Pump pry pipe structure, tank pry integrated module and LNG filling station

Abstract

This application discloses a pump skid piping structure, a tank skid integrated module, and an LNG refueling station. The pump skid piping structure includes a pump skid integrated into the bottom of a vertical storage tank. The pump skid comprises a frame structure, a piping structure within the enclosed space of the frame structure, and a pump pool structure. The frame structure surrounds the bottom of the vertical storage tank, and its length and width dimensions meet the height and width restrictions of the planned transportation route. Therefore, the pump skid and the vertical storage tank can be transported together, reducing the construction cost of the LNG refueling station. Simultaneously, the pump pool structure is located in a corner within the enclosed space of the frame structure, minimizing the overall footprint of the vertical storage tank and pump skid piping structure while better meeting transportation requirements. Furthermore, the detachable connection via a first module interface and a second module interface facilitates convenient installation and dismantling, eliminating the cumbersome on-site installation process and effectively improving the construction efficiency of the LNG refueling station.

Description

Technical Field

[0001] This application relates to the field of natural gas refueling technology, and more specifically, to a pump skid pipeline structure, a tank skid integrated module, and an LNG refueling station. Background Technology

[0002] In the current construction and operation of natural gas refueling stations, especially liquefied natural gas (LNG) refueling stations, there are common problems such as dispersed equipment layout, low integration, and complex construction, which restrict construction efficiency, economy, and operational reliability. For example, pump skids are generally set up outside vertical storage tanks, with the two placed as independent equipment units. This layout increases the overall footprint of the station. More importantly, various process pipelines (such as liquid inlet, gas return, and pressurization pipelines) between the vertical storage tank and the pump skid require a large amount of docking and assembly work on-site. This process not only has a long construction period and high personnel requirements, but also increases logistics costs because the storage tank and pump skid are usually transported separately to meet independent height and width restrictions.

[0003] In conclusion, how to reduce the construction cost and improve the construction efficiency of LNG refueling stations has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, this application provides a pump skid pipeline structure, a tank skid integrated module, and an LNG refueling station to reduce the construction cost of LNG refueling stations and improve the construction efficiency of LNG refueling stations.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A pump skid piping structure includes a pump skid integrated into the bottom of a vertical liquid storage tank. The pump skid includes a frame structure, a piping structure disposed within the enclosed space of the frame structure, and a pump pool structure.

[0007] The rectangular frame structure surrounds the bottom of the vertical storage tank, and the length and width dimensions of the rectangular frame structure meet the height and width restrictions of the planned transportation route.

[0008] The pump pool structure is located in a corner within the enclosed space of the rectangular frame structure, and is situated outside the vertical projection of the vertical storage tank toward the bottom surface of the rectangular frame structure.

[0009] The pump skid also has a first module interface, which is used to detachably connect to the second module interface on the unloading skid module.

[0010] In some embodiments, the pump pool structure has a pump pool liquid inlet connector and a pump pool air return connector, both of which are arranged facing the bottom of the vertical storage tank. The pipeline structure includes a pump pool liquid inlet pipeline and a pump pool air return pipeline. The pump pool liquid inlet connector is connected to the liquid connection of the vertical storage tank through the pump pool liquid inlet pipeline, and the pump pool air return connector is connected to the gas connection of the vertical storage tank through the pump pool air return pipeline.

[0011] In some embodiments, at least one of the pump pool structures is arranged adjacent to the legs of the vertical storage tank;

[0012] The pipeline arrangement structure corresponding to the pump pool structure adjacent to the support leg is as follows: the pump pool inlet pipeline bends from the inside of the adjacent support leg, bypasses the support leg, and connects with the pump pool inlet connector; the pump pool return gas pipeline bends from the inside of the adjacent support leg, bypasses the support leg, and connects with the pump pool return gas connector.

[0013] In some embodiments, in the pipeline arrangement structure corresponding to the pump pool structure arranged adjacent to the support legs, the pump pool liquid inlet pipeline and the pump pool gas return pipeline are both provided with a space for insulation layer installation between them and the support legs adjacent to them.

[0014] In some embodiments, both the pump pool inlet connector and the pump pool return gas connector are arranged along the diagonal of the frame structure.

[0015] In some embodiments, the chassis of the pump pool structure is a square flange, and the projections of the pump pool inlet connector and the pump pool outlet connector toward the plane of the square flange are both located at one corner of the square flange.

[0016] Compared to the background art description, the pump skid piping structure provided in this application embodiment includes a pump skid integrated into the bottom of a vertical liquid storage tank. The pump skid includes a frame structure, a piping structure disposed within the enclosed space of the frame structure, and a pump pool structure. The frame structure surrounds the bottom of the vertical liquid storage tank, and its length and width dimensions meet the height and width restrictions of the planned transportation route. Therefore, the pump skid and the vertical liquid storage tank can be transported together, significantly reducing transportation costs, which in turn reduces the construction cost of the LNG refueling station. Simultaneously, the pump pool structure is located in a corner within the enclosed space of the frame structure and is situated at the bottom of the vertical liquid storage tank. The vertical projection of the storage tank towards the bottom of the rectangular structure minimizes the overall footprint of the vertical storage tank and pump skid piping structure, while also better meeting transportation needs. Furthermore, the pump skid has a first module interface, which allows for detachable connection to the second module interface on the unloading skid module. After the vertical storage tank and pump skid piping structure are transported to the construction site, they can be connected via the first and second module interfaces, making installation and dismantling extremely convenient. This eliminates the cumbersome on-site installation process and effectively improves the construction efficiency of the LNG refueling station.

[0017] On the other hand, this application also provides a skid-integrated module, including a vertical storage tank and a pump skid piping structure as described in any of the above solutions. Since the aforementioned pump skid piping structure has the above-mentioned technical effects, the skid-integrated module with this pump skid piping structure should also have corresponding technical effects, which will not be elaborated further here.

[0018] In some embodiments, the skid-mounted integrated module further includes a hoisting bracket, which is located within the enclosed space of the frame structure and is arranged adjacent to the pump pool structure. The hoisting bracket enables the jacking of the submersible pump within the pump pool structure.

[0019] In some embodiments, the lifting bracket is disposed on the outer wall of the vertical storage tank;

[0020] Alternatively, the hoisting bracket may be mounted on the support legs of the vertical storage tank;

[0021] Alternatively, the hoisting bracket may be mounted on the rectangular frame structure.

[0022] In some embodiments, the hoisting bracket includes a fixed part and a rotating part;

[0023] The fixing part is provided on the outer wall of the vertical liquid storage tank, the support leg of the vertical liquid storage tank, or the square frame structure; the rotating part includes a vertical beam and a horizontal beam arranged on the vertical beam, the vertical beam is rotatably arranged above the fixing part, and the horizontal beam is provided with a sliding part for the hoisting rope to pass through.

[0024] In some embodiments, one of the fixing part and the vertical beam is provided with a corner limiting groove, and the other is provided with a sliding protrusion that is slidably adapted to the corner limiting groove.

[0025] In some embodiments, the skid-integrated module further includes an EAG heater connected to the vertical storage tank. The EAG heater is disposed on the outer wall of the vertical storage tank, and the projection of the EAG heater toward the bottom surface of the frame structure along the height direction of the vertical storage tank is located within the bottom surface of the frame structure.

[0026] Furthermore, this application also provides an LNG refueling station, including an unloading skid module and a tank skid integrated module as described in any of the above solutions. Since the aforementioned tank skid integrated module has the above-mentioned technical effects, the LNG refueling station with this tank skid integrated module should also have the corresponding technical effects, which will not be elaborated further here.

[0027] In some embodiments, the LNG refueling station further includes an in-station cofferdam located at the installation site and a tank skid concrete foundation located within the in-station cofferdam. The tank skid integration module is located within the tank skid concrete foundation, and the unloading skid module is located within the in-station cofferdam.

[0028] In some embodiments, the unloading skid module is disposed on one side of the cofferdam within the station, and the cement foundation of the tank skid is arranged adjacent to the unloading skid module and positioned close to the middle of the unloading skid module.

[0029] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is an isometric structural schematic diagram of the can skid integrated module provided in the embodiments of this application;

[0032] Figure 2A top view of the integrated skid module provided in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the overall transportation structure of the tank skid integrated module provided in the embodiments of this application;

[0034] Figure 4 A partially enlarged structural diagram of the tank skid integrated module with the submersible pump in the hoisted state provided in this embodiment of the application (hoisting ropes omitted);

[0035] Figure 5 This is a top view of the pump skid piping structure provided in an embodiment of this application.

[0036] Figure 6 A schematic diagram showing the design of angle limiting for the fixed and rotating parts of the hoisting bracket provided in the embodiments of this application;

[0037] Figure 7 A top view of the unloading skid module provided in an embodiment of this application;

[0038] Figure 8 for Figure 7 A schematic diagram of the structure along direction A;

[0039] Figure 9 This is an isometric structural schematic diagram of an LNG refueling station provided in an embodiment of this application;

[0040] Figure 10 A top view of the LNG refueling station provided in an embodiment of this application;

[0041] Figure 11 This is an isometric structural diagram of the pump skid piping structure provided in the embodiments of this application;

[0042] Figure 12 This is a schematic diagram showing the connection between the unloading skid module and the tank skid integrated module provided in an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1- Tank skid integrated module;

[0045] 11-Vertical liquid storage tank;

[0046] 110-outrigger;

[0047] 12-Pump skid;

[0048] 120-Rectangular structure;

[0049] 121 - First Module Interface;

[0050] 122 - Piping structure;

[0051] 1221 - Pump pool inlet pipeline;

[0052] 1222 - Pump pool return gas pipeline;

[0053] 123 - Pump pool structure;

[0054] 1230 - Submersible pump;

[0055] 1231 - Pump pool inlet connector;

[0056] 1232 - Pump pool return connector;

[0057] 13- Lifting bracket;

[0058] 131-Fixing part;

[0059] 132 - Rotating part;

[0060] 1321 - Vertical beam;

[0061] 1322 - Crossbeam;

[0062] 1323 - Sliding part;

[0063] 1324 - Diagonal brace;

[0064] 133 - Corner limiting slide;

[0065] 134 - Sliding protrusion;

[0066] 14-EAG heater;

[0067] 2-Unloading skid module;

[0068] 21-Installation platform;

[0069] 22-Unloading skid;

[0070] 221 - Second Module Interface;

[0071] 222-Unloading turbocharger;

[0072] 23-Gas dispenser;

[0073] 24- Explosion-proof air compressor;

[0074] 25-Air buffer tank;

[0075] 26 - Explosion-proof control cabinet;

[0076] 27-Air dryer;

[0077] 3- Cofferdam within the station;

[0078] 4-Tank skid concrete foundation;

[0079] 5. Transport vehicle. Detailed Implementation

[0080] The core of this application is to provide a pump skid pipeline structure, a tank skid integrated module, and an LNG refueling station, so as to reduce the construction cost of LNG refueling stations and improve the construction efficiency of LNG refueling stations.

[0081] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0082] In the current construction and operation of natural gas refueling stations, especially liquefied natural gas (LNG) refueling stations, there are common problems such as dispersed equipment layout, low integration, and complex construction, which restrict construction efficiency, economy, and operational reliability. For example, pump skids are generally set up outside vertical storage tanks, with the two placed as independent equipment units. This layout increases the overall footprint of the station. More importantly, various process pipelines (such as liquid inlet, gas return, and pressurization pipelines) between the vertical storage tank and the pump skid require a large amount of docking and assembly work on-site. This process not only has a long construction period and high personnel requirements, but also increases logistics costs because the storage tank and pump skid are usually transported separately to meet independent height and width restrictions.

[0083] Based on this, this application provides a pump skid pipeline structure to reduce the construction cost of natural gas refueling stations and improve their construction efficiency.

[0084] Specifically, refer to Figure 1 As shown, the pump skid piping structure provided in this embodiment includes a pump skid 12 integrated into the bottom of the vertical storage tank 11. The pump skid 12 includes a frame structure 120, a piping structure 122 disposed within the enclosed space of the frame structure 120, and a pump pool structure 123. The frame structure 120 surrounds the bottom of the vertical storage tank 11. The length and width dimensions of the frame structure 120 meet the height and width restrictions of the planned transportation route. For example, the length × width of the frame structure 120 can be 3.2 meters × 3.2 meters. In specific applications, the configuration can be selected according to the planned transportation route and design requirements; no further specific limitations are made here. The placement method of the pump skid 12 and the vertical storage tank 11 during overall transportation can refer to... Figure 3The pump tank structure 123 is placed on the transport vehicle 5 in the manner shown. The pump tank structure 123 is located in the corner of the enclosed space of the frame structure 120 and is located outside the vertical projection of the vertical storage tank 11 toward the bottom surface of the frame structure 120. In addition, the pump skid 12 also has a first module interface 121, which is detachably connected to the second module interface 221 on the unloading skid module 2.

[0085] Key terms explained:

[0086] The core function of the vertical LNG storage tank 11 is to safely and cryogenically store large quantities of LNG. It is the "heart" of the gas station and the storage center for all liquefied natural gas. Its design and management are directly related to the safety and economy of the entire station.

[0087] The core function of pump skid 12 is to provide the necessary power and pressure for LNG transportation. Storage tanks are merely warehouses; the cargo (LNG) inside won't simply escape, nor can it be pumped into vehicles at high pressure. The pump skid is the key to solving this problem.

[0088] Piping structure 122 is an integration of multiple pipes, such as inlet, outlet, and pressurization pipes. (Refer to...) Figure 4 Specifically, it includes a pump pool inlet pipe 1221, a pump pool return gas pipe 1222, a pump pool outlet pipe, a booster inlet pipe, a booster return gas pipe, an instrument air pipe, etc. The pump pool inlet pipe 1221 and the pump pool return gas pipe 1222 are connected between the pump pool structure 123 and the vertical storage tank 11. The pump pool outlet pipe is used to connect to the gas dispenser through the gas filling pipe.

[0089] Location and Structure of Pump Pool Structure 123: This is the core structural component of the pump skid. It is a vertical cylindrical pressure vessel. Its functions include housing the pump body, forming an inlet channel, and providing insulation. Housing the Pump Body: The entire pump body of the cryogenic submersible pump is hoisted from the top and inserted into and fixed within this pump pool; therefore, the pump pool is the pump's "home." Forming an Inlet Channel: After LNG enters from the pump inlet valve, it flows directly into the pump pool, filling the area around the pump body and providing sufficient liquid for the pump's suction inlet. Insulation: As a pressure vessel, it also helps reduce the loss of LNG's cold energy.

[0090] The flow path of LNG is: storage tank → root valve → pump pool inlet pipeline 1221 (may include filter) → pump front valve → pump pool structure 123 → sucked in by cryogenic submersible pump and pressurized and sent out.

[0091] The unloading skid module 2 refers to the highly integrated integration of various equipment required for the unloading process (such as pipelines, valves, instruments, heat exchangers, etc.) onto a unified steel structure base (i.e., a skid), forming a complete functional module. Modularization and integration are the core characteristics of skid-mounted equipment. All components have been installed, connected, and tested in the factory; upon arrival at the site, it is simply a "functional package" that needs external connections. As a whole, the unloading skid is specifically responsible for completing the entire operational process of safely transferring liquefied natural gas from transport tankers to on-site storage tanks.

[0092] In practical applications, this pump skid piping structure allows for the transport of the pump skid 12 and the vertical storage tank 11 together. Since the frame structure 120 surrounds the bottom of the vertical storage tank 11, and the dimensions of the frame structure 120 meet the height and width restrictions of the planned transport route, transportation costs are significantly reduced, thus lowering the construction costs of LNG refueling stations. Simultaneously, the pump pool structure 123 is located in a corner within the enclosed space of the frame structure 120, and is situated outside the vertical projection of the vertical storage tank 11 towards the bottom of the frame structure 120. This design maximizes the compression of the vertical storage tank 11 and the pump skid. The overall footprint of the pipeline structure is minimized, which also better meets transportation needs and further reduces the construction cost of LNG refueling stations. In addition, since the pump skid 12 also has a first module interface 121, which is used to detachably connect to the second module interface 221 on the unloading skid module 2, after the vertical storage tank 11 and the pump skid pipeline structure are transported to the construction site, they can be connected through the first module interface 121 and the second module interface 221. The installation and dismantling operations are very convenient, saving the cumbersome on-site installation process and effectively improving the construction efficiency of LNG refueling stations.

[0093] Furthermore, the pump skid 12 integrated into the bottom of the vertical storage tank 11 has the following advantages: Firstly, it eliminates the need for welding (construction) and pressure piping, resulting in high integration and reducing the need for design institutes, supervisors, and government regulatory personnel, significantly shortening construction time and complexity. Moreover, subsequent simple dismantling allows the vertical storage tank 11 and pump skid 12 to be transported to other regions for use. Secondly, only a control room is required; other components are highly integrated, and piping and cable design and installation can all be completed in the factory. This also reduces the risk of the buffer tank's piping freezing or condensation in low-temperature environments, which could lead to water in the instrumentation system and pose safety hazards.

[0094] In some other specific implementation schemes, refer to Figure 4 and Figure 5 , combined Figure 11The aforementioned pump pool structure 123 has a pump pool liquid inlet connector 1231 and a pump pool air return connector 1232. Both the pump pool liquid inlet connector 1231 and the pump pool air return connector 1232 are arranged facing the bottom of the vertical storage tank 11. The pipeline structure 122 includes a pump pool liquid inlet pipeline 1221 and a pump pool air return pipeline 1222. The pump pool liquid inlet connector 1231 is connected to the liquid connection of the vertical storage tank 11 through the pump pool liquid inlet pipeline 1221, and the pump pool air return connector 1232 is connected to the air connection of the vertical storage tank 11 through the pump pool air return pipeline 1222.

[0095] At least one pump pool structure 123 is arranged adjacent to the support leg 110 of the vertical storage tank 11. The pipeline arrangement corresponding to the pump pool structure 123 arranged adjacent to the support leg 110 is as follows: the pump pool inlet pipeline 1221 bends from the inside of its adjacent support leg 110, bypasses the support leg 110, and connects to the pump pool inlet connector 1231; the pump pool return gas pipeline 1222 bends from the inside of its adjacent support leg 110, bypasses the support leg 110, and connects to the pump pool return gas connector 1232. Through the above arrangement, the pump pool inlet connector 1231, the pump pool return gas connector 1232, the pump pool inlet pipeline 1221, and the pump pool return gas pipeline 1222 can be integrated as close as possible to the bottom of the vertical storage tank 11 or located at the bottom of the vertical storage tank 11, thereby minimizing the space occupied by the tank skid integrated module 1, compressing its height and width during transportation, and making transportation more convenient. The bending angle can be designed according to actual needs and processing capabilities, and no further specific limitations are made here.

[0096] For example, the above-mentioned pump pool inlet connector 1231 and pump pool return air connector 1232 can both be designed to be arranged along the diagonal of the frame structure 120.

[0097] As another example, the chassis of the pump pool structure 123 can be a square flange, and the projections of the pump pool inlet connector 1231 and the pump pool return air connector 1232 toward the plane of the square flange can be designed to be located at one corner of the square flange.

[0098] In a further embodiment, in the pipeline arrangement structure corresponding to the pump pool structure 123 arranged adjacent to the support leg 110, both the pump pool inlet pipeline 1221 and the pump pool return gas pipeline 1222 have reserved space for insulation layer installation between them and the adjacent support leg 110. This ensures the insulation performance of the pipeline transmission while saving space.

[0099] On the other hand, refer to Figure 1 As shown in the figure, this application embodiment also provides a skid-integrated module, including a vertical storage tank 11 and a pump skid piping structure described in any of the above solutions. Since the aforementioned pump skid piping structure has the above-mentioned technical effects, the skid-integrated module with this pump skid piping structure should also have the corresponding technical effects, which will not be described in detail here.

[0100] In a further implementation plan, refer to Figure 1 Combination Figure 4 The aforementioned tank skid integrated module 1 may also include a lifting bracket 13, which is located within the enclosed space of the frame structure 120 and is arranged adjacent to the pump pool structure 123. The lifting bracket 13 can be used to lift the submersible pump 1230 in the pump pool structure 123.

[0101] Specifically, the lifting bracket 13 can be installed on the outer wall of the vertical liquid storage tank 11; or, the lifting bracket 13 can be installed on the support leg 110 of the vertical liquid storage tank 11; or, the lifting bracket 13 can be installed on the frame structure 120. In actual application, the design on the corresponding structure can be selected according to the actual layout space and needs, and no further specific limitations are made here.

[0102] In some more specific implementation plans, refer to Figure 4 Combination Figure 6 As shown, the aforementioned hoisting bracket 13 may specifically include a fixed part 131 and a rotating part 132. The fixed part 131 is disposed on the outer wall of the vertical storage tank 11, on the legs 110 of the vertical storage tank 11, or on the square frame structure 120. The rotating part 132 includes a vertical beam 1321 and a horizontal beam 1322 disposed transversely on the vertical beam 1321. The vertical beam 1321 is rotatably disposed above the fixed part 131. The horizontal beam 1322 is provided with a sliding part 1323 for the hoisting rope to pass through. This sliding part 1323 may specifically be a slip ring or pulley, through which the hoisting rope can pass. Furthermore, to enhance the structural strength between the vertical beam 1321 and the horizontal beam 1322, a diagonal brace 1324 may be designed between them. Furthermore, the fixing part 131 and the rotating part 132 can be specifically designed with a plug-in rotating structure. For example, the fixing part 131 can be designed as a tube, and the rotating part 132 can be designed as a rod or tube plugged into the fixing part 131. In addition, at least one of the vertical beam 1321 of the fixing part 131 and the rotating part 132 can be designed as a lifting structure.

[0103] In a further implementation plan, refer to Figure 4 As shown, one of the aforementioned fixing part 131 and vertical beam 1321 can be provided with a corner limiting groove 133, and the other can be provided with a sliding protrusion 134 that slides and adapts to the corner limiting groove 133. By designing the aforementioned corner limiting groove 133 and sliding protrusion 134, the relative rotation angle between the fixing part 131 and the rotating part 132 can be limited, thereby making it easier to disassemble and maintain the submersible pump 1230.

[0104] In some other specific implementation schemes, refer to Figure 1The aforementioned skid-mounted integrated module 1 may further include an EAG heater 14 connected to the vertical storage tank 11. The EAG heater 14 is disposed on the outer wall of the vertical storage tank 11, and the projection of the EAG heater 14 along the height direction of the vertical storage tank 11 toward the bottom surface of the frame structure 120 is located within the bottom surface of the frame structure 120. This design ensures that the design of the EAG heater 14 does not affect the transportation of the skid-mounted integrated module 1, and its height and width limits are determined by the length and width dimensions of the frame structure 120.

[0105] On the other hand, refer to Figure 9 and Figure 10 This application also provides an LNG refueling station, including an unloading skid module 2 and a tank skid integrated module as described in any of the above embodiments. Since the aforementioned tank skid integrated module has the above-mentioned technical effects, the LNG refueling station with this tank skid integrated module should also have the corresponding technical effects, which will not be elaborated further here.

[0106] It is worth mentioning that the unloading skid module 2 of the LNG refueling station can be designed as an integrated module structure of unloading skid 22 and refueling machine 23, that is, unloading skid module 2 includes an integrated design of unloading skid 22 and refueling machine 23. Of course, it can also be designed as a separate non-integrated structure of unloading skid 22 and refueling machine 23. In actual application, the configuration can be selected according to actual needs, and no more specific limitations are made here.

[0107] To help those skilled in the art better understand the structure of the LNG refueling station provided in the embodiments of this application, the following description uses an integrated modular structure of the unloading skid 22 and the refueling machine 23 as an example:

[0108] Reference Figures 7-8 Combination Figure 12 The unloading skid module 2 includes an installation platform 21, an unloading skid 22 mounted on the installation platform 21, and a gas dispenser 23. The gas dispenser 23 is arranged side-by-side with the unloading skid 22, and is located on one or both sides of the unloading skid 22. The unloading skid 22 has a second module interface 221, which can be detachably connected to the first module interface 121, for example, via a flange. By integrating the gas dispenser 23 with the unloading skid 22 onto a single installation platform 21, on-site assembly is more convenient, saving a significant amount of piping connection work.

[0109] In a further implementation plan, refer to Figure 8 As shown, the unloading skid module 2 may also include an explosion-proof air compressor 24, an air buffer tank 25, an explosion-proof control cabinet 26, an air dryer 27, and an integrated canopy for covering the gas dispenser 23, all mounted on the installation platform 21. By integrating the above-mentioned equipment into the unloading skid module 2, the on-site installation process and operation can be further simplified, which helps to improve construction efficiency.

[0110] Among them, the explosion-proof control cabinet 26 is the "brain" and "nerve center" of the entire skid. It has many functions such as centralized control, safety interlocking, and status display.

[0111] Centralized control: It receives signals from equipment such as unloading skids, pressurizers (boosters), storage tanks, and gas dispensers, enabling automatic control and monitoring of the entire gas station's process. Operators can complete unloading, pre-cooling, and pressurization processes with a single click.

[0112] Safety interlock: This is its most critical function. When the system detects danger signals such as abnormal pressure, leakage, or emergency shutdown, the control cabinet will immediately shut off the relevant valves and stop the equipment operation to ensure the safety of the station area.

[0113] Status display: All key parameters such as pressure, temperature, liquid level, and equipment status are displayed in real time via touch screen or indicator lights.

[0114] Because it is installed in the process equipment area, which is an explosion hazard zone, it must be equipped with an explosion-proof structure to prevent accidents caused by electrical sparks.

[0115] The explosion-proof air compressor 24, the air dryer 27, and the air buffer tank 25 constitute a complete instrument air system, which is the "muscle" and "power source" for the station's automated operation.

[0116] Overall function: Produces clean, dry compressed air (referred to as "instrument air") to power all pneumatic valves and actuators.

[0117] Division of labor for each component:

[0118] Explosion-proof air compressor 24: Power source. Responsible for compressing ambient air to increase pressure. It must be explosion-proof, for the same reasons as the explosion-proof control cabinet.

[0119] Air Dryer 27: Purification Unit. Removes moisture and oil from compressed air. This is a crucial step because moisture can freeze in cold weather, clogging or damaging pneumatic lines and causing control system malfunctions.

[0120] Air Buffer Tank 25: Air Storage and Pressure Stabilization Unit. Stores compressed air and balances system pressure fluctuations. When multiple pneumatic valves operate simultaneously requiring a large amount of gas, the buffer tank can supply air instantly, avoiding frequent start-stop of the air compressor and ensuring stable pressure.

[0121] Workflow: Explosion-proof air compressor 24 → Air dryer → Air buffer tank 25 → Clean and dry instrument air pipeline network → Drive various pneumatic valves.

[0122] The integrated canopy primarily provides protection and signage for the gas dispenser and operating area.

[0123] It should be noted that the air buffer tank 25 can be installed on either the upper or lower plane of the mounting platform 21. In practical applications, the configuration can be selected based on actual needs, and no further specific limitations are made here.

[0124] In some specific implementation plans, refer to Figure 7 and Figure 8 As shown, the unloading skid 22 has an unloading booster 222. The unloading booster 222 can be installed on the upper plane of the mounting platform 21 or on the lower plane of the mounting platform 21. In specific applications, the configuration can be selected according to actual needs, and no further specific limitations are made here.

[0125] For example, there are multiple unloading boosters 222, arranged in a separate parallel configuration. These multiple unloading boosters 222 can be designed to be laid side-by-side on the upper or lower plane of the mounting platform 21. This structural design makes the mounting platform 21 of the unloading skid module 2 more flattened, increasing the number of unloading skid mounting positions and the available unloading locations. Alternatively, the multiple unloading boosters 222 can be designed to be stacked; the arrangement can be selected according to actual needs in practical applications.

[0126] In some specific implementation plans, refer to Figure 9 and Figure 10 As shown, the LNG refueling station may also include an internal dike 3 located at the installation site and a tank skid concrete foundation 4 located within the internal dike 3. The tank skid integrated module 1 is located within the tank skid concrete foundation 4, and the unloading skid module 2 is located within the internal dike 3. By designing the dike structure, the LNG refueling station possesses a passive but crucial safety barrier. It does not actively prevent leaks, but in the event of a worst-case leak, it can control the consequences within a manageable range, serving as the last physical barrier against catastrophic accidents and directly impacting the safety of personnel, property, and the environment in and around the station area.

[0127] In a further implementation plan, refer to Figure 10 As shown, the unloading skid module 2 can be installed on one side of the cofferdam 3 within the station. The tank skid concrete foundation 4 is arranged adjacent to the unloading skid module 2 and positioned close to the middle of the unloading skid module 2. This design makes more rational use of the overall space, helps to reduce the overall footprint of the LNG refueling station, and also provides more maintenance space for the tank skid integrated module 1.

[0128] Specifically, the unloading skid module 2 (such as the unloading skid and the gas dispenser 23) is installed within the cofferdam 3 inside the station, and the tank skid integrated module 1 (integration of vertical storage tank 11 and pump skid 12) is installed on the tank skid concrete foundation 4. This can reduce the footprint, reduce pipeline length, reduce pipeline bends, reduce construction time, and improve construction efficiency; furthermore, shorter pipelines and fewer bends can reduce medium cooling loss and lower medium flow resistance.

[0129] Among them, liquefied natural gas (LNG) refueling stations suffer from significant cooling losses, which directly affect the filling capacity, driving range, and operating costs of refueling vehicles through changes in the medium's state and a decrease in system efficiency. The specific impacts are as follows:

[0130] 1. The amount of liquid added is "artificially high," resulting in a shorter actual driving mileage.

[0131] LNG is liquid at low temperatures (approximately -162°C). Cooling losses cause some of the liquid LNG to vaporize upon heating, forming a gas-liquid mixture. The vehicle's storage tank's rated volume is calculated based on liquid LNG. When the refueling machine fills the tank with this gas-liquid mixture, although the flow meter may show the rated volume, the actual mass of liquid LNG is reduced (for the same volume, the mass of gaseous LNG is only about 1 / 600th of that of liquid LNG). This can result in the vehicle appearing fully filled, but due to insufficient usable liquid LNG, the driving range is reduced by 10%-30% compared to normal conditions (the exact percentage depends on the degree of cooling loss).

[0132] 2. The vehicle's dynamic stability has decreased, posing a safety hazard.

[0133] LNG vehicles rely on natural gas, the vaporized form of liquefied LNG, for their engines. If the refueling station suffers excessive cooling losses, resulting in a high proportion of gaseous LNG being added to the vehicle's tank, the pressure inside the tank can rise rapidly. On one hand, this can cause vapor lock during vehicle operation, leading to unstable engine air supply and problems such as power fluctuations and idling vibrations. On the other hand, if the tank pressure exceeds a safety threshold, the safety valve will automatically release pressure, wasting natural gas and potentially creating a low-temperature zone near the pressure relief port, posing a risk of frostbite to personnel and equipment.

[0134] 3. Increased vehicle operating costs reduce the economic viability of LNG.

[0135] Users typically pay for LNG refueling in cubic meters or kilograms. The cooling loss resulting in a mixture of gas and liquid during refueling essentially means users are paying the same price for gaseous LNG as for liquid LNG. For example, if cooling loss causes 10% of the liquid LNG to vaporize, for every 100kg of LNG added, the user only receives 90kg of liquid LNG, effectively paying an extra 10% in cost. Long-term use of this will significantly increase vehicle operating costs and diminish the economic advantage of LNG compared to diesel and gasoline.

[0136] Liquefied natural gas (LNG) has high flow resistance, which can directly affect the operational stability of cryogenic submersible pumps and the filling accuracy of dispensers by increasing equipment load and disrupting the medium's state. In severe cases, it may lead to equipment failure or safety risks. The specific impacts are as follows:

[0137] 1. Impact on cryogenic submersible pumps: overload and shortened lifespan.

[0138] Cryogenic submersible pumps are the core power source for LNG transportation; increased flow resistance will cause them to operate under "over-condition" conditions for extended periods.

[0139] Motor overload and soaring energy consumption: To overcome greater pipeline resistance (such as excessively long pipelines, too many bends, or undersized pipe diameters), the pump motor needs to output higher power, causing the current to exceed the rated value. Long-term overload will lead to increased heating of the motor windings and accelerated aging of the insulation layer, not only increasing energy consumption by 10%-20%, but also potentially causing motor burnout.

[0140] Increased risk of cavitation: Excessive resistance can cause a sudden drop in pressure at the pump inlet. When the pressure falls below the saturated vapor pressure of LNG at the current temperature, the liquid LNG will prematurely vaporize and form bubbles (i.e., "cavitation"). When the bubbles burst in the high-pressure zone inside the pump, they will generate impact, damaging the impeller surface, causing pump vibration and increased noise. At the same time, the flow rate and head will fluctuate significantly, and in severe cases, the pump will be unable to deliver liquid normally.

[0141] Accelerated mechanical wear: Increased resistance causes the pump's rotor, bearings, and other moving parts to bear greater axial and radial forces. The lubrication effect will decrease due to excessive load, and the wear rate between parts will accelerate, resulting in a shorter pump maintenance cycle and a significant increase in the failure rate.

[0142] 2. Impact on the dispensing machine: Decreased filling accuracy and metering distortion.

[0143] The LNG dispenser measures the amount of LNG being filled using a flow meter. High flow resistance can directly interfere with its metering and control logic.

[0144] Flow fluctuations and inaccurate metering: Unstable resistance can cause the LNG flow rate into the dispenser to fluctuate greatly, while the dispenser's flow meter is highly dependent on a stable flow field. Flow fluctuations can cause metering errors to exceed the standard range, potentially leading to situations such as "overcharging" (users pay but the actual amount dispensed is insufficient) or "undercharging" (gas station incurring losses), causing operational disputes.

[0145] Slower dispensing speed and timed shutdown: To ensure filling safety, the dispenser has maximum pressure and flow rate limits. When excessive resistance causes the actual flow rate to fall below the set value, the dispensing time will be significantly extended. Some dispensers will also automatically shut down due to "timed filling," triggering a protection mechanism that affects dispensing efficiency and user experience.

[0146] Valve and seal damage: Components such as shut-off valves and check valves inside the LNG dispenser need to operate under stable pressure. Excessive resistance can cause pressure fluctuations that frequently impact the valve core and gaskets, reducing their sealing performance and potentially leading to LNG leakage or valve jamming.

[0147] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0148] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0149] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0150] It should also be noted that in the description of the embodiments of this application, the terms "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0151] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A pump skid piping structure, characterized in that, Includes a pump skid (12) integrated at the bottom of a vertical storage tank (11), the pump skid (12) including a frame structure (120), a pipeline structure (122) disposed in the enclosed space of the frame structure (120) and a pump pool structure (123); The rectangular frame structure (120) surrounds the bottom of the vertical storage tank (11), and the length and width dimensions of the rectangular frame structure (120) meet the height and width restrictions of the planned transportation route. The pump pool structure (123) is located in the corner of the enclosed space of the frame structure (120) and is located outside the vertical projection of the vertical storage tank (11) toward the bottom surface of the frame structure (120). The pump skid (12) also has a first module interface (121), which is used to detachably connect to the second module interface (221) on the unloading skid module (2).

2. The pump sled tubing structure of claim 1, wherein, The pump pool structure (123) has a pump pool liquid inlet connector (1231) and a pump pool air return connector (1232). Both the pump pool liquid inlet connector (1231) and the pump pool air return connector (1232) are arranged facing the bottom of the vertical storage tank (11). The pipeline structure (122) includes a pump pool liquid inlet pipeline (1221) and a pump pool air return pipeline (1222). The pump pool liquid inlet connector (1231) is connected to the liquid connection of the vertical storage tank (11) through the pump pool liquid inlet pipeline (1221), and the pump pool air return connector (1232) is connected to the air connection of the vertical storage tank (11) through the pump pool air return pipeline (1222).

3. The pump skid piping structure as described in claim 2, characterized in that, At least one of the pump pool structures (123) is arranged adjacent to the support leg (110) of the vertical storage tank (11); The pipeline arrangement structure corresponding to the pump pool structure (123) arranged adjacent to the support leg (110) is as follows: the pump pool inlet pipeline (1221) bends from the inside of the adjacent support leg (110) and passes around the support leg (110), and is connected to the pump pool inlet connector (1231); the pump pool return gas pipeline (1222) bends from the inside of the adjacent support leg (110) and passes around the support leg (110), and is connected to the pump pool return gas connector (1232).

4. The pump skid piping structure as described in claim 3, characterized in that, In the pipeline arrangement structure corresponding to the pump pool structure (123) arranged adjacent to the support leg (110), the pump pool liquid inlet pipeline (1221) and the pump pool gas return pipeline (1222) are both reserved with the support leg (110) adjacent to them for setting up a heat insulation layer.

5. The pump skid piping structure as described in claim 3, characterized in that, Both the pump pool inlet connector (1231) and the pump pool return air connector (1232) are arranged along the diagonal of the frame structure (120).

6. The pump sled tubing structure of claim 3, wherein, The base of the pump pool structure (123) is a square flange, and the projections of the pump pool liquid inlet connector (1231) and the pump pool air return connector (1232) toward the plane of the square flange are both located at one corner of the square flange.

7. A can prying integrated module characterized by, It includes a vertical storage tank (11) and a pump skid piping structure as described in any one of claims 1-6.

8. The can prying integrated module of claim 7, wherein, The skid-mounted integrated module (1) also includes a hoisting bracket (13), which is located within the enclosed space of the frame structure (120) and is arranged adjacent to the pump pool structure (123). The hoisting bracket (13) can be used to hoist the submersible pump (1230) in the pump pool structure (123).

9. The can prying integrated module of claim 8, wherein, The hoisting bracket (13) is installed on the outer wall of the vertical storage tank (11); Alternatively, the hoisting bracket (13) may be mounted on the support leg (110) of the vertical storage tank (11); Alternatively, the hoisting bracket (13) may be mounted on the frame structure (120).

10. The can skid integrated module as described in claim 9, characterized in that, The hoisting bracket (13) includes a fixed part (131) and a rotating part (132); The fixing part (131) is provided on the outer wall of the vertical liquid storage tank (11), the support leg (110) of the vertical liquid storage tank (11), or the square frame structure (120); the rotating part (132) includes a vertical beam (1321) and a horizontal beam (1322) arranged horizontally on the vertical beam (1321). The vertical beam (1321) is rotatably arranged above the fixing part (131), and the horizontal beam (1322) is provided with a sliding part (1323) for the hoisting rope to pass through.

11. The can prying integrated module of claim 10, wherein, One of the fixing part (131) and the vertical beam (1321) is provided with a corner limiting groove (133), and the other is provided with a sliding protrusion (134) that is slidably adapted to the corner limiting groove (133).

12. The can prying integrated module of claim 7, wherein, The skid-integrated module (1) further includes an EAG heater (14) connected to the vertical storage tank (11). The EAG heater (14) is disposed on the outer side wall of the vertical storage tank (11), and the projection of the EAG heater (14) toward the bottom surface of the frame structure (120) along the height direction of the vertical storage tank (11) is located in the bottom surface of the frame structure (120).

13. An LNG fuelling station, characterised in that, It includes an unloading skid module (2) and a tank skid integrated module (1) as described in any one of claims 7-12.

14. The LNG fueling station of claim 13, wherein, It also includes a station cofferdam (3) set at the installation site and a tank skid cement foundation (4) set in the station cofferdam (3). The tank skid integrated module (1) is set in the tank skid cement foundation (4), and the unloading skid module (2) is set in the station cofferdam (3).

15. The LNG refueling station as described in claim 14, characterized in that, The unloading skid module (2) is located on one side of the cofferdam (3) in the station. The cement foundation (4) of the tank skid is arranged adjacent to the unloading skid module (2) and is located near the middle of the unloading skid module (2).

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