Pump device and turbine power generation device

Abstract

A pump device for conveying liquefied gas is provided with a suction container (9) and a pump (10). The suction container (9) has a vacuum heat-insulating container (18) and a vacuum heat-insulating cover (19), and the pump (10) is disposed in a pump chamber (30) formed in the vacuum heat-insulating container (18). A gas layer space (L) is formed between the inner surface of the vacuum heat insulation container (18) and the outer surface of the sealing structure (25) of the vacuum heat insulation cover (19), the gas layer space (L) being used for forming a gas heat insulation layer composed of boil-off gas, and the gas layer space (L) is communicated with the pump chamber (30).

Description

Technical Field

[0001] This invention relates to pump devices for conveying liquefied gases such as liquid hydrogen, liquid nitrogen, liquid ammonia, liquefied natural gas, liquefied ethylene gas, and liquefied petroleum gas, as well as turbine power generation devices used in liquefied gas liquefaction equipment, and particularly to pump devices having a pump disposed in a suction container and turbine power generation devices having a turbine disposed in a suction container. Background Technology

[0002] Natural gas is widely used in thermal power generation and as a chemical feedstock. Additionally, hydrogen is anticipated as an energy source that does not produce carbon dioxide, which contributes to global warming. Applications of hydrogen as an energy source include fuel cells and turbine power generation. Since natural gas and hydrogen are in a gaseous state at room temperature, they are cooled and liquefied for storage and transportation. Liquefied natural gas (LNG) and liquid hydrogen, after being temporarily stored in LNG storage tanks, are pumped to power plants and factories.

[0003] Figure 17 This is a schematic diagram illustrating a conventional example of a pump device for conveying liquefied petroleum gas (LPG). The pump 500 is installed within a vertical suction container 505 connected to an LPG storage tank (not shown) containing LPG. LPG is introduced into the suction container 505 through the suction port 501, and the pump 500 is entirely immersed in the LPG. Therefore, the pump 500 is a submersible pump capable of operating in LPG. When the pump 500 is operating, LPG is drawn into the suction port 500a of the pump 500 and discharged from the pump 500 through the discharge port 502.

[0004] The liquefied gas inside the intake container 505 is mostly liquid, but a small amount of heat from the surrounding gas is transferred to the liquefied gas through the wall of the intake container 505. As a result, a portion of the liquefied gas vaporizes to form BOG (bulk vapor). Therefore, an BOG outlet port 503 is connected to the intake container 505 for discharging the BOG. ​​The BOG inside the intake container 505 is discharged from the intake container 505 through the BOG outlet port 503.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Publication No. Sho 64-36998 Summary of the Invention

[0008] However, because the liquefied gas supplied to the intake container 505 vaporizes due to even a slight change in heat input, bubbles easily form on the surface of the liquefied gas. The surface of the liquefied gas fluctuates significantly due to these bubbles. When this surface fluctuation occurs, the heat transfer from the outside of the intake container 505 (i.e., the ambient temperature region) through the wall of the intake container 505 to the liquefied gas changes, making it easier for the liquefied gas supplied to the intake container 505 to vaporize and form bubbles. As a result, the amount of vaporized gas in the intake container 505 increases. Furthermore, when this surface fluctuation occurs, convection occurs in the gas layer, making it easier for the liquefied gas to vaporize and form bubbles.

[0009] When the amount of evaporated gas in the suction container 505 increases, the loss of liquefied gas increases. Additionally, when air bubbles enter the pump 500, the head cannot be established, resulting in a loss of discharge from the pump 500. Therefore, the operation of the pump 500 becomes unstable.

[0010] In particular, since liquid hydrogen has a boiling point of -253°C at atmospheric pressure, it is very easy to vaporize. Therefore, it is desirable to improve the insulation of the intake container 505 to reduce the amount of heat input into the intake container 505, thereby stabilizing the liquid level fluctuation of the liquefied gas and minimizing the amount of vaporized gas in the intake container 505.

[0011] The same problem not only occurs in pump units used for liquefied gas (LPG), but may also occur in turbine power generation units used for LPG. Natural gas and hydrogen are liquefied into LPG through repeated compression, cooling, and expansion in a liquefaction plant. Because LPG is liquid, it is suitable for transportation. A turbine power generation unit is used in the expansion process of this liquefaction cycle. The expansion process can improve the efficiency of the liquefaction plant by increasing the liquefaction volume and recovering electrical energy. The turbine power generation unit has a turbine configured within a suction container. It is also desirable to integrate with... Figure 17 The pump unit shown also minimizes the amount of evaporated gas drawn into the container.

[0012] Therefore, the present invention provides a pump device with improved insulation of the suction container housing a pump for conveying liquefied gas. Additionally, the present invention provides a turbine power generation device with improved insulation of the suction container housing a turbine that rotates using the fluid energy of liquefied gas.

[0013] One approach provides a pumping device for conveying liquefied gas, the pumping device comprising an intake container and a pump disposed within the intake container, the intake container having: a vacuum-insulated container having a double-walled structure for creating an internal vacuum; and a vacuum-insulated cover having a sealed structure for creating an internal vacuum, the pump being disposed within a pump chamber formed by the vacuum-insulated container and the vacuum-insulated cover, a gas layer space for forming a gas insulation layer composed of evaporated gas being formed between the inner surface of the vacuum-insulated container and the outer surface of the sealed structure, the gas layer space communicating with the pump chamber.

[0014] In one embodiment, the pump assembly further includes a baffle structure disposed within the suction container and above the pump.

[0015] In one embodiment, the baffle structure is disposed between the vacuum insulation cover and the pump.

[0016] In one embodiment, the baffle structure is a baffle disposed between the pump and the hermetically sealed structure.

[0017] In one embodiment, the pump assembly further includes a discharge pipe connected to the outlet of the pump and extending through the vacuum insulation cover, with the baffle fixed to the discharge pipe.

[0018] In one embodiment, the baffle is fixed to the inner surface of the vacuum-insulated container.

[0019] In one embodiment, the baffle is positioned above the liquid level of the liquefied gas within the vacuum-insulated container.

[0020] In one embodiment, the baffle is positioned below the liquid level of the liquefied gas within the vacuum-insulated container.

[0021] In one embodiment, the baffle structure is fixed to the sealing structure.

[0022] In one embodiment, the baffle structure is a labyrinth flow path structure that forms a labyrinth flow path.

[0023] By designing the suction container as a vacuum-insulated container with a double-walled structure that creates an internal vacuum, the amount of heat input from the sides of the suction container can be significantly reduced.

[0024] During pump operation, a portion of the liquefied gas in the suction container vaporizes to form evaporated gas. This evaporated gas, existing within a gas layer space formed in the dead-end space structure at the top of the suction container, functions as a gas insulation layer. The gas insulation layer is one of the insulation measures implemented for portions that cannot be entirely used as vacuum insulation. The gas insulation layer improves insulation performance against heat input transferred from above the suction container to the inner wall of the vacuum-insulated container.

[0025] Furthermore, the baffle structure positioned below the gas layer space can suppress the influence of liquid surface disturbance of liquefied gas in the vacuum insulation container during pump operation, thereby preventing the fluidization or convection of the gas insulation layer composed of evaporated gas.

[0026] One embodiment provides a pumping device for conveying liquefied gas, the pumping device comprising: a suction container having a suction port; a pump disposed within the suction container; and an evaporating gas discharge pipe connected to the suction container, the suction container having an insulating container and a vacuum-insulated cover having a sealed structure having an internal vacuum, the pump being disposed in a pump chamber formed by the insulating container and the vacuum-insulated cover, a gas layer space for forming a gas insulating layer composed of evaporating gas being formed between the inner surface of the insulating container and the outer surface of the sealed structure, the gas layer space communicating with the pump chamber, and the evaporating gas discharge pipe opening in the suction container at a position lower than the gas layer space.

[0027] In one embodiment, the evaporation gas discharge pipe is connected to the side wall of the insulating container at a position lower than the gas layer space.

[0028] In one embodiment, the evaporative gas discharge pipe has a first pipe connected to a position on the side wall of the insulated container between the intake port and the gas layer space, and a second pipe extending upward from the first pipe.

[0029] In one embodiment, the vacuum insulation cover seals the upper opening of the insulation container and forms a dead-end space at the upper part of the insulation container that prevents gas from escaping.

[0030] In one embodiment, the evaporative gas exhaust pipe passes through the vacuum insulation cover and protrudes downward from the bottom surface of the vacuum insulation cover.

[0031] In one embodiment, the insulating container is a vacuum insulating container with a double-walled structure that creates a vacuum inside.

[0032] One approach provides a turbine power generation device that generates electricity using the fluid energy of liquefied gas. The turbine power generation device includes an intake container and a turbine disposed within the intake container. The intake container has: a vacuum-insulated container having a double-walled structure that creates an internal vacuum; and a vacuum-insulated cover having a sealed structure that creates an internal vacuum. The turbine is disposed within a turbine chamber formed by the vacuum-insulated container and the vacuum-insulated cover. A gas layer space is formed between the inner surface of the vacuum-insulated container and the outer surface of the sealed structure for forming a gas insulating layer composed of evaporated gas, and the gas layer space communicates with the turbine chamber.

[0033] One embodiment provides a turbine power generation device that generates electricity using the fluid energy of liquefied gas. The turbine power generation device comprises: an intake container having an intake port; a turbine disposed within the intake container; and an evaporative gas discharge pipe connected to the intake container. The intake container has an insulating container and a vacuum-insulated cover having a sealed structure with an internal vacuum. The turbine is disposed within a turbine chamber formed by the insulating container and the vacuum-insulated cover. A gas layer space for forming a gas insulating layer composed of evaporative gas is formed between the inner surface of the insulating container and the outer surface of the sealed structure. The gas layer space communicates with the turbine chamber. The evaporative gas discharge pipe opens within the intake container at a position lower than the gas layer space.

[0034] Invention Effects

[0035] During the operation of the pump or turbine, a portion of the liquefied gas in the intake container vaporizes to form evaporated gas. This evaporated gas volume exists within the gas layer space and functions as a gas insulation layer. Therefore, the insulation performance of the intake container can be improved. Furthermore, a baffle structure positioned below the gas layer space can suppress the effects of liquid surface disturbance of the liquefied gas within the vacuum insulation container that occurs during pump or turbine operation, thereby preventing the flow or convection of the gas insulation layer composed of evaporated gas. As a result, the baffle structure can maintain the insulation effect of the gas insulation layer composed of evaporated gas.

[0036] When the liquefied gas level rises during pump or turbine operation, the evaporation gas discharge pipe allows a portion of the liquefied gas to escape from the intake container, thus preventing the liquefied gas level from approaching the gas insulation layer composed of evaporating gas. As a result, the evaporation gas discharge pipe prevents the gas insulation layer from flowing or convection and suppresses bubble formation, maintaining the insulation effect of the gas insulation layer composed of evaporating gas. Furthermore, because the dead-end space formed within the intake container is a closed structure, it makes it difficult for the liquefied gas level to rise further.

[0037] In the intake container, the amount of heat transferred from the ambient temperature region above the intake container to the interior of the intake container is determined to be the distance from the ambient temperature region above to the surface of the liquefied gas up to the opening of the evaporating gas discharge pipe. Therefore, it is possible to suppress the increase in heat input into the intake container and stabilize the fluctuation of the liquefied gas surface. As a result, the amount of evaporating gas in the intake container can be reduced. Attached Figure Description

[0038] Figure 1 This is a schematic diagram illustrating one embodiment of a liquefied gas delivery system for transporting liquefied gas.

[0039] Figure 2 This is a schematic diagram illustrating one embodiment of a pump device.

[0040] Figure 3 It means Figure 2 An enlarged cross-sectional view of a portion of the pump assembly shown.

[0041] Figure 4 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0042] Figure 5 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0043] Figure 6 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0044] Figure 7 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0045] Figure 8 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0046] Figure 9 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0047] Figure 10 It means Figure 9 An enlarged cross-sectional view of a modified embodiment of the shown.

[0048] Figure 11 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0049] Figure 12 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0050] Figure 13 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0051] Figure 14This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0052] Figure 15 This is an enlarged cross-sectional view showing other embodiments of the pump device.

[0053] Figure 16 This is a schematic diagram illustrating one embodiment of a turbine power generation device.

[0054] Figure 17 This is a schematic diagram illustrating a conventional example of a pump device used to transport liquefied gas. Detailed Implementation

[0055] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a schematic diagram illustrating one embodiment of a liquefied gas delivery system for transporting liquefied gas. For example... Figure 1 As shown, the liquefied gas (LPG) delivery system includes a storage tank 1 for storing LPG, a pump column 2 disposed within the storage tank 1, an in-tank pump 3 disposed within the pump column 2, and a pump unit 7 connected to the in-tank pump 3 via an LPG delivery pipeline 5. Examples of LPG include liquid hydrogen, liquefied natural gas, liquid ammonia, liquid nitrogen, liquefied ethylene gas, and liquefied petroleum gas.

[0056] The pump assembly 7 includes a suction container 9, which serves as a fluid container, and a pump 10 disposed within the suction container 9. Liquefied gas supplied via the liquefied gas delivery line 5 is introduced into the suction container 9. The pump 10 delivers the liquefied gas in the suction container 9 to a usage location (not shown) via a discharge pipe 33. To pressurize the liquefied gas to a target pressure, multiple pump assemblies 7 may sometimes be connected in series.

[0057] The heat from the ambient gas surrounding the pump unit 7 is slightly transferred to the liquefied gas in the suction container 9. As a result, a portion of the liquefied gas vaporizes and forms evaporative gas (BOG) in the suction container 9. Therefore, the liquefied gas delivery system includes an evaporative gas return line 15 that returns the BOG from the suction container 9 to the storage tank 1.

[0058] Figure 2 This is a schematic diagram illustrating one embodiment of the pump assembly 7. The pump assembly 7 includes a suction container 9 and a pump 10 disposed within the suction container 9. The suction container 9 includes a vacuum-insulated container 18 having a double-walled structure that creates a vacuum inside; and a vacuum-insulated cover 19 that closes the upper opening of the vacuum-insulated container 18. The side walls and bottom walls of the vacuum-insulated container 18 are constructed with a double-walled structure having an inner wall 22A and an outer wall 22B. A vacuum is formed between the inner wall 22A and the outer wall 22B. The vacuum-insulated container 18 of this embodiment has a circular horizontal cross-section, but in one embodiment, it may also have a horizontal cross-section of other shapes such as polygons.

[0059] The vacuum insulation cover 19 has a sealed structure 25 that creates an internal vacuum, and a flange 26 fixed to the outer surface of the sealed structure 25. The flange 26 is detachably fixed to the upper end of the vacuum insulation container 18 by fasteners such as screws (not shown). Since the suction container 9 is composed of a vacuum insulation container 18 with a double-walled structure that creates an internal vacuum, and a vacuum insulation cover 19 with a sealed structure 25 that creates an internal vacuum, the amount of heat input from the sides and bottom of the suction container 9 can be significantly reduced. Although a small amount of heat is input through the inner wall 22A of the vacuum insulation container 18, the heat input from the top of the suction container 9 is largely reduced by the sealed structure 25 that creates an internal vacuum in the vacuum insulation cover 19.

[0060] The lower part of the sealed structure 25 is located inside the vacuum insulation container 18, while the upper part of the sealed structure 25 and the flange 26 are located outside the vacuum insulation container 18. The pump 10 is disposed within the pump chamber 30 formed by the vacuum insulation container 18 and the vacuum insulation cover 19.

[0061] The pump assembly 7 also includes a discharge pipe 33 connected to the outlet 31 of the pump 10 and extending through the vacuum insulation cover 19 to the outside of the pump chamber 30, and an evaporation gas discharge pipe 37 extending through the vacuum insulation cover 19 and connecting the inside and outside of the pump chamber 30. The discharge pipe 33 is fixed to the sealed structure 25 and the pump 10, and the evaporation gas discharge pipe 37 is fixed to the sealed structure 25.

[0062] The suction container 9 has a suction port 40 that connects to the side wall of the vacuum-insulated container 18. (The last sentence appears to be incomplete and possibly refers to a different process.) Figure 1 The liquefied gas delivered by the liquefied gas delivery pipeline 5 shown is introduced into the suction container 9 through the suction port 40. During the operation of pump 10, pump 10 is completely immersed in liquefied gas. Therefore, pump 10 is a submersible pump capable of operating in liquefied gas.

[0063] Pump 10 includes: an electric motor 41 having an electric motor rotor 41A and an electric motor stator 41B; a rotating shaft 42 connected to the electric motor 41; a plurality of bearings 44 rotatably supporting the rotating shaft 42; a plurality of impellers 45 fixed on the rotating shaft 42; and a pump casing 46 housing the plurality of impellers 45. In one embodiment, pump 10 may also have a single impeller 45.

[0064] When power is supplied to the motor 41 via a cable (not shown), the motor 41 causes the rotating shaft 42 and impeller 45 to rotate as a unit. As the impeller 45 rotates, liquefied gas is drawn into the pump 10 from the suction port 43 and discharged into the discharge pipe 33 through the discharge port 31. Further, the liquefied gas flows within the discharge pipe 33 and is transported to the point of use.

[0065] Figure 3 It means Figure 2An enlarged cross-sectional view of a portion of the pump assembly shown. (See image) Figure 3 As shown, a gas layer space L is formed between the inner surface of the vacuum insulated container 18 and the outer surface of the sealed structure 25. More specifically, the gas layer space L is surrounded by the inner surface of the inner wall 22A of the vacuum insulated container 18, the side surface of the sealed structure 25, and the lower surface of the flange 26. A gas insulation layer composed of evaporated gas is formed within this gas layer space L. The gas layer space L communicates with the pump chamber 30 within the vacuum insulated container 18. A portion of the evaporated gas generated within the pump chamber 30 is guided into the gas layer space L.

[0066] During the operation of pump 10, due to a small amount of heat input from outside the suction container 9 and / or the heating of the motor 41 of pump 10, a portion of the liquefied gas vaporizes to form evaporating gas. Since the gas layer space L is surrounded by the inner surface of the inner wall 22A of the vacuum insulated container 18, the side of the sealed structure 25, and the lower surface of the flange 26, forming a dead-end space structure that prevents gas from flowing outwards, the evaporating gas volume exists within the gas layer space L, forming a gas insulation layer. This gas insulation layer within the gas layer space L is located between the vacuum insulated container 18 and the vacuum insulated cover 19, preventing heat input from the outside, especially preventing heat input from the flange 26 of the vacuum insulated cover 19 at the top of the suction container 9 through the inner wall 22A of the vacuum insulated container 18. Therefore, the gas insulation layer composed of evaporating gas improves the insulation performance of the suction container 9. The remaining evaporated gas is discharged from the suction container 9 through the evaporated gas discharge pipe 37, which is connected to the pump chamber 30, and then through... Figure 1 The evaporated gas return pipeline 15 shown returns to the storage tank 1.

[0067] like Figure 3 As shown, the pump assembly 7 also includes a baffle structure 50. The baffle structure 50 is disposed within the suction container 9 (more specifically, within the vacuum-insulated container 18) and above the pump 10. The baffle structure 50 is located below the gas layer space L. In this embodiment, the baffle structure 50 is a baffle disposed between the pump 10 and the sealed structure 25. That is, the baffle structure 50 is located above the pump 10 and below the sealed structure 25. The baffle structure (baffle) 50 is fixed to the discharge pipe 33. The baffle structure 50 in this embodiment has a circular plate shape.

[0068] The baffle structure (baffle) 50 is positioned above the liquid level of the liquefied gas within the vacuum-insulated container 18. The outer edge of the baffle structure 50 is separated from the inner surface of the vacuum-insulated container 18 (i.e., it does not contact the inner surface of the vacuum-insulated container 18). Therefore, the evaporated gas generated within the pump chamber 30 moves through the gap between the baffle structure 50 and the inner surface of the vacuum-insulated container 18 into the gas layer space L, forming a gas insulation layer within the gas layer space L. In one embodiment, provided communication between the gas layer space L and the pump chamber 30 is established, a portion of the outer edge of the baffle structure 50 can contact the inner surface of the vacuum-insulated container 18.

[0069] During the operation of pump 10, the liquefied gas in suction container 9 flows at a relatively high speed. Therefore, the surface of the liquefied gas in suction container 9 sometimes fluctuates. Especially when conveying a large flow rate of liquefied gas, the liquefied gas may sometimes splash within suction container 9. The baffle structure 50 positioned below the gas layer space L can suppress the flow of fluid into the space filled with evaporated gas above the liquefied gas surface caused by the disturbance of the liquefied gas surface, thereby suppressing the impact on the gas insulation layer composed of evaporated gas within the gas layer space L, and preventing the gas insulation layer from becoming fluidized or convection-induced. The gas insulation layer composed of evaporated gas within the gas layer space L is preferably as still as possible. This is to prevent heat from outside suction container 9 from being transferred to the liquefied gas through convection of the evaporated gas within the gas layer space L.

[0070] The baffle structure 50 can suppress the flow or convection of the gas insulation layer caused by the disturbance of the liquid surface of the liquefied gas during the operation of the pump 10. As a result, the insulation effect of the gas insulation layer composed of the evaporated gas can be maintained.

[0071] Figure 4 This is an enlarged cross-sectional view showing another embodiment of the pump device 7. The structure and operation of this embodiment, unless otherwise specified, are referenced. Figures 1 to 3 The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0072] exist Figure 4 In the illustrated embodiment, the baffle structure 50 is a baffle fixed to the inner surface of the vacuum insulation container 18. In this embodiment, the vacuum insulation container 18 has a circular horizontal cross-section, and the baffle structure (baffle) 50 is annular. The baffle structure (baffle) 50 is disposed between the vacuum insulation cover 19 and the pump 10.

[0073] The inner edge of the baffle structure 50 is separated from the outer surface of the discharge pipe 33 (i.e., it does not contact the discharge pipe 33). Therefore, the gas layer space L is in communication with the pump chamber 30. In this embodiment, the baffle structure 50 also protects the gas insulation layer from the effects of liquefied gas turbulence that occurs when the pump 10 is operating, resulting in the maintenance of the insulation effect of the gas insulation layer composed of evaporated gas. In one embodiment, provided that the communication between the gas layer space L and the pump chamber 30 is established, a portion of the inner edge of the baffle structure 50 can contact the outer surface of the discharge pipe 33.

[0074] Figure 5 This is an enlarged cross-sectional view showing another embodiment of the pump device 7. The structure and operation of this embodiment, unless otherwise specified, are referenced. Figures 1 to 3 The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0075] exist Figure 5 In the illustrated embodiment, the baffle structure 50 is a labyrinth flow path structure forming a labyrinth flow path 53. In this example, the baffle structure 50 has a first flow path structure 51 fixed to the inner surface of the vacuum insulation container 18 and a second flow path structure 52 fixed to the sealed structure 25, with a labyrinth flow path 53 formed between the first flow path structure 51 and the second flow path structure 52. The gas layer space L and the pump chamber 30 are connected through the labyrinth flow path 53. The baffle structure (labyrinth flow path structure) 50 is disposed between the vacuum insulation cover 19 and the pump 10. The baffle structure 50 constituting the labyrinth flow path structure can protect the gas insulation layer from the turbulence of liquefied gas that occurs when the pump 10 is operating, thereby maintaining the insulation effect of the gas insulation layer composed of evaporated gas.

[0076] Figure 6 This is an enlarged cross-sectional view showing another embodiment of the pump device 7. The structure and operation of this embodiment, unless otherwise specified, are referenced. Figures 1 to 3 The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0077] exist Figure 6 In the illustrated embodiment, the baffle structure 50 is fixed to the sealed structure 25. The baffle structure 50 protrudes from the sealed structure 25 toward the inner surface of the vacuum insulation container 18. The outer edge of the baffle structure 50 is separated from the inner surface of the vacuum insulation container 18 (i.e., it does not contact the inner surface of the vacuum insulation container 18). Therefore, the evaporated gas generated in the pump chamber 30 moves into the gas layer space L through the gap between the baffle structure 50 and the inner surface of the vacuum insulation container 18, and forms a gas insulation layer in the gas layer space L. In one embodiment, provided that communication is established between the gas layer space L and the pump chamber 30, a portion of the outer edge of the baffle structure 50 can contact the inner surface of the vacuum insulation container 18.

[0078] exist Figure 6 In the illustrated embodiment, the baffle structure 50 is an annular component fixed to the bottom surface of the sealed structure 25. In one embodiment, the baffle structure 50 may also be an annular component fixed to the side surface of the sealed structure 25.

[0079] Figure 7 This is an enlarged cross-sectional view showing another embodiment of the pump device 7. The structure and operation of this embodiment, unless otherwise specified, are referenced. Figures 1 to 3 The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0080] exist Figure 7 In the illustrated embodiment, the baffle structure 50 is a baffle positioned below the liquid level of the liquefied gas within the vacuum insulation container 18. That is, the baffle structure (i.e., the baffle) 50 is fixed to the discharge pipe 33 and disposed within the liquefied gas inside the vacuum insulation container 18. This baffle structure (baffle) 50 enables the liquid level of the liquefied gas within the vacuum insulation container 18 to remain stagnant. As a result, the insulation effect of the gas insulation layer composed of evaporated gas can be maintained.

[0081] Figure 8 This is an enlarged cross-sectional view showing another embodiment of the pump device 7. The structure and operation of this embodiment, unless otherwise specified, are referenced. Figure 4 The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0082] exist Figure 8 In the illustrated embodiment, the baffle structure 50 is a baffle positioned below the liquid level of the liquefied gas within the vacuum insulation container 18. That is, the baffle structure (baffle) 50 is fixed to the inner surface of the vacuum insulation container 18 and disposed within the liquefied gas inside the vacuum insulation container 18. This baffle structure (baffle) 50 enables the liquid level of the liquefied gas within the vacuum insulation container 18 to remain stagnant. As a result, the insulation effect of the gas insulation layer composed of evaporated gas can be maintained.

[0083] Figure 9 This is an enlarged cross-sectional view showing another embodiment of the pump device 7. The structure and operation of this embodiment, unless otherwise specified, are referenced. Figure 3 The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0084] exist Figure 9In the illustrated embodiment, a vacuum is created inside the sealed structure 25 by the sidewall 61, upper wall 62, and upper bottom wall 60. The upper bottom wall 60 is located higher than the lower end of the sidewall 61. More specifically, the upper bottom wall 60 is located at the same height as the flange 26. The sidewall 61 has a portion 61a extending downward from the upper bottom wall 60, and an air layer space L is formed between the outer surface of this downwardly extending portion 61a and the inner surface of the inner wall 22A of the vacuum insulation container 18. An evaporation gas discharge pipe 37 communicating with the pump chamber 30 extends through the vacuum insulation cover 19. The evaporation gas inlet 37a of the evaporation gas discharge pipe 37 is located lower than the air layer space L and higher than the suction port 40.

[0085] Figure 10 express Figure 9 A variation of the illustrated embodiment. In this variation, the upper bottom wall 60 of the sealed structure 25 is located lower than the flange 26 and higher than the lower end of the side wall 61. Other structures are similar. Figure 9 The implementation method shown is the same. Figure 9 and Figure 10 The sealed structure 25 of the illustrated embodiment can also be applied to the reference embodiment. Figures 4 to 7 The implementation method described.

[0086] Figure 11 This is an enlarged cross-sectional view showing another embodiment of the pump device 7. The structure and operation of this embodiment, unless otherwise specified, are referenced. Figures 1 to 3 The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0087] In this embodiment, the baffle structure 50 of the above embodiments is not provided. Instead, the evaporating gas discharge pipe 37 passes through the side wall of the vacuum insulated container 18 and is connected thereto. The suction port 40 is connected to the side wall of the vacuum insulated container 18 at a position lower than the evaporating gas discharge pipe 37. The connection position between the evaporating gas discharge pipe 37 and the side wall of the vacuum insulated container 18 is lower than the gas layer space L. It should be noted that the baffle structure 50 of the above embodiments can also be disposed in a liquid or a gas. Even if the evaporating gas discharge pipe 37 and the baffle structure 50 of this embodiment are combined, the purpose of this embodiment can be achieved.

[0088] The evaporation gas exhaust pipe 37 is not located on the vacuum insulation cover 19. The vacuum insulation cover 19 seals the upper opening of the vacuum insulation container 18 and forms a dead-end space D in the upper part of the vacuum insulation container 18, preventing gas from flowing out. The dead-end space D is surrounded by the inner surface of the inner wall 22A of the vacuum insulation container 18, the side surface 25a and bottom surface 25b of the sealed structure 25, and the lower surface of the flange 26. Therefore, the gas layer space L constitutes a part of the dead-end space D.

[0089] The evaporation gas discharge pipe 37 opens inside the suction container 9 at a position lower than the gas layer space L. The evaporation gas discharge pipe 37 has a first pipe 37A connected to the side wall of the vacuum insulated container 18, and a second pipe 37B extending upward from the first pipe 37A. The first pipe 37A extends laterally, and the second pipe 37B extends longitudinally. The connection point between the first pipe 37A and the side wall of the vacuum insulated container 18 is located between the suction port 40 and the gas layer space L. The evaporation gas discharge pipe 37 and... Figure 1 The evaporated gas return line 15 shown is connected.

[0090] exist Figure 11 In the vacuum insulated container 18, the liquefied gas level is lower than the connection point between the evaporator exhaust pipe 37 and the side wall of the vacuum insulated container 18. During the operation of the pump 10, the liquefied gas level may sometimes rise sharply. For example... Figure 12 As shown, when the liquefied gas level rises, the evaporation gas discharge pipe 37 causes a portion of the liquefied gas to escape from the vacuum insulated container 18. On the other hand, since the dead-end space D above the location where the evaporation gas discharge pipe 37 is connected to the intake container 9 is sealed by the vacuum insulated cover 19 and the vacuum insulated container 18, the pressure in this dead-end space D increases as the liquefied gas level rises, and the liquefied gas level is repelled by the pressure in the dead-end space D, thus hindering its rise. Therefore, the liquefied gas level will not rise above the connection point of the evaporation gas discharge pipe 37 within the intake container 9. Therefore, it is possible to prevent the liquefied gas level from approaching the gas insulation layer composed of evaporation gas existing within the gas layer space L. As a result, it is possible to prevent the gas insulation layer within the gas layer space L from flowing or convection, thereby maintaining the insulation effect of the gas insulation layer composed of evaporation gas.

[0091] Furthermore, the amount of heat input to the liquid surface caused by heat conduction from the room-temperature region above the inner wall 22A of the vacuum double-insulated suction container 9 can be kept constant. This is because, since the liquid surface does not rise from the position of the first tube 37A and the thickness of the gas insulation layer in the dead-end space D remains constant, the heat transfer distance from the upper room-temperature region to the liquid surface can be kept constant. Therefore, the amount of heat transfer is constant, and an increase in heat transfer can be suppressed.

[0092] like Figure 12 As shown, the liquefied gas rises to a certain height within the longitudinally extending second pipe 37B, but does not flow above that height. The dead-end space D formed within the vacuum insulated container 18 makes it difficult for the liquid level of the liquefied gas within the vacuum insulated container 18 to rise.

[0093] Figure 13 This is an enlarged cross-sectional view showing another embodiment of the pump device 7. The structure and operation of this embodiment, unless otherwise specified, are referenced. Figure 11The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0094] The evaporation gas discharge pipe 37 extends through the vacuum insulation cover 19 and protrudes downward from the bottom surface 25b of the vacuum insulation cover 19. More specifically, the evaporation gas discharge pipe 37 extends longitudinally through the sealed structure 25 that forms a vacuum inside, and has a lower end opening 38 located below the gas layer space L. Therefore, the evaporation gas discharge pipe 37 opens into the suction container 9 at a position lower than the gas layer space L.

[0095] like Figure 14 As shown, when the liquefied gas level rises, the evaporation gas discharge pipe 37 causes a portion of the liquefied gas to escape from the intake container 9. On the other hand, since the dead-end space D above the lower opening 38 of the evaporation gas discharge pipe 37 is sealed by the vacuum insulation cover 19 and the vacuum insulation container 18, the pressure in this dead-end space D increases as the liquefied gas level rises, and the liquefied gas level is repelled by the pressure in the dead-end space D, thus hindering its rise. Therefore, the liquefied gas level will not rise above the lower opening 38 of the evaporation gas discharge pipe 37 within the intake container 9. The dead-end space D formed within the intake container 9 makes it difficult for the liquefied gas level in the intake container 9 to rise.

[0096] Figures 11 to 14 The vacuum insulated container 18 shown is one embodiment of an insulated container having a double-walled structure that creates a vacuum inside, but the insulated container is not limited to the vacuum insulated container 18. In one embodiment, such as Figure 15 As shown, the suction container 9 can also have an insulated container 60 with a single-wall structure instead of a vacuum insulated container 18 with a double-wall structure. The flange 26 of the vacuum insulated cover 19 is detachably fixed to the upper end of the insulated container 60 by fasteners such as screws (not shown). The suction port 40 is connected to the side wall of the insulated container 60. Although not shown, Figure 15 The embodiment of the insulated container 60 with a single-wall structure shown can also be applied to the reference Figure 13 and Figure 14 The described implementation method. Further detailed structure of the inhalation container 9 is shown in the reference. Figures 1 to 14 The implementation methods described are the same, therefore, repeated descriptions are omitted.

[0097] Reference Figures 1 to 15 The described embodiment represents a pump device for pressurizing liquefied gas, but reference is made to... Figures 1 to 15 The described implementation method is not limited to pump devices, but can also be applied to turbine power generation devices that utilize the fluid energy of liquefied gas to generate electricity.

[0098] Figure 16 This is a schematic diagram illustrating one embodiment of a turbine power generation device. (Regarding...) Figure 2The same components shown in the embodiments are labeled with the same reference numerals, and repeated descriptions thereof are omitted. The turbine power generation device 80 includes an intake container 9 and a turbine 81 disposed within the intake container 9. The turbine 81 is disposed within a turbine chamber 82 formed within the intake container 9. The air layer space L communicates with the turbine chamber 82.

[0099] The turbine 81 includes: a generator 84 having a rotor 84A and a stator 84B; a rotating shaft 86 connected to the generator 84; a plurality of bearings 88 rotatably supporting the rotating shaft 86; a plurality of impellers 90 fixed to the rotating shaft 86; and a turbine housing 91 accommodating the plurality of impellers 90. In one embodiment, the turbine 81 may also have a single impeller 90.

[0100] High-pressure liquefied gas is introduced into the suction container 9 through the suction port 40. During the operation of the turbine 81, the turbine 81 is entirely immersed in the liquefied gas. Therefore, the turbine 81 is a submersible turbine capable of operating in liquefied gas. High-pressure liquefied gas flows into the turbine 81 from the fluid inlet 92 formed on the side wall of the turbine housing 91, causing multiple impellers 90 to rotate. The rotation of the impellers 90 causes the generator 84 to rotate via the rotating shaft 86, thereby generating electricity. The liquefied gas is depressurized while passing through the multiple impellers 90. Moreover, the low-pressure liquefied gas flows out from the turbine 81's outlet 93 and into the discharge pipe 33, where it flows.

[0101] Although repeated illustrations are omitted, refer to Figures 2 to 14 The described implementation is applicable to the turbine generator 80. In this case, Figures 2 to 14 Pump 10 is replaced with turbine 81, pump chamber 30 is replaced with turbine chamber 82, and discharge outlet 31 is replaced with discharge outlet 93. Further, refer to... Figure 15 The described embodiment of the heat insulation container 60 is applicable to Figures 11 to 14 The embodiment shown is combined with turbine 81.

[0102] The above embodiments are described with the aim of enabling those skilled in the art to implement the present invention. Those skilled in the art will naturally be able to implement various modifications of the above embodiments, and the technical concept of the present invention can also be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments and can be interpreted as following the maximum scope of the technical concept defined by the claims.

[0103] Industrial applicability

[0104] This invention can be used in pump devices for conveying liquefied gases such as liquid hydrogen, liquid nitrogen, liquid ammonia, liquefied natural gas, liquefied ethylene gas, and liquefied petroleum gas, as well as in turbine power generation devices used in liquefied gas liquefaction equipment.

[0105] Explanation of reference numerals in the attached figures

[0106] 1 Storage tank

[0107] 2 Pump Column

[0108] 3. In-tank pump

[0109] 5. Liquefied gas transmission pipeline

[0110] 7. Pump Unit

[0111] 9 suction container

[0112] 10 pumps

[0113] 15 Evaporated gas return pipeline

[0114] 18 Vacuum Insulated Container

[0115] 19 Vacuum Insulated Cover

[0116] 22A Inner Wall

[0117] 22B outer wall

[0118] 25. Enclosed Structure

[0119] 26 Flange

[0120] 30 Pump Room

[0121] 31 Discharge outlet

[0122] 33 Discharge pipe

[0123] 37 Evaporated gas discharge pipe

[0124] 37A Pipe No. 1

[0125] 37B Pipe No. 2

[0126] 38. Open at the bottom

[0127] 40 Suction Port

[0128] 41A motor rotor

[0129] 41B Motor Stator

[0130] 41 Electric motor

[0131] 42 Rotation axis

[0132] 44 bearings

[0133] 45 Impeller

[0134] 46 Pump casing

[0135] 50 baffle structure

[0136] 51 First Flow Path Structure

[0137] 52 Second Flow Path Structure

[0138] 53 Maze Path

[0139] 60 Insulated Container

[0140] 80 Turbine power generation unit

[0141] 81 Turbine

[0142] 82 Turbine Chamber

[0143] 84 Generator

[0144] 86 Rotation axis

[0145] 88 bearing

[0146] 90 Impeller

[0147] 91 Turbine Housing

[0148] 92 fluid inlet

[0149] 93 Discharge outlet

[0150] L-shaped air space

[0151] D. Dead space.

Claims

1. A pumping device for conveying liquefied gas, characterized in that, It includes a suction container and a pump disposed within the suction container. The inhalation container has: A vacuum-insulated container having a double-walled structure that creates an internal vacuum; and Vacuum insulation cover, which has a sealed structure that creates an internal vacuum. The pump is configured in a pump chamber formed by the vacuum-insulated container and the vacuum-insulated cover. A gas layer space is formed between the inner surface of the vacuum insulation container and the outer surface of the sealed structure for forming a gas insulation layer composed of evaporated gas. The gas layer space is connected to the pump chamber.

2. The pump device according to claim 1, characterized in that, It also includes a baffle structure disposed inside the suction container and above the pump.

3. The pump device according to claim 2, characterized in that, The baffle structure is disposed between the vacuum insulation cover and the pump.

4. The pump device according to claim 2, characterized in that, The baffle structure is a baffle disposed between the pump and the sealed structure.

5. The pump device according to claim 4, characterized in that, The pump assembly also includes a discharge pipe, which is connected to the pump's outlet and extends through the vacuum insulation cover. The baffle is fixed to the discharge pipe.

6. The pump device according to claim 4, characterized in that, The baffle is fixed to the inner surface of the vacuum insulation container.

7. The pump device according to claim 4, characterized in that, The baffle is positioned above the liquid level of the liquefied gas inside the vacuum insulated container.

8. The pump device according to claim 4, characterized in that, The baffle is located below the liquid level of the liquefied gas inside the vacuum insulated container.

9. The pump device according to claim 2, characterized in that, The baffle structure is fixed to the sealed structure.

10. The pump device according to claim 2, characterized in that, The baffle structure is a labyrinth flow path structure that forms a labyrinth flow path.

11. A pumping device for conveying liquefied gas, characterized in that, have: A suction container with a suction port; A pump configured within the suction container; and The evaporation gas discharge pipe connected to the inhalation container, The inhalation container has an insulated container and a vacuum-insulated cover with a sealed structure that creates an internal vacuum. The pump is configured in a pump chamber formed by the insulated container and the vacuum insulated cover. A gas layer space is formed between the inner surface of the insulating container and the outer surface of the sealed structure for forming a gas insulating layer composed of evaporated gas. The gas layer space is connected to the pump chamber. The evaporation gas discharge pipe opens inside the inhalation container at a position lower than the gas layer space.

12. The pump device according to claim 11, characterized in that, The evaporation gas discharge pipe is connected to the side wall of the insulation container at a position lower than the gas layer space.

13. The pump device according to claim 11, characterized in that, The evaporative gas discharge pipe has a first pipe connected to the side wall of the insulated container at a position between the intake port and the gas layer space, and a second pipe extending upward from the first pipe.

14. The pump device according to claim 11, characterized in that, The vacuum insulation cover seals the upper opening of the insulation container and forms a dead-end space at the upper part of the insulation container that prevents gas from flowing out.

15. The pump device according to claim 11, characterized in that, The evaporation gas discharge pipe passes through the vacuum insulation cover and protrudes downward from the bottom surface of the vacuum insulation cover.

16. The pump device according to claim 11, characterized in that, The insulated container is a vacuum insulated container with a double-walled structure that creates a vacuum inside.

17. A turbine power generation device that generates electricity using the fluid energy of liquefied gas, characterized in that, It includes an inhalation container and a turbine disposed within the inhalation container. The inhalation container has: A vacuum-insulated container having a double-walled structure that creates an internal vacuum; and Vacuum insulation cover, which has a sealed structure that creates an internal vacuum. The turbine is configured in a turbine chamber formed by the vacuum-insulated container and the vacuum-insulated cover. A gas layer space is formed between the inner surface of the vacuum insulation container and the outer surface of the sealed structure for forming a gas insulation layer composed of evaporated gas. The gas layer space is connected to the turbine chamber.

18. The turbine power generation device according to claim 17, characterized in that, It also includes a baffle structure disposed inside the intake container and above the turbine.

19. The turbine power generation device according to claim 18, characterized in that, The baffle structure is disposed between the vacuum insulation cover and the turbine.

20. The turbine power generation device according to claim 18, characterized in that, The baffle structure is a baffle disposed between the turbine and the sealed structure.

21. The turbine power generation device according to claim 20, characterized in that, The turbine power generation device also includes a discharge pipe, which is connected to the turbine's outlet and extends through the vacuum insulation cover. The baffle is fixed to the discharge pipe.

22. The turbine power generation device according to claim 20, characterized in that, The baffle is fixed to the inner surface of the vacuum insulation container.

23. The turbine power generation device according to claim 20, characterized in that, The baffle is positioned above the liquid level of the liquefied gas inside the vacuum insulated container.

24. The turbine power generation device according to claim 20, characterized in that, The baffle is located below the liquid level of the liquefied gas inside the vacuum insulated container.

25. The turbine power generation device according to claim 18, characterized in that, The baffle structure is fixed to the sealed structure.

26. The turbine power generation device according to claim 18, characterized in that, The baffle structure is a labyrinth flow path structure that forms a labyrinth flow path.

27. A turbine power generation device that generates electricity using the fluid energy of liquefied gas, characterized in that it comprises: A suction container with a suction port; A turbine configured within the inhalation container; and The evaporation gas discharge pipe connected to the inhalation container, The inhalation container has an insulated container and a vacuum-insulated cover with a sealed structure that creates an internal vacuum. The turbine is configured in a turbine chamber formed by the heat-insulating container and the vacuum heat-insulating cover. A gas layer space is formed between the inner surface of the insulating container and the outer surface of the sealed structure for forming a gas insulating layer composed of evaporated gas. The gas layer space is connected to the turbine chamber. The evaporation gas discharge pipe opens inside the inhalation container at a position lower than the gas layer space.

28. The turbine power generation device according to claim 27, characterized in that, The evaporation gas discharge pipe is connected to the side wall of the insulation container at a position lower than the gas layer space.

29. The turbine power generation device according to claim 27, characterized in that, The evaporative gas discharge pipe has a first pipe connected to the side wall of the insulated container and positioned between the intake port and the gas layer space, and a second pipe extending upward from the first pipe.

30. The turbine power generation device according to claim 27, characterized in that, The vacuum insulation cover seals the upper opening of the insulation container and forms a dead-end space at the upper part of the insulation container that prevents gas from flowing out.

31. The turbine power generation device according to claim 27, characterized in that, The evaporation gas discharge pipe passes through the vacuum insulation cover and protrudes downward from the bottom surface of the vacuum insulation cover.

32. The turbine power generation device according to claim 27, characterized in that, The insulated container is a vacuum insulated container with a double-walled structure that creates a vacuum inside.

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