System and method for filling different use gases with cryogenic liquefied gas

Abstract

The application relates to the technical field of gas filling, in particular to a system and method for filling different-purpose gases by low-temperature liquefied gas. In the technical scheme, the first storage tank, the auxiliary container, the heating device, the second storage tank and the third storage tank are arranged, the liquefied gas in the auxiliary container can be directly heated by the auxiliary heater, the pressurized transmission of the liquefied gas (i.e. the transmission of the liquid phase end of the first storage tank) is realized in the form of volume increase of the phase change liquid after being heated, and the problem of low reliability in the mechanical conveying of the deep-cooling liquefied gas is solved. Therefore, the system can realize the filling of the liquefied gas, the normal-temperature high-pressure gas and the low-temperature high-pressure gas, and can provide various different-phase-state gases and different-required filling modes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas filling, in particular to a system and method for filling different purpose gases by low-temperature liquefied gas. BACKGROUND

[0002] Many gases can be liquefied, such as air, oxygen, nitrogen, hydrogen, natural gas, etc. After liquefaction, the volume of the gas is greatly reduced, which brings benefits to the transportation and use of the gas. However, after centralized processing of the liquefied gas, the users in different places have various needs, such as the need for methane. Some users need liquid methane, and some users need gaseous methane.

[0003] Therefore, it is necessary to provide a system and method for filling different purpose gases by low-temperature liquefied gas to solve the above technical problems. SUMMARY

[0004] The present application provides a system and method for filling different purpose gases by low-temperature liquefied gas, which can provide various different phase gases and filling modes with different requirements.

[0005] In a first embodiment, the present application provides a system for filling different purpose gases by low-temperature liquefied gas, comprising a first storage tank, an auxiliary container, a heating device, a second storage tank and a third storage tank, the first storage tank is used for storing low-temperature liquefied gas, the auxiliary container is provided with an auxiliary heater, the heating device is provided with a first heater and a second heater, the first heater is connected with the second storage tank through a first booster, the second heater is connected with the third storage tank through a second booster, the second storage tank is used for storing normal-temperature high-pressure gas, and the third storage tank is used for storing low-temperature high-pressure gas.

[0006] The first storage tank and a low-temperature liquefied gas cylinder to be filled are connected through a first pipeline, the gas phase end of the first storage tank and the gas phase end of the auxiliary container are connected through a second pipeline, the liquid phase end of the first storage tank and the liquid phase end of the auxiliary container are connected through a third pipeline, the gas phase end of the first storage tank and the first heater are connected through a fourth pipeline, the liquid phase end of the first storage tank and the second heater are connected through a fifth pipeline, the first heater and the first booster are connected through a sixth pipeline, the second heater and the second booster are connected through a seventh pipeline, the first booster and the second storage tank are connected through an eighth pipeline, the second booster and the third storage tank are connected through a ninth pipeline, the second storage tank and a normal-temperature high-pressure gas cylinder to be filled are connected through a tenth pipeline, and the third storage tank and a low-temperature high-pressure gas cylinder to be filled are connected through an eleventh pipeline.

[0007] Preferably, the first heater and the second heater are both tubular heaters.

[0008] Preferably, the heating device is provided with flowing solid particles delivered by a delivery gas with a temperature higher than zero, which are used to heat the first heater and the second heater.

[0009] Preferably, the solid particles include aluminum metal particles.

[0010] Preferably, the first storage tank and the auxiliary container are both provided with temperature and pressure detection devices.

[0011] Preferably, the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline, the eighth pipeline, the ninth pipeline, the tenth pipeline and the eleventh pipeline are all provided with check valves and controlled on-off valves.

[0012] Preferably, the auxiliary heater is an electric heater.

[0013] Preferably, the application further comprises a control device, and the temperature and pressure detection devices, the auxiliary heater and each of the controlled on-off valves are electrically connected to the control device through control lines.

[0014] In the second embodiment, the application provides a method for filling different-purpose gases with low-temperature liquefied gas, which is applied to the system for filling different-purpose gases with low-temperature liquefied gas as described above, and comprises the following steps:

[0015] Step S1: opening the controlled on-off valve of the third pipeline by using the control device, so that part of the liquefied gas in the first storage tank flows into the auxiliary container until the allowable volume of the auxiliary container is reached, and then closing the controlled on-off valve of the third pipeline by using the control device;

[0016] Step S2: opening the auxiliary heater by using the control device to heat the liquefied gas in the auxiliary container, and then closing the auxiliary heater by using the control device when the medium temperature in the auxiliary container reaches a preset temperature or the medium pressure in the auxiliary container reaches a first preset pressure;

[0017] Step S3: opening the controlled on-off valve of the second pipeline by using the control device to make the medium in the auxiliary container flow into the first storage tank when the gas-phase pressure in the first storage tank is insufficient, and then closing the controlled on-off valve of the second pipeline by using the control device when the gas-phase pressure in the first storage tank reaches a second preset pressure;

[0018] Step S4, opening the controlled on-off valves of the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline by the control device, so that the gas-phase medium of the first storage tank enters the second storage tank for storage after being heated by the first heater and pressurized by the first booster in turn, and the liquid-phase medium of the first storage tank enters the third storage tank for storage after being heated by the second heater and pressurized by the second booster in turn;

[0019] Step S5, opening the controlled on-off valve of the first pipeline by the control device to supply liquefied gas to the low-temperature liquefied gas cylinder to be filled; opening the controlled on-off valve of the tenth pipeline by the control device to supply normal-temperature high-pressure gas to the normal-temperature high-pressure gas cylinder to be filled; and opening the controlled on-off valve of the eleventh pipeline by the control device to supply low-temperature high-pressure gas to the low-temperature high-pressure gas cylinder to be filled.

[0020] Beneficial effects:

[0021] The system and method for filling different-purpose gas by low-temperature liquefied gas provided by the application can directly heat the liquefied gas in the auxiliary container by the auxiliary heater, so as to realize the pressurized transmission of the liquefied gas by the way of volume increase of the liquid-phase phase-change body after being heated (i.e. the transmission of the liquid-phase end of the first storage tank), thereby solving the problem of low reliability in the low-temperature mechanical transmission of the deep-cooling liquefied gas. In this way, the system can realize the filling of the liquefied gas, the normal-temperature high-pressure gas and the low-temperature high-pressure gas, and thus can provide multiple different-phase-state gases and different-purpose filling modes. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0023] Figure 1 The structure schematic diagram of the system for filling different-purpose gas by low-temperature liquefied gas provided by the embodiments of the application.

[0024] Reference signs:

[0025] 100 - low-temperature liquefied gas cylinder; 200 - normal-temperature high-pressure gas cylinder; 300 - low-temperature high-pressure gas cylinder;

[0026] 1-First storage tank; 11-Temperature and pressure detection device; 10-Controlled on / off valve; 20-Check valve; 2-Auxiliary container; 21-Auxiliary heater; 3-Heating device; 31-First heater; 32-Second heater; 41-Second storage tank; 42-Third storage tank; 51-First booster; 52-Second booster; 6-Control device;

[0027] p1 - ​​First pipe; p2 - Second pipe; p3 - Third pipe; p4 ​​- Fourth pipe; p5 - Fifth pipe; p6 - Sixth pipe; p7 - Seventh pipe; p8 - Eighth pipe; p9 - Ninth pipe; p10 - Tenth pipe; p11 - Eleventh pipe. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0032] For gaseous gases, users sometimes need to control the gas temperature. For example, hydrogen is very sensitive to high temperatures because the composite material hydrogen storage cylinders on vehicles are very sensitive to high temperatures. Hydrogen will generate a large temperature rise during the compression and refilling process. In order to ensure the safety of the cylinder, relevant standards and regulations stipulate that the maximum temperature during the refilling process shall not exceed 85°C. Therefore, the temperature of the gas to be refilled should be at a lower temperature.

[0033] The low-pressure and low-temperature stored liquefied gas, such as becomes high-pressure gas, has multiple ways, such as using a cryogenic pump to pressurize, pressurizing the low-temperature liquefied gas, and then gasifying, the gasified gas has a self-pressure, and there is another way to guide the liquefied gas into a sealed space, heat, and use the volume change of the liquefied gas itself to achieve a higher pressure. The technical approach of heating in the sealed space does not use a pump and does not have the equipment maintenance problem brought by the deep cold dynamic equipment, and has higher reliability.

[0034] To solve the above technical problems, please refer to Figure 1 An embodiment of the present application provides a system for filling different use gases by low-temperature liquefied gas, which comprises a first storage tank 1, an auxiliary container 2, a heating device 3, a second storage tank 41 and a third storage tank 42, the first storage tank 1 is used for storing low-temperature liquefied gas, the auxiliary container 2 is provided with an auxiliary heater 21, the heating device 3 is provided with a first heater 31 and a second heater 32, the first heater 31 and the second storage tank 41 are connected by a first pressure booster 51, the second heater 32 and the third storage tank 42 are connected by a second pressure booster 52, the second storage tank 41 is used for storing normal-temperature high-pressure gas, and the third storage tank 42 is used for storing low-temperature high-pressure gas.

[0035] The first storage tank 1 and the low-temperature liquefied gas bottle 100 to be filled are connected by a first pipeline p1, the gas phase end of the first storage tank 1 and the gas phase end of the auxiliary container 2 are connected by a second pipeline p2, the liquid phase end of the first storage tank 1 and the liquid phase end of the auxiliary container 2 are connected by a third pipeline p3, the gas phase end of the first storage tank 1 and the first heater 31 are connected by a fourth pipeline p4, the liquid phase end of the first storage tank 1 and the second heater 32 are connected by a fifth pipeline p5, the first heater 31 and the first pressure booster 51 are connected by a sixth pipeline p6, the second heater 32 and the second pressure booster 52 are connected by a seventh pipeline p7, the first pressure booster 51 and the second storage tank 41 are connected by an eighth pipeline p8, the second pressure booster 52 and the third storage tank 42 are connected by a ninth pipeline p9, the second storage tank 41 and the normal-temperature high-pressure gas bottle 200 to be filled are connected by a tenth pipeline p10, and the third storage tank 42 and the low-temperature high-pressure gas bottle 300 to be filled are connected by an eleventh pipeline p11.

[0036] In the embodiment, by arranging the first storage tank 1, the auxiliary container 2, the heating device 3, the second storage tank 41 and the third storage tank 42, the auxiliary heater 21 can be used to directly heat the liquefied gas in the auxiliary container 2, so as to realize the pressurized transmission of the liquefied gas in the form of volume increase of the phase change body after being heated (i.e. the transmission of the liquid phase end of the first storage tank 1), thereby solving the problem of low reliability in the low-temperature mechanical transmission of the deep cold liquefied gas. In this way, the above system can realize the filling of the liquefied gas, the normal-temperature high-pressure gas and the low-temperature high-pressure gas, and thus can provide multiple different phase state gases and different required filling modes.

[0037] It can be understood that the auxiliary heater 21 heats and vaporizes the liquefied gas in the auxiliary container 2, and the medium can be heated and pressurized, and the pressure increase can realize the pressurized transmission of the liquefied gas, that is, the gas pressure delivery replaces the traditional low-temperature mechanical delivery of the cryogenic liquefied gas.

[0038] It can be further understood that the liquefied gas from the first storage tank 1 and the medium (mainly gas) from the auxiliary container 2 are heated simultaneously in the heating device 3, so that the liquefied gas from the first storage tank 1 is vaporized into low-temperature high-pressure gas of a certain pressure in the second heater 32, and is pressurized by the second pressure booster 52 into low-temperature high-pressure gas suitable for filling, and the medium from the auxiliary container 2 continues to increase the temperature and pressure of the medium in the first heater 31, and is pressurized by the first pressure booster 51 into high-pressure gas at normal temperature suitable for filling.

[0039] Further, the first heater 31 and the second heater 32 are both tubular heaters, which are not specifically limited here.

[0040] The cryogenic liquefied gas is often frozen in the process of heating and vaporization, resulting in a larger heat exchange area and lower efficiency of the heat exchanger, because the temperature of the cryogenic liquefied gas is low. For example, the temperature of liquid hydrogen is -253°C, and the temperature of liquid nitrogen is -196°C, which has a heat transfer temperature difference of more than 200 degrees from the normal temperature. The ordinary heating fluid is frozen in the process of heating and vaporization of the cryogenic liquefied gas, resulting in a larger heat exchange area and lower efficiency of the heat exchanger.

[0041] In order to solve the above technical problems, further, the heating device 3 is provided with flowing solid particles delivered by the delivery gas with a temperature higher than zero, and the solid particles are used to heat the first heater 31 and the second heater 32.

[0042] In this embodiment, the flowing solid particles in the heating device 3 are used to simultaneously heat the low-temperature gas and the low-temperature liquefied gas, which can solve the problem of frost formation outside the heat exchange tube.

[0043] Further, the solid particles include aluminum metal particles, which are not specifically limited here. The aluminum metal particles can ensure high mechanical strength and good heat conductivity at low temperature, and are suitable for rapid heat transfer.

[0044] Further, the first storage tank 1 and the auxiliary container 2 are both provided with temperature and pressure detection devices 11.

[0045] Further, the first pipeline p1, the second pipeline p2, the third pipeline p3, the fourth pipeline p4, the fifth pipeline p5, the sixth pipeline p6, the seventh pipeline p7, the eighth pipeline p8, the ninth pipeline p9, the tenth pipeline p10 and the eleventh pipeline p11 are provided with non-return valves 20 and controlled on-off valves 10. In this way, the controlled on-off valves 10 are controlled to be opened and closed according to pressure signals by the control device 6, and the non-return valves 20 ensure that high-pressure fluid cannot flow into low-pressure end devices.

[0046] Further, the auxiliary heater 21 is an electric heater, which is not specifically limited herein.

[0047] Further, the control device 6, the temperature and pressure detection device 11, the auxiliary heater 21 and each controlled on-off valve 10 are electrically connected to the control device 6 through control lines.

[0048] In addition, the embodiment of the present application further provides a method for filling low-temperature liquefied gas into gas for different purposes, which is applied to the system mentioned above and comprises the following steps:

[0049] Step S1, the controlled on-off valve 10 of the third pipeline p3 is opened by the control device 6, so that part of the liquefied gas in the first storage tank 1 flows into the auxiliary container 2 until the allowable volume of the auxiliary container 2 is reached, and then the controlled on-off valve 10 of the third pipeline p3 is closed by the control device 6.

[0050] Step S2, the auxiliary heater 21 is turned on by the control device 6 to heat the liquefied gas in the auxiliary container 2, and when the temperature of the medium in the auxiliary container 2 reaches a preset temperature or the pressure of the medium in the auxiliary container 2 reaches a first preset pressure, the auxiliary heater 21 is turned off by the control device 6.

[0051] Step S3, when the gas-phase pressure in the first storage tank 1 is insufficient, the controlled on-off valve 10 of the second pipeline p2 is opened by the control device 6, so that the medium in the auxiliary container 2 flows into the first storage tank 1, and when the gas-phase pressure in the first storage tank 1 reaches a second preset pressure, the controlled on-off valve 10 of the second pipeline p2 is closed by the control device 6.

[0052] Step S4, the controlled on-off valves 10 of the fourth pipeline p4, the fifth pipeline p5, the sixth pipeline p6 and the seventh pipeline p7 are opened by the control device 6, so that the gas-phase medium in the first storage tank 1 is sequentially heated by the first heater 31 and pressurized by the first pressure booster 51, and then enters the second storage tank 41 for storage, and the liquid-phase medium in the first storage tank 1 is sequentially heated by the second heater 32 and pressurized by the second pressure booster 52, and then enters the third storage tank 42 for storage.

[0053] Step S5, the controlled switch valve 10 of the first pipeline p1 is opened by the control device 6 to supply liquefied gas to the low-temperature liquefied gas cylinder 100 to be filled; the controlled switch valve 10 of the tenth pipeline p10 is opened by the control device 6 to supply normal-temperature high-pressure gas to the normal-temperature high-pressure gas cylinder 200 to be filled; and the controlled switch valve 10 of the eleventh pipeline p11 is opened by the control device 6 to supply low-temperature high-pressure gas to the low-temperature high-pressure gas cylinder 300 to be filled.

[0054] The liquefied gas from the first storage tank 1 is heated, vaporized, warmed and pressurized in the auxiliary container 2 by the auxiliary heater 21. Such repetition realizes the filling of low-temperature liquefied gas for different purposes.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of the present application, which is only used to illustrate the technical solutions of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A system for filling gases for different purposes with cryogenic liquefied gas, characterized in that, The system includes a first storage tank, an auxiliary container, a heating device, a second storage tank, and a third storage tank. The first storage tank is used to store cryogenic liquefied gas. The auxiliary container is equipped with an auxiliary heater. The heating device is equipped with a first heater and a second heater. A first booster is connected between the first heater and the second storage tank. A second booster is connected between the second heater and the third storage tank. The second storage tank is used to store ambient temperature high-pressure gas, and the third storage tank is used to store cryogenic high-pressure gas. The first storage tank and the cryogenic liquefied gas cylinder to be filled are connected by a first pipeline. The gas phase end of the first storage tank and the gas phase end of the auxiliary container are connected by a second pipeline. The liquid phase end of the first storage tank and the liquid phase end of the auxiliary container are connected by a third pipeline. The gas phase end of the first storage tank and the first heater are connected by a fourth pipeline. The liquid phase end of the first storage tank and the second heater are connected by a fifth pipeline. The first heater and the first booster are connected by a sixth pipeline. The second heater and the second booster are connected by a seventh pipeline. The first booster and the second storage tank are connected by an eighth pipeline. The second booster and the third storage tank are connected by a ninth pipeline. The second storage tank and the ambient temperature high-pressure gas cylinder to be filled are connected by a tenth pipeline. The third storage tank and the cryogenic high-pressure gas cylinder to be filled are connected by an eleventh pipeline.

2. The system according to claim 1, characterized in that, Both the first heater and the second heater are tubular heaters.

3. The system according to claim 2, characterized in that, The heating device contains flowing solid particles transported by a conveying gas at a temperature above zero degrees Celsius. These solid particles are used to heat the first heater and the second heater.

4. The system according to claim 3, characterized in that, The solid particles include aluminum metal particles.

5. The system according to any one of claims 1-4, characterized in that, Both the first storage tank and the auxiliary container are equipped with temperature and pressure detection devices.

6. The system according to claim 5, characterized in that, Check valves and controlled switching valves are provided on the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline, the eighth pipeline, the ninth pipeline, the tenth pipeline, and the eleventh pipeline.

7. The system according to claim 6, characterized in that, The auxiliary heater is an electric heater.

8. The system according to claim 7, characterized in that, It also includes a control device, wherein the temperature and pressure detection device, the auxiliary heater, and each of the controlled switching valves are electrically connected to the control device via control lines.

9. A method for filling gases for different purposes with cryogenic liquefied gas, characterized in that, Applied to the system as described in claim 8, comprising: Step S1: Use the control device to open the controlled switch valve of the third pipeline, so that part of the liquefied gas in the first storage tank flows into the auxiliary container until the allowable volume of the auxiliary container is reached, and use the control device to close the controlled switch valve of the third pipeline. Step S2: Use the control device to turn on the auxiliary heater to heat the liquefied gas in the auxiliary container. When the temperature of the medium in the auxiliary container reaches a preset temperature or the pressure of the medium in the auxiliary container reaches a first preset pressure, use the control device to turn off the auxiliary heater. Step S3: When the gas phase pressure in the first storage tank is insufficient, the controlled switch valve of the second pipeline is opened using the control device to allow the medium in the auxiliary container to flow to the first storage tank. When the gas phase pressure in the first storage tank reaches the second preset pressure, the controlled switch valve of the second pipeline is closed using the control device. Step S4: Use the control device to open the controlled switching valves of the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline, so that the gaseous medium in the first storage tank enters the second storage tank for storage after being heated by the first heater and pressurized by the first booster in sequence, and so that the liquid medium in the first storage tank enters the third storage tank for storage after being heated by the second heater and pressurized by the second booster in sequence. Step S5: Use the control device to open the controlled switch valve of the first pipeline to supply liquefied gas to the cryogenic liquefied gas cylinder to be filled; use the control device to open the controlled switch valve of the tenth pipeline to supply room temperature high pressure gas to the room temperature high pressure gas cylinder to be filled; use the control device to open the controlled switch valve of the eleventh pipeline to supply cryogenic high pressure gas to the cryogenic high pressure gas cylinder to be filled.

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