Passive gas supply and cooling system

Abstract

The application discloses a kind of non-powered gas supply cooling system, comprising: cryogenic liquefied gas storage tank device, outdoor vaporization device, indoor vaporization device, first pipeline, second pipeline, first valve being arranged on first pipeline, second valve being arranged on second pipeline, third pipeline, fourth pipeline, cryogenic liquefied gas storage tank device is connected with outdoor vaporization device by first pipeline, and outdoor vaporization device is connected with gas user by third pipeline;Cryogenic liquefied gas storage tank device is connected with indoor vaporization device by second pipeline, and indoor vaporization device is arranged in the room needing to supply cold, and second valve is located outside the room needing to supply cold, and indoor vaporization device is connected with third pipeline by fourth pipeline.The system couples cryogenic liquefied gas vaporization gas supply and cooling, while meeting the gas supply in industrial plant, and can be used for emergency cooling of industrial plant when ventilation system fails.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of nuclear power, and particularly relates to a non-active gas supply and cooling system. BACKGROUND

[0002] In the normal working condition of the previous nuclear power or thermal power plant, the main function of the gas system (such as the nitrogen system) is to provide corresponding gas for the user, and the gas is usually supplied by reducing the pressure of the gas cylinder or vaporizing the low-temperature liquefied gas and then reducing the pressure. When the ventilation system fails, the low-temperature liquefied gas vaporization method can be used for emergency cooling of important rooms. However, the probability of accidents is extremely low, and the medium in the low-temperature liquefied gas storage container is continuously lost due to vaporization during storage. In order to ensure that there is enough low-temperature liquefied gas in the container for emergency cooling in the event of an accident, the low-temperature liquefied gas must be continuously supplemented on a daily basis, resulting in a large amount of waste of low-temperature liquefied gas. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a non-active gas supply and cooling system which couples the low-temperature liquefied gas vaporization gas supply and cooling, and can be used for emergency cooling of industrial plants when the ventilation system fails while meeting the gas supply of industrial plants.

[0004] The technical solution adopted to solve the technical problem of the present application is to provide a non-active gas supply and cooling system, comprising: a low-temperature liquefied gas storage tank device, an outdoor vaporization device, an indoor vaporization device, a first pipeline, a second pipeline, a first valve provided on the first pipeline, a second valve provided on the second pipeline, a third pipeline, a fourth pipeline,

[0005] The low-temperature liquefied gas storage tank device is connected to the outdoor vaporization device through the first pipeline, the outdoor vaporization device is connected to the gas user through the third pipeline, and the gas vaporized by the outdoor vaporization device is supplied to the gas user through the third pipeline;

[0006] The low-temperature liquefied gas storage tank device is connected to the indoor vaporization device through the second pipeline, the indoor vaporization device is arranged in the room requiring cooling, the second valve is located outside the room requiring cooling, the indoor vaporization device is connected to the third pipeline through the fourth pipeline, and the gas vaporized by the indoor vaporization device is supplied to the room requiring cooling through the second pipeline.

[0007] Preferably, the non-active gas supply and cooling system further comprises: a fifth pipeline, a fifth valve arranged on the fifth pipeline, a first pressure regulating device arranged on the third pipeline, the indoor vaporization device is connected with the fifth pipeline, the fifth pipeline outlet is connected with the high altitude, the outdoor vaporization device is connected with the fifth pipeline through the fourth pipeline, the fifth valve is closer to the fifth pipeline outlet than the connection between the fourth pipeline and the fifth pipeline, and the first pressure regulating device is closer to the gas user than the connection between the fourth pipeline and the third pipeline.

[0008] Preferably, the non-active gas supply and cooling system further comprises: a temperature detection device arranged in the room needing to be cooled, the temperature detection device is connected with the first valve and the second valve, and when the temperature detection device detects that the room needing to be cooled exceeds the preset temperature, the first valve is controlled to be closed and the second valve is controlled to be opened in interlocking.

[0009] Preferably, the non-active gas supply and cooling system further comprises: an alarm device, the alarm device is connected with the temperature detection device, and when the temperature detection device detects that the room needing to be cooled exceeds the preset temperature, the alarm device is controlled to alarm in interlocking.

[0010] Preferably, the low-temperature liquefied gas storage tank device comprises: a low-temperature liquefied gas storage tank, a sixth pipeline, a second pressure regulating device arranged on the sixth pipeline, a vaporizer arranged on the sixth pipeline, a seventh pipeline, a third pressure regulating device arranged on the seventh pipeline, and an eighth pipeline, one end of the seventh pipeline is communicated with the liquid in the low-temperature liquefied storage tank, the other end of the seventh pipeline is connected with one end of the eighth pipeline, the other end of the eighth pipeline is communicated with the gas in the low-temperature liquefied storage tank, one end of the sixth pipeline is communicated with the liquid in the low-temperature liquefied storage tank, the other end of the sixth pipeline is connected with the eighth pipeline, the second pressure regulating device is closer to the liquid end of the low-temperature liquefied storage tank than the vaporizer on the sixth pipeline, and the connection point of the sixth pipeline and the eighth pipeline is closer to the gas end of the low-temperature liquefied storage tank than the connection point of the seventh pipeline and the eighth pipeline.

[0011] Preferably, the low-temperature liquefied gas storage tank is a vacuum heat-insulated double-layer insulation tank body, and the interlayer of the tank body is vacuum.

[0012] Preferably, the outdoor vaporization device is an outdoor air bath type vaporizer, and the indoor vaporization device is an indoor air bath type vaporizer.

[0013] Preferably, the medium stored by the low-temperature liquefied gas storage tank device is any one of liquid nitrogen, liquid carbon dioxide and liquid helium.

[0014] Preferably, the low-temperature liquefied gas storage tank device has two sets, one of which is a low-temperature liquefied gas storage tank device in use, and the other of which is a low-temperature liquefied gas storage tank device for standby.

[0015] Preferably, the non-active gas supply and cooling system further comprises a ninth pipeline and a ninth valve arranged on the ninth pipeline, one end of the ninth pipeline is connected with the first pipeline, the other end of the ninth pipeline is connected with the second pipeline, the low-temperature liquefied gas storage device in use is connected with the outdoor vaporization device through the first pipeline, the low-temperature liquefied gas storage device in use is connected with the indoor vaporization device through the second pipeline, the second valve is closer to the indoor vaporization device than the connection of the ninth pipeline and the second pipeline, the low-temperature liquefied gas storage device in standby is connected with the indoor vaporization device through the second pipeline, the low-temperature liquefied gas storage device in standby is connected with the outdoor vaporization device through the ninth pipeline, and the first valve is closer to the outdoor vaporization device than the connection of the ninth pipeline and the first pipeline.

[0016] Compared with the non-active emergency cooling system only having an emergency cooling function, the non-active gas supply and cooling system improves the utilization rate of the system, equipment and medium, the low-temperature liquefied gas storage device is not placed for a long time, the loss of low-temperature liquefied gas due to heat leakage does not need to be considered, and the volume of the low-temperature liquefied gas storage device is reduced. The non-active gas supply and cooling system realizes gas and heat supply by coupling gas supply and cooling supply, ensures normal gas supply, guarantees emergency cooling in the case of failure of the normal ventilation system of the industrial plant, realizes gas and heat supply, and saves energy. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of the non-active gas supply and cooling system in Embodiment 2 of the present application.

[0018] In the figure, 1 is an outdoor vaporization device, 2 is an indoor vaporization device, 3 is a first pipeline, 4 is a second pipeline, 5 is a first valve, 6 is a second valve, 7 is a third pipeline, 8 is a fourth pipeline, 9 is a fifth pipeline, 10 is a fifth valve, 11 is a first pressure regulating device, 12 is a temperature detection device, 13 is a heat source, 14 is a low-temperature liquefied gas storage tank, 15 is a sixth pipeline, 16 is a second pressure regulating device, 17 is a vaporizer, 18 is a seventh pipeline, 19 is a third pressure regulating device, 20 is an eighth pipeline, 21 is a ninth pipeline, 22 is a ninth valve, 23 is a room needing cooling supply, 24 is a low-temperature liquefied gas storage device in use, and 25 is a low-temperature liquefied gas storage device in standby. DETAILED DESCRIPTION

[0019] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0020] Embodiments of the present patent are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, for the purpose of explanation, and are not to be understood as limiting the present patent.

[0021] Embodiment 1

[0022] The present embodiment provides a non-active gas supply and cooling system, comprising: a low-temperature liquefied gas storage device, an outdoor vaporization device, an indoor vaporization device, a first pipeline, a second pipeline, a first valve arranged on the first pipeline, a second valve arranged on the second pipeline, a third pipeline, a fourth pipeline,

[0023] The low-temperature liquefied gas storage device is connected with the outdoor vaporization device through the first pipeline, the outdoor vaporization device is connected with the gas user through the third pipeline, and the gas vaporized by the outdoor vaporization device is supplied to the gas user through the third pipeline.

[0024] The low-temperature liquefied gas storage device is connected with the indoor vaporization device through the second pipeline, the indoor vaporization device is arranged in a room requiring cooling, the second valve is located outside the room requiring cooling, the indoor vaporization device is connected with the third pipeline through the fourth pipeline, and the gas vaporized by the indoor vaporization device is supplied to the room requiring cooling through the second pipeline.

[0025] Compared with the non-active emergency cooling system only having the emergency cooling function, the non-active gas supply and cooling system in the present embodiment improves the utilization rate of the system, equipment and medium, the low-temperature liquefied gas storage device is no longer placed for a long time, the loss of low-temperature liquefied gas due to heat leakage does not have to be considered, and the volume of the low-temperature liquefied gas storage device is reduced. The non-active gas supply and cooling system couples gas supply and cooling supply, which not only ensures normal gas supply, but also ensures emergency cooling in the case of failure of the normal ventilation system of the industrial plant, realizes gas and heat combined supply, and saves energy.

[0026] Embodiment 2

[0027] As shown in Figure 1 The present embodiment provides a non-active gas supply and cooling system, comprising: a low-temperature liquefied gas storage device, an outdoor vaporization device 1, an indoor vaporization device 2, a first pipeline 3, a second pipeline 4, a first valve 5 arranged on the first pipeline 3, a second valve 6 arranged on the second pipeline 4, a third pipeline 7, a fourth pipeline 8,

[0028] The low-temperature liquefied gas storage device is connected with the outdoor vaporization device 1 through the first pipeline 3, the outdoor vaporization device 1 is connected with the gas user through the third pipeline 7, and the gas vaporized by the outdoor vaporization device 1 is supplied to the gas user through the third pipeline 7.

[0029] The low-temperature liquefied gas storage tank device is connected with the indoor vaporization device 2 through the second pipeline 4, the indoor vaporization device 2 is arranged in the room 23 needing to be cooled, the second valve 6 is located outside the room 23 needing to be cooled, the indoor vaporization device 2 is connected with the third pipeline 7 through the fourth pipeline 8, and the gas vaporized through the indoor vaporization device 2 is supplied to the room 23 needing to be cooled through the second pipeline 4.

[0030] Preferably, the passive gas supply and cooling system further comprises: a fifth pipeline 9, a fifth valve 10 arranged on the fifth pipeline 9, and a first pressure regulating device 11 arranged on the third pipeline 7, the indoor vaporization device 2 is connected with the fifth pipeline 9, the outlet of the fifth pipeline 9 is connected to a high altitude, the outdoor vaporization device 1 is connected with the fifth pipeline 9 through the fourth pipeline 8, the fifth valve 10 is closer to the outlet of the fifth pipeline 9 than the connection between the fourth pipeline 8 and the fifth pipeline 9, and the first pressure regulating device 11 is closer to the gas user than the connection between the fourth pipeline 8 and the third pipeline 7.

[0031] Preferably, the passive gas supply and cooling system further comprises: a temperature detection device 12 arranged in the room 23 needing to be cooled, the temperature detection device 12 is connected with the first valve 5 and the second valve 6, and when the temperature detection device 12 detects that the room 23 needing to be cooled exceeds a preset temperature, the first valve 5 is controlled to be closed and the second valve 6 is controlled to be opened in a chained manner. Specifically, the temperature detection device 12 in the embodiment is a temperature sensor.

[0032] Preferably, the passive gas supply and cooling system further comprises: an alarm device, the alarm device is connected with the temperature detection device 12, and when the temperature detection device 12 detects that the room 23 needing to be cooled exceeds a preset temperature, the alarm device is controlled to alarm in a chained manner.

[0033] Preferably, the low-temperature liquefied gas storage tank device comprises: a low-temperature liquefied gas storage tank 14, a sixth pipeline 15, a second pressure regulating device 16 arranged on the sixth pipeline 15, a vaporizer 17 arranged on the sixth pipeline 15, a seventh pipeline 18, a third pressure regulating device 19 arranged on the seventh pipeline 18, and an eighth pipeline 20, one end of the seventh pipeline 18 is communicated with liquid in the low-temperature liquefied storage tank 14, the other end of the seventh pipeline 18 is connected with one end of the eighth pipeline 20, the other end of the eighth pipeline 20 is communicated with gas in the low-temperature liquefied storage tank 14, one end of the sixth pipeline 15 is communicated with liquid in the low-temperature liquefied storage tank 14, the other end of the sixth pipeline 15 is connected with the eighth pipeline 20, the second pressure regulating device 16 is closer to the liquid end of the low-temperature liquefied storage tank 14 than the vaporizer 17 on the sixth pipeline 15, and the connection point of the sixth pipeline 15 and the eighth pipeline 20 is closer to the gas end of the low-temperature liquefied storage tank 14 than the connection point of the seventh pipeline 18 and the eighth pipeline 20.

[0034] Preferably, the low-temperature liquefied gas tank 14 is a vacuum-insulated double-layer insulation tank body, and the interlayer of the tank body is vacuum. The vacuum-insulated low-temperature liquefied gas tank 14 is placed outdoors, adopts a double-layer tank body, and the interlayer is vacuum-insulated to ensure that the medium in the tank maintains a low temperature, and the self-contained vaporizer 17 and the self-contained pressure regulating system are used to ensure that the pressure of the medium in the tank is constant.

[0035] Preferably, the outdoor vaporization device 1 is an outdoor air bath type vaporizer, and the indoor vaporization device 2 is an indoor air bath type vaporizer.

[0036] Preferably, the medium stored in the low-temperature liquefied gas tank device is any one of liquid nitrogen, liquid carbon dioxide, and liquid helium. These media are low-temperature liquefied gases, and these low-temperature liquefied gases have the common characteristic that a large amount of heat is absorbed during vaporization, and most of them are suffocating. If there is no user demand, the risk of suffocation of personnel can be avoided by high-altitude discharge.

[0037] Preferably, the low-temperature liquefied gas tank device is two sets, one of which is a low-temperature liquefied gas tank device 24 in use, and the other is a low-temperature liquefied gas tank device 25 for backup.

[0038] Preferably, the non-active gas supply and cooling system further comprises a ninth pipeline 21 and a ninth valve 22 arranged on the ninth pipeline 21. One end of the ninth pipeline 21 is connected with the first pipeline 3, and the other end of the ninth pipeline 21 is connected with the second pipeline 4. The low-temperature liquefied gas tank device 24 in use is connected with the outdoor vaporization device 1 through the first pipeline 3, and is connected with the indoor vaporization device 2 through the second pipeline 4. The second valve 6 is closer to the indoor vaporization device 2 than the connection between the ninth pipeline 21 and the second pipeline 4. The low-temperature liquefied gas tank device 25 for backup is connected with the indoor vaporization device 2 through the second pipeline 4, and is connected with the outdoor vaporization device 1 through the ninth pipeline 21. The first valve 5 is closer to the outdoor vaporization device 1 than the connection between the ninth pipeline 21 and the first pipeline 3.

[0039] When the low-temperature liquefied gas tank 14 in use appears a low liquid level alarm, the switching between the working column and the backup column is realized through the ninth valve 22, and the low-temperature liquefied gas is supplemented to the low-temperature liquefied gas tank 14 in alarm in time, so that the liquid supplementing and gas supply are achieved at the same time, and the availability under emergency accident conditions is ensured at any time.

[0040] The volume of the vacuum-insulated low-temperature liquefied gas tank 14 is increased in direct proportion to the heat amount of the heat source 13 in the room 23 to be cooled, and the number of rooms to be cooled can be determined according to the volume of the low-temperature liquefied gas tank 14. Specifically, the rooms 23 to be cooled in the embodiment include two rooms 23A and 23B, and each of the rooms is provided with the indoor vaporization device 2 and connected to the low-temperature liquefied gas tank device.

[0041] The outdoor always-open low-temperature control first valve 5 is arranged on the first pipeline 3 at the inlet of the outdoor air-bath vaporizer 17, and normally, the first valve 5 is in an open state. The low-temperature liquefied gas stored in the vacuum-insulated low-temperature liquefied gas tank 14 is exchanged with outdoor air through the outdoor air-bath vaporizer, vaporized into gas, and then supplied to the gas user through the first pressure regulating device 11, thereby realizing the normal gas supply function of the system.

[0042] If the normal ventilation system of the room 23A to be cooled fails, the heat source 13 in the room 23A to be cooled continuously generates heat, and the temperature detection device 12 arranged in the room 23A to be cooled detects that the temperature of the room 23A to be cooled is too high. The indoor always-closed low-temperature control second valve 6 arranged at the inlet of the indoor vaporization device 2 and the outdoor always-closed low-temperature control ninth valve 22 arranged at the ninth pipeline 21 are opened in interlocking, and the outdoor always-open first valve 5 arranged at the first pipeline 3 at the inlet of the outdoor vaporization device 1 is closed. The low-temperature liquefied gas stored in the vacuum-insulated low-temperature liquefied gas tank 14 is exchanged with air through the opened low-temperature control ninth valve 22 and the low-temperature control second valve 6, vaporized into gas, and then supplied to the gas user through the first pressure regulating device 11, and the always-closed fifth valve 10 is opened to discharge the gas to a high altitude. Thus, the emergency cooling function of the system is realized, and the gas supply under the accident condition is ensured.

[0043] The outdoor always-open low-temperature control first valve 5, the outdoor always-closed low-temperature control ninth valve 22, the indoor always-closed low-temperature control second valve 6, and the always-closed gas control fifth valve 10 can be manually controlled or controlled by a room controller, and the power supply is a storage battery, which is only powered under the accident condition.

[0044] The indoor air-bath vaporizer is a high-efficiency vaporizer, which is in the form of a high-efficiency heat exchange pipe and has the characteristics of high integration, modularity and miniaturization, and has a very high heat exchange efficiency and is convenient to arrange.

[0045] The indoor air bath type vaporizer is a high-efficiency vaporizer, has less frost and condensate water collection and treatment functions, and can be used in an electrical machine room to ensure that the electrical machine room is free of water.

[0046] The non-active gas supply and cooling system in the embodiment stores low-temperature liquefied gas in a vacuum-insulated double-layer insulated low-temperature liquefied gas storage tank 14, realizes pressure maintenance through a self-provided vaporizer 17, and realizes cold preservation through vacuum insulation of the double-layer tank body interlayer. Each valve on the pipeline can be pneumatic or electric, and the power source is from a storage battery. The vaporizer 17 is an air bath type vaporizer, which realizes heat exchange between low-temperature liquefied gas in the vaporizer heat exchange pipe and air, and the low-temperature liquefied gas absorbs heat from the environment to become gas.

[0047] Compared with the non-active emergency cooling system only having an emergency cooling function, the non-active gas supply and cooling system in the embodiment improves the utilization rate of the system, equipment and medium, the low-temperature liquefied gas storage tank device is no longer placed for a long time, and the loss of low-temperature liquefied gas due to heat leakage does not have to be considered, thereby reducing the volume of the low-temperature liquefied gas storage tank device. The non-active gas supply and cooling system realizes coupling of gas supply and cooling, ensures normal gas supply, guarantees emergency cooling in the case of failure of the normal ventilation system of an industrial plant, realizes combined supply of gas and heat, and saves energy.

[0048] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the protection scope of the present application.

Claims

1. A passive gas supply and cooling system, characterized in that, include: Cryogenic liquefied gas storage tank device, outdoor vaporization device, indoor vaporization device, first pipeline, second pipeline, first valve installed on the first pipeline, second valve installed on the second pipeline, third pipeline, and fourth pipeline. The cryogenic liquefied gas storage tank is connected to the outdoor vaporization unit via a first pipeline, and the outdoor vaporization unit is connected to the gas user via a third pipeline. The cryogenic liquefied gas storage tank is connected to the indoor vaporization device through the second pipeline. The indoor vaporization device is located in the room that needs to be cooled. The second valve is located outside the room that needs to be cooled. The indoor vaporization device is connected to the third pipeline through the fourth pipeline. The passive gas supply and cooling system also includes: a fifth pipeline, a fifth valve installed on the fifth pipeline, a first pressure regulating device installed on the third pipeline, an indoor vaporization device connected to the fifth pipeline, an outlet of the fifth pipeline connected to the high altitude, and an outdoor vaporization device connected to the fifth pipeline through a fourth pipeline. The passive gas supply and cooling system also includes: a temperature detection device installed in the room that needs cooling, the temperature detection device being connected to a first valve and a second valve. When the temperature detection device detects that the room that needs cooling exceeds the preset temperature, it interlocks to close the first valve and open the second valve, allowing low-temperature liquefied gas to enter the room that needs cooling. After passing through an indoor vaporization device, the gas undergoes convection and radiation heat exchange with the air, vaporizes into gas, and is then supplied to the gas user after being regulated by a first pressure regulating device.

2. The passive gas supply and cooling system according to claim 1, characterized in that, The fifth valve is closer to the outlet of the fifth pipeline than the connection between the fourth and fifth pipelines, and the first pressure regulating device is closer to the gas user than the connection between the fourth and third pipelines.

3. The passive gas supply and cooling system according to claim 1, characterized in that, Also includes: An alarm device is connected to a temperature detection device. When the temperature detection device detects that the room requiring cooling exceeds the preset temperature, the alarm device will be triggered.

4. The passive gas supply and cooling system according to claim 1, characterized in that, The cryogenic liquefied gas storage tank device includes: a cryogenic liquefied gas storage tank, a sixth pipeline, a second pressure regulating device installed on the sixth pipeline, a vaporizer installed on the sixth pipeline, a seventh pipeline, a third pressure regulating device installed on the seventh pipeline, and an eighth pipeline. One end of the seventh pipeline is connected to the liquid in the cryogenic liquefied gas storage tank, and the other end of the seventh pipeline is connected to one end of the eighth pipeline. The other end of the eighth pipeline is connected to the gas in the cryogenic liquefied gas storage tank. One end of the sixth pipeline is connected to the liquid in the cryogenic liquefied gas storage tank, and the other end of the sixth pipeline is connected to the eighth pipeline. On the sixth pipeline, the second pressure regulating device is closer to the liquid end of the cryogenic liquefied gas storage tank than the vaporizer. The connection point between the sixth pipeline and the eighth pipeline is closer to the gas end of the cryogenic liquefied gas storage tank than the connection point between the seventh pipeline and the eighth pipeline.

5. The passive gas supply and cooling system according to claim 4, characterized in that, The cryogenic liquefied gas storage tank is a vacuum-insulated double-layered tank with a vacuum interlayer.

6. The passive gas supply and cooling system according to any one of claims 1 to 5, characterized in that, The outdoor vaporization device is an outdoor air-bath vaporizer, and the indoor vaporization device is an indoor air-bath vaporizer.

7. The passive gas supply and cooling system according to any one of claims 1 to 5, characterized in that, The cryogenic liquefied gas storage tank device stores any one of liquid nitrogen, liquid carbon dioxide, or liquid helium.

8. The passive gas supply and cooling system according to any one of claims 1 to 5, characterized in that, There are two sets of cryogenic liquefied gas storage tank units, one of which is the cryogenic liquefied gas storage tank unit in use, and the other is a standby cryogenic liquefied gas storage tank unit.

9. The passive gas supply and cooling system according to claim 8, characterized in that, Also includes: The ninth pipe and the ninth valve are installed on the ninth pipe. One end of the ninth pipe is connected to the first pipe, and the other end of the ninth pipe is connected to the second pipe. The cryogenic liquefied gas storage tank in use is connected to the outdoor vaporization device through the first pipe. The cryogenic liquefied gas storage tank in use is connected to the second pipe through the ninth pipe. The second valve is closer to the indoor vaporization device than the connection between the ninth pipe and the second pipe. The standby cryogenic liquefied gas storage tank is connected to the indoor vaporization device through the second pipe. The standby cryogenic liquefied gas storage tank is connected to the first pipe through the ninth pipe. The first valve is closer to the outdoor vaporization device than the connection between the ninth pipe and the first pipe.

Images