Fully supercooled liquid methane filling system

Abstract

The utility model provides a full supercooled liquid methane filling system. The full supercooled liquid methane filling system comprises a refrigerant filling module, a supercooled liquid methane module and a liquid methane filling module. Wherein the refrigerant filling module is connected with a liquid methane supercooling storage tank of the supercooling liquid methane module through a filling pipeline and is used for supercooling liquid methane in the liquid methane storage tank. And the supercooled liquid methane module is connected with the liquid methane filling module through a pipeline and is used for filling cooled liquid methane into the rocket storage tank. The liquid methane supercooling storage tank comprises a liquid methane storage tank and a heat preservation layer located outside the liquid methane storage tank, and a refrigerant interlayer is arranged between the liquid methane storage tank and the heat preservation layer and used for containing the refrigerant provided by the refrigerant filling module and cooling liquid methane in the liquid methane storage tank. According to the filling system, the liquid methane supercooling efficiency can be improved, liquid methane crystallization is avoided, the supercooling process is stable and efficient, and the economic benefit of the supercooling filling process is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to low temperature liquid rocket filling technical field especially relates to liquid methane filling, concretely is a kind of full supercooling liquid methane filling system. BACKGROUND

[0002] With the rapid development of aerospace industry, the technology involved in rocket field has also achieved rapid development. Especially with the development of low-temperature launch vehicle technology, liquid oxygen and liquid methane, a new type of propellant combination, have attracted widespread attention and are increasingly used in practice. Currently, the supercooling technology for liquid methane is generally heat exchange in a supercooler, i.e. liquid methane is supercooled and filled on the same day, which requires high control for filling and has the risk of crystallization due to excessively low temperature of liquid methane, which easily blocks the supercooler and seriously affects the launch mission.

[0003] In the case of using a supercooler to supercool liquid methane, when an emergency occurs or filling needs to be stopped after completion, to prevent crystallization, liquid methane cannot be immediately stopped flowing, and liquid nitrogen needs to be discharged to a safe liquid level before liquid methane flow can be stopped, causing waste. With the development of low-temperature new rocket aerospace technology, there is an urgent need for a liquid methane supercooling filling system that can meet the requirements of high frequency, full supercooling, large supercooling capacity, safety, stability and economy. SUMMARY

[0004] The utility model aims at overcoming the shortcomings of the prior art and providing a full supercooling liquid methane filling system to solve the problems of low supercooling efficiency, easy crystallization, unstable supercooling process and easy resource waste in the prior art.

[0005] The utility model provides a kind of full supercooling liquid methane filling system, and the filling system includes: coolant filling module, supercooling liquid methane module and liquid methane filling module, wherein the coolant filling module is connected with the liquid methane supercooling tank of the supercooling liquid methane module by filling pipeline, for the liquid methane in the liquid methane tank is supercooled and cooled down;The supercooling liquid methane module pipeline is connected with the liquid methane filling module, for the liquid methane after filling and cooling down of rocket tank;The liquid methane supercooling tank includes liquid methane tank and the heat preservation layer located in the liquid methane tank exterior, the liquid methane tank and the heat preservation layer have coolant interlayer, for accommodating the coolant provided by the coolant filling module, for the liquid methane in the liquid methane tank is cooled down.

[0006] Further, the refrigerant filling module comprises a refrigerant storage tank connected to the liquid methane subcooling storage tank through a refrigerant filling pipeline to provide refrigerant for the liquid methane; the refrigerant filling pipeline is connected to a refrigerant tank car for providing refrigerant through a refrigerant transfer pipeline; the refrigerant storage tank is communicated between the top and the bottom through a self-pressurization pipeline to adjust the pressure of the refrigerant storage tank through refrigerant gasification, thereby adjusting the refrigerant temperature; the top of the refrigerant storage tank is communicated to the top of the refrigerant interlayer through a refrigerant pressurization pipeline to pressurize the refrigerant interlayer; and the top of the refrigerant storage tank is provided with a refrigerant storage tank exhaust pipe to adjust the pressure of the refrigerant storage tank.

[0007] Further, the self-pressurization pipeline is sequentially provided with a self-pressurization stop valve, a self-pressurization regulating valve and a self-pressurization vaporizer.

[0008] Further, the refrigerant storage tank exhaust pipe is communicated to the gas phase space of the top of the refrigerant storage tank through two parallel pipelines upstream, and is merged into one pipeline and communicated to the atmosphere downstream; one of the parallel pipelines upstream of the refrigerant storage tank exhaust pipe is provided with a safety relief valve, and the other pipeline is provided with a refrigerant storage tank exhaust valve.

[0009] In the embodiment of the utility model, the supercooled liquid methane module comprises the liquid methane subcooling storage tank, the liquid methane storage tank in the liquid methane subcooling storage tank has lower liquid inlet pipe and upper liquid outlet pipe; the lower liquid inlet pipe is communicated with the liquid methane tank car through the liquid methane transfer pipeline to provide liquid methane; the upper liquid outlet pipe is communicated with the lower liquid inlet pipe through the supercooled liquid methane filling pipeline, the supercooled liquid methane filling pipeline is communicated with the liquid methane storage tank through the lower liquid inlet pipe upstream, and is communicated with the rocket storage tank downstream; the upper part of the liquid methane storage tank is communicated with the high-pressure helium bottle group through the helium gas supplementing pipeline to provide high-pressure gas pressure for the liquid methane storage tank.

[0010] Further, the liquid methane storage tank is provided with a liquid methane lower cavity temperature detector and a liquid methane upper cavity temperature detector for measuring the liquid methane temperature of the lower part and the upper part in the cavity of the liquid methane storage tank respectively; the supercooled liquid methane filling pipeline between the lower liquid inlet pipe and the upper liquid outlet pipe is provided with a low-temperature circulating pump to circulate and mix the liquid methane of the upper part and the lower part in the liquid methane storage tank, thereby keeping the temperature of the liquid methane in the liquid methane storage tank uniform.

[0011] Further, the upper part of the heat preservation layer is provided with an interlayer upper cavity liquid level meter, and the lower part of the heat preservation layer is provided with an interlayer lower cavity liquid level meter; both the interlayer upper cavity liquid level meter and the interlayer lower cavity liquid level meter are communicated with the refrigerant interlayer to measure the refrigerant liquid level.

[0012] Further, the liquid methane storage tank top gas phase space is connected with a methane cavity manometer, and the liquid methane storage tank top is communicated with the atmosphere through a liquid methane storage tank exhaust pipe for pressure relief; the refrigerant interlayer top gas phase space is connected with an interlayer cavity manometer, and the refrigerant interlayer top is communicated with the atmosphere through an interlayer cavity exhaust pipe for pressure relief.

[0013] In the embodiment of the utility model, the liquid methane filling module includes the supercooled liquid methane filling pipeline connecting the supercooled liquid methane module and the rocket tank, and the supercooled liquid methane filling pipeline is provided with a supercooled liquid methane filling cut-off valve, a flow meter for measuring the liquid methane flow and a supercooled liquid methane filling regulating valve for regulating the liquid methane flow.

[0014] Further, the supercooled liquid methane filling pipeline is provided with a liquid methane rocket temperature detector and a supercooled liquid methane filling valve at one end close to the rocket tank.

[0015] According to the above-mentioned embodiment, the full supercooled liquid methane filling system provided by the utility model has at least one of the following benefits:

[0016] 1. The technology provided by the utility model can realize supercooling of liquid methane in a tank with an interlayer and storage of supercooled liquid methane, the refrigerant temperature is controllable and will not be lower than the freezing point of liquid methane, so liquid methane crystallization will not occur, and the risk of ice blockage affecting rocket launch due to supercooling by a supercooler on the day of filling is avoided.

[0017] 2. The supercooling system of the application can produce a large amount of supercooled liquid methane, the supercooling flow is not limited by the heat exchange capacity of a heat exchanger, and larger flow liquid methane filling can be provided, and the supercooling filling capacity for large-capacity and large-flow low-temperature liquid rockets is provided.

[0018] 3. In addition, the supercooling system of the application does not need online supercooling on the day of filling, can realize large-flow filling, is not limited by the capacity of a heat exchanger, and greatly compresses the filling time.

[0019] 4. The method provided by the utility model fills the refrigerant first and then fills the liquid methane, fills the refrigerant first, the refrigerant can reduce the temperature of the interlayer and the inner cylinder of the liquid methane tank, plays a precooling role, and the refrigerant used has an economical price and lower cost.

[0020] 5. The filling method provided by the utility model can stop the flow of supercooled liquid methane at any time, does not need to worry about ice blockage of a supercooler, and has a faster response speed to emergency situations.

[0021] 6、Liquid argon triple point temperature 83.81K is lower than liquid methane triple point temperature 90.66K, 6.85K. Liquid nitrogen 63.15K is lower than liquid methane triple point temperature 90.66K, 27.51K. The temperature difference between the refrigerant of the application and the liquid methane triple point temperature is small, so the risk of liquid methane crystallization is smaller, and the temperature of the refrigerant of the application is more easily controlled above the liquid methane crystallization temperature by increasing the pressure to control the temperature. At the same time, liquid argon is purchased from the market, which is a common and low-cost refrigerant.

[0022] 7、The helium used for pressure compensation and pressure increase in the inner cylinder of the liquid methane storage tank has very low solubility in liquid methane and will not contaminate liquid methane, and helium is an inert gas and is safer. Since helium is very expensive, in order to reduce costs, the application also provides a helium recovery device, which re-compresses helium to a high-pressure helium cylinder by using a pressure increasing pump, realizes the reuse of helium, and greatly reduces the launch cost.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the scope of the application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The following drawings are part of the specification of the application and illustrate example embodiments of the application. The accompanying drawings and description are used to illustrate the principles of the application.

[0025] Figure 1 A structure diagram of a full supercooled liquid methane filling system provided by the application.

[0026] Explanation of reference signs:

[0027] 1-refrigerant storage tank, 2-self-pressurizing stop valve, 3-self-pressurizing regulating valve, 4-self-pressurizing vaporizer, 5-first refrigerant temperature sensor, 6-refrigerant filling cut-off valve, 7-refrigerant pipeline filter, 8-refrigerant filling regulating valve, 9-second refrigerant temperature sensor, 10-refrigerant tank car, 11-refrigerant transfer cut-off valve;

[0028] 12-liquid methane tank car, 13-liquid methane transfer cut-off valve, 14-low-temperature circulating pump, 15-supercooled liquid methane filling cut-off valve, 16-flow meter, 17-supercooled liquid methane filling regulating valve, 18-liquid methane inlet temperature sensor, 19-supercooled liquid methane filling valve, 20-rocket storage tank;

[0029] 21-liquid methane lower cavity temperature sensor, 22-liquid methane upper cavity temperature sensor, 23-high-pressure pressure increasing pump, 24-high-pressure helium cylinder group, 25-high-pressure helium pressure reducing valve, 26-methane cavity pressure gauge;

[0030] 27-gas discharge regulating valve, 28-argon air temperature device, 29-interlayer cavity exhaust pipe, 30-interlayer cavity pressure gauge, 31-interlayer cavity pressure regulating valve, 32-interlayer upper cavity liquid level gauge, 33-interlayer lower cavity liquid level gauge, 34-pressure supplement cut-off valve, 35-safety release valve, 36-refrigerant storage tank exhaust pipe, 37-refrigerant storage tank pressure gauge, 38-third refrigerant temperature sensor;

[0031] 39-liquid methane storage tank, 40-thermal insulation layer;

[0032] 41-refrigerant transfer line, 42-refrigerant filling line, 43-liquid methane transfer line, 44-subcooled liquid methane filling line, 45-refrigerant pressure increasing line;

[0033] 46-pressure regulating valve, 47-liquid methane circulation cut-off valve, 48-refrigerant storage tank exhaust valve, 49-liquid methane storage tank exhaust valve;

[0034] 50-self-pressure increasing line, 51-liquid methane storage tank exhaust pipe, 52-lower liquid inlet pipe, 53-upper liquid outlet pipe, 54-refrigerant interlayer. DETAILED DESCRIPTION

[0035] The detailed description of the present application is not to be considered as limiting the application to the specific described embodiments, but rather to be understood as a description of certain aspects, features and embodiments of the application.

[0036] Many modifications and variations of the present application described in the specification are possible without departing from the scope or spirit of the application. Other implementations of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only.

[0037] The present application provides a kind of full subcooled liquid methane filling system, as shown in Figure 1 In specific embodiments, the filling system includes: a refrigerant filling module, a subcooled liquid methane module and a liquid methane filling module. The refrigerant filling module is connected to the liquid methane subcooled storage tank of the subcooled liquid methane module through the filling line, and is used to subcool the liquid methane in the liquid methane storage tank.

[0038] The subcooled liquid methane module is connected to the liquid methane filling module through the line, and is used to fill the rocket tank 20 with the subcooled liquid methane.

[0039] Further, the liquid methane subcooling tank comprises a liquid methane tank 39 and a heat preservation layer 40 outside the liquid methane tank 39. The cold agent interlayer 54 is arranged between the liquid methane tank 39 and the heat preservation layer 40, and is used for containing the cold agent provided by the cold agent filling module, and cooling the liquid methane in the liquid methane tank 39.

[0040] In the specific embodiment of the utility model, the cold agent filling module comprises a cold agent tank 1, and the cold agent tank 1 is connected to the liquid methane subcooling tank through a cold agent filling pipeline 42 to provide the cold agent for the liquid methane.

[0041] The cold agent filling pipeline 42 is connected to the cold agent tank car 10 for providing the cold agent through a cold agent transfer filling pipeline 41, and a cold agent transfer filling cut-off valve 11 is arranged on the cold agent transfer filling pipeline 41 and is used for controlling the opening and closing of the cold agent transfer filling. In addition, the cold agent filling pipeline 42 between the cold agent transfer filling pipeline 41 and the cold agent tank 1 is sequentially provided with a cold agent pipeline filter 7 for filtering the cold agent, a cold agent filling cut-off valve 6 for controlling the cold agent filling and transfer filling, and a first cold agent temperature detector 5 for measuring the temperature of the cold agent.

[0042] The cold agent filling pipeline 42 between the cold agent transfer filling pipeline 41 and the liquid methane subcooling tank is sequentially provided with a cold agent filling regulating valve 8 for controlling the cold agent filling and a second cold agent temperature detector 9 for measuring the temperature of the cold agent.

[0043] The cold agent tank 1 is communicated between the top and the bottom through a self-pressurizing pipeline 50, is used for adjusting the pressure of the cold agent tank 1 through the gasification of the cold agent, and then adjusting the temperature of the cold agent and increasing the pressure for the discharge of the cold agent, and is more favorable for providing the cold agent for the subcooling liquid methane module. The upstream of the self-pressurizing pipeline 50 is connected to the bottom of the cold agent tank 1, the downstream is connected to the top of the cold agent tank 1, and the upstream part of the self-pressurizing pipeline 50 is sequentially provided with a self-pressurizing cut-off valve 2, a self-pressurizing regulating valve 3 and a self-pressurizing vaporizer 4, and is used for realizing the gasification of the cold agent, and then supplementing the cold agent into the upper gas phase space of the cold agent tank 1 through the pipeline, improving the internal air pressure of the cold agent tank 1, and then changing the temperature of the cold agent. In addition, by increasing the air pressure in the cold agent tank 1, it is also favorable for the cold agent to be transported to the subcooling liquid methane module, and then realizing the subcooling effect.

[0044] In addition, the top of the cold agent tank 1 is communicated to the top of the cold agent interlayer 54 through a cold agent pressurizing pipeline 45, and is used for pressurizing the cold agent interlayer 54. The upstream of the cold agent pressurizing pipeline 45 is connected to the cold agent tank 1, the downstream is connected to the top gas phase space of the cold agent interlayer 54, and the cold agent pressurizing pipeline 45 is sequentially provided with a pressure supplement cut-off valve 34 and a interlayer cavity pressure supplement regulating valve 31 from the upstream to the downstream. In addition, the top gas phase space of the cold agent interlayer 54 is connected with an interlayer cavity pressure gauge 30, which is used for detecting the pressure of the interlayer cavity in real time, and then dynamically adjusting the pressure of the cold agent interlayer 54 through the control of the interlayer cavity pressure supplement regulating valve 31.

[0045] The refrigerant storage tank 1 is provided with a refrigerant storage tank exhaust pipe 36 at the top thereof for adjusting the pressure of the refrigerant storage tank 1.

[0046] One of the parallel pipes upstream of the refrigerant storage tank exhaust pipe 36 is provided with a safety relief valve 35, and the other pipe is provided with a refrigerant storage tank exhaust valve 48.

[0047] In addition, the refrigerant storage tank 1 is provided with a refrigerant storage tank pressure gauge 37 at the top thereof for detecting the pressure inside the refrigerant storage tank 1 in real time and adjusting the pressure inside the refrigerant storage tank 1 through the safety relief valve 35 and the refrigerant storage tank exhaust valve 48 on the refrigerant storage tank exhaust pipe 36.

[0048] In addition, the refrigerant storage tank 1 is provided with a third refrigerant temperature detector 38 for detecting the temperature of the refrigerant inside the refrigerant storage tank 1 in real time and adjusting the temperature through the self-pressurizing structure.

[0049] In the specific embodiment of the utility model, the supercooled liquid methane module comprises a liquid methane supercooling storage tank, the liquid methane storage tank 39 in the liquid methane supercooling storage tank has a lower liquid inlet pipe 52 at the bottom and an upper liquid outlet pipe 53 at the top.

[0050] The upper liquid outlet pipe 53 and the lower liquid inlet pipe 52 are connected through a supercooled liquid methane filling pipe 44, the supercooled liquid methane filling pipe 44 is connected to the liquid methane storage tank 39 through the lower liquid inlet pipe 52 upstream and connected to the rocket storage tank 20 downstream, for providing supercooled liquid methane for the rocket storage tank 20.

[0051] The upper part of the liquid methane storage tank 39 is connected to a high-pressure helium bottle group 24 through a helium gas supplement pipe, for providing high-pressure gas pressure for the liquid methane storage tank 39, increasing the gas pressure in the liquid methane storage tank 39, and facilitating the filling of supercooled liquid methane into the rocket storage tank 20 through the pipe. The upper part of the liquid methane storage tank 39 is connected to a methane cavity pressure gauge 26, for detecting the pressure inside the liquid methane storage tank 39 in real time. The helium gas supplement pipe connected to the liquid methane storage tank 39 is provided with a high-pressure helium pressure reducing valve 25 and a pressure regulating valve 46, for dynamically adjusting the pressure increase in the liquid methane storage tank 39 according to the pressure value detected by the methane cavity pressure gauge 26.

[0052] In addition, the high-pressure helium tank group 24 and the liquid methane storage tank 39 are also provided with a helium recovery pipeline, and a high-pressure booster pump 23 is arranged on the helium recovery pipeline, which is used to recover the helium in the gas phase space inside the liquid methane storage tank 39 to the high-pressure helium tank group 24 through the helium recovery pipeline. Preferably, the booster gas helium can also be any gas that is not soluble in liquid methane, inert, safe, and economical.

[0053] Further, the liquid methane storage tank 39 is provided with a liquid methane lower cavity temperature measuring device 21 and a liquid methane upper cavity temperature measuring device 22, which are respectively used to measure the liquid methane temperature of the lower part and the upper part in the cavity of the liquid methane storage tank 39.

[0054] In addition, a low-temperature circulating pump 14 is arranged on the supercooled liquid methane filling pipeline 44 between the lower liquid inlet pipe 52 and the upper liquid outlet pipe 53, which is used to circulate and mix the liquid methane in the upper part and the lower part in the liquid methane storage tank 39, so as to keep the temperature of the liquid methane in the liquid methane storage tank 39 uniform. Because there is a certain temperature difference between the upper part and the lower part of the liquid methane in the cavity of the liquid methane storage tank 39 during the preparation of supercooled liquid methane or after long-term storage, in order to make the temperature of the liquid methane inside similar or without temperature difference, it is necessary to mix the liquid methane in the cavity of the liquid methane storage tank 39 sufficiently, so that the overall temperature tends to be consistent.

[0055] In the specific embodiment of the utility model, the top of the liquid methane storage tank 39 is communicated with the atmosphere through a liquid methane storage tank exhaust pipe 51 for pressure relief. The liquid methane storage tank exhaust pipe 51 is provided with a liquid methane storage tank exhaust valve 49, which is used to control the exhaust of the liquid methane storage tank 39 to the atmosphere, facilitating the transfer and filling of liquid methane.

[0056] In addition, the top of the refrigerant interlayer 54 is communicated with the atmosphere through an interlayer cavity exhaust pipe 29 for pressure relief, which is used for the filling and pressure relief of the refrigerant. The interlayer cavity exhaust pipe 29 is provided with a gas discharge regulating valve 27 and an argon air cooler 28.

[0057] In the embodiment of the utility model, there are two kinds of transfer processes of liquid methane. One transfer mode is: opening the liquid methane transfer cut-off valve 13, opening the liquid methane storage tank exhaust valve 49, and then increasing the pressure in the liquid methane tank truck 12 through the liquid methane booster vaporizer, and using the pressure difference to transport the liquid methane in the liquid methane tank truck 12 to the liquid methane storage tank 39 through the lower liquid inlet pipe 52.

[0058] Another transfer mode is: opening the liquid methane transfer cut-off valve 13 and the liquid methane circulation cut-off valve 47, and starting the low-temperature circulating pump 14, and transporting the liquid methane in the liquid methane tank truck 12 to the liquid methane storage tank 39 through the upper liquid outlet pipe 53.

[0059] In the specific embodiment of the utility model, the upper portion of the heat preservation layer 40 is provided with a sandwich upper cavity liquid level meter 32, the lower portion of the heat preservation layer 40 is provided with a sandwich lower cavity liquid level meter 33, the sandwich upper cavity liquid level meter 32 and the sandwich lower cavity liquid level meter 33 are all communicated with the refrigerant sandwich 54 for measuring the refrigerant liquid level. When the refrigerant liquid level is detected to be lower than the sandwich lower cavity liquid level meter 33, the refrigerant storage tank 1 is controlled to add refrigerant into the refrigerant sandwich 54. When the refrigerant liquid level is detected to reach or exceed the sandwich upper cavity liquid level meter 32, the refrigerant storage tank 1 is controlled to stop adding refrigerant into the refrigerant sandwich 54.

[0060] In the specific embodiment of the utility model, the liquid methane filling module comprises a supercooled liquid methane module and a supercooled liquid methane filling pipeline 44 connected with the rocket storage tank 20, the supercooled liquid methane filling pipeline 44 is provided with a supercooled liquid methane filling cut-off valve 15, a flow meter 16 for measuring the liquid methane flow and a supercooled liquid methane filling regulating valve 17 for regulating the liquid methane flow.

[0061] Further, the supercooled liquid methane filling pipeline 44 is provided with a liquid methane rocket temperature detector 18 and a supercooled liquid methane filling valve 19 at one end close to the rocket storage tank 20.

[0062] In the embodiment of the utility model, the liquid methane filling process has two kinds. One filling mode is: opening the supercooled liquid methane filling cut-off valve 15, closing the liquid methane transfer filling cut-off valve 13, opening the supercooled liquid methane filling valve 19, pressurizing the liquid methane storage tank 39 through the high-pressure helium bottle group 24, and using the pressure difference to extrude the supercooled liquid methane into the rocket storage tank 20.

[0063] Another filling mode is: opening the supercooled liquid methane filling cut-off valve 15, closing the liquid methane transfer filling cut-off valve 13, opening the supercooled liquid methane filling valve 19, and then starting the low-temperature circulating pump 14 to pump the supercooled liquid methane into the rocket storage tank 20.

[0064] In the specific embodiment of the utility model, the refrigerant is liquid argon. The liquid argon can be changed into liquid nitrogen or other inert low-temperature medium with a boiling point temperature lower than the boiling point temperature of liquid methane and higher than the freezing point temperature of liquid methane as the refrigerant, but the refrigerant storage temperature needs to be adjusted synchronously. If the liquid argon is replaced by liquid nitrogen, the refrigerant storage tank pressure and the tank sandwich pressure need to be increased by about 2.5 times compared with the liquid argon.

[0065] The specific liquid methane supercooling and filling steps of the full supercooled liquid methane filling system provided by the utility model are as follows:

[0066] First, refrigerant transfer filling: connecting the refrigerant tank truck 10 with the refrigerant transfer filling pipeline 41, increasing the tank truck pressure through the self-pressurizing vaporizer of the refrigerant tank truck 10, opening the refrigerant transfer filling cut-off valve 11, closing the refrigerant filling regulating valve 8, opening the refrigerant filling cut-off valve 6, opening the refrigerant tank exhaust valve 48, and transferring filling the refrigerant into the refrigerant storage tank 1 through the pressure difference.

[0067] Second, the coolant temperature control: because the liquid argon triple point temperature 83.81K lower than the liquid methane triple point temperature 90.66K, 6.85K. So need to liquid argon temperature, the method for increasing the temperature of the liquid argon tank pressure, pressure rise corresponding to the saturation temperature rise. Open self-pressurizing stop valve 2, control the opening of the self-pressurizing regulating valve 3, liquid argon from the coolant tank 1 into the self-pressurizing argon vaporizer 4, the volume increases about 780 times. After the gasification of argon back to the upper gas phase space of the coolant tank 1, the limited space gas volume increases, the pressure inside the coolant tank 1 rises. Self-pressurizing regulating valve 3 interlocking coolant tank pressure gauge 37 control opening, the tank pressure of the coolant tank 1 is maintained at about 0.15MPa (absolute pressure), the temperature of the liquid argon will gradually increase until the corresponding 0.15MPa saturation temperature about 91K after reaching a dynamic equilibrium state, complete the coolant temperature control.

[0068] Third, the coolant filling: close the coolant transfer cut-off valve 11, open the coolant filling cut-off valve 6, the liquid argon is introduced into the liquid methane subcooling tank coolant interlayer 54. When the pressure of the coolant interlayer 54 is greater than 0.15MPa (absolute pressure), the gas discharge regulating valve 27 interlocks with the interlayer cavity pressure gauge 30, and the pressure is released. When the pressure is lower than 0.1MPa (absolute pressure), the opening of the gas discharge regulating valve 27 is adjusted or closed to maintain the pressure of the coolant interlayer 54 at 0.15MPa (absolute pressure).

[0069] When the liquid argon level in the coolant interlayer 54 is lower than the liquid level point of the lower interlayer cavity liquid level gauge 33, the opening of the coolant filling regulating valve 8 is increased. When the liquid argon level is higher than the liquid level point of the upper interlayer cavity liquid level gauge 32, the opening of the coolant filling regulating valve 8 is adjusted or closed, and the coolant filling is completed.

[0070] When the pressure of the coolant interlayer 54 is lower than 0.15MPa (absolute pressure), the pressure of the coolant interlayer 54 can be adjusted by adjusting the interlayer cavity pressure regulating valve 31 interlocked with the interlayer cavity pressure gauge 30, thereby maintaining the pressure in the interlayer and the saturation temperature of the liquid argon in the coolant interlayer 54.

[0071] Fourth, liquid methane transfer: connect the liquid methane tank truck 12 with the liquid methane third transfer pipeline 43, close the subcooling liquid methane filling cut-off valve 15, open the liquid methane transfer cut-off valve 13, and increase the pressure in the liquid methane tank truck 12 through the liquid methane pressure vaporizer. Then open the liquid methane tank exhaust valve 49, and transfer the liquid methane into the liquid methane tank 39 through the pressure difference. Alternatively, the liquid methane can also be transferred into the liquid methane tank 39 by opening the liquid methane circulating cut-off valve 47 and using the low-temperature circulating pump 14.

[0072] Fifth, liquid methane subcooling: liquid methane and liquid argon heat exchange through the metal wall of liquid methane storage tank 39, because the temperature of the coolant is controlled above the freezing point of liquid methane, so the two media can heat exchange for a long time, liquid argon absorbs the heat energy of liquid methane, and then the temperature of liquid methane decreases, thereby causing the volume of liquid methane to decrease and the density to increase, and the gas phase space of liquid methane storage tank 39 increases, in order to avoid negative pressure in the liquid methane storage tank 39, the pressure of the liquid methane storage tank 39 measured by the methane cavity pressure gauge 26 is connected to open the pressure regulating valve 46, and the inner cylinder of the liquid methane storage tank 39 is pressurized to atmospheric pressure. Because the solubility of helium and liquid methane is extremely low, the quality of the liquid methane propellant can be ensured. After the temperature of the liquid methane decreases, the temperature is slightly higher than or equal to the temperature of the coolant liquid argon 91K, and the process of subcooling the liquid methane is completed.

[0073] Sixth, subcooled liquid methane self-circulation: during the preparation of subcooled liquid methane or long-term storage, the temperature of the liquid methane in the liquid methane storage tank 39 is not uniform, when the temperature data of the liquid methane measured by the lower cavity temperature detector 21 and the upper cavity temperature detector 22 of the liquid methane are greatly different, it indicates that the temperature of the subcooled liquid methane in the liquid methane storage tank is not uniform. Then open the liquid methane circulation cut-off valve 47, and automatically start the low-temperature circulating pump 14 to mix the subcooled liquid methane with uneven temperature sufficiently, until the temperature deviation is reduced or consistent, and the low-temperature circulating pump 14 is automatically stopped.

[0074] Seventh, subcooled liquid methane filling: close the liquid methane transfer cut-off valve 13, open the subcooled liquid methane filling cut-off valve 15, open the subcooled liquid methane filling valve 19, pressurize the liquid methane storage tank 39 through the high-pressure helium bottle group 24, and use the pressure difference to extrude the subcooled liquid methane into the rocket tank 20. Or open the subcooled liquid methane filling cut-off valve 15, close the liquid methane transfer cut-off valve 13, open the subcooled liquid methane filling valve 19, and then start the low-temperature circulating pump 14 to pump the subcooled liquid methane into the rocket tank 20. The subcooled liquid methane filling regulating valve 17 is connected to the flowmeter 16, which controls the filling flow to meet the technical requirements of the rocket launch, and the liquid methane rocket temperature detector 18 monitors the temperature of the subcooled liquid methane in real time to determine whether it meets the temperature requirements of the rocket launch, and stops the filling if it does not meet the requirements.

[0075] Eighth, helium recovery: after the filling task is completed, the helium in the liquid methane storage tank 39 can be recovered to the high-pressure helium bottle group 24 by opening the high-pressure booster pump 23, completing the helium recovery, and reducing the filling cost.

[0076] The above merely illustrates the specific implementation of the present application, and any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principles of the present application shall fall within the scope of protection of the present application.

Claims

1. A full subcooling liquid methane refueling system, characterized in that, The filling system comprises a coolant filling module, a supercooled liquid methane module and a liquid methane filling module, wherein, The coolant filling module is connected with the liquid methane supercooling tank of the supercooled liquid methane module through a filling pipeline, and is used for supercooling the liquid methane in the liquid methane supercooling tank; The supercooled liquid methane module is connected with the liquid methane filling module through a pipeline, and is used for filling the rocket tank (20) with the cooled liquid methane; The coolant filling module comprises a coolant tank (1), and the coolant tank (1) is connected with the liquid methane supercooling tank through a coolant filling pipeline (42) to provide coolant for the liquid methane.

2. The full subcooling liquid methane refueling system of claim 1, wherein, The coolant filling pipeline (42) is connected with a coolant tank truck (10) for providing coolant through a coolant transfer pipeline (41); The coolant tank (1) is connected with the bottom through a self-pressurizing pipeline (50) to adjust the pressure of the coolant tank (1) by gasification of the coolant, so as to adjust the temperature of the coolant; The top of the coolant tank (1) is connected with the top of the liquid methane supercooling tank through a coolant pressurizing pipeline (45) to pressurize the liquid methane supercooling tank; The top of the coolant tank (1) is provided with a coolant tank exhaust pipeline (36) to adjust the pressure of the coolant tank (1).

3. The full subcool liquid methane refueling system of claim 2, wherein, The self-pressurizing pipeline (50) is sequentially provided with a self-pressurizing stop valve (2), a self-pressurizing regulating valve (3) and a self-pressurizing vaporizer (4).

4. The full subcool liquid methane refueling system of claim 2, wherein, The upstream of the coolant tank exhaust pipeline (36) is connected with the gas phase space of the top of the coolant tank (1) through two parallel pipelines, and the downstream of the coolant tank exhaust pipeline (36) is combined into one pipeline and connected with the atmosphere; One of the parallel pipelines on the upstream of the coolant tank exhaust pipeline (36) is provided with a safety relief valve (35), and the other pipeline is provided with a coolant tank exhaust valve (48).

5. The full subcool liquid methane refueling system of claim 1, wherein, The supercooled liquid methane module comprises the liquid methane supercooling tank, and the liquid methane supercooling tank comprises a liquid methane tank (39) and a heat preservation layer (40) outside the liquid methane tank (39), and a coolant interlayer (54) is arranged between the liquid methane tank (39) and the heat preservation layer (40) to accommodate the coolant provided by the coolant filling module to cool the liquid methane in the liquid methane tank (39); The bottom of the liquid methane tank (39) in the liquid methane supercooling tank is provided with a lower liquid inlet pipeline (52), and the upper part is provided with an upper liquid outlet pipeline (53); The lower liquid inlet pipeline (52) is connected with a liquid methane tank truck (12) through a liquid methane transfer pipeline (43) to provide liquid methane; The upper liquid outlet pipeline (53) and the lower liquid inlet pipeline (52) are connected through a supercooled liquid methane filling pipeline (44), the upstream of the supercooled liquid methane filling pipeline (44) is connected with the liquid methane tank (39) through the lower liquid inlet pipeline (52), and the downstream is connected with the rocket tank (20); The upper part of the liquid methane tank (39) is connected with a high-pressure helium bottle group (24) through a helium gas supplement pipeline to provide high-pressure gas pressure for the liquid methane tank (39).

6. The full subcool liquid methane fuelling system of claim 5, wherein, The liquid methane tank (39) is provided with a liquid methane lower chamber temperature measuring device (21) and a liquid methane upper chamber temperature measuring device (22) for measuring the temperature of the liquid methane in the lower and upper chambers of the liquid methane tank (39) respectively. The subcooled liquid methane filling pipeline (44) between the liquid inlet pipe (52) and the liquid outlet pipe (53) is provided with a low-temperature circulating pump (14) for circulating and mixing the liquid methane in the upper and lower chambers of the liquid methane tank (39) to keep the temperature of the liquid methane in the liquid methane tank (39) uniform.

7. The full subcool liquid methane fuelling system of claim 5, wherein, The upper part of the heat preservation layer (40) is provided with a sandwich upper chamber liquid level meter (32), and the lower part of the heat preservation layer (40) is provided with a sandwich lower chamber liquid level meter (33), both of which communicate with the refrigerant sandwich layer (54) for measuring the refrigerant liquid level.

8. The full subcool liquid methane refueling system of claim 5, wherein, The top gas space of the liquid methane tank (39) is connected with a methane chamber pressure gauge (26), and the top of the liquid methane tank (39) is connected with the atmosphere through a liquid methane tank exhaust pipe (51) for pressure relief. The top gas space of the refrigerant sandwich layer (54) is connected with a sandwich chamber pressure gauge (30), and the top of the refrigerant sandwich layer (54) is connected with the atmosphere through a sandwich chamber exhaust pipe (29) for pressure relief.

9. The full subcool liquid methane refueling system of claim 5, wherein, The liquid methane filling module includes the subcooled liquid methane filling pipeline (44) connecting the subcooled liquid methane module and the rocket tank (20), and the subcooled liquid methane filling pipeline (44) is provided with a subcooled liquid methane filling cut-off valve (15), a flow meter (16) for measuring the liquid methane flow, and a subcooled liquid methane filling regulating valve (17) for regulating the liquid methane flow.

10. The full subcool liquid methane fuelling system of claim 9, wherein, The end of the subcooled liquid methane filling pipeline (44) close to the rocket tank (20) is provided with a liquid methane into rocket temperature measuring device (18) and a subcooled liquid methane filling valve (19).

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