A ship bottom monitoring and treatment system for cargo holds of a cryogenic gas carrier

Abstract

The utility model discloses a ship bottom monitoring and processing system of cargo hold place of low temperature gas ship relates to ship safety technical field, include: two -phase injection pump, sensor component and ship central controller, two -phase injection pump sets up in the bottom of the hold of cargo hold place, and its drive mouth is connected with the fire fighting sea water pipeline, liquid cargo pipeline and compressed air pipeline of cargo hold place through drive pipeline respectively, the suction port is connected with the sewage well in the cargo hold place, and the discharge port is connected with the outboard discharge pipeline and liquid cargo collection pipeline through the discharge pipeline respectively, sensor component includes liquid level sensor, temperature sensor and flammable medium sensor, and all are electrically connected with ship central controller, the utility model discloses a ship bottom monitoring and processing system of cargo hold place of low temperature gas ship can effectively realize condensate water discharge, residual water emptying and emergency leakage disposal when liquid cargo leakage, has compact structure, function integration higher advantage.

Description

Technical Field

[0001] This utility model relates to the field of ship safety system technology, and in particular to a bottom monitoring and processing system for the cargo hold space of a cryogenic gas carrier. Background Technology

[0002] The independent cargo hold space on cryogenic gas carriers is a critical area for ship safety. Traditionally, this space is equipped with only simple bilge water pumps for periodic manual condensate drainage, relying on independent level switches for leak alarms. This design has significant drawbacks: First, existing drainage systems are prone to leaving residual moisture after drainage, which can freeze at low temperatures, potentially clogging or damaging the system (especially the pumps); second, combustible gas detection alarms, level alarms, and bilge water drainage systems are independent of each other, failing to form a linkage mechanism, resulting in low emergency response efficiency and reliance on crew experience; third, existing pumping systems cannot simultaneously and safely and effectively handle multiple media such as conventional seawater, volatile leaking liquid cargo, and compressed air used for system maintenance, lacking an integrated, multi-functional solution. Therefore, there is an urgent need for a safety management system that integrates condition monitoring, intelligent judgment, and proactive response. Utility Model Content

[0003] This invention addresses the problems existing in the prior art by proposing a bottom monitoring and processing system for the cargo hold space of a cryogenic gas carrier.

[0004] The technical means adopted in this utility model are as follows: A bottom monitoring and processing system for the cargo hold space of a cryogenic gas carrier, comprising: Two-phase jet pumps, sensor assemblies, and ship central controllers; The dual-phase jet pump is installed at the bottom of the cargo hold. The drive port of the dual-phase jet pump can be connected to the fire-fighting seawater pipeline, liquid cargo pipeline and compressed air pipeline of the cargo hold through the drive pipeline. The suction inlet of the dual-phase jet pump is connected to a sludge well located in the cargo hold via a suction pipe. The outlet of the dual-phase jet pump is connected to the overboard discharge pipeline and the liquid cargo collection pipeline respectively through the discharge pipeline; A fire-fighting seawater control valve is installed on the fire-fighting seawater pipeline; a liquid cargo drive control valve is installed on the liquid cargo pipeline; a compressed air control valve is installed on the compressed air pipeline; an overboard discharge control valve is installed on the overboard discharge pipeline; and a liquid cargo collection control valve is installed on the liquid cargo collection pipeline. The sensor assembly includes a liquid level sensor, a temperature sensor, and a combustible medium sensor; The liquid level sensor and the temperature sensor are installed inside the sewage well and electrically connected to the ship's central controller. The flammable medium sensor is located in the cargo hold and is electrically connected to the ship's central controller.

[0005] Furthermore, it also includes a filter, which is disposed inside the sewage well, and the other end of the suction pipe connected to the suction port of the two-phase jet pump is connected to the filter.

[0006] Furthermore, it also includes a check valve, which is disposed on the suction line.

[0007] Furthermore, it also includes an alarm device, which is electrically connected to the ship's central controller.

[0008] Furthermore, a drive medium control valve is provided at the drive port end of the drive pipeline away from the dual-phase jet pump. On the drive pipeline, the compressed air pipeline is connected to the drive pipeline on the side of the drive medium control valve near the drive port of the two-phase jet pump. On the drive pipeline, the fire-fighting seawater pipeline and the liquid cargo pipeline are connected to the drive pipeline on the side of the drive medium control valve away from the drive port of the two-phase jet pump.

[0009] Furthermore, the discharge pipeline is also equipped with a discharge valve.

[0010] Furthermore, the drive medium control valve, the discharge valve, and the compressed air control valve are all electrically controlled valves and are electrically connected to the ship's central controller; The fire-fighting seawater control valve, the liquid cargo drive control valve, the overboard discharge control valve, and the liquid cargo collection control valve are all manual valves.

[0011] Furthermore, the liquid cargo pipeline and the fire-fighting seawater pipeline are detachably connected to the drive pipeline; The outboard discharge pipeline and the liquid cargo collection pipeline are detachably connected to the discharge pipeline.

[0012] Compared with the prior art, the hull monitoring and treatment system for the cargo hold of a cryogenic gas carrier disclosed in this utility model has the following beneficial effects: The hull monitoring and treatment system for the cargo hold of a cryogenic gas carrier disclosed in this utility model is equipped with a dual-phase jet pump, sensor components, and a ship's central controller. The drive port of the dual-phase jet pump is connected to the fire-fighting seawater pipeline, liquid cargo pipeline, and compressed air pipeline of the cargo hold via drive pipes. The suction port is connected to a sludge well located in the cargo hold via a suction pipe. The discharge port is connected to the overboard discharge pipeline via discharge pipes. It is connected to the liquid cargo collection pipeline; thus, it can effectively realize the discharge of condensate in the cargo hold of the cryogenic gas carrier, the drainage of residual water in the system after the condensate discharge, and emergency leakage handling when liquid cargo leaks in the cargo hold of the cryogenic gas carrier. That is, the system disclosed in this application can not only effectively realize the discharge of condensate in the cargo hold, but also avoid the problem that the condensate is easy to leave moisture after discharge, which may freeze at low temperature and block or damage the system. It can also effectively handle the liquid cargo leaking in the cargo hold of the cryogenic gas carrier. The system has the advantages of compact structure and integrated functions. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the bottom monitoring and treatment system for the cargo hold space of the cryogenic gas carrier disclosed in this application; In the diagram: 1. Two-phase jet pump; 2. Sensor assembly; 3. Ship's central controller; 4. Cargo hold space; 5. Drive line; 6. Liquid cargo line; 7. Firefighting seawater line; 8. Compressed air line; 9. Suction line; 10. Sewage well; 11. Discharge line; 12. Overboard discharge line; 13. Liquid cargo collection line; 14. Liquid cargo drive control valve; 15. Firefighting seawater control valve; 16. Compressed air control valve; 17. Overboard discharge control valve; 18. Liquid cargo collection control valve; 19. Liquid level sensor; 20. Temperature sensor; 21. Combustible medium sensor; 22. Filter; 23. Check valve; 24. Drive medium control valve; 25. Discharge valve. Detailed Implementation

[0014] like Figure 1 As shown, the hull monitoring and treatment system for the cargo hold space of a cryogenic gas carrier disclosed in this application includes: 1. Two-phase jet pump; 2. Sensor assembly; and 3. Ship central controller; The dual-phase jet pump 1 is installed at the bottom of the cargo hold 4. The drive port of the dual-phase jet pump 1 can be connected to the liquid cargo pipeline 6, the fire-fighting seawater pipeline 7 and the compressed air pipeline 8 of the cargo hold 4 through the drive pipeline 5. The suction port of the dual-phase jet pump 1 is connected to the sewage well 10 located in the cargo hold space 4 via the suction pipe 9. The outlet of the dual-phase jet pump 1 is connected to the overboard discharge pipeline 12 and the liquid cargo collection pipeline 13 via the discharge pipeline 11. The dual-phase jet pump 1 is designed primarily for liquid-phase fluid operation. Its materials, structure, and performance parameters ensure that it can simultaneously meet the system's required displacement and head requirements when using both fire-fighting seawater and cryogenic liquid cargo as the driving medium. Simultaneously, this pump selection also accommodates the use of compressed air as the driving medium. In this mode, there are no special requirements for displacement and efficiency, but the pump must be able to drain residual water.

[0015] A liquid cargo drive control valve 14 is installed on the liquid cargo pipeline 6; a fire-fighting seawater control valve 15 is installed on the fire-fighting seawater pipeline 7; a compressed air control valve 16 is installed on the compressed air pipeline 8; an overboard discharge control valve 17 is installed on the overboard discharge pipeline 12; and a liquid cargo collection control valve 18 is installed on the liquid cargo collection pipeline 13. The sensor assembly 2 includes a liquid level sensor 19, a temperature sensor 20, and a combustible medium sensor 21; The liquid level sensor 19 and the temperature sensor 20 are installed inside the sewage well 10 and electrically connected to the ship's central controller 3. The combustible medium sensor 21 is installed in the cargo hold 4 and is electrically connected to the ship's central controller 3.

[0016] Specifically, the system disclosed in this application is used in the cargo hold space of cryogenic gas carriers and gas fuel-powered ships (such as LNG carriers, LPG carriers, liquid ammonia carriers or gas fuel-powered ships), specifically applied to the primary and secondary partition spaces of independent cargo holds or fuel tanks, or cargo hold / fuel tank spaces, with the aim of realizing intelligent discharge of condensate in the space, early warning of leaks and emergency safety handling. The specific working process of the hull monitoring and treatment system for the cargo hold space of the cryogenic gas carrier disclosed in this application is as follows: The ship's central controller 3 monitors the interior of the cargo hold space 4 in real time through sensor components 2 (liquid level sensor 19, temperature sensor 20, and combustible medium sensor 21). When the liquid level sensor 19 detects that the liquid level in the sewage well 10 has reached the set height threshold and the temperature sensor 20 detects that the temperature in the sewage well 10 has not dropped to the set temperature threshold, the ship's central controller 3 can automatically enter the "normal discharge mode" or give a "normal discharge mode" instruction to facilitate the operator to perform the relevant operations of "normal discharge". During "normal discharge", the liquid cargo drive control valve 14 on the liquid cargo pipeline 6 is opened, and the liquid is discharged overboard. The overboard discharge control valve 17 on pipeline 12 is opened, and the fire-fighting seawater control valve 15 on fire-fighting seawater pipeline 7 is closed; the compressed air control valve 16 on compressed air pipeline 8 is closed; and the liquid cargo collection control valve 18 on liquid cargo collection pipeline 13 is closed. Thus, the fire-fighting seawater enters the drive pipeline 5 through the liquid cargo pipeline 6 and the liquid cargo drive control valve 14, and then enters the dual-phase jet pump 1 through the drive port of the dual-phase jet pump 1. The dual-phase jet pump 1 draws condensate from the sewage well 10 through the suction pipeline 9. After the fire-fighting seawater and condensate mix in the dual-phase jet pump 1, they enter the overboard discharge pipeline 12 through the discharge pipeline 11, and the fire-fighting seawater and condensate are discharged to the outside of the ship through the overboard discharge pipeline 12, thereby realizing the "routine discharge" treatment of condensate.

[0017] After the condensate is discharged normally, the ship's central controller 3 can automatically enter the "residual water draining and antifreeze mode" or give an "extended water draining and antifreeze mode" instruction to facilitate the operator's operation of the "residual water draining and antifreeze mode". During the "residual water draining and antifreeze mode", the liquid cargo drive control valve 14 on the liquid cargo pipeline 6 is closed, the overboard discharge control valve 17 on the overboard discharge pipeline 12 is open, the fire-fighting seawater control valve 15 on the fire-fighting seawater pipeline 7 is closed; the compressed air control valve 16 on the compressed air pipeline 8 is open; and the liquid cargo collection control valve 18 on the liquid cargo collection pipeline 13 is closed, thus allowing compressed air to pass through the compressed air pipeline 8 and the compressed air control valve. Valve 16 enters the drive line 5, and then enters the dual-phase jet pump 1 through the drive port of the dual-phase jet pump 1. The dual-phase jet pump 1 draws in the residual condensate in the sewage well 10 through the suction line 9. The compressed air and residual condensate are mixed in the dual-phase jet pump 1 and then enter the overboard discharge line 12 through the discharge line 11. The compressed air and residual condensate (including residual condensate in the dual-phase jet pump 1, sewage well 10 and suction line 9, as well as fire-fighting seawater in the drive line 5, dual-phase jet pump 1 and overboard discharge line 12) are discharged to the outside of the ship through the overboard discharge line 12, thereby realizing the "residual water drainage and antifreeze" treatment.

[0018] When the level sensor 19 detects that the liquid level in the sewage well 10 has reached a set height threshold and the temperature sensor 20 detects that the temperature in the sewage well 10 has dropped to a set temperature threshold, the ship's central controller 3 can automatically enter the "emergency leak handling mode" or give an "emergency leak handling mode" instruction to facilitate the operator to perform the relevant operations of the "emergency leak handling mode". When the "emergency leak handling mode" is activated, the liquid cargo drive control valve 14 on the liquid cargo pipeline 6 is closed, the overboard discharge control valve 17 on the overboard discharge pipeline 12 is closed, the fire seawater control valve 15 on the fire seawater pipeline 7 is open; the compressed air control valve 16 on the compressed air pipeline 8 is closed; and the liquid cargo on the liquid cargo collection pipeline 13 is closed. The collection control valve 18 is opened, allowing liquid cargo (such as LNG, LPG, liquid ammonia, or other gaseous fuels) in the cargo hold 4 of the cryogenic gas carrier to enter the drive line 5 through the fire-fighting seawater line 7 and the fire-fighting seawater control valve 15. Then, it enters the dual-phase jet pump 1 through the drive port of the dual-phase jet pump 1. The dual-phase jet pump 1 draws the liquid cargo in the sewage well 10 through the suction line 9. The liquid cargo in the fire-fighting seawater line 7 and the liquid cargo drawn from the sewage well 10 are mixed in the dual-phase jet pump 1 and then enter the liquid cargo collection line 13 through the discharge line 11. The liquid cargo is then discharged by the liquid cargo collection line 13 to the cryogenic explosion-proof enclosed collection cabinet in the cargo area or into the cargo hold / fuel tank, thereby realizing the "emergency leak disposal" treatment.

[0019] The hull monitoring and treatment system for the cargo hold of a cryogenic gas carrier disclosed in this application includes a dual-phase jet pump 1, a sensor assembly 2, and a ship's central controller 3. The drive port of the dual-phase jet pump 1 is connected via a drive pipe 5 to the liquid cargo pipe 6, the fire-fighting seawater pipe 7, and the compressed air pipe 8 of the cargo hold 4. The suction port is connected via a suction pipe 9 to a sludge well 10 located in the cargo hold 4. The discharge port is connected via a discharge pipe 11 to the overboard discharge pipe 12 and the liquid cargo collection pipe 13. This system can effectively discharge condensate in the cargo hold of the cryogenic gas carrier, drain residual water from the system after condensate discharge, and handle emergency leaks when liquid cargo leaks occur in the cargo hold of the cryogenic gas carrier. In other words, the system disclosed in this application can not only effectively discharge condensate in the cargo hold but also avoid the problem of residual water after condensate discharge, which may freeze at low temperatures and block or damage the system. It can also effectively handle liquid cargo leaks in the cargo hold of the cryogenic gas carrier. The system has the advantages of compact structure and integrated functions. This system not only automatically monitors the environmental status, but also automatically identifies and prompts the crew to initiate the corresponding response procedures based on different statuses (normal, high condensation, leakage), achieving full-process safety management from perception and judgment to execution.

[0020] Furthermore, it also includes a filter 22, which is disposed inside the sewage well 10, and the other end of the suction pipe 9, which is connected to the suction port of the two-phase jet pump 1, is connected to the filter 22.

[0021] Specifically, by installing a filter 22 inside the sewage well 10, one end of the suction pipe 9 is connected to the filter 22, and the other end is connected to the suction port of the two-phase jet pump 1. By installing the filter 22 inside the sewage well 10, the medium entering the suction pipe 9 can be effectively filtered, thereby ensuring that the two-phase jet pump 1 can work effectively for a long time.

[0022] Furthermore, it also includes a check valve 23, which is installed on the suction pipe 9 to effectively prevent condensate in the suction pipe 9 from returning to the sewage well 10.

[0023] Furthermore, it also includes an alarm device, which is electrically connected to the ship's central controller 3.

[0024] Specifically, the alarm device can be an audible and visual alarm device or a text prompt, or other alarm devices. The alarm device can be integrated with the ship's central controller 3 or it can be a separate component. By setting up the alarm device, the ship's central controller 3 can issue an alarm when it detects a leak in the cargo hold space 4 through the sensor assembly 2. That is, when the alarm device detects that the concentration inside the cargo hold space 4 exceeds the safety threshold (or exceeds the safety threshold and continues to rise) through the combustible medium sensor 21, the alarm device will issue an alarm so that relevant operators can handle the situation in a timely manner.

[0025] Furthermore, a drive medium control valve 24 is provided at the drive port end of the drive pipeline 5 away from the dual-phase jet pump 1. On the drive line 5, the compressed air line 8 is connected to the drive line 5 on the side of the drive medium control valve 24 near the drive port of the two-phase jet pump 1. On the drive pipeline 5, on the side of the drive medium control valve 24 away from the drive port of the dual-phase jet pump 1, the fire-fighting seawater pipeline 7 and the liquid cargo pipeline 6 are connected to the drive pipeline 5.

[0026] Specifically, in this embodiment, one end of the drive pipeline 5 is connected to the drive port of the dual-phase jet pump 1, and the other end is sequentially connected to a compressed air pipeline 8, a fire-fighting seawater pipeline 7, and a liquid cargo pipeline 6. The compressed air pipeline 8, the fire-fighting seawater pipeline 7, and the liquid cargo pipeline 6 are arranged in parallel. A drive medium control valve 24 is provided on the drive pipeline 5 between the compressed air pipeline 8 and the fire-fighting seawater pipeline 7. The drive medium control valve 24 is an electrically controlled valve, so as to remotely start and stop the fire-fighting seawater / liquid cargo through the drive medium control valve 24 for control of conventional condensate discharge or emergency leak disposal modes.

[0027] Furthermore, the discharge pipeline 11 is also equipped with a discharge valve 25, which enables control of the discharge pipeline 11 to facilitate subsequent maintenance or replacement of the liquid cargo collection pipeline 13, the overboard discharge pipeline 12, the overboard discharge control valve 17, and the liquid cargo collection control valve 18.

[0028] Furthermore, the drive medium control valve 24, the discharge valve 25, and the compressed air control valve 16 are all electrically controlled valves and are electrically connected to the ship's central controller 3; The liquid cargo drive control valve 14, the fire-fighting seawater control valve 15, the overboard discharge control valve 17, and the liquid cargo collection control valve 18 are all manual valves.

[0029] Specifically, in this embodiment, the drive medium control valve 24, the discharge valve 25, and the compressed air control valve 16 are all electrically controlled valves and are electrically connected to the ship's central controller 3, thereby enabling the ship's central controller 3 to automatically and remotely control the drive medium control valve 24, the discharge valve 25, and the compressed air control valve 16. The liquid cargo drive control valve 14, the fire seawater control valve 15, the overboard discharge control valve 17, and the liquid cargo collection control valve 18 are all manual valves. This allows for manual confirmation by the operator before disconnecting or switching the relevant pipelines, ensuring safety. Once connected, they can be opened and operated remotely by the control valve.

[0030] Furthermore, the liquid cargo pipeline 6 and the fire-fighting seawater pipeline 7 are detachably connected to the drive pipeline 5; the overboard discharge pipeline 12 and the liquid cargo collection pipeline 13 are detachably connected to the discharge pipeline 11.

[0031] Specifically, in this embodiment, the end of the drive pipe 5 away from the drive port of the dual-phase jet pump 1 can be connected to the valve interface of the cargo drive control valve 14 (or the fire-fighting seawater control valve 15). During normal operation of the system, this end of the drive pipe 5 is connected to the valve interface of the fire-fighting seawater control valve 15. Correspondingly, one end of the discharge pipe 11 is connected to one end of the valve interface of the overboard discharge control valve 17 to facilitate routine condensate discharge. Only when the system issues an early warning requiring emergency leak handling, and after relevant operators confirm that emergency leak handling is required, the operators disconnect (unscrew) the valve interface of the drive pipe 5 from the fire-fighting seawater control valve 15 and connect the drive pipe 5 to the valve interface of the cargo drive control valve 14. Correspondingly, the operators disconnect the discharge pipe 11 from the valve interface of the overboard discharge control valve 17 and connect it to the valve interface of the cargo collection control valve 18 to carry out emergency leak handling.

[0032] In this application, the ship's central controller 3 obtains data from the sensor assembly 2 (liquid level sensor 19, temperature sensor 20, and combustible medium sensor 21) to detect the interior of the cargo hold 4 and controls the system to perform corresponding actions or provide prompts for performing corresponding actions. The specific judgment logic and control method are conventional technical means and existing technologies in this field, and will not be described in detail in this application.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A bottom monitoring and processing system for the cargo hold space of a cryogenic gas carrier, characterized in that, include: Two-phase jet pumps, sensor assemblies, and ship central controllers; The dual-phase jet pump is installed at the bottom of the cargo hold. The drive port of the dual-phase jet pump can be connected to the fire-fighting seawater pipeline, liquid cargo pipeline and compressed air pipeline of the cargo hold through the drive pipeline. The suction inlet of the dual-phase jet pump is connected to a sludge well located in the cargo hold via a suction pipe. The outlet of the dual-phase jet pump is connected to the overboard discharge pipeline and the liquid cargo collection pipeline respectively through the discharge pipeline; A fire-fighting seawater control valve is installed on the fire-fighting seawater pipeline; a liquid cargo drive control valve is installed on the liquid cargo pipeline; a compressed air control valve is installed on the compressed air pipeline; an overboard discharge control valve is installed on the overboard discharge pipeline; and a liquid cargo collection control valve is installed on the liquid cargo collection pipeline. The sensor assembly includes a liquid level sensor, a temperature sensor, and a combustible medium sensor; The liquid level sensor and the temperature sensor are installed inside the sewage well and electrically connected to the ship's central controller. The flammable medium sensor is located in the cargo hold and is electrically connected to the ship's central controller.

2. The hull monitoring and processing system for the cargo hold space of a cryogenic gas carrier according to claim 1, characterized in that: It also includes a filter, which is disposed inside the sewage well, and the other end of the suction pipe connected to the suction port of the two-phase jet pump is connected to the filter.

3. The hull monitoring and processing system for the cargo hold space of a cryogenic gas carrier according to claim 2, characterized in that: It also includes a check valve, which is disposed on the suction line.

4. The hull monitoring and processing system for the cargo hold space of a cryogenic gas carrier according to claim 3, characterized in that: It also includes an alarm device, which is electrically connected to the ship's central controller.

5. The hull monitoring and processing system for the cargo hold space of a cryogenic gas carrier according to claim 4, characterized in that: A drive medium control valve is also provided at the drive port end of the drive pipeline away from the dual-phase jet pump. On the drive pipeline, the compressed air pipeline is connected to the drive pipeline on the side of the drive medium control valve near the drive port of the two-phase jet pump. On the drive pipeline, the fire-fighting seawater pipeline and the liquid cargo pipeline are connected to the drive pipeline on the side of the drive medium control valve away from the drive port of the two-phase jet pump.

6. The hull monitoring and processing system for the cargo hold space of a cryogenic gas carrier according to claim 5, characterized in that: The discharge pipeline is also equipped with a discharge valve.

7. The hull monitoring and processing system for the cargo hold space of a cryogenic gas carrier according to claim 6, characterized in that: The drive medium control valve, the discharge valve, and the compressed air control valve are all electrically controlled valves and are electrically connected to the ship's central controller. The fire-fighting seawater control valve, the liquid cargo drive control valve, the overboard discharge control valve, and the liquid cargo collection control valve are all manual valves.

8. The hull monitoring and processing system for the cargo hold space of a cryogenic gas carrier according to claim 7, characterized in that: The liquid cargo pipeline and the fire-fighting seawater pipeline are detachably connected to the drive pipeline; The outboard discharge pipeline and the liquid cargo collection pipeline are detachably connected to the discharge pipeline.

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