JP5885966B2 - Actuator device and power generation system - Google Patents

Description

  The present invention relates to an actuator device that converts thermal energy into mechanical energy using the physical action of gas hydrate and a power generation system using the actuator device.

  The gas hydrate is configured by incorporating gas molecules into a lattice or a cage structure constituted by hydrogen bonds of water molecules. Non-Patent Document 1 discloses a technique of using this gas hydrate for an actuator device. Gas hydrate absorbs heat when dissociating into gas and water, and generates heat when generating gas hydrate from gas and water. Therefore, dissociation by applying heat and generation by cooling are alternately performed, and the pressure generated during dissociation and the reduced pressure during generation can be used as mechanical energy. Since this dissociation and generation occurs at a relatively low temperature, the low temperature exhaust heat is used by decomposing the gas hydrate to absorb the low temperature heat and using the heat generated and released from the gas hydrate. It is expected that.

  Patent Document 1 includes a generator with a built-in heater, an absorber with a built-in cooler, a circulation pump that sends water in the absorber to the generator, and a pressure for reducing the water in the generator and sending it to the absorber. It has an absorption solution circulation system consisting of a decompression device, and a gas system having an expansion turbine with a suction port on the generator side and a discharge port on the absorption side, and reacts water with gas that gives kinetic energy to this turbine. Thus, there is disclosed a driving mechanism using a low-temperature heat source in which a gas capable of forming a hydrate crystal and having a critical decomposition temperature of 15 ° C. or higher is disclosed. This low-temperature heat source driving mechanism heats the hydrate with a generator to break it down into water and gas, blows this gas to the turbine and moves it, and cools this gas with water at the absorber to produce gas hydrate and To do. Since this gas hydrate decomposes at 15 ° C. and generates a gas pressure, it is intended to use a low-temperature heat source in the heater.

Japanese Patent Publication No.47-18493

Thermal / Electric Energy Technical Report H9- (1) TE01 “Investigative Study of Gas Hydrate Power Generation System”, Thermal / Electric Energy Technology Foundation, March 1998

  The present inventors have studied to reuse low-temperature exhaust heat as energy by converting the low-temperature exhaust heat into mechanical energy and then into electric energy using the apparatus of Patent Document 1. However, according to the present inventors' examination using this apparatus, it became clear that there is a problem in obtaining sufficient mechanical energy to obtain electric power from the reaction of dissociation and generation of gas hydrate. . That is, in general, the gas hydrate has a low speed for generating the gas hydrate from the gas and water, so that the speed for operating the actuator is low. Further, since only the gas pressure generated when the gas hydrate is dissociated is used, the output becomes smaller than that of an engine using a combustion reaction or the like. As a result, the amount of energy obtained per amount of gas hydrate used, ie, the energy density of the system, is reduced. Therefore, in order to drive the apparatus and obtain electric energy, it is necessary to enlarge the apparatus, which seems to cause an increase in cost.

  Therefore, the present inventors have been diligently researching to increase the energy density of the gas hydrate dissociation generation system. As a result, in the process of gas hydrate generation, improve the speed at which gas hydrate is generated from gas and water, and in the process of gas hydrate dissociation, increase the pressure generated by dissociation. Focused on and studied further.

  An object of the present invention is to provide an actuator device and a power generator capable of obtaining a large output by reacting gas hydrate at a sufficient pressure and speed to obtain a working fluid and effectively utilizing the energy of low-temperature exhaust heat. To provide a system.

  The actuator device according to the present invention includes a gas hydrate dissociation means that heats and dissociates gas hydrate to form a working fluid composed of a two-phase gas and water, and a piston that reciprocates by supplying and discharging the working fluid. Power means for extracting power and gas hydrate generating means for cooling the working fluid discharged from the power means to form gas hydrate.

  The gas hydrate is dissociated by the gas hydrate dissociating means to form a working fluid, and the piston is reciprocated by the pressure generated at that time. The working fluid becomes gas hydrate by the gas hydrate generating means and is used again. Since the working fluid is a two-phase fluid of gas and water, the pressure of the working fluid is higher than the pressure of only the gas, and a sufficient pressure for reciprocating the piston can be obtained. Since the gas hydrate can be dissociated at a lower temperature than normal temperature, it can be operated at a sufficient pressure with low-temperature heat, and the actuator device can effectively convert low-temperature exhaust heat to mechanical energy. Is obtained.

  The gas hydrate generating means is preferably configured to cool the working fluid to a melting point of water of −5 ° C. or higher and a melting point of water of + 5 ° C. or lower. By controlling the gas hydrate generation temperature to a liquid phase close to the melting point of water, the gas hydrate generation speed is increased, and a speed sufficient for operating the power means can be obtained.

  The gas hydrate generating means is preferably configured to cool the working fluid to a melting point of water or higher and a melting point of water + 3 ° C. or lower at normal pressure. By performing the generation at a temperature close to the melting point of water at normal pressure, the generation rate of the gas hydrate is maximized, and a high speed is obtained for operating the power means.

  The gas hydrate dissociation means is preferably configured to heat the working fluid to a melting point of water + 10 ° C. or higher and water melting point + 15 ° C. or lower. Since the gas hydrate is dissociated at a temperature lower than the normal temperature, the gas hydrate can be operated using low-temperature heat, and low-temperature exhaust heat, which has been rarely used in the past, can be used as power.

  Carbon dioxide is preferably used as the gas. Supply is easy with little risk of ignition.

  The gas hydrate dissociating means includes a container configured to be able to store gas hydrate and to be able to heat the stored gas hydrate, and the gas hydrate generating means is configured to store gas hydrate which can be stored. It is preferable that it consists of the container comprised so that cooling was possible. The temperature can be easily adjusted by heating or cooling the gas hydrate in the vessel, and the pressure of the gas hydrate reaction can be obtained.

  First and second gas hydrate treatment means capable of accommodating gas hydrate, wherein the gas hydrate dissociation means serves as first gas hydrate treatment means for heating the accommodated gas hydrate, and gas hydrate The generating means is a second gas hydrate processing means for cooling the accommodated gas hydrate, and after a certain time, the gas hydrate dissociating means is a second gas hydrate treatment for heating the accommodated gas hydrate. Preferably, the gas hydrate generating means is provided with a control means that can be controlled to be a first gas hydrate processing means for cooling the stored gas hydrate. By causing the first and second gas hydrate treatment means to function alternately as dissociation means and generation means, the gas hydrate moves according to the pressure at the time of dissociation or the reduced pressure at the time of generation. There is no need to circulate and the actuator device can be operated with high efficiency.

  The power generation system of the present invention includes the above-described actuator device and a power generation device connected to power means of the actuator device.

  Since the actuator device described above can obtain sufficient power with low temperature heat, a power generation device can be connected to this power means and the power can be taken out to generate electric power that can be effectively converted into electrical energy using low-temperature exhaust heat or the like. A system is obtained.

  According to the present invention, the gas hydrate is dissociated by the gas hydrate dissociating means to obtain a working fluid, and the piston is reciprocated by the pressure generated at that time. The working fluid becomes gas hydrate by the gas hydrate generating means and is used again. Since the working fluid is a two-phase fluid of gas and water, the pressure of the working fluid is higher than the pressure of only the gas, and a sufficient pressure for moving the piston can be obtained. Since the gas hydrate can be dissociated at a lower temperature than normal temperature, it can be operated at a sufficient pressure with low-temperature heat, and the actuator device can effectively convert low-temperature exhaust heat to mechanical energy. Is obtained.

It is the schematic which shows the actuator apparatus which concerns on the 1st Embodiment of this invention. It is a graph which shows the pressure-temperature cycle of the actuator apparatus of FIG. It is the schematic which shows the electric power generation system which concerns on the 2nd Embodiment of this invention. It is a graph which shows the pressure in a container in the production | generation dissociation reaction in Test Example 1 of this invention. It is a graph which shows the temperature conditions of the production | generation dissociation cycle in Test Example 2 of this invention.

(First embodiment)
As shown in FIG. 1, the actuator device 1 according to the first embodiment of the present invention includes a gas hydrate dissociation mechanism 2 (corresponding to a gas hydrate dissociation means of the present invention), a power mechanism 3 (power of the present invention). And a gas hydrate generating mechanism 4 (corresponding to the gas hydrate generating means of the present invention). In addition to these, the actuator device 1 of the present embodiment further includes a buffer mechanism 5.

  Here, the gas hydrate refers to what constitutes a so-called clathrate hydrate by incorporating gas molecules into a lattice or basket-like structure constituted by hydrogen bonds of water molecules. The gas molecule may be methane, ethane, propane, butane, hydrogen or carbon dioxide. The gas hydrate is stable in a solid state at around −20 ° C. and can be stored in the form of pellets or powder. The water constituting the gas hydrate can be appropriately selected from pure water or water adjusted for phase change conditions such as melting point described later by adding an additive to pure water. In the present embodiment, the gas hydrate is selected using gas molecules as carbon dioxide and pure water as water.

  The gas hydrate dissociation mechanism 2 is a mechanism that heats and dissociates the gas hydrate to form a working fluid 6 composed of a gas phase gas molecule and water. An example of the gas hydrate dissociation mechanism 2 is a container that can supply gas hydrate and includes a heater, a heat exchanger, and the like. When a heat exchanger is used, exhaust heat introduced from the outside can be used. In this embodiment, the gas hydrate dissociation mechanism 2 is a container equipped with a heat exchanger, and is equipped with a stirrer so that heat can be exchanged efficiently. The gas hydrate dissociation mechanism 2 includes a supply port (not shown) for supplying gas hydrate.

  The gas hydrate dissociation mechanism 2 is configured to heat the working fluid 6 to a melting point of water + 10 ° C. or higher and a melting point of water + 15 ° C. or lower. In the actuator device 1 shown in the figure, the working fluid 6 can be heated to approximately 15 ° C. by a heat exchanger and a mechanism (not shown) that adjusts the heat exchange medium from the heat exchanger. The gas hydrate is dissociated by heating to a melting point of water + 10 ° C. or higher and a melting point of water + 15 ° C. or lower to form a two-phase fluid, but other means such as decompression may be used in combination for the dissociation.

  The power mechanism 3 is a mechanism that takes out power through a piston 30 that reciprocates by supplying and discharging the working fluid 6. As the power mechanism 3, a known power mechanism having a piston can be used. In the present embodiment, a mechanism in which the crankshaft 31 is rotated by the piston 30 is used. In the example shown in the figure, two pistons 30 are provided, but three or more numbers may be provided.

  The power mechanism 3 is connected to the gas hydrate dissociation mechanism 2 by a pipe 7. In the present embodiment, the working fluid 6 discharged from the gas hydrate dissociation mechanism 2 is supplied to the piston 30 by the pipe 7. A pipe 71 that connects the gas hydrate dissociation mechanism 2 and the power mechanism 3 is provided with a valve 71 that can adjust the supply of the working fluid 6.

  The buffer mechanism 5 is provided to suppress the pressure fluctuation of the working fluid 6 generated by the piston 30 and prevent a sudden change in the pressure and flow rate of the working fluid 6 supplied to the gas hydrate generation mechanism 4. . In the present embodiment, a buffer tank that temporarily stores the working fluid 6 is installed. The buffer tank is sized to absorb the expected pressure fluctuations. The working fluid discharged from the piston 30 is stably supplied to the gas hydrate generation mechanism 4 by the buffer mechanism 5.

  The gas hydrate generation mechanism 4 cools the working fluid 6 discharged from the power unit 3 to form a gas hydrate. As the means for cooling the working fluid 6, outside air, natural energy, a refrigerator or the like can be used. In the present embodiment, the inside of the gas hydrate generation mechanism 4 is kept at a low temperature by a refrigerator (not shown). In the present embodiment, the gas hydrate generation mechanism 4 includes a screw pump 40. The screw pump 40 also serves as a mechanism for generating gas hydrate by applying pressure to the working fluid 6 cooled in the gas hydrate generating mechanism 4 and feeding the gas hydrate to the gas hydrate dissociating mechanism 2 side. ing. In the example shown in the figure, the screw pump 40 pressurizes the working fluid 6 to 0.8 MPa or more. The gas hydrate generation mechanism 4 has a larger volume than the gas hydrate dissociation mechanism 2 so that a large amount of gas hydrate can be generated at a time, and the reaction time is secured.

  The gas hydrate generation mechanism 4 cools the working fluid 6 to a melting point of water of −5 ° C. or higher and a melting point of water of + 5 ° C. or lower. In particular, it is desirable that the working fluid 6 is cooled to a melting point + 3 ° C. or higher than that of water. The production rate is particularly fast when placed in a liquid phase near the melting point of water. If the temperature to be generated is lower than the melting point of water, the water constituting the working fluid 6 is frozen and becomes ice, which causes a problem that the generation rate of gas hydrate is reduced and the working fluid 6 is difficult to flow through the piping. These can be prevented by setting the working fluid 6 to the liquid phase or higher so that the working fluid 6 remains in the liquid phase.

  Next, the operation of the actuator device 1 will be described. When the working fluid 6 enters the position A, that is, the inlet of the gas hydrate generating mechanism 4, as shown in FIG. 2, the temperature of the working fluid 6 is high in a two-phase state of gas and water. This working fluid 6 is cooled at a position A ′ in the gas hydrate generating mechanism 4 to a temperature not lower than the melting point of water and not higher than the melting point of water + 3 ° C. and pressurized to generate gas hydrate. At the exit position B, the working fluid 6 contains a large amount of solid phase, high pressure, and low temperature gas hydrate.

  When reaching the position C corresponding to the entrance of the gas hydrate dissociation mechanism 2, the working fluid 6 is heated to a melting point of water + 10 ° C. or higher and a melting point of water + 15 ° C. or lower to separate the gas hydrate into liquid water and gas. In the position D corresponding to the outlet of the gas hydrate dissociation mechanism 2, liquid phase water and gas components are increased, and the volume and temperature are increased.

  By supplying the working fluid 6 at the position D to the power mechanism 3, the pressure of the working fluid 6 is converted as mechanical work, and the position E discharged from the power mechanism 3 becomes low pressure again. The working fluid 6 returns to the position A at the inlet of the gas hydrate generation mechanism 4 through the position F of the buffer tank.

  In this actuator device 1, a low temperature difference power generation device for cold districts which can utilize the low-temperature waste heat discarded in large quantities and convert it into electric energy with high energy quality, and utilizes a heating difference between day and night. Available to:

(Second Embodiment)
As shown in FIG. 3, the power generation system 100 according to the second embodiment of the present invention is schematically configured to include a power generation device 32 connected to the power mechanism 3 of the actuator device 10. In addition, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The power generation device 32 is a device installed so that electric power can be taken out from the power mechanism 3, and in this embodiment is an AC generator connected so that rotation of the crankshaft 31 of the power mechanism 3 can be converted into electric power. Further, in the present embodiment, an inverter 33 is connected to the power generation device 32.

  The actuator device 10 includes a first gas hydrate treatment mechanism 21 (corresponding to the first gas hydrate treatment mechanism of the present invention) and a second gas hydrate dissociation mechanism 2 and a gas hydrate generation mechanism 4. The gas hydrate processing mechanism 22 (corresponding to the second gas hydrate processing means of the present invention) is connected to the power mechanism 3 by a pipe 7. Furthermore, the actuator device 10 is a flow path control device capable of supplying the heat medium to the cold heat tank 25 and the heat heat tank 26, and the heat medium to the first gas hydrate processing mechanism 21 and the second gas hydrate processing mechanism 22. 24.

  The first gas hydrate processing mechanism 21 and the second gas hydrate processing mechanism 22 both include a heat exchanger 23 inside. The heat exchanger 23 is composed of a pipe connected to the flow path control device 24 and is configured to distribute the heat medium supplied from the flow path control device 24.

  The flow path control device 24 is connected to the cooling / heating tank 25 and the heating / heating tank 26, and converts the cooling medium 27 supplied from the cooling / heating tank 25 or the heating medium 28 supplied from the heating / heating tank 26 into the first gas hydrate processing mechanism 21. And the second gas hydrate processing mechanism 22 can be controlled. The flow path control device 24 can adjust the pressure and temperature in the first gas hydrate processing mechanism 21 and the second gas hydrate processing mechanism 22 by supplying the cooling medium 27 and the heating medium 28.

  The cooling / heating tank 25 is a tank that can supply a cooling medium 27 such as a liquid having a large heat capacity to the flow path control device 24 at a low temperature. The cooling medium 27 is cooled by natural energy, a refrigerator, or the like, or is cooled. 27 can be supplied from the outside. In the present embodiment, the cold heat tank 25 includes a refrigerator that cools the antifreeze liquid as the cold medium 27. The heating tank 26 is a tank that can supply a heating medium 28 such as a liquid having a large heat capacity to the flow path control device 24 at a high temperature, and heats the heating medium 28 by exhaust heat or the like, or the heated heating medium 28 from the outside. Supply is possible. In the present embodiment, the heat tank 26 includes a heat exchanger that heats oil as the heat medium 28 using industrial waste heat.

  Next, the operation of the power generation system 100 will be described. In the power generation system 100, the first gas hydrate processing mechanism 21 operates as the gas hydrate dissociating means in the present invention, and the second gas hydrate processing mechanism 22 operates as the gas hydrate generating means in the present invention. The first step (corresponding to the first control state of the present invention), the first gas hydrate processing mechanism 21 operates as the gas hydrate generating means in the present invention, and the second gas hydrate processing The mechanism 22 is operated by continuously performing the second step (corresponding to the second control state of the present invention) that operates as the gas hydrate dissociation means in the present invention.

  As an example of the operation, the first step is first performed. Gas hydrate is supplied to the first gas hydrate processing mechanism 21. The flow path control device 24 supplies the heating medium 28 supplied from the heating tank 26 to the first gas hydrate processing mechanism 21 and the cooling medium 27 supplied from the cooling tank 25 to the second gas hydrate processing mechanism. 22 is supplied. At this time, the supply of the heating medium 28 is controlled so that the temperature inside the first gas hydrate treatment mechanism 21 becomes the melting point of water + 10 ° C. or more and the melting point of water + 15 ° C. or less, and the second gas hydrate treatment mechanism 22. The supply of the cooling medium is controlled so that the internal temperature is not less than the melting point of water and the melting point + 3 ° C.

  In this first step, as shown in the figure, the gas hydrate accommodated in the first gas hydrate treatment mechanism 21 is dissociated to become the working fluid 6 composed of carbon dioxide gas and water, and the power mechanism 3 The power mechanism 3 is supplied and operated. Then, the working fluid 6 is supplied from the power mechanism 3 to the second gas hydrate processing mechanism 22 to generate a gas hydrate.

  Next, the second step is performed. The flow path control device 24 supplies the heating medium 28 supplied from the heating tank 26 to the second gas hydrate processing mechanism 22 and the cooling medium 27 supplied from the cooling tank 25 to the first gas hydrate processing mechanism. 21. In other words, the roles of the gas hydrate dissociation means and the gas hydrate generation means described above are interchanged. Also in the second step, the working fluid 6 is supplied to the power mechanism 3 as described above, and the power mechanism 3 operates.

  The power mechanism 3 can be operated continuously by repeating the first process and the second process at regular intervals. The rotational movement of the power mechanism 3 is converted into electric power by the power generation device 32. The repeating time is appropriately selected according to the physical properties of gas hydrate (melting point of water used, etc.), the capacity of the container, the amount of gas hydrate, and the like.

  In this embodiment, for example, when the working fluid 6 is supplied from the first gas hydrate treatment mechanism 21 to the power mechanism 3 by the pressure of dissociation in the first step and then switched to the second step, the first step The gas hydrate treatment mechanism 21 is cooled, and the working fluid 6 flows into the first gas hydrate treatment mechanism 21 due to the reduced pressure to generate gas hydrate. The same applies when the second gas hydrate treatment mechanism 22 switches from the second step to the first step. For this reason, the working fluid 6 moves through the first and second gas hydrate treatment mechanisms 21 and 22 by the pressure of dissociation and the pressure reduction of generation. Separately, it is not necessary to provide a pump or the like for circulating the working fluid 6 to input energy, so that high energy generation efficiency can be obtained.

(Test Example 1)
(Experiment related to gas hydrate formation and dissociation cycle)
A gas hydrate filled with 50 cc of pure water and 50 cc of carbon dioxide in a space of about 100 cc between the inner wall of the outer tube and the outer wall of the inner tube by flowing a cooled antifreeze as a heat medium through the inner tube of the double tube heat exchange A gas hydrate consisting of carbon dioxide and water was generated in the container of the processing mechanism. Thereafter, a heat medium having a temperature close to room temperature was passed through the inner tube of the double tube heat exchange to dissociate carbon dioxide from the gas hydrate. Experiments on such a gas hydrate cycle were conducted.

  A gas hydrate formation reaction is performed by placing the container of the gas hydrate treatment mechanism at a melting point of water of −5 ° C. (−5 ° C.) for 60 minutes, and then placing it at the melting point of water + 15 ° C. (15 ° C.) for 30 minutes. A gas hydrate dissociation reaction was performed. During this time, the pressure in the container was measured. The results are shown in FIG.

  The internal pressure of the container during the generation reaction and the dissociation reaction was approximately 0.8 MPa. However, since carbon dioxide has a high solubility in water, it can be considered that it can be as low as about half that it can actually be used as a pressure increase in gas hydrate. From the results shown in FIG. 4, 460 L of water is required to output 1 kW of energy, and the differential pressure increases when the gas hydrate generation time is further increased. For example, when the generation time is 15 hours, the differential pressure is It is expected to reach 2.2 MPa. From these results, it was shown that the pressure can be taken out by the generation and dissociation of the gas hydrate, but from the viewpoint of the generation time, it is shown that the pressure is increased by a long time of several tens of minutes to several hours.

(Test Example 2)
(Experiment related to gas hydrate formation and dissociation cycle temperature conditions)
Using the same apparatus as in Test Example 1 as a test device, the generation temperature in the gas hydrate generation mechanism was adjusted, and the pressure difference during dissociation and generation was verified.

  As shown in FIG. 5, when the temperature at the time of (a) gas hydrate formation is set to about 0 ° C. to about 1.5 ° C. (above the melting point of water and close to the melting point of water), The pressure difference P1 obtained was the largest. On the other hand, when (b) set to about −6 to −5 ° C. (below the melting point of water and close to the melting point of water), the pressure difference P2 becomes small, and (c) constant using only ice for the experiment. The pressure difference P3 hardly occurred when the generation was carried out at -5 ° C. From this result, it was shown that the highest pressure difference was obtained when the generation temperature was set to a temperature higher than or equal to the melting point of ice and close to the melting point, and can be effectively used as power.

  All the embodiments described above are illustrative of the present invention and are not intended to be limiting, and the present invention can be implemented in other various modifications and changes. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

  The present invention facilitates the reuse of energy, particularly the utilization of low-temperature exhaust heat, so that it is useful in a wide range of fields such as industry and home, and can contribute to coping with environmental problems and energy supply problems.

DESCRIPTION OF SYMBOLS 1, 10 Actuator apparatus 2 Gas hydrate dissociation mechanism 3 Power mechanism 4 Gas hydrate production | generation mechanism 5 Buffer mechanism 6 Working fluid 7 Piping 21 1st gas hydrate processing mechanism 22 2nd gas hydrate processing mechanism 23 Heat exchanger DESCRIPTION OF SYMBOLS 24 Flow path control apparatus 25 Cooling tank 26 Heating tank 27 Cooling medium 28 Heating medium 30 Piston 31 Crankshaft 32 Electric power generation apparatus 33 Inverter 40 Screw pump 71 Valve 100 Electric power generation system

Claims (6)

Gas hydrate dissociation means for heating and dissociating the gas hydrate to form a working fluid composed of a gas and water two-phase fluid;
Power means for extracting power through a piston that reciprocates by supplying and discharging the working fluid;
Gas hydrate generating means for cooling the working fluid discharged from the power means to gas hydrate ,
The gas hydrate dissociating means and the gas hydrate generating means are composed of first and second gas hydrate treatment means capable of accommodating the gas hydrate,
The gas hydrate dissociating means is a first gas hydrate processing means for heating the stored gas hydrate, and the gas hydrate generating means is a second gas for cooling the stored gas hydrate. The gas hydrate dissociating means is a second gas hydrate processing means for heating the accommodated gas hydrate after a certain time, and the gas hydrate generating means is the accommodated. An actuator device comprising control means capable of being controlled to be a first gas hydrate processing means for cooling a gas hydrate . The actuator device according to claim 1, wherein the gas uses carbon dioxide. 3. The actuator device according to claim 2 , wherein the gas hydrate generating unit is configured to cool the working fluid to a melting point of water of −5 ° C. or higher and a melting point of water of + 5 ° C. or lower. The actuator device according to claim 2 or 3 , wherein the gas hydrate generating means is configured to cool the working fluid to a melting point of water or higher and a melting point of water + 3 ° C or lower. The gas hydrate dissociation means, the working fluid in any one of claims 2 to 4, characterized in that it is configured to heat below the melting point + 15 ° C. of the melting point + 10 ° C. or more water in the water The actuator device described. Power generation system characterized in that it includes an actuator device and a power generator connected to said power means of the actuator device according to claim 1, any one of 5.

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