An online liquid production methane subcooling refueling process

Abstract

The application discloses an online liquid methane preparation full-subcooling filling process, which comprises a liquid methane storage device, a pressurizing pipeline, a liquid methane subcooling filling device, a filling pipeline, a liquid methane discharge device and a discharge pipeline. The output end of the liquid methane storage device is connected with the input end of the pressurizing pipeline, the output end of the pressurizing pipeline is connected with the input end of the filling pipeline, and the filling pipeline is connected with a first filling branch and a second filling branch after passing through the liquid methane subcooling filling device. The first filling branch is used for being connected with a liquid methane storage tank on an arrow, and the second filling branch is used for being connected with the input end of the discharge pipeline. The output end of the discharge pipeline is connected with the liquid methane discharge device, and a discharge pipeline adjusting valve and a flow measuring instrument are arranged on the discharge pipeline. The system can guarantee stable liquid methane flow, avoid the risk of crystallization of subcooling liquid methane due to too low temperature, and realize full-subcooling filling of liquid methane.

Description

[0001] The present application claims priority to the prior application with the name "An online liquid methane full subcooling filling system and liquid filling device", application number "2024212926005", filed on July 2024. TECHNICAL FIELD

[0002] The present application relates to the technical field of launch vehicle filling, in particular to an online liquid methane full subcooling filling process. BACKGROUND

[0003] With the rapid development of the aerospace industry, various technologies related to rockets have also made great progress. In particular, with the development of low-temperature launch vehicle technology, the new propellant combination of liquid oxygen and liquid methane has attracted much attention and is increasingly used in practice. The current online liquid methane filling system cannot meet the needs of various subcooling flows, and often the discharge system back pressure does not match the rocket standby pressure, causing the liquid methane flow to be unstable, resulting in unstable subcooling liquid methane temperature and even crystallization. Therefore, it is urgent to design an online liquid methane full subcooling filling system to ensure stable liquid methane filling flow while effectively avoiding the crystallization of subcooling liquid methane liquid due to too low temperature during filling. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide an online liquid methane full subcooling filling system that can make the rocket inlet pressure and discharge flow resistance consistent, ensure stable liquid methane flow when switching between the rocket inlet and discharge path, and effectively avoid the risk of crystallization of subcooling liquid methane liquid due to too low temperature, achieving safe filling of full subcooling liquid methane.

[0005] To achieve the above purpose, the present application provides the following technical solution: an online liquid methane full subcooling filling system, comprising a liquid methane storage device, a booster pipeline, a liquid methane subcooling filling device, a filling pipeline, a liquid methane discharge device, and a discharge pipeline, wherein the output end of the liquid methane storage device is connected to the input end of the booster pipeline, the output end of the booster pipeline is connected to the input end of the filling pipeline, the filling pipeline is connected to a first filling branch and a second filling branch after being cooled by the liquid methane subcooling filling device, wherein the first filling branch is used to connect to a rocket liquid methane storage tank, the second filling branch is used to connect to the input end of the discharge pipeline, the output end of the discharge pipeline is connected to the liquid methane discharge device, and the discharge pipeline is provided with a discharge pipeline regulating valve for regulating the flow of liquid methane and a flow measuring instrument for monitoring the flow of liquid methane.

[0006] The liquid methane storage device is used for storing liquid methane and delivering liquid methane to the liquid methane discharge device and the liquid methane storage tank on the rocket through the liquid methane subcooling filling device; the liquid methane subcooling filling device is used for subcooling the delivered liquid methane; and the liquid methane discharge device is used for collecting and discharging liquid methane.

[0007] Further, the liquid methane storage device comprises at least one self-pressurizing device and a ground liquid methane storage tank, the self-pressurizing device is used for adjusting the internal pressure of the ground liquid methane storage tank, and the pipeline of the self-pressurizing device is connected to the ground liquid methane storage tank at both ends, and the pipeline is sequentially provided with a liquid methane pressurizing stop valve, a liquid methane pressurizing regulating valve and a liquid methane self-pressurizing vaporizer from upstream to downstream.

[0008] Further, the filling pipeline is provided with a liquid methane filling flowmeter and a liquid methane inlet valve on the front section filling pipeline between the pressurizing pipeline and the liquid methane subcooling filling device.

[0009] Further, the filling pipeline comprises a rear section filling pipeline downstream of the liquid methane subcooling filling device, one end of the rear section filling pipeline is connected to the front section filling pipeline, the other end of the rear section filling pipeline is connected to the first filling branch and the second filling branch, the rear section filling pipeline is provided with a first temperature measuring instrument for measuring the temperature of the subcooled liquid methane and a filling pipeline regulating valve for regulating the flow of liquid methane.

[0010] Further, the first filling branch is further provided with a second temperature measuring instrument for measuring the temperature of the liquid methane inside the first filling branch and a final filling valve for opening / closing the first filling branch.

[0011] Further, the discharge pipeline is sequentially provided with the flow measuring instrument and the discharge pipeline regulating valve in the direction from upstream to downstream along the discharge pipeline.

[0012] Further, the discharge pipeline is further provided with a discharge pipeline stop valve between the discharge pipeline regulating valve and the flow measuring instrument.

[0013] Further, the liquid methane subcooling filling device is a subcooler, and the liquid methane subcooling filling device further comprises a liquid nitrogen storage tank, a liquid nitrogen input pipeline, a liquid nitrogen output pipeline and a liquid nitrogen discharge device, the output end of the liquid nitrogen storage tank is connected to the input end of the liquid nitrogen input pipeline, the output end of the liquid nitrogen input pipeline is connected to the input end of the subcooler, the output end of the subcooler is connected to the input end of the liquid nitrogen output pipeline, and the output end of the liquid nitrogen output pipeline is connected to the liquid nitrogen discharge device, wherein the liquid nitrogen storage tank delivers liquid nitrogen to the subcooler; and the subcooler is used for adjusting the temperature of the liquid methane passing through the subcooler by heat exchange between liquid nitrogen and liquid methane.

[0014] Further, along the direction from upstream to downstream of the liquid nitrogen input pipeline, a supercooler liquid nitrogen flow meter for detecting liquid nitrogen flow and a supercooler liquid nitrogen regulating valve for regulating liquid nitrogen flow are arranged on the liquid nitrogen input pipeline in sequence.

[0015] Compared with the prior art, the application has at least one of the following beneficial effects:

[0016] The online liquid methane full supercooling filling system of the application is composed of a liquid methane storage device, a booster pipeline, a liquid methane supercooling filling device, a filling pipeline, a liquid methane discharge device and a discharge pipeline.

[0017] The online liquid methane full supercooling filling system of the embodiment of the application can divide the liquid methane into small flow to enter the liquid methane storage tank on the arrow in the precooling stage of the liquid methane storage tank on the arrow, and can simulate the back pressure of the liquid methane storage tank on the arrow and the flow resistance in the discharge pipeline by controlling the opening degree of the discharge pipeline regulating valve in the large liquid methane entering the arrow stage, so that the back pressure of the liquid methane entering the liquid methane storage tank on the arrow is consistent with the flow resistance in the discharge pipeline.

[0018] The application also provides an online liquid methane full supercooling filling process, which provides a liquid methane storage device, a booster pipeline, a liquid methane supercooling filling device, a filling pipeline, a liquid methane discharge device and a discharge pipeline.

[0019] S1, filling pipeline precooling: the filling pipeline and the second filling branch connected with the liquid methane discharge device are precooled by small flow liquid methane for the first time, and liquid nitrogen is input into the liquid methane supercooling filling device.

[0020] S2, online liquid methane supercooling liquid: the filling pipeline and the second filling branch connected with the liquid methane discharge device are precooled by large flow liquid methane for the second time, and the flow of liquid nitrogen in the liquid methane supercooling filling device is adjusted to match the flow of large flow liquid methane, so as to ensure that the temperature of liquid methane in the filling pipeline meets the design requirements.

[0021] S3, pre-cooling the liquid methane tank on the rocket: a part of the supercooled liquid methane prepared on-line is introduced into the liquid methane tank on the rocket through the first filling branch, and another part of the supercooled liquid methane is introduced into the liquid methane discharge device through the second filling branch, and the pre-cooling of the liquid methane tank on the rocket is completed when the liquid level of the liquid methane tank on the rocket reaches a pre-cooling liquid level;

[0022] S4, large-flow supercooling filling of the liquid methane tank on the rocket: the second filling branch into the liquid methane discharge device is closed, and the first filling branch is opened to realize large-flow filling into the liquid methane tank on the rocket; when the liquid level of the liquid methane tank on the rocket reaches a final liquid level, the first filling branch into the liquid methane tank on the rocket is closed, and the second filling branch into the liquid methane discharge device is opened, and the large-flow supercooling filling of the liquid methane tank on the rocket is completed.

[0023] Further, the pre-cooling of the filling pipeline also includes detecting the temperature of the second filling branch by a temperature measuring instrument, so as to confirm that the pre-cooling of the filling pipeline is completed when the temperature in the filling pipeline is equal to or lower than a pre-cooling temperature.

[0024] Further, the supercooled liquid methane prepared on-line specifically includes: adjusting the filling pipeline adjusting valve to stabilize the liquid methane flow at a L / min; automatically controlling the liquid nitrogen adjusting valve of the supercooler to ensure that the liquid nitrogen is supplied to the supercooler at a flow rate of b L / min; when the liquid level of the nitrogen liquid in the shell of the supercooler reaches xm 3 , and the outlet temperature of the supercooler reaches a required supercooling temperature, the liquid level and flow rate of the liquid nitrogen are stabilized.

[0025] Further, the pre-cooling of the liquid methane tank on the rocket specifically includes: controlling the small-flow supercooled liquid methane to enter the liquid methane tank on the rocket, automatically adjusting the filling pipeline adjusting valve to stabilize the flow rate of the filling pipeline at a L / min, and then a part of a1 L / min supercooled liquid methane enters the liquid methane tank on the rocket, and a2 L / min liquid methane enters the liquid methane discharge device through the second filling branch, so as to satisfy a=a1+a2, and the pre-cooling of the liquid methane tank on the rocket is completed when the liquid level of the liquid methane tank on the rocket reaches a pre-cooling liquid level.

[0026] Further, the large-flow supercooling filling of the liquid methane tank on the rocket specifically includes: closing the second filling branch into the liquid methane discharge device to realize large-flow filling into the liquid methane tank on the rocket; when the liquid level of the liquid methane tank on the rocket reaches a final liquid level, the first filling branch into the liquid methane tank on the rocket is closed, and the second filling branch into the liquid methane discharge device is opened, the discharge pipeline adjusting valve is automatically controlled to simulate the back pressure and flow resistance of the rocket, and the flow rate is automatically stabilized at a L / min, and the large-flow supercooling filling of the liquid methane tank on the rocket is completed.

[0027] The online liquid methane preparation full subcooling filling process of the application. Through the cooperation of the discharge pipeline regulating valve and the flow measuring instrument, the flow of the liquid methane flowing through the discharge pipeline can be timely mastered and controlled.

[0028] In the precooling stage of the liquid methane storage tank on the arrow, the liquid methane can be divided into small flow into the liquid methane storage tank on the arrow. In the large amount of liquid methane entering the arrow stage, the opening degree of the discharge pipeline regulating valve can be controlled to simulate the back pressure of the liquid methane storage tank on the arrow equivalent resistance, so that the back pressure of the liquid methane entering the liquid methane storage tank on the arrow and the resistance in the discharge pipeline are consistent; When the liquid methane enters the arrow and the discharge road is switched, the liquid methane flow can also be stabilized, effectively avoiding the risk of crystallization of the subcooled liquid methane liquid due to too low temperature, and realizing the full subcooling filling of liquid methane. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the composition structure diagram of the online liquid methane preparation full subcooling filling system of the application.

[0030] BRIEF DESCRIPTION OF DRAWINGS:

[0031] 1 booster pipeline 2 filling pipeline

[0032] 3 discharge pipeline 4 liquid methane storage tank on the arrow

[0033] 5 discharge pipeline regulating valve 6 flow measuring instrument

[0034] 7 ground liquid methane storage tank 8 liquid methane filling flowmeter

[0035] 9 liquid methane inlet valve 10 first temperature measuring instrument

[0036] 11 filling pipeline regulating valve 12 second temperature measuring instrument

[0037] 13 final filling valve 14 liquid nitrogen storage tank

[0038] 15 liquid nitrogen input pipeline 16 liquid nitrogen output pipeline

[0039] 17 subcooler 18 liquid nitrogen discharge device

[0040] 19 liquid methane booster stop valve 20 liquid methane booster regulating valve

[0041] 21 liquid methane vaporizer 22 liquid outlet stop valve

[0042] 23 liquid outlet pipeline filter 24 subcooler liquid nitrogen flowmeter

[0043] 25 subcooler liquid nitrogen regulating valve DETAILED DESCRIPTION

[0044] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly explain the spirit of the present application with the attached drawings and detailed description. Any person skilled in the art can make changes and modifications to the technology taught by the present application without departing from the spirit and scope of the present application.

[0045] The illustrative embodiments of the present application and their description serve the purpose of explaining the present application. They are, however, not to be taken in their restrictive sense. Similarly, any references are to be included but not limited to.

[0046] As used herein, "first", "second", etc. are not intended to refer to order or sequence, but are used to distinguish elements or operations from one another.

[0047] As used herein, directional terms such as "upper", "lower", "left", "right", "front", "back", etc. are used with reference to the orientation of the figure(s) being described. Thus, the directional terms are used for purposes of explanation and not limitation.

[0048] As used herein, "comprise", "include", "have", "contain", etc. are open-ended terms that are intended to mean comprising but not limited to.

[0049] As used herein, "and / or" includes any or all combinations of one or more of the associated listed items.

[0050] As used herein, the terms "substantially", "approximately", and the like, are used to describe any measurable quantity that can vary slightly from a true value due to measurement or other factors. In general, these terms are used in connection with quantities that can vary by up to 20% in some embodiments, up to 10% in some embodiments, up to 5% in some embodiments, or other amounts in other embodiments. Those skilled in the art will recognize the inherent disci plinary nature of these terms and that the actual value will depend on the context in which they are used.

[0051] Certain words used in the following description are discussed under

[0052] See Figure 1Embodiments of the present application provide an online liquid methane full subcooling filling system. The system comprises a liquid methane storage device, a booster pipeline 1, a liquid methane subcooling filling device, a filling pipeline 2, a liquid methane discharge device and a discharge pipeline 3. The output end of the liquid methane storage device is connected to the input end of the booster pipeline 1, the output end of the booster pipeline 1 is connected to the input end of the filling pipeline 2, and the filling pipeline 2 is connected to a first filling branch and a second filling branch after passing through the liquid methane subcooling filling device. The first filling branch is used to be connected to an on-orbit liquid methane storage tank 4, and the second filling branch is used to be connected to the input end of the discharge pipeline 3, and the output end of the discharge pipeline 3 is connected to the liquid methane discharge device. The discharge pipeline 3 is provided with a discharge pipeline regulating valve 5 for regulating the flow of liquid methane and a flow measuring instrument 6 for monitoring the flow of liquid methane.

[0053] The liquid methane storage device is used to store liquid methane and deliver the liquid methane to the liquid methane discharge device and the on-orbit liquid methane storage tank 4 through the liquid methane subcooling filling device. The liquid methane subcooling filling device is used to subcool the delivered liquid methane. The liquid methane discharge device is used to collect the discharged liquid methane.

[0054] The online liquid methane full subcooling filling system of the present application can timely control the flow of liquid methane flowing through the discharge pipeline 3 through the cooperation of the discharge pipeline regulating valve 5 and the flow measuring instrument 6. In addition, during the precooling stage of the on-orbit liquid methane storage tank 4, the filling system of the present application can split a small flow of liquid methane into the on-orbit liquid methane storage tank 4. During the stage of a large amount of liquid oxygen and liquid methane entering the rocket, the filling system can simulate the back pressure of the on-orbit liquid methane storage tank 4 and the same flow resistance by controlling the opening degree of the discharge pipeline regulating valve 5, so that the back pressure of the liquid methane entering the on-orbit liquid methane storage tank 4 and the flow resistance in the discharge pipeline 3 are consistent. When the liquid methane enters the rocket and the discharge pipeline is switched, the system can also ensure the stable flow of liquid methane, avoid the risk of crystallization of subcooled liquid methane due to too low temperature, and realize full subcooling filling of liquid methane.

[0055] In an embodiment of the present application, in order to ensure the stable output of the liquid methane storage device, for example, the liquid methane storage device comprises a self-boosting device and a ground liquid methane storage tank 7. The self-boosting device can realize self-boosting of the liquid methane storage device by adjusting the internal pressure of the ground liquid methane storage tank 7, so as to ensure that the liquid methane can be stably output to the downstream. The pipeline of the self-boosting device is connected to the ground liquid methane storage tank at both ends. In order to improve the self-boosting effect of the liquid methane, for example, the pipeline is sequentially provided with a liquid methane booster stop valve 19, a liquid methane booster regulating valve 20 and a liquid methane self-boosting vaporizer 21 from upstream to downstream.

[0056] In order to control the flow of liquid methane conveniently and avoid the impurities in the liquid methane from entering the filling pipeline, for example, the liquid methane outlet stop valve 22 and the liquid outlet pipe filter 23 are further arranged on the pressurizing pipeline 1 and the end close to the filling pipeline.

[0057] In the same embodiment, the filling pipeline 2 comprises a rear filling pipeline downstream of the liquid methane subcooling filling device. One end of the rear filling pipeline is connected to the front filling pipeline, and the other end is connected to the first filling branch and the second filling branch (the rear filling pipeline is divided into the first filling branch and the second filling branch after passing through the subcooler, which is used to cool the liquid methane in the filling pipeline). In order to accurately control the temperature of the subcooled liquid methane and timely adjust the flow of the cooled liquid methane, for example, the rear filling pipeline is provided with the first temperature measuring instrument 10 for measuring the temperature of the subcooled liquid methane and the filling pipeline adjusting valve 11 for adjusting the flow of the liquid methane. In addition, the flow of the liquid methane in the filling pipeline can be controlled by the cooperation of the liquid methane filling flowmeter 8 and the filling pipeline adjusting valve 11, and the stability of the liquid methane supply can be improved.

[0058] In addition, in order to control the temperature of the liquid methane entering the liquid methane storage tank 4 on the rocket in real time and control the flow of the liquid methane entering the liquid methane storage tank on the rocket, for example, the first filling branch is further provided with the second temperature measuring instrument 12 for measuring the temperature of the liquid methane in the first filling branch and the final valve 13 for opening / closing the first filling branch.

[0059] In addition, in order to control the flow in the discharge pipeline 3 conveniently and adjust the flow of the discharge pipeline in time, for example, along the direction from upstream to downstream of the discharge pipeline 3, the discharge pipeline 3 is sequentially provided with the flow measuring instrument 6 and the discharge pipeline adjusting valve 5.

[0060] In the embodiment, in order to prevent the backflow of the liquid methane liquid in the discharge pipeline, for example, the discharge pipeline 3 between the discharge pipeline adjusting valve 5 and the flow measuring instrument 6 is further provided with the discharge pipeline stop valve.

[0061] Again referring to Figure 1 For example, the liquid methane subcooling filling device is the subcooler 17. For example, the subcooler 17 can have a structure with a shell side and a tube side. The cooling of the medium to be cooled is realized by the heat exchange between the medium to be cooled and the coolant entering the pipeline in the tube side or the shell side of the filling pipeline in the pipeline inside the subcooler.

[0062] In an embodiment of the present application, the liquid methane subcooling filling device further comprises a liquid nitrogen storage tank 14, a liquid nitrogen input pipeline 15, a liquid nitrogen output pipeline 16, a subcooler 17 and a liquid nitrogen discharge device 18. The output end of the liquid nitrogen storage tank 14 is connected to the input end of the liquid nitrogen input pipeline 15, the output end of the liquid nitrogen input pipeline 15 is connected to the input end of the subcooler 17, the output end of the subcooler 17 is connected to the input end of the liquid nitrogen output pipeline 16, and the output end of the liquid nitrogen output pipeline 16 is connected to the liquid nitrogen discharge device 18. Among them, the liquid nitrogen storage tank 14 delivers liquid nitrogen to the subcooler 17, and the subcooler 17 is used to cool the liquid methane by exchanging heat with the liquid nitrogen.

[0063] It is worth mentioning that in order to accurately control the flow of subcooled liquid nitrogen and timely adjust the flow of liquid nitrogen, for example, along the direction from upstream to downstream of the liquid nitrogen input pipeline 15, the liquid nitrogen input pipeline 15 is sequentially provided with a subcooler liquid nitrogen flow meter 24 for detecting the flow of liquid nitrogen and a subcooler liquid nitrogen regulating valve 25 for adjusting the flow of liquid nitrogen.

[0064] In addition, the online liquid methane full subcooling filling system of the present application can realize full automatic control, reduces the time efficiency and error operation risk brought by manual control, improves the filling safety, also reduces the filling process steps, shortens the filling time, improves the work efficiency and saves the filling cost. In addition, the filling system of the embodiment of the present application can also realize the switching and switching of the filling pipeline, and realize the subcooling precooling or standard precooling of the filling pipeline by increasing the subcooler bypass valve according to different needs of rocket filling.

[0065] The present application also provides an online liquid methane full subcooling filling process. The process relies on the filling system of the present application. As described above, the filling system comprises a liquid methane storage device, a booster pipeline, a liquid methane subcooling filling device, a filling pipeline, a liquid methane discharge device and a discharge pipeline, wherein the output end of the liquid methane storage device is connected to the input end of the booster pipeline, and the output end of the booster pipeline is connected to the input end of the filling pipeline. The filling pipeline is connected to a first filling branch and a second filling branch after passing through the liquid methane subcooling filling device, wherein the first filling branch is used to be connected to a rocket liquid methane storage tank, and the second filling branch is used to be connected to the input end of the discharge pipeline. The output end of the discharge pipeline is connected to the liquid methane discharge device.

[0066] The filling process steps relying on the filling system of the present application are as follows:

[0067] First step, precooling of the filling pipeline: the first precooling of the filling pipeline and the second filling branch communicated with the liquid methane discharge device is carried out by small flow liquid methane, and the liquid nitrogen is input into the liquid methane subcooling filling device;

[0068] The second step is to prepare liquid methane subcooling liquid online. The filling pipeline and the second filling branch connected with the liquid methane discharge device are pre-cooled by high-flow liquid methane for the second time, and the flow rate of liquid nitrogen in the liquid methane subcooling filling device is adjusted to match the flow rate of high-flow liquid methane, so that the temperature of liquid methane in the filling pipeline reaches the design requirement.

[0069] The third step is to pre-cool the liquid methane storage tank on the arrow. Part of the liquid methane subcooled by the online liquid methane subcooling liquid enters the liquid methane storage tank on the arrow through the first filling branch, and the other part of the liquid methane subcooled by the online liquid methane subcooling liquid enters the liquid methane discharge device through the second filling branch. When the liquid level of the liquid methane storage tank on the arrow reaches the pre-cooling liquid level, the pre-cooling of the liquid methane storage tank on the arrow is completed.

[0070] The fourth step is to fill the liquid methane storage tank on the arrow with high-flow subcooled liquid. The second filling branch into the liquid methane discharge device is closed, and the first filling branch is opened to realize high-flow filling into the liquid methane storage tank on the arrow. When the liquid level of the liquid methane storage tank on the arrow reaches the final liquid level, the first filling branch into the liquid methane storage tank on the arrow is closed, and the second filling branch into the liquid methane discharge device is opened, and the high-flow subcooled filling of the liquid methane storage tank on the arrow is completed.

[0071] The online liquid methane full subcooling filling process of the present application can timely master and control the flow rate of liquid methane flowing through the discharge pipeline by cooperation of the discharge pipeline regulating valve and the flow rate measuring instrument, and efficiently complete the subcooling and filling of liquid methane. For example, during the pre-cooling stage of the liquid methane storage tank on the arrow, the liquid methane can be divided into small flow to enter the liquid methane storage tank on the arrow, and during the stage of large amount of liquid methane entering the arrow, the opening degree of the discharge pipeline regulating valve can be controlled to simulate the back pressure of the liquid methane storage tank on the arrow, which is equivalent to the flow resistance of the second filling branch, so that the back pressure of the liquid methane entering the liquid methane storage tank on the arrow is consistent with the flow resistance in the discharge pipeline. In addition, when the liquid methane enters the arrow and the discharge pipeline is switched, the filling method of the present application can also ensure the stable flow rate of liquid methane, effectively avoiding the risk of crystallization of subcooled liquid methane due to too low temperature, and realizing full subcooled filling of liquid methane.

[0072] In addition, the pre-cooling of the filling pipeline also includes detecting the temperature of the second filling branch by the temperature measuring instrument, so that the pre-cooling of the filling pipeline is completed when the temperature in the filling pipeline is equal to or lower than the pre-cooling temperature. Specifically, the liquid methane storage tank can be pressurized to the ground liquid methane storage tank 7 by the self-pressurizing device, and after being pressurized to the working pressure, the valve on the pressurizing pipeline filling pipeline 1 is opened, and the liquid methane passes through the pressurizing pipeline filling pipeline 1, the front filling pipeline 2, the sub-cooler 17, the second filling branch, and the discharge pipeline 3 in turn, and then enters the liquid methane discharge device, and the pre-cooling of the filling pipeline 2 is completed. In this pre-cooling process, the temperature of the filling pipeline 2 (the filling pipeline cooled after the sub-cooler) is detected by the second temperature measuring instrument 12, and when the temperature detected by the second temperature measuring instrument 12 is equal to or lower than the pre-cooling temperature, the pre-cooling of the filling pipeline is completed.

[0073] The on-line liquid methane sub-cooling liquid specifically includes: adjusting the filling pipeline adjusting valve to stabilize the liquid methane flow at a L / min; automatically controlling the sub-cooler liquid nitrogen adjusting valve according to the liquid methane flow stabilization a L / min to ensure that the liquid nitrogen is supplemented to the sub-cooler at a flow rate of b L / min; when the liquid level of the sub-cooler shell nitrogen reaches xm 3 , and the outlet temperature of the sub-cooler reaches the required sub-cooling temperature, the liquid nitrogen level and flow rate are stabilized. That is, the liquid methane storage tank is pressurized by the self-pressurizing device, and the liquid methane is delivered to the liquid methane discharge device by the sub-cooler; the liquid methane flow is adjusted to a L / min by the filling pipeline adjusting valve 11, and the sub-cooler liquid nitrogen adjusting valve 25 is automatically controlled to ensure that the liquid nitrogen is supplemented to the sub-cooler at a flow rate of b L / min; when the liquid level of the sub-cooler shell (the inside of the shell) nitrogen reaches xm 3 , and the outlet temperature of the sub-cooler reaches the required sub-cooling temperature, the liquid nitrogen level and flow rate are stabilized. Wherein, a, b and x represent numerical values, and the stable values are obtained through a large amount of experimental data and simulation.

[0074] The pre-cooling of the liquid methane tank on the rocket specifically includes: controlling the small-flow super-cooled liquid methane to enter the liquid methane tank on the rocket, automatically adjusting the filling pipe regulating valve to ensure that the flow of the filling pipe is stable at a L / min, then a1 L / min of the super-cooled liquid methane enters the liquid methane tank on the rocket, a2 L / min of the liquid methane enters the liquid methane discharge device through the second filling branch, and a = a1 + a2 is met, and the pre-cooling of the liquid methane tank on the rocket is completed when the liquid level of the liquid methane tank on the rocket reaches a pre-cooled liquid level. Specifically, the small-flow super-cooled (standard liquid methane) liquid methane is controlled to enter the liquid methane tank 4 on the rocket. The final filling valve 13 is opened, and the filling pipe regulating valve 11 is automatically adjusted to ensure that the flow of the filling pipe is stable at a L / min, while a1 L / min of the super-cooled liquid methane enters the liquid methane tank 4 on the rocket, and a2 L / min of the liquid methane enters the liquid methane discharge device (where a = a1 + a2). The pre-cooling of the liquid methane tank 4 on the rocket is completed when the liquid level of the liquid methane tank 4 on the rocket reaches a pre-cooled liquid level.

[0075] The large-flow super-cooled filling of the liquid methane tank on the rocket specifically includes: closing the second filling branch into the liquid methane discharge device to realize large-flow into the liquid methane tank on the rocket; when the liquid level of the liquid methane tank on the rocket reaches a final liquid level, the first filling branch into the liquid methane tank on the rocket is closed, and the second filling branch into the liquid methane discharge device is opened. In this process, the discharge pipe regulating valve is automatically controlled to simulate the back pressure and flow resistance of the rocket, and the flow is automatically controlled to be stable at a L / (the discharge pipe regulating valve is automatically controlled to simulate the back pressure and flow resistance of the rocket to ensure that the flow of the liquid methane through the second filling branch after the filling of the liquid methane tank on the rocket is consistent with the flow into the liquid methane tank on the rocket, avoiding large fluctuations in the flow in the second filling branch when the first filling branch and the second filling branch are switched), and the large-flow super-cooled filling of the liquid methane tank on the rocket is completed. That is, the large-flow super-cooled liquid methane is controlled to enter the liquid methane tank 4 on the rocket, the discharge path stop valve (provided on the discharge pipe 3 between the discharge pipe regulating valve 5 and the flow measuring instrument 6) is closed, and the final filling valve 13 is maintained to be opened; the filling pipe regulating valve 11 is controlled to stabilize the flow of the pipe at a L / min to realize large-flow into the liquid methane tank 4 on the rocket; when the liquid level of the liquid methane tank 4 on the rocket reaches a final liquid level, the final filling valve is closed, and the discharge path stop valve is opened; the discharge pipe regulating valve 5 is automatically controlled to simulate the back pressure and flow resistance of the rocket, and the flow is automatically controlled to be stable at a L / min, and the large-flow super-cooled filling of the liquid methane tank 4 on the rocket is completed.

[0076] The above embodiments can be combined with each other, and have corresponding technical effects.

[0077] The above description is only a specific implementation of the present application, and any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.

Claims

1. An online liquid methane subcooled fill process using a liquid methane subcooled fill system, characterized by, The liquid methane subcooling filling system comprises a liquid methane storage device, a booster pipeline, a liquid methane subcooling filling device, a filling pipeline, a liquid methane discharge device and a discharge pipeline, wherein the output end of the liquid methane storage device is connected with the input end of the booster pipeline, the output end of the booster pipeline is connected with the input end of the filling pipeline, the filling pipeline is connected with a first filling branch and a second filling branch after passing through the liquid methane subcooling filling device, the first filling branch is used for being connected with a liquid methane storage tank on a rocket, the second filling branch is used for being connected with the input end of the discharge pipeline, the output end of the discharge pipeline is connected with the liquid methane discharge device, the discharge pipeline is provided with a discharge pipeline adjusting valve for adjusting the flow of liquid methane and a flow measuring instrument for monitoring the flow of liquid methane; S1, filling pipeline precooling: the filling pipeline and the second filling branch communicated with the liquid methane discharge device are pre-cooled for the first time by small-flow liquid methane, and liquid nitrogen is input into the liquid methane subcooling filling device; S2, on-line liquid methane subcooling liquid: the filling pipeline and the second filling branch communicated with the liquid methane discharge device are pre-cooled for the second time by large-flow liquid methane, and the flow of liquid nitrogen in the liquid methane subcooling filling device is adjusted to match the flow of large-flow liquid methane, so that the temperature of liquid methane in the filling pipeline reaches the design requirement; S3, precooling of the liquid methane storage tank on the rocket: part of the on-line liquid methane subcooling liquid enters the liquid methane storage tank on the rocket through the first filling branch, and the other part of the on-line liquid methane subcooling liquid enters the liquid methane discharge device through the second filling branch, and the precooling of the liquid methane storage tank on the rocket is completed when the liquid level of the liquid methane storage tank on the rocket reaches the precooling level; wherein the precooling of the liquid methane storage tank on the rocket specifically comprises: controlling small-flow subcooling liquid methane to enter the liquid methane storage tank on the rocket, automatically adjusting the filling pipeline adjusting valve to ensure that the flow of the filling pipeline is stable at a L / min, then part of a1 L / min subcooling liquid methane enters the liquid methane storage tank on the rocket, a2 L / min liquid methane enters the liquid methane discharge device through the second filling branch, and a=a1+a2 is satisfied, and the precooling of the liquid methane storage tank on the rocket is completed when the liquid level of the liquid methane storage tank on the rocket reaches the precooling level; S4, large-flow subcooling filling of the liquid methane storage tank on the rocket: the second filling branch entering the liquid methane discharge device is closed, and the first filling branch is opened to realize large-flow subcooling filling of the liquid methane storage tank on the rocket; when the liquid level of the liquid methane storage tank on the rocket reaches the final liquid level, the first filling branch entering the liquid methane storage tank on the rocket is closed, and the second filling branch entering the liquid methane discharge device is opened, the discharge pipeline adjusting valve is automatically controlled to simulate the back pressure and flow resistance of the rocket, and the flow is automatically controlled to be stable at a L / min, and the large-flow subcooling filling of the liquid methane storage tank on the rocket is completed.

2. The on-line liquid production, full subcooling, methane fill process of claim 1 wherein, The precooling of the filling pipeline also comprises detecting the temperature of the second filling branch by a temperature measuring instrument, so as to confirm that the temperature in the filling pipeline is equal to or lower than the precooling temperature, and the precooling of the filling pipeline is completed.

3. The online-liquified-methane subcooling fueling process of claim 1 wherein, The liquid methane subcooling liquid specifically comprises: adjusting the filling pipeline adjusting valve to adjust the liquid methane flow to be stable at aL / min; automatically controlling the subcooler liquid nitrogen adjusting valve according to the liquid methane flow stability aL / min to ensure that the liquid nitrogen is supplied to the subcooler at a preset flow; when the liquid level of the subcooler shell nitrogen reaches a preset value, and the outlet temperature of the subcooler reaches the required subcooling temperature, the liquid nitrogen level and flow are stabilized.

4. The online-liquified-methane full-subcooling refueling process of claim 1, wherein, The liquid methane storage device comprises at least one self-pressurizing device and a library area liquid methane storage tank, the self-pressurizing device is used for adjusting the internal pressure of the library area liquid methane storage tank, the pipeline of the self-pressurizing device is connected to the library area liquid methane storage tank at both ends, and the pipeline of the self-pressurizing device is sequentially provided with a liquid methane pressurizing stop valve, a liquid methane pressurizing adjusting valve and a liquid methane self-pressurizing vaporizer from upstream to downstream.

5. The on-line liquid production, full subcooling, methane fill process of claim 1 wherein, The filling pipeline is provided with a liquid methane filling flowmeter and a liquid methane inlet valve on the front section of the filling pipeline between the pressurizing pipeline and the liquid methane subcooling filling device, the filling pipeline comprises a rear section of the filling pipeline downstream of the liquid methane subcooling filling device, one end of the rear section of the filling pipeline is connected to the front section of the filling pipeline, the other end is connected to the first filling branch and the second filling branch, and the rear section of the filling pipeline is provided with a first temperature measuring instrument for measuring the temperature of the subcooled liquid methane and a filling pipeline adjusting valve for adjusting the liquid methane flow.

6. The on-line liquid production, full subcooling, methane fill process of claim 4 wherein, The first filling branch is further provided with a second temperature measuring instrument for measuring the temperature of the liquid methane in the first filling branch and a final valve for opening / closing the first filling branch; the discharge pipeline is sequentially provided with the flow measuring instrument and the discharge pipeline adjusting valve from upstream to downstream along the direction of the discharge pipeline, and the discharge pipeline is further provided with a discharge pipeline stop valve between the discharge pipeline adjusting valve and the flow measuring instrument.

7. The on-line liquid production, full subcooling, methane fill process of claim 4 wherein, The liquid methane subcooling filling device is a subcooler, the liquid methane subcooling filling device further comprises a liquid nitrogen storage tank, a liquid nitrogen input pipeline, a liquid nitrogen output pipeline and a liquid nitrogen discharge device; the output end of the liquid nitrogen storage tank is connected to the input end of the liquid nitrogen input pipeline, the output end of the liquid nitrogen input pipeline is connected to the input end of the subcooler, the output end of the subcooler is connected to the input end of the liquid nitrogen output pipeline, and the output end of the liquid nitrogen output pipeline is connected to the liquid nitrogen discharge device, wherein the liquid nitrogen storage tank delivers liquid nitrogen to the subcooler; the subcooler is used for adjusting the temperature of the liquid methane passing through the subcooler by heat exchange between the liquid nitrogen and the liquid methane; the liquid nitrogen input pipeline is sequentially provided with a subcooler liquid nitrogen flowmeter for detecting the liquid nitrogen flow and a subcooler liquid nitrogen adjusting valve for adjusting the liquid nitrogen flow from upstream to downstream along the direction of the liquid nitrogen input pipeline.

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