Gas safety valve leakage detection device and method suitable for LNG fuel ship

Abstract

The invention discloses a gas safety valve leakage detection device and method suitable for an LNG fuel ship, and relates to the field of ship fuel transportation equipment.The gas safety valve leakage detection device comprises a gas channel automatic switching device and a safety liquid reaction device, the gas channel automatic switching device comprises a flow guide sealing shell, and a safety valve gas adapter is arranged on the outer side of the flow guide sealing shell; a gas guide fan is rotatably connected to the inner side of the safety valve, a leakage gas passage is arranged in the gas guide fan, one end of the leakage gas passage is communicated with the safety valve gas adapter, and the other end is communicated with the safety liquid reaction device; a high-pressure gas passage is further arranged in the gas flow guide fan, high-pressure gas in the gas safety valve pushes the gas flow guide fan to rotate until one end of the high-pressure gas passage is communicated with the safety valve gas adapter, and at the moment, the other end of the high-pressure gas passage is communicated with the high-pressure gas discharge pipeline. Whether the gas safety valve leaks or not can be quickly and accurately judged, and the effect of improving the use safety of the LNG fuel ship gas valve bank is achieved.

Description

Technical Field

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

[0002] With the vigorous promotion of low-carbon economy, development of green shipping and construction of low-carbon ships at home and abroad, LNG has gradually become the main clean energy for ships with its advantages of clean emissions, convenient storage and transportation, and efficient use. However, due to its special hazards such as low temperature, flammability, and explosion, leakage poses great risks to the safety of ship personnel and equipment. The gas valve group is one of the main leakage points during the filling and use of LNG fuel. The simple and effective valve group gas leakage detection technology can provide technical guarantee for the safe navigation of LNG fuel ships.

[0003] At present, the leakage detection of the safety valve of the normal temperature system of LNG fuel ships is mainly carried out by installing sensors or gas sampling detection. Among them, installing a gas sensor at the gas discharge pipe of the safety valve is easy to operate and the technology is mature, but the cost of use is high and the detection accuracy is low in the case of low-concentration leakage. Setting a gas sampling valve at the outlet of the safety valve has high sampling detection accuracy, but the staff needs to carry professional detection instruments with them, which is complicated to operate and there is a risk of gas leakage. Summary of the invention

[0004] The purpose of the present invention is to provide a gas safety valve leakage detection device suitable for LNG fuel ships, which is easy to operate, compact, and has low cost. It can quickly and accurately determine whether the gas safety valve is leaking, thereby improving the safety of the gas valve group of LNG fuel ships.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A gas safety valve leakage detection device suitable for LNG fuel ships, comprising a gas passage automatic switching device and a safety liquid reaction device, the gas passage automatic switching device comprising a flow guiding sealing shell, a safety valve gas adapter is arranged on the outside of the flow guiding sealing shell, a gas flow guiding fan is rotatably connected on the inside, a leakage gas passage is arranged in the gas flow guiding fan, 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 gas leakage; The gas guide fan is also provided 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 safety valve gas adapter. At this time, the other end of the high-pressure gas passage is connected to the high-pressure gas discharge pipeline.

[0006] Furthermore, a reset member is provided in the automatic gas passage switching device, and the reset member drives the gas guide fan to rotate under normal conditions until the leaking gas passage is connected to the safety valve gas adapter.

[0007] Furthermore, the reset member comprises a reset torsion spring, one end of which is connected to the guide sealing shell, and the other end of which is connected to the gas guide fan.

[0008] Furthermore, the gas passage automatic switching device is also provided with a limiter, which limits the rotation angle of the gas guide fan in the guide sealing shell.

[0009] Furthermore, the limit member includes a limit slider connected to the outside of the gas guide fan, and a limit slot is provided in the guide sealing shell. The rotation of the gas guide fan drives the limit slider to slide in the limit slot. The position where the limit slider abuts against one end of the limit slot corresponds to the position where the gas guide fan rotates to connect the leakage gas passage with the safety valve gas adapter, and the position where the limit slider abuts against the other end of the limit slot corresponds to the position where the gas guide fan rotates to connect the high-pressure gas passage with the safety valve gas adapter.

[0010] Furthermore, the safety liquid reaction device includes a reaction chamber and an air hole tube, one end of the air hole tube is connected to the leakage gas pipeline, and the other end extends into the reaction chamber, the leakage gas pipeline is connected to the leakage gas passage away from one end of the air hole tube, the reaction chamber contains safety liquid, and some or all of the air holes of the air hole tube are located in the safety liquid.

[0011] Furthermore, a detection system for detecting whether bubbles are generated in the safety liquid is also provided in the reaction chamber.

[0012] Furthermore, the detection system includes an ultrasonic transmitting module and an ultrasonic receiving module. The ultrasonic transmitting module transmits ultrasonic waves, and the ultrasonic receiving module receives signals. The signal processing unit compares the theoretical propagation time and actual propagation time of ultrasonic waves in the safety liquid, detects the generation of bubbles, and sends a gas leakage alarm signal.

[0013] The present application also discloses a detection method for a gas safety valve leakage detection device applicable to LNG fuel ships, comprising the following steps: When the gas safety valve leaks, the leaked gas enters the gas automatic switching device through the safety valve gas adapter, and then enters the safety liquid reaction device through the leaked gas passage to detect whether there is gas leakage; 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 release pipe from the high-pressure gas passage to complete the high-pressure release work of the safety valve.

[0014] Furthermore, after the high-pressure gas is released, the gas guide fan rotates and resets, so that the leaking gas passage is 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 air hole pipe. The ultrasonic detection device system determines whether there is a leakage risk of the safety valve by monitoring the bubbles generated by the safety liquid and triggers an alarm. When the gas exceeds the set safety pressure of the safety valve, the high-pressure gas automatically switches the gas passage to discharge normally. It can effectively monitor gas leakage without affecting the normal use of the safety valve, thereby improving the safety of the gas valve group of LNG fuel ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a gas safety valve leakage detection device suitable for LNG fuel ships in this embodiment; Figure 2 This is a schematic structural diagram of a gas passage automatic switching device in a gas safety valve leakage detection device applicable to LNG fuel ships according to this embodiment; Figure 3 This is a schematic diagram of a partially disassembled gas passage automatic switching device in a gas safety valve leakage detection device suitable for LNG fuel ships in this embodiment; Figure 4 This is a schematic diagram of an explosion of a safety liquid reaction device in a gas safety valve leakage detection device suitable for LNG fuel ships in this embodiment; Figure 5 This is an internal schematic diagram of a safety liquid reaction device in a gas safety valve leakage detection device suitable for LNG fuel ships according to this embodiment; Figure 6 This is a schematic diagram of an ultrasonic bubble detection system in a gas safety valve leakage detection device suitable for LNG fuel ships in this embodiment; Explanation of the reference numerals: 101, gas guide fan; 102, leakage gas passage; 103, reset torsion spring; 104, high-pressure gas outlet; 105, limiting slide groove; 106, leakage gas outlet; 107, safety valve gas inlet; 108, high-pressure gas passage; 109, limiting slide block; 110, guide sealing shell; 201, reaction chamber; 202, high-pressure gas discharge pipeline; 203, air hole tube; 204, sealing cover; 205; leakage gas pipeline; 301, wireless signal transmitter; 302, detection head guide; 303, ultrasonic transducer 1; 304, temperature sensor; 305, ultrasonic transducer 2; 401, high-pressure gas adapter; 402, safety valve gas adapter; 403, leakage gas adapter; 404, safety valve connecting flange; 5, power module. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, and this embodiment does not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] A gas safety valve leakage detection device suitable for LNG fuel ships, such as Figure 1 As shown, it includes a gas passage automatic switching device and a safety liquid reaction device. When the gas safety valve leaks, the leaked gas enters the safety liquid reaction device, and the safety liquid reaction device alarms the leaked gas; and when the gas exceeds the safety pressure set by the safety valve, the gas passage automatic switching device switches the passage therein to achieve normal discharge, thereby effectively monitoring the gas leakage problem.

[0019] like Figure 2 and Figure 3 As shown, the gas passage automatic switching device includes a flow guiding sealing shell 110, a safety valve connecting flange 404 is connected to the outside of the flow guiding sealing shell 110, the outer end of the safety valve connecting flange 404 is connected to the gas safety valve, and is used to receive the gas leaked from the safety valve, an axial safety valve gas adapter 402 is fixed to the outer periphery of the flow guiding sealing shell 110, and a radial through hole is provided 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 connected to the inner side of the guide seal housing 110. A leakage gas passage 102 is provided on the side of the gas guide fan 101 away from the safety valve connection 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, and the safety liquid reaction device detects whether there is gas leakage. In this embodiment, a safety valve gas inlet 107 and a leakage gas outlet 106 are provided on the periphery of the guide sealing shell 110. Under normal conditions, the safety valve gas inlet 107 and the leakage gas outlet 106 are interconnected through a leakage 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 there. An axial leakage gas adapter 403 is fixed on the periphery of the guide sealing shell 110. The leakage gas outlet 106 is connected to the leakage gas adapter 403, and the leaked gas leaves the gas guide sealing shell 110 from there. The other end of the leakage gas adapter 403 is connected to a 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 discharge pipeline 202 (a high-pressure gas outlet 104 is provided on the periphery of the guide seal housing 110, an axial high-pressure gas adapter 401 is fixed on the periphery of the guide seal housing 110, and the high-pressure gas discharge pipeline 202 is fixed to the 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 discharge pipeline 202 to realize the discharge of high-pressure gas); In this embodiment, the high-pressure gas passage 108 is curved and is opened on one side of the gas guide fan 101. The leakage gas passage 102 is opened on the other side of the gas guide fan 101, and a fan-shaped area is also opened at one end of the leakage gas passage 102 close to the safety valve gas inlet 107. The safety valve gas inlet 107 enters the fan-shaped area and then enters the leakage gas passage 102, so that one side of the fan-shaped area is connected with the leakage gas passage 102, so that the leakage gas passes through the leakage gas passage 102 and the leakage gas outlet 106 to the safety liquid reaction device, and the other side of the fan-shaped area is opposite to the safety valve gas inlet 107, so that when the high-pressure gas is introduced, it can push the gas guide fan 101 as a whole to rotate toward this side.

[0021] like Figure 3 As shown, a reset member is also provided in the gas passage automatic switching device, which 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, the gas guide fan 101 is driven to rotate to one end of the high-pressure gas passage 108 to be connected to the safety valve gas adapter 402 by overcoming the force of the reset member. The reset member realizes the reset of the gas guide fan 101 after the high-pressure gas is introduced. In this embodiment, the reset member includes a reset torsion spring 103, one end of the reset torsion spring 103 is connected to the guide sealing shell 110, and the other end is connected to the through hole in the middle of the gas guide fan 101. The reset member can also be other elastic elements.

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

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

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

[0025] like Figure 6 As shown, a detection system for detecting whether bubbles are generated in the safety liquid is also fixed in the reaction chamber 201; it can be other existing bubble detection devices such as visual detection. 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 transmits ultrasonic waves, and the ultrasonic receiving module receives signals. The signal processing unit compares the theoretical propagation time and the actual propagation time of ultrasonic waves in the safety liquid, detects whether bubbles are generated, and sends a gas leakage alarm signal. Specifically, the ultrasonic transmitting module includes an ultrasonic transducer 303, an excitation power source and a detection head guide 302. The ultrasonic transducer 303 transmits ultrasonic waves under the action of the excitation power source and the detection head guide 302. The ultrasonic receiving module includes an ultrasonic transducer 2 305, 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 2 305 into an electrical signal. The signal processing unit compares the theoretical propagation time and the actual propagation time of the ultrasonic wave in the liquid under the current temperature condition according to the safety liquid temperature measured by the temperature sensor 304, detects the generation of liquid bubbles, and then sends a gas leakage alarm signal to the alarm unit through the wireless signal transmitter 301 to realize the alarm. The excitation power supply and the energy supply constitute a power module 5, and the excitation power supply is electrically connected to the ultrasonic transducer 1 303; the energy supply is electrically connected to the ultrasonic transducer 2 305, 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 applicable to LNG fuel ships, comprising 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 leaking gas passage 102, the leaking gas pipeline 205, and the air hole pipe 203 to detect whether there is gas leakage; Specifically, the ultrasonic transducer 1 303 emits ultrasonic waves under the action of the excitation power supply and the detection head guide 302, and the ultrasonic power amplifier converts the signal received by the ultrasonic transducer 2 305 into an electrical signal. The signal processing unit compares the theoretical propagation time and the actual propagation time of the ultrasonic wave in the liquid under the current temperature condition according to the safety liquid temperature measured by the temperature sensor 304, detects the generation of liquid bubbles, and sends a gas leakage alarm signal to the alarm unit through the 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, pushing 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 discharge pipeline 202 from the high-pressure gas passage 108, completing the high-pressure discharge 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 slide groove 105, the gas guide fan 101 rotates and resets to return to a 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, so that the safety valve gas adapter 402 is connected to the safety liquid reaction device.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A gas safety valve leakage detection device suitable for LNG fuel ships, Features: It includes a gas passage automatic switching device and a safety liquid reaction device. The gas passage automatic switching device includes a flow guide sealing shell. A safety valve gas adapter is provided on the outside of the flow guide sealing shell. A gas guide fan is rotatably connected on the inside. A leakage gas passage is provided in the gas guide fan. 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 gas leakage. The gas guide fan is also provided 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 safety valve gas adapter. At this time, the other end of the high-pressure gas passage is connected to the high-pressure gas discharge pipeline.

2. A gas safety valve leakage detection device suitable for LNG fuel ships according to claim 1, Features: The gas passage automatic switching device is also provided with a reset member, which drives the gas guide fan to rotate under normal conditions until the leaking gas passage is connected to the safety valve gas adapter.

3. A gas safety valve leakage detection device suitable for LNG fuel ships according to claim 2, Features: The reset component comprises a reset torsion spring, one end of which is connected to the flow guide sealing shell, and the other end of which is connected to the gas flow guide fan.

4. A gas safety valve leakage detection device suitable for LNG fuel ships according to claim 1 or 2, Features: The gas passage automatic switching device is also provided with a limiter, which limits the rotation angle of the gas guide fan in the guide sealing shell.

5. A gas safety valve leakage detection device suitable for LNG fuel ships according to claim 4, Features: The limiting member includes a limiting slider connected to the outside of the gas guide fan, and a limiting slide groove is provided in the guide sealing shell. The rotation of the gas guide fan drives the limiting slider to slide in the limiting slide groove. The position where the limiting slider abuts against one end of the limiting slide groove corresponds to the position where the gas guide fan rotates to connect the leakage gas passage with the safety valve gas adapter, and the position where the limiting slider abuts against the other end of the limiting slide groove corresponds to the position where the gas guide fan rotates to connect the high-pressure gas passage with the safety valve gas adapter.

6. A gas safety valve leakage detection device suitable for LNG fuel ships according to claim 1, Features: The safety liquid reaction device includes a reaction chamber and an air hole tube, one end of the air hole tube is connected to the leakage gas pipeline, and the other end extends into the reaction chamber, the leakage gas pipeline is connected to the leakage gas passage away from the end of the air hole tube, the reaction chamber contains safety liquid, and some or all of the air holes of the air hole tube are located in the safety liquid.

7. A gas safety valve leakage detection device suitable for LNG fuel ships according to claim 6, Features: The reaction chamber is also provided with a detection system for detecting whether bubbles are generated in the safety liquid.

8. A gas safety valve leakage detection device suitable for LNG fuel ships according to claim 7, Features: The detection system includes an ultrasonic transmitting module and an ultrasonic receiving module. The ultrasonic transmitting module transmits ultrasonic waves, and the ultrasonic receiving module receives signals. The signal processing unit compares the theoretical propagation time and the actual propagation time of ultrasonic waves in the safety liquid, detects whether bubbles are generated, and sends a gas leakage alarm signal.

9. A detection method for a gas safety valve leakage detection device suitable for LNG fuel ships as claimed in claim 1, Features: The following steps are included: When the gas safety valve leaks, the leaked gas enters the gas automatic switching device through the safety valve gas adapter, and then enters the safety liquid reaction device through the leaked gas passage to detect whether there is gas leakage; 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 release pipe from the high-pressure gas passage to complete the high-pressure release work of the safety valve.

10. A gas safety valve leakage detection method suitable for LNG fuel ships according to claim 9, Features: After the high-pressure gas is released, the gas guide fan rotates and resets, so that the leaking gas path is normally connected to the safety valve gas adapter and the safety liquid reaction device.

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