LNG booster pump control test system

Abstract

The utility model relates to the technical field of LNG booster pumps, in particular to an LNG booster pump control test system. Comprising an LNG storage tank and an LNG booster pump, an oil inlet and an oil outlet of the driving end of the LNG booster pump are connected with an oil tank through pipelines, a reversing valve and a bypass valve, an oil pump is arranged on the pipeline close to the oil tank, and a temperature sensor TT1 is arranged in the oil tank; an exhaust port of the LNG booster pump is connected with the vaporizer through a pipeline, a one-way valve and a switch valve, the vaporizer is connected with the buffer tank through a pipeline and a safety stop valve, a temperature sensor TT2 is arranged on the safety stop valve, a temperature sensor TT3 and a pressure sensor PT are arranged on the buffer tank, and a flow meter FIQ is arranged on a pipeline on the front side of the buffer tank. The gas displacement of the LNG booster pump in unit time is detected through the flow meter FIQ, the actual working environment of the LNG booster pump is simulated, performance detection can be conducted on the LNG booster pump before delivery, the later-stage quality stability of the LNG booster pump is guaranteed, and the later-stage maintenance workload is reduced.

Description

Technical fields:

[0001] This utility model relates to the field of LNG booster pump technology, and in particular to an LNG booster pump control and testing system. Background technology:

[0002] LNG, or liquefied natural gas, is produced by cooling gaseous natural gas at atmospheric pressure to -162°C, causing it to condense into a liquid to save storage and transportation space. Currently, it is generally stored in onboard cryogenic cylinders. In use, a booster pump first pumps LNG from the cylinder, then it is vaporized to form high-pressure natural gas for vehicle use. Current LNG booster pumps, as disclosed in patent application CN118188386A, require testing of their boosting performance after manufacturing to determine their quality. However, there is currently no dedicated system for testing LNG booster pumps; they are typically shipped directly to the factory and then repaired based on actual usage. This results in poor quality stability, high maintenance workload, and negative market feedback. There is currently no good solution to these problems.

[0003] In summary, the issue of testing the pressurization performance of LNG booster pumps before they leave the factory has become a technical challenge that urgently needs to be addressed in the industry. Utility model content:

[0004] To overcome the shortcomings of existing technologies, this utility model provides an LNG booster pump control and testing system, which solves the problem of poor quality stability in the later stages caused by the lack of a dedicated testing system for LNG booster pumps before they leave the factory.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] An LNG booster pump control and testing system includes an LNG storage tank and an LNG booster pump. The boosting end of the LNG booster pump is located inside the LNG storage tank, while the driving end of the LNG booster pump is located outside the LNG storage tank. The inlet and outlet of the driving end of the LNG booster pump are connected to an oil tank via pipelines, a reversing valve, and a bypass valve. An oil pump is installed on the pipeline near the oil tank, and a temperature sensor TT1 is installed inside the oil tank. The exhaust port of the LNG booster pump is connected to a vaporizer via pipelines, a check valve, and a switching valve. The vaporizer is then connected to a buffer tank via pipelines and a safety shut-off valve. A temperature sensor TT2 is installed on the safety shut-off valve, and a temperature sensor TT3 and a pressure sensor PT are installed on the buffer tank. A flow meter FIQ is installed on the pipeline in front of the buffer tank.

[0007] The LNG storage tank is equipped with a level gauge.

[0008] A fan is installed on one side of the fuel tank.

[0009] The vaporizer is connected to a water pump and an electric water heater via pipelines.

[0010] The present invention adopts the above solution and has the following advantages:

[0011] The LNG booster pump is controlled to start and stop intermittently by using temperature sensors TT1, TT2, TT3, and pressure sensor PT. The flow rate FIQ is used to detect the pump's discharge volume per unit time. If the discharge volume meets the required value, the LNG booster pump is considered to have stable performance and meets factory requirements. If the discharge volume is lower than the required value, the LNG booster pump has a defect and needs immediate repair until it meets the requirements before leaving the factory. This system simulates the actual working environment of the LNG booster pump, allowing for performance testing before delivery, ensuring the pump's long-term quality stability, and reducing subsequent maintenance workload. Attached image description:

[0012] Figure 1 This is a schematic diagram of the structural principle of this utility model.

[0013] In the diagram, 1. LNG storage tank, 2. LNG booster pump, 3. reversing valve, 4. bypass valve, 5. oil tank, 6. oil pump, 7. check valve, 8. on / off valve, 9. vaporizer, 10. safety shut-off valve, 11. buffer tank, 12. level gauge, 13. fan, 14. water pump, and 15. electric water heater. Detailed implementation method:

[0014] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0015] like Figure 1 As shown, an LNG booster pump control and testing system includes an LNG storage tank 1 and an LNG booster pump 2. The boosting end of the LNG booster pump 2 is located inside the LNG storage tank 1, and the driving end of the LNG booster pump 2 is located outside the LNG storage tank 1. The oil inlet and outlet of the driving end of the LNG booster pump 2 are connected to an oil tank 5 via pipelines, a reversing valve 3, and a bypass valve 4. An oil pump 6 is installed on the pipeline near the oil tank 5, and a temperature sensor TT1 is installed inside the oil tank 5. The exhaust port of the LNG booster pump 2 is connected to a vaporizer 9 via pipelines, a check valve 7, and a switching valve 8. The vaporizer 9 is then connected to a buffer tank 11 via pipelines and a safety shut-off valve 10. A temperature sensor TT2 is installed on the safety shut-off valve 10, and a temperature sensor TT3 and a pressure sensor PT are installed on the buffer tank 11. A flow meter FIQ is installed on the pipeline on the front side of the buffer tank 11.

[0016] The LNG storage tank 1 is equipped with a level gauge 12, which is used to detect the liquid level in the LNG storage tank 1. When the liquid level is lower than 20%, the level gauge 12 can issue an alarm signal to remind the staff to add liquid hydrogen in time.

[0017] A fan 13 is provided on one side of the oil tank 5 to cool the oil tank 5. When the temperature sensor TT1 is ≥60℃, the LNG booster pump 2 stops working and the fan 13 works at the same time. When the temperature detected by the temperature sensor TT1 is >40℃ and <60℃, the LNG booster pump 2 continues to work and the fan 13 works at the same time. When the temperature detected by the temperature sensor TT1 is ≤40℃, the LNG booster pump 2 continues to work and the fan 13 stops working.

[0018] The vaporizer 9 is connected to the water pump 14 and the electric water heater 15 via pipelines. The water pump 14 supplies hot water from the electric water heater 15 to the vaporizer 9 for vaporizing liquid hydrogen. When temperature sensors TT2 and TT3 are ≤ -30℃, it indicates that the vaporizer 9 is not sufficiently vaporizing the liquid hydrogen. The safety shut-off valve 10 closes, and the LNG booster pump 2 stops working. The safety shut-off valve 10 reopens only after temperature sensors TT2 and TT3 are > -30℃, and the LNG booster pump 2 starts working again.

[0019] Working principle:

[0020] At work,

[0021] After the system is powered on, when the temperature sensors TT1 < 60℃, TT2 > -30℃, and TT3 > -30℃, and the liquid level in the LNG storage tank is ≥ 20% simultaneously, the oil pump starts normally, supplying hydraulic oil from the tank to the LNG booster pump. The LNG booster pump starts normally. When the pressure sensor PT ≤ 28.5 MPa, the bypass valve closes, and the hydraulic oil drives the LNG booster pump. The reversing valve reverses the hydraulic oil flow, causing the drive end of the LNG booster pump to reciprocate, which in turn boosts the liquid hydrogen. The liquid hydrogen enters the vaporizer through pipelines, check valves, and switching valves. The vaporizer vaporizes the liquid hydrogen, and the vaporized gas enters the buffer tank through pipelines and safety shut-off valves. The pressure sensor PT in the buffer tank rises. When the pressure sensor PT ≥ 32.5 MPa, the reversing valve closes, the bypass valve opens, the hydraulic oil flows back to the tank, and the LNG booster pump stops working. The flow meter FIQ can detect the discharge volume of the LNG booster pump per unit time. If the discharge volume per unit time meets the required value, it proves that the LNG booster pump has stable performance and meets the factory requirements. If the discharge volume per unit time is lower than the required value, it proves that the LNG booster pump has a defect and needs to be repaired in time until it meets the required value before leaving the factory. This utility model system simulates the actual working environment of the LNG booster pump, and can perform performance testing on the LNG booster pump before leaving the factory, ensuring the later quality stability of the LNG booster pump and reducing the workload of later maintenance.

[0022] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.

[0023] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. An LNG booster pump control and testing system, characterized in that: The system includes an LNG storage tank and an LNG booster pump. The booster end of the LNG booster pump is located inside the LNG storage tank, while the drive end is located outside the LNG storage tank. The inlet and outlet of the drive end of the LNG booster pump are connected to the oil tank via pipelines, a reversing valve, and a bypass valve. An oil pump is installed on the pipeline near the oil tank, and a temperature sensor TT1 is installed inside the oil tank. The exhaust port of the LNG booster pump is connected to the vaporizer via pipelines, a check valve, and a switching valve. The vaporizer is then connected to the buffer tank via pipelines and a safety shut-off valve. A temperature sensor TT2 is installed on the safety shut-off valve, and a temperature sensor TT3 and a pressure sensor PT are installed on the buffer tank. A flow meter FIQ is installed on the pipeline in front of the buffer tank.

2. The LNG booster pump control and testing system according to claim 1, characterized in that: The LNG storage tank is equipped with a level gauge.

3. The LNG booster pump control and testing system according to claim 1, characterized in that: A fan is installed on one side of the fuel tank.

4. The LNG booster pump control and testing system according to claim 1, characterized in that: The vaporizer is connected to a water pump and an electric water heater via pipelines.

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