Liquid oxygen supercooling and high flow filling system

Abstract

The application relates to a low-temperature propellant filling system, in particular to a liquid oxygen deep supercooling large-flow filling system, which comprises a conventional liquid oxygen storage device, a first-stage liquid oxygen supercooler, a second-stage liquid oxygen supercooler, a supercooled liquid oxygen storage device, a liquid oxygen filling main pipeline, a first-stage liquid oxygen filling branch pipeline, a first-stage liquid oxygen output branch pipeline, a second-stage liquid oxygen filling branch pipeline and a second-stage liquid oxygen output branch pipeline, the first-stage liquid oxygen supercooler is used for cooling liquid oxygen into supercooled liquid oxygen, the second-stage liquid oxygen supercooler is used for cooling supercooled liquid oxygen into deep supercooled liquid oxygen, the connecting points of the first-stage liquid oxygen filling branch pipeline, the first-stage liquid oxygen output branch pipeline, the second-stage liquid oxygen filling branch pipeline and the second-stage liquid oxygen output branch pipeline with the liquid oxygen filling main pipeline are respectively a first connecting point, a second connecting point, a third connecting point and a fourth connecting point, and the four connecting points are sequentially arranged from upstream to downstream along the liquid oxygen filling main pipeline. The application can realize the deep supercooling large-flow filling function of liquid oxygen.

Description

TECHNICAL FIELD

[0001] The application relates to a low-temperature propellant filling system, in particular to a liquid oxygen deep supercooling large-flow filling system. BACKGROUND

[0002] Low-temperature propellants (such as liquid hydrogen, liquid oxygen, methane and the like) have the characteristics of high specific impulse, non-toxic and non-polluting, and relatively low price, and are widely used in spacecraft, and liquid oxygen is a kind of oxidant with a wider application range.

[0003] The quality of liquid oxygen is mainly reflected in purity and temperature. The temperature of liquid oxygen is crucial for the start of a liquid oxygen centrifugal pump of a ground filling system and a liquid oxygen turbine pump on a rocket. Meanwhile, the density of liquid oxygen is closely related to the temperature. When liquid oxygen is supercooled from 90K to 67K, the mass of liquid oxygen per unit volume is increased by 8% to 10%, and in the case of filling propellants with the same mass, the structure weight of a rocket filled with supercooled propellants is 15% to 25% lighter than that of a rocket filled with propellants in the normal state, and the cost of the rocket is reduced by more than 11%. When supercooled liquid oxygen is used in a launch site filling system, two-phase flow in the conveying pipeline can be effectively prevented, and the pre-cooling time of the conveying pipeline and equipment in the filling process is shortened. Meanwhile, supercooled liquid oxygen has obvious effects on improving the launch coefficient of a rocket. However, the supercooling degree of liquid oxygen in the existing supercooled liquid oxygen filling system cannot meet the use requirements in terms of supercooling filling speed and total mass. In order to improve the launch coefficient and working stability of a rocket, there is an urgent need for a deep supercooled liquid oxygen large-flow filling system in domestic low-temperature rockets. SUMMARY

[0004] The technical problem to be solved by the application is to provide a liquid oxygen deep supercooling large-flow filling system capable of realizing deep supercooling liquid oxygen large-flow filling.

[0005] In order to solve the above technical problem, the application provides the following technical scheme:

[0006] The liquid oxygen deep supercooling large flow filling system comprises a conventional liquid oxygen storage device, a first liquid oxygen supercooling device, a second liquid oxygen supercooling device, a supercooled liquid oxygen storage device, a liquid oxygen filling main pipeline, a first liquid oxygen filling branch pipeline, a first liquid oxygen output branch pipeline, a second liquid oxygen filling branch pipeline and a second liquid oxygen output branch pipeline.

[0007] Further, the liquid oxygen pump, the liquid oxygen pump inlet branch and the liquid oxygen pump outlet branch are further included, the inlet end of the liquid oxygen pump is connected to the liquid oxygen filling main pipeline through the liquid oxygen pump inlet branch, the outlet end of the liquid oxygen pump is connected to the liquid oxygen filling main pipeline through the liquid oxygen pump outlet branch, the first oxygen filling switch valve is arranged on the liquid oxygen pump inlet branch, the connection point of the liquid oxygen pump inlet branch and the liquid oxygen filling main pipeline is a fifth connection point, the connection point of the liquid oxygen pump outlet branch and the liquid oxygen filling main pipeline is a sixth connection point, the fifth connection point and the sixth connection point are both located between the conventional liquid oxygen storage device and the first connection point, and the second oxygen filling switch valve is arranged on the liquid oxygen filling main pipeline between the fifth connection point and the sixth connection point.

[0008] Further, the third oxygen filling switch valve, the fourth oxygen filling switch valve and the fifth oxygen filling switch valve are arranged between the first connecting point and the second connecting point, between the third connecting point and the fourth connecting point, and between the sixth connecting point and the first connecting point on the liquid oxygen filling main pipeline.

[0009] Further, the primary liquid oxygen super-cooler and the secondary liquid oxygen super-cooler are both plate-fin heat exchangers, and the primary liquid oxygen super-cooler and the secondary liquid oxygen super-cooler both use liquid nitrogen as the refrigerant medium.

[0010] Further, the liquid nitrogen storage device, the primary liquid nitrogen filling branch pipeline, the primary nitrogen gas output branch pipeline, the secondary liquid nitrogen filling branch pipeline and the secondary nitrogen gas output branch pipeline are further included, the first refrigerant inlet and the first refrigerant outlet are arranged on the primary liquid oxygen super-cooler, the second refrigerant inlet and the second refrigerant outlet are arranged on the secondary liquid oxygen super-cooler, the liquid nitrogen storage device is connected to the first refrigerant inlet through the primary liquid nitrogen filling branch pipeline, the primary nitrogen gas output branch pipeline is connected to the first refrigerant outlet, the liquid nitrogen in the liquid nitrogen storage device enters the primary liquid oxygen super-cooler through the primary liquid nitrogen filling branch pipeline and the first refrigerant inlet, exchanges heat with the liquid oxygen in the primary liquid oxygen super-cooler, and the liquid oxygen is cooled to super-cooled liquid oxygen after heat exchange, the liquid nitrogen is heated to form nitrogen gas, and the nitrogen gas formed after heating is discharged through the first refrigerant outlet and the primary nitrogen gas output branch pipeline, the liquid nitrogen storage device is connected to the second refrigerant inlet through the secondary liquid nitrogen filling branch pipeline, the secondary nitrogen gas output branch pipeline is connected to the second refrigerant outlet, the liquid nitrogen in the liquid nitrogen storage device enters the secondary liquid oxygen super-cooler through the secondary liquid nitrogen filling branch pipeline and the second refrigerant inlet, exchanges heat with the super-cooled liquid oxygen in the secondary liquid oxygen super-cooler, and the super-cooled liquid oxygen is cooled to deep super-cooled liquid oxygen after heat exchange, the liquid nitrogen is heated to form nitrogen gas, and the nitrogen gas formed after heating is discharged through the second refrigerant outlet and the secondary nitrogen gas output branch pipeline.

[0011] Further, the ejector and the high-pressure nitrogen source are further included, the high-pressure nitrogen source is connected to the nozzle of the ejector, the output end of the secondary nitrogen gas output branch pipeline is connected to the induced flow inlet of the ejector, the high-pressure nitrogen in the high-pressure nitrogen source is sprayed out through the nozzle of the ejector as the induced power source, the secondary liquid oxygen super-cooler is vacuumized to the target vacuum degree, the liquid nitrogen in the liquid nitrogen storage device enters the secondary liquid oxygen super-cooler, and the temperature of the liquid nitrogen is reduced to form super-cooled liquid nitrogen by absorbing heat through phase change, the high-pressure nitrogen in the high-pressure nitrogen source and the nitrogen gas in the secondary liquid oxygen super-cooler transmitted through the secondary nitrogen gas output branch pipeline are mixed in the ejector to form low-pressure nitrogen, and the low-pressure nitrogen is discharged through the diffusion pipe of the ejector.

[0012] Further, the second compression pump, the high-pressure nitrogen buffer device, the first nitrogen circulation branch pipe, the second nitrogen circulation branch pipe and the third nitrogen circulation branch pipe are further included, the high-pressure nitrogen source comprises a plurality of gas cylinders arranged in parallel, the diffuser pipe of the ejector is connected to the high-pressure nitrogen buffer device through the first nitrogen circulation branch pipe, the second compression pump is connected to the first nitrogen circulation branch pipe, the high-pressure nitrogen buffer device is connected to the inlet end of the gas cylinder through the second nitrogen circulation branch pipe, the outlet end of the gas cylinder is connected to the nozzle of the ejector through the third nitrogen circulation branch pipe, the first nitrogen circulation branch pipe, the second nitrogen circulation branch pipe and the third nitrogen circulation branch pipe are respectively provided with the first high-pressure nitrogen on-off valve, the second high-pressure nitrogen on-off valve and the third high-pressure nitrogen on-off valve, and the gas cylinder is provided with the pressure regulating valve.

[0013] Further, the nitrogen exhaust tower is further included, the first-stage nitrogen output branch pipe and the diffuser pipe of the ejector are connected to the nitrogen exhaust tower, and the connecting pipes between the first-stage nitrogen output branch pipe, the diffuser pipe of the ejector and the nitrogen exhaust tower are respectively provided with the on-off valves.

[0014] Further, the first-stage liquid nitrogen filling branch pipe and the second-stage liquid nitrogen filling branch pipe are respectively provided with the temperature sensor, the pressure sensor and the flow meter, the first-stage liquid nitrogen filling branch pipe is provided with the on-off valve and the flow regulating valve, and the second-stage liquid nitrogen filling branch pipe is provided with the on-off valve and the flow regulating valve.

[0015] Further, the temperature sensor, the pressure sensor and the flow meter are arranged on the liquid oxygen filling main pipeline between the fourth connecting point and the supercooled liquid oxygen storage device and between the conventional liquid oxygen storage device and the fifth connecting point.

[0016] Compared with the prior art, the liquid oxygen deep supercooling large-flow filling system has at least the following beneficial effects:

[0017] The liquid oxygen deep supercooling large-flow filling system comprises a first-stage liquid oxygen supercooler and a second-stage liquid oxygen supercooler, the connecting points of the first-stage liquid oxygen supercooler and the liquid oxygen filling main pipeline are a first connecting point and a second connecting point, the connecting points of the second-stage liquid oxygen supercooler and the liquid oxygen filling main pipeline are a third connecting point and a fourth connecting point, and the first connecting point, the second connecting point, the third connecting point and the fourth connecting point are sequentially arranged from upstream to downstream along the liquid oxygen filling main pipeline, so that the first-stage liquid oxygen supercooler and the second-stage liquid oxygen supercooler form a series mode, the liquid oxygen in the conventional liquid oxygen storage device can be continuously supercooled by two stages, the efficiency of liquid oxygen supercooling is improved, the ability of directly preparing 66K deep supercooled liquid oxygen is achieved, the liquid oxygen can be deeply supercooled under the condition of large flow, and the deeply supercooled liquid oxygen can be filled into the aircraft in large flow.

[0018] The liquid oxygen deep supercooling and large flow filling system is further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The liquid oxygen deep supercooling and large flow filling system is further described below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] As Figure 1The application is a liquid oxygen deep supercooling large flow filling system, which comprises a conventional liquid oxygen storage device 01, a first-stage liquid oxygen supercooler 02, a second-stage liquid oxygen supercooler 03, a supercooled liquid oxygen storage device 04, a liquid oxygen filling main pipeline 05, a first-stage liquid oxygen filling branch pipeline 21, a first-stage liquid oxygen output branch pipeline 22, a second-stage liquid oxygen filling branch pipeline 31, and a second-stage liquid oxygen output branch pipeline 32. The liquid oxygen filling main pipeline 05 is connected between the conventional liquid oxygen storage device 01 and the supercooled liquid oxygen storage device 04. The first-stage liquid oxygen supercooler 02 is used for cooling the liquid oxygen in the conventional liquid oxygen storage device 01 to supercooled liquid oxygen. The second-stage liquid oxygen supercooler 03 is used for cooling the supercooled liquid oxygen to deep supercooled liquid oxygen. The first-stage liquid oxygen filling branch pipeline 21, the first-stage liquid oxygen output branch pipeline 22, the second-stage liquid oxygen filling branch pipeline 31, and the second-stage liquid oxygen output branch pipeline 32 are respectively provided with a first-stage filling on-off valve 23, a first-stage output on-off valve 24, a second-stage filling on-off valve 33, and a second-stage output on-off valve 34. The first-stage liquid oxygen filling branch pipeline 21 is connected between the liquid oxygen filling main pipeline 05 and the liquid oxygen inlet of the first-stage liquid oxygen supercooler 02. The first-stage liquid oxygen output branch pipeline 22 is connected between the liquid oxygen outlet of the first-stage liquid oxygen supercooler 02 and the liquid oxygen filling main pipeline 05. The second-stage liquid oxygen filling branch pipeline 31 is connected between the liquid oxygen filling main pipeline 05 and the liquid oxygen inlet of the second-stage liquid oxygen supercooler 03. The second-stage liquid oxygen output branch pipeline 32 is connected between the liquid oxygen outlet of the second-stage liquid oxygen supercooler 03 and the liquid oxygen filling main pipeline 05. The first-stage liquid oxygen supercooler 02 and the second-stage liquid oxygen supercooler 03 are connected in series. The connection points of the first-stage liquid oxygen filling branch pipeline 21, the first-stage liquid oxygen output branch pipeline 22, the second-stage liquid oxygen filling branch pipeline 31, and the second-stage liquid oxygen output branch pipeline 32 and the liquid oxygen filling main pipeline 05 are respectively a first connection point, a second connection point, a third connection point, and a fourth connection point. The first connection point, the second connection point, the third connection point, and the fourth connection point are sequentially arranged along the liquid oxygen filling main pipeline 05 from upstream to downstream. The liquid oxygen in the conventional liquid oxygen storage device 01 enters the first-stage liquid oxygen supercooler 02 through the first-stage liquid oxygen filling branch pipeline 21, is supercooled to supercooled liquid oxygen in the first-stage liquid oxygen supercooler 02, and is output to the liquid oxygen filling main pipeline 05 through the first-stage liquid oxygen output branch pipeline 22. The supercooled liquid oxygen enters the second-stage liquid oxygen supercooler 03 through the second-stage liquid oxygen filling branch pipeline 31, is supercooled to deep supercooled liquid oxygen in the second-stage liquid oxygen supercooler 03, and is input to the supercooled liquid oxygen storage device 04. The temperature of the deep supercooled liquid oxygen is about 66K. The liquid oxygen in the supercooled liquid oxygen storage device 04 is used as propellant to fill the spacecraft.The liquid oxygen deep supercooling large-flow filling system comprises a first-stage liquid oxygen supercooler 02, a second-stage liquid oxygen supercooler 03, a first connecting point and a second connecting point between the first-stage liquid oxygen supercooler 02 and a liquid oxygen filling main pipeline 05, a third connecting point and a fourth connecting point between the second-stage liquid oxygen supercooler 03 and the liquid oxygen filling main pipeline 05, and the first connecting point, the second connecting point, the third connecting point and the fourth connecting point are sequentially arranged from upstream to downstream along the liquid oxygen filling main pipeline 05, so that the first-stage liquid oxygen supercooler 02 and the second-stage liquid oxygen supercooler 03 form a series mode, liquid oxygen in a conventional liquid oxygen storage device 01 can be continuously supercooled in two stages, the efficiency of liquid oxygen supercooling is improved, the capacity of directly preparing 66K deep supercooled liquid oxygen is provided, liquid oxygen can be deeply supercooled under the condition of large flow, and deeply supercooled liquid oxygen can be filled into a spacecraft in large flow. The liquid oxygen deep supercooling large-flow filling system can also be used in low-temperature filling systems such as liquid methane and liquid hydrogen.

[0021] Optionally, the liquid oxygen deep supercooling large-flow filling system further comprises a liquid oxygen pump 11, a liquid oxygen pump inlet branch pipe 111 and a liquid oxygen pump outlet branch pipe 112, the inlet end of the liquid oxygen pump 11 is connected to the liquid oxygen filling main pipeline 05 through the liquid oxygen pump inlet branch pipe 111, the outlet end of the liquid oxygen pump 11 is connected to the liquid oxygen filling main pipeline 05 through the liquid oxygen pump outlet branch pipe 112, the first oxygen filling switch valve 113 is arranged on the liquid oxygen pump inlet branch pipe 111, the connecting point between the liquid oxygen pump inlet branch pipe 111 and the liquid oxygen filling main pipeline 05 is a fifth connecting point, the connecting point between the liquid oxygen pump outlet branch pipe 112 and the liquid oxygen filling main pipeline 05 is a sixth connecting point, the fifth connecting point and the sixth connecting point are located between the conventional liquid oxygen storage device 01 and the first connecting point, and the second oxygen filling switch valve 114 is arranged on the liquid oxygen filling main pipeline 05 between the fifth connecting point and the sixth connecting point, so that the liquid oxygen pump 11 is connected in parallel to the liquid oxygen filling main pipeline 05, and pump filling or extrusion filling can be used when filling liquid oxygen, the second oxygen filling switch valve 114 is closed and the first oxygen filling switch valve 113 is opened when pump filling is used, and the first oxygen filling switch valve 113 is closed and the second oxygen filling switch valve 114 is opened when extrusion filling is used. Two alternative methods can be used when filling liquid oxygen, and the reliability of the filling system is improved. The second-stage liquid oxygen supercooler 03 and the supercooled liquid oxygen storage device 04 are connected to an external gas source, and when the vacuum degree in the container is lower than the design value, the external gas source is used to supplement gas to maintain the pressure and prevent negative pressure deformation and suction from causing a vacuum.

[0022] Optionally, the third oxygen filling switch valve 115, the fourth oxygen filling switch valve 116 and the fifth oxygen filling switch valve 117 are arranged between the first connecting point and the second connecting point, between the third connecting point and the fourth connecting point, and between the sixth connecting point and the first connecting point on the liquid oxygen filling main pipeline 05 respectively. The fifth oxygen filling switch valve 117 is a flow regulating valve. The liquid oxygen filling speed can be adjusted through the fifth oxygen filling switch valve 117. The third oxygen filling switch valve 115 is arranged in parallel between the liquid oxygen filling main pipeline 05 and the primary liquid oxygen subcooler 02. The fourth oxygen filling switch valve 116 is arranged in parallel between the liquid oxygen filling main pipeline 05 and the secondary liquid oxygen subcooler 03. When the third oxygen filling switch valve 115 and the fourth oxygen filling switch valve 116 are closed, the liquid oxygen is cooled by the two-stage subcooler and then enters the subcooled liquid oxygen storage device 04. When the third oxygen filling switch valve 115 and the fourth oxygen filling switch valve 116 are opened, the liquid oxygen can directly enter the subcooled liquid oxygen storage device 04. When the third oxygen filling switch valve 115 is closed and the fourth oxygen filling switch valve 116 is opened, the liquid oxygen is cooled by the primary liquid oxygen subcooler 02 and then partially enters the subcooled liquid oxygen storage device 04, and the other part is cooled by the secondary liquid oxygen subcooler 03 and then enters the subcooled liquid oxygen storage device 04. The mixing ratio of the subcooled liquid oxygen (80K) and the deeply subcooled liquid oxygen (66K) can be adjusted. The liquid oxygen temperature adjusting and filling can be realized without changing the parameters of the primary liquid oxygen subcooler 02 and the secondary liquid oxygen subcooler 03. The liquid oxygen deeply subcooled large-flow filling system can realize the liquid oxygen temperature adjustment in a large range of 90K-66K, and has a wider application range.

[0023] Optionally, the primary liquid oxygen subcooler 02 and the secondary liquid oxygen subcooler 03 are both plate-fin heat exchangers. The primary liquid oxygen subcooler 02 and the secondary liquid oxygen subcooler 03 use liquid nitrogen as the refrigerant medium. The shell of the primary liquid oxygen subcooler 02 and the secondary liquid oxygen subcooler 03 is used to store the refrigerant medium liquid nitrogen. The heat exchange pipe in the shell of the primary liquid oxygen subcooler 02 and the secondary liquid oxygen subcooler 03 stores the liquid oxygen.

[0024] Optionally, the liquid oxygen deep supercooling large flow filling system further comprises a liquid nitrogen storage device 06, a first-stage liquid nitrogen filling branch pipe 25, a first-stage nitrogen gas output branch pipe 26, a second-stage liquid nitrogen filling branch pipe 35, a second-stage nitrogen gas output branch pipe 36, the first-stage liquid oxygen supercooler 02 is provided with a first refrigerant inlet and a first refrigerant outlet, the second-stage liquid oxygen supercooler 03 is provided with a second refrigerant inlet and a second refrigerant outlet, the liquid nitrogen storage device 06 is connected to the first refrigerant inlet through the first-stage liquid nitrogen filling branch pipe 25, the first-stage nitrogen gas output branch pipe 26 is connected to the first refrigerant outlet, the liquid nitrogen in the liquid nitrogen storage device 06 enters the first-stage liquid oxygen supercooler 02 as a refrigerant medium through the first-stage liquid nitrogen filling branch pipe 25 and the first refrigerant inlet, exchanges heat with the liquid oxygen in the first-stage liquid oxygen supercooler 02, and the liquid oxygen is supercooled to about 80K in the first-stage liquid oxygen supercooler 02 by using conventional liquid nitrogen (77K), the liquid nitrogen is warmed to form nitrogen gas, the nitrogen gas formed after warming is discharged through the first refrigerant outlet and the first-stage nitrogen gas output branch pipe 26, the liquid nitrogen storage device 06 is connected to the second refrigerant inlet through the second-stage liquid nitrogen filling branch pipe 35, the second-stage nitrogen gas output branch pipe 36 is connected to the second refrigerant outlet, the liquid nitrogen in the liquid nitrogen storage device 06 enters the second-stage liquid oxygen supercooler 03 as a refrigerant medium through the second-stage liquid nitrogen filling branch pipe 35 and the second refrigerant inlet, the supercooled liquid nitrogen (64K) exchanges heat with the supercooled liquid oxygen in the second-stage liquid oxygen supercooler 03, the supercooled liquid oxygen is cooled to about 66K after heat exchange, the liquid nitrogen is warmed to form nitrogen gas, and the nitrogen gas formed after warming is discharged through the second refrigerant outlet and the second-stage nitrogen gas output branch pipe 36.

[0025] Optionally, the liquid oxygen deep supercooling large flow filling system further comprises an ejector 07 and a high-pressure nitrogen source 08, the high-pressure nitrogen source 08 is connected to the nozzle of the ejector 07, the output end of the secondary nitrogen output branch pipe 36 is connected to the induced flow inlet of the ejector 07, the high-pressure nitrogen in the high-pressure nitrogen source 08 is sprayed out through the nozzle of the ejector 07 as an induced power source, the secondary liquid oxygen supercooler 03 is vacuumized to the target vacuum degree, the high-pressure nitrogen in the high-pressure nitrogen source 08 and the nitrogen in the secondary liquid oxygen supercooler 03 transmitted through the secondary nitrogen output branch pipe 36 are mixed in the ejector 07 to form low-pressure nitrogen, and the low-pressure nitrogen is discharged through the diffuser pipe of the ejector 07. The output end of the secondary nitrogen output branch pipe 36 of the secondary liquid oxygen supercooler 03 is connected to the ejector 07, the secondary liquid oxygen supercooler 03 uses the ejector mode to vacuumize the heat-exchanged nitrogen in the shell of the secondary liquid oxygen supercooler 03, so that the vacuum degree in the shell of the secondary liquid oxygen supercooler 03 can quickly reach 0.012 MPa, the pressure in the shell of the secondary liquid oxygen supercooler 03 is controlled near the triple point, the liquid nitrogen in the shell is induced by the ejector 07, the vacuum degree in the shell reaches 0.012 MPa (absolute pressure), the liquid nitrogen entering the shell of the secondary liquid oxygen supercooler 03 absorbs its own heat through phase change to reduce its own temperature from 77 K to 64 K, and the supercooled liquid nitrogen at 64 K in the secondary liquid oxygen supercooler 03 exchanges heat with the supercooled liquid oxygen to obtain deep supercooled liquid oxygen. On the basis of the existing equipment, the deep supercooled liquid oxygen large flow filling flow can be stably realized, the ejector 07 uses the high-pressure nitrogen source as the induced power source, the mixing of the power source and the low-temperature nitrogen in the secondary liquid oxygen supercooler 03 is avoided to produce phase change, the use of the temperature restorer is saved, and the entire system has the characteristics of stability, continuity, economy and the like.

[0026] Optionally, the liquid oxygen deep supercooling large flow filling system further comprises a second compression pump 81, a high-pressure nitrogen buffer device 82, a first nitrogen circulation branch pipe 84, a second nitrogen circulation branch pipe 85, and a third nitrogen circulation branch pipe 86, the high-pressure nitrogen source 08 comprises a plurality of gas cylinders 83 connected in parallel, the gas cylinders 83 are high-pressure gas cylinders, the diffuser pipe of the ejector 07 is connected to the high-pressure nitrogen buffer device 82 through the first nitrogen circulation branch pipe 84, the second compression pump 81 is connected to the first nitrogen circulation branch pipe 84, the high-pressure nitrogen buffer device 82 is connected to the inlet ends of the gas cylinders 83 through the second nitrogen circulation branch pipe 85, the outlet ends of the gas cylinders 83 are connected to the nozzle of the ejector 07 through the third nitrogen circulation branch pipe 86, the first nitrogen circulation branch pipe 84, the second nitrogen circulation branch pipe 85, and the third nitrogen circulation branch pipe 86 are respectively provided with a first high-pressure nitrogen on-off valve 87, a second high-pressure nitrogen on-off valve 88, and a third high-pressure nitrogen on-off valve 89, and the gas cylinders 83 are respectively provided with pressure regulating valves. The pressure in the gas cylinders 83 is adjusted through the pressure regulating valves to adjust the inlet pressure of the ejector 07, so that the high-pressure nitrogen source 08 can work in a large pressure range of 0.012 MPa to 0.15 MPa, the normal-temperature mixed nitrogen formed in the diffuser pipe of the ejector 07 is re-compressed by the second compression pump 81 and then filled into the high-pressure nitrogen buffer device 82 and then into the gas cylinders 83, so that the nitrogen is reused, energy is saved, and environmental pollution is reduced.

[0027] Optionally, the liquid oxygen deep supercooling large flow filling system further comprises a nitrogen discharge tower 09, the first-stage nitrogen output branch pipe 26 and the diffuser pipe of the ejector 07 are both connected to the nitrogen discharge tower 09, and the connecting pipes between the first-stage nitrogen output branch pipe 26, the diffuser pipe of the ejector 07, and the nitrogen discharge tower 09 are respectively provided with on-off valves 261 and 71, and the nitrogen is discharged through the nitrogen discharge tower 09 when the nitrogen does not need to be reused.

[0028] Optionally, the first-stage liquid nitrogen filling branch pipe 25 and the second-stage liquid nitrogen filling branch pipe 35 are respectively provided with temperature sensors, pressure sensors, and flow meters, the first-stage liquid nitrogen filling branch pipe 25 is provided with an on-off valve 251 and a flow regulating valve 252, the second-stage liquid nitrogen filling branch pipe 35 is provided with an on-off valve 351 and a flow regulating valve 352, the filling speed of the liquid nitrogen is monitored by the flow meters, the filling speed of the liquid nitrogen is controlled by the tank pressure and the opening degree of the regulating valves, and the liquid nitrogen is automatically supplemented to ensure that the liquid level is not lower than a target liquid level.

[0029] Optionally, the liquid oxygen filling main pipeline 05 is respectively provided with temperature sensors, pressure sensors, and flow meters between the fourth connecting point and the supercooling liquid oxygen storage device 04 and between the conventional liquid oxygen storage device 01 and the fifth connecting point, so that the filling flow, temperature, and pressure of the liquid oxygen and the liquid nitrogen are controlled in real time, and the first-stage liquid oxygen supercooling device 02, the second-stage liquid oxygen supercooling device 03, and the ejector 07 are ensured to be in a designed state.

[0030] The above-described embodiments are merely intended to describe the preferred embodiments of the present application, and are not intended to limit the scope of the present application. Various modifications and improvements to the present application made by those skilled in the art are intended to fall within the scope of the present application defined in the claims.

Claims

1. A liquid oxygen deep subcooling high flowfill system characterized by, The application relates to a liquid oxygen storage device, which comprises a conventional liquid oxygen storage device (01), a first-stage liquid oxygen subcooler (02), a second-stage liquid oxygen subcooler (03), a subcooled liquid oxygen storage device (04), a liquid oxygen filling main pipeline (05), a first-stage liquid oxygen filling branch pipeline (21), a first-stage liquid oxygen output branch pipeline (22), a second-stage liquid oxygen filling branch pipeline (31), a second-stage liquid oxygen output branch pipeline (32), the liquid oxygen filling main pipeline (05) is connected between the conventional liquid oxygen storage device (01) and the subcooled liquid oxygen storage device (04), the first-stage liquid oxygen subcooler (02) is used for cooling liquid oxygen in the conventional liquid oxygen storage device (01) into subcooled liquid oxygen, the second-stage liquid oxygen subcooler (03) is used for cooling the subcooled liquid oxygen into deep subcooled liquid oxygen, the first-stage liquid oxygen filling branch pipeline (21), the first-stage liquid oxygen output branch pipeline (22), the second-stage liquid oxygen filling branch pipeline (31) and the second-stage liquid oxygen output branch pipeline (32) are respectively provided with a first-stage filling on-off valve (23), a first-stage output on-off valve (24), a second-stage filling on-off valve (33) and a second-stage output on-off valve (34), the first-stage liquid oxygen filling branch pipeline (21) is connected between the liquid oxygen filling main pipeline (05) and a liquid oxygen inlet of the first-stage liquid oxygen subcooler (02), the first-stage liquid oxygen output branch pipeline (22) is connected between a liquid oxygen outlet of the first-stage liquid oxygen subcooler (02) and the liquid oxygen filling main pipeline (05), the second-stage liquid oxygen filling branch pipeline (31) is connected between the liquid oxygen filling main pipeline (05) and a liquid oxygen inlet of the second-stage liquid oxygen subcooler (03), the second-stage liquid oxygen output branch pipeline (32) is connected between a liquid oxygen outlet of the second-stage liquid oxygen subcooler (03) and the liquid oxygen filling main pipeline (05), the connection points of the first-stage liquid oxygen filling branch pipeline (21), the first-stage liquid oxygen output branch pipeline (22), the second-stage liquid oxygen filling branch pipeline (31) and the second-stage liquid oxygen output branch pipeline (32) with the liquid oxygen filling main pipeline (05) are respectively a first connection point, a second connection point, a third connection point and a fourth connection point, the first connection point, the second connection point, the third connection point and the fourth connection point are sequentially arranged along the liquid oxygen filling main pipeline (05) from an upstream to a downstream, the first-stage liquid oxygen subcooler (02) and the second-stage liquid oxygen subcooler (03) both take liquid nitrogen as a cooling medium, the application further relates to a liquid nitrogen storage device (06), a first-stage liquid nitrogen filling branch pipeline (25) and a first-stage nitrogen gas output branch pipeline (26) connected with the first-stage liquid oxygen subcooler (02), a second-stage liquid nitrogen filling branch pipeline (35) and a second-stage nitrogen gas output branch pipeline (36) connected with the second-stage liquid oxygen subcooler (03), an ejector (07), a high-pressure nitrogen gas source (08), a second compression pump (81), a high-pressure nitrogen gas buffer device (82), a first nitrogen gas circulating branch pipeline (84), a second nitrogen gas circulating branch pipeline (85) and a third nitrogen gas circulating branch pipeline (86), the high-pressure nitrogen gas source (08) is connected with a nozzle of the ejector (07).The output end of the secondary nitrogen output branch pipe (36) is connected with the entrained flow inlet of the ejector (07), high-pressure nitrogen in the high-pressure nitrogen source (08) is sprayed out through the nozzle of the ejector (07) as an entraining power source, the secondary liquid oxygen super-cooler (03) is vacuumized to a target vacuum degree, liquid nitrogen in the liquid nitrogen storage device (06) enters the secondary liquid oxygen super-cooler (03) and forms super-cooled liquid nitrogen by absorbing its own heat through phase change, the high-pressure nitrogen source (08) comprises a plurality of gas cylinders (83) arranged in parallel, the diffuser pipe of the ejector (07) is connected with the high-pressure nitrogen buffer device (82) through the first nitrogen circulation branch pipe (84), the second compression pump (81) is connected with the first nitrogen circulation branch pipe (84), the high-pressure nitrogen buffer device (82) is connected with the inlet end of the gas cylinder (83) through the second nitrogen circulation branch pipe (85), and the outlet end of the gas cylinder (83) is connected with the nozzle of the ejector (07) through the third nitrogen circulation branch pipe (86).

2. The liquid oxygen deep subcooling high flowfill system of claim 1, wherein, The liquid oxygen pump (11), the liquid oxygen pump inlet branch pipe (111), and the liquid oxygen pump outlet branch pipe (112) are further included, the inlet end of the liquid oxygen pump (11) is connected to the liquid oxygen filling main pipeline (05) through the liquid oxygen pump inlet branch pipe (111), the outlet end of the liquid oxygen pump (11) is connected to the liquid oxygen filling main pipeline (05) through the liquid oxygen pump outlet branch pipe (112), the first oxygen filling switch valve (113) is arranged on the liquid oxygen pump inlet branch pipe (111), the connection point of the liquid oxygen pump inlet branch pipe (111) and the liquid oxygen filling main pipeline (05) is a fifth connection point, the connection point of the liquid oxygen pump outlet branch pipe (112) and the liquid oxygen filling main pipeline (05) is a sixth connection point, the fifth connection point and the sixth connection point are located between the conventional liquid oxygen storage device (01) and the first connection point, and the second oxygen filling switch valve (114) is arranged on the liquid oxygen filling main pipeline (05) between the fifth connection point and the sixth connection point.

3. The liquid oxygen deep subcooling high flowfill system of claim 2, wherein, The third oxygen filling switch valve (115), the fourth oxygen filling switch valve (116), and the fifth oxygen filling switch valve (117) are arranged on the liquid oxygen filling main pipeline (05) between the first connection point and the second connection point, between the third connection point and the fourth connection point, and between the sixth connection point and the first connection point, respectively, and the fifth oxygen filling switch valve (117) is a flow regulating valve.

4. The liquid oxygen deep subcooling high flowfill system of claim 3, wherein, The primary liquid oxygen supercooler (02) and the secondary liquid oxygen supercooler (03) are both plate-fin heat exchangers.

5. The liquid oxygen deep subcooling high flowfill system of claim 4, wherein, The first refrigerant inlet and the first refrigerant outlet are arranged on the primary liquid oxygen supercooler (02), the second refrigerant inlet and the second refrigerant outlet are arranged on the secondary liquid oxygen supercooler (03), the liquid nitrogen storage device (06) is connected to the first refrigerant inlet through the primary liquid nitrogen filling branch pipe (25), the primary nitrogen gas output branch pipe (26) is connected to the first refrigerant outlet, the liquid nitrogen in the liquid nitrogen storage device (06) enters the primary liquid oxygen supercooler (02) as a refrigerant medium through the primary liquid nitrogen filling branch pipe (25) and the first refrigerant inlet, exchanges heat with the liquid oxygen in the primary liquid oxygen supercooler (02), the liquid oxygen is cooled to supercooled liquid oxygen after heat exchange, the liquid nitrogen is heated to form nitrogen gas, and the nitrogen gas formed after heating is discharged through the first refrigerant outlet and the primary nitrogen gas output branch pipe (26), the liquid nitrogen storage device (06) is connected to the second refrigerant inlet through the secondary liquid nitrogen filling branch pipe (35), the secondary nitrogen gas output branch pipe (36) is connected to the second refrigerant outlet, and the liquid nitrogen in the liquid nitrogen storage device (06) enters the secondary liquid oxygen supercooler (03) as a refrigerant medium through the secondary liquid nitrogen filling branch pipe (35) and the second refrigerant inlet, exchanges heat with the supercooled liquid oxygen in the secondary liquid oxygen supercooler (03), the supercooled liquid oxygen is cooled to deep supercooled liquid oxygen after heat exchange, the liquid nitrogen is heated to form nitrogen gas, and the nitrogen gas formed after heating is discharged through the second refrigerant outlet and the secondary nitrogen gas output branch pipe (36).

6. The liquid oxygen deep subcooling high flowfill system of claim 5, wherein, The high-pressure nitrogen gas in the high-pressure nitrogen gas source (08) mixes with the nitrogen gas in the secondary liquid oxygen subcooler (03) transmitted through the secondary nitrogen gas output branch (36) to form low-pressure nitrogen gas in the ejector (07), and the low-pressure nitrogen gas is discharged through the diffusion pipe of the ejector (07).

7. The liquid oxygen deep subcooling high flowfill system of claim 6, wherein, The first nitrogen gas circulation branch (84), the second nitrogen gas circulation branch (85), and the third nitrogen gas circulation branch (86) are respectively provided with a first high-pressure nitrogen gas on-off valve (87), a second high-pressure nitrogen gas on-off valve (88), and a third high-pressure nitrogen gas on-off valve (89), and the gas cylinder (83) is provided with a pressure regulating valve.

8. The liquid oxygen deep subcooling high flowfill system of claim 7, wherein, The nitrogen exhaust tower (09) is further included, and the primary nitrogen gas output branch (26) and the diffusion pipe of the ejector (07) are connected to the nitrogen exhaust tower (09), and the connecting pipes between the primary nitrogen gas output branch (26), the diffusion pipe of the ejector (07), and the nitrogen exhaust tower (09) are respectively provided with on-off valves (261, 71).

9. The liquid oxygen deep subcooling high flowfill system of claim 8, wherein, The primary liquid nitrogen filling branch (25) and the secondary liquid nitrogen filling branch (35) are respectively provided with temperature sensors, pressure sensors, and flow meters, the primary liquid nitrogen filling branch (25) is provided with an on-off valve (251) and a flow regulating valve (252), and the secondary liquid nitrogen filling branch (35) is provided with an on-off valve (351) and a flow regulating valve (352).

10. The liquid oxygen deep subcooling high flowfill system of claim 9, wherein, The liquid oxygen filling main pipeline (05) is provided with temperature sensors, pressure sensors, and flow meters between the fourth connecting point and the subcooled liquid oxygen storage device (04) and between the conventional liquid oxygen storage device (01) and the fifth connecting point.

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