JP2003041272A - Method and apparatus for forming gas hydrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable discharging of the formed gas hydrate without discontinuing the formation step to improve its productivity. SOLUTION: In the method for forming a gas hydrate by reacting a stock gas with water in a reaction vessel 1, the reaction vessel 1 is provided with an opening 5a of a withdrawal opening for a gas hydrate, and the formation of the gas hydrate is conducted by setting the liquid level of an aqueous phase L to be formed in the reaction vessel 1 at a position lower than the opening 5a, and when the gas hydrate accumulates on the liquid level of the aqueous phase L, the liquid level is raised to discharge the gas hydrate floating on the aqueous phase L while continuing the above formation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for efficiently reacting natural gas with water to form a hydrate and increasing its production efficiency.

[0002]

2. Description of the Related Art At present, as a method of storing and transporting natural gas containing hydrocarbons such as methane as a main component, natural gas is mined from a gas field and then cooled to a liquefaction temperature to obtain liquefied natural gas (LNG). Generally, the method of storing and transporting in a stored state. However, for example, in the case of methane, which is the main component of liquefied natural gas, cryogenic conditions such as -162 ° C are necessary for liquefying, and in order to perform storage and transportation while maintaining such conditions, a dedicated storage device And LNG
Special transportation means such as a transportation ship is required. Since the manufacturing, maintenance and management of such devices require a very high cost, a low-cost storage / transportation method that replaces the above method has been earnestly studied.

As a result of these studies, a method has been found in which natural gas is hydrated to produce a solid-state hydrate (hereinafter referred to as "natural gas hydrate"), which is stored and transported in this solid state. In recent years, it has been particularly promising. This method does not require cryogenic conditions such as when handling LNG, and since it is a solid, its handling is relatively easy. Therefore, an existing refrigeration system or a slightly modified version of an existing container ship can be used as a storage device or a transportation means, respectively, and therefore, it is expected that the cost can be significantly reduced.

The natural gas hydrate is a kind of clathrate compound, which is a three-dimensional cage clathrate lattice formed by a plurality of water molecules (H ₂ O). Inside, the molecules that make up each component of natural gas, namely methane (CH ₄ ), ethane (C ₂ H ₆ ),
It has a crystal structure in which propane (C ₃ H ₈ ) or the like is included and clathrated. The intermolecular distance between the natural gas constituent molecules clathrated by the clathrate is shorter than the intermolecular distance in the gas cylinder when the natural gas is charged at a high pressure. This means that natural gas can produce a tightly packed solid, for example under conditions in which a hydrate of methane can be stably present, i.e. -30 ° C at atmospheric pressure (1 kg / cm
^{In 2} ), the volume can be about 1/190 compared with the gas state. As described above, natural gas hydrate can be produced under temperature and pressure conditions that are relatively easy to obtain, and can be stably stored.

In this method, the natural gas produced from the gas field is carbon dioxide (C
O ₂ ) and hydrogen sulfide (H ₂ S) and other acidic gases are removed, and the mixture is temporarily stored in the gas storage section in a low temperature and high pressure state and then hydrated in the production process. This natural gas hydrate is in the form of a slurry in which water is mixed, and in the subsequent dehydration step, the unreacted water that is mixed is removed, and further sealed in a container such as a container through a cooling step and a depressurizing step,
It is stored in the storage device in a state of being adjusted to a predetermined temperature and pressure.

At the time of transportation, the container is loaded as it is on a transportation means such as a container ship and transported to a destination. After landing at the destination, the natural gas hydrate is returned to the state of natural gas through a decomposition process and sent to each supply place.

[0007]

By the way, in the above-mentioned conventional processes from the production of natural gas hydrate to the transportation, when a certain amount of natural gas hydrate is produced, the production process is interrupted and the produced natural gas hydrate is produced. A so-called batch operation in which the gas hydrate is taken out and then the production process is restarted has been studied, but this method has a problem that it is difficult to improve productivity because the production process is interrupted.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the productivity by allowing the generated gas hydrate to be discharged without interrupting the generation process.

[0009]

In the present invention, the following means are adopted to solve the above problems. That is, the method for producing a gas hydrate according to claim 1 of the present invention is the method for producing a gas hydrate in which a raw material gas and water are reacted inside a reaction vessel to produce a gas hydrate. An outlet for the gas hydrate is provided, and the liquid level of the aqueous phase formed inside the reaction vessel is set lower than the outlet to perform generation, and the gas hydrate is added to the liquid surface of the aqueous phase. When the water is accumulated, the liquid level is raised while continuing the generation, and the gas hydrate floating in the water phase is discharged through the outlet.

A method for producing gas hydrate according to a second aspect is the method for producing a gas hydrate according to the first aspect, in which water contained in the gas hydrate discharged from the outlet is separated and the water is removed. Is also introduced into the reaction vessel so as to be used as a raw material.

A method for producing gas hydrate according to a third aspect is the method for producing gas hydrate according to the first or second aspect, wherein stirring means for agitating the aqueous phase is provided, and the gas hydrate is dispensed through the outlet. It is characterized in that the generated amount of the generated gas hydrate is detected and the drive amount of the stirring means is adjusted according to the generated amount.

The method for producing gas hydrate according to claim 4 is the method for producing gas hydrate according to claim 1 or 2, wherein the amount of gas hydrate produced through the outlet is detected, It is characterized in that the temperature inside the reaction vessel is adjusted according to the amount of production.

The method for producing gas hydrate according to claim 5 is the method for producing gas hydrate according to claim 1 or 2, wherein the production amount of gas hydrate discharged through the outlet is detected, It is characterized in that the pressure inside the reaction vessel is adjusted according to the amount of production.

A gas hydrate generator according to a sixth aspect of the present invention is a gas hydrate generator for producing a gas hydrate by reacting a raw material gas with water inside a reaction container. A hydrate outlet is provided, and water introduction amount adjusting means for adjusting the amount of water introduced into the reaction vessel is provided, and the liquid level of the water phase formed inside the reaction vessel is raised to float in the water phase. It is characterized in that a first control means for adjusting the water introduction amount adjusting means is provided so as to discharge the gas hydrate through the discharge outlet.

A gas hydrate generator according to a seventh aspect is the gas hydrate generator according to the sixth aspect, wherein the moisture contained in the gas hydrate is present in the gas hydrate payout path continuous to the payout outlet. Is provided, a water storage tank for storing the water separated by the separation section is provided, and the water collected in the water storage tank is reused as a raw material.

The gas hydrate generator according to claim 8 is the gas hydrate generator according to claim 6 or 7, wherein a stirring means for stirring the aqueous phase is provided, and the gas hydrate is discharged from the reaction vessel. A production amount detection means for detecting the production amount of gas hydrate is provided, and a second control means for controlling the stirring means based on the detection result of the production amount detection means is provided.

A gas hydrate generator according to a ninth aspect is the gas hydrate generator according to the sixth or seventh aspect, wherein temperature adjusting means for adjusting the temperature of the raw material gas introduced into the reaction vessel is provided. A production amount detection means for detecting the production amount of the gas hydrate discharged from the reaction vessel is provided, and the inside of the reaction vessel is set to a temperature suitable for production based on the detection result of the production amount detection means. A third control means for controlling the temperature adjusting means is provided.

The apparatus for producing gas hydrate according to claim 10 is the apparatus for producing gas hydrate according to claim 6 or 7, further comprising gas introduction amount adjusting means for adjusting the introduction amount of the raw material gas into the reaction vessel. Provided is a production amount detecting means for detecting the production amount of the gas hydrate discharged from the reaction container, and the inside of the reaction container is set to a pressure suitable for production based on the detection result of the production amount detecting means. Therefore, a fourth control means for controlling the gas introduction amount adjusting means is provided.

An apparatus for producing gas hydrate according to claim 11 is the apparatus for producing gas hydrate according to claim 6, wherein a stirring means for stirring the aqueous phase is provided, and the raw material gas is provided in a lower layer of the aqueous phase. It is characterized by supplying.

A gas hydrate generator according to a twelfth aspect is the gas hydrate generator according to the eleventh aspect, wherein the stirring means comprises a drive shaft and a stirring blade attached to the drive shaft. The driving shaft may be protruded from a lower portion of the reaction container.

A gas hydrate generator according to a thirteenth aspect is the gas hydrate generator according to the twelfth aspect, wherein the stirring means is provided with a release hole for releasing the raw material gas, and the gas hydrate is provided in a lower layer of the aqueous phase. The raw material gas is supplied.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a natural gas hydrate generator according to the present invention. In the figure, reference numeral 1 is a reaction vessel for reacting natural gas with water, and 2 is a reaction vessel 1.
A stirrer (stirring means) for stirring the internal water phase L, 3 is a motor for driving the stirrer 2, and 4 is a storage tank for collecting and storing the natural gas hydrate generated inside the reaction vessel 1.

A water pipe L1 for introducing water as a raw material from a water storage tank (not shown) and a gas pipe L2 for introducing natural gas as a raw material from a gas storage unit (not shown) are connected to the reaction vessel 1. . The storage tank 4 is connected to the reaction container 1 via a hydrate extraction pipe 5. The hydrate take-out pipe 5 is arranged so that the reaction container 1 side is high and the storage tank 4 side is low.

The reaction vessel 1 is provided with a water level detector S for detecting the water level of the water phase L, and the water pipe L1 is provided with a control valve (water introduction amount adjusting means) V1 for adjusting the amount of water introduced. There is. Furthermore, the control valve V1 is used to raise and lower the water level of the water phase L.
Control unit (first control means) C1 for controlling the opening degree of
Is provided. In the first controller C1, the set value of the water level of the water phase L can be changed.

Further, the reaction vessel 1 is provided with a pressure gauge P1 for measuring the pressure of the gas phase G, and the gas pipe L2 is provided with the gas phase G.
A control valve (gas introduction amount adjusting means) V2 for adjusting the introduction amount of the natural gas according to the measurement result of the pressure gauge P1 is provided in order to maintain the pressure suitable for the hydration reaction.

The gas pipe L2 is provided with a gas cooler 6 for cooling the natural gas before introducing it into the reaction vessel 1.
The refrigerator 7 is connected to the gas cooler 6 via the refrigerant pipe L3, and the refrigerant cooled by the refrigerator 7 is circulated in the gas cooler 6 through the refrigerant pipe L3 to cool the natural gas. It is like this. That is, the gas cooler 6
And the refrigerator 7 constitute temperature control means,
The temperature of the natural gas introduced into the reaction vessel 1 can be adjusted by controlling the output of the refrigerator 7.

The stirrer 2 has a propeller-shaped stirring blade 2b at the tip of a shaft 2a. Shaft 2a, stirring blade 2b
Has a hollow structure communicating with each other, and the base end of the shaft 2a is connected to the gas pipe L2 so that natural gas can be introduced. A plurality of gas discharge holes 2c for discharging the natural gas introduced into the stirring bar 2 are formed on the blade surface of the stirring blade 2b.

In the apparatus for producing gas hydrate constructed as described above, natural gas and water are introduced into the reaction vessel 1 and both are heated to a temperature higher than the freezing point (for example, 1 ° C. to 5 ° C.),
Moreover, the condition of a pressure higher than atmospheric pressure (for example, 40 atm) is prepared. At this time, the water level of the water phase L is the hydrate extraction pipe 5
It is set to a position lower than the opening (outlet) 5a on the side of the reaction container 1. When the state is stable, the stirring bar 2 is rotated to stir the water phase L. At this time, natural gas is discharged as fine bubbles from the gas discharge holes 2c formed in the stirring bar 2,
The hydration reaction with water, in combination with the action of stirring, produces natural gas hydrate.

Since the natural gas hydrate produced in the water phase L is lighter than water, it floats on the liquid surface of the water phase L and gradually gathers into a mass. When a certain amount of natural gas hydrate is generated, the set value of the water level of the water phase L is changed in the first controller C1 so that it is slightly higher than the opening 5a. At this time, the stirrer 2 is not stopped and the above operation is continued to generate natural gas hydrate.

When the water level of the water phase L rises, the mass of natural gas hydrate floating on the liquid surface flows out from the opening 5a by its own weight and flows into the storage tank 4 through the hydrate extraction pipe 5. When the natural gas hydrate can be taken out from the reaction container 1, the water level of the water phase L is changed in the first control unit C1 and returned to a position lower than the opening 5a. After that, the above operation is repeated to continuously generate the natural gas hydrate. In addition, it is preferable that the change of the water level by the first control unit C1 is performed, for example, at a predetermined time by setting a generation amount per hour.

According to the above-mentioned generator, the natural gas hydrate can be continuously taken out while the natural gas hydrate is being generated, so that the production efficiency can be improved.

Next, a second embodiment according to the present invention will be described with reference to FIG.
Will be described. In addition, the components already described in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
In the generator of the present embodiment, a hole 5b is formed in the middle of the hydrate extraction pipe 5, and an intermediate water storage tank 10 for temporarily storing water is provided continuously to the hole 5b.
Further, a separation grid (separation part) 11 for separating water from natural gas hydrate having a high water content is installed in the hole 5b.

The intermediate water tank 10 and the water pipe L1 are the water pipe L
4, the water pipe L4 is provided with a water pump 12 for returning the water accumulated in the intermediate water storage tank 10 to the water pipe L1 for reuse. The water pipe L4 is provided with a pressure gauge P2 for measuring the internal pressure. In addition, a water pipe L5 is connected across the water pump 12 before and after the water pump 12, and a control valve V3 is installed in the water pipe L5 to keep the amount of water introduced into the water pipe L1 constant. The opening degree of the control valve V3 is adjusted according to the measurement result of the pressure gauge P2.

In the generator configured as described above, when natural gas hydrate containing a large amount of water passes over the separation grid 11 while flowing into the storage tank 4 through the hydrate extraction pipe 5, the natural gas hydrate is discharged. The water contained in the hydrate passes through the separation grid 11 and falls, and is collected in the intermediate water storage tank 10. This will dehydrate the natural gas hydrate. The water accumulated in the intermediate water storage tank 10 is introduced into the water pipe L1 through the water pipe L4 and reused as a raw material.

According to the above-mentioned production apparatus, the produced natural gas hydrate can be dehydrated without requiring large-scale equipment or power, and the water separated by the dehydration can be reused for efficiency. It is possible to generate good.

Next, a third embodiment according to the present invention will be described with reference to FIG.
Will be described. In addition, the components already described in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
In the production apparatus of the present embodiment, the production amount detector (production amount detection means) W for detecting the production amount of the natural gas hydrate accumulated in the storage tank 4 and the information obtained by the production amount detector W are also included. In addition, the drive of the motor 3 is controlled and the stirring bar 2
Control unit (second control means) C for adjusting the rotation speed of the
2 and are provided.

In the production apparatus configured as described above, the production amount detector W detects the production amount of the natural gas hydrate accumulated in the storage tank 4. And the second
The control unit C2 controls the drive of the motor 3 based on the detection result of the generation amount detector W to change the rotation speed of the stirring bar 2. For example, if the production amount is small, the rotation speed is increased to increase the stirring speed, and the natural gas and water are actively contacted to increase the production amount. If the amount of production is large, the number of rotations is reduced to reduce the stirring speed, and the contact between natural gas and water is reduced to reduce the amount of production.

According to the above-mentioned generator, the production amount of natural gas hydrate can be stabilized by changing the rotation speed of the stirring bar 2 according to the production amount of natural gas hydrate.

Next, a fourth embodiment according to the present invention will be described with reference to FIG.
Will be described. In addition, the components already described in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
In the production apparatus of the present embodiment, the reaction amount of the reaction vessel 1 is determined based on the information obtained by the thermometer T that measures the temperature inside the reaction container 1 together with the production amount detector W and the production amount detector W.
A third control unit (third control means) C3 for controlling the output of the refrigerator 7 is provided to bring the internal temperature closer to the target value.

In the production apparatus configured as described above, the production amount detector W detects the production amount of the natural gas hydrate accumulated in the storage tank 4. And the third
The controller C3 controls the output of the refrigerator 7 based on the detection result of the production amount detector W, and changes the temperature of the natural gas introduced into the reaction container 1 by the gas cooler 6. For example, if the production amount is small, the temperature of the natural gas is lowered, and the natural gas and water are actively contacted to increase the production amount. Also, if the amount of production is large, raise the temperature of natural gas,
Reduces production by reducing contact between natural gas and water.

According to the above-mentioned generator, the amount of natural gas hydrate produced can be stabilized by changing the temperature of the natural gas introduced into the reaction vessel 1 in accordance with the amount of natural gas hydrate produced.

Next, a fifth embodiment according to the present invention will be described with reference to FIG.
Will be described. In addition, the components already described in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
In the production apparatus of the present embodiment, together with the production amount detector W, the control valve V2 is used in order to bring the pressure inside the reaction container 1 closer to the target value based on the information obtained by the production amount detector W.
Control section (fourth control means) C4 for adjusting the opening degree of
Is provided.

In the production apparatus constructed as described above, the production amount detector W detects the production amount of the natural gas hydrate accumulated in the storage tank 4. And the fourth
The controller C4 adjusts the opening degree of the control valve V2 based on the detection result of the production amount detector W to change the pressure of the natural gas introduced into the reaction container 1. For example, if the production amount is small, the pressure of the natural gas is increased, and the natural gas and water are actively contacted to increase the production amount. Further, if the production amount is large, the pressure of the natural gas is lowered to reduce the contact between the natural gas and water to reduce the production amount.

According to the above generator, the amount of natural gas hydrate produced can be stabilized by changing the pressure of the natural gas introduced into the reaction vessel 1 in accordance with the amount of natural gas hydrate produced.

Next, FIG. 6 shows a sixth embodiment according to the present invention.
Will be described. In addition, the components already described in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
In the generator of this embodiment, the stirrer 2 having a hollow structure is used.
No gas release hole is provided in the reaction vessel 1 for natural gas.
The gas is introduced into the water phase L through a plurality of gas discharge holes 1a formed in the bottom surface of the. In addition, in the present embodiment, the introduction route of the raw material water and the extraction route of the natural gas hydrate are not shown, but these may adopt the structures shown in the above-mentioned respective embodiments or other known structures. .

Further, the reaction vessel 1 is provided with a gas pipe L6 for extracting and removing unreacted gas in the gas phase G.
The unreacted gas referred to herein is a gas containing a component that does not undergo a hydration reaction under the conditions of the above temperature and pressure, or a component that is useful as a fuel. In the gas pipe L6,
A control valve V4 for adjusting the removal amount of the unreacted gas according to the measurement result of the pressure gauge P1 is provided in order to keep the gas phase G at a pressure suitable for the hydration reaction.

In the production apparatus configured as described above, the bubbles of natural gas discharged from the bottom surface of the reaction vessel 1 spread over the entire area of the water phase L and float while floating, so that the natural gas is spread over a wider range. Since the stirrer 2 agitates the water phase L in this state by contact with water, the production efficiency can be improved. Further, the stirring bar 2 can be easily processed as compared with the case where the stirring bar 2 is provided with a gas discharge hole.

According to the above production apparatus, the production efficiency of natural gas hydrate can be improved, and further, the effect in terms of equipment and cost can be expected.

Next, a seventh embodiment according to the present invention will be described with reference to FIG.
Will be described. In addition, the components already described in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
In the production apparatus of the present embodiment, the stirring bar 2 is installed on the bottom surface of the reaction container 1 in an inverted state. Further, a gas pipe L7 is provided to allow a part of the unreacted gas removed through the gas pipe L6 to flow into the reaction vessel 1 through the gas pipe L2. The reaction vessel 1 has gas pipes L2, L
Natural gas (including unreacted gas) is circulated through the gas circulation system composed of 6, L7.

At the introduction portion from the gas pipe L7 to L2,
An ejector 20 is provided. The ejector 20 is
This is a device in which natural gas introduced into the reaction vessel 1 through the gas pipe L2 is used as a driving medium, and unreacted gas supplied through the gas pipe L7 is driven to mix with the natural gas.

In the generator configured as described above, since the shaft 2a does not exist in the region where the bubbles float above the stirring blade 2b, the rotation of the shaft 2a is hindered by the generated natural gas hydrate. There is no. Therefore, the stirring bar 2 can be driven smoothly. Further, since the load on the stirrer 2 is small, the safety is improved.

Next, an eighth embodiment according to the present invention will be described with reference to FIG.
Will be described. In addition, the components already described in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
In the production apparatus of the present embodiment, the gas stirrer 2 is not provided in the stirrer 2 in the seventh embodiment, and for natural gas, the water phase L is passed through the plurality of gas discharge holes 1a formed in the bottom surface of the reaction vessel 1. Has been introduced to.

According to the generator configured as described above, the natural gas and water are brought into contact with each other over a wider range, and the stirrer 2 agitates the water phase L in this state, so that the natural gas hydrate is formed. It is possible to improve the generation efficiency of. Further, the stirring bar 2 can be easily processed as compared with the case where the stirring bar 2 is provided with a gas discharge hole. Furthermore, the stirrer 2 can be driven smoothly, and the load on the stirrer 2 is small and the safety is improved.

Each of the first to eighth embodiments described above does not function independently, and it is possible to combine the respective embodiments as appropriate to form a generating device that produces a higher effect.

In each of the first to eighth embodiments, the apparatus for producing gas hydrate from natural gas has been described, but the present invention is not limited to the one using natural gas as a raw material, and the hydrate is also available. Needless to say, it can be applied to any raw material gas that can obtain useful value by being converted.

[0056]

According to the present invention, when the gas hydrate is continuously produced, when the gas hydrate is accumulated on the liquid surface of the water phase, the liquid surface of the water phase is raised and the gas hydrate floating in the water phase is timely adjusted. By paying out, the productivity of gas hydrate can be improved. Further, by separating water contained in the discharged gas hydrate and reusing the water as a raw material, the gas hydrate production efficiency can be improved.

According to the present invention, the production amount of the discharged gas hydrate is detected, the degree of stirring the aqueous phase is adjusted according to the production amount, the temperature inside the reaction vessel is adjusted, By adjusting the pressure inside the reaction vessel, the amount of gas hydrate produced can be stabilized.

According to the present invention, the natural gas and the water are contacted in a wide range of the water phase by stirring the water phase while supplying the raw material gas to the lower layer of the water phase. The generation efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment according to the present invention, and is a schematic diagram showing a natural gas hydrate production apparatus.

FIG. 2 is a diagram showing a second embodiment according to the present invention, and is a schematic diagram showing a natural gas hydrate production apparatus.

FIG. 3 is a diagram showing a third embodiment according to the present invention, and is a schematic diagram showing a natural gas hydrate production apparatus.

FIG. 4 is a view showing a fourth embodiment according to the present invention, and is a schematic view showing a device for producing natural gas hydrate.

FIG. 5 is a view showing a fifth embodiment according to the present invention, and is a schematic view showing a device for producing natural gas hydrate.

FIG. 6 is a view showing a sixth embodiment according to the present invention, and is a schematic view showing a natural gas hydrate production device.

FIG. 7 is a view showing a seventh embodiment according to the present invention, and is a schematic view showing a device for producing natural gas hydrate.

FIG. 8 is a view showing an eighth embodiment according to the present invention, and is a schematic view showing a natural gas hydrate generation device.

[Explanation of symbols]

1 reaction vessel 2 stirrer 3 motor 4 water tank 5 Hydrate extraction tube 6 gas cooler 7 refrigerator 10 separation grid 11 Intermediate water tank

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C07C 9/04 F17C 11/00 B F17C 11/00 C10L 3/00 A F term (reference) 3E072 EA10 4H006 AA02 AA04 AC90 AD16 BD21 BD33 BD52 BE60

Claims (13)

[Claims] 1. A method for producing a gas hydrate by reacting a raw material gas with water in a reaction vessel to produce a gas hydrate, wherein the reaction vessel is provided with an outlet for the gas hydrate, When the liquid level of the aqueous phase formed inside the reaction vessel is set lower than the outlet to generate, and when the gas hydrate is accumulated on the liquid level of the aqueous phase, the liquid level is maintained while continuing the generation. And a gas hydrate floating in the water phase is discharged through the outlet, the method for producing gas hydrate. 2. The water contained in the gas hydrate discharged from the outlet is separated, and the water is also introduced into the reaction vessel to be used as a raw material.
A method for producing the gas hydrate described. 3. A stirrer for stirring the aqueous phase is provided, the amount of gas hydrate generated through the outlet is detected, and the amount of drive of the stirrer is adjusted according to the amount of gas hydrate generated. The method for producing gas hydrate according to claim 1 or 2, characterized in that. 4. The production amount of gas hydrate discharged through the outlet is detected, and the temperature inside the reaction vessel is adjusted according to the production amount.
Alternatively, the method for producing gas hydrate according to 2 above. 5. The production amount of gas hydrate discharged through the outlet is detected, and the pressure inside the reaction vessel is adjusted according to the production amount.
Alternatively, the method for producing gas hydrate according to 2 above. 6. A gas hydrate production apparatus for producing a gas hydrate by reacting a raw material gas with water inside a reaction vessel, wherein the reaction vessel is provided with an outlet for the gas hydrate,
A water introduction amount adjusting means for adjusting the amount of water introduced into the reaction vessel is provided, and the gas hydrate floating in the water phase is raised by raising the liquid level of the water phase formed inside the reaction vessel. A gas hydrate generation device comprising: first control means for adjusting the water introduction amount adjustment means so as to be discharged through. 7. A separation unit for separating water contained in the gas hydrate is provided in a gas hydrate discharge path continuous to the discharge outlet, and a water storage tank for storing the water separated by the separation unit is provided. The apparatus for producing gas hydrate according to claim 6, wherein the water accumulated in the water storage tank is reused as a raw material. 8. An agitating means for agitating the aqueous phase is provided, a production amount detecting means for detecting the production amount of the gas hydrate discharged from the reaction vessel is provided, and based on a detection result of the production amount detecting means. The gas hydrate generation device according to claim 6 or 7, further comprising: second control means for controlling the stirring means. 9. A temperature adjusting means for adjusting the temperature of the raw material gas introduced into the reaction container is provided, and a production amount detecting means for detecting the production amount of the gas hydrate discharged from the reaction container is provided. The third control means for controlling the temperature adjusting means so as to bring the inside of the reaction vessel to a temperature suitable for generation based on the detection result of the quantity detecting means. Gas hydrate generator. 10. A gas introduction amount adjusting means for adjusting the introduction amount of the raw material gas to the reaction vessel is provided, and a production amount detecting means for detecting the production amount of the gas hydrate discharged from the reaction vessel is provided. 7. A fourth control means is provided for controlling the gas introduction amount adjusting means so that the pressure inside the reaction vessel is adjusted to a pressure suitable for generation based on the detection result of the generation amount detecting means. Alternatively, the gas hydrate generation device according to item 7. 11. A stirrer for stirring the aqueous phase is provided,
The gas hydrate generator according to claim 6, wherein the raw material gas is supplied to a lower layer of the aqueous phase. 12. The gas according to claim 11, wherein the stirring means comprises a drive shaft and a stirring blade attached to the drive shaft, and the drive shaft is projected from a lower portion of the reaction vessel. Hydrate generator. 13. The apparatus for producing gas hydrate according to claim 12, wherein the stirring means is provided with a discharge hole for discharging the raw material gas to supply the raw material gas to a lower layer of the aqueous phase.