Gas pretreatment liquefaction filling protection system

Abstract

The invention relates to a gas pretreatment liquefaction filling protection system, and relates to the technical field of liquefied natural gas filling equipment.The filling protection system comprises a liquefied natural gas supply mechanism used for supplying liquefied natural gas; the gas storage bottle is used for subpackaging liquefied natural gas; one end of the gas filling pipe is communicated with the liquefied natural gas supply mechanism, the other end of the gas filling pipe is communicated with the gas storage bottle, and the gas filling pipe is detachably connected with the gas storage bottle; one end of the exhaust pipe is communicated with the gas storage bottle, and the exhaust pipe is detachably connected with the gas storage bottle; the liquid nitrogen protection mechanism comprises a liquid nitrogen supply assembly and a protection sleeve, the protection sleeve is arranged on the outer side of the gas filling pipe in a sleeving mode, the inner side wall of the protection sleeve and the outer side wall of the gas filling pipe are arranged in a spaced mode, and the protection sleeve communicates with the liquid nitrogen supply assembly. Through the arrangement of the liquid nitrogen protection mechanism, the temperature of the environment where the liquefied natural gas is located can be reduced, and unnecessary gasification loss in the liquefied natural gas filling process is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of liquefied natural gas filling equipment, and in particular to a gas pre-treatment liquefaction filling protection system. Background Art

[0002] A liquefied natural gas filling machine is a device used to fill liquefied natural gas from a liquefied natural gas storage tank into a gas cylinder or other container.

[0003] At present, the LNG filling machine includes a LNG cryogenic storage tank, a cryogenic liquid pump, a filling pipeline, a gas storage cylinder and a pressure relief pipeline.

[0004] Among them, the gas cylinder is used to pack liquefied natural gas. Common gas cylinders mainly include an insulation tank, a valve body and a gas supply pipe. The valve body is set at the tank mouth of the insulation tank. The valve body is provided with a filling hole, an exhaust hole and a gas supply channel. The filling hole and the exhaust hole vertically penetrate the valve body. The filling hole and the exhaust hole are provided with a valve core mechanism. The valve core mechanism is used to control the automatic opening and closing of the corresponding filling hole or exhaust hole. The gas supply pipe is connected to the gas supply pipeline. The gas supply channel realizes the discharge of natural gas and the use of natural gas in the gas cylinder. The filling hole realizes the filling of liquefied natural gas, and the exhaust hole realizes the discharge of gasified liquefied natural gas.

[0005] When using a liquefied natural gas filling machine to fill a gas cylinder, install the gas cylinder into the liquefied natural gas filling machine, connect the filling pipeline and the pressure relief pipeline to the valve body on the gas cylinder, so that the filling pipeline pushes open the valve core mechanism in the filling hole to achieve the connection between the filling pipeline and the filling hole; similarly, the pressure relief pipeline is connected to the exhaust hole. The liquefied natural gas in the liquefied natural gas cryogenic storage tank is discharged by a cryogenic liquid pump, and the liquefied natural gas is input into the gas cylinder through the filling pipeline. At this time, part of the liquefied natural gas will be gasified due to pressure drop or temperature increase. The liquefied natural gas will be gasified into gaseous natural gas, which will cause the pressure in the gas cylinder to increase. When the pressure in the gas cylinder is too high, the natural gas will be discharged through the exhaust hole and the pressure relief pipeline.

[0006] Regarding the above-mentioned related technologies, when liquefied natural gas is filled, the liquefied natural gas flows in the filling pipeline, and the liquefied natural gas absorbs heat from the surrounding environment, causing the temperature of the liquefied natural gas to rise, thereby causing part of the liquefied natural gas to vaporize, thereby causing unnecessary vaporization losses. Summary of the invention

[0007] The present application provides a gas pretreatment liquefaction filling protection system, the purpose of which is to reduce the ambient temperature of the liquefied natural gas when using a liquefied natural gas filling machine to fill the liquefied natural gas, reduce the gasification of the liquefied natural gas, and thus reduce unnecessary gasification 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: A gas pretreatment liquefaction filling protection system comprises a liquefied natural gas supply mechanism for supplying liquefied natural gas; a gas storage cylinder for dispensing liquefied natural gas; a gas filling pipe, one end of which is connected to the liquefied natural gas supply mechanism and the other end of which is connected to the gas storage cylinder, and the gas filling pipe is detachably connected to the gas storage cylinder; an exhaust pipe, one end of which is connected to the gas storage cylinder and the exhaust pipe is detachably connected to the gas storage cylinder; a liquid nitrogen protection mechanism, the liquid nitrogen protection mechanism comprises a liquid nitrogen supply assembly and a protection sleeve, the protection sleeve is sleeved on the outside of the gas filling pipe, the inner side wall of the protection sleeve is spaced apart from the outer side wall of the gas filling pipe, and the protection sleeve is connected to the liquid nitrogen supply assembly.

[0009] By adopting the above technical scheme, the liquefied natural gas supply mechanism, the gas cylinder, the charging pipe and the exhaust pipe are arranged in coordination. When the liquefied natural gas is filled, the charging pipe is connected to the charging hole on the gas cylinder, and the exhaust pipe is connected to the exhaust hole on the gas cylinder. At this time, the liquefied natural gas supply mechanism works to discharge the liquefied natural gas into the gas cylinder through the charging pipe to realize the filling of the liquefied natural gas. During the filling process of the liquefied natural gas, part of the liquefied natural gas suffers from gasification loss, resulting in part of the liquefied natural gas being converted into gaseous natural gas. The generation of natural gas causes the pressure in the gas cylinder to increase. At this time, the natural gas is discharged from the gas cylinder through the exhaust pipe, which can ensure the pressure in the gas cylinder, and then ensure that a sufficient amount of liquefied natural gas can be loaded into the gas cylinder.

[0010] The liquid nitrogen protection mechanism is configured by cooperating with the liquid nitrogen supply component and the protection sleeve. Before the liquefied natural gas is filled, the liquid nitrogen supply component works to introduce liquefied natural gas into the protection sleeve, so that the liquid nitrogen is input between the inner wall of the protection sleeve and the outer wall of the inflation pipe. At this time, the liquid nitrogen can provide low-temperature protection for the inflation pipe, so that the inflation pipe is in a low-temperature environment, thereby reducing the amount of heat that the liquefied natural gas can absorb, reducing the gasification of the liquefied natural gas, and thus reducing unnecessary gasification losses.

[0011] Optionally, an installation box is further included, the inflation pipe and the exhaust pipe both extend into the installation box, and the gas storage bottle is arranged in the installation box.

[0012] By adopting the above technical solution, the installation box is set up so that the inflation pipe and the exhaust pipe both extend into the installation box, and the gas storage cylinder is also set in the installation box. The installation box is set up to realize the installation of the gas storage cylinder, reduce the impact of the external environment on the filling process, and ensure the stability of the filling process.

[0013] Optionally, a heat-insulating cavity is opened in the side wall of the installation box, and a liquid nitrogen return pipe is arranged between the installation box and the liquid nitrogen supply assembly, one end of the liquid nitrogen return pipe is connected to the liquid nitrogen supply assembly, and the other end is connected to the heat-insulating cavity.

[0014] By adopting the above technical solution, the insulation cavity is opened and the liquid nitrogen return pipe is set, liquid nitrogen can be introduced into the insulation cavity of the installation box, thereby reducing the temperature inside the installation box, that is, reducing the temperature of the environment in which the gas storage cylinder is located, thereby further reducing the gasification loss of liquefied natural gas.

[0015] Optionally, the liquid nitrogen protection mechanism further includes a liquid nitrogen recovery tank, 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.

[0016] By adopting the above technical solution, the liquid nitrogen recovery pipe and the liquid nitrogen recovery tank are arranged, so that when the liquid nitrogen in the heat preservation cavity needs to be recovered, the liquid nitrogen in the heat preservation cavity can be recovered into the liquid nitrogen recovery tank.

[0017] Optionally, the liquid nitrogen protection mechanism also includes a vaporizer, a nitrogen storage tank and a nitrogen compressor, and the liquid nitrogen recovery tank, vaporizer, nitrogen storage tank and nitrogen compressor are connected in sequence; a nitrogen return pipe is arranged 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.

[0018] By adopting the above technical solution, the vaporizer can gasify liquid nitrogen into nitrogen, the nitrogen storage tank is used to store the vaporized nitrogen, and the nitrogen compressor can pressurize the nitrogen and send it back to the insulation cavity through the nitrogen return pipe. At this time, the nitrogen in the gaseous state can increase the pressure in the insulation cavity. Under the action of the high-pressure nitrogen in the insulation cavity, the liquid nitrogen can quickly flow into the liquid nitrogen recovery tank through the liquid nitrogen recovery pipe, thereby realizing the rapid recovery of liquid nitrogen.

[0019] Optionally, the installation box includes a mounting frame and a middle tube, the middle tube is vertically arranged, the mounting frame is fixedly connected to the middle tube, and the heat-insulating cavity is opened in the side wall of the middle tube; a top plate is arranged on the upper side of the middle tube, the top plate closes the middle tube, the inflation tube and the exhaust pipe are both connected to the top plate, and the inflation tube and the exhaust pipe both extend into the middle tube; a bottom plate is arranged on the lower side of the middle tube, and a lifting drive member for driving the bottom plate to move in a vertical direction is arranged between the middle tube and the bottom plate; the gas cylinder is vertically arranged on the upper side of the bottom plate, the gas cylinder is detachably connected to the bottom plate, the gas cylinder is plug-fitted with the middle tube, and the inflation tube and the exhaust pipe are both plug-fitted with the gas cylinder in the vertical direction.

[0020] By adopting the above technical solution, the setting of the mounting frame provides stable installation for the top plate, the middle tube, the bottom plate and the lifting drive. The setting of the top plate closes the middle tube and provides stable support for the inflation tube and the exhaust tube. The setting of the bottom plate is used to install the gas cylinder, and then with the cooperation of the lifting drive, the gas cylinder can be quickly installed in the middle tube. Such a structural setting can automatically remove the gas cylinder from the installation box and automatically send the gas cylinder into the installation box when the gas cylinder needs to be replaced, reducing the possibility of workers directly contacting the middle tube, which can reduce the possibility of workers being frostbitten by liquid nitrogen in the insulation cavity.

[0021] Optionally, the outer side of the protective sleeve is covered with a heat preservation layer, and the outer side of the heat preservation layer is covered with a thermal insulation layer.

[0022] By adopting the above technical solution, the setting of the insulation layer can effectively isolate the heat from the external environment, maintain the low temperature state in the protective sleeve, and reduce the gasification of liquefied natural gas. The setting of the insulation layer further isolates the heat from the external environment, improves the thermal isolation effect, and at the same time, can prevent workers from accidentally touching the insulation sleeve and getting frostbite.

[0023] Optionally, the protective sleeve includes a plurality of segmented pipes, the segmented pipes are sleeved on the outside of the inflation pipe, the plurality of segmented pipes are arranged in sequence along the length direction of the inflation pipe, and two adjacent inflation pipes are detachably connected.

[0024] By adopting the above technical solution, the protective sleeve is designed with several segmented pipes, so that the protective sleeve can be adjusted according to the actual length of the inflation tube, thereby improving the adaptability of the protective sleeve.

[0025] Optionally, a support ring is inserted into the segmented pipe, and the support ring is sleeved on the outside of the inflation tube. A plurality of support elastic members are provided on the inner wall of the support ring. The plurality of support elastic members are arranged in sequence at intervals along the circumference of the support ring, and the support elastic members all contact with the outer wall of the inflation tube.

[0026] By adopting the above technical solution, the setting of the support ring and the support elastic member provides stable support for the inflation tube, reduces the displacement and vibration of the inflation tube during the filling process, improves the stability of the installation of the inflation tube, and at the same time improves the stability of the interval space between the inflation tube and the segmented pipeline.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application sets a liquid nitrogen protection mechanism so that the filling pipe is in a low-temperature environment, thereby reducing the ambient temperature of the liquefied natural gas during the filling process of the liquefied natural gas, reducing the gasification of the liquefied natural gas, and thus reducing unnecessary gasification losses during the filling process of the liquefied natural gas.

[0028] 2. The present application can protect the inflation pipe with liquid nitrogen through a liquid nitrogen protection mechanism, and when the inflation pipe leaks, the protective sleeve can prevent the liquefied natural gas from leaking into the external air. At the same time, the liquid nitrogen can neutralize the leakage of the liquefied natural gas and prevent the concentration of the liquefied natural gas from being too high.

[0029] 3. The present application uses the coordinated arrangement of the installation box and the protective sleeve to ensure that the liquefied natural gas is always in a low-temperature environment protected by liquid nitrogen during the process from the liquefied natural gas supply mechanism to the gas storage cylinder, thereby reducing unnecessary gasification losses during the liquefied natural gas filling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the liquefied natural gas filling machine protection system of Example 1 of the present application.

[0031] Figure 2 It is a schematic diagram of the overall structure of the protective sleeve and the inflation tube of Example 1 of the present application.

[0032] Figure 3 It is a schematic diagram of the overall structure of the protection box of Example 2 of the present application.

[0033] Figure 4 It is a schematic diagram of the cross-sectional structure of the protection box of Example 2 of the present application.

[0034] Figure 5 It is a schematic diagram of the overall structure of the protective sleeve and the inflation tube of Example 3 of the present application.

[0035] Figure 6 It is a schematic diagram of the overall structure of the segmented pipeline, support member and inflation tube of Example 3 of the present application.

[0036] Figure 7 It is a schematic diagram of the overall structure of the support member and the inflation tube of Example 3 of the present application.

[0037] In the figure, 1, liquefied natural gas supply mechanism; 2, charging pipe; 3, gas storage bottle; 4, exhaust pipe; 5, natural gas storage mechanism; 6, installation box; 61, insulation cavity; 62, installation frame; 63, top plate; 64, middle tube; 65, bottom plate; 651, mounting seat; 66, lifting drive member; 7, liquid nitrogen protection mechanism; 71, liquid nitrogen supply assembly; 72, nitrogen charging pipeline; 73, protection sleeve; 731, insulation space; 732, segmented pipeline; 7321, first half pipe; 7322, second half pipe; 733, support ring; 7331, support elastic member; 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 DESCRIPTION

[0038] The following is combined with Figure 1 -Attached Figure 7 , further details of this application are given.

[0039] Embodiment 1: A gas pretreatment liquefaction filling protection system, referring to Figure 1 , including a liquefied natural gas supply mechanism 1, a gas charging pipe 2, a gas storage bottle 3, an exhaust pipe 4 and a natural gas storage mechanism 5, wherein the gas charging pipe 2 is arranged between the liquefied natural gas supply mechanism 1 and the gas storage bottle 3, one end of the gas charging pipe 2 is connected to the liquefied natural gas supply mechanism 1, and the other end is connected to the gas storage bottle 3, and the gas charging pipe 2 and the gas storage bottle 3 are detachably connected. The exhaust pipe 4 is located between the natural gas storage mechanism 5 and the gas charging 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 gas charging pipe 2, and the exhaust pipe 4 and the gas storage bottle 3 are detachably connected.

[0040] In this embodiment, the liquefied natural gas supply mechanism 1 includes a liquefied natural gas storage tank and a cryogenic liquid pump, which can pump the liquefied natural gas in the liquefied natural gas storage tank into the gas charging pipe 2. The natural gas storage mechanism 5 includes a natural gas storage tank, which can store the natural gas discharged from the exhaust pipe 4.

[0041] When the gas cylinder 3 needs to be filled with liquefied natural gas, the filling pipe 2 and the exhaust pipe 4 are both connected to the gas cylinder 3, the filling pipe 2 is connected to the filling hole on the gas cylinder 3, and the exhaust pipe 4 is connected to the exhaust hole on the gas cylinder 3. At this time, the liquefied natural gas supply mechanism 1 works, and the liquefied natural gas is discharged into the gas cylinder 3 through the filling pipe 2 to achieve the filling of liquefied natural gas. During this liquefied natural gas filling process, part of the liquefied natural gas is converted into gaseous natural gas. The production of natural gas causes the pressure in the gas cylinder 3 to increase. At this time, the natural gas is discharged from the gas cylinder 3 through the exhaust pipe 4, which can reduce the pressure in the gas cylinder 3, thereby ensuring that a sufficient amount of liquefied natural gas can be loaded into the gas cylinder 3. The natural gas discharged through the exhaust pipe 4 will be stored in the natural gas storage mechanism 5 for subsequent processing.

[0042] Reference Figure 1 The liquefied natural gas filling protection system further includes an installation box 6, in which the gas cylinder 3 is arranged. The gas filling pipe 2 and the exhaust pipe 4 both extend into the installation box 6. The installation box 6 is provided for installing the gas cylinder 3.

[0043] Reference Figure 1 and Figure 2The liquefied natural gas filling protection system also includes a liquid nitrogen protection mechanism 7, which includes a liquid nitrogen supply component 71, a nitrogen filling pipeline 72 and a protective sleeve 73. The protective sleeve 73 is sleeved on the outside of the gas filling pipe 2, one end of the protective sleeve 73 is connected to the liquefied natural gas supply mechanism 1, and the other end of the protective sleeve 73 is connected to the side wall of the installation box 6. The inner side wall of the protective sleeve 73 is spaced apart from the outer side wall of the gas filling pipe 2. A closed heat preservation space 731 is formed around the inner side wall of the protective sleeve 73, the outer side wall of the gas filling pipe 2, the side wall of the liquefied natural gas supply mechanism 1 and the side wall of the installation box 6. The nitrogen filling pipeline 72 is arranged between the liquid nitrogen supply component 71 and the protective sleeve 73. One end of the nitrogen filling pipeline 72 is connected to the liquid nitrogen supply component 71, and the other end is connected to the protective sleeve 73, which makes the nitrogen filling pipeline 72 connected to the heat preservation space 731.

[0044] 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 heat preservation space 731. On the one hand, the liquid nitrogen has a low temperature, which can provide low-temperature protection for the gas filling pipe 2 and reduce the gasification loss of the liquefied natural gas in the gas filling pipe 2; on the other hand, when the gas filling pipe 2 leaks, the protective sleeve 73 can prevent the liquefied natural gas from leaking, and at this time, the liquid nitrogen can be neutralized and protected.

[0045] Reference Figure 1 and Figure 2 The liquid nitrogen protection mechanism 7 further includes a liquid nitrogen return pipe 74, one end of which is connected to the protection sleeve 73, and the other end is connected to the installation box 6. The side walls of the installation box 6 are provided with insulation cavities 61, and the plurality of insulation cavities 61 are connected, and 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.

[0046] This allows the liquid nitrogen in the insulation space 731 to be transported into the insulation cavity 61 through the liquid nitrogen return pipe 74. After the liquid nitrogen is filled into the insulation cavity 61, the temperature in the installation box 6 is reduced, thereby reducing the temperature of the gas storage cylinder 3 and reducing the gasification loss of the liquefied natural gas.

[0047] Reference Figure 1The 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 a plurality of intermediate pipes 79. The liquid nitrogen recovery tank 75, the vaporizer 76, the nitrogen storage tank 77 and the nitrogen compressor 78 are connected in sequence through the corresponding intermediate pipes 79. 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 preservation cavity 61. A nitrogen return pipe 711 is provided between the nitrogen compressor 78 and the installation 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 preservation cavity 61.

[0048] Reference Figure 1 , the setting of the liquid nitrogen recovery tank 75, after the liquid nitrogen in the heat preservation cavity 61 is used for a period of time, more liquid nitrogen is gasified, the internal pressure of the heat preservation cavity 61 increases, and the cooling effect of the liquid nitrogen is reduced. At this time, the liquid nitrogen recovery pipe 710 is opened, and the liquid nitrogen and nitrogen gas are input into the liquid nitrogen recovery tank 75 for storage, so that the pressure in the heat preservation cavity 61 is reduced. On the one hand, the installation box 6 is protected; on the other hand, the recovery of liquid nitrogen is realized.

[0049] 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 heat preservation cavity 61 can flow into the vaporizer 76, and the vaporizer 76 gasifies the liquid nitrogen into nitrogen gas, and the nitrogen gas is input into the nitrogen storage tank 77 for storage. The setting of the nitrogen storage tank 77 can gasify and recover the liquid nitrogen when the pressure in the liquid nitrogen recovery tank 75 is too high, thereby reducing the internal pressure of the liquid nitrogen recovery tank 75.

[0050] Reference Figure 1 When it is necessary to stop filling the liquefied natural gas, the liquefied natural gas in the heat preservation cavity 61 needs to be discharged in time. At this time, the nitrogen in the nitrogen storage tank 77 is input into the nitrogen compressor 78, and the nitrogen compressor 78 pressurizes the nitrogen and inputs it into the heat preservation cavity 61. At this time, the nitrogen in the heat preservation cavity 61 increases, which can pressurize the liquid nitrogen into the liquid nitrogen recovery tank 75, so as to realize the rapid emptying of the liquid nitrogen in the heat preservation cavity 61 in the installation box 6.

[0051] In this embodiment, the liquefied natural gas filling protection system also includes a control valve group and a safety mechanism. The control valve group includes a plurality of control valves. The plurality of pipeline control valves are respectively arranged on each pipeline of the liquefied natural gas filling protection system, so that the control valve group can control the opening or closing of each pipeline in the liquefied natural gas filling protection system. The safety mechanism includes a plurality of pressure gauges, a safety valve and a pressure relief device, which are used to monitor the internal pressure of each pipeline and mechanism in the liquefied natural gas filling protection system. The safety valve and the pressure relief valve are used to realize the pressure relief protection of each pipeline and mechanism in the liquefied natural gas filling protection system. Therefore, the coordination of the control valve group and the safety mechanism enables the liquefied natural gas filling protection system to work normally.

[0052] In this embodiment, the outer side of the protective sleeve 73 and the outer side of the installation box 6 are covered with a heat preservation layer, and the outer side of the heat preservation layer is also covered with a heat insulation layer. The provision of the heat preservation layer can prevent the liquid nitrogen from absorbing heat and gasifying too quickly, thereby extending the use time of the liquid nitrogen. The provision of the heat insulation layer can prevent the worker from being frostbitten when the worker accidentally touches the outer side of the low-temperature protective sleeve 73 or the outer side of the installation box 6.

[0053] The implementation principle of the embodiment of the present application is as follows: before filling the liquefied natural gas, install the gas cylinder 3 into the installation box 6, and connect the gas charging pipe 2 and the exhaust pipe 4 to the gas cylinder 3. Start the liquid nitrogen protection mechanism 7, and introduce liquid nitrogen into the protection sleeve 73 and the installation box 6, so that the liquid nitrogen is filled into the insulation space 731 and the insulation cavity 61 until the temperature in the gas charging pipe 2 and the installation box 6 drops to a suitable temperature. Start the liquefied natural gas supply mechanism 1, and the liquefied natural gas is transported into the gas cylinder 3 through the gas charging pipe 2. When the pressure in the gas cylinder 3 is too high, the exhaust pipe 4 automatically opens to discharge the gasified liquefied natural gas into the natural gas storage mechanism 5. This enables the liquefied natural gas to be filled into the gas cylinder 3.

[0054] Embodiment 2: 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 a mounting frame 62, a top plate 63, a middle tube 64 and a bottom plate 65, the middle tube 64 is installed on the mounting frame 62, the middle tube 64 is vertically arranged, the insulation cavity 61 is opened in the side wall of the middle tube 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 tube 64.

[0055] Reference Figure 3 and Figure 4 The top plate 63 is arranged on the upper side of the middle tube 64, and the top plate 63 closes the middle tube 64, and the inflation tube 2 and the exhaust tube 4 are both connected to the top plate 63. An inflation quick connector is arranged on the lower side of the top plate 63, and the inflation quick connector is located in the middle tube 64, and the inflation tube 2 and the exhaust tube 4 are both connected to the inflation quick connector.

[0056] Reference Figure 3 and Figure 4 The bottom plate 65 is arranged at the bottom of the middle cylinder 64, and the bottom plate 65 closes the middle cylinder 64. A mounting seat 651 is arranged on the upper side of the bottom plate 65. The gas cylinder 3 is vertically arranged on the mounting seat 651, and the gas cylinder 3 is detachably connected to the mounting seat 651. The mounting seat 651 and the gas cylinder 3 are both located in the middle cylinder 64. The upper end of the gas cylinder 3 is plugged with the charging fast connector, and at this time, the charging pipe 2 is plugged with the charging hole on the gas cylinder 3, and the exhaust pipe 4 is plugged with the exhaust hole on the gas cylinder 3.

[0057] In this embodiment, a slot is provided on the mounting seat 651, and the gas cylinder 3 is plugged into the slot; in addition, the mounting seat 651 can also fix the gas cylinder 3 through a clamping mechanism.

[0058] Reference Figure 3 and Figure 4 A lifting drive member 66 is arranged between the bottom plate 65 and the middle cylinder 64. The lifting drive member 66 adopts a cylinder or a liquefied natural gas cylinder or a linear push rod. The driving direction of the lifting drive member 66 is arranged in the vertical direction. The lifting drive member 66 is arranged on the mounting frame 62, and the driving end of the lifting drive member 66 is connected to the bottom plate 65.

[0059] The implementation principle of the embodiment of the present application is as follows: when replacing the gas cylinder 3, the bottom plate 65 is lowered by the lifting drive 66, the quick-connect gas filling piece and the gas cylinder 3 are separated, and the valve core mechanism on the gas cylinder 3 automatically closes the corresponding filling hole and exhaust hole, and the filled gas cylinder 3 can be removed from the mounting seat 651. Then the new gas cylinder 3 is installed on the mounting seat 651, and then the lifting drive 66 raises the bottom plate 65 until the bottom plate 65 closes the middle cylinder 64, at which time the upper end of the gas cylinder 3 is plugged with the quick-connect gas filling piece, the gas filling pipe 2 is plugged with the filling hole on the gas cylinder 3, and the gas filling pipe 2 pushes open the valve core mechanism in the punching hole to achieve the connection between the filling hole and the gas filling pipe 2, and similarly, the exhaust hole is connected with the exhaust pipe 4, at which time the gas cylinder 3 is in place, and liquefied natural gas can be filled into the gas cylinder 3.

[0060] Embodiment 3: A gas pretreatment liquefaction filling protection system, referring to Figure 1 and Figure 5 The difference between this embodiment and embodiment 1 is that the protective sleeve 73 includes a plurality of segmented pipes 732, which are sleeved on the outside of the gas charging pipe 2, and the segmented pipes 732 are coaxially arranged with the gas charging pipe 2, and the plurality of segmented pipes 732 are arranged in sequence along the length direction of the gas charging pipe 2, and two adjacent segmented pipes 732 are connected by flanges, the liquefied natural gas supply mechanism 1 is connected to the adjacent segmented pipes 732 by flanges, and the installation box 6 is connected to the adjacent segmented pipes 732 by flanges. In addition, there is a segmented pipe 732 connected to the nitrogen charging pipe 72, and there is a segmented pipe 732 connected to the liquid nitrogen return pipe 74.

[0061] The structural setting of the protection sleeve 73 facilitates adjusting the length of the protection sleeve 73 according to the actual length of the inflation tube 2, so that the protection sleeve 73 can cover the inflation tube 2 as completely as possible.

[0062] Reference Figure 6The segmented pipe 732 includes a first half pipe 7321 and a second half pipe 7322, which are coaxially arranged, and are both sleeved on the outside of the air-filled pipe 2, and are oppositely arranged along the radial direction corresponding to the air-filled pipe 2, and the inner walls of the first half pipe 7321 and the second half pipe 7322 are spaced from the outer wall of the air-filled pipe 2, and the first half pipe 7321 and the second half pipe 7322 form a complete tubular shape, and a mounting hole is formed between the first half pipe 7321 and the second half pipe 7322, and the air-filled pipe 2 is plugged into the mounting hole, and the first half pipe 7321 and the second half pipe 7322 are connected by bolts.

[0063] The structural setting of the segmented pipeline 732 facilitates the installation of the protective sleeve 73 to the outside of the inflation pipe 2.

[0064] Reference Figure 6 and Figure 7 The protective sleeve 73 also includes a support ring 733, and a plurality of support elastic members 7331 are arranged on the inner wall of the support ring 733. The plurality of support elastic members 7331 are fixedly connected to the inner wall of the support ring 733, and the plurality of support elastic members 7331 are arranged in sequence along the circumference of the support ring 733, and clearance holes are formed between the plurality of support rings 733.

[0065] In this embodiment, the supporting elastic member 7331 is a ring-shaped and elastic metal strip. In addition, the supporting elastic member 7331 can also be a spring.

[0066] Reference Figure 6 and Figure 7 The segmented pipes 732 are all plugged with support rings 733, and the support rings 733 are coaxially arranged with the segmented pipes 732. The support rings 733 are located between the inner wall of the segmented pipes 732 and the outer wall of the inflatable pipe 2, and the inflatable pipe 2 is plugged and matched with the clearance hole, and the plurality of support elastic members 7331 are all in contact with the side wall of the inflatable pipe 2. The structural setting of the support ring 733 can provide stable support for the inflatable pipe 2.

[0067] Reference Figure 6 and Figure 7 The support ring 733 includes a first half ring 7332 and a second half ring 7333, and a plurality of support elastic members 7331 are respectively arranged on the inner side wall of the first half ring 7332 and the inner side wall of the second half ring 7333. The first half ring 7332 and the second half ring 7333 are connected by bolts, and the first half ring 7332 and the second half ring 7333 are connected to form a complete ring shape. The structural setting of the support ring 733 makes it easy to install the support ring 733 on the outside of the inflation tube 2, and also to insert the support ring 733 into the installed segmented pipe 732.

[0068] The implementation principle of the embodiment of the present application is: after the installation of the inflation tube 2 is completed, all the segmented pipes 732 are installed in sequence along the length direction of the inflation tube 2, and after each segmented pipe 732 is installed, a support ring 733 is installed between the corresponding segmented pipe 732 and the inflation tube 2. This can realize the installation of the segmented pipe 732 and provide stable support for the inflation tube 2, thereby improving the stability of the insulation space 731 between the protective sleeve 73 and the inflation tube 2.

[0069] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gas pretreatment liquefaction filling protection system, characterized in that: include: A liquefied natural gas supply mechanism (1) for supplying liquefied natural gas; Gas storage cylinder (3), used for packaging liquefied natural gas; an air filling pipe (2), one end of the air filling pipe (2) being connected to the liquefied natural gas supply mechanism (1), and the other end of the air filling pipe (2) being connected to the gas storage bottle (3), and the air filling pipe (2) and the gas storage bottle (3) being detachably connected; an exhaust pipe (4), one end of the exhaust pipe (4) being in communication with the gas storage bottle (3), and the exhaust pipe (4) and the gas storage bottle (3) being detachably connected; A liquid nitrogen protection mechanism (7), the liquid nitrogen protection mechanism (7) comprising a liquid nitrogen supply component (71) and a protection sleeve (73), the protection sleeve (73) being sleeved on the outside of the inflation tube (2), the inner side wall of the protection sleeve (73) being spaced apart from the outer side wall of the inflation tube (2), and the protection sleeve (73) being in communication with the liquid nitrogen supply component (71).

2. A gas pretreatment liquefaction filling protection system according to claim 1, characterized in that: It also includes an installation box (6), the inflation pipe (2) and the exhaust pipe (4) both extending into the installation box (6), and the gas storage bottle (3) being arranged in the installation box (6).

3. A gas pretreatment liquefaction filling protection system according to claim 2, characterized in that: A heat-insulating cavity (61) is provided in a side wall of the installation box (6), and 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 in communication with the liquid nitrogen supply assembly (71), and the other end of the liquid nitrogen return pipe (74) is in communication with the heat-insulating cavity (61).

4. A gas pretreatment liquefaction filling protection system according to claim 3, characterized in that: The liquid nitrogen protection mechanism (7) further comprises a liquid nitrogen recovery tank (75); 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 in communication with the liquid nitrogen recovery tank (75), and the other end of the liquid nitrogen recovery pipe (710) is in communication with the heat-insulating cavity (61).

5. A gas pretreatment liquefaction filling protection system according to claim 4, characterized in that: The liquid nitrogen protection mechanism (7) further comprises a vaporizer (76), a nitrogen storage tank (77) and a nitrogen compressor (78); the liquid nitrogen recovery tank (75), the vaporizer (76), the nitrogen storage tank (77) and the nitrogen compressor (78) are connected in sequence; A nitrogen return pipe (711) is provided between the nitrogen compressor (78) and the installation box (6); one end of the nitrogen return pipe (711) is in communication with the nitrogen compressor (78), and the other end of the nitrogen return pipe (711) is in communication with the heat preservation cavity (61).

6. A gas pretreatment liquefaction filling protection system according to claim 3, characterized in that: The installation box (6) comprises a mounting frame (62) and a middle tube (64); the middle tube (64) is arranged vertically; the mounting frame (62) is fixedly connected to the middle tube (64); and the heat-insulating cavity (61) is provided in a side wall of the middle tube (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 tube (2) and the exhaust tube (4) are both connected to the top plate (63), and the inflation tube (2) and the exhaust tube (4) both extend into the middle cylinder (64); A bottom plate (65) is disposed at the lower side of the middle cylinder (64), and a lifting driving member (66) for driving the bottom plate (65) to move in a vertical direction is disposed between the middle cylinder (64) and the bottom plate (65); The gas cylinder (3) is vertically arranged on the upper side of the bottom plate (65); the gas cylinder (3) and the bottom plate (65) are detachably connected; the gas cylinder (3) and the middle cylinder (64) are plugged in and matched; the gas charging pipe (2) and the gas exhaust pipe (4) are both plugged in and matched with the gas cylinder (3) in the vertical direction.

7. A gas pretreatment liquefaction filling protection system according to claim 1, characterized in that: The outer side of the protective sleeve (73) is covered with a heat preservation layer, and the outer side of the heat preservation layer is covered with a heat insulating layer.

8. A gas pretreatment liquefaction filling protection system according to claim 1, characterized in that: The protective sleeve (73) comprises a plurality of segmented pipes (732), wherein the segmented pipes (732) are sleeved on the outside of the inflation pipe (2), the plurality of segmented pipes (732) are arranged in sequence along the length direction of the inflation pipe (2), and two adjacent inflation pipes (2) are detachably connected.

9. A gas pretreatment liquefaction filling protection system according to claim 8, characterized in that: A support ring (733) is inserted into the segmented pipe (732), and the support ring (733) is sleeved on the outside of the inflation tube (2). The inner wall of the support ring (733) is provided with a plurality of support elastic members (7331), and the plurality of support elastic members (7331) are arranged in sequence at intervals along the circumference of the support ring (733), and the support elastic members (7331) all contact the outer wall of the inflation tube (2).

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