Cold heat recovery equipment and ships

Abstract

To provide a cold heat recovery facility capable of suppressing freezing of fluid flowing in a heat exchanger while recovering cold heat of liquid hydrogen, and a ship.SOLUTION: A cold heat recovery facility comprises: a liquid hydrogen tank for storing liquid hydrogen; a first circuit configured to circulate a first working medium; a second circuit configured to circulate a second working medium having a freezing point higher than that of the first working medium; a first expansion turbine provided in the first circuit; a second expansion turbine provided in the second circuit; a first heat exchanger that vaporizes liquid hydrogen from the liquid hydrogen tank by heat exchange with the first working medium; and a second heat exchanger that vaporizes the liquid first working medium by heat exchange with the second working medium. The first circuit and the first expansion turbine form a part of a first thermodynamic cycle utilizing liquid hydrogen as a low-temperature heat source in the first heat exchanger, and the second circuit and the second expansion turbine form a part of a second thermodynamic cycle utilizing the first working medium as a low-temperature heat source in the second heat exchanger.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a cold heat recovery facility and a ship. [Background technology]

[0002] Methods have been proposed for recovering and utilizing the cold energy of cryogenic liquids such as liquefied natural gas (LNG).

[0003] Patent Document 1 describes a floating facility equipped with a power generation device that generates electricity using LNG cryogenics. This power generation device includes a thermodynamic cycle that uses a heat transfer medium as a working fluid, and generates electricity using a generator connected to an expansion turbine driven by the heat transfer medium (working fluid) flowing through a circuit. In this thermodynamic cycle, engine cooling water, seawater, or the like is used as a high-temperature heat source that exchanges heat with the heat transfer medium in an evaporator, and LNG is used as a low-temperature heat source that exchanges heat with the heat transfer medium in a condenser. The LNG is vaporized (regasified) in the condenser and then supplied to equipment that uses regasified LNG as fuel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-147221 Summary of the Invention [Problem to be solved by the invention]

[0005] The use of liquid hydrogen (LH2) as fuel for ships and other vessels has been proposed. The storage temperature of liquid hydrogen is approximately -253°C, which is lower than the storage temperature of LNG (approximately -163°C). Therefore, if liquid hydrogen is used as a substitute for LNG in a device that includes a thermodynamic cycle that recovers and utilizes the cold energy of LNG, the fluid (such as the working fluid or the fluid used as a high-temperature heat source) flowing through the heat exchanger (such as the condenser or evaporator) will become colder and freeze, potentially causing the thermodynamic cycle to malfunction.

[0006] In view of the above circumstances, at least one embodiment of the present invention aims to provide a cold energy recovery system and a ship that can recover cold energy from liquid hydrogen while suppressing freezing of fluid flowing through a heat exchanger. [Means for solving the problem]

[0007] At least one embodiment of the present invention relates to a cold heat recovery facility. a liquid hydrogen tank for storing liquid hydrogen; a first circuit configured to circulate a first working medium; a second circuit configured to circulate a second working medium having a freezing point higher than that of the first working medium; a first expansion turbine provided in the first circuit and configured to be driven by the first working medium in a gaseous state; a second expansion turbine provided in the second circuit and configured to be driven by the second working medium in a gaseous state; a first heat exchanger for vaporizing liquid hydrogen from the liquid hydrogen tank by heat exchange with the first working medium; a second heat exchanger for vaporizing the first working medium in a liquid state by heat exchange with the second working medium; a third heat exchanger for vaporizing the second working medium in a liquid state by heat exchange with a heat medium; Equipped with the first circuit and the first expansion turbine form part of a first thermodynamic cycle that utilizes the liquid hydrogen as a low-temperature heat source in the first heat exchanger; The second circuit and second expansion turbine form part of a second thermodynamic cycle that utilizes the first working medium as a low temperature heat source in the second heat exchanger.

[0008] Furthermore, a ship according to at least one embodiment of the present invention includes: The hull and The above-mentioned cold heat recovery equipment installed in the hull; a prime mover or a fuel cell provided in the hull and using the hydrogen vaporized in the first heat exchanger as fuel; Equipped with. [Effects of the Invention]

[0009] According to at least one embodiment of the present invention, there are provided a cryogenic heat recovery system and a ship that can recover cryogenic heat from liquid hydrogen while suppressing freezing of fluid flowing through a heat exchanger. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a vessel according to an embodiment; [Figure 2] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. [Figure 3] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. [Figure 4] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. [Figure 5] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. [Figure 6] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. [Figure 7] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. [Figure 8] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. [Figure 9] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. [Figure 10] FIG. 1 is a schematic diagram of an example of a computer (high-temperature equipment). [Figure 11] 1 is a schematic diagram of a cold heat recovery facility according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0012] (Vessel configuration) 1 is a schematic diagram of a ship to which a cold energy recovery system according to some embodiments is applied. As shown in Fig. 1, the ship 1 includes a hull 2 ​​(floating body), a cold energy recovery system 100 including a liquid hydrogen tank 10 provided on the hull 2, and a prime mover 6 provided on the hull 2.

[0013] The hull 2 ​​has a bow 2a shaped to reduce the resistance that the hull 2 ​​receives from fluids such as seawater, and a stern 2b to which a rudder 3 for adjusting the direction of travel of the hull 2 ​​can be attached.

[0014] The prime mover 6 may be configured to generate power to drive the propeller 4 as a propulsion device. The prime mover 6 may include an engine or a turbine, or may include an electric motor.

[0015] 1, the vessel 1 may be equipped with a fuel cell 8. An electric motor serving as the prime mover 6 may be driven by the power generated by the fuel cell 8.

[0016] In the exemplary embodiment shown in Fig. 1, the ship 1 is a ship that is propelled by hydrogen stored in a liquid hydrogen tank 10 as fuel. As will be described in detail below, the cold energy recovery system 100 includes a hydrogen line 12 for guiding hydrogen from the liquid hydrogen tank 10 to a supply destination, and a first heat exchanger 50 provided in the hydrogen line 12. In the cold energy recovery system 100, the liquid hydrogen from the liquid hydrogen tank 10 is vaporized into hydrogen gas through heat exchange in the first heat exchanger 50. This hydrogen gas is heated to an appropriate temperature using a heater or the like as necessary, and is then supplied as fuel to the engine 6 or the fuel cell 8.

[0017] In some embodiments, the ship 1 may be a tanker for transporting liquid hydrogen stored in a liquid hydrogen tank.

[0018] The cold energy recovery system according to the present invention is not limited to being installed on a ship, and may be installed on water facilities other than ships, or may be installed on land.

[0019] (Configuration of cold heat recovery equipment) Hereinafter, a cold heat recovery system 100 according to several embodiments will be described. Each of Figures 2 to 9 is a schematic diagram of the cold heat recovery system 100 according to one embodiment.

[0020] 2 to 9, a cold energy recovery system 100 according to some embodiments includes a liquid hydrogen tank 10 for storing liquid hydrogen, a hydrogen line 12 through which hydrogen flows from the liquid hydrogen tank 10, a first circuit 22 through which a first working medium flows, a first expansion turbine 24 provided in the first circuit 22, a second circuit 32 through which a second working medium having a higher freezing point than the first working medium flows, and a second expansion turbine 34 provided in the second circuit 32. The cold energy recovery system 100 also includes a first heat exchanger 50 for exchanging heat between hydrogen in the hydrogen line 12 and the first working medium in the first circuit 22, a second heat exchanger 52 for exchanging heat between the first working medium in the first circuit 22 and the second working medium in the second circuit 32, and a third heat exchanger 54 for exchanging heat between the second working medium in the second circuit 32 and a heat medium.

[0021] The liquid hydrogen in the liquid hydrogen tank 10 is pumped by a pump 14 provided in the hydrogen line 12 and vaporized by heat exchange with a first heat medium in the first heat exchanger 50. The vaporized hydrogen may be supplied to a destination such as the motor 6 or the fuel cell 8 via the hydrogen line 12. A first hydrogen heater 60 for heating hydrogen may be provided in the hydrogen line 12 downstream of the first heat exchanger 50. The first hydrogen heater 60 may be configured to heat the hydrogen by heat exchange with a heat medium (seawater, etc.).

[0022] The first circuit 22 and the first expansion turbine 24 form part of a first thermodynamic cycle 20 that utilizes liquid hydrogen as a low temperature heat source in a first heat exchanger 50 and a second working medium as a high temperature heat source in a second heat exchanger 52.

[0023] 1 is a Rankine cycle including the above-mentioned first expansion turbine 24 provided on the first circuit 22, a first heat exchanger 50 provided downstream of the first expansion turbine 24, a pump 23 provided downstream of the first heat exchanger 50, and a second heat exchanger 52 provided downstream of the pump 23. A first generator 26 may be connected to the first expansion turbine 24.

[0024] The first expansion turbine 24 is configured to expand the gaseous first working medium flowing through the first circuit 22 of the first thermodynamic cycle 20. This drives the first generator 26 to generate electricity. The first heat exchanger 50 is configured to condense the gaseous first working medium from the first expansion turbine 24 by heat exchange with liquid hydrogen as a low-temperature heat source. The pump 23 is configured to increase the pressure of the first working medium that has been condensed into a liquid by the first heat exchanger 50. The second heat exchanger 52 is configured to evaporate the liquid first working medium that has been pressurized by the pump 23 by heat exchange with the second working medium that is a high-temperature heat source.

[0025] In the first thermodynamic cycle 20 configured in this manner, the cold energy of the liquid hydrogen recovered through heat exchange in the first heat exchanger 50 can be used to drive the first expansion turbine 24 and / or the first generator 26.

[0026] The second circuit 32 and the second expansion turbine 34 form part of a second thermodynamic cycle 30 that utilizes the first working medium as a low temperature heat source in the second heat exchanger 52 and the heat medium as a high temperature heat source in the third heat exchanger 54.

[0027] 1 is a Rankine cycle including the above-mentioned second expansion turbine 34 provided on the second circuit 32, a second heat exchanger 52 provided downstream of the second expansion turbine 34, a pump 33 provided downstream of the second heat exchanger 52, and a third heat exchanger 54 provided downstream of the pump 33. A second generator 36 may be connected to the second expansion turbine 34.

[0028] The second expansion turbine 34 is configured to expand the gaseous second working medium flowing through the second circuit 32 of the second thermodynamic cycle 30. This drives the second generator 36 to generate electricity. The second heat exchanger 52 is configured to condense the gaseous second working medium from the second expansion turbine 34 by heat exchange with the first working medium serving as a low-temperature heat source. The pump 33 is configured to increase the pressure of the second working medium that has been condensed into a liquid by the second heat exchanger 52. The third heat exchanger 54 is configured to evaporate the liquid second working medium that has been pressurized by the pump 33 by heat exchange with a heat medium that is a high-temperature heat source.

[0029] In the second thermodynamic cycle 30 configured in this manner, the cold energy of the liquid hydrogen recovered through heat exchange with the first working medium in the second heat exchanger 52 can be used to drive the second expansion turbine 34 and / or the second generator 36.

[0030] A heat medium is supplied to the third heat exchanger 54 via a heat medium line 40. The heat medium line 40 may be provided with a pump 41 for pressure-feeding the heat medium.

[0031] As the second working medium, a fluid that is used as a working medium in a conventional cold heat recovery cycle in an LNG ship or the like can be used, and for example, an organic refrigerant such as R1234zee can be used.

[0032] As the first working medium, a fluid having a lower freezing point than the second working medium can be used, for example, a rare gas such as nitrogen (N2) or argon (Ar).

[0033] Seawater, or a cooling fluid (cooling water or cooling oil) remaining after cooling high-temperature equipment (such as an engine or a computer, which will be described later) can be used as the heat medium supplied to the third heat exchanger 54. The heat medium supplied to the third heat exchanger 54 may be a fluid having a higher freezing point than the second working medium.

[0034] The first hydrogen heater 60 provided in the hydrogen line 12 may be supplied with the same heat medium as the heat medium supplied to the third heat exchanger 54. For example, as shown in FIG. 2 etc., the heat medium may be supplied to the first hydrogen heater 60 via a branch line 42 branching off from the heat medium line 40 passing through the third heat exchanger 54. Alternatively, in some embodiments, the first hydrogen heater 60 may be supplied with a heat medium different from the heat medium supplied to the third heat exchanger 54.

[0035] In the above-described embodiment, the cold heat recovery system 100 includes a first thermodynamic cycle 20 using a first working medium and utilizing liquid hydrogen as a low-temperature heat source in a first heat exchanger 50, and a second thermodynamic cycle 30 using a second working medium and utilizing the first working medium as a low-temperature heat source in a second heat exchanger 52. The first working medium has a lower freezing point than the second working medium. Therefore, in the first thermodynamic cycle 20, heat is exchanged between the first working medium, which has a relatively low freezing point, and cryogenic liquid hydrogen, so the first working medium is less likely to freeze in the first heat exchanger 50. Furthermore, in the second thermodynamic cycle 30, heat is exchanged between the second working medium, which has a relatively high freezing point, and a heat medium serving as a high-temperature heat source in a third heat exchanger 54. Therefore, even if the heat medium is a fluid with a relatively high freezing point (e.g., seawater), the heat medium is less likely to freeze in the third heat exchanger 54. Therefore, according to the above-described embodiment, it is possible to prevent the fluid flowing through the heat exchanger from freezing while recovering the cold energy of the liquid hydrogen. Furthermore, in the above-described embodiment, the first expansion turbine 24 and the second expansion turbine 34 are driven by a multi-stage thermodynamic cycle including the first thermodynamic cycle and the second thermodynamic cycle, so the overall turbine output can be increased compared to a configuration using a conventional single-stage thermodynamic cycle. When the first generator 26 and the second generator 36 are connected to the first expansion turbine 24 and the second expansion turbine 34, respectively, the overall amount of power generation can be increased compared to a configuration using a conventional single-stage thermodynamic cycle.

[0036] In some embodiments, as shown in Figures 3 to 6, for example, the cold energy recovery system 100 further includes a second hydrogen heater 62 provided in the hydrogen line 12 downstream of the first heat exchanger 50 and upstream of the first hydrogen heater 60. The second hydrogen heater 62 is configured to heat the hydrogen in the hydrogen line 12 by heat exchange with at least a portion of the second working medium discharged from the second expansion turbine 34 of the second thermodynamic cycle 30.

[0037] 3 and 6, the second heat exchanger 52 and the second hydrogen heater 62 are provided in parallel in the second circuit 32. Specifically, the second hydrogen heater 62 is provided in a bypass line 35 that is provided in the second circuit 32 so as to bypass the second heat exchanger 52. The bypass line 35 is provided so as to branch off from the second circuit 32 downstream of the second expansion turbine 34 and upstream of the second heat exchanger 52, and to merge with the second circuit 32 downstream of the second heat exchanger 52 and upstream of the pump 33 (i.e., upstream of the third heat exchanger 54).

[0038] 4 and 5, the second heat exchanger 52 and the second hydrogen heater 62 are provided in series in the second circuit 32. Specifically, the second hydrogen heater 62 is provided downstream of the second expansion turbine 34 and upstream of the second heat exchanger 52 in the second circuit 32.

[0039] In the above-described embodiment, the second hydrogen heater 62 for exchanging heat between hydrogen and a second working medium is provided upstream of the first hydrogen heater 60 for exchanging heat between hydrogen and a heat medium in the hydrogen line 12 for guiding hydrogen to a supply destination. Therefore, in the first hydrogen heater 60, heat is exchanged between the hydrogen whose temperature has been raised by heat exchange with the second working medium in the second hydrogen heater 62 and the heat medium. Therefore, even if the heat medium supplied to the first hydrogen heater 60 is a fluid with a relatively high freezing point (e.g., seawater), the heat medium is unlikely to freeze in the first hydrogen heater 60. This makes it possible to prevent the fluid flowing through the first hydrogen heater 60 (heat exchanger) from freezing.

[0040] In some embodiments, for example as shown in FIG. 6, the cold energy recovery system 100 further includes a third hydrogen heater 76 provided downstream of the second hydrogen heater 62 and upstream of the first hydrogen heater 60 in the hydrogen line 12.

[0041] figure 6 In the exemplary embodiment shown in , the third hydrogen heater 76 is configured to heat hydrogen by heat exchange with the intermediate medium circulating through the intermediate medium circulation line 72. The intermediate medium circulation line 72 is provided with an intermediate medium cooler 78 for heating the intermediate medium by heat exchange with the heat medium, and a pump 73. Therefore, as the intermediate medium circulates through the intermediate medium circulation line 72, heat from the heat medium is transferred to the hydrogen via the intermediate medium, thereby heating the hydrogen.

[0042] The intermediate medium may include, for example, an organic medium such as glycol water or propane.

[0043] An intermediate medium tank 74 for storing the intermediate medium may be provided in the intermediate medium circulation line 72. The heat medium may be supplied to the intermediate medium cooler 78 via a branch line 46 branching off from the heat medium line 40.

[0044] According to the above-described embodiment, a third hydrogen heater 76 is provided in the hydrogen line 12 downstream of the second hydrogen heater 62 and upstream of the first hydrogen heater 60 to exchange heat between hydrogen and the intermediate medium flowing through the intermediate medium circulation line 72. The intermediate medium circulation line 72 is also provided with an intermediate medium cooler 78 to heat the intermediate medium through heat exchange with a heat medium (seawater, etc.). Therefore, in the third hydrogen heater 76, the hydrogen heated in the second hydrogen heater 62 is further heated through heat exchange with the intermediate medium that transported the heat of the heat medium. This effectively prevents the heat medium from freezing in the first hydrogen heater 60, which is located downstream of the third hydrogen heater 76 in the hydrogen line 12.

[0045] 3 to 6, it may be necessary to adjust (to a certain extent increase) the temperature of the second working medium supplied to the second hydrogen heater 62 (i.e., the temperature at the outlet of the second expansion turbine 34) in order to more reliably prevent freezing of the heat medium in the first hydrogen heater 60. In such cases, the temperature of the second working medium at the outlet of the second expansion turbine 34 can be adjusted, for example, as follows.

[0046] Here, FIG. 11 is a schematic diagram of a cold heat recovery facility 100 according to one embodiment, which is a modified example of the cold heat recovery facility 100 shown in FIG.

[0047] 11, a storage tank 110 for storing the second working medium is provided in the second circuit 32 downstream of the second heat exchanger 52 (more specifically, downstream of the junction of the bypass line 35) and upstream of the pump 33. The storage tank 110 is for storing an excess of the second working medium so that the second working medium in a liquid state can be stably delivered even if the balance between evaporation and condensation of the second working medium in the second thermodynamic cycle 30 changes.

[0048] The storage tank 110 is provided with a pressure sensor 112 for detecting the pressure inside the storage tank 110. The rotation speed of the pump 33 is controlled based on the pressure value inside the storage tank 110 detected by the pressure sensor 112.

[0049] The pressure on the high-pressure side of the second circuit 32 (between the outlet of the pump 33 and the inlet of the second expansion turbine 34) is controlled by the discharge pressure of the pump 33, and the pressure on the low-pressure side (between the outlet of the second expansion turbine 34 and the inlet of the pump 33) is controlled by the temperature of the condensate of the second working medium.

[0050] Therefore, first, the rotation speed of the pump 33 is adjusted to change the flow rate of the second working medium in the second circuit 32. When the flow rate of the second working medium is changed, the refrigerant temperature at the outlet of the second heat exchanger 52 changes, and accordingly the pressure in the storage tank 110 changes. The pressure inside the storage tank 110, detected by the pressure sensor 112, is fed back to the pump 33, so that the pressure on the low-pressure side can be controlled. This also makes it possible to adjust the temperature of the second working medium at the outlet of the second expansion turbine 34.

[0051] In this way, the temperature of the second working medium supplied to the second hydrogen heater 62 (ie, the temperature at the outlet of the second expansion turbine 34) can be appropriately adjusted.

[0052] The mechanism for adjusting the pressure and / or temperature in the second circuit 32 (the configuration including the storage tank 110 and the pressure sensor 112) described above is applicable to each of the embodiments shown in FIGS.

[0053] Although not specifically shown, in some embodiments, a storage tank for storing the first working medium may be provided in the first circuit 22 downstream of the first heat exchanger 50 and upstream of the pump 23. By providing the storage tank, an excess of the first working medium can be stored in the first circuit 22 so that the first working medium in a liquid state can be stably delivered even if the balance between evaporation and condensation of the first working medium in the first thermodynamic cycle 20 changes. 1 The working medium can be stored.

[0054] In some embodiments, as shown in FIG. 5 , for example, the cold energy recovery system 100 includes a working medium heater 45 for heating the first working medium upstream of the first expansion turbine 24 in the first circuit 22. The working medium heater 45 is provided downstream of the second heat exchanger 52 and upstream of the first expansion turbine 24 in the first circuit 22. In the exemplary embodiment shown in FIG. 5 , the working medium heater 45 is configured to heat the first working medium by heat exchange with the heat medium. The working medium heater 45 is connected to the first working medium heater 45 via a branch line 44 branching off from the heat medium line 40. ,heat The medium is supplied.

[0055] According to the above-described embodiment, the working medium heater 45 is provided for heating the first working medium flowing upstream of the first expansion turbine 24 in the first circuit 22, so it is possible to increase the temperature of the working medium at the inlet of the first expansion turbine 24. This makes it possible to increase the heat drop between the inlet and outlet of the first expansion turbine 24, thereby enabling the output of the first expansion turbine 24 to be increased.

[0056] 3 to 6, the second working medium is cooled in the second hydrogen heater 62 provided in the second circuit 32, and therefore the amount of heat exchanged between the first working medium and the second working medium in the second heat exchanger 52 is considered to be smaller than when the second hydrogen heater 62 is not provided. Even in such a case, the provision of the working medium heater 45 described above makes it possible to increase the gas temperature at the inlet of the first expansion turbine 24, thereby suppressing a decrease in the output of the first expansion turbine 24.

[0057] 7 and 8, the cold energy recovery system 100 includes an air conditioning cycle 120 using a third working medium as a refrigerant. The air conditioning cycle 120 includes a third circuit 121 through which the third working medium circulates, a condenser 124 provided in the third circuit 121 for condensing the third working medium, an expansion valve 125 for expanding the condensed third working medium, an evaporator 126 for evaporating the expanded third working medium, and a compressor 122 for compressing the gaseous third working medium. The compressor 122 is driven by a motor 123.

[0058] The condenser 124 is connected to the first thermodynamic cycle 20 or the second thermodynamic cycle 30 The third working medium of the air conditioning cycle 120 is condensed by heat exchange with the gaseous working medium upstream of the expansion turbine in the 8 In the exemplary embodiment shown in FIG. 1, the condenser 124 is configured to condense the third working medium by heat exchange with the first working medium in a gaseous state upstream of the first expansion turbine 24 in the first circuit 22 forming the first thermodynamic cycle 20. 7 In the exemplary embodiment shown, the condenser 124 is configured to condense the third working medium by heat exchange with the second working medium in a gaseous state upstream of the second expansion turbine 34 in the second circuit 32 forming the second thermodynamic cycle 30.

[0059] The evaporator 126 is configured to evaporate the third working medium by heat exchange with a heat medium supplied via a heat medium line 128. A pump 129 for pumping the heat medium may be provided in the heat medium line 128. The heat medium supplied to the evaporator 126 may be water, seawater, a cooling fluid for cooling equipment, or the like.

[0060] According to the above-described embodiment, the first working medium or the second working medium can be heated by heat exchange with the third working medium in the condenser 124 into which the high-temperature, high-pressure third working medium compressed by the compressor 122 in the air conditioning cycle 120 flows. This makes it possible to increase the heat drop between the inlet and outlet of the first expansion turbine 24 or the second expansion turbine 34, thereby increasing the output of the first expansion turbine 24 or the second expansion turbine 34.

[0061] The configuration of the air conditioning cycle 120 is not limited to the one shown in the figure, and various known air conditioning cycles can be applied.

[0062] In some embodiments, as shown in Fig. 9, for example, the cold energy recovery facility 100 includes a supply line 84 branching from the first circuit 22 upstream of the first expansion turbine 24 to supply the first working medium to the equipment 82, and a return line 88 joining the first circuit 22 downstream of the first expansion turbine 24 to return the first working medium from the equipment 82 to the first circuit 22. The first circuit 22 is configured to circulate an inert substance (such as nitrogen or a rare gas such as argon) as the first working medium. Note that in Fig. 9, the supply line 84 is provided with a valve 86 for adjusting the amount of the first working medium flowing through the supply line 84.

[0063] According to the above-described embodiment, an inert substance is used as the first working medium, and a supply line 84 branching off from the first circuit 22 upstream of the first expansion turbine 24 and a return line 88 joining the first circuit 22 downstream of the first expansion turbine 24 are provided. Therefore, by utilizing the pressure difference between the inlet and outlet of the first expansion turbine 24 in the first circuit 22, a gaseous inert substance (inert gas) can be supplied to the equipment 82 via the supply line 84, and the gaseous inert substance from the equipment 82 can be returned to the first circuit 22 via the return line 88. In this way, the first working medium, which is an inert substance, can be effectively used for another purpose.

[0064] The above-mentioned device 82 may be, for example, a gas transport pipe for transporting a flammable gas. The gas transport pipe may have a double-pipe structure including an inner piping for flowing the flammable gas and an outer piping provided on the outer periphery of the inner piping. An inert substance gas may be supplied to the outer periphery piping of the gas transport pipe via the above-mentioned supply line 84. The above-mentioned gas transport pipe may be a pipe constituting the hydrogen line 12.

[0065] According to the above-described embodiment, since the first working medium gas (inert gas), which is an inert substance, is supplied to the outer piping of the gas transport pipe having a double-pipe structure, even if a flammable gas leaks from the inner piping, the flammable gas is transported by the inert gas, and detection by the gas detector can be accelerated. In this way, the first working medium can be effectively used to quickly detect gas leakage.

[0066] As already mentioned, the heat medium supplied to the third heat exchanger 54 via the heat medium line 40 may include a cooling fluid (cooling water or cooling oil) that has been used to cool the high-temperature equipment.

[0067] In this case, the cooling fluid that has cooled the high-temperature equipment is supplied as a heat medium to the third heat exchanger 54. Therefore, the cooling fluid that has cooled the high-temperature equipment can be effectively used as a high-temperature heat source for operating the thermodynamic cycle, and the cold energy of the liquid hydrogen can be recovered while preventing the fluid flowing through the heat exchanger from freezing.

[0068] The high-temperature equipment may include a computer. Fig. 10 is a schematic diagram of a computer, which is an example of high-temperature equipment. The computer 92 shown in Fig. 10 is an immersion server configured to be cooled by being immersed in liquid refrigerant oil 101.

[0069] The calculator 92 is installed in an immersion tank 94, immersed in liquid refrigerant oil 101. A condenser 98 is provided above the calculator 92 in the immersion tank 94. The immersion tank 94 has a sealed structure, and liquid refrigerant oil 101 and gaseous refrigerant oil 102 coexist in the immersion tank 94. A cooling fluid (cooling water, cooling oil, or the like) is supplied to the condenser 98 via a cooling fluid line 96. A pump 97 is provided in the cooling fluid line 96.

[0070] In the immersion tank 94, 92 The liquid refrigerant oil 101 vaporizes due to the heat from the refrigerant oil 101. The gaseous refrigerant oil 102 is cooled and liquefied in the condenser 98. This cycle of vaporization and liquefaction of the refrigerant oil is repeated, and the heat from the computer 92 is transported to the cooling fluid via the refrigerant oil in the immersion tank 94 and the condenser 98. In this way, the computer 92 is cooled by the cooling fluid.

[0071] The cooling fluid discharged from the condenser 90 in the cooling fluid line 96 is supplied to the third heat exchanger 54 via the heat medium line 40. The cooling fluid discharged from the third heat exchanger 54 in the heat medium line 40 may be supplied again to the condenser 98 of the immersion tank 94 via the cooling fluid line 96.

[0072] The computer serving as the high-temperature equipment described above is not limited to an immersion server. In some embodiments, the computer may be any other known liquid-cooled computer, such as a water-cooled computer in which the processor is cooled with water.

[0073] According to the above-described embodiment, the cooling fluid that cooled the computer 92 is supplied as a heat medium to the third heat exchanger 54. Therefore, the cooling fluid that cooled the computer 92 can be effectively used as a high-temperature heat source for operating the thermodynamic cycle, and the cold energy of the liquid hydrogen can be recovered while preventing the fluid flowing through the heat exchanger from freezing.

[0074] The contents described in each of the above embodiments can be understood, for example, as follows.

[0075] (1) At least one embodiment of the cold energy recovery system (100) of the present invention comprises: a liquid hydrogen tank (10) for storing liquid hydrogen; a first circuit (22) configured to circulate a first working medium; a second circuit (32) configured to circulate a second working medium having a higher freezing point than the first working medium; a first expansion turbine (24) provided in the first circuit and configured to be driven by the first working medium in a gaseous state; a second expansion turbine (34) provided in the second circuit and configured to be driven by the second working medium in a gaseous state; a first heat exchanger (50) for vaporizing liquid hydrogen from the liquid hydrogen tank by heat exchange with the first working medium; a second heat exchanger (52) for vaporizing the first working medium in a liquid state by heat exchange with the second working medium; a third heat exchanger (54) for vaporizing the second working medium in a liquid state by heat exchange with a heat medium; Equipped with the first circuit and the first expansion turbine form part of a first thermodynamic cycle (20) that utilizes the liquid hydrogen as a low-temperature heat source in the first heat exchanger; The second circuit and second expansion turbine form part of a second thermodynamic cycle (30) that utilizes the first working medium as a low temperature heat source in the second heat exchanger.

[0076] The above-described configuration (1) is a cold energy recovery system including a first thermodynamic cycle using a first working medium and utilizing liquid hydrogen as a low-temperature heat source in a first heat exchanger, and a second thermodynamic cycle using a second working medium and utilizing the first working medium as a low-temperature heat source in a second heat exchanger, wherein the first working medium has a lower freezing point than the second working medium. Therefore, in the first thermodynamic cycle, heat is exchanged between the first working medium, which has a relatively low freezing point, and cryogenic liquid hydrogen, making it difficult for the first working medium to freeze in the first heat exchanger. Furthermore, in the second thermodynamic cycle, heat is exchanged between the second working medium, which has a relatively high freezing point, and a heat medium serving as a high-temperature heat source in a third heat exchanger. Therefore, even if the heat medium is a fluid with a relatively high freezing point (e.g., seawater), the heat medium is unlikely to freeze in the third heat exchanger. Therefore, the above-described configuration (1) makes it possible to recover cold energy from liquid hydrogen while suppressing freezing of the fluid flowing through the heat exchangers. Furthermore, in the configuration (1) above, the first expansion turbine and the second expansion turbine are driven by a multi-stage thermodynamic cycle including the first thermodynamic cycle and the second thermodynamic cycle, so the overall turbine output can be increased compared to a configuration using a conventional single-stage thermodynamic cycle.

[0077] (2) In some embodiments, in the configuration of (1), The cold heat recovery equipment comprises: a hydrogen line (12) for guiding hydrogen from the liquid hydrogen tank to a supply destination; a first hydrogen heater (60) provided in the hydrogen line downstream of the first heat exchanger and configured to heat the hydrogen in the hydrogen line by heat exchange with a heat medium; a second hydrogen heater (62) provided in the hydrogen line downstream of the first heat exchanger and upstream of the first hydrogen heater, and configured to heat the hydrogen in the hydrogen line by heat exchange with at least a portion of the second working medium discharged from the second expansion turbine; Equipped with.

[0078] According to the configuration (2) above, a second hydrogen heater for exchanging heat between hydrogen and a second working medium is provided upstream of a first hydrogen heater for exchanging heat between hydrogen and a heat medium in a hydrogen line for guiding hydrogen to a supply destination. Therefore, in the first hydrogen heater, hydrogen whose temperature has been increased by heat exchange with the second working medium is heat exchanged with the heat medium. Therefore, even if the heat medium supplied to the first hydrogen heater is a fluid with a relatively high freezing point (e.g., seawater), the heat medium is unlikely to freeze in the first hydrogen heater. Therefore, according to the configuration (2) above, freezing of the fluid flowing through the first hydrogen heater (heat exchanger) can be suppressed.

[0079] (3) In some embodiments, in the configuration of (2), The second hydrogen heater is configured to condense the at least a portion of the second working medium by heat exchange with the hydrogen.

[0080] According to the above configuration (3), the cold energy of the hydrogen is used to condense the first working medium in the first heat exchanger, and also to condense the second working medium in the second hydrogen heater. In this way, the cold energy of the hydrogen can be effectively used to operate two thermodynamic cycles (the first thermodynamic cycle and the second thermodynamic cycle).

[0081] (4) In some embodiments, in the configuration of (2) or (3), The cold heat recovery equipment comprises: a bypass line (35) branching from the second circuit downstream of the second expansion turbine and upstream of the second heat exchanger, and joining the second circuit downstream of the second heat exchanger and upstream of the third heat exchanger; The second hydrogen heater is configured to heat the hydrogen by heat exchange with the at least a portion of the second working medium flowing through the bypass line.

[0082] According to the configuration (4) above, a portion of the second working medium discharged from the second expansion turbine in the second circuit is supplied to the second hydrogen heater via the bypass line, so that hydrogen can be appropriately heated by heat exchange with the portion of the second working medium in the second hydrogen heater, thereby making it possible to prevent freezing of the heat medium in the first hydrogen heater, which is provided downstream of the second hydrogen heater in the hydrogen line.

[0083] (5) In some embodiments, in the configuration of (2) or (3), The second hydrogen heater is provided in the second circuit downstream of the second expansion turbine and upstream of the second heat exchanger.

[0084] According to the configuration (5) above, the second working medium discharged from the second expansion turbine in the second circuit is supplied to the second hydrogen heater, so that hydrogen can be appropriately heated by heat exchange with the second working medium in the second hydrogen heater, thereby making it possible to prevent freezing of the heat medium in the first hydrogen heater, which is provided downstream of the second hydrogen heater in the hydrogen line.

[0085] (6) In some embodiments, in any of the configurations (2) to (5) above, The cold heat recovery equipment comprises: an intermediate medium circulation line (72) through which the intermediate medium circulates; a third hydrogen heater (76) provided in the hydrogen line downstream of the second hydrogen heater and upstream of the first hydrogen heater, and configured to heat the hydrogen by heat exchange with the intermediate medium; an intermediate medium cooler (78) provided in the intermediate medium circulation line and configured to heat the intermediate medium by heat exchange with a heat medium; Equipped with.

[0086] According to the above configuration (6), a third hydrogen heater is provided in the hydrogen line downstream of the second hydrogen heater and upstream of the first hydrogen heater for heat exchange between hydrogen and the intermediate medium in the intermediate medium circulation line, and an intermediate medium cooler is provided in the intermediate medium circulation line for heating the intermediate medium through heat exchange with a heat medium (seawater, etc.). Therefore, in the third hydrogen heater, hydrogen after being heated in the second hydrogen heater is further heated through heat exchange with the intermediate medium that transported the heat of the heat medium. This makes it possible to more effectively prevent freezing of the heat medium in the first hydrogen heater located downstream of the third hydrogen heater in the hydrogen line.

[0087] (7) In some embodiments, in any of the configurations (1) to (6) above, The cold heat recovery equipment comprises: The system further includes a working medium heater (45) that is provided in the first circuit downstream of the second heat exchanger and upstream of the first expansion turbine and is configured to heat the first working medium flowing through the first circuit.

[0088] According to the configuration (7) above, since a working medium heater is provided in the first circuit to heat the first working medium flowing upstream of the first expansion turbine, the temperature of the working medium at the inlet of the first expansion turbine can be increased, thereby increasing the heat drop between the inlet and outlet of the first expansion turbine and thereby increasing the output of the first expansion turbine.

[0089] (8) In some embodiments, in any of the configurations (1) to (7) above, The cold heat recovery equipment comprises: a first generator (26) configured to be driven by the first expansion turbine; a second generator (36) configured to be driven by the second expansion turbine; Equipped with.

[0090] According to the configuration of (8) above, the first and second expansion turbines can drive the first and second generators, respectively, and thus, while using the cold energy of the liquid hydrogen to drive the first and second generators, it is possible to prevent freezing of the fluid flowing through the heat exchanger (third heat exchanger, etc.) as described in (1) above. Furthermore, in the configuration (8) above, the first expansion turbine and the second expansion turbine are driven by a multi-stage thermodynamic cycle including the first thermodynamic cycle and the second thermodynamic cycle, so the amount of power generated by the generator can be increased compared to a configuration using a conventional single-stage thermodynamic cycle.

[0091] (9) In some embodiments, in the configuration of (8), The cold heat recovery equipment comprises: The third working medium is configured to circulate, and the air conditioning cycle ( 120 ) forming part of the third circuit ( 121 )and, a condenser ( 124 )and, Equipped with The condenser is configured to condense the third working medium by heat exchange with the first working medium in a gaseous state upstream of the first expansion turbine in the first circuit or the second working medium in a gaseous state upstream of the second expansion turbine in the second circuit.

[0092] According to the above configuration (9), in the air conditioning cycle, the first working medium or the second working medium can be heated by heat exchange with the third working medium in the condenser into which the high-temperature, high-pressure third working medium compressed by the compressor flows, thereby increasing the heat drop between the inlet and the outlet of the first expansion turbine or the second expansion turbine, and thereby increasing the output of the first expansion turbine or the second expansion turbine.

[0093] (10) In some embodiments, in any of the configurations (1) to (9) above, The first circuit is configured to circulate an inert substance as the first working medium, The cold heat recovery equipment comprises: a supply line (84) branching off from the first circuit upstream of the first expansion turbine for supplying the first working medium to a device (82); a return line (88) that joins the first circuit downstream of the first expansion turbine and returns the first working medium from the equipment to the first circuit; Equipped with.

[0094] According to the above configuration (10), an inert substance is used as the first working medium, and a supply line branching off from the first circuit upstream of the first expansion turbine and a return line joining the first circuit downstream of the first expansion turbine are provided. Therefore, by utilizing the pressure difference between the inlet and outlet of the first expansion turbine in the first circuit, the inert substance gas can be supplied to the equipment via the supply line, and the inert substance gas from the equipment can be returned to the first circuit via the return line. In this way, the first working medium, which is an inert substance, can be effectively used for another purpose.

[0095] (11) In some embodiments, in the configuration of (10), The cold heat recovery equipment comprises: The equipment includes a gas transport pipe for transporting flammable gas, the gas transport pipe has a double pipe structure including an inner circumferential side pipe for flowing the flammable gas and an outer circumferential side pipe provided on the outer circumferential side of the inner circumferential side pipe, The outer periphery side pipe is configured to receive the first working medium from the supply line.

[0096] According to the configuration (11) above, since the first working medium gas (inert gas), which is an inert substance, is supplied to the outer piping of the gas transport pipe having a double-pipe structure, even if flammable gas leaks from the inner piping, the flammable gas is transported by the inert gas, and detection by the gas detector can be accelerated. In this way, the first working medium can be effectively used to quickly detect gas leakage.

[0097] (12) In some embodiments, in any of the configurations (1) to (11) above, The cold heat recovery equipment comprises: a heat medium line (40) for supplying the heat medium to the third heat exchanger; The heat transfer medium includes a cooling fluid that has cooled a high-temperature device.

[0098] In the configuration (12) above, the cooling fluid that has cooled the high-temperature equipment is supplied to the third heat exchanger as a heat medium. Therefore, by effectively utilizing the cooling fluid that has cooled the high-temperature equipment as a high-temperature heat source for operating the thermodynamic cycle, it is possible to recover the cold energy of the liquid hydrogen as described in (1) above and prevent the fluid flowing through the heat exchanger from freezing.

[0099] (13) In some embodiments, in the configuration of (12), The high-temperature equipment includes a computer (92).

[0100] According to the configuration of (13) above, the cooling fluid used to cool the computer is supplied to the third heat exchanger as a heat medium. Therefore, the cooling fluid used to cool the computer can be effectively used as a high-temperature heat source to operate the thermodynamic cycle, and as described in (1) above, the cold energy of the liquid hydrogen can be recovered while preventing the fluid flowing through the heat exchanger from freezing.

[0101] (14) A watercraft (1) according to at least one embodiment of the present invention includes: Hull (2) and a cold energy recovery system (100) according to any one of (1) to (13) above, which is provided on the ship body; a prime mover (6) or a fuel cell (8) provided on the hull and using the hydrogen vaporized in the first heat exchanger as fuel; Equipped with.

[0102] In the above configuration (14), the cold heat recovery system includes a first thermodynamic cycle using a first working medium and utilizing liquid hydrogen as a low-temperature heat source in a first heat exchanger, and a second thermodynamic cycle using a second working medium and utilizing the first working medium as a low-temperature heat source in a second heat exchanger, wherein the first working medium has a lower freezing point than the second working medium. Therefore, in the first thermodynamic cycle, heat is exchanged between the first working medium, which has a relatively low freezing point, and cryogenic liquid hydrogen, so the first working medium is less likely to freeze in the first heat exchanger. Furthermore, in the second thermodynamic cycle, heat is exchanged between the second working medium, which has a relatively high freezing point, and a heat medium serving as a high-temperature heat source in a third heat exchanger. Therefore, even if the heat medium is a fluid with a relatively high freezing point (e.g., seawater), the heat medium is less likely to freeze in the third heat exchanger. Therefore, the above configuration (14) makes it possible to recover cold from liquid hydrogen, which is a fuel for a ship, while suppressing freezing of the fluid flowing through the heat exchangers. Furthermore, in the configuration (14) above, the first expansion turbine and the second expansion turbine are driven by a multi-stage thermodynamic cycle including the first thermodynamic cycle and the second thermodynamic cycle, so the overall turbine output can be increased compared to a configuration using a conventional single-stage thermodynamic cycle.

[0103] The above describes an embodiment of the present invention, but the present invention is not limited to the above-described embodiment, and also includes forms in which the above-described embodiment is modified, or forms in which these forms are appropriately combined.

[0104] In this specification, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement strictly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. Furthermore, in this specification, the expressions "comprise," "include," or "have" a component are not exclusive expressions that exclude the presence of other components. [Explanation of symbols]

[0105] 1 ship 2. Hull 2a bow 2b stern 3 Rudder 4 propellers 6. Prime Mover 8 fuel cell 10 Liquid hydrogen tank 12 Hydrogen Line 14 Pump 20 First Thermodynamic Cycle 22 1st circuit 23 Pump 24 First expansion turbine 26 No. 1 Generator 30 Second Thermodynamic Cycle 32 2nd circuit 33 Pump 34 Second expansion turbine 35 Bypass Line 36 Second Generator 40 Heat Transfer Medium Line 41 Pump 42 Branch Line 44 Branch Line 45 Working medium heater 46 Branch Line 50 1st heat exchanger 52 Second heat exchanger 54 Third heat exchanger 60 First hydrogen heater 62 Second hydrogen heater 72 Intermediate medium circulation line 73 Pump 74 Intermediate medium tank 76 Third Hydrogen Heater 78 Intermediate Cooler 82 Equipment 84 Supply Line 86 Valve 88 Return Line 90 Condenser 92 Calculator 94 Immersion tank 96 Cooling fluid line 97 Pump 98 Condenser 100 Cold heat recovery equipment 101 Refrigerant oil in liquid state 102 Refrigerant oil in gaseous state 110 Storage Tank 112 Pressure Sensor 120 air conditioning cycles 121 3rd circuit 122 Compressor 123 Motor 124 Condenser 125 Expansion valve 126 Evaporator 128 Heat Transfer Medium Line 129 Pump

Claims

1. a liquid hydrogen tank for storing liquid hydrogen; a first circuit configured to circulate a first working medium; a second circuit configured to circulate a second working medium having a freezing point higher than that of the first working medium; a first expansion turbine provided in the first circuit and configured to be driven by the first working medium in a gaseous state; a second expansion turbine provided in the second circuit and configured to be driven by the second working medium in a gaseous state; a first heat exchanger for vaporizing liquid hydrogen from the liquid hydrogen tank by heat exchange with the first working medium; a second heat exchanger for vaporizing the first working medium in a liquid state by heat exchange with the second working medium; a third heat exchanger for vaporizing the second working medium in a liquid state by heat exchange with a heat medium; Equipped with the first circuit and the first expansion turbine form part of a first thermodynamic cycle that utilizes the liquid hydrogen as a low-temperature heat source in the first heat exchanger; the second circuit and the second expansion turbine form part of a second thermodynamic cycle that utilizes the first working medium as a low-temperature heat source in the second heat exchanger; a working medium heater provided in the first circuit downstream of the second heat exchanger and upstream of the first expansion turbine, the working medium heater configured to heat the first working medium flowing through the first circuit; Cold and heat recovery equipment.

2. a hydrogen line for guiding hydrogen from the liquid hydrogen tank to a supply destination; a first hydrogen heater provided in the hydrogen line downstream of the first heat exchanger and configured to heat the hydrogen in the hydrogen line by heat exchange with a heat medium; a second hydrogen heater that is provided in the hydrogen line downstream of the first heat exchanger and upstream of the first hydrogen heater, and that is configured to heat the hydrogen in the hydrogen line by heat exchange with at least a portion of the second working medium discharged from the second expansion turbine. The cold heat recovery facility according to claim 1 .

3. The second hydrogen heater is configured to condense the at least a portion of the second working medium by heat exchange with the hydrogen. The cold heat recovery facility according to claim 2.

4. a bypass line branching from the second circuit downstream of the second expansion turbine and upstream of the second heat exchanger, and joining the second circuit downstream of the second heat exchanger and upstream of the third heat exchanger; The second hydrogen heater is configured to heat the hydrogen by heat exchange with the at least a portion of the second working medium flowing through the bypass line. The cold heat recovery facility according to claim 2 or 3.

5. The second hydrogen heater is provided in the second circuit downstream of the second expansion turbine and upstream of the second heat exchanger. The cold heat recovery facility according to claim 2 or 3.

6. an intermediate medium circulation line through which the intermediate medium circulates; a third hydrogen heater provided in the hydrogen line downstream of the second hydrogen heater and upstream of the first hydrogen heater, the third hydrogen heater being configured to heat the hydrogen by heat exchange with the intermediate medium; an intermediate medium cooler provided in the intermediate medium circulation line and configured to heat the intermediate medium by heat exchange with a heat medium; The cold heat recovery facility according to any one of claims 2 to 5, comprising:

7. a first generator configured to be driven by the first expansion turbine; a second generator configured to be driven by the second expansion turbine; and Equipped with The cold heat recovery facility according to any one of claims 1 to 6.

8. A liquid hydrogen tank for storing liquid hydrogen; a first circuit configured to circulate a first working medium; a second circuit configured to circulate a second working medium having a freezing point higher than that of the first working medium; a first expansion turbine provided in the first circuit and configured to be driven by the first working medium in a gaseous state; a second expansion turbine provided in the second circuit and configured to be driven by the second working medium in a gaseous state; a first heat exchanger for vaporizing liquid hydrogen from the liquid hydrogen tank by heat exchange with the first working medium; a second heat exchanger for vaporizing the first working medium in a liquid state by heat exchange with the second working medium; a third heat exchanger for vaporizing the second working medium in a liquid state by heat exchange with a heat medium; Equipped with the first circuit and the first expansion turbine form part of a first thermodynamic cycle that utilizes the liquid hydrogen as a low-temperature heat source in the first heat exchanger; the second circuit and the second expansion turbine form part of a second thermodynamic cycle that utilizes the first working medium as a low-temperature heat source in the second heat exchanger; a first generator configured to be driven by the first expansion turbine; a second generator configured to be driven by the second expansion turbine; and a third circuit configured to circulate a third working medium and forming part of an air conditioning cycle; a condenser forming part of the air conditioning cycle for condensing the third working medium flowing through the third circuit; Equipped with The condenser is configured to condense the third working medium by heat exchange with the first working medium in a gaseous state upstream of the first expansion turbine in the first circuit or the second working medium in a gaseous state upstream of the second expansion turbine in the second circuit. Cold and heat recovery equipment.

9. A liquid hydrogen tank for storing liquid hydrogen; a first circuit configured to circulate a first working medium; a second circuit configured to circulate a second working medium having a freezing point higher than that of the first working medium; a first expansion turbine provided in the first circuit and configured to be driven by the first working medium in a gaseous state; a second expansion turbine provided in the second circuit and configured to be driven by the second working medium in a gaseous state; a first heat exchanger for vaporizing liquid hydrogen from the liquid hydrogen tank by heat exchange with the first working medium; a second heat exchanger for vaporizing the first working medium in a liquid state by heat exchange with the second working medium; a third heat exchanger for vaporizing the second working medium in a liquid state by heat exchange with a heat medium; Equipped with the first circuit and the first expansion turbine form part of a first thermodynamic cycle that utilizes the liquid hydrogen as a low-temperature heat source in the first heat exchanger; the second circuit and the second expansion turbine form part of a second thermodynamic cycle that utilizes the first working medium as a low-temperature heat source in the second heat exchanger; The first circuit is configured to circulate an inert substance as the first working medium, a supply line branching off from the first circuit upstream of the first expansion turbine for supplying the first working medium to equipment; a return line joining the first circuit downstream of the first expansion turbine for returning the first working medium from the equipment to the first circuit; Equipped with Cold and heat recovery equipment.

10. The equipment includes a gas transport pipe for transporting flammable gas, the gas transport pipe has a double pipe structure including an inner circumferential side pipe for flowing the flammable gas and an outer circumferential side pipe provided on the outer circumferential side of the inner circumferential side pipe, The outer circumferential piping is configured to receive the first working medium from the supply line. The cold heat recovery facility according to claim 9.

11. a heat medium line for supplying the heat medium to the third heat exchanger; The heat transfer medium includes a cooling fluid that has cooled a high-temperature device. The cold heat recovery facility according to any one of claims 1 to 10.

12. The high-temperature equipment includes a computer. The cold heat recovery facility according to claim 11.

13. The hull and The cold heat recovery system according to any one of claims 1 to 12, which is provided on the hull; a prime mover or a fuel cell provided on the hull, the prime mover or fuel cell using hydrogen obtained by vaporizing the liquid hydrogen in the first heat exchanger as fuel; A vessel equipped with:

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