Double-pipe parallel liquid supply system for LNG (Liquefied Natural Gas) filling

Abstract

A double-pipe parallel liquid supply system for LNG filling comprises a storage tank, a pump pool, a liquid conveying pipeline and a liquid conveying control unit, the storage tank is connected with the pump pool through the liquid conveying pipeline, the liquid conveying pipeline is connected with the liquid conveying control unit, and the liquid conveying control unit is used for controlling the flow of the liquid conveying pipeline; and the infusion pipeline is a double-tube parallel infusion tube. According to the utility model, a double-path liquid inlet pipe design is adopted, so that the effective drift diameter of the pipeline is directly increased. Compared with a single-pipe system, the double-pipe system can allow more LNG fluid to pass through, so that the liquid inlet capacity and the liquid inlet amount are remarkably improved. The lifting is crucial to an LNG filling station because the filling time can be shortened and the filling efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of gas station infusion, especially relates to a double-pipe parallel liquid supply system for LNG filling. BACKGROUND

[0002] In the process system of the LNG gas station, the storage tank and the pump pool need to be connected by a section of pipeline to realize liquid supply, and the diameter of the connecting pipeline is usually small (less than DN65), which leads to poor flow of the pump pool liquid supply pipeline, and the liquid inlet speed of the pump pool of the gas station cannot meet the flow requirement of the submersible pump, thereby causing the submersible pump to cavitate and be evacuated, and the submersible pump cannot work. These problems seriously affect the normal operation of the gas station equipment, and increasing the pipeline needs to replace the storage tank and the pump pool, which causes huge economic losses and waste.

[0003] The existing LNG storage tank is a double-layer vacuum insulation structure, which is long in volume, complex in structure and high in cost. The LNG storage tank is a pressure container and belongs to special equipment, and the structure cannot be easily changed. The design pipe diameter of the liquid outlet pipeline of the storage tank itself is small, and the effect of thickening the external connecting pipeline is not great. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a double-pipe parallel liquid supply system for LNG filling to solve the above problems.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A double-pipe parallel liquid supply system for LNG filling, comprising a storage tank, a pump pool, a liquid supply pipeline and a liquid supply control unit, the storage tank is connected to the pump pool through the liquid supply pipeline, the liquid supply control unit is connected to the liquid supply pipeline, and the liquid supply control unit is used for controlling the flow of the liquid supply pipeline; the liquid supply pipeline is a double-pipe parallel liquid supply pipeline.

[0007] Further, the liquid supply pipeline comprises a first liquid supply pipe, a second liquid supply pipe and two pneumatic stop valves, one end of the first liquid supply pipe and the second liquid supply pipe is communicated with the storage tank, and the other end is communicated with the pump pool, and one pneumatic stop valve is arranged on the first liquid supply pipe and the second liquid supply pipe respectively.

[0008] Further, the liquid supply control unit is connected to the two pneumatic stop valves.

[0009] Further, the liquid supply control unit comprises a pneumatic electromagnetic valve and a gas station automatic control cabinet, the pneumatic electromagnetic valve is installed on the pipeline communicated with the pneumatic stop valve, and the pneumatic electromagnetic valve is connected to the gas station automatic control cabinet.

[0010] Further, the number of the pneumatic electromagnetic valves is one or two.

[0011] Further, when the pneumatic electromagnetic valve is one, the two pneumatic stop valves are connected to the pneumatic electromagnetic valve.

[0012] Further, when two pneumatic electromagnetic valves are installed, the two pneumatic electromagnetic valves are connected to the pneumatic stop valve in parallel.

[0013] Further, the pipeline diameter of the infusion pipeline is DN25-DN65; a gas return pipe is further arranged between the storage tank and the pump pool.

[0014] Further, the two ends of the infusion pipeline are connected to the storage tank and the pump pool through flanges or welding.

[0015] Further, a large-radius elbow is used at the elbow of the infusion pipeline.

[0016] Compared with the prior art, the utility model has the following technical effects:

[0017] The utility model adopts double-way liquid inlet pipe design, which directly increases the effective diameter of the pipeline. Compared with the single-pipe system, the double-pipe system can accommodate more LNG fluid, thereby significantly improving the liquid inlet capacity and liquid inlet amount. This improvement is crucial for LNG filling stations, as it can shorten the filling time and improve the filling efficiency.

[0018] Because the double-pipe system provides greater flow and more stable liquid flow, the submersible pump is less likely to have problems such as emptying, cavitation, and idling during operation. These problems often lead to pump damage and efficiency decline, but the double-pipe system effectively reduces these risks and prolongs the service life of the submersible pump.

[0019] The two pipelines in the technical solution are synchronously controlled, which means that during operation, the state (such as opening or closing) of the two pipelines always remains consistent. This synchronous control design prevents abnormal operation of a single pipeline due to misoperation, thereby improving the safety of the entire system.

[0020] At the elbow of the infusion pipeline, the technical solution uses a large-radius elbow. This design reduces the flow resistance of the fluid at the elbow, allowing LNG to flow more smoothly through the pipeline and improving the flow efficiency of the fluid.

[0021] The technical solution does not require replacement of the storage tank, which greatly reduces the investment cost of the system. At the same time, due to the relatively simple construction and strong operability, the installation and debugging period of the entire system is also relatively short. This means that users can see the actual effect and economic benefit of the system faster.

[0022] In summary, the technical solution of this LNG refueling dual-pipe parallel supply system, through a series of design and improvements, achieves multiple technical benefits, including enhanced inlet capacity, prevention of submersible pump problems, improved safety, reduced flow resistance, reduced investment, and simplified construction. These benefits collectively improve the operational efficiency and economic benefits of LNG refueling stations, providing strong technical support for the development of the LNG refueling industry. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0025] in:

[0026] 1. Storage tank; 2. Pump pool; 3. First infusion pipe; 4. Second infusion pipe; 5. Pneumatic shut-off valve; 6. Pneumatic solenoid valve; 7. Automatic control cabinet of gas station; 8. Return gas pipe. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Example 1: This utility model provides a dual-pipe parallel liquid supply system for LNG refueling, including a storage tank 1, a pump pool 2, a liquid delivery pipeline and a liquid delivery control unit. The storage tank 1 is connected to the pump pool 2 through the liquid delivery pipeline, and the liquid delivery control unit is connected to the liquid delivery pipeline. The liquid delivery control unit is used to control the flow rate of the liquid delivery pipeline. The liquid delivery pipeline is a dual-pipe parallel liquid delivery pipeline.

[0031] The infusion pipeline includes a first infusion pipe 3, a second infusion pipe 4, and two pneumatic shut-off valves 5. One end of the first infusion pipe 3 and the second infusion pipe 4 are connected to the storage tank 1, and the other end is connected to the pump pool 2. A pneumatic shut-off valve 5 is installed on the first infusion pipe 3 and the second infusion pipe 4 respectively.

[0032] The infusion control unit is connected to two pneumatic shut-off valves 5.

[0033] The infusion control unit includes a pneumatic solenoid valve 6 and a gas station automatic control cabinet 7. The pneumatic solenoid valve 6 is installed on the pipeline connected to the pneumatic shut-off valve 5 and is connected to the gas station automatic control cabinet 7.

[0034] When one pneumatic solenoid valve 6 is installed, both pneumatic shut-off valves 5 are connected to the pneumatic solenoid valve 6.

[0035] The infusion pipeline has a diameter of DN25-DN65. A return gas pipe 8 is also installed between storage tank 1 and pump pool 2.

[0036] The two ends of the infusion pipeline are connected to the storage tank 1 and the pump pool 2 by flanges or welding.

[0037] Large-radius elbows are used at bends in the infusion tubing.

[0038] Example 2: This utility model provides a dual-pipe parallel liquid supply system for LNG refueling, including a storage tank 1, a pump pool 2, a liquid delivery pipeline and a liquid delivery control unit. The storage tank 1 is connected to the pump pool 2 through the liquid delivery pipeline, and the liquid delivery control unit is connected to the liquid delivery pipeline. The liquid delivery control unit is used to control the flow rate of the liquid delivery pipeline; the liquid delivery pipeline is a dual-pipe parallel liquid delivery pipeline.

[0039] The infusion pipeline includes a first infusion pipe 3, a second infusion pipe 4, and two pneumatic shut-off valves 5. One end of the first infusion pipe 3 and the second infusion pipe 4 are connected to the storage tank 1, and the other end is connected to the pump pool 2. A pneumatic shut-off valve 5 is installed on the first infusion pipe 3 and the second infusion pipe 4 respectively.

[0040] The infusion control unit is connected to two pneumatic shut-off valves 5.

[0041] The infusion control unit includes a pneumatic solenoid valve 6 and a gas station automatic control cabinet 7. The pneumatic solenoid valve 6 is installed on the pipeline connected to the pneumatic shut-off valve 5 and is connected to the gas station automatic control cabinet 7.

[0042] When two pneumatic solenoid valves 6 are installed, the two pneumatic solenoid valves 6 are connected in parallel and then connected to the pneumatic shut-off valve 5 respectively.

[0043] The infusion pipeline has a diameter of DN25-DN65. A return gas pipe 8 is also installed between storage tank 1 and pump pool 2.

[0044] The two ends of the infusion pipeline are connected to the storage tank 1 and the pump pool 2 by flanges or welding.

[0045] Large-radius elbows are used at bends in the infusion tubing.

[0046] The technical solution eliminates the need to replace the storage tank, significantly reducing the system's initial investment cost. Furthermore, due to its relatively simple construction and high operability, the overall installation and commissioning cycle is also shorter. This means users can see the system's actual effects and economic benefits more quickly.

[0047] In summary, the technical solution of this LNG refueling dual-pipe parallel supply system, through a series of design and improvements, achieves multiple technical benefits, including enhanced inlet capacity, prevention of submersible pump problems, improved safety, reduced flow resistance, reduced investment, and simplified construction. These benefits collectively improve the operational efficiency and economic benefits of LNG refueling stations, providing strong technical support for the development of the LNG refueling industry.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A parallel double pipe liquid supply system for LNG filling, characterized by, The infusion pipeline comprises a storage tank (1), a pump pool (2), an infusion pipeline and an infusion control unit, the storage tank (1) is connected with the pump pool (2) through the infusion pipeline, the infusion pipeline is connected with the infusion control unit, and the infusion control unit is used for controlling the flow of the infusion pipeline; the infusion pipeline is a double-pipeline parallel infusion pipeline.

2. The dual pipe parallel liquid supply system for LNG filling according to claim 1, characterized in that, The infusion pipeline comprises a first infusion pipeline (3), a second infusion pipeline (4) and two pneumatic stop valves (5), one end of the first infusion pipeline (3) and the second infusion pipeline (4) is communicated with the storage tank (1), and the other end is communicated with the pump pool (2), and one pneumatic stop valve (5) is arranged on the first infusion pipeline (3) and the second infusion pipeline (4) respectively.

3. The LNG dual pipe parallel liquid supply system according to claim 2, characterized in that, The infusion control unit is connected with the two pneumatic stop valves (5).

4. The dual pipe parallel liquid supply system for LNG refilling according to claim 1, characterized in that, The infusion control unit comprises a pneumatic electromagnetic valve (6) and a gas station automatic control cabinet (7), the pneumatic electromagnetic valve (6) is installed on the pipeline communicated with the pneumatic stop valve (5), and the pneumatic electromagnetic valve (6) is connected with the gas station automatic control cabinet (7).

5. The LNG dual pipe parallel liquid supply system according to claim 4, characterized in that, The pneumatic electromagnetic valve (6) is one or two in number.

6. The LNG dual pipe parallel liquid supply system according to claim 5, wherein, When the pneumatic electromagnetic valve (6) is one, the two pneumatic stop valves (5) are connected with the pneumatic electromagnetic valve (6).

7. The LNG dual pipe parallel liquid supply system according to claim 5, wherein, When the pneumatic electromagnetic valve (6) is two, the two pneumatic electromagnetic valves (6) are connected with the pneumatic stop valves (5) respectively after being connected in parallel.

8. The dual pipe parallel liquid supply system for LNG refilling according to claim 1, characterized in that, The pipeline diameter of the infusion pipeline is DN25-DN65; a gas return pipeline (8) is further arranged between the storage tank (1) and the pump pool (2).

9. The dual pipe parallel liquid supply system for LNG refilling according to claim 1, characterized in that, The two ends of the infusion pipeline are connected with the storage tank (1) and the pump pool (2) through flanges or welding.

10. The dual pipe parallel liquid supply system for LNG refilling according to claim 1, characterized in that, The elbow of the infusion pipeline adopts an elbow with a large bending radius.

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