Marine LNG double-wall pipe interlayer monitoring control system

Abstract

The invention discloses a marine LNG (Liquefied Natural Gas) double-wall pipe interlayer monitoring control system, comprising: a double-wall reinforcing member, which comprises a double-wall supporting telescopic member, an inner wall protection member and a supporting telescopic power member, and the double-wall supporting telescopic member is clamped in an interlayer between an inner wall pipe of a double-wall pipe and an outer wall pipe of the double-wall pipe through the connected inner wall protection member to provide support; the interlayer monitoring part comprises an interlayer monitoring part, a vacuumizing part, a control part and a diffusing part, the interlayer monitoring part monitors the interlayer on the outer wall pipe and transmits a monitoring signal to the control part, the vacuumizing part vacuumizes the interlayer on the outer wall pipe, the control part is electrically connected with the interlayer monitoring part and the vacuumizing part, and the diffusing part is electrically connected with the interlayer monitoring part and the vacuumizing part. And the diffusing part is connected with the vacuumizing part in a penetrating manner, and is used for intensively exhausting leaked gas outwards. The structure design is reasonable, the protection effect on the double-wall pipe is high, the leakage risk of the inner wall pipe can be effectively reduced, and the interlayer vacuum degree of the double-wall pipe can be monitored and controlled sensitively and reliably.

Description

Technical Field

[0001] The present invention relates to the field of shipbuilding technology, and more specifically, to a monitoring and control system for the interlayer of a marine LNG double-walled pipe. Background Art

[0002] In recent years, with the increasing global demand for clean energy, LNG fuel ships have developed rapidly. As of the end of 2023, there are 772 operating LNG fuel ships globally, and another 341 new ship orders. This means that by the end of 2028, the total number of LNG fuel ships in operation will reach 1,154. To support the development of LNG fuel ships, 185 ports globally currently supply LNG fuel, and this number will continue to increase next year. In the next 10 years, the LNG industry will play an important long-term role in maritime decarbonization.

[0003] Currently, the pipes in the interlayer of the upper tank, the pipes before and after the GVU, and the open-air pipes on the deck of LNG fuel ships all adopt the form of double-walled pipes. Among them, the inner pipe is used to transport the medium in use (such as cryogenic, flammable, and explosive media like LNG fuel, liquid nitrogen, and liquid oxygen), and the outer pipe maintains a vacuum. The double-walled pipes are connected by welding, but in actual use, the seals between the inner wall pipe and the outer wall pipe may fail due to various reasons. For example, long-term vibration, temperature changes, material aging, or welding defects may all lead to a decline in sealing performance. Once the seal of the inner pipe or the outer wall pipe fails, serious safety hazards will be triggered. If the seal of the inner wall pipe fails, LNG fuel may leak into the interlayer of the double-walled pipe, and the low temperature will cause the freezing and blockage of equipment such as valves and instruments, and the entire system will not be able to operate, and the explosion risk will increase; if the seal of the outer wall pipe fails, external gas may enter the interlayer, affecting the normal operation of the pipeline and the safety of the system. Therefore, it is necessary to solve the problem of seal failure of the inner wall pipe and the outer wall pipe.

[0004] Moreover, the design of the vacuum pumping pipeline on existing LNG fuel ships is relatively simple, which can only meet the basic functional use. The entire system lacks safety protection measures and lacks emergency response capabilities in case of sudden situations. The specific drawbacks are as follows: 1) There is no early warning and control for leakage in the pipeline interlayer. Double-walled pipes are generally connected to important equipment such as storage tanks and main engines. Once leakage occurs and is not detected in time, serious accidents will occur. 2) The pressure-bearing plugs mostly adopt mechanical designs, and the opening pressure cannot be accurately set, which is prone to pressure accumulation. A large amount of leakage will cause LNG spraying, posing a safety hazard. At the same time, it is difficult to operate the pressure-bearing plugs to restore them, which is not convenient for later maintenance. Summary of the Invention

[0005] In order to overcome the above defects, the present invention provides a monitoring and control system for the interlayer of a marine LNG double-walled pipe, and specifically adopts the following technical solutions:

[0006] A marine LNG double-wall pipe interlayer monitoring and control system, comprising:

[0007] A double-wall reinforcement member, which is arranged on the double-wall pipe. The double-wall reinforcement member includes a double-wall support telescopic member, an inner wall protection member, and a support telescopic power member. The double-wall support telescopic member provides support in the interlayer between the inner wall pipe and the outer wall pipe of the double-wall pipe by clamping the connected inner wall protection member, and the support telescopic power member provides support power for the connected double-wall support telescopic member;

[0008] An interlayer monitoring member, which is arranged on the double-wall pipe. The interlayer monitoring member includes an interlayer monitoring piece, a vacuum pumping piece, a control piece, and a relief piece. The interlayer monitoring piece monitors the interlayer on the outer wall pipe and transmits the monitoring signal to the control piece. The vacuum pumping piece pumps the interlayer on the outer wall pipe. The control piece is electrically connected to the interlayer monitoring piece and the vacuum pumping piece respectively to receive the monitoring signal and send out the control signal. The relief piece is connected to the vacuum pumping piece in a through manner and is used to centrally discharge the leaked gas to the outside.

[0009] Preferably, the double-wall support telescopic member includes an inner wall telescopic support member, a communication buffer support member, and an outer wall telescopic support member. The communication buffer support member is arranged on the inner wall telescopic support member, and the outer wall telescopic support member is arranged on the communication buffer support member.

[0010] Preferably, the inner wall telescopic support member includes an inner wall support seat, an inner wall support pipe, and an inner wall support shaft. One end of the inner wall support pipe is connected to the inner side wall of the inner wall support seat in a through manner, and a plurality of the inner wall support pipes are evenly distributed circumferentially around the inner wall support seat; one end of the inner wall support shaft is slidably and sealingly installed in the inner wall support pipe, and a plurality of the inner wall support shafts correspond to the plurality of the inner wall support pipes one by one.

[0011] Preferably, the communication buffer support member includes a connection buffer male pipe and a connection buffer female pipe. One end of the connection buffer male pipe is connected to the outer side wall of the inner wall support seat in a through manner, and a plurality of the connection buffer male pipes are evenly distributed circumferentially around the inner wall support seat; one end of the connection buffer female pipe is axially slidably and sealingly sleeved on the other end of the connection buffer male pipe, and a plurality of the connection buffer female pipes correspond to the plurality of the connection buffer male pipes one by one.

[0012] Preferably, the outer wall telescopic support member includes an outer wall support base, an outer wall support tube, an outer wall support shaft, and an outer wall foot pad. The inner wall of the outer wall support base is connected to the other end of the connection buffer main pipe in a penetrating manner, and the axis of the outer wall support base coincides with the axis of the inner wall support base; one end of the outer wall support tube is connected to the outer side wall of the outer wall support base in a penetrating manner, and a plurality of the outer wall support tubes are evenly distributed circumferentially around the outer wall support base; one end of the outer wall support shaft is slidably and sealingly installed in the outer wall support tube, and a plurality of the outer wall support shafts correspond to a plurality of the outer wall support tubes one by one; the inner wall of the outer wall foot pad is arranged at the other end of the outer wall support shaft, and a plurality of the outer wall foot pads are correspondingly arranged on a plurality of the outer wall support shafts one by one.

[0013] Preferably, the inner wall protection member includes an inner wall protection plate, the outer side wall of the inner wall protection plate is detachably arranged at the other end of the inner wall support shaft, and a plurality of the inner wall protection plates are correspondingly arranged on a plurality of the inner wall support shafts one by one.

[0014] Preferably, the support telescopic power member includes a communicating pressure supply pipe, one end side wall of the communicating pressure supply pipe is connected to the inner wall support tubes of a plurality of the double-wall support telescopic members in a penetrating manner, and the other end of the communicating pressure supply pipe is detachably connected to a pressure pump in a penetrating manner.

[0015] Preferably, the interlayer monitoring member includes a pneumatic control valve, a temperature sensor, and a three-way interface. The pneumatic control valve is arranged on the outer wall pipe, receives a control signal, and is used to control the cutting off and opening of the vacuum pipeline of the interlayer; the temperature transmitter is arranged on the outer wall pipe to monitor the temperature change of the interlayer and transmit the information to the control member, and the three-way interface is connected to the outer wall pipe in a penetrating manner and is connected to the vacuum pumping member in a penetrating manner.

[0016] Preferably, the vacuum pumping member includes a vacuum pumping pipe, a vacuum pumping valve, a blasting device, a bypass valve, a pressure sensor, and a one-way check valve. One end of the vacuum pumping pipe is connected to the three-way interface in a penetrating manner, and the other end of the vacuum pumping pipe is connected to the discharge member in a penetrating manner. The vacuum pumping valve is arranged on the vacuum pumping pipe, and the vacuum pumping valve is used to control the vacuum degree in the interlayer and perform a vacuum pumping operation on the interlayer pipeline according to the design requirements; the blasting device is arranged on the vacuum pumping pipe, and the bypass valve is connected to the vacuum pumping pipeline before and after the blasting device in a penetrating manner, so that the bypass valve is connected in parallel with the blasting device; the pressure sensor is arranged in the vacuum pumping pipe in a penetrating manner and is used to monitor the pressure change in the pipeline and transmit the information to the control member; the one-way check valve is arranged on the vacuum pumping pipe.

[0017] Preferably, the control member includes a PLC control cabinet and a background operation computer. The PLC control cabinet is electrically connected to the pressure transmitter, the temperature sensor, and the pneumatic control valve respectively, and is used to receive the signals transmitted by the pressure sensor and the temperature sensor. At the same time, it also sends control signals to interlock the pneumatic control valve in the vacuum pipeline system for cut-off operation. The background operation computer is electrically connected to the PLC control cabinet and is used to monitor the state of the medium in the pipeline in real time for the operator to view. The discharge member includes a ventilation mast, and the ventilation mast is connected to the other end of the extraction vacuum pipe in a penetrating manner.

[0018] The present invention has at least the following beneficial effects:

[0019] 1) The structure design of the marine LNG double-wall pipe interlayer monitoring and control system of the present invention is reasonable, has a strong protective effect on the double-wall pipe, can effectively reduce the risk of inner wall pipe leakage, and is sensitive and reliable in monitoring and controlling the interlayer vacuum degree of the double-wall pipe;

[0020] 2) The marine LNG double-wall pipe interlayer monitoring and control system of the present invention is provided with double-wall reinforcement members. The double-wall reinforcement members are embedded and supported in the interlayer and provide support for both the inner wall pipe and the outer wall pipe at the same time. When the outer wall of the outer wall pipe is vibrated, shock absorption and damping treatment will be carried out for the inner wall pipe through the outer wall foot pads, the pressure medium pumped by the pressure pump, and the inner wall protection plate, reducing the risk of inner wall pipe leakage;

[0021] 3) The marine LNG double-wall pipe interlayer monitoring and control system of the present invention is provided with a blasting device. The pressure value of the interlayer vacuum is ensured by a highly sensitive bursting disc. The higher the vacuum degree, the lower the heat transfer coefficient of the entire system pipeline, ensuring good pipeline operation. At the same time, a bypass valve is set to ensure that the pressures before and after the bursting disc are the same during vacuum pumping, and there will be no bursting due to the negative pressure of vacuum pumping. During operation, the temperature sensor and pressure sensor in the pipeline system are used to monitor the background of the entire vacuum pumping system. When the pipeline interlayer leaks, the temperature sensor will give an alarm warning. At this time, the entire system is still in operation. When the blasting device bursts and the pressure sensor reaches the specified parameters, the PLC control system will close the pneumatic control valve, and the entire system will enter the maintenance state. The bursting disc can be repaired and replaced through the gripper. The entire system is protected by multiple layers to ensure the stable operation of the entire system pipeline.

[0022] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the front view of the double-wall reinforcement member in the marine LNG double-wall pipe interlayer monitoring and control system of the present invention;

[0024] Figure 2 This is the front view of the side of the double-wall reinforcement in the monitoring and control system of the double-wall of the marine LNG pipe of the present invention;

[0025] Figure 3 This is the schematic diagram of the left three-dimensional structure of the double-wall reinforcement in the monitoring and control system of the double-wall of the marine LNG pipe of the present invention;

[0026] Figure 4 This is the schematic diagram of the right three-dimensional structure of the double-wall reinforcement in the monitoring and control system of the double-wall of the marine LNG pipe of the present invention;

[0027] Figure 5 This is in the monitoring and control system of the double-wall of the marine LNG pipe of the present invention Figure 1 The schematic diagram of the three-dimensional structure of the cross-section in the A-A direction;

[0028] Figure 6 This is in the monitoring and control system of the double-wall of the marine LNG pipe of the present invention Figure 5 The partial enlarged view of B;

[0029] Figure 7 This is the schematic diagram of the principle of the interlayer monitoring component in the monitoring and control system of the double-wall of the marine LNG pipe of the present invention.

[0030] Wherein: 1 Inner wall telescopic support member, 1-1 Inner wall support base, 1-2 Inner wall support pipe, 1-3 Inner wall support shaft, 2 Connecting buffer support member, 2-1 Connecting buffer male pipe, 2-2 Connecting buffer female pipe, 3 Outer wall telescopic support member, 3-1 Outer wall support base, 3-2 Outer wall support pipe, 3-3 Outer wall support shaft, 3-4 Outer wall foot pad, 4 Inner wall protection plate, 5 Connecting pressure supply pipe, 6 Interlayer monitoring member, 6-1 Double-wall pipe, 6-2 Pneumatic control valve, 6-3 Temperature sensor, 7 Vacuum pumping member, 7-1 Vacuum pumping pipe, 7-2 Vacuum pumping valve, 7-3 Blasting device, 7-4 Bypass valve, 7-5 Pressure sensor, 7-6 One-way check valve, 8 Control member, 8-1 PLC control cabinet, 8-2 Background operation computer, 9 Vent mast. Specific embodiments

[0031] Hereinafter, the technical solutions of the present invention will be described in detail by way of examples with reference to the accompanying drawings. It should be noted here that the description of these example embodiments is for helping to understand the present invention, but does not constitute a limitation to the present invention.

[0032] In this text, the term "and / or" only describes the associated relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, B exists alone, and both A and B exist simultaneously. The term " / and" in this text describes another associated object relationship, indicating that there can be two relationships. For example, A / and B can represent two situations: A exists alone, and both A and B exist alone. In addition, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0033] According to Figures 1-6 As shown, a marine LNG double-wall pipe interlayer monitoring and control system includes a double-wall reinforcement member and an interlayer monitoring member, and both the double-wall reinforcement member and the interlayer monitoring member are arranged on the double-wall pipe 6-1. The double-wall reinforcement member includes a double-wall support telescopic member, an inner wall protection member, and a support telescopic power member. The inner wall protection member and the support telescopic power member are both arranged on the double-wall support telescopic member, and the double-wall support telescopic member is embedded and supported in the interlayer between the inner wall pipe and the outer wall pipe of the double-wall pipe 6-1 through the inner wall protection member to provide support and buffering.

[0034] The double-wall support telescopic member includes an inner wall telescopic support member 1, a communication buffer support member 2, and an outer wall telescopic support member 3. The communication buffer support member 2 is arranged on the inner wall telescopic support member 1, and the outer wall telescopic support member 3 is arranged on the communication buffer support member 2. The inner wall telescopic support member 1 includes an inner wall support seat 1-1, an inner wall support pipe 1-2, and an inner wall support shaft 1-3. The inner wall support seat 1-1 is in a ring-shaped tubular shape, and the inner diameter of the inner circle of the inner wall support seat 1-1 is greater than the outer diameter of the inner wall pipe. One end of the inner wall support pipe 1-2 is connected through and on the inner side wall of the inner wall support seat 1-1, and the axis of the inner wall support pipe 1-2 coincides with the radial line of the inner wall support seat 1-1. There are four inner wall support pipes 1-2, and the four inner wall support pipes 1-2 are evenly distributed circumferentially around the inner wall support seat 1-1. One end of the inner wall support shaft 1-3 is hermetically and slidably embedded in the inner wall support pipe 1-2, so that the inner wall support shaft 1-3 can slide axially and hermetically in the inner wall support pipe 1-2. There are four inner wall support shafts 1-3, and the four inner wall support shafts 1-3 correspond to the four inner wall support pipes 1-2 one by one. As an option, a first sliding sealing ring is sleeved on the outer wall of the inner wall support shaft 1-3, and the inner wall support shaft 1-3 axially seals and slides in the inner wall support pipe 1-2 through the first sliding sealing ring. It should be noted that when the pressure in the inner wall support seat 1-1 increases, it will push the inner wall support shaft 1-3 to slide outwards and hermetically in the inner wall support pipe 1-2.

[0035] The connected buffer support member 2 includes a connecting buffer male pipe 2-1 and a connecting buffer female pipe 2-2. One end of the connecting buffer male pipe 2-1 is connected through and on the outer wall of the inner wall support seat 1-1, and the axis of the connecting buffer male pipe 2-1 coincides with the radial line of the inner wall support seat 1-1. Further, there are four connecting buffer male pipes 2-1, and the four connecting buffer male pipes 2-1 are evenly distributed circumferentially around the inner wall support seat 1-1. One end of the connecting buffer female pipe 2-2 is axially slidably and sealingly sleeved on the other end of the connecting buffer male pipe 2-1, so that the connecting buffer male pipe 2-1 can axially seal and slide relative to the connecting buffer female pipe 2-2. As an option, a second sliding sealing ring is sleeved on the connecting buffer male pipe 2-1 to improve the axial sealing sliding of the connecting buffer male pipe 2-1 in the connecting buffer female pipe 2-2. Further, the four connecting buffer female pipes 2-2 are in one-to-one correspondence and cooperation with the four connecting buffer male pipes 2-1. To improve the connection buffer support between the inner wall telescopic support member 1 and the outer wall telescopic support member 3.

[0036] The outer wall telescopic support member 3 includes an outer wall support seat 3-1, an outer wall support pipe 3-2, an outer wall support shaft 3-3 and an outer wall foot pad 3-4. The outer wall support seat 3-1 is in a ring-shaped tubular shape. The inner diameter of the outer wall support seat 3-1 is larger than the outer diameter of the inner wall support seat 1-1, and the outer diameter of the outer wall support seat 3-1 is smaller than the inner diameter of the outer wall pipe. The inner wall of the outer wall support seat 3-1 is fixedly and through-connected to the other end of the connecting buffer female pipe 2-2, and the axis of the outer wall support seat 3-1 coincides with the axis of the inner wall support seat 1-1.

[0037] One end of the outer wall support pipe 3-2 is connected through and on the outer side wall of the outer wall support seat 3-1, and the axis of the outer wall support pipe 3-2 coincides with the radial line of the outer wall support seat 3-1. There are four outer wall support pipes 3-2, and the four outer wall support pipes 3-2 are evenly distributed circumferentially around the outer wall support seat 3-1. One end of the outer wall support shaft 3-3 is hermetically and slidably fitted inside the outer wall support pipe 3-2, so that the outer wall support shaft 3-3 can slide axially and hermetically inside the outer wall support pipe 3-2. There are four outer wall support shafts 3-3, and the four outer wall support shafts 3-3 correspond to the four outer wall support pipes 3-2 one by one. As an option, a third sliding sealing ring is sleeved outside the outer wall support shaft 3-3, and the outer wall support shaft 3-3 axially seals and slides inside the outer wall support pipe 3-2 through the third sliding sealing ring. It should be noted that when the pressure inside the outer wall support seat 3-1 increases, it will push the outer wall support shaft 3-3 to slide outwards and hermetically inside the outer wall support pipe 3-2. The outer wall foot pad 3-4 is in the shape of an arc plate, and the inner wall of the outer wall foot pad 3-4 is arranged at the other end of the outer wall support shaft 3-3. The four outer wall foot pads 3-4 are arranged on the four outer wall support shafts 3-3 one by one. When the outer wall support shaft 3-3 extends, it will be supported on the inner wall of the outer wall pipe through the four outer wall foot pads 3-4. As an option, the outer wall backing plate is in the shape of a hard rubber plate.

[0038] The inner wall protection member includes an inner wall protection plate 4. The inner wall protection plate 4 is in the shape of a long strip arc plate. The outer side wall of the inner wall protection plate 4 is detachably arranged at the other end of the inner wall support shaft 1-3, and the axis of the inner wall protection plate 4 can coincide with the axis of the inner wall support seat 1-1. Further, the central angle of the inner wall protection plate 4 is 90 degrees. There are four inner wall protection plates 4, and the four inner wall protection plates 4 are arranged on the four inner wall support shafts 1-3 one by one. It should be noted that the inner wall protection plate 4 freely selects the appropriate arc size of the inner wall protection plate 4 according to the outer diameter size of the inner wall pipe, so that the four inner wall protection plates 4 can completely wrap outside the inner wall pipe, improving the protection performance of the inner wall pipe. As an option, an elastic rubber body is arranged on the inner wall of the inner wall protection plate 4 to improve the protection effect on the inner wall pipe.

[0039] It should be noted that multiple sets of the double-wall support telescopic members are sleeved and connected axially at equal intervals along the outer edge of the inner wall protection member. The multiple sets of double-wall support telescopic members are evenly distributed in the interlayer between the inner wall pipe and the outer wall pipe, providing connection support for the outer wall pipe and the inner wall pipe.

[0040] The support telescopic power member includes a communicating pressure supply pipe 5, which is distributed along the inner wall protection plate 4. One end axis of the communicating pressure supply pipe 5 coincides with the axis of the inner wall protection plate 4. At the same time, the side wall of the communicating pressure supply pipe 5 is connected to the inner wall support pipes 1-2 of multiple double-wall support telescopic members in a penetrating manner. The free end of the communicating pressure supply pipe 5 penetrates out of the outer wall pipe, and the communicating pressure supply pipe 5 is connected to a pressure pump in a penetrating manner. The pressure pump transports a pressure medium to the inner wall support pipes 1-2 and the outer wall support pipes 3-2 through the communicating pressure supply pipe 5, thereby increasing the pressure inside the inner wall support pipes 1-2 and the outer wall support pipes 3-2, and then pushing the inner wall support shafts 1-3 and the outer wall support shafts 3-3 to slide outwards, so as to push the outer wall foot pad 3-4 against the inner wall of the outer wall pipe, and push the inner wall protection plate 4 to wrap around the outer of the inner wall pipe. As an option, the pressure pump is a pneumatic pressure pump or a hydraulic pressure pump. After pressurizing the communicating pressure supply pipe 5, the connection with the pressure pump can be disconnected, and the pressure can be maintained through the valve on the communicating pressure supply pipe 5. When maintenance is required, it can be disassembled after depressurizing the communicating pressure supply pipe 5. When the outer wall pipe is vibrated externally, damping buffering will be carried out through the pressure medium.

[0041] As shown in Figure 7 The interlayer monitoring member includes an interlayer monitoring element 6, a vacuum pumping element 7, a control element 8 and a relief element. The interlayer monitoring element 6, the vacuum pumping element 7 and the relief element are all arranged on the outer wall pipe. The interlayer monitoring element 6 includes a pneumatic control valve 6-2, a temperature sensor 6-3 and a three-way interface. The pneumatic control valve 6-2, the temperature sensor 6-3 and the three-way interface are all arranged on the outer wall pipe. The pneumatic control valve 6-2 is used to cut off and open the vacuum pipeline, receive a control signal, and control the flow of the medium. The temperature sensor 6-3 is used to monitor the temperature change in the interlayer pipeline and transmit the information to the control system. Once a leak occurs in the interlayer between the outer wall pipe and the inner wall pipe, the temperature sensor 6-3 will trigger an alarm system to send a danger signal. At the same time, it can interlock with the control system to cut off the pneumatic control valve 6-2 of the corresponding pipeline. The three-way interface is connected to the outer pipe for easy vacuum pumping.

[0042] The vacuum pumping component 7 includes a vacuum pumping pipe 7-1, a vacuum pumping valve 7-2, a blasting device 7-3, a bypass valve 7-4, a pressure sensor 7-5, and a one-way check valve 7-6. One end of the vacuum pumping pipe 7-1 is connected to the three-way interface in a penetrating manner, and the other end of the vacuum pumping pipe 7-1 is connected to the venting component in a penetrating manner. The vacuum pumping valve 7-2 is arranged on the vacuum pumping pipe 7-1, and the vacuum pumping valve 7-2 is used to control the vacuum degree in the interlayer between the inner wall pipe and the outer wall pipe, and perform vacuum pumping operation on the interlayer pipeline according to the design requirements. The blasting device 7-3 is arranged on the vacuum pumping pipe 7-1, and the blasting device 7-3 contains a bursting disc, which is selected according to the design requirements. When the interlayer pressure exceeds the set value, the bursting disc bursts, and the gas in the vacuum pumping pipe 7-1 is in a through path. The blasting device 7-3 is equipped with a holder, and the bursting disc can be disassembled and replaced. The bypass valve 7-4 is connected to the vacuum pumping pipe 7-1 before and after the blasting device 7-3 in a penetrating manner, so that the bypass valve 7-4 is in parallel with the blasting device 7-3. During vacuum pumping, the bypass valve 7-4 is opened, and the pressures before and after the bursting disc are the same. The pressure sensor 7-5 is arranged on the vacuum pumping pipe 7-1 in a penetrating manner, and is used to monitor the pressure change in the pipeline and transmit the information to the control component 8. The one-way check valve 7-6 is arranged on the vacuum pumping pipe 7-1, and the one-way check valve 7-6 ensures the one-way flow of the medium, prevents the reverse pressure of the pressure of the vent mast 9 from causing false alarms, and at the same time, during vacuum pumping, it can ensure that the pressure between the bursting disc and the check valve is synchronously in a vacuum state.

[0043] The blasting device 7-3 is internally provided with a bursting disc, which is selected according to the pressure value and can accurately sense the pressure value of the interlayer. The pressure sensor 7-5 can detect the pressure condition in the interlayer in real time. The bypass valve 7-4 is set to ensure that the pressures before and after the bursting disc are the same during vacuum pumping, avoid the bursting of the bursting disc caused by negative pressure, and cause false alarms. A one-way check valve 7-6 is arranged at the end of the vacuum pumping pipe 7-1 to avoid the reverse pressure of other pressures discharged to the vent mast 9, resulting in false pressure alarms.

[0044] The control member 8 includes a PLC control cabinet 8-1 and a background operation computer 8-2. The PLC control cabinet 8-1 is electrically connected to the pressure actuator, the temperature sensor 6-3, and the pneumatic control valve 6-2 respectively, and is used to receive the signals transmitted by the pressure sensor 7-5 and the temperature sensor 6-3. At the same time, it can also send out control signals to interlock the pneumatic control valve 6-2 in the vacuum pipeline system for a cut-off operation. The background operation computer 8-2 is electrically connected to the PLC control cabinet 8-1 and is used to monitor the state of the medium in the pipeline in real time for the operator to view. The PLC control cabinet 8-1 is used to receive and transmit signals. The operator identifies and operates on the received information in the background. The pressure and temperature information in the interlayer pipeline is monitored in real time on the background operation computer 8-2 to confirm the safety of the entire system.

[0045] The venting member includes a vent mast 9, and the vent mast 9 is connected in a through manner to the other end of the evacuation pipe 7-1. The vent mast 9 is used to receive the natural gas discharged from the interlayer pipeline system and perform centralized safe discharge treatment.

[0046] After all pipelines and equipment are installed as required, the bypass valve 7-4 is opened, and the evacuation valve 7-2 performs an evacuation operation according to the set pressure. After the requirements are met, the evacuation valve 7-2 of the pipeline is closed, and the bypass valve 7-4 is closed. The temperature sensor 6-3 and the pressure sensor 7-5 are checked, and the entire system enters a normal operation state. When a leak occurs in the pipeline interlayer, the temperature sensor 6-3 transmits a temperature signal to the background, triggering an alarm. At the same time, the value of the pressure sensor 7-5 is observed. When the pressure value reaches the specified parameter, the PLC control cabinet 8-1 issues an instruction to cut off the pneumatic control valve 6-2 and interlock the emergency stop device of the entire system. The evacuation system enters a maintenance state. The blasting device 7-3 is removed, and the internal bursting disc is replaced. The one-way check valve 7-6 can prevent gas from flowing back. After the maintenance is completed, the blasting device 7-3 is reinstalled, and the pneumatic control valve 6-2 is opened, and the entire system enters the operation state again.

[0047] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated and described examples here.

Claims

1. A marine LNG double-walled pipe interlayer monitoring and control system, characterized in that: include: A double-wall reinforcement member, which is arranged on a double-wall tube, the double-wall reinforcement member comprises a double-wall support telescopic member, an inner wall protection member and a support telescopic power member, the double-wall support telescopic member is clamped in the interlayer between the inner wall tube of the double-wall tube and the outer wall tube of the double-wall tube through the connected inner wall protection member to provide support, and the support telescopic power member provides support power for the connected double-wall support telescopic member; The interlayer monitoring component is arranged on the double-walled tube, and the interlayer monitoring component includes an interlayer monitoring component, a vacuum component, a control component and a release component. The interlayer monitoring component monitors the interlayer on the outer wall tube and transmits the monitoring signal to the control component. The vacuum component vacuums the interlayer on the outer wall tube. The control component is electrically connected to the interlayer monitoring component and the vacuum component respectively to receive monitoring signals and send control signals. The release component is through-connected with the vacuum component to discharge the leaked gas to the outside in a concentrated manner.

2. The marine LNG double-walled pipe interlayer monitoring and control system according to claim 1 is characterized in that: The double-wall support telescopic member includes an inner wall telescopic support member, a connecting buffer support member and an outer wall telescopic support member. The connecting buffer support member is arranged on the inner wall telescopic support member, and the outer wall telescopic support member is arranged on the connecting buffer support member.

3. The monitoring and control system for the marine LNG double-walled pipe sandwich according to claim 2 is characterized in that: The inner wall telescopic support member includes an inner wall support seat, an inner wall support tube and an inner wall support shaft. One end of the inner wall support tube is connected to the inner wall of the inner wall support seat, and multiple inner wall support tubes are evenly distributed around the inner wall support seat; one end of the inner wall support shaft is slidably sealed and embedded in the inner wall support tube, and the multiple inner wall support shafts correspond to the multiple inner wall support tubes one by one.

4. The marine LNG double-walled pipe interlayer monitoring and control system according to claim 3 is characterized in that: The connecting buffer support member includes a connecting buffer male pipe and a connecting buffer female pipe, one end of the connecting buffer male pipe is connected to the outer wall of the inner wall support seat, and multiple connecting buffer male pipes are evenly distributed around the inner wall support seat; one end of the connecting buffer female pipe is axially slidingly sealed and sleeved on the other end of the connecting buffer male pipe, and multiple connecting buffer female pipes correspond to multiple connecting buffer male pipes one by one.

5. The marine LNG double-walled pipe interlayer monitoring and control system according to claim 4 is characterized in that: The outer wall telescopic support member includes an outer wall support seat, an outer wall support tube, an outer wall support shaft and an outer wall foot. The inner wall of the outer wall support seat is through-connected to the other end of the connecting buffer mother tube, and the axis of the outer wall support seat coincides with the axis of the inner wall support seat; one end of the outer wall support tube is through-connected to the outer side wall of the outer wall support seat, and a plurality of the outer wall support tubes are evenly distributed around the outer wall support seat; one end of the outer wall support shaft is slidingly sealed and embedded in the outer wall support tube, and a plurality of the outer wall support shafts correspond one by one to a plurality of the outer wall support tubes; the inner wall of the outer wall foot is arranged on the other end of the outer wall support shaft, and a plurality of the outer wall feet are arranged one by one on a plurality of the outer wall support shafts.

6. The marine LNG double-walled pipe interlayer monitoring and control system according to any one of claims 3 to 5, characterized in that: The inner wall protection member comprises an inner wall protection plate, the outer side wall of the inner wall protection plate is detachably arranged on the other end of the inner wall support shaft, and a plurality of the inner wall protection plates are arranged one by one on a plurality of the inner wall support shafts.

7. The marine LNG double-walled pipe interlayer monitoring and control system according to any one of claims 3 to 5, characterized in that: The supporting telescopic power part includes a connecting pressure supply pipe, a side wall of one end of the connecting pressure supply pipe is connected to the inner wall support pipes of the plurality of double-walled supporting telescopic parts, and the other end of the connecting pressure supply pipe is detachably connected to the pressure pump.

8. The marine LNG double-walled pipe interlayer monitoring and control system according to any one of claims 1 to 5, characterized in that: The interlayer monitoring component includes a pneumatic control valve, a temperature sensor and a three-way interface. The pneumatic control valve is on the outer wall tube and receives a control signal to control the cutting and opening of the vacuum pipeline of the interlayer. The temperature transmitter monitors the temperature changes of the interlayer on the outer wall tube and transmits the information to the control component. The three-way interface is through-connected to the outer wall tube and is through-connected to the vacuum pumping component.

9. The marine LNG double-walled pipe interlayer monitoring and control system according to claim 8 is characterized in that: The vacuum pumping component includes a vacuum pumping tube, a vacuum pumping valve, a blasting device, a bypass valve, a pressure sensor and a one-way check valve. One end of the vacuum pumping tube is connected to the three-way interface, and the other end of the vacuum pumping tube is connected to the release component. The vacuum pumping valve is arranged on the vacuum pumping tube. The vacuum pumping valve is used to control the vacuum degree in the interlayer and perform vacuum pumping operations on the interlayer pipeline according to design requirements; the blasting device is arranged on the vacuum pumping tube, and the bypass valve is connected to the vacuum pumping pipeline before and after the blasting device, so that the bypass valve is connected in parallel with the blasting device; the pressure sensor is arranged on the vacuum pumping tube, and is used to monitor the pressure changes in the pipeline and transmit the information to the control component; the one-way check valve is arranged on the vacuum pumping tube.

10. The marine LNG double-walled pipe interlayer monitoring and control system according to claim 9, characterized in that: The control component includes a PLC control cabinet and a background operation computer. The PLC control cabinet is electrically connected to the pressure transmitter, the temperature sensor and the pneumatic control valve respectively, and is used to receive the signals transmitted by the pressure sensor and the temperature sensor, and also sends out a control signal to interlock the pneumatic control valve in the vacuum pipeline system to perform a cut-off operation; the background operation computer is electrically connected to the PLC control cabinet, and is used to monitor the status of the medium in the pipeline in real time for the operator to view; the release component includes a ventilation mast, and the ventilation mast is through-connected to the other end of the vacuum pipe.

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