Full-supercooling filling system and process for on-line preparation of liquid methane

Abstract

The invention discloses an online liquid methane preparation full-supercooling filling system and process. The system comprises a liquid methane storage device, a pressurizing pipeline, a liquid methane supercooling filling device, a filling pipeline, a liquid methane discharging device and a discharging pipeline. Wherein 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 respectively connected with a first filling branch and a second filling branch after passing through the liquid methane supercooling filling device. The first filling branch is used for being connected with a liquid methane storage tank on a rocket, and the second filling branch is used for being connected with the input end of the discharging pipeline. The output end of the discharging pipeline is connected with the liquid methane discharging device, and a discharging pipeline adjusting valve and a flow measuring instrument are arranged on the discharging pipeline. The system can ensure that the liquid methane flow is stable, meanwhile, the risk of crystallization caused by too low temperature of the supercooled liquid methane is avoided, and full supercooled filling of the liquid methane is achieved.

Description

[0001] This application claims priority to the prior application entitled “An online liquid methane fully subcooled filling system and liquid filling device” filed in July 2024, with application number “2024212926005”. Technical Field

[0002] The invention relates to the technical field of carrier rocket filling, and in particular to an online liquid methane fully subcooled filling system and process. Background Art

[0003] With the rapid development of the aerospace industry, various technologies involved in the rocket field have also achieved rapid progress. In particular, with the development of cryogenic launch vehicle technology, the new propellant combination of liquid oxygen and liquid methane has attracted widespread attention and is increasingly being used in practice. At present, the online liquid methane filling system cannot meet a variety of supercooling flow rates, and the liquid methane flow rate is often unstable due to the inconsistency between the back pressure of the discharge system and the backup pressure of the rocket, resulting in unstable temperature and even crystallization of the supercooled liquid methane. Therefore, it is urgent to design an online liquid methane full supercooling filling system to ensure the stability of the liquid methane filling flow while effectively avoiding the crystallization of the supercooled liquid methane due to too low temperature during the filling process. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an online liquid methane fully subcooled filling system, which can make the inlet back pressure and the discharge flow resistance consistent, ensure the stability of the liquid methane flow when switching between the inlet and discharge paths, and effectively avoid the risk of crystallization of supercooled liquid methane due to too low temperature, thereby realizing fully subcooled and safe filling of liquid methane.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an online liquid methane fully subcooled filling system, comprising a liquid methane storage device, a boosting pipeline, a liquid methane subcooled 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 boosting pipeline, the output end of the boosting pipeline is connected to the input end of the filling pipeline, and the filling pipeline is connected to a first filling branch and a second filling branch after being cooled by the liquid methane subcooled filling device, wherein the first filling branch is used to be connected to the arrow-mounted liquid methane storage tank, 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, and a discharge pipeline regulating valve for adjusting the liquid methane flow rate and a flow meter for monitoring the liquid methane flow rate are provided on the discharge pipeline;

[0006] The liquid methane storage device is used to store liquid methane and transport liquid methane to the liquid methane discharge device and the arrow-mounted liquid methane storage tank through the liquid methane supercooling filling device; the liquid methane supercooling filling device is used to supercool the transported liquid methane; the liquid methane discharge device is used to collect the discharged liquid methane.

[0007] Furthermore, the liquid methane storage device includes at least one self-pressurizing device and a ground liquid methane storage tank, the self-pressurizing device is used to adjust the internal pressure of the ground liquid methane storage tank, the two ends of the pipeline of the self-pressurizing device are respectively connected to the ground liquid methane storage tank, and the pipeline is sequentially provided with a liquid methane boosting stop valve, a liquid methane boosting regulating valve, and a liquid methane self-pressurizing vaporizer from upstream to downstream.

[0008] Furthermore, a liquid methane filling flowmeter and a liquid methane inlet valve are provided on the front section of the filling pipeline between the boosting pipeline and the liquid methane supercooling filling device.

[0009] Furthermore, the filling pipeline includes a rear-end filling pipeline downstream of the liquid methane supercooling filling device, one end of the rear-end filling pipeline is connected to the front-end filling pipeline, and the other end is connected to the first filling branch and the second filling branch. The rear-end filling pipeline is provided with a first temperature measuring instrument for measuring the temperature of the supercooled liquid methane and a filling pipeline regulating valve for adjusting the liquid methane flow rate.

[0010] Furthermore, the first filling branch is also provided with a second temperature measuring instrument for measuring the temperature of liquid methane inside the first filling branch and an end-filling valve for opening / closing the first filling branch.

[0011] Furthermore, along the direction from upstream to downstream of the discharge pipeline, the discharge pipeline is sequentially provided with the flow meter and the discharge pipeline regulating valve.

[0012] Furthermore, a discharge pipeline stop valve is also provided on the discharge pipeline between the discharge pipeline regulating valve and the flow meter.

[0013] Furthermore, the liquid methane supercooling filling device is a supercooler, and the liquid methane supercooling filling device also includes 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 supercooler, the output end of the supercooler 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 transports liquid nitrogen to the supercooler; the supercooler is used to exchange heat with liquid methane through liquid nitrogen to adjust the temperature of the liquid methane passing through the supercooler.

[0014] Furthermore, along the upstream to downstream direction of the liquid nitrogen input pipeline, a subcooler liquid nitrogen flowmeter for detecting the liquid nitrogen flow rate and a subcooler liquid nitrogen regulating valve for regulating the liquid nitrogen flow rate are sequentially arranged on the liquid nitrogen input pipeline.

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

[0016] The online liquid methane fully subcooled filling system of the present application is composed of a liquid methane storage device, a booster pipeline, a liquid methane subcooled filling device, a filling pipeline, a liquid methane discharge device and a discharge pipeline. The filling system cooperates with the discharge pipeline regulating valve and the flow meter to timely grasp and control the flow of liquid methane flowing through the discharge pipeline.

[0017] The online liquid methane fully subcooled filling system of the embodiment of the present application can divert liquid methane into a small flow to enter the liquid methane storage tank on the arrow during the pre-cooling stage of the liquid methane storage tank on the arrow, and can simulate the back pressure and flow resistance of the liquid methane storage tank on the arrow by controlling the opening of the discharge pipeline regulating valve during the stage of large-scale liquid methane entering the arrow, 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; when the liquid methane inlet and discharge routes are switched, the liquid methane flow rate can also be guaranteed to be stable, effectively avoiding the risk of crystallization of supercooled liquid methane due to too low temperature, thereby realizing full subcooled filling of liquid methane.

[0018] The present invention also provides an online liquid methane full subcooling filling process, which provides a liquid methane storage device, a boosting 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 boosting pipeline, the output end of the boosting pipeline is connected to the input end of the filling pipeline, and the filling pipeline is respectively 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 the arrow liquid methane storage tank, the second filling branch is used to be connected to the input end of the discharge pipeline, and the output end of the discharge pipeline is connected to the liquid methane discharge device.

[0019] S1, precooling the filling pipeline: precooling the filling pipeline connected to the liquid methane discharge device and the second filling branch for the first time by using a small flow of liquid methane, and inputting liquid nitrogen into the liquid methane supercooling filling device;

[0020] S2, online preparation of liquid methane supercooled liquid: precooling the filling pipeline connected to the liquid methane discharge device and the second filling branch for the second time by using large-flow liquid methane, and adjusting the liquid nitrogen flow in the liquid methane supercooling filling device to match the flow of large-flow liquid methane to ensure that the liquid methane temperature in the filling pipeline meets the design requirements;

[0021] S3, precooling the arrow-mounted liquid methane storage tank: a portion of the supercooled liquid methane of the online liquid methane supercooled liquid enters the arrow-mounted liquid methane storage tank through the first filling branch, and another portion of the supercooled liquid methane enters the liquid methane discharge device through the second filling branch. When the arrow-mounted liquid methane storage tank reaches the precooling liquid level, the arrow-mounted liquid methane storage tank is precooled;

[0022] S4, large-flow supercooling filling of the liquid methane tank on the arrow; closing the second filling branch entering the liquid methane discharge device, and opening the first filling branch to allow a large flow of liquid methane into the liquid methane tank on the arrow; when the liquid level of the liquid methane tank on the arrow reaches the final liquid level, closing the first filling branch entering the liquid methane tank on the arrow, and opening the second filling branch entering the liquid methane discharge device, to complete the large-flow supercooling filling of the liquid methane tank on the arrow.

[0023] Furthermore, the precooling of the filling pipeline also includes detecting the temperature of the second filling branch by a temperature measuring instrument to confirm that the precooling of the filling pipeline is completed when the temperature in the filling pipeline is equal to or lower than the precooling temperature.

[0024] Furthermore, the production of liquid methane subcooled liquid specifically includes: adjusting the filling pipeline regulating valve to stabilize the liquid methane flow rate at a L / min; automatically controlling the subcooler liquid nitrogen regulating valve according to the stable liquid methane flow rate at a L / min to ensure that liquid nitrogen is replenished to the subcooler at a flow rate of b L / min; when the liquid level of the nitrogen liquid in the shell side of the subcooler reaches xm 3 , when the outlet temperature of the subcooler reaches the required subcooling temperature, stabilize the liquid nitrogen level and flow rate.

[0025] Furthermore, precooling the liquid methane tank on the arrow specifically includes: controlling a small flow of supercooled liquid methane to enter the liquid methane tank on the arrow, automatically adjusting the filling pipe regulating valve to ensure that the filling pipe flow is stable at a L / min, and then a part of a1 L / min supercooled liquid methane enters the liquid methane tank on the arrow, and a2 L / min liquid methane enters the liquid methane discharge device through the second filling branch, satisfying a=a1+a2, and the precooling of the liquid methane tank on the arrow is completed when the liquid methane tank on the arrow reaches the precooling liquid level.

[0026] Furthermore, the large-flow supercooled filling of the liquid methane tank on the arrow specifically includes: closing the second filling branch entering the liquid methane discharge device to achieve a large flow into the liquid methane tank on the arrow; when the liquid level of the liquid methane tank on the arrow reaches the final liquid level, closing the first filling branch entering the liquid methane tank on the arrow, and opening the second filling branch entering the liquid methane discharge device, automatically controlling the discharge pipeline regulating valve to simulate the rocket back pressure and flow resistance, and automatically controlling the flow rate to be stable at a L / min, thereby completing the large-flow supercooled filling of the liquid methane tank on the arrow.

[0027] The online liquid methane full subcooling filling process of the present application can timely grasp and regulate the flow of liquid methane flowing through the discharge pipeline through the cooperation of the discharge pipeline regulating valve and the flow measuring instrument.

[0028] During the pre-cooling stage of the liquid methane tank on the arrow, the liquid methane can be diverted into a small flow rate to enter the liquid methane tank on the arrow. During the stage of large-scale liquid methane entering the arrow, the back pressure of the liquid methane tank on the arrow can be simulated by controlling the opening of the discharge pipeline regulating valve to simulate the flow resistance, so that the back pressure of the liquid methane entering the liquid methane tank on the arrow is consistent with the flow resistance in the discharge pipeline; when the liquid methane inlet and discharge routes are switched, the liquid methane flow rate can also be guaranteed to be stable, effectively avoiding the risk of crystallization of supercooled liquid methane due to low temperature, thereby realizing full supercooling filling of liquid methane. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a simplified structural diagram of the online liquid methane full subcooling and filling system.

[0030] Description of reference numerals:

[0031] 1 booster line 2 filling line

[0032] 3 discharge pipeline 4 arrow liquid methane tank

[0033] 5. Discharge pipeline regulating valve 6. Flow measuring instrument

[0034] 7 Ground liquid methane storage tank 8 Liquid methane filling flow meter

[0035] 9 Liquid methane inlet valve 10 First temperature measuring instrument

[0036] 11 Filling pipeline regulating valve 12 Second temperature measuring instrument

[0037] 13 end 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 boost stop valve 20 Liquid methane boost regulating valve

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

[0042] 23 Liquid outlet pipe filter 24 Subcooler liquid nitrogen flow meter

[0043] 25 Subcooler liquid nitrogen regulating valve DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention more clearly understood, the spirit of the contents disclosed by the present invention will be clearly explained with the accompanying drawings and detailed descriptions below. After understanding the embodiments of the contents of the present invention, any technician in the relevant technical field can change and modify the techniques taught by the contents of the present invention without departing from the spirit and scope of the contents of the present invention.

[0045] The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention. In addition, elements / components with the same or similar reference numerals used in the drawings and embodiments are used to represent the same or similar parts.

[0046] The terms “first”, “second”, etc. used in this document do not particularly refer to an order or sequence, nor are they used to limit the present invention. They are only used to distinguish elements or operations described with the same technical terms.

[0047] The directional terms used in this document, such as up, down, left, right, front or back, etc., are only used to refer to the directions of the drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0048] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0049] As used herein, "and / or" includes any or all combinations of the items described.

[0050] The terms "substantially" and "approximately" used herein are used to modify any quantity or error that may vary slightly, but these slight changes or errors do not change their essence. Generally speaking, the range of slight changes or errors modified by such terms may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. Those skilled in the art should understand that the aforementioned values ​​can be adjusted according to actual needs and are not limited thereto.

[0051] Certain terms used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present application.

[0052] See also Figure 1, an embodiment of the present invention provides an online liquid methane fully subcooled filling system. The system comprises a liquid methane storage device, a boosting pipeline 1, a liquid methane subcooled 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 boosting pipeline 1, the output end of the boosting pipeline 1 is connected to the input end of the filling pipeline 2, and the filling pipeline 2 is connected to the first filling branch and the second filling branch after passing through the liquid methane subcooled filling device. The first filling branch is used to connect to the arrow liquid methane storage tank 4, the second filling branch is used to connect 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 adjusting the liquid methane flow rate and a flow meter 6 for monitoring the liquid methane flow rate.

[0053] The liquid methane storage device is used to store liquid methane and deliver liquid methane to the liquid methane discharge device and the arrow-mounted liquid methane storage tank 4 through the liquid methane supercooling filling device. The liquid methane supercooling filling device is used to supercool 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 meter 6. In addition, in the pre-cooling stage of the on-arrow liquid methane storage tank 4, the filling system of the present application can divert a small flow of liquid methane into the on-arrow liquid methane storage tank 4. In the stage where liquid oxygen and methane are introduced into the arrow in large quantities, the filling system can simulate the back pressure of the on-arrow liquid methane storage tank 4 and the same flow resistance by controlling the opening of the discharge pipeline regulating valve 5, so that the back pressure of liquid methane entering the on-arrow liquid methane storage tank 4 is consistent with the flow resistance in the discharge pipeline 3. When the liquid methane inlet and discharge routes are switched, the system can also ensure the stability of the liquid methane flow, avoid the risk of crystallization of supercooled liquid methane due to too low temperature, and realize full subcooling filling of liquid methane.

[0055] In one embodiment of the present application, in order to ensure the stable output of liquid methane from the liquid methane storage device, for example, the liquid methane storage device includes a self-pressurizing device and a ground liquid methane storage tank 7. The self-pressurizing device can achieve self-pressurization of the liquid methane storage device by adjusting the internal pressure of the ground liquid methane storage tank 7, ensuring that the liquid methane can be stably output downstream. Among them, both ends of the pipeline of the self-pressurizing device are respectively connected to the ground liquid methane storage tank. In order to improve the self-pressurization effect of liquid methane, for example, the pipeline is sequentially provided with a liquid methane pressurization stop valve 19, a liquid methane pressurization regulating valve 20, and a liquid methane self-pressurizing vaporizer 21 from upstream to downstream.

[0056] In order to facilitate the control of the liquid methane flow rate and prevent impurities in the liquid methane from entering the filling pipeline, for example, the boosting pipeline 1 and one end close to the filling pipeline are also provided with a liquid methane outlet shut-off valve 22 and a liquid outlet pipe filter 23. In addition, in actual application, the number of self-boosting devices and ground liquid methane storage tanks can be increased according to the number of rocket stages (the more stages, the more liquid methane is required). It should be noted that in order to accurately control the liquid methane flow rate in the filling pipeline 2 and facilitate the adjustment of the liquid methane flow rate, for example, a liquid methane filling flowmeter 8 and a liquid methane inlet valve 9 are provided on the front section of the filling pipeline 2 between the boosting pipeline 1 and the liquid methane supercooling filling device.

[0057] In the same embodiment, the filling pipeline 2 includes a rear-end filling pipeline downstream of the liquid methane supercooling filling device. One end of the rear-end filling pipeline is connected to the front-end filling pipeline, and the other end is connected to the first filling branch and the second filling branch (the rear-end filling pipeline is divided into the first filling branch and the second filling branch after passing through the supercooler, and the supercooler is used to cool the liquid methane inside the filling pipeline). In order to accurately control the temperature of the liquid methane after supercooling and to timely adjust the flow of the cooled liquid methane, for example, the rear-end filling pipeline is provided with a first temperature measuring instrument 10 for measuring the temperature of the liquid methane after supercooling and a filling pipeline regulating valve 11 for adjusting the flow of liquid methane. In addition, the liquid methane filling flowmeter 8 cooperates with the filling pipeline regulating valve 11 to control the flow of liquid methane in the filling pipeline and improve the stability of the liquid methane supply.

[0058] In addition, in order to control the temperature of the liquid methane entering the arrow liquid methane storage tank 4 in real time and control the liquid methane flow entering the arrow liquid methane storage tank, for example, the first filling branch is also provided with a second temperature measuring instrument 12 for measuring the temperature of the liquid methane inside the first filling branch and an end-filling valve 13 for opening / closing the first filling branch.

[0059] In addition, in order to facilitate the control of the flow in the discharge pipeline 3 and timely adjust the flow of the discharge pipeline, for example, along the direction from upstream to downstream of the discharge pipeline 3, the discharge pipeline 3 is sequentially provided with a flow meter 6 and a discharge pipeline regulating valve 5.

[0060] In this embodiment, in order to prevent the backflow of liquid methane in the discharge pipeline, for example, a discharge pipeline stop valve is further provided on the discharge pipeline 3 between the discharge pipeline regulating valve 5 and the flow meter 6 .

[0061] See again Figure 1 For example, the liquid methane subcooling filling device is a subcooler 17. For example, the subcooler 17 may be a structure having a shell side and a tube side, and the cooling medium to be cooled is achieved by allowing the medium to be cooled and the coolant to enter the tube side through the filling pipeline or the shell side and the inner pipeline of the subcooler for heat exchange.

[0062] In one embodiment of the present application, the liquid methane supercooling filling device further comprises a liquid nitrogen storage tank 14, a liquid nitrogen input pipeline 15, a liquid nitrogen output pipeline 16, a supercooler 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 supercooler 17, the output end of the supercooler 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 transports liquid nitrogen to the supercooler 17, and the supercooler 17 is used to cool the liquid methane by heat exchange between liquid nitrogen and liquid methane.

[0063] It is worth mentioning that in order to accurately control the flow rate of liquid nitrogen after supercooling and to timely adjust the flow rate of liquid nitrogen, for example, in the direction from upstream to downstream of the liquid nitrogen input pipeline 15, a subcooler liquid nitrogen flowmeter 24 for detecting the flow rate of liquid nitrogen and a subcooler liquid nitrogen regulating valve 25 for adjusting the flow rate of liquid nitrogen are sequentially arranged on the liquid nitrogen input pipeline 15.

[0064] In addition, the online liquid methane fully subcooled filling system of the present application can realize fully automatic control, reduce the timeliness and erroneous operation risks caused by manual control, improve filling safety, reduce the filling process steps, shorten the filling time, improve work efficiency, and save filling costs. In addition, the filling system of the embodiment of the present application can also realize the switching and switching of the filling pipeline by adding a subcooler bypass valve according to the different needs of rocket filling, and realize the supercooling precooling or standard precooling of the filling pipeline.

[0065] The present invention also provides an online liquid methane full supercooling filling process. The process is implemented based on the filling system of the present application. As mentioned above, the filling system includes a liquid methane storage device, a boosting pipeline, a liquid methane supercooling 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 boosting pipeline, and the output end of the boosting pipeline is connected to the input end of the filling pipeline. After passing through the liquid methane supercooling filling device, the filling pipeline is respectively connected to a first filling branch and a second filling branch, wherein the first filling branch is used to connect to the arrow-mounted liquid methane storage tank, and 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.

[0066] The specific filling process steps of the filling system based on this application are as follows:

[0067] The first step is to precool the filling pipeline: precool the filling pipeline connected to the liquid methane discharge device and the second filling branch for the first time by using a small flow of liquid methane, and input liquid nitrogen into the liquid methane supercooling filling device;

[0068] Step 2: Online preparation of liquid methane supercooled liquid: precooling the filling pipeline connected to the liquid methane discharge device and the second filling branch for the second time by using large-flow liquid methane, and adjusting the liquid nitrogen flow in the liquid methane supercooling filling device to match the flow of large-flow liquid methane to ensure that the liquid methane temperature in the filling pipeline meets the design requirements;

[0069] Step 3: precooling the arrow-mounted liquid methane tank: a portion of the supercooled liquid methane of the online liquid methane supercooled liquid enters the arrow-mounted liquid methane tank through the first filling branch, and another portion of the supercooled liquid methane enters the liquid methane discharge device through the second filling branch. When the arrow-mounted liquid methane tank reaches the precooling liquid level, the arrow-mounted liquid methane tank is precooled;

[0070] The fourth step is to perform high-flow supercooled filling of the liquid methane tank on the Arrow; close the second filling branch entering the liquid methane discharge device, and at the same time open the first filling branch to allow a large flow of liquid methane into the liquid methane tank on the Arrow; when the liquid level of the liquid methane tank on the Arrow reaches the final liquid level, close the first filling branch entering the liquid methane tank on the Arrow, and at the same time open the second filling branch entering the liquid methane discharge device to complete the high-flow supercooled filling of the liquid methane tank on the Arrow.

[0071] The online liquid methane full supercooling filling process of the present application can timely grasp and control the flow of liquid methane flowing through the discharge pipeline through the cooperation of the discharge pipeline regulating valve and the flow meter, and efficiently complete the supercooling and filling of liquid methane. For example, in the pre-cooling stage of the liquid methane storage tank on the arrow, the liquid methane can be diverted into a small flow to enter the liquid methane storage tank on the arrow. In the stage of large-scale entry of liquid methane into the arrow, the back pressure of the liquid methane storage tank on the arrow can be simulated by controlling the opening of the discharge pipeline regulating valve to be equivalent to the flow resistance of the second filling branch, so that the back pressure of 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 entry and discharge paths are switched, the filling method of the present application can also ensure the stability of the liquid methane flow, effectively avoiding the risk of crystallization of supercooled liquid methane due to too low temperature, and realizing full supercooling filling of liquid methane.

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

[0073] The online production of liquid methane subcooled liquid specifically includes: adjusting the filling pipeline regulating valve to stabilize the liquid methane flow rate at aL / min; automatically controlling the subcooler liquid nitrogen regulating valve according to the stable liquid methane flow rate at aL / min to ensure that liquid nitrogen is replenished to the subcooler at a flow rate of bL / min; when the liquid nitrogen level in the shell side of the subcooler reaches xm 3 When the outlet temperature of the subcooler reaches the required subcooling temperature, the liquid nitrogen level and flow rate are stabilized. That is, the liquid methane storage tank is pressurized by the self-pressurizing device to the liquid methane storage tank, and the pressure is increased to the maximum flow working pressure. The liquid methane is transported to the liquid methane discharge device through the subcooler; the liquid methane flow rate is adjusted to be stable at aL / min by the filling pipeline regulating valve 11, and the subcooler liquid nitrogen regulating valve 25 is automatically controlled to ensure that the liquid nitrogen is replenished to the subcooler at a flow rate of b L / min; when the liquid nitrogen level in the shell side (inside the shell) of the subcooler reaches xm 3 When the outlet temperature of the subcooler reaches the required subcooling temperature, the liquid nitrogen level and flow rate are stabilized. Where a, b and x represent numerical values, which are stable values ​​obtained through a large amount of experimental data and simulation.

[0074] Precooling the liquid methane tank on the arrow specifically includes: controlling a small flow of supercooled liquid methane to enter the liquid methane tank on the arrow, automatically adjusting the filling pipe regulating valve to ensure that the filling pipeline flow is stable at a L / min, and then a part of a1 L / min of supercooled liquid methane enters the liquid methane tank on the arrow, and a2 L / min of liquid methane enters the liquid methane discharge device through the second filling branch, satisfying a=a1+a2, and when the liquid methane tank on the arrow reaches the precooling liquid level, the precooling of the liquid methane tank on the arrow is completed. Specifically, control a small flow of supercooled (liquid methane that meets the standards) liquid methane to enter the liquid methane tank 4 on the arrow. Open the end valve 13, automatically adjust the filling pipe regulating valve 11 to ensure that the filling pipeline flow is stable at a L / min, and at the same time a1 L / min of supercooled liquid methane enters the liquid methane tank 4 on the arrow, and a2 L / min of liquid methane enters the liquid methane discharge device (where a=a1+a2). When the arrow-mounted liquid methane storage tank 4 reaches the precooling liquid level, the precooling of the arrow-mounted liquid methane storage tank 4 is completed.

[0075] The large-flow supercooling filling of the on-arrow liquid methane tank specifically includes: closing the second filling branch entering the liquid methane discharge device to achieve a large flow into the on-arrow liquid methane tank; when the liquid level of the on-arrow liquid methane tank reaches the final value level, closing the first filling branch entering the on-arrow liquid methane tank, and opening the second filling branch entering the liquid methane discharge device. In this process, the discharge pipeline regulating valve is automatically controlled to simulate the rocket back pressure and flow resistance, and the automatic control flow is stabilized at a L / (the discharge pipeline regulating valve is automatically controlled to simulate the rocket back pressure and flow resistance, ensuring that the liquid methane flow through the second filling branch after the filling of the on-arrow liquid methane tank is consistent with the flow into the on-arrow liquid methane tank, avoiding the switching of the first filling branch and the second filling branch, and the flow in the second filling branch has a large fluctuation), completing the large-flow supercooling filling of the on-arrow liquid methane tank. That is, a large flow of supercooled liquid methane is controlled to enter the liquid methane tank 4 on the arrow, the discharge line stop valve (set on the discharge line 3 between the discharge line regulating valve 5 and the flow meter 6) is closed, and the end-addition valve 13 is maintained open; the filling pipe regulating valve 11 is controlled to stabilize the flow of the pipeline at a L / min, so as to achieve a large flow entering the liquid methane tank 4 on the arrow; when the liquid level of the liquid methane tank 4 on the arrow reaches the final value level, the end-addition valve is closed and the discharge line stop valve is opened; the discharge line regulating valve 5 is automatically controlled to simulate the rocket back pressure and flow resistance, and the flow is automatically controlled to be stable at a L / min, so as to complete the large flow supercooled filling of the liquid methane tank 4 on the arrow.

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

[0077] The above description is only an illustrative specific implementation manner of the present invention. Without departing from the concept and principle of the present invention, any equivalent changes and modifications made by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. An online liquid methane full subcooling filling system, characterized in that: It comprises a liquid methane storage device, a boosting pipeline, a liquid methane supercooling 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 boosting pipeline, the output end of the boosting pipeline is connected to the input end of the filling pipeline, the filling pipeline is respectively connected to a first filling branch and a second filling branch after passing through the liquid methane supercooling filling device, wherein the first filling branch is used to be connected to the arrow-mounted liquid methane storage tank, 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, and a discharge pipeline regulating valve for adjusting the liquid methane flow rate and a flow meter for monitoring the liquid methane flow rate are arranged on the discharge pipeline; The liquid methane storage device is used to store liquid methane and transport liquid methane to the arrow-mounted liquid methane storage tank and the liquid methane discharge device through the liquid methane supercooling filling device; the liquid methane supercooling filling device is used to supercool the transported liquid methane; the liquid methane discharge device is used to collect and discharge liquid methane.

2. The online liquid methane full subcooling filling system according to claim 1 is characterized in that: The liquid methane storage device at least includes a self-pressurizing device and a liquid methane storage tank in the storage area. The self-pressurizing device is used to adjust the internal pressure of the liquid methane storage tank in the storage area. Both ends of the pipeline of the self-pressurizing device are respectively connected to the liquid methane storage tank in the storage area, and the pipeline is sequentially provided with a liquid methane boosting stop valve, a liquid methane boosting regulating valve, and a liquid methane self-pressurizing vaporizer from upstream to downstream.

3. The online liquid methane full subcooling filling system according to claim 1 is characterized in that: A liquid methane filling flowmeter and a liquid methane inlet valve are arranged on the front section filling pipeline between the boosting pipeline and the liquid methane supercooling filling device; the filling pipeline includes a rear section filling pipeline downstream of the liquid methane supercooling filling device, one end of the rear section filling pipeline is connected to the front section filling pipeline, and the other end 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 liquid methane after supercooling and a filling pipeline regulating valve for adjusting the liquid methane flow rate.

4. The online liquid methane full subcooling filling system according to claim 2 is characterized in that: The first filling branch is also provided with a second temperature measuring instrument for measuring the temperature of liquid methane inside the first filling branch and an end-filling valve for opening / closing the first filling branch; along the direction from upstream to downstream of the discharge pipeline, the discharge pipeline is sequentially provided with the flow meter and the discharge pipeline regulating valve, and a discharge pipeline stop valve is also provided on the discharge pipeline between the discharge pipeline regulating valve and the flow meter.

5. The online liquid methane full subcooling filling system according to claim 2 is characterized in that: The liquid methane supercooling filling device is a supercooler, and the liquid methane supercooling filling device also includes 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 supercooler, the output end of the supercooler 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 transports liquid nitrogen to the supercooler; the supercooler is used to exchange heat with liquid methane through liquid nitrogen to adjust the temperature of liquid methane passing through the supercooler; along the upstream to downstream direction of the liquid nitrogen input pipeline, a subcooler liquid nitrogen flowmeter for detecting the liquid nitrogen flow rate and a subcooler liquid nitrogen regulating valve for adjusting the liquid nitrogen flow rate are sequentially arranged on the liquid nitrogen input pipeline.

6. An online liquid methane full subcooling filling process, characterized in that: A liquid methane storage device, a pressurizing pipeline, a liquid methane supercooling filling device, a filling pipeline, a liquid methane discharge device and a discharge pipeline are provided, wherein the output end of the liquid methane storage device is connected to the input end of the pressurizing pipeline, the output end of the pressurizing pipeline is connected to the input end of the filling pipeline, and the filling pipeline is respectively connected to a first filling branch and a second filling branch after passing through the liquid methane supercooling filling device, wherein the first filling branch is used to be connected to the arrow liquid methane storage tank, the second filling branch is used to be connected to the input end of the discharge pipeline, and the output end of the discharge pipeline is connected to the liquid methane discharge device, S1, precooling the filling pipeline: precooling the filling pipeline connected to the liquid methane discharge device and the second filling branch for the first time by using a small flow of liquid methane, and inputting liquid nitrogen into the liquid methane supercooling filling device; S2, online preparation of liquid methane supercooled liquid: precooling the filling pipeline connected to the liquid methane discharge device and the second filling branch for the second time by using large-flow liquid methane, and adjusting the liquid nitrogen flow in the liquid methane supercooling filling device to match the flow of large-flow liquid methane to ensure that the liquid methane temperature in the filling pipeline meets the design requirements; S3, precooling the arrow-mounted liquid methane storage tank: a portion of the supercooled liquid methane of the online liquid methane supercooled liquid enters the arrow-mounted liquid methane storage tank through the first filling branch, and another portion of the supercooled liquid methane enters the liquid methane discharge device through the second filling branch. When the arrow-mounted liquid methane storage tank reaches the precooling liquid level, the arrow-mounted liquid methane storage tank is precooled; S4, large-flow supercooling filling of the liquid methane tank on the arrow; closing the second filling branch entering the liquid methane discharge device, and opening the first filling branch to allow a large flow of liquid methane into the liquid methane tank on the arrow; when the liquid level of the liquid methane tank on the arrow reaches the final liquid level, closing the first filling branch entering the liquid methane tank on the arrow, and opening the second filling branch entering the liquid methane discharge device, to complete the large-flow supercooling filling of the liquid methane tank on the arrow.

7. The on-line liquid methane full subcooling filling process according to claim 6 is characterized in that: The precooling of the filling pipeline also includes detecting the temperature of the second filling branch by a temperature measuring instrument to confirm that the precooling of the filling pipeline is completed when the temperature in the filling pipeline is equal to or lower than the precooling temperature.

8. The on-line liquid methane full subcooling filling process according to claim 6 is characterized in that: The production of liquid methane subcooled liquid specifically includes: adjusting the filling pipeline regulating valve to stabilize the liquid methane flow rate at aL / min; automatically controlling the subcooler liquid nitrogen regulating valve according to the stable liquid methane flow rate at aL / min to ensure that liquid nitrogen is added to the subcooler at a flow rate of b L / min; when the liquid nitrogen level in the shell side of the subcooler reaches xm 3 , when the outlet temperature of the subcooler reaches the required subcooling temperature, stabilize the liquid nitrogen level and flow rate.

9. The on-line liquid methane full subcooling filling process according to claim 6 is characterized in that: Precooling the liquid methane tank on the arrow specifically includes: controlling a small flow of supercooled liquid methane to enter the liquid methane tank on the arrow, automatically adjusting the filling pipe regulating valve to ensure that the filling pipe flow is stable at a L / min, and then a part of a1 L / min supercooled liquid methane enters the liquid methane tank on the arrow, and a2 L / min liquid methane enters the liquid methane discharge device through the second filling branch, satisfying a=a1+a2, and the precooling of the liquid methane tank on the arrow is completed when the liquid methane tank on the arrow reaches the precooling liquid level.

10. The on-line liquid methane full subcooling filling process according to claim 6, characterized in that: The large-flow supercooled filling of the liquid methane tank on the arrow specifically includes: closing the second filling branch entering the liquid methane discharge device to achieve a large flow into the liquid methane tank on the arrow; when the liquid level of the liquid methane tank on the arrow reaches the final liquid level, closing the first filling branch entering the liquid methane tank on the arrow, and opening the second filling branch entering the liquid methane discharge device, automatically controlling the discharge pipeline regulating valve to simulate the rocket back pressure and flow resistance, and automatically controlling the flow rate to be stable at a L / min, thereby completing the large-flow supercooled filling of the liquid methane tank on the arrow.

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