LNG storage tank pressurization system capable of reducing power consumption of booster pump
By adopting a two-way parallel buffer tank design in the LNG storage tank boosting system, the problem of a single buffer tank being susceptible to the influence of engine gas has increased power consumption, and the power consumption of the booster pump and the stable operation of the system are achieved.
Patent Information
- Application Number
- CN202421484698.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-06-26
AI Technical Summary
In the existing LNG storage tank boosting system, a single buffer tank is easily affected by the instability of the engine gas, resulting in a reduction in the gas volume of the booster circuit and an increase in the power consumption of the booster pump.
The buffer tank design is adopted in parallel with two channels. The first buffer tank is equipped with a booster pump on the back side and the second buffer tank is connected to the engine on the back side. The independent buffer tank design ensures that the gas volume of the booster circuit is not affected by the engine gas.
Through the independent buffer tank design, the booster pump can maintain constant power operation, reduce the power consumption of the booster pump, and increase the gas temperature through the heat exchange area of the first buffer tank to protect the booster pump.
Smart Images
Figure CN222634320U_ABST
Abstract
Description
Technical field:
[0001] The utility model relates to the technical field of LNG storage tank pressurization, in particular to an LNG storage tank pressurization system which reduces the power consumption of a boosting pump. Background technology:
[0002] At present, when LNG storage tanks are in use, as the liquid in the tank is used, the liquid level in the tank continues to drop, the gas phase space increases, and the pressure in the LNG storage tank continues to decrease, and the liquid outflow rate decreases until it stops. Therefore, in normal operation, gas must be continuously added to the tank to maintain the pressure in the tank within a certain range. This process is called pressurization. Now it is generally necessary to increase the gas pressure through a booster pump, but because the LNG gas temperature is as low as about -130℃, it is necessary to arrange a buffer tank in front of the booster pump to increase the gas temperature and meet the inlet temperature requirements of the booster pump. The current solution on the market is a single buffer tank, which is divided into two paths after the buffer tank: one is the boosting circuit, and the pressurized gas returns to the LNG storage tank; the second is the gas directly entering the engine for combustion. With this design, since the engine's gas consumption is unstable, sometimes large and sometimes small, when the gas consumption is large, it is easy to interfere with the boosting circuit after the buffer tank, causing the gas volume in the boosting circuit to decrease, resulting in insufficient boosting in the LNG storage tank, which in turn puts higher performance requirements on the boosting pump. The boosting pump needs to work at high horsepower to replenish gas to the LNG storage tank, increasing the power consumption of the boosting pump.
[0003] In summary, the power consumption problem of the boosting pump in the LNG tank boosting system has become a technical problem that needs to be solved urgently in the industry. Utility model content:
[0004] The utility model provides an LNG storage tank boosting system for reducing the power consumption of the boosting pump in order to make up for the deficiencies of the prior art, thereby solving the problems that the single buffer tank used in the previous LNG storage tank boosting system is easily affected by the gas consumption of the engine, the gas volume of the boosting circuit is reduced, and the power consumption of the boosting pump is increased.
[0005] The technical solution adopted by the utility model to solve the above technical problems is:
[0006] An LNG storage tank pressurizing system for reducing the power consumption of a boosting pump comprises an LNG storage tank, a liquid outlet is provided at the bottom of the LNG storage tank, the liquid outlet is connected to one end of a liquid pipeline, a first stop valve and a pressure regulating valve are provided on the liquid pipeline, the other end of the liquid pipeline is connected to a liquid inlet of a vaporizer assembly, a gas outlet of the vaporizer assembly is connected to a gas pipeline, the gas pipeline is respectively connected to a first buffer tank and a second buffer tank, the first buffer tank and the second buffer tank are arranged in parallel, a boosting pump is provided on the gas pipeline on the rear side of the first buffer tank, and the gas pipeline on the rear side of the boosting pump is connected to the gas inlet on the top of the LNG storage tank via a second stop valve; the gas pipeline on the rear side of the second buffer tank is connected to an engine.
[0007] The first buffer tank and the second buffer tank are arranged as a whole or separately.
[0008] The gasifier assembly includes a water bath gasifier.
[0009] The gasifier assembly also includes a plurality of air-temperature gasifiers.
[0010] A temperature sensor is arranged on the gas pipeline at the front side of the booster pump.
[0011] A pressure sensor is arranged on the gas pipeline at the rear side of the booster pump.
[0012] A check valve is provided on the gas pipeline near the LNG storage tank.
[0013] The utility model adopts the above scheme and has the following advantages:
[0014] By connecting the first buffer tank and the second buffer tank on the gas pipeline, the first buffer tank and the second buffer tank are arranged in parallel, a booster pump is arranged on the gas pipeline on the rear side of the first buffer tank, and the gas pipeline on the rear side of the second buffer tank is connected to the engine. The first buffer tank and the second buffer tank work independently, and the gas volume of the booster circuit will not be affected by the instability of the engine gas consumption. The booster pump can maintain constant power operation, thereby reducing the power consumption of the booster pump, and the wiring harness current is low, ensuring vehicle safety. At the same time, the heat exchange area of the first buffer tank can be used to increase the gas temperature to meet the intake temperature requirement of the booster pump, avoid low-temperature liquid or gas from entering the booster pump, causing abnormal damage to the booster pump, and protect the booster pump. Description of the drawings:
[0015] Figure 1 It is a schematic diagram of the structural principle of the utility model.
[0016] In the figure, 1. LNG storage tank, 2. liquid pipeline, 3. first stop valve, 4. pressure regulating valve, 5. gas pipeline, 6. first buffer tank, 7. second buffer tank, 8. booster pump, 9. second stop valve, 10. engine, 11. water bath vaporizer, 12. air temperature vaporizer, 13. temperature sensor, 14. pressure sensor, 15. check valve. Specific implementation method:
[0017] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.
[0018] like Figure 1As shown, an LNG tank boosting system for reducing the power consumption of a boosting pump includes an LNG tank 1, a liquid outlet is provided at the bottom of the LNG tank 1, the liquid outlet is connected to one end of a liquid pipeline 2, a first stop valve 3 and a pressure regulating valve 4 are provided on the liquid pipeline 2, the other end of the liquid pipeline 2 is connected to the liquid inlet of a vaporizer assembly, the gas outlet of the vaporizer assembly is connected to a gas pipeline 5, the gas pipeline 5 is respectively connected to a first buffer tank 6 and a second buffer tank 7, the first buffer tank 6 and the second buffer tank 7 are arranged in parallel, a boosting pump 8 is provided on the gas pipeline 5 on the rear side of the first buffer tank 6, and the gas pipeline 5 on the rear side of the boosting pump 8 is connected to the gas inlet at the top of the LNG tank 1 through a second stop valve 9; the gas pipeline on the rear side of the second buffer tank 7 is connected to an engine 10.
[0019] The first buffer tank 6 and the second buffer tank 7 are arranged as a whole or separately.
[0020] The vaporizer assembly includes a water bath vaporizer 11. The water bath vaporizer 11 is a device that vaporizes low temperature liquid gas into gaseous gas by heat exchange between hot water and low temperature liquid gas, including an electric heating water bath vaporizer, a steam water bath vaporizer or a circulating hot water water bath vaporizer.
[0021] The gasifier assembly further includes a plurality of air-temperature gasifiers 12. The plurality of air-temperature gasifiers 12 are used in conjunction with the water-bath gasifier 11 to increase the contact area with the outside air and improve the gasification effect.
[0022] A temperature sensor 13 is provided on the gas pipeline 5 at the front side of the booster pump 8 .
[0023] A pressure sensor 14 is provided on the gas pipeline 5 at the rear side of the booster pump 8 .
[0024] The gas pipeline 5 is provided with a check valve 15 near the LNG storage tank 1. The check valve 15 can prevent the liquid in the LNG storage tank 1 from flowing back into the booster pump 8, thereby protecting the booster pump 8.
[0025] Working principle:
[0026] When the pressure in the LNG storage tank 1 is lower than the set value of the pressure regulating valve 4, the pressure regulating valve 4 opens, and the liquid in the LNG storage tank 1 slowly flows into the gasifier assembly through the first stop valve 3, the pressure regulating valve 4, and the liquid pipeline 2 by the liquid level difference, and the gas generated by the liquid gasification enters the gas pipeline 5. A branch of the gas in the gas pipeline 5 flows through the first buffer tank 6, the booster pump 8, the second stop valve 9, and the check valve 15 to be replenished in the LNG storage tank 1. The continuous replenishment of gas causes the pressure in the LNG storage tank 1 to rise. When the gas pressure in the LNG storage tank 1 rises above the set value of the pressure regulating valve 4, the pressure regulating valve 4 closes, and the booster pump 8 is controlled to stop working; another branch of the gas in the gas pipeline 5 flows through the second buffer tank 7 and enters the engine 10 for combustion. The first buffer tank 6 and the second buffer tank 7 work independently. When the gas consumption of the engine 10 increases, the gas volume of the boosting circuit will not be affected in any way, so that the booster pump 8 can maintain constant power operation, thereby reducing the power consumption of the booster pump 8. The gas temperature of the first buffer tank 6 is at least the ambient temperature. The heat exchange area of the first buffer tank 6 can be used to increase the gas temperature. Therefore, no extremely low temperature gas or liquid will pass through the booster pump 8, thereby meeting the intake temperature requirement of the booster pump 8.
[0027] The above-mentioned specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.
[0028] The matters not described in detail in the present invention are all known technologies to those skilled in the art.
Claims
1. An LNG tank boosting system for reducing the power consumption of a boosting pump, characterized in that: It includes an LNG storage tank, a liquid outlet is provided at the bottom of the LNG storage tank, the liquid outlet is connected to one end of a liquid pipeline, a first stop valve and a pressure regulating valve are provided on the liquid pipeline, the other end of the liquid pipeline is connected to the liquid inlet of the vaporizer assembly, the gas outlet of the vaporizer assembly is connected to the gas pipeline, the gas pipeline is respectively connected to the first buffer tank and the second buffer tank, the first buffer tank and the second buffer tank are arranged in parallel, a booster pump is provided on the gas pipeline on the rear side of the first buffer tank, and the gas pipeline on the rear side of the booster pump is connected to the gas inlet on the top of the LNG storage tank through the second stop valve; the gas pipeline on the rear side of the second buffer tank is connected to the engine.
2. The LNG tank boosting system for reducing boosting pump power consumption according to claim 1, characterized in that: The first buffer tank and the second buffer tank are arranged as a whole or separately.
3. The LNG tank boosting system for reducing boosting pump power consumption according to claim 1, characterized in that: The gasifier assembly includes a water bath gasifier.
4. The LNG tank boosting system for reducing boosting pump power consumption according to claim 3 is characterized in that: The gasifier assembly also includes a plurality of air-temperature gasifiers.
5. The LNG tank boosting system for reducing boosting pump power consumption according to claim 1, characterized in that: A temperature sensor is arranged on the gas pipeline at the front side of the booster pump.
6. The LNG tank boosting system for reducing boosting pump power consumption according to claim 1, characterized in that: A pressure sensor is arranged on the gas pipeline at the rear side of the booster pump.
7. The LNG tank boosting system for reducing boosting pump power consumption according to claim 1, characterized in that: A check valve is provided on the gas pipeline near the LNG storage tank.