A LNG skid-mounted fueling device for LNG fueling station

Abstract

The utility model provides a kind of for LNG gas station LNG skid-mounted gas dispenser, including skid-mounted plate and the storage tank, protective cover, condensing tank and gas dispenser being arranged on its top, the bottom between the both ends of the storage tank and the top of skid-mounted plate is fixedly provided with support. For LNG gas station LNG skid-mounted gas dispenser can extract BOG gas in storage tank and carry out compression by compressor and suction pipe, compressed BOG gas enters the inside of first connecting box through communicating pipe, it is convenient to carry out shunt by longitudinal groove and connecting pipe, make BOG gas contact with cold water fully by the connecting pipe, communicating groove and heat conducting plate being set, it is convenient to liquefy BOG gas, the collection tank being set is convenient to collect re-liquefied natural gas, and ensure the form of liquefied natural gas, finally re-liquefied natural gas is sent into storage tank for reuse by delivery pump, BOG gas does not need to be stored, it is convenient to improve the security and practicality of the gas dispenser.

Description

Technical Field

[0001] This utility model relates to the field of LNG refueling technology, specifically to an LNG skid-mounted refueling device for LNG refueling stations. Background Technology

[0002] Skid-mounted LNG refueling stations typically include equipment such as LNG storage tanks and refueling machines. The LNG storage tanks are used to store liquefied natural gas.

[0003] Chinese utility model patent CN203202614U discloses an energy-saving LNG skid-mounted refueling device, comprising an outer frame and a gas storage tank fixed within the outer frame. The gas storage tank has an exhaust port on its top, which is connected to a gas collection tank via a conduit containing a suction device. The gas collection tank can collect the discharged BOG gas, reducing environmental pollution; however, it cannot immediately treat the BOG gas, and as the amount of BOG gas inside the collection tank increases, the internal pressure rises, posing a safety hazard and reducing the practicality of this refueling device.

[0004] Therefore, this utility model provides an LNG skid-mounted refueling device for LNG refueling stations. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an LNG skid-mounted refueling device for LNG refueling stations, thereby solving the problems mentioned in the background. This invention uses a compressor and an extraction pipe to extract and compress BOG gas from the storage tank. The compressed BOG gas is then condensed and liquefied through a condenser and condensation mechanism. Finally, the reliquefied natural gas is pumped back into the storage tank for reuse, eliminating the need for BOG gas storage and thus improving the safety and practicality of the refueling device.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an LNG skid-mounted refueling device for LNG refueling stations, comprising a skid plate and a storage tank, a protective cover, a condenser box, and a refueling machine mounted on its top. Supports are fixedly installed between the bottom of both ends of the storage tank and the top of the skid plate. The protective cover is mounted on the top of the storage tank via support rods and fixing blocks. The condenser box is fixedly installed on the top of one end of the skid plate. Inside the condenser box, a condensation mechanism and a collection box are fixedly installed sequentially from top to bottom. The condensation mechanism includes a first connecting box, a second connecting box, a connecting pipe, and a heat-conducting plate. The collection box and the first connecting box are fixedly installed at the bottom and top of the inner side of the condenser box, respectively. The second connecting box is fixedly installed on the top of the collection box. The connecting pipe is fixedly connected between the first and second connecting boxes. One end of the collection box is fixedly connected to an exhaust pipe.

[0007] Furthermore, the support rods are symmetrically fixed at the bottom of both ends of the protective cover, the protective cover is U-shaped, the bottom end of the support rod is fixedly connected to the top of the support, and the fixing blocks are symmetrically fixed between the top of the storage tank and the inner top wall of the protective cover.

[0008] Furthermore, the storage tank is symmetrically and fixedly provided with annular supports at both ends inside, and an inner liner is fixedly installed inside the annular supports. An insulation layer is fixedly installed between the inner liner and the inner wall of the storage tank.

[0009] Furthermore, the inner liner and the storage tank are fixedly connected to an inlet and an outlet at one end, with the inlet located above the outlet. The gas dispenser is fixedly installed at the top of the other end of the skid plate, corresponding to the outlet and inlet positions.

[0010] Furthermore, a compressor is fixedly installed at the top of the condenser box, and a suction pipe is fixedly installed laterally inside the top of the inner liner. An air hole is opened at the bottom of the inner end of the suction pipe, and the outer end of the suction pipe is fixedly connected to the inlet of the compressor.

[0011] Furthermore, a longitudinal groove is provided inside one end of the first connecting box, and the compressor outlet is fixedly connected to the longitudinal groove through a connecting pipe. A connecting groove is provided in a matrix inside the other end of the first connecting box.

[0012] Furthermore, a connecting groove is provided inside one end of the second connecting box, and the connecting pipe is fixedly connected between the longitudinal groove and the bottom connecting groove, and between the top connecting groove and the bottom connecting groove. The connecting pipe on the right side is fixedly connected to the collection box, and the heat-conducting plate is fixedly installed on the outside of the connecting pipe.

[0013] Furthermore, a delivery pump is fixedly installed on one side of the outer wall of the condenser, and the inlet of the delivery pump is fixedly connected to the collection tank through a connecting pipe. A circulation pipe is fixedly installed inside the bottom of the inner liner, and one end of the circulation pipe is fixedly connected to the outlet of the delivery pump. A water outlet and a water inlet are fixedly connected to the top and bottom of the same side of the condenser, respectively.

[0014] The beneficial effects of this utility model are as follows: This utility model provides an LNG skid-mounted refueling device for LNG refueling stations. It uses a compressor and extraction pipe to extract and compress BOG gas from the storage tank. The compressed BOG gas enters the first connecting box through a connecting pipe, facilitating diversion via a longitudinal groove and connecting pipe. The connecting pipe, connecting groove, and heat-conducting plate ensure sufficient contact between the BOG gas and cold water, facilitating liquefaction. The collection box facilitates the collection of reliquefied natural gas while maintaining its original form. Finally, a delivery pump sends the reliquefied natural gas back to the storage tank for reuse, eliminating the need for BOG gas storage and improving the safety and practicality of the refueling device. The protective cover enhances the protection of the storage tank, slows down corrosion, and extends its service life. Attached Figure Description

[0015] Figure 1 This is a structural diagram of an LNG skid-mounted refueling device for an LNG refueling station according to the present invention; Figure 2 This is a front cross-sectional view of an LNG skid-mounted refueling device for an LNG refueling station according to the present invention. Figure 3 This is a vertical sectional view of a condenser box for an LNG skid-mounted refueling device in an LNG refueling station, according to this utility model. Figure 4 This is a structural diagram of a condensation mechanism for an LNG skid-mounted refueling device in an LNG refueling station, according to the present invention. Figure 5 This is a structural diagram of the condensation mechanism of an LNG skid-mounted refueling device for an LNG refueling station according to the present invention. Figure 6 This is a transverse cross-sectional view of the first connecting box of an LNG skid-mounted refueling device for an LNG refueling station according to the present invention. Figure 7 This is a cross-sectional view of the second connecting box of an LNG skid-mounted refueling device for an LNG refueling station according to the present invention; Figure 8 This is a cross-sectional view of a protective cover for an LNG skid-mounted refueling device in an LNG refueling station according to the present invention; In the diagram: 1. Skid-mounted plate; 2. Support; 3. Storage tank; 4. Protective cover; 5. Condensation box; 6. Compressor; 7. Suction pipe; 8. Gas dispenser; 9. Inner liner; 10. Insulation layer; 11. Circular support; 12. Condensation mechanism; 13. Collection box; 14. Exhaust pipe; 15. Transfer pump; 16. Fixing block; 17. Water outlet; 18. Water inlet; 19. First connecting box; 20. Connecting pipe; 21. Heat-conducting plate; 22. Second connecting box; 23. Longitudinal groove; 24. Connecting groove; 25. Support rod. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] Please see Figures 1 to 8 This utility model provides a technical solution: an LNG skid-mounted refueling device for LNG refueling stations, comprising a skid plate 1 and a storage tank 3, a protective cover 4, a condenser box 5, and a refueling machine 8 mounted on top of it. Supports 2 are fixedly installed between the bottom of both ends of the storage tank 3 and the top of the skid plate 1. The protective cover 4 is mounted on the top of the storage tank 3 via support rods 25 and fixing blocks 16. The condenser box 5 is fixedly installed on the top of one end of the skid plate 1. Inside the condenser box 5, a condensation mechanism 12 and a collection box 13 are fixedly installed sequentially from top to bottom. The condensation mechanism 12 includes a first connecting box 19, a second connecting box 22, a connecting pipe 20, and a heat-conducting plate 21. The collector 13 and the first connecting box 19 are respectively fixedly installed at the bottom and top of the inner side of the condensing box 5. The second connecting box 22 is fixedly installed at the top of the collecting box 13. The connecting pipe 20 is fixedly connected between the first connecting box 19 and the second connecting box 22. One end of the collecting box 13 is fixedly connected to the exhaust pipe 14. Through the cooperation of the condensing mechanism 13, including the condensing box 5, the first connecting box 19, the second connecting box 22, the connecting pipe 20, and the heat-conducting plate 21, the BOG gas can be condensed and liquefied immediately without storage, which can improve the safety of the device. It can also reuse the reliquefied natural gas, which can improve the practicality of the device.

[0018] In this embodiment, the support rods 25 are symmetrically fixed at the bottom of both ends of the protective cover 4. The protective cover 4 is U-shaped. The bottom end of the support rods 25 is fixedly connected to the top of the support 2. The fixing blocks 16 are symmetrically fixed between the top of the storage tank 3 and the inner top wall of the protective cover 4. The protective cover 4 can increase the protection of the storage tank 3, slow down the corrosion rate of the surface of the storage tank 3, and facilitate the improvement of the service life of the storage tank 3.

[0019] In this embodiment, the storage tank 3 is symmetrically and fixedly provided with annular supports 11 at both ends. An inner liner 9 is fixedly installed inside the annular supports 11. An insulation layer 10 is fixedly installed between the inner liner 9 and the inner wall of the storage tank 3. An inlet and an outlet are fixedly connected inside the inner liner 9 and one end of the storage tank 3. The inlet is located above the outlet. The gas dispenser 8 is fixedly installed on the top of the other end of the skid plate 1 at the position corresponding to the outlet and inlet. The insulation layer 10 can maintain the temperature of the liquefied natural gas inside the inner liner 9, which is convenient for storing liquefied natural gas. The gas dispenser 8 is provided for convenient gas dispensing.

[0020] In this embodiment, a compressor 6 is fixedly installed at the top of the condenser box 5. A suction pipe 7 is horizontally fixedly installed inside the top of the inner liner 9. An air hole is opened at the bottom of the inner end of the suction pipe 7. The outer end of the suction pipe 7 is fixedly connected to the inlet of the compressor 6. A longitudinal groove 23 is opened inside one end of the first connecting box 19. The outlet of the compressor 6 is fixedly connected to the longitudinal groove 23 through a connecting pipe. A connecting groove 24 is opened in a matrix inside the other end of the first connecting box 19. A connecting groove 24 is opened inside one end of the second connecting box 22. A connecting pipe 20 is fixedly connected between the longitudinal groove 23 and the bottom connecting groove 24, and between the top connecting groove 24 and the bottom connecting groove 24. The connecting pipe 20 on the right side is fixedly connected to the collection box 13. A heat-conducting plate 21 is fixedly installed on the outside of the connecting pipe 20. A delivery pump 15 is fixedly installed on one side of the outer wall of the condenser box 5. The inlet of 5 is fixedly connected to the collection box 13 through a connecting pipe. A circulation pipe is fixedly installed inside the bottom of the inner tank 9. One end of the circulation pipe is fixedly connected to the outlet of the delivery pump 15. The top and bottom of the same side of the condensing box 5 are respectively fixedly connected to the water outlet 17 and the water inlet 18. The compressor 6 draws BOG gas from the inside of the inner tank 9 through the suction pipe 7 and compresses it. The compressed BOG gas has a high temperature and can be sent into the first connecting box 19 and the longitudinal groove 23, and then diverted into the connecting pipe 20. The BOG gas flows inside the condensing box 5 through the connecting pipe 20 and the connecting groove 24, so that the BOG gas can fully contact the cold water. This facilitates the condensation and liquefaction of the BOG gas through the cooperation of the connecting pipe 20 and the heat conduction plate 21. Finally, it is discharged into the collection box 13 to collect the reliquefied natural gas. The delivery pump 15 can discharge the reliquefied natural gas into the storage tank 3 for reuse.

[0021] When using this LNG skid-mounted refueling unit for LNG refueling stations, the refueling machine 8 is fixedly connected to the high-pressure cryogenic pump via a pipeline, and the low-pressure high-temperature pump is fixedly connected to the outlet of the storage tank 3 via a tank booster vaporizer, facilitating refueling via the refueling machine 8. Pressure gauges and level gauges are installed on the storage tank 3 to monitor the LNG level inside. When the compressor 6 pressure is low, a suction pump or similar device can be installed between the compressor 6 and the suction pipe 7 to send BOG gas from the top of the inner liner 9 into the compressor 6. The compressor 6 compresses the BOG gas, increasing its temperature. The compressor 6 then sends the compressed BOG gas into the first connecting box 19 and the longitudinal groove 23. Multiple connecting pipes 20 divert the compressed BOG gas into the subsequent connecting groove 24. The compressed BOG gas is brought into full contact with cold water. The connection pipe 20 and the heat-conducting plate 21 facilitate condensation and liquefaction of the BOG gas. A drain pipe is located at the bottom of the bottom connecting trough 24, with its bottom end positioned inside the collection tank 13. A solenoid valve is installed on the drain pipe. After reliquefaction, the natural gas flows through the drain pipe and the connection pipe 20 into the collection tank 13. The collection tank 13 facilitates the collection of the reliquefied natural gas and maintains its original form. Finally, the reliquefied natural gas is pumped by the delivery pump 15 into the storage tank 3 for reuse. This eliminates the need for BOG gas storage, improving the safety and practicality of the gas filling device. The protective cover 4 enhances the protection of the storage tank 3, slows down its corrosion rate, and extends its service life.

[0022] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An LNG skid-mounted refueling device for an LNG refueling station, comprising a skid plate (1) and a storage tank (3), a protective cover (4), a condensate box (5), and a refueling machine (8) mounted on its top, characterized in that, Supports (2) are fixedly installed between the bottom of both ends of the storage tank (3) and the top of the skid plate (1). The protective cover (4) is installed on the top of the storage tank (3) by a support rod (25) and a fixing block (16). The condenser (5) is fixedly installed on the top of one end of the skid plate (1). The condenser (5) is fixedly installed with a condensing mechanism (12) and a collection box (13) from top to bottom inside. The condensing mechanism (12) includes a first connecting box (19), a second connecting box (22), a connecting pipe (20), and a heat-conducting plate (21). The collection box (13) and the first connecting box (19) are fixedly installed on the bottom and top of the inner side of the condenser (5), respectively. The second connecting box (22) is fixedly installed on the top of the collection box (13). The connecting pipe (20) is fixedly connected between the first connecting box (19) and the second connecting box (22). One end of the collection box (13) is fixedly connected to an exhaust pipe (14).

2. The LNG skid-mounted refueling device for an LNG refueling station according to claim 1, characterized in that: The support rod (25) is symmetrically fixed at the bottom of both ends of the protective cover (4). The protective cover (4) is U-shaped. The bottom end of the support rod (25) is fixedly connected to the top of the support (2). The fixing block (16) is symmetrically fixed between the top of the storage tank (3) and the inner top wall of the protective cover (4).

3. The LNG skid-mounted refueling device for LNG refueling stations according to claim 1, characterized in that: The storage tank (3) is symmetrically fixed with annular supports (11) at both ends. An inner liner (9) is fixedly installed inside the annular support (11). An insulation layer (10) is fixedly installed between the inner liner (9) and the inner wall of the storage tank (3).

4. The LNG skid-mounted refueling device for an LNG refueling station according to claim 3, characterized in that: The inner liner (9) and the storage tank (3) are internally connected to a liquid inlet and a liquid outlet. The liquid inlet is located above the liquid outlet. The gas dispenser (8) is fixedly installed on the top of the other end of the skid plate (1) at the position corresponding to the liquid outlet and the liquid inlet.

5. The LNG skid-mounted refueling device for an LNG refueling station according to claim 4, characterized in that: A compressor (6) is fixedly installed at the top of the condenser (5), and an air extraction pipe (7) is fixedly installed horizontally inside the top of the inner liner (9). An air hole is opened at the bottom of the inner end of the air extraction pipe (7), and the outer end of the air extraction pipe (7) is fixedly connected to the inlet of the compressor (6).

6. The LNG skid-mounted refueling device for an LNG refueling station according to claim 5, characterized in that: The first connecting box (19) has a longitudinal groove (23) inside one end. The compressor (6) is fixedly connected to the longitudinal groove (23) through a connecting pipe. The other end of the first connecting box (19) has a connecting groove (24) in a matrix. The heat-conducting plate (21) is fixedly installed on the connecting pipe (20).

7. The LNG skid-mounted refueling device for an LNG refueling station according to claim 6, characterized in that: The second connecting box (22) has a connecting groove (24) inside one end. The connecting pipe (20) is fixedly connected between the longitudinal groove (23) and the bottom connecting groove (24), and between the top connecting groove (24) and the bottom connecting groove (24). The connecting pipe (20) on the right side is fixedly connected to the collection box (13). The heat-conducting plate (21) is fixedly installed on the outside of the connecting pipe (20).

8. The LNG skid-mounted refueling device for an LNG refueling station according to claim 7, characterized in that: A delivery pump (15) is fixedly installed on one side of the outer wall of the condenser (5). The inlet of the delivery pump (15) is fixedly connected to the collection box (13) through a connecting pipe. A circulation pipe is fixedly installed inside the bottom of the inner liner (9). One end of the circulation pipe is fixedly connected to the outlet of the delivery pump (15). The top and bottom of the same side of the condenser (5) are respectively fixedly connected to the water outlet (17) and the water inlet (18).

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