 is performed by adjusting one or both of the supply amount and the concentration of the GH slurry S supplied to the dehydrator 10.

  In order to adjust the supply amount of the GH slurry S to the dehydrator 10, the discharge amount of the feed pump 2 is changed. When the size of the baby boom B is reduced, the dehydration process is in an excessive state, so the supply amount of the GH slurry S needs to be increased, and the discharge amount of the feed pump 2 is increased. On the other hand, when the size of the baby boom B is increased, the dehydration process is in a delayed state, and the discharge amount of the feed pump 2 is decreased to decrease the supply amount of the GH slurry S to the dehydrator 10.

  Moreover, in order to adjust the density | concentration of the GH slurry S supplied to the dehydrator 10, it is by changing the operating condition of the generator 1 in a previous process. In the generator 1, the raw material gas and the cooling water for reaction are mixed and stirred. At this time, when the temperature of the cooling water is lowered, the reaction between the raw material gas and the cooling water is promoted to increase the concentration of the GH slurry S, and when the temperature of the cooling water is increased, the concentration of the GH slurry S is decreased. Become. Alternatively, the concentration of the GH slurry S can be adjusted by changing the supply amount of the raw material gas and the supply amount of the cooling water. That is, when the baby boom B becomes larger, the GH slurry S having a low concentration is supplied to reduce the load of the dehydration process of the dehydrator 10 to speed up the dewatering process, and when the baby boom B becomes smaller Is supplied with a high-concentration GH slurry S to increase the amount of dehydration.

  Further, the supply amount of the GH slurry S to the dehydrator can be adjusted by adjusting the supply amount of the recovered water passing through the circulation pump 12 to the feed pipe 2a. That is, when the baby boom B becomes larger, the supply amount to the feeding pipe 2a is increased, and the supply amount is increased by diluting the GH slurry S with the effluent water, and when the baby boom B becomes smaller, the supply amount is increased. The supply amount of the effluent water to the feed pipe 2a is reduced so that the GH slurry S is supplied to the dehydrator 10 without being diluted. The supply amount of the outflow water feed pipe 2a can be performed by adjusting the opening degree of the circulation valve 13.

  Further, as shown in FIG. 1, as an operation control device for a dehydrator according to a second embodiment of the present invention, an ultrasonic sensor 22 is provided as a position detecting means on the bottom surface of the inner cylinder 10a, and the distance to the baby boom B is measured. By doing so, the size of the baby boom B can be detected, and the position of the GH slurry S in the drive unit 11a can also be detected. In this case, it is preferable to install a plurality of ultrasonic sensors 22 and to estimate the shape of the baby boom B by estimating the shape of the baby boom B from the distance measurement data.

  Also in the dehydrator operation control apparatus according to the second embodiment, the supply amount of the GH slurry S as described above according to the size of the baby boom B based on the distance measurement data detected by the ultrasonic sensor 22. By adjusting either or both of the concentration and the concentration, the operation state of the dehydrator can be stabilized.

  Further, as shown in FIG. 1, as an operation control device for a dehydrator according to a third embodiment of the present invention, each wall body of the inner cylinder 10a and the outer cylinder 10b is provided with permeability as a transmission detecting means. In the drive unit 11a of the GH slurry S, by attaching the transmission parts 23a and 23b made of a plate material so that the inside of the inner cylinder 10a can be visually recognized from the outside of the dehydrator 10, the actual behavior of the baby boom B is observed. The position can also be detected. In this case, the transmission parts 23a and 23b are provided at a position where the lower part of the baby boom B in a stable operation state can be put into the field of view. In addition, it is preferable that the inner cylinder 10a and the outer cylinder 10b are disposed at a plurality of locations on the wall body, because it is possible to obtain daylighting. Further, if the installation heights are different, the baby boom B can be confirmed. It is preferable because the height range is large. For the transmission parts 23a and 23b, for example, a glass plate or a transparent reinforced plastic or the like having pressure resistance is used.

  In addition, a photographing device such as a CCD camera is arranged facing the transmission parts 23a and 23b, and the state of the baby boom B is always photographed, and the image is monitored, for example, in the management room of the gas hydrate production plant. It can also be displayed on the device and the displayed video can be observed. Furthermore, by performing image processing based on the captured video and constantly comparing the shape of the baby boom B, it is also possible to grasp the change in the shape of the baby boom B.

  Also in the operation control device of the dehydrator according to the third embodiment, the supply amount and the concentration of the GH slurry S supplied to the dehydrator 10 according to the size of the baby boom B and the position of the GH slurry S in the drive unit 11a. By adjusting one or both, the operation state of the dehydrator can be stabilized.

  According to the operation control device of the dehydrator in the gas hydrate generation plant according to the present invention, the operation state of the dehydrator can be stabilized, which contributes to the continuous operation of the gas hydrate generation plant without any trouble.

It is a figure explaining the structure of the operation control apparatus of the dehydrator in the gas hydrate production | generation plant which concerns on this invention, and has shown the process by the generator and dehydrator of a gas hydrate production | generation plant. It is sectional drawing explaining the general | schematic structure of the dehydrator operation-controlled by the operation control apparatus which concerns on this invention. It is a schematic block diagram explaining the production | generation process of the gas hydrate in a generator, and the dehydration process in a dehydrator. It is a schematic block diagram explaining an example of a structure of a gas hydrate production | generation plant.

Explanation of symbols

1 generator 2 feed pump
2a Feed pipe
10 Dehydrator
10a inner cylinder
10b outer cylinder
11a Drive unit
11b Drainage section
11c Dehydration part
11d slurry section
12 Circulation pump
12a Recovery tube
12b Discharge pipe
13 Circulation valve
22 Ultrasonic sensor (ranging means)
23a, 23b Transmission part (transmission detection means)
B baby boom

Claims (7)

In the operation control device of the dehydrator comprising a cylindrical container for dehydrating from the gas hydrate slurry produced in the gas hydrate manufacturing process,
The shape of the conglomerate of the retained gas hydrate slurry in the drive unit where the gas hydrate slurry stays at the lower part of the drainage part where unreacted water accompanying the gas hydrate slurry supplied to the dehydrator is discharged. A detecting means for detecting a specific position of the baby boom,
An operation control device for a dehydrator in a gas hydrate production plant, wherein either or both of the supply amount and the concentration of the gas hydrate slurry supplied to the dehydrator are changed based on a detection result by the detection means. .   2. The dehydrator in the gas hydrate production plant according to claim 1, wherein the detection unit is a pressure detection unit that detects a pressure difference between the drive unit and the drainage unit and detects a variation in the differential pressure. Operation control device.   2. The gas hydrate production plant according to claim 1, wherein the detection unit is a position detection unit that measures a distance from a predetermined portion of the dehydrator to a predetermined position of the staying gas hydrate slurry. Operation control device for dehydrator.   The detection means is a permeation detection means formed in the dehydrator so that the inside of the dehydrator and the vicinity of the end of the staying gas hydrate slurry can be visually recognized. The operation control apparatus of the dehydrator in the gas hydrate production | generation plant of description.   The supply amount of the gas hydrate slurry is adjusted by changing a discharge amount of a feed pump that supplies the gas hydrate slurry to the dehydrator. The operation control apparatus of the dehydrator in the gas hydrate production | generation plant of description.   The gas hydrate production plant according to any one of claims 1 to 4, wherein the concentration of the gas hydrate slurry is adjusted by changing a production condition in a gas hydrate generator. Operation control device for dehydrator.   The effluent water flowing out from the drainage section is introduced to the inlet side of a circulation pump, and the discharge side of the circulation pump is connected to the discharge side of a feed pump that supplies gas hydrate slurry to the dehydrator, 2. The supply amount of the gas hydrate slurry is adjusted by mixing water into the gas hydrate slurry and supplying the mixture again to the dehydrator, and adjusting the mixing amount of the effluent water. The operation control apparatus of the dehydrator in the gas hydrate production | generation plant in any one of 4.

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