Gas cylinder heating method and gas cylinder heating system

Abstract

This invention discloses a gas cylinder heating method and a gas cylinder heating system. The gas cylinder heating method includes the following steps: evacuating the inner liner of the gas cylinder until the vacuum pressure of the inner liner reaches a first preset value; drawing in a first heating gas under negative pressure, thereby heating the inner liner to a first target temperature value; evacuating the interlayer of the gas cylinder until the vacuum pressure of the interlayer reaches a second preset value; drawing in a second heating gas under negative pressure, thereby heating the interlayer to a second target temperature value; and further evacuating the interlayer until the vacuum pressure of the interlayer reaches a target value. This application, by first evacuating the inner liner and the interlayer separately, and then using the negative pressure of the inner liner and the interlayer to draw in the heating gas, enables the heating gas to actively penetrate into the inner liner and the interlayer under the action of pressure difference, avoiding high-pressure gas rushing into the gas cylinder and causing damage, reducing dead zones in the flow of the heating gas, achieving sufficient heat exchange, and shortening the heating time.

Description

Technical Field

[0001] This application relates to the field of gas cylinder heating, and in particular to a gas cylinder heating method and a gas cylinder heating system. Background Technology

[0002] Currently, LNG vehicle cylinders in the industry are double-walled stainless steel containers. The inner liner of the cylinder is used to store liquefied natural gas at -162℃. To enable long-term LNG storage, the outer surface of the inner liner is wrapped with an insulating blanket. A space is created between the inner liner and the outer shell, and this space is evacuated to a vacuum level of 10°C. -1 A pressure below Pa is used to keep the gas cylinder insulated. To achieve a high vacuum in the jacket, the gas cylinder is usually heated first to make the gas molecules more active, ensuring that the gas molecules inside the jacket are more easily extracted.

[0003] Currently, most companies in the industry use external heating to heat the outer surface of the gas cylinder. However, because the gas cylinder interlayer has insulation material, it is difficult to transfer heat to the interlayer and inner liner, resulting in a long overall heating time, low vacuuming efficiency, and high gas consumption.

[0004] To improve heating efficiency, some manufacturers choose to use internal heating, which involves filling the inner liner with preheated gas. However, due to the numerous pipes and cavities inside the gas cylinder, the high-pressure gas being blown into the cylinder and the interlayer faces significant resistance, resulting in uneven heat exchange. Furthermore, due to the insulation material in the interlayer, the entire heating process still requires more than 15 hours of preheating time. In addition, the high-pressure gas blowing into the cylinder can easily damage the internal structure and insulation material, thus compromising the cylinder's structure. Summary of the Invention

[0005] To address the aforementioned problems, this application provides a gas cylinder heating method and a gas cylinder heating system.

[0006] According to one aspect of the embodiments of this application, a gas cylinder heating method is disclosed, comprising the following steps: evacuating the inner liner of the gas cylinder until the vacuum pressure of the inner liner reaches a first preset value; the inner liner draws in a first heating gas under negative pressure, thereby heating the inner liner to a first target temperature value; evacuating the interlayer of the gas cylinder until the vacuum pressure of the interlayer reaches a second preset value; the interlayer draws in a second heating gas under negative pressure, thereby heating the interlayer to a second target temperature value; and further evacuating the interlayer until the vacuum pressure of the interlayer reaches a target value, wherein the target value is lower than the second preset value.

[0007] In an exemplary embodiment, heating the inner liner to a first target temperature value includes the following steps: obtaining the current temperature value of the inner liner; determining whether the current temperature value of the inner liner has reached the first target temperature value; when the current temperature value of the inner liner has not reached the first target temperature value, repeatedly evacuating the inner liner of the gas cylinder until the vacuum pressure of the inner liner reaches a first preset value; and the inner liner drawing in a first heating gas under negative pressure.

[0008] In one exemplary embodiment, heating the inner liner to a first target temperature value further includes the following steps: obtaining the temperature of the gas extracted during vacuuming of the inner liner, and using the temperature of the gas extracted during vacuuming of the inner liner as the current temperature value of the inner liner; if the current temperature value of the inner liner has not reached the first target temperature value, continuing to vacuum the inner liner until the vacuum pressure of the inner liner reaches a first preset value; if the current temperature value of the inner liner reaches the first target temperature value, stopping the vacuuming of the inner liner.

[0009] In one exemplary embodiment, the inner liner draws in a first heating gas under negative pressure, comprising the following steps: the inner liner draws in the first heating gas under negative pressure and maintains it for a first set time; the first set time is between 10 min and 20 min.

[0010] In one exemplary embodiment, heating the interlayer to a second target temperature value includes the following steps: obtaining the current temperature value of the interlayer; determining whether the current temperature value of the interlayer has reached the second target temperature value; when the current temperature value of the interlayer has not reached the second target temperature value, repeating the process of evacuating the interlayer of the gas cylinder until the vacuum pressure of the interlayer reaches a second preset value; and the interlayer drawing in a second heating gas under negative pressure.

[0011] In one exemplary embodiment, heating the interlayer to a second target temperature value further includes the following steps: obtaining the temperature of the gas extracted during vacuuming of the interlayer, and using the temperature of the gas extracted during vacuuming of the interlayer as the current temperature value of the interlayer; if the current temperature value of the interlayer has not reached the second target temperature value, continuing to vacuum the interlayer until the vacuum pressure of the interlayer reaches a second preset value; if the current temperature value of the interlayer reaches the second target temperature value, stopping the vacuuming of the interlayer.

[0012] In one exemplary embodiment, the interlayer draws in a second heating gas under negative pressure, comprising the following steps: the interlayer draws in a second heating gas under negative pressure and maintains it for a second set time; the second set time is 10 min to 20 min.

[0013] In one exemplary embodiment, the gas cylinder heating method further includes the following steps: the gas cylinder is placed in a heating furnace, the heating furnace is equipped with a heating device, and the heating device is used to heat the interior of the heating furnace; before evacuating the inner liner of the gas cylinder, the heating device is controlled to turn on, so that the interior of the heating furnace is heated to a third target temperature value; the current temperature value inside the heating furnace is obtained, and when the obtained current temperature value of the heating furnace is lower than the third target temperature value, the heating device is controlled to turn on until the current temperature value of the heating furnace reaches the third target temperature value.

[0014] In one exemplary embodiment, the gas cylinder heating method further includes the following steps: the heating device is used to heat the gas and deliver it into the heating furnace, thereby heating the interior of the heating furnace so that the heating furnace is maintained at the third target temperature value; after the heating furnace is maintained at the third target temperature value, the gas in the heating furnace is used as the first heating gas and is drawn into the inner liner under negative pressure to heat the inner liner.

[0015] In one exemplary embodiment, the gas extracted by vacuuming the inner liner is discharged into the heating furnace; the gas extracted by vacuuming the interlayer is discharged into the heating furnace.

[0016] In one exemplary embodiment, the gas cylinder heating method further includes the following steps: the gas extracted by vacuuming the inner liner is heated to the third target temperature value and then discharged into the heating furnace; the gas extracted by vacuuming the interlayer is heated to the third target temperature value and then discharged into the heating furnace.

[0017] In one exemplary embodiment, the first preset value is 100Pa~1000Pa; the second preset value is 100Pa~1000Pa.

[0018] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0019] In the gas cylinder heating method disclosed in this application, the inner liner and the interlayer are first evacuated to create a negative pressure state inside the entire inner liner and interlayer. Then, the negative pressure of the inner liner and the interlayer is used to draw in heating gas. This allows the heating gas to actively and quickly penetrate into the inner liner and the interlayer under the action of pressure difference, and can overcome the resistance of the insulation material. This allows the heating gas to uniformly fill all areas of the entire inner liner and the interlayer, reducing dead zones in the flow of heating gas, achieving sufficient heat exchange, significantly shortening the heating time of the inner liner and the interlayer, reducing heat consumption, and finally further evacuating the interlayer to achieve the target value.

[0020] Furthermore, the heating method of this application overcomes the problem of traditional high-pressure gas failing to penetrate the gas cylinder directly, and avoids damage to the internal pipelines and insulation materials caused by high-pressure gas entering the cylinder, thus improving the safety of cylinder heating. In addition, by heating both the inner liner and the interlayer, this application ensures that both are heated to their target temperatures, reducing heat loss caused by the low-temperature inner liner absorbing heat from the interlayer, improving heating efficiency, and ensuring that the interlayer reaches the second target temperature more quickly for further vacuuming, thereby obtaining the target value.

[0021] According to another aspect of the embodiments of this application, a gas cylinder heating system is disclosed for performing the above-described gas cylinder heating method, comprising: a heating furnace having a heat-insulating space therein, the heating furnace being provided with a heating device for heating gas to a preset temperature value and conveying it into the heating furnace; a gas cylinder disposed within the heating furnace, comprising an outer shell and an inner liner disposed within the outer shell, wherein an interlayer is formed between the inner wall of the outer shell and the outer wall of the inner liner; a first gas outlet pipe having an inlet communicating with the interior of the inner liner, the first gas outlet pipe being provided with a first vacuum pump and a first switching valve, the first... A vacuum pump is used to extract gas from the inner liner; a second outlet pipe has its inlet connected to the interior of the interlayer, and the second outlet pipe is equipped with a second vacuum pump and a second switching valve, the second vacuum pump being used to extract gas from the interlayer; a first inlet pipe is connected between the interior of the heating furnace and the interior of the inner liner, used to introduce gas from the heating furnace into the inner liner, the first inlet pipe being equipped with a third switching valve; a second inlet pipe has its inlet for drawing in gas, its outlet connected to the interior of the interlayer, the second inlet pipe being equipped with a fourth switching valve.

[0022] In one exemplary embodiment, the outlet of the first vent pipe is connected to the heat-insulating space; the outlet of the second vent pipe is connected to the heat-insulating space.

[0023] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0024] The gas cylinder heating system disclosed in this application includes a heating device for heating the interior of a heating furnace and generating a first heating gas within the furnace. A first inlet pipe connects the heating furnace and the inner liner, while a second inlet pipe transports the heated second heating gas to the interlayer. During the gas cylinder heating process, the inner liner can directly draw in the first heating gas from the furnace, thereby utilizing the high-temperature gas in the furnace to rapidly raise the temperature of the inner liner. Simultaneously, the second heating gas is used to heat the interlayer, solving the problem of slow temperature rise of the inner liner due to the insulation material of the interlayer. By heating the heating furnace, the inner liner, and the interlayer separately, this application reduces heat exchange between the inside and outside of the gas cylinder, thereby reducing heat loss and improving heating efficiency. This allows the interlayer to rapidly reach the vacuum process temperature, reducing energy consumption. Furthermore, the gas in the heating furnace can be drawn into the negative-pressure inner liner, thus heating it without the need for additional gas heating equipment.

[0025] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the principles of this application.

[0027] Figure 1 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0028] Figure 2 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0029] Figure 3 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0030] Figure 4 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0031] Figure 5 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0032] Figure 6 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0033] Figure 7 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0034] Figure 8 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0035] Figure 9 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0036] Figure 10 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0037] Figure 11 This is a schematic flowchart of a gas cylinder heating method provided in an embodiment of this application.

[0038] Figure 12 This is a schematic diagram of a gas cylinder heating system provided in an embodiment of this application.

[0039] The reference numerals in the attached drawings are explained as follows: 1-Heating furnace; 11-Heating device; 12-Third temperature sensor; 2-Gas cylinder; 21-Inner liner; 22-Layer; 23-Outer shell; 3-First outlet pipe; 31-First vacuum pump; 32-First switching valve; 33-First temperature sensor; 34-First vacuum gauge; 35-First pipeline heater; 4-Second outlet pipe; 41-Second vacuum pump; 42-Second switching valve; 43-Second temperature sensor; 44-Second vacuum gauge; 5-First inlet pipe; 51-Third switching valve; 52-Filter; 6-Second inlet pipe; 61-Fourth switching valve; 62-Third pipeline heater; 7-Vacuum pump unit. Detailed Implementation

[0040] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this application will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0041] In the description of this invention, all connection relationships mentioned do not refer to direct connection of components, but rather to the ability to form a better connection structure by adding or removing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0042] In the description of this invention, unless otherwise explicitly defined, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0043] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0044] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than", "less than", "exceeding" are understood to exclude the number itself, and "above", "below", "within" are understood to include the number itself.

[0045] Reference Figure 1 and Figure 12 This application discloses a method for heating a gas cylinder, comprising the following steps:

[0046] Step S100: Vacuum the inner liner 21 of the gas cylinder 2 until the vacuum pressure of the inner liner 21 reaches the first preset value.

[0047] In this step, a partial vacuum is first drawn into the inner liner 21 to create a negative pressure state inside the inner liner 21. The first preset value can be 100Pa~1000Pa to ensure that the vacuum pressure inside the inner liner 21 is lower than atmospheric pressure, but not too low, thereby reducing the vacuuming time of the inner liner 21 and improving the overall heating efficiency.

[0048] Step S200: The inner liner 21 draws in the first heating gas under negative pressure, so that the inner liner 21 is heated to the first target temperature value.

[0049] In this step, the inner liner 21 can autonomously draw in the first heating gas under negative pressure. This first heating gas quickly penetrates the interior of the inner liner 21, allowing it to more evenly fill the liner 21 until its internal temperature reaches the first target temperature. It should be noted that the temperature of the first heating gas is higher than the initial temperature of the inner liner 21, enabling it to heat the liner 21. Furthermore, the temperature of the first heating gas is greater than or equal to the first target temperature of the inner liner 21, ensuring that its internal temperature reaches the first target temperature.

[0050] In this embodiment, the first preset value can be 100 Pa, so that the inner liner 21 can absorb enough first heating gas under negative pressure, thereby improving the effect of gas replacement of the first heating gas in the inner liner 21 and improving the heating efficiency of the inner liner 21.

[0051] Step S300: Vacuum the interlayer 22 of gas cylinder 2 until the vacuum pressure of interlayer 22 reaches the second preset value.

[0052] In this step, a partial vacuum is first evacuated from the interlayer 22 to create a negative pressure state inside the interlayer 22. The second preset value can be 100Pa~1000Pa to ensure that the vacuum pressure inside the interlayer 22 is lower than atmospheric pressure, but not too low, thereby reducing the vacuuming time of the interlayer 22 and improving the overall heating efficiency.

[0053] Step S400: The interlayer 22 draws in the second heating gas under negative pressure, so that the interlayer 22 is heated to the second target temperature value.

[0054] In this step, the interlayer 22 can autonomously draw in the second heating gas under negative pressure. The second heating gas can quickly penetrate into the interior of the interlayer 22, allowing it to be more evenly distributed within the interlayer 22 until the internal temperature of the interlayer 22 reaches the second target temperature value. It should be noted that the temperature of the second heating gas is higher than the initial temperature of the interlayer 22, enabling it to heat the interlayer 22. Furthermore, the temperature of the second heating gas is greater than or equal to the second target temperature value of the interlayer 22, ensuring that the internal temperature of the interlayer 22 reaches the second target temperature value.

[0055] In some embodiments, the first target temperature value and the second target temperature value can be between 100°C and 150°C. In practice, the first target temperature value and the second target temperature value can be set to be the same or different. Furthermore, the temperature of the first heating gas and the temperature of the second heating gas can be set to be the same or different. In this embodiment, the first target temperature value, the temperature of the first heating gas, the second target temperature value, and the temperature of the second heating gas are the same for ease of control. Specifically, 100°C can be selected.

[0056] It should be noted that the process of evacuating the inner liner 21 before drawing in gas is independent of the process of evacuating the inner liner 21 before drawing in gas. Therefore, the order of evacuating the inner liner 21 and drawing in gas in the inner liner 22 can be adjusted to overlap or partially overlap. That is, the inner liner 21 and the inner liner 22 can be evacuated simultaneously to optimize the overall heating time. Alternatively, the inner liner 21 can be evacuated first, followed by the inner liner 22. Or, the inner liner 22 can be evacuated first, followed by the inner liner 21. The attached drawings are only for illustrating one embodiment, and this embodiment does not impose specific restrictions on the order of the initial evacuation of the inner liner 21 and the inner liner 22.

[0057] In addition, the first heating gas and the second heating gas can be heated nitrogen or dry air, etc. In this embodiment, the first heating gas is dry air or a mixture of air and nitrogen, or nitrogen. The second heating gas is dry nitrogen.

[0058] Finally, in step S500: further evacuate the interlayer 22 until the vacuum pressure of the interlayer 22 reaches the target value, which is lower than the second preset value.

[0059] In this embodiment, after the inner liner 21 reaches the first target temperature value and the interlayer 22 reaches the second target temperature value, the interlayer 22 is further evacuated. This reduces heat loss caused by the absorption of heat from the interlayer 22 by the low-temperature inner liner 21, improves heating efficiency, and ensures that the interlayer 22 can reach the second target temperature value more quickly to achieve further evacuation, thereby obtaining the target value. Specifically, the target value is 10. -1 When the vacuum pressure of the interlayer 22 reaches the target value below Pa, the gas cylinder 2 can be sealed and the gas cylinder can be removed from the furnace to complete the production.

[0060] This application first evacuates the inner liner 21 and the interlayer 22 separately, creating a negative pressure state inside the entire inner liner 21 and interlayer 22. Then, it uses the negative pressure of the inner liner 21 and interlayer 22 to draw in heating gas. This allows the heating gas to actively and quickly penetrate into the inner liner 21 and interlayer 22 under the action of pressure difference, and can overcome the resistance of the insulation material. This allows the heating gas to evenly fill all areas of the inner liner 21 and interlayer 22, reducing dead zones in the flow of heating gas, achieving sufficient heat exchange, significantly shortening the heating time of the inner liner 21 and interlayer 22, greatly improving the heating efficiency of the inner liner 21 and interlayer 22, reducing heat consumption, and finally further evacuating the interlayer 22 to achieve the target value. Furthermore, the heating gas in this application is actively drawn into the inner liner 21 and the interlayer 22, which overcomes the problem of traditional high-pressure gas not being able to penetrate the gas cylinder 2 when directly purging it. It also avoids damage to the internal pipelines and insulation materials caused by high-pressure gas entering the gas cylinder 2, thus improving the safety of heating the gas cylinder 2. In addition, since the insulation material surrounding the inner liner 21 is generally composed of aluminum foil and fiberglass paper, it has good insulation properties. Therefore, heat from outside the gas cylinder 2 is difficult to transfer to the inside, resulting in a slow temperature rise in the inner liner 21. Conventional heating methods are inefficient and energy-intensive. This application, by creating a negative pressure state between the inner liner 21 and the interlayer 22 before heating, ensures that both the inner liner 21 and the interlayer 22 are rapidly heated to their target temperatures. This reduces heat loss caused by the absorption of heat from the interlayer 22 by the low-temperature inner liner 21, improving heating efficiency and ensuring that the interlayer 22 reaches the second target temperature more quickly for further vacuuming, thereby obtaining the target temperature.

[0061] Furthermore, refer to Figure 2 In step 200 above, heating the inner liner 21 to the first target temperature value includes the following steps:

[0062] Step S210: Obtain the current temperature value of the inner liner 21.

[0063] Step S220: Determine whether the current temperature value of the inner liner 21 has reached the first target temperature value.

[0064] Step S230: When the current temperature value of the inner liner 21 has not reached the first target temperature value, the vacuuming of the inner liner 21 of the gas cylinder 2 is repeated until the vacuum pressure of the inner liner 21 reaches the first preset value; the inner liner 21 draws in the first heating gas under negative pressure. That is, steps S100 and S200 are repeated.

[0065] In the above steps, if the current temperature of the inner liner 21 has not reached the first target temperature after one vacuuming and intake of the first heating gas, the inner liner 21 is controlled to repeat the vacuuming and intake of the first heating gas, and the vacuuming cycle is repeated at least once. When the current temperature of the inner liner 21 reaches the first target temperature, the cycle is exited and the vacuuming of the inner liner 21 is stopped. Because the heating effect of the inner liner 21 inhaling the first heating gas once may not be ideal, this application accelerates the heat transfer of the first heating gas by performing multiple vacuuming cycles on the inner liner 21, realizing precise closed-loop temperature control of the heating process of the inner liner 21, thereby rapidly increasing the temperature of the inner liner 21, ensuring that it is fully and reliably heated to the precise temperature required by the process, providing an accurate temperature basis for subsequent steps, and shortening the heating time and reducing gas consumption.

[0066] In reality, if the initial temperature of the inner liner 21 differs significantly from the first target temperature, or if the first preset value for vacuuming the inner liner 21 is high and the vacuum level is low, or if the temperature of the first heating gas differs slightly from the first target temperature, the first heating gas may not be able to fully heat the inner liner 21 in one go, and multiple vacuuming cycles may be required.

[0067] In other embodiments, the inner liner 21 may reach the first target temperature value after it first inhales the first heating gas. Alternatively, a fixed number of air extraction cycles (such as two to six cycles) can be set, and the first target temperature value of the inner liner 21 is considered to be reached once the preset number of cycles is completed.

[0068] Furthermore, refer to Figure 3 The above-mentioned process of heating the inner liner 21 to the first target temperature also includes the following steps:

[0069] Step S240: Obtain the temperature of the gas extracted from the inner liner 21 during vacuuming, and use the temperature of the gas extracted from the inner liner 21 during vacuuming as the current temperature value of the inner liner 21.

[0070] Step S250: If the current temperature value of the inner liner 21 has not reached the first target temperature value, continue to evacuate the inner liner 21 until the vacuum pressure of the inner liner 21 reaches the first preset value.

[0071] Step S260: If the current temperature value of the inner liner 21 reaches the first target temperature value, stop evacuating the inner liner 21.

[0072] In the above steps, by judging the temperature of the gas extracted from the inner liner 21 during the vacuuming process in step S100, the system controls whether to continue vacuuming the inner liner 21, thereby achieving feedback regulation.

[0073] If the gas temperature obtained from the vacuuming of the inner liner 21 does not reach the first target temperature value of the inner liner 21, then step S100 is executed to continue evacuating the inner liner 21 until the vacuum pressure of the inner liner 21 reaches the first preset value. Then step S200 is executed to allow the inner liner 21 to draw in the first heating gas under negative pressure for heating, thus completing one vacuuming cycle of the inner liner 21.

[0074] If the temperature of the gas obtained from the vacuum extraction of the inner liner 21 reaches the first target temperature value of the inner liner 21, the vacuum extraction of the inner liner 21 is stopped. After the vacuum extraction of the inner liner 21 is stopped, the inner liner 21 can be controlled to re-inhale the first heating gas under negative pressure, so that the vacuum pressure of the inner liner 21 is restored, completing the last vacuum extraction cycle of the inner liner 21.

[0075] Specifically, a temperature sensor can be installed on the vacuum pipe of the inner liner 21. The temperature of the extracted gas can be used as the current temperature value of the inner liner 21, making it convenient to obtain the temperature value of the inner liner 21. This application provides an efficient and non-invasive temperature monitoring solution that eliminates the need to install sensors inside the gas cylinder 2, simplifying the system and reducing costs.

[0076] In some other embodiments, a temperature sensor can be installed inside the inner liner 21 to directly read the temperature of the inner liner 21. The temperature of the inner liner 21 is used to determine whether to continue vacuuming and drawing in the first heating gas.

[0077] Furthermore, refer to Figure 4 The inner liner 21 described above draws in the first heated gas under negative pressure, including the following steps:

[0078] Step S270: The inner liner 21 draws in the first heated gas under negative pressure and maintains it for a first set time.

[0079] In the above steps, by controlling the inner liner 21 to continuously draw in the first heating gas for a first set time, the continuously drawn-in first heating gas can fully exchange heat with the gas in the inner liner 21 within the preset time. Furthermore, after the inner liner 21 continuously draws in the first heating gas, the vacuum pressure of the inner liner 21 can be gradually restored, which can prepare for the next air extraction cycle of the inner liner 21.

[0080] Step S280: The first set time is 10 min to 20 min.

[0081] In the above steps, the time for the inner liner 21 to absorb the first heating gas is not less than 10 minutes, so that the first heating gas has sufficient time to exchange heat and diffuse with the inner liner 21, thereby improving the uniformity and thoroughness of heating. Furthermore, the time for the inner liner 21 to absorb the first heating gas is not more than 20 minutes, which not only ensures that the first heating gas can roughly complete the heat exchange with the inner liner 21, but also reduces the heat exchange time and maximizes the benefits.

[0082] In other embodiments, the temperature change of the inner liner 21 can be tested to determine whether the temperature of the inner liner 21 has stabilized, thereby determining whether the first heating gas has achieved sufficient heat exchange with the inner liner 21. After the inner liner 21 finishes drawing in the first heating gas, if the current temperature of the inner liner 21 has not reached the first target temperature value, steps S100 and S200 are repeated to continue evacuating the inner liner 21 and drawing in the first heating gas for further heating. If the current temperature of the inner liner 21 reaches the first target temperature value, the evacuation of the inner liner 21 is stopped.

[0083] Furthermore, refer to Figure 5 The above-mentioned heating of the interlayer 22 to the second target temperature value includes the following steps:

[0084] Step S410: Obtain the current temperature value of interlayer 22;

[0085] Step S420: Determine whether the current temperature value of the interlayer 22 has reached the second target temperature value;

[0086] Step S430: When the current temperature value of the interlayer 22 has not reached the second target temperature value, the vacuuming of the interlayer 22 of the gas cylinder 2 is repeated until the vacuum pressure of the interlayer 22 reaches the second preset value; the interlayer 22 draws in the second heating gas under negative pressure. That is, steps S300 and S400 are repeated.

[0087] In the above steps, if the current temperature of the interlayer 22 has not reached the second target temperature after one vacuuming and intake of the second heating gas, the interlayer 22 is controlled to repeat the vacuuming and intake of the second heating gas, and the vacuuming cycle is repeated at least once. When the current temperature of the interlayer 22 reaches the second target temperature, the cycle is exited and the vacuuming of the interlayer 22 is stopped. Because the heating effect of a single intake of the second heating gas by the interlayer 22 may not be ideal, this application accelerates the heat transfer of the second heating gas by performing multiple vacuuming cycles on the interlayer 22, realizing precise closed-loop temperature control of the heating process of the interlayer 22, thereby rapidly increasing the temperature of the interlayer 22, ensuring that it is fully and reliably heated to the precise temperature required by the process, providing an accurate temperature basis for subsequent steps, and shortening the heating time and reducing gas consumption.

[0088] In fact, referring to the air extraction cycle of the inner liner 21, the air extraction cycle of the interlayer 22 can be repeated only once or multiple times, which will not be described again in this embodiment.

[0089] Furthermore, refer to Figure 6 The above-mentioned heating of the interlayer 22 to the second target temperature value also includes the following steps:

[0090] Step S440: Obtain the temperature of the gas extracted from the interlayer 22 by vacuuming, and use the temperature of the gas extracted from the interlayer 22 by vacuuming as the current temperature value of the interlayer 22;

[0091] Step S450: If the current temperature value of the interlayer 22 has not reached the second target temperature value, continue to evacuate the interlayer 22 until the vacuum pressure of the interlayer 22 reaches the second preset value.

[0092] Step S460: If the current temperature value of the interlayer 22 reaches the second target temperature value, stop evacuating the interlayer 22.

[0093] In the above steps, by judging the temperature of the gas extracted from the interlayer 22 in real time during step S300, the system can control whether to continue evacuating the interlayer 22, thereby achieving temperature feedback regulation.

[0094] If the gas temperature obtained from the vacuuming of the interlayer 22 does not reach the second target temperature value of the interlayer 22, then step S300 is executed to continue evacuating the interlayer 22 until the vacuum pressure of the interlayer 22 reaches the second preset value. Then step S400 is executed to allow the interlayer 22 to draw in the second heating gas under negative pressure for heating, thus completing one vacuuming cycle of the interlayer 22.

[0095] If the gas temperature obtained from the vacuum extraction of interlayer 22 reaches the second target temperature value of interlayer 22, the vacuum extraction of interlayer 22 is stopped. After the vacuum extraction of interlayer 22 is stopped, the interlayer 22 can be controlled to re-intake the second heating gas under negative pressure, so that the vacuum pressure of interlayer 22 is restored, and the last vacuum extraction cycle of interlayer 22 is completed.

[0096] Specifically, a temperature sensor can be installed on the pipe through which the vacuum is drawn in the interlayer 22. The temperature of the extracted gas can be used as the current temperature value of the interlayer 22, making it convenient to obtain the temperature value of the interlayer 22. This application provides an efficient and non-invasive temperature monitoring solution that eliminates the need to install sensors inside the gas cylinder 2, simplifying the system and reducing costs.

[0097] In some other embodiments, a temperature sensor can be installed within the interlayer 22 to directly read its temperature. The temperature of the interlayer 22 is then used to determine whether to continue evacuating the vacuum and drawing in the first heating gas.

[0098] Furthermore, refer to Figure 7 The aforementioned interlayer 22 draws in a second heated gas under negative pressure, comprising the following steps:

[0099] Step S470: The interlayer 22 draws in the second heating gas under negative pressure and maintains it for a second set time.

[0100] In the above steps, by controlling the jacket 22 to continuously draw in the second heating gas for a second set time, the continuously drawn-in second heating gas can fully exchange heat with the gas in the jacket 22 within the preset time. Furthermore, as the jacket 22 continuously draws in the second heating gas, the vacuum pressure of the jacket 22 can be gradually restored, which can prepare for the next gas extraction cycle of the jacket 22.

[0101] Step S480: The second set time is 10min~20min.

[0102] In the above steps, the time for the interlayer 22 to draw in the second heating gas is no less than 10 minutes, allowing sufficient time for the second heating gas to exchange heat and diffuse with the interlayer 22, thereby improving the uniformity and thoroughness of heating. Furthermore, the time for the interlayer 22 to draw in the second heating gas is no more than 20 minutes, ensuring that the second heating gas can largely complete heat exchange with the interlayer 22 and reducing the heat exchange time to maximize efficiency. After the interlayer 22 finishes drawing in the second heating gas, if the current temperature of the interlayer 22 has not reached the second target temperature, step S300 is repeated to continue evacuating the interlayer 22. If the current temperature of the interlayer 22 reaches the second target temperature, evacuating the interlayer 22 is stopped.

[0103] Furthermore, the gas cylinder 2 is placed inside the heating furnace 1, which is equipped with a heating device 11 for heating the interior of the furnace 1. The heating furnace 1 can heat the exterior of the gas cylinder 2, reducing heat exchange between the inside and outside of the gas cylinder 2 and thus reducing heat loss inside the gas cylinder 2.

[0104] Reference Figure 8 The gas cylinder heating method also includes the following steps:

[0105] Step S010: Before evacuating the inner liner 21 of the gas cylinder 2, control the heating device 11 to turn on, so that the heating furnace 1 is heated to the third target temperature value.

[0106] In this step, the heating furnace 1 transfers the heat generated by the heating device 11 to the gas cylinder 2, thereby raising the temperature of the gas cylinder 2 and reducing the heat exchange between the jacket 22 and the inner liner 21 and the outside environment.

[0107] Step S020: Obtain the current temperature value inside the heating furnace 1. When the current temperature value of the heating furnace 1 is lower than the third target temperature value, control the heating device 11 to turn on until the current temperature value of the heating furnace 1 reaches the third target temperature value.

[0108] In this step, the heating device 11 is started and stopped by controlling the current temperature value of the heating furnace 1, thereby achieving temperature balance inside the heating furnace 1, achieving optimal economic energy consumption, and keeping the gas cylinder 2 warm so that the jacket 22 can maintain the second target temperature during further vacuuming. In addition, the current temperature value inside the heating furnace 1 can be obtained by installing a temperature sensor inside the heating furnace 1.

[0109] In this embodiment, after heating to the third target temperature value in the heating furnace 1, the inner liner 21 and the interlayer 22 are evacuated respectively, that is, steps S100 and S300 are executed.

[0110] Furthermore, refer to Figure 9 The gas cylinder heating method also includes the following steps:

[0111] S011: The heating device 11 is used to heat the gas and deliver it into the heating furnace 1, thereby heating the interior of the heating furnace 1 so that the heating furnace 1 is maintained at the third target temperature value.

[0112] S030: After the heating furnace 1 is maintained at the third target temperature value, the gas in the heating furnace 1 is the first heating gas, which is drawn in by the inner liner 21 under negative pressure to heat the inner liner 21.

[0113] In the above steps, the high-temperature air in the heating furnace 1 can be drawn in by the inner liner 21, thereby heating the inner liner 21 and improving energy utilization.

[0114] Furthermore, refer to Figure 10 The gas cylinder heating method also includes the following steps:

[0115] Step S110: The gas extracted from the inner liner 21 is discharged into the heating furnace 1 through vacuuming.

[0116] After the inner liner 21 of gas cylinder 2 is evacuated as described above, the gas extracted from the inner liner 21 is discharged into the heating furnace 1. The residual warm air extracted from the inner liner 21 is circulated back into the heating furnace 1, which utilizes the residual warm air and reduces system heat loss.

[0117] Step S310: The gas extracted from the jacket 22 by vacuuming is discharged into the heating furnace 1.

[0118] After the aforementioned vacuuming of the jacket 22 of gas cylinder 2, the gas extracted from the jacket 22 is discharged into the heating furnace 1. The residual warm air extracted from the jacket 22 is then circulated back into the heating furnace 1, utilizing the residual warm air and reducing system heat loss.

[0119] Reference Figure 11 Furthermore, the gas cylinder heating method also includes the following steps:

[0120] Step S111: After the gas extracted from the inner liner 21 is heated to the third target temperature value, it is discharged into the heating furnace 1, which helps to avoid heat loss from the heating furnace 1.

[0121] Step S311: After the gas extracted from the jacket 22 is heated to the third target temperature value, it is discharged into the heating furnace 1, which helps to avoid heat loss from the heating furnace 1.

[0122] In some specific embodiments, the gas cylinder heating method includes the following steps:

[0123] The heating device 11 is turned on, so that the heating furnace 1 is heated to the third target temperature value (100°C).

[0124] Vacuum the inner liner 21 of gas cylinder 2.

[0125] The gas extracted from the inner liner 21 by vacuuming is discharged into the heating furnace 1.

[0126] The temperature of the gas extracted from the inner liner 21 during vacuuming is obtained as the current temperature value of the inner liner 21.

[0127] If the current temperature of the inner liner 21 has not reached the first target temperature (100℃), continue to evacuate the inner liner 21 until the vacuum pressure of the inner liner 21 reaches the first preset value (100Pa).

[0128] The inner liner 21 draws in the first heating gas (100°C) from the heating furnace 1 under negative pressure and maintains it for a first set time (15 min).

[0129] Repeat the above process of evacuating the inner liner 21 of gas cylinder 2 and drawing in the first heating gas until the current temperature of the inner liner 21 reaches the first target temperature (100°C), then stop evacuating the inner liner 21.

[0130] Vacuum the interlayer 22 of gas cylinder 2.

[0131] The gas extracted from the vacuum layer 22 is discharged into the heating furnace 1.

[0132] The temperature of the gas extracted from the vacuum layer 22 is obtained as the current temperature value of the vacuum layer 22.

[0133] If the current temperature of the interlayer 22 has not reached the second target temperature (100℃), continue to evacuate the interlayer 22 until the vacuum pressure of the interlayer 22 reaches the second preset value (100Pa).

[0134] The interlayer 22 draws in a second heating gas (nitrogen at 100°C) under negative pressure and maintains it for a first set time (15 min).

[0135] Repeat the above process of evacuating the jacket 22 of gas cylinder 2 and drawing in the second heating gas until the current temperature of the jacket 22 reaches the second target temperature (100°C), then stop evacuating the jacket 22.

[0136] After the above steps, the current temperature value of the inner liner 21 reaches the first target temperature value (100℃), and the current temperature value of the interlayer 22 reaches the second target temperature value (100℃).

[0137] Further evacuate the interlayer 22 until the vacuum pressure of the interlayer 22 reaches the target value (10). -1 (below Pa), the target value is lower than the second preset value.

[0138] In addition, the two circulation steps of evacuating the inner liner 21 of the gas cylinder 2 and evacuating the interlayer 22 of the gas cylinder 2 are carried out simultaneously to improve the heating efficiency of the gas cylinder 2.

[0139] In this embodiment, due to heat transfer, the heating furnace 1, inner liner 21, and jacket 22 all achieve a thermal equilibrium effect of 100°C, reducing heat loss from the gas cylinder 2 and improving heating efficiency. The gas cylinder heating method of this application can significantly reduce the heating time of the gas cylinder 2, shortening it from the current 15 hours to less than 3 hours, improving efficiency and saving energy.

[0140] Furthermore, during the further vacuuming of the interlayer 22, the heating furnace 1 can maintain the third target temperature value of 100°C under the action of the heating device 11, so that the interlayer 22 and the inner liner 21 can also maintain their respective target temperature values, avoid heat loss from the gas cylinder 2, and maintain the effect of vacuuming the interlayer 22.

[0141] Reference Figure 12 This application also provides a gas cylinder heating system for performing the above-described gas cylinder heating method, comprising: a heating furnace 1, a gas cylinder 2, a first gas outlet pipe 3, a second gas outlet pipe 4, a first gas inlet pipe 5, and a second gas inlet pipe 6.

[0142] A heat preservation space is formed inside the heating furnace 1. The heating furnace 1 is equipped with a heating device 11, which is used to heat the gas to a preset temperature value and transport it into the heat preservation space.

[0143] Gas cylinder 2, set in an insulated space, includes an outer shell 23 and an inner liner 21 set inside the outer shell 23, with a sandwich 22 formed between the inner wall of the outer shell 23 and the outer wall of the inner liner 21;

[0144] The first vent pipe 3 has its inlet connected to the inside of the inner liner 21. The first vent pipe 3 is equipped with a first vacuum pump 31 and a first switching valve 32. The first vacuum pump 31 is used to extract the gas from the inner liner 21.

[0145] The first air inlet pipe 5 is connected between the heat preservation space and the interior of the inner liner 21, and is used to introduce the gas in the heating furnace 1 into the inner liner 21. The first air inlet pipe 5 is equipped with a third switch valve 51.

[0146] The second exhaust pipe 4 has an inlet connected to the interior of the interlayer 22. The second exhaust pipe 4 is equipped with a second vacuum pump 41 and a second switching valve 42. The second vacuum pump 41 is used to extract the gas from the interlayer 22.

[0147] The second air intake pipe 6 has an air inlet for drawing in gas and an air outlet connected to the interior of the interlayer 22. The second air intake pipe 6 is equipped with a fourth switch valve 61.

[0148] When the inner liner 21 needs to be evacuated, the first vacuum pump 31 and the first switch valve 32 are turned on, and the third switch valve 51 is turned off. When the inner liner 21 needs to draw in the first heating gas, the first vacuum pump 31 and the first switch valve 32 are turned off, and the third switch valve 51 is turned on.

[0149] When the jacket 22 needs to be evacuated, the second vacuum pump 41 and the second switching valve 42 are turned on, and the fourth switching valve 61 is turned off. When the jacket 22 needs to draw in the second heating gas, the second vacuum pump 41 and the second switching valve 42 are turned off, and the fourth switching valve 61 is turned on.

[0150] In another embodiment, the first vent pipe 3 is equipped with a first temperature sensor 33 and a first vacuum gauge 34. The first temperature sensor 33 is used to obtain the temperature of the gas extracted from the inner liner 21 during vacuuming, as the current temperature value of the inner liner 21. The first vacuum gauge 34 is used to obtain the pressure of the gas extracted from the inner liner 21 during vacuuming, as the vacuum pressure of the inner liner 21.

[0151] This application can control the start and stop of the first vacuum pump 31, the first switching valve 32, and the third switching valve 51 based on the temperature detected by the first temperature sensor 33 and the vacuum pressure detected by the first vacuum gauge 34.

[0152] The second exhaust pipe 4 is equipped with a second temperature sensor 43 and a second vacuum gauge 44. The second temperature sensor 43 is used to obtain the temperature of the gas extracted from the interlayer 22 during vacuuming, as the current temperature value of the interlayer 22. The second vacuum gauge 44 is used to obtain the pressure of the gas extracted from the interlayer 22 during vacuuming, as the vacuum pressure of the interlayer 22.

[0153] This application can control the start and stop of the second vacuum pump 41, the second switching valve 42, and the fourth switching valve 61 based on the temperature detected by the second temperature sensor 43 and the vacuum pressure detected by the second vacuum gauge 44.

[0154] In another embodiment, the heating furnace 1 is equipped with a third temperature sensor 12 for detecting the temperature of the insulation space. Initially, the first vacuum pump 31, first switching valve 32, third switching valve 51, second vacuum pump 41, second switching valve 42, and fourth switching valve 61 are closed. When the third temperature sensor 12 detects that the temperature of the insulation space reaches a third target temperature value, it controls the first vacuum pump 31 and first switching valve 32, second vacuum pump 41 and second switching valve 42 to open. In this embodiment, the first switching valve 32, second switching valve 42, third switching valve 51, and fourth switching valve 61 can be solenoid valves.

[0155] In some embodiments, at least two gas cylinders 2 are provided, and at least two gas cylinders 2 are located in an insulated space, where at least two gas cylinders 2 are simultaneously heated and evacuated to improve production efficiency. Specifically, at least two gas cylinders 2 are placed on a frame, and at least two gas cylinders 2 are stacked into two or more layers to form a group of gas cylinders 2. Each group of gas cylinders 2 is placed side by side in the reheating furnace 1 to improve the utilization rate of the furnace space.

[0156] Furthermore, the outlet of the first vent pipe 3 is connected to the insulation space. The gas extracted from the inner liner 21 can be returned to the insulation space of the heating furnace 1, utilizing the residual heat gas to improve the thermal energy utilization rate.

[0157] In some embodiments, the first gas outlet pipe 3 is also provided with a first pipe heater 35, which is used to reheat the gas extracted from the inner liner 21 and then pass it into the heating furnace 1, thereby reducing the impact on the temperature in the heat preservation space and reducing heat loss.

[0158] Furthermore, the outlet of the second exhaust pipe 4 is connected to the insulation space. The gas extracted from the interlayer 22 can be returned to the insulation space of the heating furnace 1, utilizing the residual heat gas to improve the thermal energy utilization rate.

[0159] In some embodiments, a second pipe heater is also provided on the second gas outlet pipe 4 to reheat the gas extracted from the interlayer 22 and then pass it into the heating furnace 1, thereby reducing the impact on the temperature in the insulation space and reducing heat loss.

[0160] In this embodiment, the first pipe heater 35 and the second pipe heater can be two separate heating elements, or they can be the same heating element, reducing the number of pipe connections.

[0161] Furthermore, a filter 52 is provided on the first air intake pipe 5 to filter out impurities such as moisture in the high-temperature gas in the heat-insulated space.

[0162] In this embodiment, the heating device 11 includes a burner and a fan. The burner mixes outside air with natural gas for combustion, and the heat from the combustion is blown into the heating furnace 1 by the fan. The heating furnace 1 is sealed after the gas cylinder 2 is placed inside, and the heating furnace 1 is equipped with an exhaust pipe.

[0163] To improve heat exchange efficiency, this application employs three channels for overall heating of the gas cylinder 2: heating the outer shell 23, evacuating and circulating the inner liner 21, and evacuating and circulating the interlayer 22.

[0164] In a specific embodiment, the gas cylinder 2 is placed in a sealed heat preservation furnace, and the fan and burner are turned on to transfer heat to the heating furnace 1 and to the outer shell 23 of the gas cylinder 2, so that the outer shell 23 is heated. At the same time, the fan and burner are controlled to start and stop through the third temperature sensor 12 in the heat preservation space to achieve temperature balance in the heating furnace 1 and achieve optimal economic energy consumption.

[0165] The temperature inside the insulation space is monitored by the third temperature sensor 12, and the temperature inside the insulation space of the furnace to be heated rises to 100°C.

[0166] The first switch valve 32 and the first vacuum pump 31 are opened to extract the air from the inner liner 21. The residual air is heated to 100°C by the first pipe heater 35 and returned to the heating furnace 1, utilizing the residual heat to reduce heat loss. When the vacuum pressure of the inner liner 21 is detected to be below 100Pa by the first vacuum gauge 34, the first switch valve 32 is automatically closed and the third switch valve 51 is opened. The high-temperature air (first heating gas) in the heating furnace 1 enters the inner liner 21 after being filtered by the filter 52. The first heating gas continues to fill the inner liner 21 for 15 minutes to achieve sufficient heat exchange. Then, the third switch valve 51 is closed and the first switch valve 32 and the first vacuum pump 31 are opened to continue the next inner liner 21 evacuation cycle. After the first temperature sensor 33 detects that the outlet temperature of the inner liner 21 has reached 100°C, the first switch valve 32, the first vacuum pump 31, and the third switch valve 51 are closed.

[0167] The second switch valve 42 and the second vacuum pump 41 are opened to extract the air from the jacket 22. The residual air is heated to 100°C by the first pipe heater 35 and returned to the heating furnace 1, utilizing the residual air to reduce heat loss. When the vacuum pressure of the jacket 22 is detected to be below 100Pa by the second vacuum gauge 44, the second switch valve 42 is automatically closed and the fourth switch valve 61 is opened, allowing dry, oil-free nitrogen gas to enter the jacket 22 through the third pipe heater 62. The second heating gas is continuously introduced into the jacket 22 for 15 minutes to ensure sufficient heat exchange. Then, the fourth switch valve 61 is closed, and the second switch valve 42 and the second vacuum pump 41 are opened to continue the next jacket 22 evacuation cycle. The evacuation cycle of the jacket 22 is stopped when the outlet temperature of the jacket 22 reaches the second target temperature of 100°C, and the second switch valve 42, the second vacuum pump 41, and the fourth switch valve 61 are closed.

[0168] Furthermore, a vacuum pump unit 7 is connected to the interlayer 22, which is used to further evacuate the interlayer 22 after the interlayer 22 and the inner liner 21 have reached their respective target temperatures, until the air pressure in the interlayer 22 reaches 10. -1 Below Pa.

[0169] In the gas cylinder heating system disclosed in this application, the heating device 11 is used to heat the interior of the heating furnace 1 and generate a first heating gas within the heating furnace 1. The first inlet pipe 5 connects the heating furnace 1 and the inner liner 21, and the second inlet pipe 6 is used to transport the heated second heating gas to the interlayer 22. During the heating process of the gas cylinder 2, the inner liner 21 can directly draw in the first heating gas from the furnace, thereby using the high-temperature gas in the furnace to quickly raise the temperature of the inner liner 21 of the gas cylinder 2. At the same time, the second heating gas is used to heat the interlayer 22, solving the problem that the temperature of the inner liner 21 of the gas cylinder 2 rises slowly due to the insulation material of the interlayer 22. By heating the heating furnace 1, the inner liner 21, and the interlayer 22 separately, this application can reduce heat exchange between the inside and outside of the gas cylinder 2, thereby reducing heat loss inside the gas cylinder 2, improving the heating efficiency of the gas cylinder 2, and enabling the interlayer 22 of the gas cylinder 2 to be rapidly raised to the vacuum process temperature, thus reducing energy consumption. Furthermore, the gas inside the heating furnace 1 can be drawn into the inner liner 21 under negative pressure, thereby heating the inner liner 21 without the need for additional gas heating equipment to heat the inner liner 21.

[0170] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

Claims

1. A method for heating a gas cylinder, characterized in that, Includes the following steps: Vacuum the inner liner of the gas cylinder until the vacuum pressure of the inner liner reaches a first preset value; The inner liner draws in the first heating gas under negative pressure, thereby heating the inner liner to the first target temperature value; Vacuum the interlayer of the gas cylinder until the vacuum pressure of the interlayer reaches the second preset value; The interlayer draws in a second heating gas under negative pressure, thereby heating the interlayer to a second target temperature value; The interlayer is further evacuated until the vacuum pressure of the interlayer reaches the target value, which is lower than the second preset value. The inner liner draws in the first heating gas under negative pressure and maintains it for a first set time; The first set time is between 10 and 20 minutes; The interlayer draws in a second heating gas under negative pressure and maintains it for a second set time; The second set time is 10 min to 20 min; The gas cylinder is placed inside a heating furnace, and the heating furnace is equipped with a heating device for heating the interior of the heating furnace. Before evacuating the inner liner of the gas cylinder, the heating device is turned on to heat the furnace to the third target temperature value. The current temperature value inside the heating furnace is obtained. When the current temperature value of the heating furnace is lower than the third target temperature value, the heating device is controlled to turn on until the current temperature value of the heating furnace reaches the third target temperature value. The heating device is used to heat the gas and deliver it into the heating furnace, thereby heating the interior of the heating furnace to maintain the heating furnace at the third target temperature value; After the heating furnace maintains the third target temperature value, the gas inside the heating furnace is used as the first heating gas and is drawn into the inner liner under negative pressure to heat the inner liner. The first preset value is 100Pa~1000Pa; The second preset value is 100Pa~1000Pa.

2. The gas cylinder heating method according to claim 1, characterized in that, The process of heating the inner liner to the first target temperature value includes the following steps: Obtain the current temperature value of the inner liner; Determine whether the current temperature of the inner liner has reached the first target temperature value; When the current temperature of the inner liner does not reach the first target temperature, the vacuuming of the inner liner of the gas cylinder is repeated until the vacuum pressure of the inner liner reaches the first preset value; the inner liner draws in the first heating gas under negative pressure.

3. The gas cylinder heating method according to claim 2, characterized in that, The step of heating the inner liner to the first target temperature value further includes the following steps: The temperature of the gas extracted from the inner liner during vacuuming is obtained, and the temperature of the gas extracted from the inner liner during vacuuming is used as the current temperature value of the inner liner. If the current temperature of the inner liner does not reach the first target temperature, continue to evacuate the inner liner until the vacuum pressure of the inner liner reaches the first preset value. If the current temperature of the inner liner reaches the first target temperature, stop evacuating the inner liner.

4. The gas cylinder heating method according to claim 1, characterized in that, The process of heating the interlayer to the second target temperature value includes the following steps: Obtain the current temperature value of the interlayer; Determine whether the current temperature value of the interlayer has reached the second target temperature value; When the current temperature value of the interlayer does not reach the second target temperature value, the vacuuming of the interlayer of the gas cylinder is repeated until the vacuum pressure of the interlayer reaches the second preset value; the interlayer draws in the second heating gas under negative pressure.

5. The gas cylinder heating method according to claim 4, characterized in that, The step of heating the interlayer to the second target temperature value further includes the following steps: The temperature of the gas extracted during vacuuming of the interlayer is obtained, and the temperature of the gas extracted during vacuuming of the interlayer is used as the current temperature value of the interlayer; If the current temperature value of the interlayer has not reached the second target temperature value, continue to evacuate the interlayer until the vacuum pressure of the interlayer reaches the second preset value; If the current temperature of the interlayer reaches the second target temperature, stop evacuating the interlayer.

6. The gas cylinder heating method according to claim 1, characterized in that, The gas extracted by vacuuming the inner liner is discharged into the heating furnace. The gas extracted by the vacuuming of the interlayer is discharged into the heating furnace.

7. The gas cylinder heating method according to claim 6, characterized in that, It also includes the following steps: The gas extracted from the inner liner by vacuuming is heated to the third target temperature value and then discharged into the heating furnace. The gas extracted by vacuuming the interlayer is heated to the third target temperature value and then discharged into the heating furnace.

8. A gas cylinder heating system, characterized in that, For performing the gas cylinder heating method as described in any one of claims 1 to 7, comprising: A heating furnace with an insulated space inside, the heating furnace being equipped with a heating device for heating gas to a preset temperature value and conveying it into the insulated space; A gas cylinder, disposed within the insulated space, includes an outer shell and an inner liner disposed within the outer shell, with an interlayer formed between the inner wall of the outer shell and the outer wall of the inner liner; The first vent pipe has an inlet connected to the inside of the inner liner. The first vent pipe is equipped with a first vacuum pump and a first switching valve. The first vacuum pump is used to extract the gas from the inner liner. The second vent pipe has an inlet connected to the interior of the interlayer. The second vent pipe is equipped with a second vacuum pump and a second switching valve. The second vacuum pump is used to extract the gas from the interlayer. The first air intake pipe is connected between the insulation space and the interior of the inner liner, and is used to introduce gas from the insulation space into the inner liner. A third switch valve is provided on the first air intake pipe. The second air intake pipe has an air inlet for drawing in gas and an air outlet connected to the interior of the interlayer. A fourth switching valve is provided on the second air intake pipe.

9. The gas cylinder heating system according to claim 8, characterized in that, The outlet of the first air outlet pipe is connected to the heat preservation space; The outlet of the second air outlet pipe is connected to the insulated space.

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