System and method for filling low-temperature liquefied gas with gases for different purposes

Abstract

The invention relates to the technical field of gas filling, in particular to a system and method for filling gases with different purposes from low-temperature liquefied gas. According to the technical scheme, through the arrangement of the first storage tank, the auxiliary container, the heating device, the second storage tank and the third storage tank, the liquefied gas in the auxiliary container can be directly heated through the auxiliary heater, and pressurized conveying (namely conveying of the liquid phase end of the first storage tank) of the liquefied gas is achieved in the mode that the phase change volume of the heated liquid is increased; the problem that the reliability is low when cryogenic liquefied gas is mechanically conveyed at a low temperature is solved. In this way, the system can achieve filling of liquefied gas, normal-temperature high-pressure gas and low-temperature high-pressure gas, and therefore various filling modes with different phase-state gas and different requirements can be provided.

Description

Technical Field

[0001] The present invention relates to the technical field of gas filling, and in particular to a system and method for filling gases of different uses with cryogenic liquefied gas. Background Art

[0002] A variety of gases can be liquefied, such as air, oxygen, nitrogen, hydrogen, and natural gas. After liquefaction, the volume of the gas is greatly reduced, which benefits its transportation and use. Centrally processed liquefied gases, after being transported to dispersed locations, face various user needs, such as methane, which is required in both liquid and gaseous forms.

[0003] Therefore, it is necessary to provide a system and method for filling gases of different uses with cryogenic liquefied gas to solve the above technical problems. Summary of the Invention

[0004] The present invention provides a system and method for filling gases of different uses with cryogenic liquefied gas, which can provide a variety of filling methods for gases of different phases and different requirements.

[0005] In a first embodiment, the present invention provides a system for filling different-purpose gases with cryogenic 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 to store cryogenic liquefied gas, the auxiliary container is provided with an auxiliary heater, the heating device is provided with a first heater and a second heater, a first booster is connected between the first heater and the second storage tank, and a second booster is connected between the second heater and the third storage tank. The second storage tank is used to store room-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 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 the normal temperature and high pressure gas cylinder to be filled are connected through a tenth pipeline, and the third storage tank and the cryogenic and high pressure gas cylinder to be filled are connected through an eleventh pipeline.

[0006] Preferably, both the first heater and the second heater are tubular heaters.

[0007] Preferably, the heating device is provided with flowing solid particles transported by a transport gas with a temperature higher than zero degrees, and the solid particles are used to heat the first heater and the second heater.

[0008] Preferably, the solid particles include aluminum metal particles.

[0009] Preferably, the gas includes air, oxygen, nitrogen, hydrogen and natural gas.

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

[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 a check valve and a controlled switching valve.

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

[0013] Preferably, a control device is further included, and the temperature and pressure detection device, the auxiliary heater and each of the controlled switch valves are electrically connected to the control device through a control line.

[0014] In a second embodiment, the present invention provides a method for filling gases of different uses with cryogenic liquefied gas, which is applied to the above-mentioned system for filling gases of different uses with cryogenic liquefied gas, comprising: Step S1: using the control device to open the controlled on-off 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 then using the control device to close the controlled on-off valve of the third pipeline; Step S2: using 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, using the control device to turn off the auxiliary heater; Step S3: When the gas phase pressure in the first storage tank is insufficient, the control device is used to open the controlled on-off valve of the second pipeline 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 a second preset pressure, the control device is used to close the controlled on-off valve of the second pipeline; Step S4: using the control device to open the controlled on-off 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 is sequentially heated by the first heater and pressurized by the first supercharger and then enters the second storage tank for storage; and the liquid-phase medium in the first storage tank is sequentially heated by the second heater and pressurized by the second supercharger and then enters the third storage tank for storage; Step S5: Use the control device to open the controlled on-off valve of the first pipeline to supply liquefied gas to the low-temperature liquefied gas cylinder to be filled; use the control device to open the controlled on-off valve of the tenth pipeline to supply normal temperature and high pressure gas to the normal temperature and high pressure gas cylinder to be filled; use the control device to open the controlled on-off valve of the eleventh pipeline to supply low temperature and high pressure gas to the low temperature and high pressure gas cylinder to be filled.

[0015] Beneficial effects: The system and method provided by the present invention for filling different types of gases with cryogenic liquefied gas utilizes a first storage tank, an auxiliary container, a heating device, a second storage tank, and a third storage tank. The auxiliary heater directly heats the liquefied gas in the auxiliary container, enabling pressurized transmission of the liquefied gas (i.e., transmission from the liquid end of the first storage tank) through a phase change and volume increase of the heated liquid. This addresses the issue of low reliability associated with cryogenic mechanical transport of deep-chilled liquefied gas. The system can thus accommodate the filling of liquefied gas, ambient temperature high-pressure gas, and cryogenic high-pressure gas, providing a variety of filling methods for gases in different phases and with varying requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a system for filling gases of different uses with cryogenic liquefied gas provided in an embodiment of the present invention.

[0018] Reference numerals: 100-cryogenic liquefied gas cylinder; 200-normal temperature high pressure gas cylinder; 300-cryogenic high pressure gas cylinder; 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 supercharger; 52-second supercharger; 6-control device; p1-first pipeline; p2-second pipeline; p3-third pipeline; p4-fourth pipeline; p5-fifth pipeline; p6-sixth pipeline; p7-seventh pipeline; p8-eighth pipeline; p9-ninth pipeline; p10-tenth pipeline; p11-eleventh pipeline. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0022] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the system or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] For gaseous gases, users sometimes also need to control the gas temperature. For example, hydrogen will produce a large temperature rise during the compression and filling process because the on-board composite hydrogen storage cylinders are very sensitive to high temperatures. To ensure the safety of the cylinders, relevant specifications and standards stipulate that the maximum temperature during the filling process shall not exceed 85°C. Therefore, the temperature of the gas to be prepared for filling should be at a lower temperature.

[0024] There are several ways to convert liquefied gas stored at low pressure and low temperature into high-pressure gas. One approach involves using a cryogenic pump to pressurize the low-temperature liquefied gas, which then vaporizes and carries its own pressure. Another approach involves introducing the liquefied gas into a confined space, heating it, and using its own volume change to reach a higher pressure. This confined heating technique eliminates the need for pumps and the maintenance issues associated with cryogenic equipment, resulting in higher reliability.

[0025] To solve the above technical problems, please refer to Figure 1 One embodiment of the present invention provides a system for filling gases of different uses with cryogenic liquefied gas, the system comprising 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 to store cryogenic 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, a first booster 51 is connected between the first heater 31 and the second storage tank 41, and a second booster 52 is connected between the second heater 32 and the third storage tank 42. The second storage tank 41 is used to store room temperature high-pressure gas, and the third storage tank 42 is used to store cryogenic high-pressure gas. The first storage tank 1 is connected to the cryogenic liquefied gas cylinder 100 to be filled through a first pipeline p1, the gas phase end of the first storage tank 1 is connected to the gas phase end of the auxiliary container 2 through a second pipeline p2, the liquid phase end of the first storage tank 1 is connected to the liquid phase end of the auxiliary container 2 through a third pipeline p3, the gas phase end of the first storage tank 1 is connected to the first heater 31 through a fourth pipeline p4, the liquid phase end of the first storage tank 1 is connected to the second heater 32 through a fifth pipeline p5, the first heater 31 is connected to the first booster 51 through a sixth pipeline p6, the second heater 32 is connected to the second booster 52 through a seventh pipeline p7, the first booster 51 is connected to the second storage tank 41 through an eighth pipeline p8, the second booster 52 is connected to the third storage tank 42 through a ninth pipeline p9, the second storage tank 41 is connected to the normal temperature and high pressure gas cylinder 200 to be filled through a tenth pipeline p10, and the third storage tank 42 is connected to the cryogenic and high pressure gas cylinder 300 to be filled through an eleventh pipeline p11.

[0026] In this embodiment, by providing a first storage tank 1, auxiliary container 2, heating device 3, second storage tank 41, and third storage tank 42, the auxiliary heater 21 can be used to directly heat the liquefied gas in the auxiliary container 2. This allows for pressurized transmission of the liquefied gas (i.e., transmission from the liquid end of the first storage tank 1) through a phase change and volume increase of the heated liquid. This resolves the issue of low reliability associated with cryogenic mechanical transport of cryogenic liquefied gas. The system can thus accommodate the filling of liquefied gas, ambient temperature high-pressure gas, and cryogenic high-pressure gas, thus providing a variety of filling methods for gases in different phases and with varying requirements.

[0027] It can be understood that the auxiliary heater 21 heats and vaporizes the liquefied gas in the auxiliary container 2, which can achieve heating and pressurization of the medium, wherein the increase in pressure can achieve pressurized transmission of the liquefied gas, that is, the use of pneumatic transportation replaces the traditional low-temperature mechanical transportation of deep-cold liquefied gas.

[0028] 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 a low-temperature, high-pressure gas of a certain pressure in the second heater 32, and is pressurized by the second booster 52 to become a low-temperature, high-pressure gas suitable for filling, and the temperature and pressure of the medium from the auxiliary container 2 continue to increase in the first heater 31, and is pressurized by the first booster 51 to become a normal-temperature, high-pressure gas suitable for filling.

[0029] Furthermore, the first heater 31 and the second heater 32 are both tubular heaters, which are not specifically limited here.

[0030] Deep-cold cryogenic liquefied gases, due to their low temperature, often cause ordinary heating fluids to freeze during their heating and vaporization process, resulting in the heat exchanger requiring more heat exchange area and reducing the heat exchanger efficiency. 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 nearly 200 degrees from room temperature. They can be heated by room temperature air, but the moisture in the air will condense on the heat exchange tubes when heating the cryogenic liquefied gas, greatly reducing the efficiency of the heat exchanger.

[0031] In order to solve the above technical problems, further, flowing solid particles transported by a transport gas with a temperature above zero degrees are provided in the heating device 3 , and the solid particles are used to heat the first heater 31 and the second heater 32 .

[0032] In this embodiment, the solid particles flowing in the heating device 3 are used to heat the low-temperature gas and the low-temperature liquefied gas simultaneously, thereby solving the problem of frost on the outside of the heat exchange tubes.

[0033] Furthermore, the solid particles include aluminum metal particles, which are not specifically limited herein. Aluminum metal particles are selected to ensure high mechanical strength at low temperatures, good thermal conductivity, and are suitable for rapid heat transfer.

[0034] Furthermore, the gas includes air, oxygen, nitrogen, hydrogen and natural gas, which are not specifically limited here.

[0035] Furthermore, a temperature and pressure detection device 11 is provided in both the first storage tank 1 and the auxiliary container 2 .

[0036] Furthermore, each of 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 is provided with a check valve 20 and a controlled on-off valve 10. Thus, the controlled on-off valve 10 is opened and closed by the control device 6 according to the pressure signal, and the check valve 20 prevents the high-pressure fluid from flowing into the low-pressure end device.

[0037] Furthermore, the auxiliary heater 21 is an electric heater, which is not specifically limited here.

[0038] Furthermore, a control device 6 is included, and the temperature and pressure detection device 11, the auxiliary heater 21 and each controlled switch valve 10 are electrically connected to the control device 6 through a control line.

[0039] In addition, an embodiment of the present invention further provides a method for filling gases of different uses with cryogenic liquefied gas, which is applied to the system mentioned above, comprising: Step S1: Using the control device 6 to open the controlled on-off valve 10 of the third pipeline p3, allowing part of the liquefied gas in the first storage tank 1 to flow into the auxiliary container 2 until the allowable volume of the auxiliary container 2 is reached, and then using the control device 6 to close the controlled on-off valve 10 of the third pipeline p3; Step S2: Using the control device 6 to turn on the auxiliary heater 21 to heat the liquefied gas in the auxiliary container 2. 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, using the control device 6 to turn off the auxiliary heater 21; Step S3: When the gas phase pressure in the first storage tank 1 is insufficient, the control device 6 is used to open the controlled on-off valve 10 of the second pipeline p2 to allow the medium in the auxiliary container 2 to flow to the first storage tank 1. When the gas phase pressure in the first storage tank 1 reaches a second preset pressure, the control device 6 is used to close the controlled on-off valve 10 of the second pipeline p2. Step S4: Using the control device 6, 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, so that the gaseous medium in the first storage tank 1 is sequentially heated by the first heater 31 and pressurized by the first supercharger 51 before entering the second storage tank 41 for storage. The liquid medium in the first storage tank 1 is sequentially heated by the second heater 32 and pressurized by the second supercharger 52 before entering the third storage tank 42 for storage. Step S5: Use the control device 6 to open the controlled switch valve 10 of the first pipeline p1 to supply liquefied gas to the low-temperature liquefied gas cylinder 100 to be filled; use the control device 6 to open the controlled switch valve 10 of the tenth pipeline p10 to supply normal temperature and high pressure gas to the normal temperature and high pressure gas cylinder 200 to be filled; use the control device 6 to open the controlled switch valve 10 of the eleventh pipeline p11 to supply low temperature and high pressure gas to the low temperature and high pressure gas cylinder 300 to be filled.

[0040] The liquefied gas from the first storage tank 1 is heated and vaporized by the auxiliary heater 21 in the auxiliary container 2 and then heated and pressurized. This process is repeated to achieve the filling of low-temperature liquefied gas for different purposes.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is intended only to illustrate the technical solution of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A system for filling gases of different uses with cryogenic liquefied gas, characterized in that: The system comprises 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 provided with an auxiliary heater. The heating device is provided with a first heater and a second heater. A first supercharger is connected between the first heater and the second storage tank. A second supercharger is connected between the second heater and the third storage tank. The second storage tank is used to store normal temperature high-pressure gas. 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 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 the normal temperature and high pressure gas cylinder to be filled are connected through a tenth pipeline, and the third storage tank and the cryogenic and high pressure gas cylinder to be filled are connected through an eleventh pipeline.

2. The system according to claim 1, wherein: The first heater and the second heater are both tubular heaters.

3. The system according to claim 2, characterized in that The heating device is provided with flowing solid particles transported by a transport gas with a temperature higher than zero degrees, and the 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 claim 1, wherein: The gases include air, oxygen, nitrogen, hydrogen and natural gas.

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

7. The system according to claim 6, characterized in that 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 a check valve and a controlled switching valve.

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

9. The system according to claim 8, characterized in that It also includes a control device, and the temperature and pressure detection device, the auxiliary heater and each of the controlled switch valves are electrically connected to the control device through a control line.

10. A method for filling gases of different uses with cryogenic liquefied gas, characterized in that: The system as claimed in claim 9, comprising: Step S1: using the control device to open the controlled on-off 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 then using the control device to close the controlled on-off valve of the third pipeline; Step S2: using 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, using the control device to turn off the auxiliary heater; Step S3: When the gas phase pressure in the first storage tank is insufficient, the control device is used to open the controlled on-off valve of the second pipeline 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 a second preset pressure, the control device is used to close the controlled on-off valve of the second pipeline; Step S4: using the control device to open the controlled on-off 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 is sequentially heated by the first heater and pressurized by the first supercharger and then enters the second storage tank for storage; and the liquid-phase medium in the first storage tank is sequentially heated by the second heater and pressurized by the second supercharger and then enters the third storage tank for storage; Step S5: Use the control device to open the controlled on-off valve of the first pipeline to supply liquefied gas to the low-temperature liquefied gas cylinder to be filled; use the control device to open the controlled on-off valve of the tenth pipeline to supply normal temperature and high pressure gas to the normal temperature and high pressure gas cylinder to be filled; use the control device to open the controlled on-off valve of the eleventh pipeline to supply low temperature and high pressure gas to the low temperature and high pressure gas cylinder to be filled.

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