Novel gas station of centrifugal pump

Abstract

The utility model provides a novel gas station with a centrifugal pump, which relates to the technical field of liquefied natural gas filling machines and comprises a support table, a storage tank arranged on the surface of the support table, a liquid inlet pipe arranged at the bottom of the storage tank, a liquid outlet pipe arranged at the bottom of the storage tank, the centrifugal pump connected to the end of the liquid outlet pipe, and a liquid discharge pipe connected to the output end of the centrifugal pump. The novel design of the centrifugal pump is adopted, the centrifugal pump does not need a pump pool structure, so that the government supervision burden and corresponding fund expenditure are relieved, meanwhile, only a liquid phase pipeline is arranged from the storage tank to the centrifugal pump, a gas phase pipeline is not needed, the pipeline is simplified, the construction time can be shortened, the pipeline cold leakage situation can be reduced, and vertical liquid outlet of the storage tank is achieved by optimizing the design of the liquid outlet pipe; the design structure is compact, the size of the cofferdam can be controlled to be 8 * 8 meters, investment cost can be saved for customers due to the fact that the cofferdam is reduced, the height of a storage tank operation valve is reduced due to the adoption of the structure, manufacturing of a field operation platform is reduced, and cost is saved for the customers.

Description

Technical Field

[0001] The utility model relates to the technical field of liquefied natural gas dispensers, in particular to a new type of centrifugal pump gas filling station. Background Art

[0002] As a special industry, an LNG filling station is a place for refueling vehicles using liquefied natural gas as fuel. The existing equipment in a conventional LNG filling station includes a storage tank and a submersible pump skid inside the cofferdam, and an LNG dispenser outside the cofferdam. The submersible pump skid inside the cofferdam of the conventional LNG filling station contains a submersible pump pool as a pressure vessel, a submersible pump, and various pipelines inside the skid. The submersible pump pool includes a liquid inlet, a gas phase port, a liquid outlet, a sewage outlet, and a safety relief port.

[0003] An LNG filling station disclosed in Chinese Patent No. CN209856762U includes a storage tank for storing LNG, a liquid unloading hose, and a gas purging assembly. Among them, the liquid unloading hose is used to connect the storage tank and the LNG tank truck. The liquid unloading hose has a pressure relief port. The gas purging assembly includes an inflation bottle, a ventilation pipe communicated with the inflation bottle, and a purging control valve corresponding to the pressure relief port. The inflation bottle is filled with a protective gas. The ventilation pipe is butted and communicated with the liquid unloading hose, so that the liquid unloading hose is filled with the protective gas. Before the tank truck unloads liquid, the purging control valve controls the pressure relief port to open, so that the protective gas is discharged through the pressure relief port and purges the liquid unloading hose. The above gas purging assembly uses a protective gas for purging the liquid unloading hose, avoiding potential safety hazards, improving the liquid unloading operation efficiency, and reducing the maintenance and management burden of the staff.

[0004] The following technical problems exist in the above comparative document and the prior art:

[0005] 1. Currently, the existing centrifugal pump gas filling station inside the cofferdam includes a storage tank and a pump skid. The pump skid further includes a pump pool, a submersible pump, and its control pipelines, etc. Relatively speaking, there are many pipelines and the structure is complex. The size of the cofferdam is relatively large, generally 8 * 11 meters. The manufacture of the on-site operation platform is troublesome, time-consuming, and laborious, and the investment cost is relatively high. Content of the Utility Model

[0006] The purpose of the utility model is to solve the deficiencies in the prior art and propose a new type of centrifugal pump gas filling station.

[0007] To achieve the above object, the utility model adopts the following technical scheme: A gas filling station of a new type of centrifugal pump, including a support platform, on the surface of the support platform is provided a storage tank, at the bottom of the storage tank is provided a liquid inlet pipe, at the bottom of the storage tank is provided a liquid outlet pipe, the end of the liquid outlet pipe is connected to a centrifugal pump, the output end of the centrifugal pump is connected to a liquid discharge pipe, the bottom of the storage tank is connected to a pressurizing pipe, the end of the pressurizing pipe is connected to a combined pressurizing and venting vaporizer, the surface of the liquid inlet pipe is connected to a first liquid unloading pipe, and on the surface of the support platform is provided an independent liquid unloading assembly.

[0008] Preferably, the independent liquid unloading assembly includes an independent liquid unloading pressurizing device, a second liquid unloading pipe and a second liquid unloading valve. The surface of the independent liquid unloading pressurizing device is connected to the second liquid unloading pipe, and on the surface of the second liquid unloading pipe is provided the second liquid unloading valve.

[0009] Preferably, on the surface of the support platform are provided support columns, and the top of the support columns is connected to the bottom of the storage tank.

[0010] Preferably, on the surface of the liquid discharge pipe is provided a first control valve, and on the surface of the liquid inlet pipe is provided a second control valve.

[0011] Preferably, on the surface of the pressurizing pipe is provided a third control valve, and on the surface of the first liquid unloading pipe is provided a first liquid unloading valve.

[0012] Preferably, the surface of the combined pressurizing and venting vaporizer is connected to a third liquid unloading pipe, and the surface of the third liquid unloading pipe is connected to the first liquid unloading valve.

[0013] Preferably, there are two first liquid unloading pipes arranged axially symmetrically, and there are two groups of centrifugal pumps and liquid outlet pipes arranged axially symmetrically.

[0014] Beneficial effects

[0015] In the utility model, a new design of a centrifugal pump is adopted. This centrifugal pump does not require a pump pit structure, reducing the use of the pump pit as a pressure vessel, thereby reducing the government supervision burden and corresponding capital expenditure. At the same time, there is only a liquid phase pipeline from the storage tank to the centrifugal pump without a gas phase pipeline, simplifying the pipeline part from the storage tank to the skid. The pipeline simplification can shorten the construction time, reduce the investment cost for customers, and also reduce the pipeline cold leakage situation. And the structure of this gas filling station can achieve storage tank pressurization, truck unloading pressurization and venting heating through the combined pressurizing and venting vaporizer. At the same time, an independent truck unloading can be added and two truck unloading points can be operated through the combined pressurizing and venting vaporizer, enhancing the operation efficiency and flexibility. By optimizing the design of the liquid outlet pipe, vertical liquid outlet from the storage tank is realized, effectively reducing the pipeline resistance. This design structure is compact, and the size of the cofferdam can be controlled within 8*8 meters. The reduction of the cofferdam can save investment cost for customers. And the use of this structure reduces the height of the storage tank operation valve and reduces the manufacture of the on-site operation platform, saving cost for customers. Description of the Drawings

[0016] Figure 1 is the front view of the present utility model;

[0017] Figure 2 is the rear view of the present utility model;

[0018] Figure 3 is the top view of the present utility model;

[0019] Figure 4 is the structural diagram of the present utility model.

[0020] Legend:

[0021] 1. Storage tank; 2. Centrifugal pump; 3. Drain pipe; 4. Inlet pipe; 5. Outlet pipe; 6. Boost pipe; 7. Boost and vent combined vaporizer; 8. First liquid discharge pipe; 9. Independent liquid discharge assembly; 901. Independent liquid discharge boosting device; 902. Second liquid discharge pipe; 903. Second liquid discharge valve; 10. Support platform; 11. Support column; 12. First control valve; 13. Second control valve; 14. Third control valve; 15. First liquid discharge valve; 16. Third liquid discharge pipe. Detailed Embodiments

[0022] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments and the drawings. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work all fall within the protection scope of the present utility model.

[0023] The specific embodiments of the present utility model will be described below in conjunction with the drawings. Specific Embodiment 1:

[0025] Refer to Figures 1-4, A gas filling station for a new type of centrifugal pump, including a support platform 10, which serves as the basic structure of the entire gas filling station and is used to support and fix key components such as the storage tank 1, support columns 11, and centrifugal pump 2, ensuring their stability and safety. The surface of the support platform 10 is provided with a storage tank 1 for storing liquid media (such as liquefied natural gas, etc.), which is the core storage device of the gas filling station. The surface of the support platform 10 is provided with support columns 11, and the top of the support column 11 is connected to the bottom of the storage tank 1. The bottom of the storage tank 1 is provided with a liquid inlet pipe 4, which is connected to an external liquid supply system and the storage tank 1 through the liquid inlet pipe 4 for inputting liquid media into the storage tank 1. The surface of the liquid inlet pipe 4 is provided with a second control valve 13, and the second control valve 13 controls the opening and closing of the liquid inlet pipe 4 to adjust or stop the input of the media when needed. The bottom of the storage tank 1 is provided with a liquid outlet pipe 5, which is connected to the storage tank 1 and the centrifugal pump 2 through the liquid outlet pipe 5 to transport the liquid media in the storage tank 1 to the centrifugal pump 2 for pressurization treatment. The end of the liquid outlet pipe 5 is connected to a centrifugal pump 2. The centrifugal pump 2 does not require a pump pool structure, reducing the use of the pump pool as a pressure vessel, thereby reducing the government supervision burden and corresponding capital expenditure. There are two groups of the centrifugal pump 2 and the liquid outlet pipe 5 arranged axially symmetrically. The liquid pipe 5 is designed perpendicular to the storage tank 1 to achieve vertical liquid discharge from the storage tank 1, effectively reducing the pipeline resistance. At the same time, there is only a liquid phase pipeline from the storage tank 1 to the centrifugal pump 2 without a gas phase pipeline, simplifying the pipeline part from the storage tank 1 to the skid. The output end of the centrifugal pump 2 is connected to a liquid discharge pipe 3. The low-temperature liquid in the storage tank 1 is pumped out and pressurized by the centrifugal pump 2 and transported to downstream equipment or systems through the liquid discharge pipe 3. The surface of the liquid discharge pipe 3 is provided with a first control valve 12, and the first control valve 12 is used to control the output flow rate and opening and closing state of the media.

[0026] The bottom of the storage tank 1 is connected to a pressurization pipe 6. The surface of the pressurization pipe 6 is provided with a third control valve 14, which is connected to the storage tank 1 and the pressurization and relief combined vaporizer 7. Through the setting of the pressurization pipe 6 and the pressurization and relief combined vaporizer 7, when the pressure in the storage tank 1 is lower than the set value, the third control valve 14 automatically opens, and LNG enters the pressurization and relief combined vaporizer 7 through the pressurization pipe 6 for gasification, and then the gaseous natural gas is injected into the storage tank 1 to increase the pressure. This process can ensure the continuous stability of the pressure in the storage tank 1 and avoid gas supply interruption caused by too low pressure. The end of the pressurization pipe 6 is connected to a pressurization and relief combined vaporizer 7. The surface of the pressurization and relief combined vaporizer 7 is connected to a third liquid discharge pipe 16, and the surface of the third liquid discharge pipe 16 is connected to a first liquid discharge valve 15. Through the setting of the pressurization and relief combined vaporizer 7, the pressurization of the storage tank 1, the pressurization of the unloading vehicle, and the relief heating are realized. At the same time, in cooperation with the first liquid discharge pipe 8 and the third liquid discharge pipe 16, an independent unloading vehicle can be added, and two unloading points can be operated through the pressurization and relief combined vaporizer 7.

[0027] A first liquid discharge pipe 8 is connected to the surface of the liquid inlet pipe 4. A first liquid discharge valve 15 is provided on the surface of the first liquid discharge pipe 8. There are two first liquid discharge pipes 8 arranged axially symmetrically. Through the arrangement of the first liquid discharge pipe 8, after pressurization is completed, the valve on the first liquid discharge pipe 8 is opened to allow the liquid to flow from the tank truck into the storage tank 1. An independent liquid discharge assembly 9 is provided on the surface of the support table 10. The independent liquid discharge assembly 9 includes an independent liquid discharge pressurization device 901, a second liquid discharge pipe 902, and a second liquid discharge valve 903. The second liquid discharge pipe 902 is connected to the surface of the independent liquid discharge pressurization device 901. The second liquid discharge valve 903 is provided on the surface of the second liquid discharge pipe 902. During the liquid discharge process, the LNG tank truck usually does not come with a pressurization system. Therefore, when discharging LNG from the tank truck into the storage tank 1, an external pressurization device needs to be used to increase the pressure in the tank truck. The second liquid discharge valve 903 is opened, and through the second liquid discharge pipe 902, the independent liquid discharge pressurization device 901 can provide additional pressurization capacity to ensure the smooth progress of the liquid discharge process.

[0028] Open the second control valve 13 to allow the external liquid supply system to input the liquid medium (LNG) into the storage tank 1 through the liquid inlet pipe 4. Open the first liquid discharge valve 15 and the second liquid discharge valve 903. Through the second liquid discharge pipe 902, the independent liquid discharge pressurization device 901 can provide additional pressurization capacity, so that when discharging LNG from the tank truck into the storage tank 1, during this process, the LNG is introduced into the storage tank 1 through the first liquid discharge pipe 8 and the liquid inlet pipe 4. When all the LNG in the tank truck is completely discharged into the storage tank 1, close the corresponding valves. After confirming that the liquid outlet pipe 5 is unobstructed, start the centrifugal pump 2 and open the first control valve 12. The low-temperature liquid in the storage tank 1 is pumped out and pressurized by the centrifugal pump 2 and transported to the downstream equipment or system through the liquid discharge pipe 3. During the operation, when the pressure in the storage tank 1 is lower than the set value, the third control valve 14 automatically opens, and the LNG enters the pressurization and dispersion combined vaporizer 7 through the pressurization pipe 6 for gasification, and then the gaseous natural gas is injected into the storage tank 1 to increase the pressure. This process can ensure the continuous stability of the pressure in the storage tank 1 and avoid the interruption of gas supply caused by too low pressure. Moreover, the pressurization and dispersion combined vaporizer 7 cooperates with the first liquid discharge pipe 8 and the third liquid discharge pipe 16 to pressurize the unloading of the truck, so that an independent truck unloading can be added to realize the operation of two unloading points. Specific Embodiment 2:

[0030] On the premise of meeting the above structure, the centrifugal pump 2 can be integrated at the bottom of the storage tank 1 and installed as a whole, which can significantly improve the compactness and efficiency of the system, save space. This design not only reduces the number of pipeline connections and valves, reduces potential leakage points and failure points, but also reduces the resistance of the fluid during transportation, further ensuring the safe and efficient handling of liquid media (such as liquefied natural gas LNG). The integrated installation enhances the connection strength between the storage tank 1 and the centrifugal pump 2, reducing the risk of equipment loosening or damage caused by vibration or external impact, thereby improving the stability and reliability of the entire gas filling station system.

[0031] In summary:

[0032] 1. With the new design of the centrifugal pump 2, it is realized that the centrifugal pump 2 does not require a pump pit structure, reducing the use of the pump pit as a pressure vessel, thus reducing the government supervision burden and corresponding capital expenditure. At the same time, there is only a liquid-phase pipeline from the storage tank 1 to the centrifugal pump 2 and no gas-phase pipeline, simplifying the pipeline part from the storage tank 1 to the skid. The pipeline simplification can shorten the construction time, reduce the investment cost for customers, and also reduce the pipeline cold leakage situation. Moreover, the structure of this gas filling station can achieve the pressurization of the storage tank 1, the unloading pressurization, and the heating of the relief through the pressurization and relief combined vaporizer 7. At the same time, an independent unloading can be added and the operation of two unloading points can be realized through the pressurization and relief combined vaporizer 7, enhancing the operation efficiency and flexibility. By optimizing the design of the liquid outlet pipe 5, the vertical liquid outlet of the storage tank 1 is realized, effectively reducing the pipeline resistance. The design is compact, and the size of the cofferdam can be controlled within 8 * 8 meters. The reduction of the cofferdam can save the investment cost for customers, and the use of this structure reduces the height of the operation valves of the storage tank 1 and reduces the manufacture of the on-site operation platform, saving costs for customers.

[0033] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0034] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A novel centrifugal pump filling station, comprising a support platform (10), characterized in that: A storage tank (1) is provided on the surface of the support platform (10), a liquid inlet pipe (4) is provided at the bottom of the storage tank (1), a liquid outlet pipe (5) is provided at the bottom of the storage tank (1), the end of the liquid outlet pipe (5) is connected to a centrifugal pump (2), the output end of the centrifugal pump (2) is connected to a liquid discharge pipe (3), a boosting pipe (6) is connected to the bottom of the storage tank (1), the end of the boosting pipe (6) is connected to a boosting and release combined vaporizer (7), the surface of the liquid inlet pipe (4) is connected to a first liquid discharge pipe (8), an independent liquid discharge assembly (9) is provided on the surface of the support platform (10), the independent liquid discharge assembly (9) comprises an independent liquid discharge boosting device (901), a second liquid discharge pipe (902) and a second liquid discharge valve (903), the surface of the independent liquid discharge boosting device (901) is connected to the second liquid discharge pipe (902), and the surface of the second liquid discharge pipe (902) is provided with a second liquid discharge valve (903).

2. A new type of centrifugal pump gas filling station according to claim 1, characterized in that: A support column (11) is provided on the surface of the support platform (10), and the top of the support column (11) is connected to the bottom of the storage tank (1).

3. A new type of centrifugal pump gas filling station according to claim 1, characterized in that: A first control valve (12) is provided on the surface of the liquid discharge pipe (3), and a second control valve (13) is provided on the surface of the liquid inlet pipe (4).

4. A new type of centrifugal pump gas filling station according to claim 1, characterized in that: A third control valve (14) is provided on the surface of the boosting pipe (6), and a first liquid discharge valve (15) is provided on the surface of the first liquid discharge pipe (8).

5. A new type of centrifugal pump gas filling station according to claim 4, characterized in that: The surface of the pressurizing and releasing combined vaporizer (7) is connected to a third liquid discharge pipe (16), and the surface of the third liquid discharge pipe (16) is connected to the first liquid discharge valve (15).

6. A new type of centrifugal pump gas filling station according to claim 1, characterized in that: The first liquid discharge pipes (8) are arranged in two axially symmetrical arrangements, and the centrifugal pumps (2) and liquid discharge pipes (5) are arranged in two axially symmetrical arrangements.

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