A self-pressurized and adjustable gas supply system

Abstract

The present invention discloses a self-pressurizing, adjustable gas supply system. The self-pressurizing, adjustable gas supply system includes a storage tank and a vaporizer. The LNG inlet on the lower side of the vaporizer is connected to the bottom of the storage tank via a third pipeline. The gas outlet on the lower side of the vaporizer is connected to a fourth pipeline that supplies gas to the gas engine. The water inlet of the vaporizer is connected to a river water cooling system via a fifth pipeline. The third pipeline is provided with a liquid-phase gas supply regulating valve, the fourth pipeline is provided with a pressure monitoring sensor and a temperature monitoring sensor, and the fifth pipeline is provided with a temperature regulating valve. The pressure monitoring sensor and the liquid-phase gas supply regulating valve are connected to a liquid-phase PID controller, and the temperature monitoring sensor and the temperature regulating valve are connected to a temperature PID controller. The present invention solves the problem in the prior art whereby the gas engine shuts down due to excessive temperature and pressure, resulting in failures caused by the inability to regulate gas pressure and temperature, posing a significant safety hazard to navigation.

Description

Technical Field

[0001] The present invention relates to the field of shipbuilding, and in particular to a self-pressurizing and adjustable gas supply system. Background Art

[0002] Existing inland vessels often use self-pressurized gas supply systems to simultaneously supply gas to multiple gas engines. The gas vaporizers in these systems are designed for full load, using river water as the vaporization medium. However, as the ambient temperature and river water temperature fluctuate, as well as changes in the main engine load (acceleration, deceleration, etc.), individual gas engines often experience uncontrolled pressure and temperature, leading to excessive system pressure and temperature, causing gas engine shutdowns and serious safety hazards during navigation. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies in the prior art and to provide a self-pressurizing adjustable gas supply system that avoids gas engine shutdown failures by controlling gas pressure and temperature, thereby eliminating potential navigation safety hazards.

[0004] To achieve the above objectives, the technical solution adopted by the self-pressurized adjustable gas supply system of the present invention is:

[0005] A self-pressurizing adjustable gas supply system includes a storage tank and a vaporizer, wherein the LNG inlet on the upper side of the vaporizer is connected to the bottom of the storage tank through a first pipe, the gas outlet on the upper side of the vaporizer is connected to the top of the storage tank through a second pipe, the LNG inlet on the lower side of the vaporizer is connected to the bottom of the storage tank through a third pipe, the gas outlet on the lower side of the vaporizer is connected to a fourth pipe for supplying gas to the gas engine, the water inlet of the vaporizer is connected to a river water cooling system through a fifth pipe, a liquid-phase gas supply regulating valve is provided on the third pipe, a pressure monitoring sensor and a temperature monitoring sensor are provided on the fourth pipe, and a temperature regulating valve is provided on the fifth pipe. The pressure monitoring sensor and the liquid-phase gas supply regulating valve are connected to a liquid-phase PID controller, and the temperature monitoring sensor and the temperature regulating valve are connected to a temperature PID controller.

[0006] Preferably, the third pipeline is provided with a sixth pipeline connected to the top of the storage tank, the connection point of the sixth pipeline and the third pipeline is between the liquid phase gas supply regulating valve and the vaporizer, and the sixth pipeline is provided with a gas phase gas supply regulating valve, and the gas phase gas supply regulating valve and the pressure monitoring sensor are connected to a gas phase PID controller.

[0007] Preferably, a pressure alarm sensor and a temperature alarm sensor are provided on the fourth pipeline.

[0008] Preferably, a buffer tank for pressure stabilization is provided on the fourth pipeline, the pressure alarm sensor, temperature alarm sensor and temperature monitoring sensor are located on one side of the buffer tank air inlet, and the pressure monitoring sensor is located on one side of the buffer tank air outlet.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] The liquid-phase PID controller compares the pressure monitoring sensor's feedback signal with the preset target pressure and then outputs an actuating signal to the actuator of the liquid-phase gas supply control valve to adjust the valve's opening, controlling the flow of LNG into the vaporizer and thus maintaining the gas pressure at the target. The gas-phase PID controller compares the pressure monitoring sensor's feedback signal with the preset target pressure and then outputs an actuating signal to the actuator of the gas-phase gas supply control valve to adjust the valve's opening, controlling the flow of BOG into the vaporizer and thus maintaining the gas pressure at the target. The temperature PID controller compares the temperature monitoring sensor's feedback signal with the preset target temperature and then outputs an actuating signal to the actuator of the temperature control valve to adjust the valve's opening, controlling the flow of heat medium (river water after cooling the generator) into the vaporizer and thus maintaining the gas temperature at the target. This method controls the gas pressure and temperature in the system, preventing gas engine shutdowns and eliminating safety hazards during navigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of a self-pressurized and adjustable gas supply system.

[0012] Figure 2 It is a working diagram of liquid-phase gas supply;

[0013] Figure 3 It is a working diagram of gas phase gas supply.

[0014] Among them, 1 storage tank, 2 vaporizer, 3 first pipeline, 4 second pipeline, 5 third pipeline, 6 liquid phase gas supply regulating valve, 7 sixth pipeline, 8 gas phase gas supply regulating valve, 9 gas engine, 10 fourth pipeline, 11 pressure monitoring sensor, 12 temperature monitoring sensor, 13 pressure alarm sensor, 14 temperature alarm sensor, 15 buffer tank, 16 fifth pipeline, 17 temperature regulating valve, 18 temperature PID controller, 19 liquid phase PID controller, 20 gas phase PID controller. DETAILED DESCRIPTION

[0015] The present invention is further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0016] like Figure 1-3 As shown, a self-pressurizing adjustable gas supply system includes a storage tank 1 and a vaporizer 2. The LNG inlet on the upper side of the vaporizer is connected to the bottom of the storage tank through a first pipe 3, and the gas outlet on the upper side of the vaporizer is connected to the top of the storage tank through a second pipe 4, thereby forming a self-pressurizing circuit. The LNG inlet on the lower side of the vaporizer is connected to the bottom of the storage tank through a third pipe 5. A liquid-phase gas supply regulating valve 6 is installed on the third pipe. The third pipe is connected to a sixth pipe 7. The connection point between the sixth pipe and the third pipe is between the liquid-phase gas supply regulating valve and the vaporizer. The sixth pipe is connected to the top of the storage tank. A gas-phase gas supply regulating valve 8 is installed on the sixth pipe. The gas outlet on the lower side of the vaporizer is connected to a fourth pipe 10 that supplies gas to a gas engine 9. A pressure monitoring sensor 11 and a temperature monitoring sensor 12 are installed on the fourth pipe. A pressure alarm sensor 13, a temperature alarm sensor 14 and a buffer tank 15 for pressure stabilization. The pressure alarm sensor, temperature alarm sensor and temperature monitoring sensor are located on one side of the buffer tank air inlet, and the pressure monitoring sensor is located on one side of the buffer tank air outlet. The water inlet of the vaporizer is connected to the river water cooling system through the fifth pipe 16. The river water used to cool the gas engine becomes the heat medium of the vaporizer. A temperature regulating valve 17 is installed on the fifth pipe. The temperature regulating valve and the temperature monitoring sensor are connected to the temperature PID controller 18. The pressure monitoring sensor and the liquid-phase gas supply regulating valve are connected to the liquid-phase PID controller 19. The gas-phase gas supply regulating valve and the pressure monitoring sensor are connected to the gas-phase PID controller 20. The models of the temperature PID controller, the liquid-phase PID controller and the gas-phase PID controller are OMRON E5DC digital regulators.

[0017] The method for automatically regulating the pressure of liquid gas comprises the following steps:

[0018] S1, setting of valve action of liquid-phase gas supply regulating valve: when FGSS inputs 4-20mA to the valve actuator of liquid-phase gas supply regulating valve, 4mA corresponds to the maximum valve opening, 12mA corresponds to 50% valve opening, and 20mA corresponds to the minimum valve opening;

[0019] S2, setting of target pressure SPv of liquid phase PID controller:

[0020] a. Set a minimum value Mv for the liquid phase PID controller. Mv corresponds to the valve opening of the liquid phase gas supply regulating valve, and the gas pressure is the minimum pressure required to maintain the operation of the gas engine;

[0021] b. Observe the value of the liquid phase PID controller. The larger the output value (the smaller the valve opening), the smaller the feedback signal value of the pressure monitoring sensor should be; the smaller the output value (the smaller the valve opening), the larger the feedback signal value of the pressure monitoring sensor should be.

[0022] c. After the output value of the liquid phase PID controller satisfies the variation rule in step b, the target pressure SPv of the liquid phase PID controller is set according to the optimal gas pressure value required by the gas engine;

[0023] d. Observe the value of the pressure monitoring sensor, set the liquid phase PID controller for self-tuning, and save the data after the tuning is completed;

[0024] In step S3, the pressure monitoring sensor transmits a feedback signal FPv to the liquid-phase PID controller. The liquid-phase PID controller compares FPv and SPv and calculates the output Mv. The actuator of the liquid-phase gas supply regulating valve adjusts the valve opening according to Mv to adjust the gas pressure to the optimal gas pressure value required by the gas engine.

[0025] The method for automatically adjusting the gas phase gas pressure and the method for automatically adjusting the gas temperature are similar to the method for automatically adjusting the liquid phase gas pressure and will not be described in detail.

Claims

1. A method for automatically regulating the liquid-phase gas pressure of a gas supply system, characterized by: The steps include: S1, setting of valve action of liquid-phase gas supply regulating valve: the gas supply system includes a storage tank and a vaporizer. The LNG inlet on the upper side of the vaporizer is connected to the bottom of the storage tank through a first pipe, the gas outlet on the upper side of the vaporizer is connected to the top of the storage tank through a second pipe, the LNG inlet on the lower side of the vaporizer is connected to the bottom of the storage tank through a third pipe, the gas outlet on the lower side of the vaporizer is connected to a fourth pipe for supplying gas to the gas turbine, and the water inlet of the vaporizer is connected to the river water cooling system through a fifth pipe. A liquid-phase gas supply regulating valve is provided on the third pipe, a pressure monitoring sensor and a temperature monitoring sensor are provided on the fourth pipe, and a temperature regulating valve is provided on the fifth pipe. The pressure monitoring sensor and the liquid-phase gas supply regulating valve are connected to a liquid-phase PID controller, and the temperature monitoring sensor and the temperature regulating valve are connected to a temperature PID controller. When the FGSS inputs 4-20mA to the valve actuator of the liquid-phase gas supply regulating valve, 4mA corresponds to the maximum valve opening, 12mA corresponds to 50% valve opening, and 20mA corresponds to the minimum valve opening; S2, setting of target pressure SPv of liquid phase PID controller: a. Set a minimum value Mv for the liquid phase PID controller. When the valve opening of the liquid phase gas supply regulating valve corresponding to Mv is such that the gas pressure is the minimum pressure required for the gas engine to maintain operation; b. Observe the values of the liquid phase PID controller. The larger the output value, the smaller the valve opening, and the smaller the feedback signal value of the pressure monitoring sensor should be; the smaller the output value, the smaller the valve opening, and the larger the feedback signal value of the pressure monitoring sensor should be; c. After the output value of the liquid phase PID controller satisfies the variation rule in step b, the target pressure SPv of the liquid phase PID controller is set according to the optimal gas pressure value required by the gas engine; d. Observe the value of the pressure monitoring sensor, set the liquid phase PID controller for self-tuning, and save the data after the tuning is completed; In step S3, the pressure monitoring sensor transmits a feedback signal FPv to the liquid-phase PID controller. The liquid-phase PID controller compares FPv and SPv and calculates the output Mv. The actuator of the liquid-phase gas supply regulating valve adjusts the valve opening according to Mv to adjust the gas pressure to the optimal gas pressure value required by the gas engine.

2. The method for automatically regulating the liquid-phase gas pressure according to claim 1, characterized in that: The third pipeline is provided with a sixth pipeline connected to the top of the storage tank. The connection point of the sixth pipeline and the third pipeline is between the liquid phase gas supply regulating valve and the vaporizer. The sixth pipeline is provided with a gas phase gas supply regulating valve. The gas phase gas supply regulating valve and the pressure monitoring sensor are connected to a gas phase PID controller.

3. The method for automatically regulating the liquid-phase fuel gas pressure according to claim 1, characterized in that: The fourth pipeline is provided with a pressure alarm sensor and a temperature alarm sensor.

4. The method for automatically regulating the liquid-phase gas pressure according to claim 3, characterized in that: A buffer tank for pressure stabilization is provided on the fourth pipeline. The pressure alarm sensor, temperature alarm sensor and temperature monitoring sensor are located on one side of the buffer tank air inlet, and the pressure monitoring sensor is located on one side of the buffer tank air outlet.

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