A gas safety valve leakage detection device and method suitable for LNG fuelled ships

Abstract

The application discloses a kind of gas safety valve leakage detection device and method suitable for LNG fuel ship, it is related to ship fuel transport equipment field, including gas passage automatic switching device and safety liquid reaction device, gas passage automatic switching device includes flow guide sealing shell, flow guide sealing shell outside is equipped with safety valve gas adapter, inside rotationally connected with gas flow guide fan, gas flow guide fan is equipped with leakage gas passage, leakage gas passage one end is communicated with safety valve gas adapter, another end is communicated with safety liquid reaction device;Gas flow guide fan is also equipped with high-pressure gas passage, high-pressure gas in gas safety valve pushes gas flow guide fan to rotate to high-pressure gas passage one end and safety valve gas adapter is communicated, high-pressure gas passage other end is communicated to high-pressure gas release pipeline at this time.It can quickly and accurately determine whether gas safety valve leaks, reaches the effect of improving LNG fuel ship gas valve group use safety.

Description

Technical Field

[0001] This invention relates to the field of marine fuel transportation equipment, and in particular to a gas safety valve leakage detection device and method suitable for LNG fuel ships. Background Technology

[0002] With the vigorous promotion of low-carbon economy, development of green shipping, and construction of low-carbon ships both domestically and internationally, LNG has gradually become a major clean energy source for ships due to its advantages such as clean emissions, convenient storage and transportation, and high utilization efficiency. However, due to its special hazards such as low temperature, flammability, and explosiveness, leaks pose a significant risk to the safety of ship personnel and equipment. Gas valve assemblies are one of the main leakage points during LNG refueling and use. Simple and effective valve assembly gas leak detection technology can provide technical assurance for the safe navigation of LNG-fueled ships.

[0003] Currently, leak detection in the ambient temperature system safety valves of LNG-fueled ships mainly relies on installing sensors or gas sampling. Installing gas sensors at the gas vent pipe of the safety valve is simple to operate and technically mature, but it is costly and has low accuracy in low-concentration leaks. Installing a gas sampling valve at the safety valve outlet provides high accuracy, but personnel need to carry specialized testing equipment, making the operation complex and posing a risk of gas leakage. Summary of the Invention

[0004] The purpose of this invention is to provide a gas safety valve leakage detection device suitable for LNG-fueled ships. It is easy to operate, compact in size, and has low operating costs. It can quickly and accurately determine whether the gas safety valve is leaking, thereby improving the safety of the gas valve assembly in LNG-fueled ships.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A gas safety valve leakage detection device suitable for LNG fueled ships includes an automatic gas passage switching device and a safety liquid reaction device. The automatic gas passage switching device includes a flow guiding sealing shell, a safety valve gas adapter on the outside of the flow guiding sealing shell, and a gas flow guiding fan rotatably connected to the inside. The gas flow guiding fan has a leakage gas passage. One end of the leakage gas passage is connected to the safety valve gas adapter, and the other end is connected to the safety liquid reaction device. The safety liquid reaction device detects whether there is a gas leak. The gas guide fan is also equipped with a high-pressure gas passage. The high-pressure gas in the gas safety valve drives the gas guide fan to rotate until one end of the high-pressure gas passage is connected to the gas adapter of the safety valve. At this time, the other end of the high-pressure gas passage is connected to the high-pressure gas venting pipe.

[0007] Furthermore, the automatic gas passage switching device is also equipped with a reset component, which drives the gas guide fan to rotate under normal conditions until the leaking gas passage is connected to the gas adapter of the safety valve.

[0008] Furthermore, the reset component includes a reset torsion spring, one end of which is connected to the flow-guiding sealing housing, and the other end is connected to the gas flow guide fan.

[0009] Furthermore, the automatic gas passage switching device is also equipped with a limiting component, which restricts the rotation angle of the gas guide fan within the guide sealing housing.

[0010] Furthermore, the limiting component includes a limiting slider connected to the outside of the gas guide fan. A limiting groove is formed in the guide sealing shell. The rotation of the gas guide fan drives the limiting slider to slide in the limiting groove. The position where the limiting slider abuts against one end of the limiting groove corresponds to the position where the gas guide fan rotates to the position where the leakage gas passage is connected to the safety valve gas adapter. The position where the limiting slider abuts against the other end of the limiting groove corresponds to the position where the gas guide fan rotates to the position where the high-pressure gas passage is connected to the safety valve gas adapter.

[0011] Furthermore, the safety liquid reaction device includes a reaction chamber and a vent tube. One end of the vent tube is connected to a leaking gas pipeline, and the other end extends into the reaction chamber. The end of the leaking gas pipeline away from the vent tube is connected to a leaking gas passage. The reaction chamber contains safety liquid, and some or all of the vents of the vent tube are located in the safety liquid.

[0012] Furthermore, the reaction chamber is also equipped with a detection system to detect whether air bubbles are generated in the safety liquid.

[0013] Furthermore, the detection system includes an ultrasonic transmitting module and an ultrasonic receiving module. The ultrasonic transmitting module emits ultrasonic waves, and the ultrasonic receiving module receives the signals. A signal processing unit compares the theoretical and actual propagation times of the ultrasonic waves in the safety liquid to detect the presence or absence of bubbles and sends a gas leak alarm signal. This application also discloses a detection method for a gas safety valve leakage detection device applicable to LNG-fueled ships, comprising the following steps: When a gas safety valve leaks, the leaking gas enters the automatic gas switching device through the safety valve gas adapter, and then enters the safety liquid reaction device through the leaking gas passage to detect whether there is a gas leak. When high-pressure gas appears in the gas safety valve, the high-pressure gas enters the gas automatic switching device through the safety valve gas adapter, drives the gas guide fan to rotate, opens the high-pressure gas passage, and the high-pressure gas enters the high-pressure gas venting pipe from the high-pressure gas passage to complete the high-pressure venting work of the safety valve.

[0014] Furthermore, after the high-pressure gas is released, the gas guide fan rotates to reset, allowing the leaked gas passage to be normally connected to the safety valve gas adapter and the safety liquid reaction device.

[0015] In summary, the present invention has the following beneficial effects: When the gas safety valve leaks, the leaked gas enters the gas reaction chamber through the vent pipe. The ultrasonic detection system monitors the bubbles generated by the safety fluid to determine whether there is a risk of leakage in the safety valve and triggers an alarm. When the gas pressure exceeds the safety valve's set safety pressure, the high-pressure gas automatically switches to the gas path for normal release. This effectively monitors gas leaks without affecting the normal use of the safety valve, thus improving the safety of LNG-fueled ship gas valve assemblies. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a gas safety valve leakage detection device suitable for LNG-fueled ships according to this embodiment; Figure 2 This is a schematic diagram of the automatic gas path switching device in a gas safety valve leakage detection device for LNG-fueled ships according to this embodiment. Figure 3 This is a schematic diagram showing the disassembled gas passage automatic switching device in a gas safety valve leakage detection device for LNG-fueled ships according to this embodiment. Figure 4 This is an explosion diagram of the safety fluid reaction device in a gas safety valve leakage detection device suitable for LNG-fueled ships according to this embodiment; Figure 5 This is a schematic diagram of the internal structure of the safety fluid reaction device in a gas safety valve leakage detection device suitable for LNG-fueled ships according to this embodiment; Figure 6 This is a schematic diagram of the ultrasonic bubble detection system in a gas safety valve leakage detection device suitable for LNG-fueled ships, as described in this embodiment. Explanation of reference numerals in the attached diagram: 101, Gas guide fan; 102, Leaking gas passage; 103, Return torsion spring; 104, High-pressure gas outlet; 105, Limiting slide groove; 106, Leaking gas outlet; 107, Safety valve gas inlet; 108, High-pressure gas passage; 109, Limiting slider; 110, Guide sealing shell; 201, Reaction chamber; 202, High-pressure gas venting pipe; 203, Gas vent pipe; 204, Sealing cap; 205, Leaking gas pipe; 301, Wireless signal transmitter; 302, Detector head guide; 303, Ultrasonic transducer one; 304, Temperature sensor; 305, Ultrasonic transducer two; 401, High-pressure gas adapter; 402, Safety valve gas adapter; 403, Leaking gas adapter; 404, Safety valve connecting flange; 5, Power module. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0018] A gas safety valve leak detection device suitable for LNG-fueled ships, such as Figure 1 As shown, it includes an automatic gas path switching device and a safety liquid reaction device. When the gas safety valve leaks, the leaked gas enters the safety liquid reaction device, which alarms the leaking gas. When the gas pressure exceeds the safety valve's set safety pressure, the automatic gas path switching device switches the path to achieve normal release and effectively monitor gas leaks.

[0019] like Figure 2 and Figure 3 As shown, the automatic gas passage switching device includes a flow guiding sealing housing 110. A safety valve connecting flange 404 is connected to the outside of the flow guiding sealing housing 110. The outer end of the safety valve connecting flange 404 is connected to a gas safety valve to receive gas leaked from the safety valve. An axial safety valve gas adapter 402 is fixed on the outer periphery of the flow guiding sealing housing 110. A radial through hole is opened on the inner periphery of the safety valve connecting flange 404, and the outer end of the through hole is connected to the safety valve gas adapter 402. A gas guide fan 101 is coaxially rotatably connected to the inner side of the flow guide sealing housing 110. A leakage gas passage 102 is opened on the side of the gas guide fan 101 away from the safety valve connecting flange 404. One end of the leakage gas passage 102 is connected to the safety valve gas adapter 402, and the other end is connected to the safety liquid reaction device. The leaked gas enters the safety liquid reaction device through the leakage gas passage 102. The safety liquid reaction device detects whether there is a gas leak. In this embodiment, a safety valve gas inlet 107 and a leak gas outlet 106 are provided on the outer periphery of the flow-guiding sealing housing 110. Under normal conditions, the safety valve gas inlet 107 and the leak gas outlet 106 are interconnected through a leak gas passage 102. The safety valve gas inlet 107 is connected to the end of the safety valve gas adapter 402 away from the safety valve connecting flange 404, so that the leaked gas enters the gas guide fan 101 from here. An axial leak gas adapter 403 is fixed on the outer periphery of the flow-guiding sealing housing 110. The leak gas outlet 106 is connected to the leak gas adapter 403, so that the leaked gas leaves the gas flow-guiding sealing housing 110 from here. The other end of the leak gas adapter 403 is connected to the safety liquid reaction device for detection.

[0020] like Figure 2 and Figure 3 As shown, a high-pressure gas passage 108 is also provided in the gas guide fan 101. The high-pressure gas in the gas safety valve drives the gas guide fan 101 to rotate until one end of the high-pressure gas passage 108 is connected to the safety valve gas adapter 402. At this time, the other end of the high-pressure gas passage 108 is connected to the high-pressure gas venting pipe 202 (a high-pressure gas outlet 104 is opened on the outer periphery of the guide sealing shell 110, an axial high-pressure gas adapter 401 is fixed on the outer periphery of the guide sealing shell 110, and the high-pressure gas venting pipe 202 is fixed on the outer periphery of the safety liquid reaction device. The two ends of the high-pressure gas adapter 401 are respectively connected to the high-pressure gas outlet 104 and the high-pressure gas venting pipe 202 to realize the venting of high-pressure gas). In this embodiment, the high-pressure gas passage 108 is curved and is located on one side of the gas guide fan 101. The leakage gas passage 102 is located on the other side of the gas guide fan 101. The leakage gas passage 102 also has a fan-shaped area near the gas inlet 107 of the safety valve. The gas inlet 107 of the safety valve enters the fan-shaped area and then enters the leakage gas passage 102, so that one side of the fan-shaped area is connected to the leakage gas passage 102. This allows the leakage gas to pass through the leakage gas passage 102 and the leakage gas outlet 106 to the safety liquid reaction device. The other side of the fan-shaped area is directly opposite the gas inlet 107 of the safety valve, so that when the high-pressure gas is introduced, it can push the gas guide fan 101 to rotate as a whole towards this side.

[0021] like Figure 3 As shown, the automatic gas passage switching device is also equipped with a reset component. The reset component drives the gas guide fan 101 to rotate under normal conditions until the leakage gas passage 102 is connected to the safety valve gas adapter 402. After the high-pressure gas is introduced, it overcomes the force of the reset component and drives the gas guide fan 101 to rotate until one end of the high-pressure gas passage 108 is connected to the safety valve gas adapter 402. The reset component realizes the reset of the gas guide fan 101 after the high-pressure gas is introduced. In this embodiment, the reset component includes a reset torsion spring 103. One end of the reset torsion spring 103 is connected to the flow-guiding sealing housing 110, and the other end is connected to the through hole in the middle of the gas flow guide fan 101. Other elastic elements can also be selected for the reset component.

[0022] like Figure 3 As shown, in order to limit the rotation angle of the gas guide fan 101 in the guide sealing housing 110, the gas passage automatic switching device is also provided with a limiting component; the limiting component includes a limiting slider 109 fixedly connected to the outer periphery of the gas guide fan 101, and a corresponding circumferential limiting groove 105 is opened on the inner periphery of the guide sealing housing 110. The rotation of the gas guide fan 101 drives the limiting slider 109 to slide in the limiting groove 105. The position of the limiting slider 109 abutting against one end of the limiting groove 105 corresponds to the position where the gas guide fan 101 rotates to the position where the leakage gas passage 102 is connected to the safety valve gas adapter 402, and the position of the limiting slider 109 abutting against the other end of the limiting groove 105 corresponds to the position where the gas guide fan 101 rotates to the position where the high pressure gas passage 108 is connected to the safety valve gas adapter 402.

[0023] like Figure 4 and Figure 5 As shown, the safety liquid reaction device includes a reaction chamber 201 and a vent pipe 203. An axial leakage gas pipe 205 is fixed on the outer periphery of the reaction chamber 201. One end of the vent pipe 203 is sealed and connected to the leakage gas pipe 205, and the other end extends into and is sealed and connected to the reaction chamber 201. The end of the leakage gas pipe 205 away from the vent pipe 203 is connected to a leakage gas adapter 403, so that it is connected to the leakage gas passage 102, thereby enabling the leakage gas to enter. The reaction chamber 201 includes a sealing cover 204 at the end away from the automatic gas passage switching device. The reaction chamber 201 and the sealing cover 204 are mechanically connected by threads or other means. The reaction chamber 201 is filled with safety fluid. The vent of the vent pipe 203 is located in the safety fluid. The presence of air bubbles is used to detect whether there is a leak. In this embodiment, the safety fluid is an ethylene glycol aqueous solution with an ethylene glycol content of 60%. The safety fluid is filled to 2 / 3 of the height of the reaction chamber 201. A vent hole can be left at the top of the reaction chamber 201.

[0024] The gas leakage adapter 403, high-pressure gas adapter 401, safety valve gas adapter 402, and safety valve connecting flange 404 constitute a gas passage connection. The gas leakage adapter 403 is sealed and connected to the gas leakage pipeline 205 of the reaction chamber 201 and the gas leakage outlet 106 of the flow guiding and sealing shell 110, respectively. The high-pressure gas adapter 401 is sealed and connected to the high-pressure gas venting pipeline 202 of the reaction chamber 201 and the high-pressure gas outlet 104 of the flow guiding and sealing shell 110, respectively. The safety valve gas adapter 402 is sealed and connected to the safety valve connecting flange 404 and the safety valve gas inlet 107 of the flow guiding and sealing shell 110, respectively, thus achieving the connection.

[0025] like Figure 6 As shown, a detection system for detecting whether air bubbles are generated in the safety liquid is also fixed inside the reaction chamber 201; this can be other existing bubble detection devices such as visual inspection, and in this embodiment, it is an ultrasonic bubble detection system. The detection system includes an ultrasonic transmitting module, an ultrasonic receiving module, a wireless signal transmitter 301, and an alarm unit. The ultrasonic transmitting module emits ultrasonic waves, the ultrasonic receiving module receives the signals, and the signal processing unit compares the theoretical propagation time and actual propagation time of the ultrasonic waves in the safety liquid to detect whether bubbles are generated and sends a gas leak alarm signal. Specifically, the ultrasonic transmitting module includes an ultrasonic transducer 303, an excitation power supply, and a probe guide 302. The ultrasonic transducer 303 emits ultrasonic waves under the action of the excitation power supply and the probe guide 302. The ultrasonic receiving module includes an ultrasonic transducer 305, a temperature sensor 304, a power supply, an ultrasonic power amplifier, and a signal processing unit. The ultrasonic power amplifier converts the signal received by the ultrasonic transducer 305 into an electrical signal. The signal processing unit, based on the safety liquid temperature measured by the temperature sensor 304, compares the theoretical propagation time and actual propagation time of the ultrasonic wave in the liquid under the current temperature conditions to detect the generation of liquid bubbles. Then, it sends a gas leak alarm signal to the alarm unit through the wireless signal transmitter 301 to realize the alarm. The excitation power supply and the power supply together form the power module 5. The excitation power supply is electrically connected to the ultrasonic transducer 303. The power supply is electrically connected to the ultrasonic transducer 305, the wireless signal transmitter 301, the signal processing unit, and the temperature sensor 304. The temperature sensor 304 is installed at the bottom of the reaction chamber 201, and the wireless signal transmitter 301 and the power module 5 are installed at the top of the reaction chamber 201. The wireless signal transmitter 301, the ultrasonic power amplifier, and the signal processing unit are integrated together.

[0026] This embodiment also discloses a detection method for a gas safety valve leakage detection device suitable for LNG-fueled ships, including the following steps: When the gas safety valve leaks, the leaked gas enters the gas automatic switching device through the safety valve connecting flange 404 and the safety valve gas adapter 402, and then enters the reaction chamber 201 of the safety liquid reaction device through the leaked gas passage 102, the leaked gas pipeline 205, and the vent pipe 203 to detect whether there is a gas leak. Specifically, ultrasonic transducer 303 emits ultrasonic waves under the action of excitation power supply and probe guide 302. The ultrasonic power amplifier converts the signal received by ultrasonic transducer 305 into an electrical signal. The signal processing unit detects the generation of liquid bubbles by comparing the theoretical propagation time and actual propagation time of ultrasonic waves in the liquid under the current temperature conditions with the safety liquid temperature measured by temperature sensor 304. The signal processing unit then sends a gas leak alarm signal to the alarm unit through wireless signal transmitter 301. When high-pressure gas appears in the gas safety valve, the high-pressure gas enters the gas automatic switching device through the safety valve connecting flange 404 and the safety valve gas adapter 402, which drives the gas guide fan 101 to rotate counterclockwise, opening the high-pressure gas passage 108, connecting the safety valve gas inlet 107 and the high-pressure gas outlet 104, and the high-pressure gas enters the high-pressure gas venting pipe 202 from the high-pressure gas passage 108, completing the high-pressure venting work of the safety valve.

[0027] After the high-pressure gas is released, under the action of the reset torsion spring 103, the limit slider 109, and the limit groove 105, the gas guide fan 101 rotates and resets to the normal state, so that the leakage gas passage 102 is normally connected to the safety valve gas inlet 107 and the leakage gas outlet 106, and the safety valve gas adapter 402 is connected to the safety liquid reaction device.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the scope of its essence and protection. Such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A gas safety valve leakage detection device suitable for LNG-fueled ships, characterized in that: It includes an automatic gas path switching device and a safety liquid reaction device. The automatic gas path switching device includes a flow guiding and sealing shell. A safety valve gas adapter is provided on the outside of the flow guiding and sealing shell, and a gas flow guiding fan is rotatably connected on the inside. A leakage gas path is provided in the gas flow guiding fan. One end of the leakage gas path is connected to the safety valve gas adapter, and the other end is connected to the safety liquid reaction device. The safety liquid reaction device detects whether there is a gas leak. The gas guide fan is also provided with a high-pressure gas passage. When high-pressure gas appears in the gas safety valve, the high-pressure gas in the gas safety valve pushes the gas guide fan to rotate until one end of the high-pressure gas passage is connected to the gas adapter of the safety valve. At this time, the other end of the high-pressure gas passage is connected to the high-pressure gas venting pipe. The automatic gas path switching device is also equipped with a reset component, which drives the gas guide fan to rotate under normal conditions until the leaking gas path is connected to the gas adapter of the safety valve. The automatic gas passage switching device is also equipped with a limiting component, which restricts the rotation angle of the gas guide fan in the guide sealing shell.

2. The gas safety valve leakage detection device for LNG-fueled ships according to claim 1, characterized in that: The reset component includes a reset torsion spring, one end of which is connected to the flow-guiding sealing shell and the other end of which is connected to the gas flow guide fan.

3. A gas safety valve leakage detection device suitable for LNG-fueled ships according to claim 1, characterized in that: The limiting component includes a limiting slider connected to the outside of the gas guide fan. A limiting groove is provided in the guide sealing shell. The rotation of the gas guide fan causes the limiting slider to slide in the limiting groove. The position of the limiting slider abutting one end of the limiting groove corresponds to the position where the gas guide fan rotates to the position where the leakage gas passage is connected to the safety valve gas adapter. The position of the limiting slider abutting the other end of the limiting groove corresponds to the position where the gas guide fan rotates to the position where the high-pressure gas passage is connected to the safety valve gas adapter.

4. A gas safety valve leakage detection device suitable for LNG-fueled ships according to claim 1, characterized in that: The safety liquid reaction device includes a reaction chamber and a vent tube. One end of the vent tube is connected to a leaking gas pipeline, and the other end extends into the reaction chamber. The end of the leaking gas pipeline away from the vent tube is connected to a leaking gas passage. The reaction chamber contains safety liquid, and some or all of the vents of the vent tube are located in the safety liquid.

5. A gas safety valve leakage detection device suitable for LNG-fueled ships according to claim 4, characterized in that: The reaction chamber is also equipped with a detection system to detect whether air bubbles are generated in the safety liquid.

6. A gas safety valve leakage detection device suitable for LNG-fueled ships according to claim 5, characterized in that: The detection system includes an ultrasonic transmitting module and an ultrasonic receiving module. The ultrasonic transmitting module emits ultrasonic waves, and the ultrasonic receiving module receives the signals. The signal processing unit compares the theoretical propagation time and the actual propagation time of the ultrasonic waves in the safety liquid to detect whether bubbles are generated and sends a gas leak alarm signal.

7. A detection method for a gas safety valve leakage detection device applicable to LNG-fueled ships as described in claim 1, characterized in that: Includes the following steps, When a gas safety valve leaks, the leaking gas enters the automatic gas switching device through the safety valve gas adapter, and then enters the safety liquid reaction device through the leaking gas passage to detect whether there is a gas leak. When high-pressure gas appears in the gas safety valve, the high-pressure gas enters the gas automatic switching device through the safety valve gas adapter, drives the gas guide fan to rotate, opens the high-pressure gas passage, and the high-pressure gas enters the high-pressure gas venting pipe from the high-pressure gas passage to complete the high-pressure venting work of the safety valve.

8. A method for detecting gas safety valve leakage in LNG-fueled ships according to claim 7, characterized in that: After the high-pressure gas is released, the gas guide fan rotates to reset, allowing the leaked gas passage to be normally connected to the safety valve gas adapter and the safety liquid reaction device.

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