Methane full-supercooling filling system in liquid oxygen methane rocket filling system

Abstract

The utility model provides a methane full-supercooling filling system in a liquid oxygen methane rocket filling system. The methane full-supercooling filling system comprises a liquid nitrogen container, the first heat exchanger is connected with a first liquid phase outlet of the liquid nitrogen container; an outlet of the first heat exchanger is connected with a gas phase inlet of the liquid nitrogen container; the first heat exchange device is connected with a second liquid phase outlet of the liquid nitrogen container; a methane storage tank A; the second heat exchanger is connected with a first liquid phase outlet of the methane storage tank A; an outlet of the second heat exchanger is connected with a gas phase inlet of the methane storage tank A; the first heat exchange device is connected with a second liquid phase inlet / outlet of the methane storage tank A; the methane storage tank B is connected with the first heat exchange device; and the methane adding and storing device is connected with the methane storage tank B. In a liquid oxygen methane rocket filling system, the filling system is adopted, large-flow full supercooling of methane can be effectively achieved in a backflow cooling mode, and the construction cost of the methane filling system is reduced in the backflow cooling mode.

Description

Technical Field

[0001] The utility model belongs to the field of low-temperature methane filling of carrier rockets, relates to a methane full supercooling filling system in a liquid oxygen-methane rocket filling system and a methane full supercooling filling method, and in particular to a methane full supercooling filling system in a liquid oxygen-methane rocket filling system. Background Art

[0002] Methane propellant and liquid oxygen propellant are the main propellants of rockets. Supercooling of methane and liquid oxygen can improve the overall performance of rockets. However, when the liquid oxygen and methane filling flow rate reaches 5m 3 / min~10m 3 / min. Based on the full subcooling requirement, a larger subcooler is required, which leads to high construction and renovation costs.

[0003] Therefore, how to find a more suitable refueling system to cryogenically refuel the launch vehicle in a more economical and efficient manner has become one of the focuses of widespread attention among many front-line researchers in the industry. Utility Model Content

[0004] In view of this, the technical problem to be solved by the utility model is to provide a methane full supercooling filling system in a liquid oxygen-methane rocket filling system. The methane full supercooling filling system provided by the utility model is a new method for supercooling low-temperature propellants, which uses a smaller supercooler, adjusts the temperature through a small flow reflux, and then starts large flow filling. Moreover, the equipment used is simple, operable and stable, and is more suitable for promotion and application in industrial production.

[0005] The utility model provides a methane full supercooling filling system in a liquid oxygen and methane rocket filling system, comprising:

[0006] Liquid nitrogen container;

[0007] a first heat exchanger connected to a first liquid phase outlet of the liquid nitrogen container;

[0008] The outlet of the first heat exchanger is connected to the gas phase inlet of the liquid nitrogen container;

[0009] a first heat exchange device connected to the second liquid phase outlet of the liquid nitrogen container;

[0010] Methane storage tank A;

[0011] a second heat exchanger connected to the first liquid phase outlet of the methane storage tank A;

[0012] The outlet of the second heat exchanger is connected to the gas phase inlet of the methane storage tank A;

[0013] A first heat exchange device connected to the second liquid phase inlet and outlet of the methane storage tank A;

[0014] A methane storage tank B connected to the first heat exchange device;

[0015] A methane storage device connected to the methane storage tank B.

[0016] Preferably, a regulating valve JL2 is provided between the first liquid phase outlet of the liquid nitrogen container and the first heat exchanger;

[0017] The second liquid phase outlet of the liquid nitrogen container is connected to the cold medium inlet of the first heat exchange device;

[0018] A stop valve JF4 and a stop valve JF6 are provided between the second liquid phase outlet of the liquid nitrogen container and the cold medium inlet of the first heat exchange device;

[0019] The cold medium outlet of the first heat exchange device is provided with a stop valve JF13;

[0020] A regulating valve JL1 is provided between the first liquid phase outlet of the methane storage tank A and the second heat exchanger.

[0021] Preferably, the heat medium inlet of the first heat exchange device is connected to the second liquid phase inlet and outlet of the methane storage tank A;

[0022] A stop valve JF1 and a stop valve JF9 are provided between the heat medium inlet of the first heat exchange device and the second liquid phase inlet and outlet of the methane storage tank A;

[0023] The heat medium outlet of the first heat exchange device is connected to the second liquid phase inlet and outlet of the methane storage tank B;

[0024] A stop valve JF7 is provided between the heat medium outlet of the first heat exchange device and the second liquid phase inlet and outlet of the methane storage tank B.

[0025] Preferably, the second liquid phase inlet and outlet of the methane storage tank B is connected to the inlet of the methane storage device;

[0026] A stop valve JF10, a stop valve JF11 and a stop valve JF15 are provided between the second liquid phase inlet and outlet of the methane storage tank B and the inlet of the methane storage device;

[0027] The second liquid phase inlet and outlet of the methane storage tank A are switched by opening and closing the stop valve;

[0028] The second liquid phase inlet and outlet of the methane storage tank B are switched by opening and closing the stop valve.

[0029] Preferably, the methane fully subcooled filling system further includes a third heat exchanger;

[0030] The first liquid phase outlet of the methane storage tank B is connected to the inlet of the third heat exchanger;

[0031] The outlet of the third heat exchanger is connected to the gas phase inlet of the methane storage tank B;

[0032] A regulating valve JL3 is provided between the first liquid phase outlet of the methane storage tank B and the inlet of the third heat exchanger.

[0033] Preferably, the methane fully subcooled filling system further comprises a second heat exchange device;

[0034] The second liquid phase outlet of the liquid nitrogen container is connected to the cold medium inlet of the second heat exchange device;

[0035] A stop valve JF4 and a stop valve JF5 are provided between the second liquid phase outlet of the liquid nitrogen container and the cold medium inlet of the second heat exchange device;

[0036] The cold medium outlet of the second heat exchange device is provided with a stop valve JF14.

[0037] Preferably, the second liquid phase inlet and outlet of the methane storage tank B is connected to the heat medium inlet of the second heat exchange device;

[0038] A stop valve JF8 and a stop valve JF3 are provided between the second liquid phase inlet and outlet of the methane storage tank B and the heat medium inlet of the second heat exchange device;

[0039] The second liquid phase inlet and outlet of the methane storage tank A is connected to the heat medium outlet of the second heat exchange device;

[0040] A stop valve JF2 is provided between the second liquid phase inlet and outlet of the methane storage tank A and the heat medium outlet of the second heat exchange device.

[0041] Preferably, the second liquid phase inlet and outlet of the methane storage tank A is connected to the inlet of the methane storage device;

[0042] A stop valve JF12, a stop valve JF13 and a stop valve JF15 are provided between the second liquid phase inlet and outlet of the methane storage tank A and the inlet of the methane storage device;

[0043] The methane storage tank A and the methane storage tank B are connected to each other through a stop valve.

[0044] The utility model also provides a methane full subcooling filling method for a liquid oxygen-methane rocket filling system, comprising the following steps:

[0045] 1) After respectively pressurizing the liquid nitrogen storage tank and the methane storage tank A, the liquid nitrogen and methane are sent to a first heat exchange device for heat exchange to obtain supercooled methane, which is then sent to a methane storage tank B;

[0046] 2) Fill the supercooled methane in methane tank B into the methane tank of the liquid oxygen-methane rocket filling system to achieve full supercooled filling of methane.

[0047] Preferably, the first heat exchange device comprises a plate-fin heat exchanger;

[0048] The pressurization method includes realizing the gas phase of the storage tank itself pressurizing the liquid phase by heat exchange;

[0049] Specifically, the heat exchange comprises firstly sending liquid nitrogen into the first heat exchange device to reach a specified liquid level, and then passing methane into the first heat exchange device for heat exchange;

[0050] The cooling capacity of the first heat exchange device is 1 to 2 m 3 / min;

[0051] The total subcooling amount of the subcooled methane is 5 to 10 m 3 / min.

[0052] The utility model provides a methane full supercooling filling system in a liquid oxygen-methane rocket filling system. Compared with the prior art, in a liquid oxygen-methane rocket filling system, the filling system and the large-flow methane full supercooling method provided by the utility model can effectively achieve large-flow full supercooling of methane through reflux cooling, and the construction cost of the methane filling system can be reduced through reflux cooling.

[0053] The large flow methane full supercooling method provided by the utility model is a new low temperature propellant supercooling method, which adopts a smaller supercooler, adjusts the temperature through a small flow reflux, and then starts a large flow filling, adopts a cooling capacity of 1m 3 / min~2m 3 / min subcooler, the subcooled methane is added to the storage tank through the booster pump, so that the total subcooling capacity can reach 5m 3 / min~10m 3 / min, achieving large-flow, fully subcooled methane filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 The present invention provides a simplified schematic diagram of the system structure of a methane full subcooling filling system.

[0055] Among them, 1 is a liquid nitrogen container, 2 is a low-temperature container A, 3 is a low-temperature container B, 4 is a heat exchanger, 5 is a heat exchanger, 6 is a heat exchanger, 7 is a subcooler B, 8 is a subcooler A, 9 is a pump B, 10 is a pump A, JF1~JF15 are all stop valves, and JL1~JL3 are all regulating valves. DETAILED DESCRIPTION

[0056] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention rather than limiting the patent requirements of the present invention.

[0057] All raw materials of the present invention have no particular restrictions on their sources, and can be purchased from the market or prepared according to conventional methods well known to those skilled in the art.

[0058] There is no particular restriction on the purity of all raw materials in the present invention. The present invention preferably uses industrial purity or conventional purity in the field of liquid oxygen and methane rocket filling.

[0059] All the raw materials of the utility model, their brands and abbreviations are conventional brands and abbreviations in the field, and each brand and abbreviation is clear and definite in the field of its related use. Those skilled in the art can purchase them from the market or prepare them by conventional methods according to the brands, abbreviations and corresponding uses.

[0060] The utility model provides a methane full supercooling filling system in a liquid oxygen and methane rocket filling system, comprising:

[0061] Liquid nitrogen container;

[0062] a first heat exchanger connected to a first liquid phase outlet of the liquid nitrogen container;

[0063] The outlet of the first heat exchanger is connected to the gas phase inlet of the liquid nitrogen container;

[0064] a first heat exchange device connected to the second liquid phase outlet of the liquid nitrogen container;

[0065] Methane storage tank A;

[0066] a second heat exchanger connected to the first liquid phase outlet of the methane storage tank A;

[0067] The outlet of the second heat exchanger is connected to the gas phase inlet of the methane storage tank A;

[0068] A first heat exchange device connected to the second liquid phase inlet and outlet of the methane storage tank A;

[0069] A methane storage tank B connected to the first heat exchange device;

[0070] A methane storage device connected to the methane storage tank B.

[0071] In the present utility model, a regulating valve JL2 is preferably provided between the first liquid phase outlet of the liquid nitrogen container and the first heat exchanger.

[0072] In the present invention, the second liquid phase outlet of the liquid nitrogen container is preferably connected to the cold medium inlet of the first heat exchange device.

[0073] In the present invention, a stop valve JF4 and a stop valve JF6 are preferably provided between the second liquid phase outlet of the liquid nitrogen container and the cold medium inlet of the first heat exchange device.

[0074] In the present utility model, the cold medium outlet of the first heat exchange device is preferably provided with a stop valve JF13.

[0075] In the present utility model, a regulating valve JL1 is preferably provided between the first liquid phase outlet of the methane storage tank A and the second heat exchanger.

[0076] In the present invention, the heat medium inlet of the first heat exchange device is preferably connected to the second liquid phase inlet and outlet of the methane storage tank A.

[0077] In the present invention, a stop valve JF1 and a stop valve JF9 are preferably provided between the heat medium inlet of the first heat exchange device and the second liquid phase inlet and outlet of the methane storage tank A.

[0078] In the present invention, the heat medium outlet of the first heat exchange device is preferably connected to the second liquid phase inlet and outlet of the methane storage tank B.

[0079] In the present utility model, a stop valve JF7 is preferably provided between the heat medium outlet of the first heat exchange device and the second liquid phase inlet and outlet of the methane storage tank B.

[0080] In the present invention, the second liquid phase inlet and outlet of the methane storage tank B is preferably connected to the inlet of the methane storage device.

[0081] In the present utility model, a stop valve JF10, a stop valve JF11 and a stop valve JF15 are preferably provided between the second liquid phase inlet and outlet of the methane storage tank B and the inlet of the methane storage device.

[0082] In the present invention, the second liquid phase inlet and outlet of the methane storage tank A are preferably switched by opening and closing a stop valve.

[0083] In the present invention, the second liquid phase inlet and outlet of the methane storage tank B are preferably switched by opening and closing a stop valve.

[0084] In the present invention, the methane full subcooling filling system preferably further includes a third heat exchanger.

[0085] In the present utility model, the first liquid phase outlet of the methane storage tank B is preferably connected to the inlet of the third heat exchanger.

[0086] In the present invention, the outlet of the third heat exchanger is preferably connected to the gas phase inlet of the methane storage tank B.

[0087] In the present utility model, a regulating valve JL3 is preferably provided between the first liquid phase outlet of the methane storage tank B and the inlet of the third heat exchanger.

[0088] In the present invention, the methane fully subcooled filling system preferably further includes a second heat exchange device.

[0089] In the present invention, the second liquid phase outlet of the liquid nitrogen container is preferably connected to the cold medium inlet of the second heat exchange device.

[0090] In the present invention, a stop valve JF4 and a stop valve JF5 are preferably provided between the second liquid phase outlet of the liquid nitrogen container and the cold medium inlet of the second heat exchange device.

[0091] In the present invention, the cold medium outlet of the second heat exchange device is preferably provided with a stop valve JF14.

[0092] In the present utility model, the second liquid phase inlet and outlet of the methane storage tank B is preferably connected to the heat medium inlet of the second heat exchange device.

[0093] In the present utility model, a stop valve JF8 and a stop valve JF3 are preferably provided between the second liquid phase inlet and outlet of the methane storage tank B and the heat medium inlet of the second heat exchange device.

[0094] In the present invention, the second liquid phase inlet and outlet of the methane storage tank A is preferably connected to the heat medium outlet of the second heat exchange device.

[0095] In the present utility model, a stop valve JF2 is preferably provided between the second liquid phase inlet and outlet of the methane storage tank A and the heat medium outlet of the second heat exchange device.

[0096] In the present invention, the second liquid phase inlet and outlet of the methane storage tank A is preferably connected to the inlet of the methane storage device.

[0097] In the present utility model, a stop valve JF12, a stop valve JF13 and a stop valve JF15 are preferably provided between the second liquid phase inlet and outlet of the methane storage tank A and the inlet of the methane storage device.

[0098] In the present invention, the methane storage tank A and the methane storage tank B are preferably connected to each other through a stop valve.

[0099] The utility model provides a methane full subcooling filling method for a liquid oxygen-methane rocket filling system (liquid oxygen-methane rocket filling process), comprising the following steps:

[0100] 1) After respectively pressurizing the liquid nitrogen storage tank and the methane storage tank A, the liquid nitrogen and methane are sent to a first heat exchange device for heat exchange to obtain supercooled methane, which is then sent to a methane storage tank B;

[0101] 2) Fill the supercooled methane in methane tank B into the methane tank of the liquid oxygen-methane rocket filling system to achieve full supercooled filling of methane.

[0102] The utility model firstly pressurizes the liquid nitrogen storage tank and the methane storage tank A respectively, and then sends the liquid nitrogen and methane into a first heat exchange device for heat exchange to obtain supercooled methane, which is then sent into the methane storage tank B.

[0103] In the present invention, the first heat exchange device preferably includes a plate-fin heat exchanger.

[0104] In the present invention, the pressurization method preferably includes pressurizing the gas phase of the storage tank itself with the liquid phase by heat exchange.

[0105] In the present invention, the heat exchange is preferably performed by first feeding liquid nitrogen into the first heat exchange device to reach a specified liquid level, and then introducing methane into the first heat exchange device for heat exchange.

[0106] In the present invention, the cooling capacity of the first heat exchange device is preferably 1 to 2 m 3 / min.

[0107] The utility model finally fills the supercooled methane in the methane storage tank B into the methane storage tank of the liquid oxygen methane rocket filling system, thereby realizing full supercooled filling of methane.

[0108] In the present invention, the total subcooling amount of the subcooled methane is preferably 5 to 10 m 3 / min.

[0109] The utility model is a complete and detailed overall technical solution, which better ensures the efficiency and stability of large-flow full-supercooled methane filling. The methane full-supercooled filling system and the methane large-flow full-supercooled filling method in the above-mentioned liquid oxygen methane rocket filling system may specifically include the following contents:

[0110] See also Figure 1 , Figure 1 This is a schematic diagram of the system structure of the methane full subcooling filling system provided by the utility model. Among them, 1 is a liquid nitrogen container, 2 is a low temperature container A, 3 is a low temperature container B, 4 is a heat exchanger, 5 is a heat exchanger, 6 is a heat exchanger, 7 is a subcooler B, 8 is a subcooler A, 9 is a pump B, 10 is a pump A, JF1~JF15 are all stop valves, and JL1~JL3 are all regulating valves.

[0111] In the utility model, low temperature container A (methane storage tank A) and low temperature container B (methane storage tank B) are methane low temperature tanks. The methane in low temperature container A is cooled by extrusion through supercooler B and then flows back to low temperature container B. The cooling capacity of supercooler is 1-2m 3 / min, the supercooled methane is added to the storage tank through the booster pump, so that the total supercooling capacity can reach 5-10m 3 / min.

[0112] The specific filling process includes the following steps:

[0113] 1) Liquid nitrogen storage tank pressurization: Liquid nitrogen passes through the regulating valve JL2, passes through the heat exchanger, pressurizes the liquid nitrogen storage tank, and then opens the stop valves JF4, JF6, and JF13;

[0114] 2) Filling liquid nitrogen into subcooler B: By adjusting the opening of JL2, the liquid nitrogen filling flow rate is controlled, and liquid nitrogen is added to the shell of the subcooler to reach the specified liquid level;

[0115] 3) Methane storage tank A pressurization: Methane passes through the regulating valve JL1 and the heat exchanger to pressurize the methane tank;

[0116] 4) Methane subcooling: Open the stop valves JF1, JF9, and JF7, and methane enters the plate-fin heat exchanger. The temperature difference between liquid nitrogen and methane is used to cool the methane.

[0117] 5) Methane tank transfer: The supercooled methane is transferred to the methane storage tank B until all the methane in the methane storage tank A is transferred to the B tank;

[0118] 6) Filling the methane tank: Open the stop valves JF10, JF11, and JF15, and fill the methane tank by adjusting the flow of pump B;

[0119] 7) Methane storage tank box A and methane storage tank box B can be interchanged.

[0120] The above content of the utility model provides a methane full supercooling filling system and a methane large flow full supercooling filling method in a liquid oxygen and methane rocket filling system. In the liquid oxygen and methane rocket filling system, the filling system and the large flow methane full supercooling method provided by the utility model can effectively achieve a large flow of methane full supercooling through reflux cooling, and the construction cost of the methane filling system can be reduced through reflux cooling.

[0121] The large flow methane full supercooling method provided by the utility model is a new low temperature propellant supercooling method, which adopts a smaller supercooler, adjusts the temperature through a small flow reflux, and then starts a large flow filling, adopts a cooling capacity of 1m 3 / min~2m 3 / min subcooler, the subcooled methane is added to the storage tank through the booster pump, so that the total subcooling capacity can reach 5m 3 / min~10m 3 / min, achieving large-flow, fully subcooled methane filling.

[0122] In order to further illustrate the present invention, a methane fully subcooled filling system in a liquid oxygen-methane rocket filling system provided by the present invention is described in detail below in combination with the embodiments. However, it should be understood that these embodiments are implemented on the premise of the technical scheme of the present invention, and detailed implementation methods and specific operating processes are given only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention, and the protection scope of the present invention is not limited to the embodiments described below.

[0123] Example 1

[0124] The overall structure of the methane full subcooling filling system in the liquid oxygen methane rocket filling system is as follows Figure 1 shown.

[0125] The specific filling process includes the following steps:

[0126] 1) Open the regulating valve JF2, and the liquid nitrogen passes through the heat exchanger to pressurize the liquid nitrogen storage tank. When the pressure reaches 0.8MPa, open the stop valves JF4, JF6, and JF13;

[0127] 2) By adjusting the opening of JL2, control the liquid nitrogen filling flow rate to 500L / min, and add liquid nitrogen to the shell of the subcooler to reach the II liquid level;

[0128] 3) The methane in the methane storage tank A passes through the regulating valve JL1 and the heat exchanger to pressurize the methane tank. When the pressure reaches 1.2MPa, the stop valves JF1, JF9, and JF7 are opened, and the methane enters the plate-fin heat exchanger. The temperature difference between liquid nitrogen and methane is used to cool the methane by 90K.

[0129] 4) The supercooled methane is transferred to methane storage tank B until 400m3 of methane is in methane storage tank A. 3 All the methane is transferred to tank B;

[0130] 5) Open stop valves JF10, JF11, and JF15, and adjust the flow rate of pump B to 10m 3 / min, filling the methane tank;

[0131] 6) Methane storage tank box A and methane storage tank box B can be interchanged.

[0132] The above is a detailed introduction to a methane full subcooling filling system and a methane large flow full subcooling filling method in a liquid oxygen methane rocket filling system provided by the utility model. In this article, specific examples are used to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and its core idea of ​​the utility model, including the best mode, and also enables any technician in the field to practice the utility model, including manufacturing and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model. The scope of patent protection of the utility model is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements that are not different from the text of the claims, or if they include equivalent structural elements that are not substantially different from the text of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. A methane fully subcooled filling system in a liquid oxygen and methane rocket filling system, characterized in that: include: Liquid nitrogen container; a first heat exchanger connected to a first liquid phase outlet of the liquid nitrogen container; The outlet of the first heat exchanger is connected to the gas phase inlet of the liquid nitrogen container; a first heat exchange device connected to the second liquid phase outlet of the liquid nitrogen container; Methane storage tank A; a second heat exchanger connected to the first liquid phase outlet of the methane storage tank A; The outlet of the second heat exchanger is connected to the gas phase inlet of the methane storage tank A; A first heat exchange device connected to the second liquid phase inlet and outlet of the methane storage tank A; A methane storage tank B connected to the first heat exchange device; A methane storage device connected to the methane storage tank B.

2. The methane full subcooling filling system according to claim 1 is characterized in that: A regulating valve JL2 is provided between the first liquid phase outlet of the liquid nitrogen container and the first heat exchanger; The second liquid phase outlet of the liquid nitrogen container is connected to the cold medium inlet of the first heat exchange device; A stop valve JF4 and a stop valve JF6 are provided between the second liquid phase outlet of the liquid nitrogen container and the cold medium inlet of the first heat exchange device; The cold medium outlet of the first heat exchange device is provided with a stop valve JF13; A regulating valve JL1 is provided between the first liquid phase outlet of the methane storage tank A and the second heat exchanger.

3. The methane full subcooling filling system according to claim 1, characterized in that: The heat medium inlet of the first heat exchange device is connected to the second liquid phase inlet and outlet of the methane storage tank A; A stop valve JF1 and a stop valve JF9 are provided between the heat medium inlet of the first heat exchange device and the second liquid phase inlet and outlet of the methane storage tank A; The heat medium outlet of the first heat exchange device is connected to the second liquid phase inlet and outlet of the methane storage tank B; A stop valve JF7 is provided between the heat medium outlet of the first heat exchange device and the second liquid phase inlet and outlet of the methane storage tank B.

4. The methane full subcooling filling system according to claim 1, characterized in that: The second liquid phase inlet and outlet of the methane storage tank B is connected to the inlet of the methane storage device; A stop valve JF10, a stop valve JF11 and a stop valve JF15 are provided between the second liquid phase inlet and outlet of the methane storage tank B and the inlet of the methane storage device; The second liquid phase inlet and outlet of the methane storage tank A are switched by opening and closing the stop valve; The second liquid phase inlet and outlet of the methane storage tank B are switched by opening and closing the stop valve.

5. The methane full subcooling filling system according to claim 1, characterized in that: The methane full subcooling filling system also includes a third heat exchanger; The first liquid phase outlet of the methane storage tank B is connected to the inlet of the third heat exchanger; The outlet of the third heat exchanger is connected to the gas phase inlet of the methane storage tank B; A regulating valve JL3 is provided between the first liquid phase outlet of the methane storage tank B and the inlet of the third heat exchanger.

6. The methane full subcooling filling system according to claim 1, characterized in that: The methane fully subcooled filling system also includes a second heat exchange device; The second liquid phase outlet of the liquid nitrogen container is connected to the cold medium inlet of the second heat exchange device; A stop valve JF4 and a stop valve JF5 are provided between the second liquid phase outlet of the liquid nitrogen container and the cold medium inlet of the second heat exchange device; The cold medium outlet of the second heat exchange device is provided with a stop valve JF14.

7. The methane full subcooling filling system according to claim 6, characterized in that: The second liquid phase inlet and outlet of the methane storage tank B is connected to the heat medium inlet of the second heat exchange device; A stop valve JF8 and a stop valve JF3 are provided between the second liquid phase inlet and outlet of the methane storage tank B and the heat medium inlet of the second heat exchange device.

8. The methane full subcooling filling system according to claim 6, characterized in that: The second liquid phase inlet and outlet of the methane storage tank A is connected to the heat medium outlet of the second heat exchange device; A stop valve JF2 is provided between the second liquid phase inlet and outlet of the methane storage tank A and the heat medium outlet of the second heat exchange device.

9. The methane full subcooling filling system according to claim 8, characterized in that: The second liquid phase inlet and outlet of the methane storage tank A is connected to the inlet of the methane storage device; A stop valve JF12, a stop valve JF13 and a stop valve JF15 are provided between the second liquid phase inlet and outlet of the methane storage tank A and the inlet of the methane adding and storing device.

10. The methane full subcooling filling system according to claim 1, characterized in that: The methane storage tank A and the methane storage tank B are connected to each other through a stop valve.

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