A gas pretreatment liquefaction filling protection system

Abstract

This application relates to a gas pretreatment liquefaction filling protection system, specifically within the technical field of liquefied natural gas (LNG) filling equipment. The filling protection system includes an LNG supply mechanism for supplying LNG; a gas storage cylinder for dispensing LNG; a filling pipe, one end of which is connected to the LNG supply mechanism, and the other end to the gas storage cylinder, with the filling pipe and the gas storage cylinder being detachably connected; an exhaust pipe, one end of which is connected to the gas storage cylinder, and the exhaust pipe is also detachably connected to the gas storage cylinder; and a liquid nitrogen protection mechanism, including a liquid nitrogen supply component and a protective sleeve. The protective sleeve is fitted over the outside of the filling pipe, with its inner wall spaced apart from the outer wall of the filling pipe, and is connected to the liquid nitrogen supply component. This application, through the liquid nitrogen protection mechanism, can reduce the ambient temperature of the LNG and minimize unnecessary vaporization losses during the LNG filling process.

Description

Technical Field

[0001] This application relates to the technical field of liquefied natural gas filling equipment, and in particular to a gas pretreatment liquefied filling protection system. Background Technology

[0002] A liquefied natural gas (LNG) filling machine is a device used to fill LNG from LNG storage tanks into gas cylinders or other containers.

[0003] Currently, liquefied natural gas (LNG) filling machines include LNG cryogenic storage tanks, cryogenic liquid pumps, filling pipelines, gas cylinders, and pressure relief pipelines.

[0004] The gas storage cylinder is used to dispense liquefied natural gas (LNG). A typical gas storage cylinder mainly consists of an insulated tank, a valve body, and a gas supply pipe. The valve body is located at the opening of the insulated tank and contains a filling port, an vent, and a gas supply channel. Both the filling port and the vent vertically penetrate the valve body and contain a valve core mechanism. This valve core mechanism controls the automatic opening and closing of the corresponding filling port or vent. The gas supply pipe is connected to the gas supply pipeline. The gas supply channel allows natural gas to be discharged, enabling the use of the natural gas in the storage cylinder. The filling port allows for the filling of LNG, and the vent allows for the discharge of vaporized LNG.

[0005] When filling liquefied natural gas (LNG) cylinders using a LNG filling machine, the cylinder is inserted into the machine. Both the filling and pressure relief lines are connected to the valve body on the cylinder, allowing the filling line to open the valve mechanism in the filling port, thus connecting the filling line to the filling port. Similarly, the pressure relief line is connected to the vent. LNG is pumped from the cryogenic storage tank using a cryogenic pump and fed into the cylinder through the filling line. During this process, some of the LNG may vaporize due to pressure drop or temperature increase, causing the pressure inside the cylinder to rise. When the pressure inside the cylinder becomes too high, the natural gas is released through the vent and pressure relief lines.

[0006] Regarding the aforementioned technologies, during liquefied natural gas (LNG) filling, the LNG flows in the filling pipeline and absorbs heat from the surrounding environment, causing the LNG temperature to rise. This leads to some of the LNG vaporizing, resulting in unnecessary vaporization losses. Summary of the Invention

[0007] This application provides a gas pretreatment liquefied gas filling protection system, the purpose of which is to reduce the ambient temperature of liquefied natural gas when using a liquefied natural gas filling machine to reduce the occurrence of liquefied natural gas vaporization, thereby reducing unnecessary vaporization losses during the liquefied natural gas filling process.

[0008] The gas pretreatment liquefaction filling protection system provided in this application adopts the following technical solution:

[0009] A gas pretreatment liquefied gas filling and protection system includes a liquefied natural gas (LNG) supply mechanism for supplying LNG; a gas storage cylinder for dispensing LNG; a filling pipe, one end of which is connected to the LNG supply mechanism and the other end of which is connected to the gas storage cylinder, and the filling pipe and the gas storage cylinder are detachably connected; an exhaust pipe, one end of which is connected to the gas storage cylinder, and the exhaust pipe and the gas storage cylinder are detachably connected; and a liquid nitrogen protection mechanism, which includes a liquid nitrogen supply component and a protective sleeve, the protective sleeve being sleeved on the outside of the filling pipe, the inner sidewall of the protective sleeve being spaced apart from the outer sidewall of the filling pipe, and the protective sleeve being connected to the liquid nitrogen supply component.

[0010] By adopting the above technical solution, the liquefied natural gas (LNG) mechanism, storage cylinder, filling pipe, and exhaust pipe are coordinated and configured. When LNG is being filled, the filling pipe is connected to the filling hole on the storage cylinder, and the exhaust pipe is connected to the exhaust hole on the storage cylinder. At this time, the LNG mechanism operates, discharging LNG into the storage cylinder through the filling pipe, thus achieving LNG filling. During the LNG filling process, some LNG undergoes vaporization loss, causing some LNG to be converted into gaseous natural gas. The generation of natural gas increases the pressure inside the storage cylinder. At this time, the natural gas is discharged from the storage cylinder through the exhaust pipe, which ensures the pressure inside the storage cylinder and thus ensures that the storage cylinder can be filled with a sufficient amount of LNG.

[0011] The liquid nitrogen protection mechanism, through the coordinated setup of the liquid nitrogen supply component and the protective sleeve, operates before liquefied natural gas (LNG) filling. LNG is introduced into the protective sleeve, allowing liquid nitrogen to enter between the inner wall of the protective sleeve and the outer wall of the filling pipe. At this time, the liquid nitrogen can provide cryogenic protection for the filling pipe, keeping it in a low-temperature environment. This reduces the heat that LNG can absorb, decreases the chance of LNG vaporization, and thus reduces unnecessary vaporization losses.

[0012] Optionally, it also includes a mounting box, in which both the inflation pipe and the exhaust pipe extend into the mounting box, and the gas storage cylinder is disposed within the mounting box.

[0013] By adopting the above technical solution, the installation box is designed so that both the inflation pipe and the deflation pipe extend into the installation box, and the gas storage cylinder is also placed inside the installation box. The installation box is designed to install the gas storage cylinder, reduce the impact of the external environment on the filling process, and ensure the stability of the filling process.

[0014] Optionally, an insulated cavity is provided in the side wall of the installation box, and a liquid nitrogen return pipe is provided between the installation box and the liquid nitrogen supply component. One end of the liquid nitrogen return pipe is connected to the liquid nitrogen supply component, and the other end is connected to the insulated cavity.

[0015] By adopting the above technical solution, the opening of the insulation cavity and the setting of the liquid nitrogen return pipe can introduce liquid nitrogen into the insulation cavity of the installation box, thereby reducing the temperature inside the installation box, that is, reducing the temperature of the environment where the gas storage cylinder is located, and thus further reducing the vaporization loss of liquefied natural gas.

[0016] Optionally, the liquid nitrogen protection mechanism further includes a liquid nitrogen recovery tank, and a liquid nitrogen recovery pipe is provided between the liquid nitrogen recovery tank and the installation box. One end of the liquid nitrogen recovery pipe is connected to the liquid nitrogen recovery tank, and the other end is connected to the insulation cavity.

[0017] By adopting the above technical solution, the liquid nitrogen recovery pipe and liquid nitrogen recovery tank are designed so that when it is necessary to recover the liquid nitrogen in the insulation cavity, the liquid nitrogen in the insulation cavity can be recovered into the liquid nitrogen recovery tank.

[0018] Optionally, the liquid nitrogen protection mechanism further includes a vaporizer, a nitrogen storage tank, and a nitrogen compressor, wherein the liquid nitrogen recovery tank, vaporizer, nitrogen storage tank, and nitrogen compressor are connected in sequence; a nitrogen return pipe is provided between the nitrogen compressor and the installation box, one end of the nitrogen return pipe is connected to the nitrogen compressor, and the other end is connected to the insulation cavity.

[0019] By adopting the above technical solution, the vaporizer can vaporize liquid nitrogen into nitrogen gas, the nitrogen storage tank is used to store the vaporized nitrogen gas, and the nitrogen compressor can pressurize the nitrogen gas and send it back to the insulation cavity through the nitrogen return pipe. At this time, the gaseous nitrogen gas can increase the pressure in the insulation cavity. Under the action of the high-pressure nitrogen gas in the insulation cavity, the liquid nitrogen can flow into the liquid nitrogen recovery tank quickly through the liquid nitrogen recovery pipe, realizing the rapid recovery of liquid nitrogen.

[0020] Optionally, the mounting box includes a mounting frame and a middle cylinder. The middle cylinder is vertically arranged, and the mounting frame is fixedly connected to the middle cylinder. The heat-insulating cavity is formed inside the side wall of the middle cylinder. A top plate is provided on the upper side of the middle cylinder, which encloses the middle cylinder. The inflation pipe and the exhaust pipe are both connected to the top plate and extend into the middle cylinder. A bottom plate is provided on the lower side of the middle cylinder, and a lifting drive component for driving the bottom plate to move vertically is provided between the middle cylinder and the bottom plate. The gas storage cylinder is vertically arranged on the upper side of the bottom plate. The gas storage cylinder is detachably connected to the bottom plate, and the gas storage cylinder is inserted into the middle cylinder. The inflation pipe and the exhaust pipe are both inserted into the gas storage cylinder vertically.

[0021] By adopting the above technical solution, the mounting frame provides stable installation for the top plate, middle cylinder, bottom plate, and lifting drive components. The top plate encloses the middle cylinder, providing stable support for the inflation and exhaust pipes. The bottom plate is used to install the gas cylinder, allowing it to be quickly installed into the middle cylinder with the assistance of the lifting drive components. This structural design automatically removes and inserts the gas cylinder from the mounting box when it needs to be replaced, reducing the possibility of workers directly contacting the middle cylinder and thus minimizing the risk of workers being frostbitten by the liquid nitrogen inside the insulation chamber.

[0022] Optionally, the outer side of the protective sleeve is covered with a heat insulation layer, and the outer side of the heat insulation layer is covered with a heat insulation layer.

[0023] By adopting the above technical solution, the insulation layer effectively isolates heat from the external environment, maintains a low temperature inside the protective casing, and reduces the vaporization of liquefied natural gas. The insulation layer further isolates heat from the external environment, improving thermal insulation performance, and also prevents workers from accidentally touching the insulation casing and suffering frostbite.

[0024] Optionally, the protective sleeve includes several segmented pipes, which are sleeved on the outside of the inflation pipe. The segmented pipes are arranged sequentially along the length of the inflation pipe, and adjacent inflation pipes are detachably connected.

[0025] By adopting the above technical solution, the protective sleeve, through the design of several segmented pipes, allows the protective sleeve to be adjusted according to the actual length of the inflation pipe, thereby improving the adaptability of the protective sleeve.

[0026] Optionally, a support ring is inserted into the segmented pipe, the support ring is sleeved on the outside of the inflation pipe, and a plurality of support elastic elements are provided on the inner side wall of the support ring. The plurality of support elastic elements are arranged sequentially at intervals along the circumference of the support ring, and all support elastic elements abut against the outer side wall of the inflation pipe.

[0027] By adopting the above technical solution, the setting of the support ring and the support elastic element provides stable support for the inflation pipe, reduces the displacement and vibration of the inflation pipe during the filling process, improves the stability of the filling pipe installation, and at the same time improves the stability of the space between the inflation pipe and the segmented pipe.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. This application, by setting up a liquid nitrogen protection mechanism, keeps the filling pipe in a low-temperature environment, thereby reducing the ambient temperature of the liquefied natural gas during the filling process, reducing the occurrence of vaporization of the liquefied natural gas, and thus reducing unnecessary vaporization losses during the filling process.

[0030] 2. This application uses a liquid nitrogen protection mechanism to protect the filling pipe with liquid nitrogen. In the event of a leak in the filling pipe, the protective sleeve can prevent liquefied natural gas from leaking into the outside air. At the same time, the liquid nitrogen can neutralize and protect against leaks of liquefied natural gas, preventing the concentration of liquefied natural gas from becoming too high.

[0031] 3. By installing the box and protective sleeve together, this application ensures that liquefied natural gas is kept in a low-temperature environment protected by liquid nitrogen from the liquefied natural gas supply unit to the storage cylinder, thereby reducing unnecessary gasification losses during the liquefied natural gas filling process. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the liquefied natural gas filling machine protection system of Embodiment 1 of this application.

[0033] Figure 2 This is a schematic diagram of the overall structure of the protective sleeve and the inflation tube in Embodiment 1 of this application.

[0034] Figure 3 This is a schematic diagram of the overall structure of the protective box in Embodiment 2 of this application.

[0035] Figure 4 This is a cross-sectional structural diagram of the protective box of Embodiment 2 of this application.

[0036] Figure 5 This is a schematic diagram of the overall structure of the protective sleeve and the inflation tube in Embodiment 3 of this application.

[0037] Figure 6 This is a schematic diagram of the overall structure of the segmented pipe, support, and inflation pipe in Embodiment 3 of this application.

[0038] Figure 7 This is a schematic diagram of the overall structure of the support and inflation tube in Embodiment 3 of this application.

[0039] In the diagram, 1. Liquefied natural gas supply mechanism; 2. Filling pipe; 3. Gas storage cylinder; 4. Exhaust pipe; 5. Natural gas storage mechanism; 6. Mounting box; 61. Insulated cavity; 62. Mounting frame; 63. Top plate; 64. Middle cylinder; 65. Bottom plate; 651. Mounting seat; 66. Lifting drive component; 7. Liquid nitrogen protection mechanism; 71. Liquid nitrogen supply assembly; 72. Nitrogen filling pipe; 73. Protective sleeve; 731. Insulated space; 732. Segmented pipe; 7321. First half-pipe; 7322. Second half-pipe; 733. Support ring; 7331. Support elastic element; 7332. First half-ring; 7333. Second half-ring; 74. Liquid nitrogen return pipe; 75. Liquid nitrogen recovery tank; 76. Vaporizer; 77. Nitrogen storage tank; 78. Nitrogen compressor; 79. Intermediate pipe; 710. Liquid nitrogen recovery pipe; 711. Nitrogen return pipe. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0041] Example 1:

[0042] A gas pretreatment liquefaction filling protection system, referring to Figure 1 The system includes a liquefied natural gas (LNG) supply mechanism 1, a filling pipe 2, a gas storage cylinder 3, an exhaust pipe 4, and a natural gas storage mechanism 5. The filling pipe 2 is located between the LNG supply mechanism 1 and the gas storage cylinder 3. One end of the filling pipe 2 is connected to the LNG supply mechanism 1, and the other end is connected to the gas storage cylinder 3. The filling pipe 2 and the gas storage cylinder 3 are detachably connected. The exhaust pipe 4 is located between the natural gas storage mechanism 5 and the filling pipe 2. One end of the exhaust pipe 4 is connected to the natural gas storage mechanism 5, and the other end is connected to the filling pipe 2. The exhaust pipe 4 and the gas storage cylinder 3 are detachably connected.

[0043] In this embodiment, the liquefied natural gas supply mechanism 1 includes a liquefied natural gas storage tank and a cryogenic liquid pump, which pumps the liquefied natural gas from the storage tank into the filling pipe 2. The natural gas storage mechanism 5 includes a natural gas storage tank, which stores the natural gas discharged from the exhaust pipe 4.

[0044] When gas storage cylinder 3 needs to be filled with liquefied natural gas (LNG), both the filling pipe 2 and the venting pipe 4 are connected to gas storage cylinder 3. The filling pipe 2 is connected to the filling port on gas storage cylinder 3, and the venting pipe 4 is connected to the venting port on gas storage cylinder 3. At this time, the LNG filling mechanism 1 operates, discharging LNG into gas storage cylinder 3 through the filling pipe 2, thus completing the LNG filling process. During this LNG filling process, some LNG is converted into gaseous natural gas. The generation of natural gas causes an increase in pressure inside gas storage cylinder 3. At this time, the natural gas is discharged from gas storage cylinder 3 through the venting pipe 4, which reduces the pressure inside gas storage cylinder 3, thereby ensuring that gas storage cylinder 3 can be filled with a sufficient amount of LNG. The natural gas discharged through the venting pipe 4 is stored in the natural gas storage mechanism 5 for subsequent processing.

[0045] Reference Figure 1 The liquefied natural gas filling and protection system also includes a mounting box 6, within which the gas storage cylinder 3 is housed. Both the filling pipe 2 and the venting pipe 4 extend into the mounting box 6. The mounting box 6 is designed to house the gas storage cylinder 3.

[0046] Reference Figure 1 and Figure 2 The liquefied natural gas (LNG) filling and protection system also includes a liquid nitrogen protection mechanism 7. The liquid nitrogen protection mechanism 7 includes a liquid nitrogen supply component 71, a nitrogen filling pipe 72, and a protective sleeve 73. The protective sleeve 73 is fitted over the outside of the filling pipe 2. One end of the protective sleeve 73 is connected to the LNG supply component 1, and the other end is connected to the side wall of the installation box 6. The inner wall of the protective sleeve 73 is spaced apart from the outer wall of the filling pipe 2. A closed, insulated space 731 is formed between the inner wall of the protective sleeve 73, the outer wall of the filling pipe 2, the side wall of the LNG supply component 1, and the side wall of the installation box 6. The nitrogen filling pipe 72 is positioned between the liquid nitrogen supply component 71 and the protective sleeve 73. One end of the nitrogen filling pipe 72 is connected to the liquid nitrogen supply component 71, and the other end is connected to the protective sleeve 73, thus connecting the nitrogen filling pipe 72 to the insulated space 731.

[0047] In this embodiment, the liquid nitrogen supply assembly 71 includes a liquid nitrogen cryogenic storage tank and a cryogenic liquid pump. Under the action of the cryogenic liquid pump, the liquid nitrogen in the liquid nitrogen cryogenic storage tank is pumped into the nitrogen filling pipe 72, and then the nitrogen filling pipe 72 inputs the liquid nitrogen into the insulated space 731. On the one hand, the low temperature of liquid nitrogen can provide cryogenic protection for the gas filling pipe 2, reducing the vaporization loss of liquefied natural gas in the gas filling pipe 2; on the other hand, in the event of a leak in the gas filling pipe 2, the protective sleeve 73 can prevent the liquefied natural gas from leaking out, and at this time, the liquid nitrogen can provide neutralization protection.

[0048] Reference Figure 1 and Figure 2The liquid nitrogen protection mechanism 7 also includes a liquid nitrogen return pipe 74, one end of which is connected to the protective sleeve 73, and the other end is connected to the mounting box 6. Each side wall of the mounting box 6 has an insulation cavity 61, and these cavities are interconnected. One end of the liquid nitrogen return pipe 74 is connected to the insulation space 731, and the other end is connected to the insulation cavity 61.

[0049] This allows the liquid nitrogen in the insulated space 731 to be transported into the insulated cavity 61 through the liquid nitrogen return pipe 74. After the liquid nitrogen is loaded into the insulated cavity 61, the temperature inside the installation box 6 is reduced, thereby reducing the temperature of the gas storage cylinder 3 and reducing the vaporization loss of liquefied natural gas.

[0050] Reference Figure 1 The liquid nitrogen protection mechanism 7 also includes a liquid nitrogen recovery tank 75, a vaporizer 76, a nitrogen storage tank 77, a nitrogen compressor 78, and several intermediate pipes 79. The liquid nitrogen recovery tank 75, vaporizer 76, nitrogen storage tank 77, and nitrogen compressor 78 are connected sequentially through corresponding intermediate pipes 79. A liquid nitrogen recovery pipe 710 is provided between the liquid nitrogen recovery tank 75 and the installation box 6, with one end connected to the liquid nitrogen recovery tank 75 and the other end connected to the insulation cavity 61. A nitrogen return pipe 711 is provided between the nitrogen compressor 78 and the installation box 6, with one end connected to the nitrogen compressor 78 and the other end connected to the insulation cavity 61.

[0051] Reference Figure 1 The liquid nitrogen recovery tank 75 is designed so that after a period of use, a significant amount of liquid nitrogen in the insulated cavity 61 vaporizes, increasing the internal pressure and reducing the cooling effect of the liquid nitrogen. At this point, the liquid nitrogen recovery pipe 710 opens, introducing liquid nitrogen and nitrogen gas into the liquid nitrogen recovery tank 75 for storage, thus reducing the pressure inside the insulated cavity 61. This serves two purposes: protecting the installation box 6 and achieving liquid nitrogen recovery.

[0052] Reference Figure 1 When the internal pressure of the liquid nitrogen recovery pipe 710 is too high or too much liquid nitrogen is stored, the liquid nitrogen in the insulated cavity 61 can flow into the vaporizer 76. The vaporizer 76 vaporizes the liquid nitrogen into nitrogen gas, which is then stored in the nitrogen storage tank 77. The nitrogen storage tank 77 is designed to vaporize and recover liquid nitrogen when the pressure inside the liquid nitrogen recovery tank 75 is too high, thereby reducing the internal pressure of the liquid nitrogen recovery tank 75.

[0053] Reference Figure 1When it is necessary to stop liquefied natural gas (LNG) filling, the LNG in the insulated cavity 61 needs to be discharged in a timely manner. At this time, nitrogen in the nitrogen storage tank 77 is fed into the nitrogen compressor 78, which pressurizes the nitrogen and feeds it into the insulated cavity 61. This increases the amount of nitrogen in the insulated cavity 61, which allows the liquid nitrogen to be forced into the liquid nitrogen recovery tank 75, thus achieving rapid emptying of the liquid nitrogen in the insulated cavity 61 of the installation box 6.

[0054] In this embodiment, the liquefied natural gas (LNG) filling protection system also includes a control valve assembly and a safety mechanism. The control valve assembly includes several control valves, with each pipeline control valve installed on a different pipeline within the LNG filling protection system. This allows the control valve assembly to control the opening and closing of each pipeline within the LNG filling protection system. The safety mechanism includes several pressure gauges, safety valves, and pressure relief devices, used to monitor the internal pressure of each pipeline and mechanism within the LNG filling protection system. The safety valves and pressure relief valves provide pressure relief protection for each pipeline and mechanism within the LNG filling protection system. The coordination between the control valve assembly and the safety mechanism ensures the normal operation of the LNG filling protection system.

[0055] In this embodiment, both the outer side of the protective sleeve 73 and the outer side of the mounting box 6 are covered with an insulation layer, and the outer side of the insulation layer is also covered with a heat insulation layer. The insulation layer prevents the liquid nitrogen from absorbing heat and vaporizing too quickly, thus extending the service life of the liquid nitrogen. The heat insulation layer prevents workers from being frostbitten if they accidentally touch the low-temperature outer side of the protective sleeve 73 or the outer side of the mounting box 6.

[0056] The implementation principle of this embodiment is as follows: Before filling liquefied natural gas (LNG), the gas storage cylinder 3 is installed inside the installation box 6, and both the filling pipe 2 and the exhaust pipe 4 are connected to the gas storage cylinder 3. The liquid nitrogen protection mechanism 7 is activated, and liquid nitrogen is introduced into the protective sleeve 73 and the installation box 6, allowing the liquid nitrogen to fill the insulation space 731 and the insulation cavity 61 until the temperature inside the filling pipe 2 and the installation box 6 drops to a suitable level. The LNG supply mechanism 1 is activated, and LNG is delivered into the gas storage cylinder 3 through the filling pipe 2. When the pressure inside the gas storage cylinder 3 is too high, the exhaust pipe 4 automatically opens, discharging the vaporized LNG into the gas storage mechanism 5. This allows LNG to be filled into the gas storage cylinder 3.

[0057] Example 2:

[0058] A gas pretreatment liquefaction filling protection system, referring to Figure 3 and Figure 4 The difference between this embodiment and embodiment 1 is that the installation box 6 includes an installation frame 62, a top plate 63, a middle cylinder 64 and a bottom plate 65. The middle cylinder 64 is installed on the installation frame 62 and is vertically arranged. The heat insulation cavity 61 is opened in the side wall of the middle cylinder 64, and the liquid nitrogen return pipe 74, the liquid nitrogen recovery pipe 710 and the nitrogen return pipe 711 are all connected to the middle cylinder 64.

[0059] Reference Figure 3 and Figure 4 The top plate 63 is located on the upper side of the middle cylinder 64 and encloses the middle cylinder 64. The inflation pipe 2 and the exhaust pipe 4 are both connected to the top plate 63. An inflation quick connector is provided on the lower side of the top plate 63. The inflation quick connector is located inside the middle cylinder 64, and the inflation pipe 2 and the exhaust pipe 4 are both connected to the inflation quick connector.

[0060] Reference Figure 3 and Figure 4 A base plate 65 is located at the bottom of the middle cylinder 64 and encloses the middle cylinder 64. A mounting base 651 is provided on the upper side of the base plate 65. The gas cylinder 3 is vertically mounted on the mounting base 651 and is detachably connected to the mounting base 651. Both the mounting base 651 and the gas cylinder 3 are located inside the middle cylinder 64. The upper end of the gas cylinder 3 is inserted into the inflation quick-connect fitting, and at this time, the inflation pipe 2 is inserted into the filling hole on the gas cylinder 3, and the exhaust pipe 4 is inserted into the exhaust hole on the gas cylinder 3.

[0061] In this embodiment, the mounting base 651 has a slot, and the gas storage bottle 3 is inserted into the slot; in addition, the mounting base 651 can also fix the gas storage bottle 3 by a clamping mechanism.

[0062] Reference Figure 3 and Figure 4 A lifting drive component 66 is provided between the base plate 65 and the middle cylinder 64. The lifting drive component 66 adopts a cylinder, a liquefied natural gas cylinder, or a linear push rod. The driving direction of the lifting drive component 66 is set in the vertical direction. The lifting drive component 66 is set on the mounting bracket 62, and the driving end of the lifting drive component 66 is connected to the base plate 65.

[0063] The implementation principle of this application embodiment is as follows: When replacing the gas cylinder 3, the base plate 65 is lowered by the lifting drive 66, the quick-connect filling component and the gas cylinder 3 are separated, and the valve core mechanism on the gas cylinder 3 automatically closes the corresponding filling hole and vent hole. At this time, the filled gas cylinder 3 can be removed from the mounting base 651. Then, the new gas cylinder 3 is installed on the mounting base 651, and then the lifting drive 66 raises the base plate 65 until the base plate 65 closes the middle cylinder 64. At this time, the upper end of the gas cylinder 3 is inserted into the quick-connect filling component, and the filling pipe 2 is inserted into the filling hole on the gas cylinder 3. The filling pipe 2 pushes open the valve core mechanism in the filling hole to realize the connection between the filling hole and the filling pipe 2. Similarly, the vent hole is connected to the vent pipe 4. At this time, the gas cylinder 3 is in place and liquefied natural gas can be filled into the gas cylinder 3.

[0064] Example 3:

[0065] A gas pretreatment liquefaction filling protection system, referring to Figure 1 and Figure 5The difference between this embodiment and Embodiment 1 is that the protective sleeve 73 includes several segmented pipes 732, which are sleeved on the outside of the inflation pipe 2 and are coaxially arranged with the inflation pipe 2. The segmented pipes 732 are arranged sequentially along the length of the inflation pipe 2, and adjacent segmented pipes 732 are connected by flanges. The liquefied natural gas mechanism 1 is connected to adjacent segmented pipes 732 by flanges, and the mounting box 6 is connected to adjacent segmented pipes 732 by flanges. Furthermore, some segmented pipes 732 are connected to the nitrogen filling pipe 72, and some segmented pipes 732 are connected to the liquid nitrogen return pipe 74.

[0066] The structure of the protective sleeve 73 allows for easy adjustment of its length according to the actual length of the inflation tube 2, ensuring that the protective sleeve 73 covers the inflation tube 2 as completely as possible.

[0067] Reference Figure 6 The segmented pipe 732 includes a first half-pipe 7321 and a second half-pipe 7322. The first half-pipe 7321 and the second half-pipe 7322 are coaxially arranged and both are sleeved on the outside of the inflation pipe 2. The first half-pipe 7321 and the second half-pipe 7322 are arranged opposite each other along the corresponding radial direction of the inflation pipe 2. The inner sidewalls of the first half-pipe 7321 and the second half-pipe 7322 are spaced apart from the outer sidewall of the inflation pipe 2. The first half-pipe 7321 and the second half-pipe 7322 form a complete tubular shape. An installation hole is formed between the first half-pipe 7321 and the second half-pipe 7322. The inflation pipe 2 is inserted into the installation hole and the first half-pipe 7321 and the second half-pipe 7322 are connected by bolts.

[0068] The segmented pipe 732 structure facilitates the installation of the protective sleeve 73 to the outside of the inflation pipe 2.

[0069] Reference Figure 6 and Figure 7 The protective sleeve 73 also includes a support ring 733. The inner wall of the support ring 733 is provided with a plurality of support elastic elements 7331. The plurality of support elastic elements 7331 are all fixedly connected to the inner wall of the support ring 733. The plurality of support elastic elements 7331 are arranged sequentially at intervals along the circumference of the support ring 733. A clearance hole is formed between the plurality of support rings 733.

[0070] In this embodiment, the supporting elastic element 7331 is a ring-shaped and elastic metal strip. Alternatively, the supporting elastic element 7331 can also be a spring.

[0071] Reference Figure 6 and Figure 7Each segment of the pipe 732 is fitted with a support ring 733, which is coaxially arranged with the segment of the pipe 732. The support ring 733 is located between the inner wall of the segment of the pipe 732 and the outer wall of the inflation pipe 2, and the inflation pipe 2 is inserted into the clearance hole. Several supporting elastic elements 7331 abut against the side wall of the inflation pipe 2. The structure of the support ring 733 provides stable support for the inflation pipe 2.

[0072] Reference Figure 6 and Figure 7 The support ring 733 includes a first half-ring 7332 and a second half-ring 7333. A plurality of supporting elastic elements 7331 are respectively disposed on the inner sidewalls of the first half-ring 7332 and the second half-ring 7333. The first half-ring 7332 and the second half-ring 7333 are connected by bolts, and the connection of the first half-ring 7332 and the second half-ring 7333 forms a complete ring. This structural design of the support ring 733 facilitates its installation onto the outside of the inflation pipe 2 and also facilitates its insertion into the installed segmented pipe 732.

[0073] The implementation principle of this application embodiment is as follows: After the air pipe 2 is installed, all segmented pipes 732 are installed sequentially along the length of the air pipe 2. After each segmented pipe 732 is installed, a support ring 733 is installed between the corresponding segmented pipe 732 and the air pipe 2. This enables the installation of the segmented pipes 732 and provides stable support for the air pipe 2, thereby improving the stability of the insulation space 731 between the protective sleeve 73 and the air pipe 2.

[0074] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gas pretreatment liquefaction filling protection system, characterized in that, include: A liquefied natural gas supply facility (1) is used to supply liquefied natural gas; Gas storage cylinder (3) is used for dispensing liquefied natural gas; The gas filling pipe (2) has one end connected to the liquefied natural gas supply mechanism (1) and the other end connected to the gas storage cylinder (3), and the gas filling pipe (2) and the gas storage cylinder (3) are detachably connected. An exhaust pipe (4) is provided, one end of which is connected to the gas storage cylinder (3), and the exhaust pipe (4) is detachably connected to the gas storage cylinder (3). Liquid nitrogen protection mechanism (7), the liquid nitrogen protection mechanism (7) includes a liquid nitrogen supply component (71) and a protective sleeve (73), the protective sleeve (73) is sleeved on the outside of the gas filling pipe (2), the inner side wall of the protective sleeve (73) is spaced apart from the outer side wall of the gas filling pipe (2), and the protective sleeve (73) is connected to the liquid nitrogen supply component (71); The gas cylinder (3) is located inside the installation box (6), where the inflation pipe (2) and the exhaust pipe (4) both extend into the installation box (6); The installation box (6) has an insulated cavity (61) inside its side wall. A liquid nitrogen return pipe (74) is provided between the installation box (6) and the liquid nitrogen supply assembly (71). One end of the liquid nitrogen return pipe (74) is connected to the liquid nitrogen supply assembly (71), and the other end is connected to the insulated cavity (61). The mounting box (6) includes a mounting frame (62) and a middle cylinder (64). The middle cylinder (64) is vertically arranged, and the mounting frame (62) is fixedly connected to the middle cylinder (64). The heat-insulating cavity (61) is opened inside the side wall of the middle cylinder (64). A top plate (63) is provided on the upper side of the middle cylinder (64), the top plate (63) closes the middle cylinder (64), the inflation pipe (2) and the exhaust pipe (4) are both connected to the top plate (63), and the inflation pipe (2) and the exhaust pipe (4) both extend into the middle cylinder (64); A bottom plate (65) is provided on the lower side of the middle cylinder (64), and a lifting drive component (66) for driving the bottom plate (65) to move in the vertical direction is provided between the middle cylinder (64) and the bottom plate (65). The gas cylinder (3) is vertically mounted on the upper side of the base plate (65). The gas cylinder (3) is detachably connected to the base plate (65). The gas cylinder (3) is inserted into the middle cylinder (64). The inflation pipe (2) and the exhaust pipe (4) are both inserted into the gas cylinder (3) in the vertical direction.

2. The gas pretreatment liquefaction filling protection system according to claim 1, characterized in that, The liquid nitrogen protection mechanism (7) also includes a liquid nitrogen recovery tank (75), and a liquid nitrogen recovery pipe (710) is provided between the liquid nitrogen recovery tank (75) and the installation box (6). One end of the liquid nitrogen recovery pipe (710) is connected to the liquid nitrogen recovery tank (75), and the other end is connected to the heat-insulating cavity (61).

3. The gas pretreatment liquefaction filling protection system according to claim 2, characterized in that, The liquid nitrogen protection mechanism (7) also includes a vaporizer (76), a nitrogen storage tank (77), and a nitrogen compressor (78), and the liquid nitrogen recovery tank (75), vaporizer (76), nitrogen storage tank (77), and nitrogen compressor (78) are connected in sequence; A nitrogen return pipe (711) is provided between the nitrogen compressor (78) and the mounting box (6). One end of the nitrogen return pipe (711) is connected to the nitrogen compressor (78), and the other end is connected to the heat-insulating cavity (61).

4. The gas pretreatment liquefaction filling protection system according to claim 1, characterized in that, The protective sleeve (73) is covered with a heat insulation layer on the outside, and a heat insulation layer is covered with a heat insulation layer on the outside of the heat insulation layer.

5. The gas pretreatment liquefaction filling protection system according to claim 1, characterized in that, The protective sleeve (73) includes several segmented pipes (732), which are sleeved on the outside of the inflation pipe (2). The segmented pipes (732) are arranged sequentially along the length of the inflation pipe (2), and two adjacent inflation pipes (2) are detachably connected.

6. The gas pretreatment liquefaction filling protection system according to claim 5, characterized in that, A support ring (733) is inserted into the segmented pipe (732). The support ring (733) is sleeved on the outside of the air-filled pipe (2). A plurality of support elastic elements (7331) are provided on the inner side wall of the support ring (733). The plurality of support elastic elements (7331) are arranged sequentially at intervals along the circumference of the support ring (733). All support elastic elements (7331) abut against the outer side wall of the air-filled pipe (2).

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