JP2003321686A - Method for continuously producing gas hydrate and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient method for producing a gas hydrate by which water is reacted with a hydrate-forming gas in a reaction vessel and the resultant gas hydrate can continuously and stably be taken out and to provide an apparatus therefor. <P>SOLUTION: The apparatus comprises the reaction vessel 1 having a water feed pipe 5 and a hydrate-forming gas introduction pipe 9, a rotating crushing apparatus 12 having crushing members 11 extending over the lower and upper sides of the liquid level and a forced takeout means 16 having a gas hydrate takeout port 17 connected to a prescribed height of the reaction vessel 1, keeping the internal pressure of the reaction vessel 1 and taking out the slurry gas hydrate to the outside of the reaction vessel 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous gas hydrate production method and apparatus for continuously producing a gas hydrate by reacting a hydrate-producing gas (for example, methane) with water. .

[0002]

2. Description of the Related Art In recent years, fuels for business and industrial use have been required to have low CO ₂ emission as a measure against global warming. Therefore, natural gas with low CO ₂ emission per unit combustion amount. Etc. are being used.

[0003] Natural gas is a gas containing ethane, propane and butane in the main component of methane by a few percent. When transporting or storing natural gas, the natural gas is liquefied natural at an extremely low temperature of -162 ° C or lower. It is transported or stored as gas (LNG). When using natural gas as a fuel, a liquefaction plant for liquefying natural gas, an LNG ship and a storage facility capable of transporting and storing natural gas at extremely low temperatures are required, and large-scale equipment cost, transportation cost and operation are required. There was a costly problem. For this reason, conventionally, it has been generally possible to use only for a large-scale collection site where a large amount of natural gas can be collected.

On the other hand, in addition to the large-scale natural gas sampling sites described above, there are many medium and small-scale natural gas sampling sites. At present, the natural gas in the small-scale natural gas collection area is not used.

Therefore, it has been considered to solidify a large amount of natural gas in an easily handled state, and one of them is gas hydrate.

The gas hydrate is a cage structure formed by weakly binding water molecules. For example, hydrocarbons such as methane, ethane, propane, butane, which are components of natural gas (hydrate forming gas), are confined in the cage structure. In the case of producing a gas hydrate, which is a sherbet-like solid compound, water at 0 to 10 ° C. is brought into contact with a hydrate-producing gas such as methane of 10 to 70 ata, and at this time, a heat of gas hydrate formation (98 kcal). Gas hydrate is produced by cooling to remove (/ kg). When the temperature of the gas hydrate rises due to the heat of formation, the generation efficiency drops significantly, while even if the temperature rises, the generation of gas hydrate can be secured if the pressure is high.

As described above, the gas hydrate can be manufactured at a relatively high temperature and a low pressure as compared with the liquefied natural gas method, so that the manufacturing equipment can be made small and inexpensive, and the gas hydrate can be used. Since the hydrate is stable as a solid, it is easy to handle for storage, transportation, etc. Therefore, it can be easily applied to the medium and small-scale natural gas collection sites as described above, and has not been used conventionally. It is possible to make effective use of natural gas from medium to small-scale natural gas collection sites.

Conventionally, in the production of gas hydrate,
Water is stored in the reaction vessel, and the hydrate-producing gas is supplied to the space above the liquid surface so that the hydrate-producing gas is brought into contact with the liquid surface.The hydrate-producing gas is supplied into the reaction vessel. In addition, there are a water spraying method in which water is sprayed from the upper part of the reaction vessel to make contact, and a bubbling method in which water is stored in the reaction vessel and hydrate-forming gas is supplied into the water to cause bubble contact. Although considered, the conventional gas hydrate generator using methane in the liquid surface contact method, which is the object of the present invention, will be described below.

FIG. 6 shows an example of this, and this apparatus supplies water to a pressure-resistant reaction container 50 through a water supply pipe 51 to maintain a predetermined level, and further, inside the reaction container 50. The hydrate is introduced into the upper space above the liquid surface by the hydrate-producing gas introduction pipe 52 to bring the methane and water into contact with each other on the liquid surface to cause a hydration reaction to produce a gas hydrate. . At this time, the supply of methane is adjusted so that the pressure in the reaction vessel 50 becomes 10 to 70 ata. A jacket-type cooling device 53 is provided outside the reaction container 50 to remove the heat of gas hydrate formation due to the hydration reaction. In addition to the jacket type, the cooling device 53 includes a reaction container 50.
There is also one in which a heat exchanger is inserted in the liquid to directly cool the liquid. Further, a stirring blade 55 rotated by an upper motor 54 is provided in the liquid in the reaction container 50 to stir the liquid.

An extraction pipe 57 having a gas hydrate outlet 56 at a position substantially at the liquid level is connected to the side surface of the reaction vessel 50 so that the gas hydrate formed on the liquid surface is taken out of the extraction pipe 57. It is taken out through the outside.

In order to manufacture a gas hydrate using the gas hydrate generator shown in FIG. 6, first, water is supplied to a predetermined water level through a water supply pipe 51 in a reaction vessel 50, and then a hydrate generation gas introduction pipe is used. Methane is introduced by 52 to adjust the inside of the reaction vessel 50 to a predetermined pressure of 10 to 70 ata. Further, the stirring blade 55 is rotated by the motor 54 to stir the liquid. When methane is introduced into the reaction container 50 containing water as described above, the hydration reaction is performed by the contact between water and methane, and a gas hydrate is produced. The heat of formation of gas hydrate due to this hydration reaction is removed by the cooling device 53. The gas hydrate generated on the liquid surface is taken out from the gas hydrate take-out port 56 by the take-out pipe 57.

As described above, when the gas hydrate is generated, water and the hydrate-producing gas are consumed, so that water is supplied by the water supply pipe 51 so that a predetermined water level is maintained, and a predetermined pressure is maintained. Methane is supplied through the hydrate production gas introduction pipe 52 so as to be held.

[0013]

However, the conventional gas hydrate generator shown in FIG. 6 has the following problems.

That is, since water and methane come into contact with each other on the liquid surface to generate a gas hydrate by a hydration reaction,
The gas hydrate layer 58 is formed so as to cover the liquid surface. Therefore, the gas hydrate layer 58 interferes with the contact between methane and water, and the gas hydrate production efficiency is significantly reduced.

Furthermore, since the gas hydrate layer 58 formed on the liquid surface does not move as described above, it is easy to form lumps, and the lumped gas hydrate cannot be taken out from the gas hydrate outlet 56. is there. Further, the gas hydrate layer 58 is difficult to move toward the gas hydrate outlet 56. Therefore, in order to solve this problem,
In the conventional apparatus of FIG. 6, a discharge blade 59 that is rotationally driven is provided in the vicinity of the gas hydrate outlet 56 in the reaction vessel 50 so that the gas hydrate is guided to the gas hydrate outlet 56. ing. However, the discharge vane 59 is connected to the gas hydrate outlet 56.
It is only possible to break or move the mass of gas hydrate in the immediate vicinity of, and the gas hydrate layer 58 formed on the entire liquid surface cannot be broken and efficiently directed to the gas hydrate outlet 56. There was a problem that a stable gas hydrate could not be taken out.

On the other hand, it is considered that the stirring blade 55 is provided at a position close to the liquid surface and is rotated at a high speed to drive the liquid surface so that the liquid surface is caught therein, thereby destroying the gas hydrate layer 58. In the method, gas hydrate having a low density is generated on the liquid surface due to the entrainment of bubbles, and the foamy gas hydrate has poor fluidity, so that it is more difficult to take out from the gas hydrate outlet 56. There is a problem.

In order to take out the gas hydrate through the take-out pipe 57, it is required to take out the gas hydrate while keeping the inside of the reaction vessel 50 at a predetermined pressure of 10 to 70 ata. An effective method for stably taking out the gas hydrate while keeping it is not proposed.

Therefore, in the conventional gas hydrate production apparatus in the liquid level contact system, it was difficult to produce the gas hydrate continuously, efficiently and stably.

The present invention has been made in view of the above-mentioned problems of the prior art, and continuously and stably stabilizes a gas hydrate produced by reacting water with a hydrate-producing gas in a reaction vessel. It is an object of the present invention to provide a gas hydrate continuous production method and apparatus capable of taking out gas hydrate with high efficiency and enabling production of gas hydrate with high efficiency.

[0020]

According to a first aspect of the present invention, water is supplied to a reaction container so as to maintain a predetermined level, and a hydrate product gas is supplied so that the inside of the reaction container is maintained within a predetermined pressure range. In a method of generating a gas hydrate by supplying and contacting at a predetermined cooling temperature, a gas hydrate film generated on a liquid surface is crushed to form a slurry gas hydrate, and the slurry gas hydrate is formed. The present invention relates to a continuous gas hydrate production method, characterized in that the gas is taken out of the reaction vessel by a forced take-out means capable of holding pressure.

The invention according to claim 2 is characterized in that the generation state of gas hydrate in the reaction vessel is monitored by the torque of a crushing device that rotates in the reaction vessel to control the generation. Item 1. The method for continuous production of gas hydrate according to Item 1.

According to a third aspect of the present invention, the generation condition of the gas hydrate in the reaction container is controlled by monitoring the concentration of the salt in the liquid and mixing the salt in water in the reaction container. The present invention relates to the method for continuously producing gas hydrate according to claim 1.

The invention according to claim 4 is characterized in that the slurry-like gas hydrate taken out by the forced take-out means is separated into water and gas hydrate. Method.

According to a fifth aspect of the present invention, there is provided a reaction container having a water supply pipe and a hydrate-producing gas introduction pipe, a crushing device having a crushing member extending above and below the liquid surface, and a reaction container. The gas hydrate take-out port is connected to a predetermined height of the gas and is equipped with a forced take-out means capable of taking out the slurry-like gas hydrate to the outside of the reaction vessel while holding the pressure inside the reaction vessel. The present invention relates to a hydrate continuous manufacturing apparatus.

According to a sixth aspect of the present invention, the forced ejection means is a screw pump.
The present invention relates to the continuous gas hydrate production apparatus.

The invention according to claim 7 relates to the gas hydrate continuous production apparatus according to claim 5, characterized in that the forcible take-out means is a snake pump.

The invention according to claim 8 relates to the gas hydrate continuous production apparatus according to claim 5, characterized in that the crushing device is provided with a stirring blade that rotates in the liquid. .

According to a ninth aspect of the invention, a torque detector for detecting the load of the crushing device is provided, and the hydrate-producing gas introducing pipe is provided so that the torque detected by the torque detector maintains a predetermined value. The apparatus for continuously producing gas hydrate according to claim 5, further comprising a controller for controlling the flow rate adjusting valve.

According to a tenth aspect of the present invention, a salt is mixed in the water in the reaction vessel, and a concentration detector for detecting the concentration of the salt in the water is provided, and the concentration detected by the concentration detector has a predetermined value. 6. The gas hydrate continuous production apparatus according to claim 5, further comprising a control device for controlling a flow rate control valve provided in the hydrate production gas introduction pipe so as to hold the hydrate production gas.
It is related to.

[0030] According to the invention of claim 11, in the end portion on the opposite side of the gas hydrate outlet in the forced outlet,
6. A continuous gas hydrate production apparatus according to claim 5, further comprising a solid-liquid separator for separating the slurry gas hydrate into water and gas hydrate.

According to the above means, it operates as follows.

Since the liquid surface portion in the reaction vessel is agitated by the crushing device, a water surface not covered by the gas hydrate always appears on the liquid surface, so that the hydrate-producing gas is always in contact with water. It is possible to produce gas hydrate with high efficiency.

Since the liquid surface portion is constantly stirred by the crushing device, the gas hydrate generated on the liquid surface is crushed by the crushing device, and therefore the liquid surface is fine particles crushed and has fluidity. A slurry-like gas hydrate having the following structure is formed. Therefore, since the slurry-like gas hydrate satisfactorily flows into the gas hydrate outlet and is taken out by the forced take-out means,
Succeeding continuous extraction will be performed stably.

Further, at this time, if the stirring blade provided in the liquid is rotated together with the crushing member, the temperature in the liquid can be kept uniform by the stirring by the stirring blade, so that the gas hydrate is produced. Can be stabilized.

Only the gas hydrate is obtained by introducing the slurry-like gas hydrate taken out by the forced take-out means to the solid-liquid separation device to separate water.

Further, the detected torque from the torque detector provided in the crushing device is input to the control device to determine the change in viscosity of the generated slurry, and the hydrate rate is determined by judging the gas hydrate generation state from the change in viscosity. Since the introduction amount of the produced gas is adjusted, the slurry-like gas hydrate can always be stably produced in a constant amount in the reaction vessel, and therefore, the removal of the gas hydrate by the forced removal means can be further performed. You will be able to do it stably and reliably.

Further, salts are mixed in advance with the water in the reaction vessel, and the change in the concentration of the salts in the liquid is detected to judge the gas hydrate formation state to adjust the amount of hydrate formation gas introduced. Therefore, the slurry-like gas hydrate can be constantly and stably produced in a fixed amount in the reaction vessel, and therefore the gas hydrate can be taken out more stably and surely by the forced take-out means. become.

As described above, by the formation of the slurry-like gas hydrate by the crushing device, the configuration for controlling the production by monitoring the production status of the gas hydrate in the reaction vessel, and the forced removal by the forced removal means, The production of gas hydrate can be carried out continuously, efficiently and stably.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the form example shown below, the case where methane is used as the hydrate-producing gas is described, but the hydrate-producing gas is not limited to methane,
Gas hydrates can also be produced using ethane, propane, butane, krypton, xenon and carbon dioxide.

FIG. 1 shows an example of the form of a gas hydrate continuous production apparatus for carrying out the present invention, in which 1 is a reaction vessel. A water supply pipe 5 having a water supply pump 2, a flow rate control valve 3, and a cooler 4 is connected to the lower portion of the reaction vessel 1. Further, a hydrate-producing gas introduction pipe 9 having a pressurizing device 6, a flow rate control valve 7 and a cooler 8 is connected to the upper part of the reaction vessel 1.

The reaction container 1 is provided with a crushing device 12 provided with a crushing member 11 which rotates a liquid surface and a liquid near the liquid surface at a required radius of rotation by a motor 10 provided above the reaction container 1.

As shown in FIGS. 2 and 3, the crushing device 12 has a connecting member 14 fixed to the lower end of the rotary shaft 13 of the motor 10 and extending laterally (left and right). The crushing members 11 extending vertically downward are fixed to both ends of the crushing member 11. The crushing member 11 may be formed in a blade shape by a plate, or may be a rod-shaped member. The crushing member 1
1 extends over the upper part and the lower part of the liquid surface in the reaction vessel 1, whereby the liquid surface and water close to the liquid surface can be stirred. In the example of FIGS. 2 and 3, the crushing member 11
Although the case where the crushing members 11 are provided at two positions in the diameter direction is shown, the number of the crushing members 11 to be installed can be arbitrarily selected.
When a plurality of crushing members 11 are provided, the connecting members 14 extending from the rotating shaft 13 may have the same length so as to rotate with the same turning radius.
The lengths may be set to different lengths so that they rotate with different turning radii.

FIG. 4 shows another example of the crushing apparatus. A stirring blade 15 rotating in the liquid of the reaction vessel 1 is attached to the rotary shaft 13 so that the crushing member 11 can be rotated together. I have to.

At a predetermined position of the upper and lower intermediate heights of the reaction container 1 in FIG. 1, there is provided a forced extraction means 16 for maintaining the internal pressure of the reaction container 1 so that the slurry gas hydrate can be taken out of the reaction container 1. Connected. Forced ejection means 1 in FIG.
6 is a screw pump 2 having a spiral blade shaft 20 rotated by a rotation drive device 19 inside an outer tube 18 whose gas hydrate outlet 17 is connected to the side surface of the reaction vessel 1.
The case of 1 is shown.

At the opposite end of the gas hydrate outlet 17 of the screw pump 21, the screen 2
2 is provided with a spiral blade shaft 23 inside and a slurry-like gas hydrate taken out by the screw pump 21 is sent axially rearward by the action of the spiral blade shaft 23 and water passing through the screen 22. The solid-liquid separator 24 is provided so as to separate the liquid. A system other than the illustrated example can be adopted for the solid-liquid separation device 24. Reference numeral 25 in FIG. 1 denotes a freezing tank that receives the gas hydrate separated by the solid-liquid separation device 24 and freezes it.
Further, the water separated by the solid-liquid separation device 24 can be returned to the water supply pipe 5 for use.

On the other hand, FIG. 5 shows another example of the forced extraction means 16, which is an extraction pipe which extends through the liquid from the lower part of the reaction vessel 1 and has a gas hydrate outlet 17 at the upper end opened to the liquid surface. 26 is provided, and a snake pump 27 is attached to the extraction pipe 26.
By attaching (Mono pump), reaction vessel 1
It shows a case where the slurry-like gas hydrate can be taken out of the reaction container 1 while maintaining the internal pressure. At the end of the snake pump 27 on the opposite side of the gas hydrate outlet 17, the solid-liquid separation device 2 similar to that described above is provided.
4 and a freezing tank 25 are provided. The direction of taking out the gas hydrate from the reaction vessel 1 by the forced take-out means 16 can be arbitrarily selected.

Coolers 1a, 16a, 2 are provided around the outer circumferences of the reaction vessel 1, the forced extraction means 16, and the solid-liquid separation device 24, respectively.
4a is provided, and the refrigerant from the refrigerating device 28 is cooled by the cooler 24a of the solid-liquid separation device 24 and the forced extraction means 16 is provided.
The cooling device 16a, the cooling device 1a of the reaction vessel 1, the cooling device 8 of the hydrate-producing gas introduction pipe 9 and the cooling device 4 of the water supply pipe 5 are returned to the refrigerating apparatus 28.

In FIG. 1, reference numeral 29 is a control device, and a liquid level signal 31 from a level meter 30 provided in the reaction container 1 is input to the control device 29. The pressure signal 33 from the pressure gauge 32 provided in the above is input, and the temperature signal 35 of the thermometer 34 is further input.

Further, the control device 29 includes the crushing member 1
The detected torque 37 from the torque detector 36 is input to detect the torque of the motor 10 that drives 1 at a constant rotation.

Then, in the control device 29, the liquid level signal 31 of the level meter 30 shows a predetermined value, and in the case of FIG. 1, the liquid level coincides with the lower side of the gas hydrate outlet 17 of the screw pump 21. So that it is at the position or slightly lower than that position, and in the case of FIG.
The flow rate control valve 3 of the water supply pipe 5 is automatically adjusted so as to be at a position corresponding to the gas hydrate outlet 17 at the upper end of 6 or a position slightly lower than that.

Further, the control device 29 automatically adjusts the flow rate control valve 7 of the hydrate-producing gas introduction pipe 9 so that the pressure signal 33 of the pressure gauge 32 shows a predetermined value of 10 to 70ata. ing. Further, the control device 29 is adapted to automatically adjust the operation of the refrigerating device 28 so that the temperature signal 35 of the thermometer 34 shows a predetermined value of 0 to 10 ° C. Further, the control device 29 controls the forced ejection means 16
The rotation drive device 19 is controlled.

Further, the control device 29 determines the gas hydrate generation state by obtaining the viscosity of the gas hydrate based on the detected torque 37 from the torque detector 36, and when the detected torque 37 is lower than a predetermined value, the hydrate. The flow control valve 7 is automatically adjusted so as to increase the amount of produced gas introduced,
Further, when the detected torque 37 is higher than a predetermined value, the flow rate control valve 7 is automatically adjusted so as to reduce the amount of hydrate-producing gas introduced.

The freezing tank 25 shown in FIG.
A cooler 38 for cooling at 0 ° C. to freeze the gas hydrate is provided.

The operation of the above embodiment will be described below.

Water is supplied to the reaction vessel 1 through the water supply pipe 5 shown in FIG. 1 to a predetermined water level, and then the motor 10 of the crushing device 12 is driven to rotate the crushing member 11 while the hydrate-producing gas introducing pipe 9 is supplied. Methane is supplied to the reaction vessel 1. At this time, the pressure and the temperature inside the reaction vessel 1 are adjusted to be predetermined values. Then, methane comes into contact with water on the liquid surface and produces gas hydrate.

At this time, since the liquid surface portion is agitated by the rotation of the crushing member 11, the water surface which is not covered by the gas hydrate always appears on the liquid surface, so that methane can always come into contact with water. , Gas hydrate will be produced with high efficiency.

Further, since the crushing member 11 is constantly rotating on the liquid surface portion, the gas hydrate generated on the liquid surface is always crushed by the crushing member 11, and thus the liquid surface is crushed. A slurry-like gas hydrate having fine particles and fluidity is formed.
At this time, the crushing member 11 may be rotated at a rotation speed low enough to crush the generated gas hydrate film, so that the problem of entraining bubbles in water due to the rotation of the crushing member 11 does not occur.

Further, as shown in FIG. 4, when the stirring blade 15 provided in the liquid is rotated together with the crushing member 11, the temperature in the liquid can be kept uniform by the stirring by the stirring blade 15. Therefore, the production of gas hydrate can be stabilized.

As described above, the slurry-like gas hydrate formed by the crushing device 12 can satisfactorily flow into the gas hydrate outlet 17, and therefore the screw pump 21 of FIG. 1 or the snake of FIG. The reaction container 1 is stably provided by the forced extraction means 16 by the pump 27.
Be taken out of the.

At this time, the controller 29 controls the torque detector 3
The detected torque 37 from 6 is input to obtain the change in the viscosity of the generated slurry, and the generation status of the gas hydrate is judged from the change in the viscosity. When the detected torque 37 is lower than a predetermined value, the generation of the gas hydrate is not detected. Flow control valve 7 to increase the amount of hydrate product gas when it is judged to be small
When the detected torque 37 is higher than a predetermined value, it is determined that the gas hydrate is generated in a large amount, and the flow rate control valve 7 is automatically adjusted so as to reduce the amount of the hydrate-produced gas introduced.

As a result, a slurry-like gas hydrate is always stably generated in a fixed amount in the reaction vessel 1, and the extraction of the gas hydrate by the forced extraction means 16 is further stable and ensured. You will be able to do it.

The slurry-like gas hydrate taken out by the forced take-out means 16 is introduced into the solid-liquid separation device 24 to separate water, and becomes only gas hydrate. Further, the dehydrated gas hydrate is added to the freezing tank 25.
When frozen in, it becomes a gas hydrate that does not decompose even in the atmosphere.

As described above, the formation of the slurry-like gas hydrate by the crushing device 12 and the construction for controlling the production by monitoring the production status of the gas hydrate in the reaction vessel 1 and the forced extraction means 16 By taking out
The production of gas hydrate can be performed continuously, efficiently and stably.

Further, in the apparatus of FIG. 1, the torque detector 3
A monitoring method different from the method of monitoring the generation status of the gas hydrate in the reaction container 1 by the detected torque 37 from 6 is shown at the same time.

In this monitoring method, salt (N
aCl) and the like are mixed in advance, and a concentration detector 39 for detecting the concentration of the salt in the liquid is provided.
The detected concentration 40 from the above is input to the control device 29. As the production of gas hydrate progresses in the reaction vessel 1, the water is reduced and the salts are concentrated and the concentration is increased. Therefore, the generation state of gas hydrate is judged from the change in the detected concentration 40, and the detected concentration 40 Is lower than a predetermined value, it is judged that the amount of gas hydrate produced is small, and the flow rate control valve 7 is automatically adjusted so as to increase the amount of hydrate-producing gas introduced. The flow rate control valve 7 is automatically adjusted so as to determine that the amount of hydrate generation is large and to reduce the amount of hydrate generation gas introduced. Also by this method, the slurry-like gas hydrate is always stably generated in a constant amount in the reaction vessel 1, and therefore the gas hydrate can be more stably and surely taken out by the forced take-out means 16. Like

[0066]

In the continuous gas hydrate production apparatus of the present invention, since the liquid level in the reaction vessel is agitated by the crushing device, the water level not covered by the gas hydrate is always present on the liquid level. Therefore, the hydrate-producing gas can always come into contact with water, which has the effect of efficiently producing the gas hydrate.

Since the liquid surface portion is constantly stirred by the crushing device, the gas hydrate film formed on the liquid surface will be crushed by the crushing device, and thus the crushed fine particles will flow on the liquid surface. A slurry-like gas hydrate having properties is formed. Therefore, since the slurry-like gas hydrate satisfactorily flows into the gas hydrate outlet and is taken out by the forced take-out means, there is an effect that continuous take-out can be stably performed.

Further, at this time, if the stirring blade provided in the liquid is rotated together with the crushing member, the temperature in the liquid can be kept uniform by the stirring by the stirring blade, so that the gas hydrate is produced. Has the effect of being stabilized.

By introducing the slurry-like gas hydrate taken out by the forced take-out means to the solid-liquid separation device to separate water, there is an effect that only gas hydrate can be obtained.

Further, the detected torque from the torque detector provided in the crushing device is input to the control device to determine the change in viscosity of the generated slurry, and the hydrate rate is determined by judging the gas hydrate generation state from the change in viscosity. Since the introduction amount of the produced gas is adjusted, the slurry-like gas hydrate can always be stably produced in a constant amount in the reaction vessel, and therefore, the removal of the gas hydrate by the forced removal means can be further performed. The effect is stable and reliable.

Further, salts are mixed in advance with the water in the reaction vessel, and the change in the concentration of the salts in the liquid is detected to judge the gas hydrate formation state to adjust the amount of hydrate formation gas introduced. Therefore, the slurry-like gas hydrate can be constantly and stably produced in a fixed amount in the reaction vessel, and therefore, the effect that the gas hydrate can be more stably and surely taken out by the forced take-out means. There is.

As described above, by the formation of the slurry-like gas hydrate by the crushing device, the structure for controlling the production by monitoring the production status of the gas hydrate in the reaction vessel, and the forced removal by the forced removal means, There is an effect that the production of gas hydrate can be performed continuously with high efficiency and stably.

[Brief description of drawings]

FIG. 1 is a cut side view showing an example of the form of a gas hydrate continuous production apparatus for carrying out the present invention.

FIG. 2 is a cut side view showing an example of a crushing device.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a cut side view showing another example of the crushing device.

FIG. 5 is an explanatory view showing an example of a forced ejection means different from that in FIG.

FIG. 6 is a schematic sectional side view showing an example of a conventional gas hydrate generation device.

[Explanation of symbols]

1 reaction vessel 5 water pipe 7 Flow control valve 9 Hydrate product gas introduction pipe 11 Crushing member 12 Crushing device 15 stirring blades 16 Forced removal means 17 Gas hydrate outlet 21 screw pump 24 Solid-liquid separator 26 Extraction pipe 27 Snake pump 29 Control device 36 Torque detector 37 Detection torque 39 Concentration detector 40 detection concentration

Front page continuation (51) Int.Cl. ⁷ identification code FI theme code (reference) C07C 7/20 C07C 9/04 9/04 C10L 3/00 A (72) Inventor Kenichi Tahara Shin Isogo-ku, Yokohama-shi, Kanagawa Nakaharacho No. 1 Ishi Kawashima Harima Heavy Industries Co., Ltd. Machinery & Plant Development Center (72) Inventor Kiichi Nunoue 1 Shin Shin Nakaharacho Isogo Ward, Kanagawa Prefecture Ishikawajima Harima Heavy Industries Co., Ltd. Machinery & Plant Development Center F Term (reference) 4G075 AA03 AA61 AA70 BD13 CA51 DA02 EA06 EB01 ED02 ED08 ED09 4H006 AA02 AA04 AC90 BC10 BC11 BD20 BD80 BD81 BD84 BE60

Claims (11)

[Claims] 1. A gas is produced by supplying water to a reaction vessel so as to maintain a predetermined level and supplying a hydrate-forming gas so that the inside of the reaction vessel is maintained at a predetermined pressure range and bringing them into contact with each other at a predetermined cooling temperature. In the method of generating hydrate, a gas hydrate in the form of slurry is crushed by crushing the gas hydrate film generated on the liquid surface,
A method for continuously producing gas hydrate, characterized in that the slurry-like gas hydrate is taken out of the reaction vessel by a forced take-out means capable of holding pressure. 2. The gas hydrate according to claim 1, wherein the generation condition of the gas hydrate in the reaction container is monitored and monitored by the torque of a crushing device which rotates in a constant manner in the reaction container. Continuous manufacturing method. 3. The production condition of the gas hydrate in the reaction vessel is controlled by mixing water in the reaction vessel with a salt and monitoring the concentration of the salt in the liquid to control the production. Item 2. A method for continuously producing gas hydrate according to Item 1. 4. The continuous gas hydrate production method according to claim 1, wherein the slurry-like gas hydrate taken out by the forced take-out means is separated into water and gas hydrate. 5. A reaction vessel provided with a water supply pipe and a hydrate-producing gas introduction pipe, a crushing device equipped with crushing members extending above and below the liquid surface, and a gas hydrate at a predetermined height of the reaction container. A continuous gas hydrate production apparatus comprising: a rate take-out port connected thereto; and a forced take-out means capable of holding a pressure in the reaction vessel and taking out a slurry-like gas hydrate to the outside of the reaction vessel. 6. The continuous gas hydrate production apparatus according to claim 5, wherein the forced extraction means is a screw pump. 7. The gas hydrate continuous production apparatus according to claim 5, wherein the forced extraction means is a snake pump. 8. The continuous gas hydrate production apparatus according to claim 5, wherein the crushing apparatus includes a stirring blade that rotates in the liquid. 9. A torque detector for detecting the load of the crushing device is provided, and a flow rate control valve provided in the hydrate-producing gas introduction pipe is controlled so that the torque detected by the torque detector maintains a predetermined value. The continuous gas hydrate production apparatus according to claim 5, further comprising a control device. 10. The hydrate is prepared by mixing a salt with water in the reaction vessel and providing a concentration detector for detecting the concentration of the salt in the water so that the detected concentration of the concentration detector holds a predetermined value. The continuous gas hydrate production apparatus according to claim 5, further comprising a control device that controls a flow rate control valve provided in the generated gas introduction pipe. 11. A solid-liquid separation device for separating slurry-like gas hydrate into water and gas hydrate is provided at an end portion of the forced extraction means opposite to the gas hydrate outlet. The continuous gas hydrate production apparatus according to claim 5.