Automatic airtight, purging and pressure relief device and method for liquid bulk cargo berth

Abstract

The invention relates to a liquid bulk cargo berth automatic airtight, purging and pressure relief device and method.The device comprises a liquid bulk cargo ship and further comprises an automatic butt joint loading and unloading arm, a pressure relief pipeline assembly, a process loading and unloading pipeline assembly and a nitrogen pipeline assembly; the liquid bulk cargo ship is connected with the automatic butt-joint loading and unloading arm, the automatic butt-joint loading and unloading arm is connected with the process loading and unloading pipeline assembly, and the process loading and unloading pipeline assembly is connected with the pressure relief pipeline assembly and the nitrogen pipeline assembly. The tail end of the pressure relief pipeline assembly is connected with a diffusion system, the process loading and unloading pipeline assembly is connected with a tank field, and the nitrogen pipeline assembly is connected with a nitrogen system. A wharf worker does not need to operate a connecting pipeline on site, the safety risk that materials are reversely connected with a nitrogen pipeline from a process loading and unloading pipeline can be avoided, and purging inerting replacement of residual liquid can be efficiently conducted.

Description

Technical Field

[0001] The present invention relates to liquid bulk cargo berth loading and unloading operations, and more particularly to an automatic airtight, purging and pressure relief device and method for liquid bulk cargo berths. Background Art

[0002] Ports are comprehensive transportation hubs and strategic resources and crucial supports for economic and social development. With the advancement of science and technology, my country's port development will inevitably shift from relying primarily on increased resource input to relying on scientific and technological progress. By improving the intelligence and wisdom of management systems, the overall soft power of ports will be enhanced, promoting improvements in port quality and efficiency, and improving service quality. Therefore, smart ports are the primary direction of port construction and development.

[0003] At present, the main functional processes of domestic liquid bulk terminals can basically realize unmanned automated quantitative control of material loading and unloading operations and intelligent and smart operation management requirements. However, the air tightness test of the loading and unloading arm connection process material pipeline before loading and unloading operations and the purging, inerting and pressure relief of residual liquid materials after the operation are completed need to be connected to the nitrogen pipeline system, which requires manual operation on-site by terminal operators.

[0004] The main consideration is that the simple direct connection between the process material piping system and the nitrogen piping system may lead to safety control risks of the process piping material backflowing into the nitrogen piping system. In order to avoid the safety risks of the process piping material backflowing into the nitrogen piping system, the process material piping system is generally connected to the nitrogen piping system in a semi-fixed manner. Therefore, most of the domestic liquid bulk cargo terminals currently require terminal operators to manually connect the process material piping system and the nitrogen piping system on site to conduct air tightness tests on the process material pipelines before loading and unloading operations and to purge and inertize the residual liquid in the materials after the operation is completed. This makes it impossible to achieve the automation, intelligence, and smart operation management requirements of the overall operation process of liquid bulk cargo berth loading and unloading operations.

[0005] Conventional liquid bulk terminal loading and unloading operations require manual on-site operations by terminal operators to perform air-tightness testing of process material pipelines before and purging and inerting of residual material liquids after the operations are completed. Automatic air-tightness testing of process material pipelines and automatic purging and inerting of residual material liquids, as well as venting and pressure relief, cannot be achieved. The simple direct connection between the process material pipeline system and the nitrogen pipeline system poses a safety control risk of reverse flow of process pipeline materials into the nitrogen pipeline system, and cannot achieve the automation, intelligence, and smart operation management requirements of the overall operation process of liquid bulk berth loading and unloading operations. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an automatic airtight, purging and pressure relief device and method for liquid bulk berths, which does not require dock workers to operate the connecting pipelines on site, can avoid the safety risk of materials flowing back from the process loading and unloading pipelines to the nitrogen pipelines, and efficiently purge and inertate the residual liquid.

[0007] The technical solution adopted by the present invention to solve its technical problems is: to construct an automatic airtight, purging, and pressure-relieving device for liquid bulk cargo berths, including a liquid bulk cargo ship, and further including an automatic docking loading and unloading arm, a pressure-relieving pipeline assembly, a process loading and unloading pipeline assembly, and a nitrogen pipeline assembly;

[0008] The liquid bulk cargo ship is connected to the automatic docking loading and unloading arm, the automatic docking loading and unloading arm is connected to the process loading and unloading pipeline assembly, and the process loading and unloading pipeline assembly is respectively connected to the pressure-relieving pipeline assembly and the nitrogen pipeline assembly;

[0009] The end of the pressure-relieving pipeline assembly is connected to the blow-off system, the process loading and unloading pipeline assembly is connected to the tank farm, and the nitrogen pipeline assembly is connected to the nitrogen system.

[0010] According to the above solution, the liquid bulk cargo ship includes a material pipeline and a pipeline interface. The material pipeline is arranged inside the liquid bulk cargo ship, and the pipeline interface is arranged at the end of the material pipeline and located at the edge of the ship.

[0011] According to the above solution, the automatic docking loading and unloading arm includes a ship end interface, a shore end material pipe interface, and a shore end circulation pipe interface; the ship end interface is connected to the pipeline interface of the liquid bulk cargo ship through a QCDC device to realize ship-shore barge connection;

[0012] Both the shore end material pipe interface and the shore end circulation pipe interface are connected to the process loading and unloading pipeline assembly;

[0013] A first liquid level sensor, a first ERC device, and a second liquid level sensor are sequentially connected in series between the ship end interface and the shore end material pipe interface, and a first control valve, a first check valve, and a second ERC device are sequentially connected in series between the ship end interface and the shore end circulation pipe interface.

[0014] According to the above solution, the process loading and unloading pipeline assembly includes a first branch, a second branch, a third branch, and a fourth branch;

[0015] The first branch includes a material pipe interface, a second control valve, a first pressure sensor, a third control valve, a second pressure sensor, a first pressure gauge, a flow sensor, a second pressure gauge, a temperature sensor, a fourth control valve, and a first emergency cut-off valve connected in series from left to right;

[0016] The second branch includes a circulation pipe interface, a fifth control valve, and a sixth control valve connected in series from left to right;

[0017] The third branch includes a third liquid level sensor and a seventh control valve connected in series from left to right;

[0018] The fourth branch includes an eighth control valve, a second check valve, a first orifice plate, a second orifice plate, a third check valve, and a ninth control valve connected in a circular series to form a loop;

[0019] The shore-end material pipe interface is connected to the material pipe interface, the first emergency cut-off valve is connected to the tank farm, the shore-end circulation pipe interface is connected to the circulation pipe interface, the first pressure sensor is connected to the eighth control valve, the ninth control valve is connected to the third control valve, the fifth control valve is respectively connected to the sixth control valve and the third liquid level sensor, and both the sixth control valve and the seventh control valve are connected to the third control valve.

[0020] According to the above solution, the pressure relief pipeline assembly includes a fourth liquid level sensor, an eleventh control valve, a first manual valve, a fourth check valve, a flame arrester, and a second emergency cut-off valve connected in series from left to right. The fourth liquid level sensor is connected in series with the first pressure sensor, the eighth control valve, and the ninth control valve. The first pressure sensor, the eighth control valve, and the ninth control valve are connected in parallel. The second emergency cut-off valve is connected to the blow-off system.

[0021] According to the above solution, the nitrogen pipeline assembly includes a fifth liquid level sensor, a twelfth control valve, a fifth check valve, a second manual valve, a third pressure sensor, and a third emergency cut-off valve connected in series from left to right. The fifth liquid level sensor is connected to the first orifice plate, and the third emergency cut-off valve is connected to the nitrogen system.

[0022] The present invention also provides a method for automatically airtight, purging, and pressure relief of a liquid bulk cargo berth, including the following steps:

[0023] S1. Automatic docking: After the auxiliary work of berthing and mooring a liquid bulk cargo ship at the terminal is completed, the ship-end interface of the loading and unloading arm is connected to the liquid bulk cargo ship pipeline interface through the QCDC device to achieve ship-shore barge connection;

[0024] S2. Automatic airtightness test: Automatically and sequentially open the twelfth control valve and the ninth control valve, and determine whether there is liquid level in the third liquid level sensor. If there is no liquid level signal feedback from the third liquid level sensor, automatically close the ninth control valve. If there is a liquid level signal feedback alarm signal from the third liquid level sensor, it indicates that there is an internal leakage failure in the process loading and unloading pipeline assembly, and then repair and treatment shall be carried out and the next production operation cannot be performed. After the ninth control valve feeds back the signal of being closed in place, the second control valve automatically opens. After the second control valve feeds back the signal of being opened in place, the eighth control valve automatically opens, and starts to pressurize the automatic docking loading and unloading arm and the process loading and unloading pipeline assembly. When the first pressure sensor feeds back a signal, the eighth control valve automatically closes. After judging that the attenuation rate of the feedback pressure signal of the first pressure sensor is not greater than 1%, it is automatically determined that the airtightness test is qualified. If the pressure signal attenuation rate is greater than 1%, it proves that the liquid bulk carrier and the automatic docking loading and unloading arm are not effectively and tightly connected. After feeding back the alarm signal and making on-site connection treatment and confirmation, repeat the automatic airtightness test. After feeding back the qualified signal of the airtightness test, the eleventh control valve automatically opens for pressure relief. When the first pressure sensor feeds back the pressure relief signal with a delay, the eleventh control valve automatically closes, and the automatic airtightness test is completed;

[0025] S3. Automatic loading and unloading operation: The third control valve automatically opens, and automatic loading and unloading operation is carried out according to the loading and unloading volume determined by the predetermined loading and unloading operation plan. After the flow sensor feeds back that the loading and unloading volume has reached the predetermined planned volume, the third control valve is automatically interlocked and closed, and the automatic loading and unloading operation ends;

[0026] S4. Automatic purging and inerting: Automatically open the first control valve, the fifth control valve, the sixth control valve and the seventh control valve in sequence to form a residual liquid purging circulation pipeline. After the first control valve, the fifth control valve and the seventh control valve feed back the signal of being opened in place, the eighth control valve automatically opens to introduce nitrogen from the nitrogen pipeline assembly to purge the residual liquid in the process loading and unloading pipeline assembly in two directions: from the eighth control valve - the second control valve - the first control valve - the fifth control valve - the seventh control valve and from the eighth control valve - the sixth control valve - the seventh control valve into the pipeline of the process loading and unloading pipeline assembly behind the third control valve. When the liquid level sensor feeds back no liquid level signal, it proves that the residual liquid in the inner arm of the automatic docking loading and unloading arm and the process loading and unloading pipeline assembly in front of the second liquid level sensor has been purged clean. When the first liquid level sensor feeds back no liquid level signal, it proves that the residual liquid in the outer arm of the automatic docking loading and unloading arm has been purged clean. When the third liquid level sensor feeds back no liquid level signal, it proves that the residual liquid in the circulation pipeline in front of the seventh control valve has been purged clean. Only when the second liquid level sensor, the first liquid level sensor and the third liquid level sensor all feed back no liquid level signal and with a delay, the seventh control valve, the sixth control valve, the fifth control valve and the first control valve are automatically closed in sequence. After the eighth control valve, the sixth control valve, the fifth control valve and the first control valve feed back the signal of being closed in place, the eighth control valve and the twelfth control valve are automatically closed in sequence, and the automatic purging and inerting ends;

[0027] The second orifice plate - third check valve - ninth control valve branch is the standby branch for the first orifice plate - second check valve - eighth control valve. In the case of a feedback failure of the eighth control valve, the ninth control valve automatically operates to enable the second orifice plate - third check valve - ninth control valve branch for purging and inerting.

[0028] S5. Automatic venting and pressure relief: The eleventh control valve automatically opens for nitrogen residual pressure relief. When the first pressure sensor feeds back a pressure relief signal with a delay, the eleventh control valve automatically closes, and the automatic venting and pressure relief is completed.

[0029] S6. Automatic disconnection: The ship - end interface of the automatic docking loading and unloading arm is automatically disconnected from the liquid bulk cargo ship pipeline interface through the QCDC device, realizing the disconnection between the ship and the shore.

[0030] According to the above - mentioned solution, in step S2, the eighth control valve and the eleventh control valve are locked with each other in the automatic airtight test mode during pressurization.

[0031] According to the above - mentioned solution, in step S3, the eighth control valve and the eleventh control valve are locked with each other in the automatic loading and unloading operation mode during pressurization.

[0032] According to the above - mentioned solution, in step S5, the eighth control valve and the eleventh control valve are locked with each other in the automatic venting and pressure relief mode during pressurization.

[0033] Implementing the automatic airtight, purging, and pressure - relief device and method for a liquid bulk cargo berth of the present invention has the following beneficial effects:

[0034] 1. The nitrogen pipeline assembly of the present invention is fixedly connected to the process loading and unloading pipeline assembly, eliminating the need for dock workers to connect the pipelines on site. At the same time, a liquid level sensor and a check valve are provided to avoid the safety risk of material back - flowing from the process loading and unloading pipeline to the nitrogen pipeline during the automatic airtight test before introducing nitrogen into the process loading and unloading pipeline assembly and the purging and inerting of the residual liquid after the operation is completed.

[0035] 2. After the automatic docking loading and unloading arm and the process loading and unloading pipeline assembly achieve ship - shore barge connection when the liquid bulk cargo ship berths at the dock, a purging and inerting circulation loop is formed by conducting the automatic control valves, enabling efficient purging and inerting replacement of the residual liquid.

[0036] 3. After the purging and inerting replacement of the residual liquid, the pressure - relief pipeline assembly can automatically discharge the purging residual pressure. At the same time, the liquid level sensor - interlocked control valve can avoid discharging materials, and the check valve and the flame arrester can avoid back - gas and back - fire during pressure relief.

[0037] 4. The present invention fills the gaps in the automatic airtight test of the process material pipeline before loading and unloading operations and the automatic purging and inerting, venting and pressure relief of the residual liquid after the operation is completed, realizing the requirements of automatic, intelligent, and smart operation management for the overall operation process of liquid bulk cargo berth loading and unloading operations. Brief Description of the Drawings

[0038] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0039] Figure 1 is a schematic structural diagram of the automatic airtight, purging, and pressure relief device for a liquid bulk cargo berth of the present invention;

[0040] In the figure: 1. Liquid bulk cargo ship, 2. Loading and unloading arm, 3. Pressure relief pipeline assembly, 4. Process loading and unloading pipeline assembly, 5. Nitrogen pipeline assembly, 1.1. Material pipeline, 1.2. Pipeline interface, 2.1. Ship end interface, 2.2. First liquid level sensor, 2.3. First ERC device, 2.4. Second liquid level sensor, 2.5. Shore end material pipe interface, 2.6. First control valve, 2.7. First check valve, 2.8. Second ERC device, 2.9. Shore end circulation pipe interface, 2.10. QCDC device, 3.1. Fourth liquid level sensor, 3.2. Eleventh control valve, 3.3. First manual valve, 3.4. Fourth check valve, 3.5. Flame arrester, 3.6. Second emergency cut-off valve, 4.1. Material pipe interface, 4.2. Second control valve, 4.3. First pressure sensor, 4.4. Third control valve, 4.5. Second pressure sensor, 4.6. First pressure gauge, 4.7. Flow sensor, 4.8. Second pressure gauge, 4.9. Temperature sensor, 4.10. Fourth control valve, 4.11. First emergency cut-off valve, 4.12. Eighth control valve, 4.13. Ninth control valve, 4.14. Second check valve, 4.15. Third check valve, 4.16. First orifice plate, 4.17. Second orifice plate, 4.18. Sixth control valve, 4.19. Seventh control valve, 4.20. Circulation pipe interface, 4.21. Fifth control valve, 4.22. Third liquid level sensor, 5.1. Fifth liquid level sensor, 5.2. Twelfth control valve, 5.3. Fifth check valve, 5.4. Second manual valve, 5.5. Third pressure sensor, 5.6. Third emergency cut-off valve. Detailed Description of the Preferred Embodiments

[0041] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0042] As Figure 1As shown in the figure, the automatic airtight, purging, and pressure relief device for liquid bulk cargo berths of the present invention includes a liquid bulk cargo ship 1, and also includes an automatic docking loading and unloading arm 2, a pressure relief pipeline assembly 3, a process loading and unloading pipeline assembly 4, and a nitrogen pipeline assembly 5. The liquid bulk cargo ship 1 is connected to the automatic docking loading and unloading arm 2, the automatic docking loading and unloading arm 2 is connected to the process loading and unloading pipeline assembly 4, and the process loading and unloading pipeline assembly 4 is respectively connected to the pressure relief pipeline assembly 3 and the nitrogen pipeline assembly 5; the end of the pressure relief pipeline assembly 3 is connected to the venting system, the process loading and unloading pipeline assembly 4 is connected to the tank farm, and the nitrogen pipeline assembly 5 is connected to the nitrogen system.

[0043] In a preferred embodiment of the present invention, the liquid bulk cargo ship 1 includes a material pipeline 1.1 and a pipeline interface 1.2. The material pipeline 1.1 is arranged inside the liquid bulk cargo ship 1, and the pipeline interface 1.2 is arranged at the end of the material pipeline 1.1 and is located at the ship's edge.

[0044] In a preferred embodiment of the present invention, the automatic docking loading and unloading arm 2 includes a ship-end interface 2.1, a shore-end material pipe interface 2.5, and a shore-end circulation pipe interface 2.9; the ship-end interface 2.1 is connected to the pipeline interface 1.2 of the liquid bulk cargo ship 1 through a QCDC device 2.10 to achieve ship-shore barge connection; both the shore-end material pipe interface 2.5 and the shore-end circulation pipe interface 2.9 are connected to the process loading and unloading pipeline assembly 4; a first liquid level sensor 2.2, a first ERC device 2.3, and a second liquid level sensor 2.4 are successively connected in series between the ship-end interface 2.1 and the shore-end material pipe interface 2.5, and a first control valve 2.6, a first check valve 2.7, and a second ERC device 2.8 are successively connected in series between the ship-end interface 2.1 and the shore-end circulation pipe interface 2.9.

[0045] In a preferred embodiment of the present invention, the process loading and unloading pipeline assembly 4 includes a first branch, a second branch, a third branch, and a fourth branch; the first branch includes a material pipe interface 4.1, a second control valve 4.2, a first pressure sensor 4.3, a third control valve 4.4, a second pressure sensor 4.5, a first pressure gauge 4.6, a flow sensor 4.7, a second pressure gauge 4.8, a temperature sensor 4.9, a fourth control valve 4.10, and a first emergency cut-off valve 4.11 connected in series from left to right; the second branch includes a circulation pipe interface 4.20, a fifth control valve 4.21, and a sixth control valve 4.18 connected in series from left to right; the third branch includes a third liquid level sensor 4.22 and a seventh control valve 4.19 connected in series from left to right; the fourth branch includes an eighth control valve 4.12, a second check valve 4.14, a first orifice plate 4.16, a second orifice plate 4.17, a third check valve 4.15, and a ninth control valve 4.13 connected in a ring to form a loop; the shore-end material pipe interface 2.5 is connected to the material pipe interface 4.1, the first emergency cut-off valve 4.11 is connected to the tank farm, the shore-end circulation pipe interface 2.9 is connected to the circulation pipe interface 4.20, the first pressure sensor 4.3 is connected to the eighth control valve 4.12, the ninth control valve 4.13 is connected to the third control valve 4.4, the fifth control valve 4.21 is respectively connected to the sixth control valve 4.18 and the third liquid level sensor 4.22, and both the sixth control valve 4.18 and the seventh control valve 4.19 are connected to the third control valve 4.4.

[0046] In a preferred embodiment of the present invention, the pressure relief pipeline assembly 3 includes a fourth liquid level sensor 3.1, an eleventh control valve 3.2, a first manual valve 3.3, a fourth check valve 3.4, a flame arrester 3.5, and a second emergency cut-off valve 3.6 connected in series from left to right. The fourth liquid level sensor 3.1 is connected in series with the first pressure sensor 4.3, the eighth control valve 4.12, and the ninth control valve 4.13. The first pressure sensor 4.3, the eighth control valve 4.12, and the ninth control valve 4.13 are connected in parallel. The second emergency cut-off valve 3.6 is connected to the venting system.

[0047] In a preferred embodiment of the present invention, the nitrogen pipeline assembly 5 includes a fifth liquid level sensor 5.1, a twelfth control valve 5.2, a fifth check valve 5.3, a second manual valve 5.4, a third pressure sensor 5.5, and a third emergency cut-off valve 5.6 connected in series from left to right. The fifth liquid level sensor 5.1 is connected to the first orifice plate 4.16, and the third emergency cut-off valve 5.6 is connected to the nitrogen system.

[0048] The present invention also provides a method for automatically airtight, purging, and pressure relief of a liquid bulk berth according to claim 1, comprising the following steps:

[0049] S1. Automatic docking: After the mooring and cable-assisting work of the liquid bulk cargo ship 1 is completed at the dock, the ship-end interface 2.1 of the automatic docking loading and unloading arm 2 is connected to the pipeline interface 1.2 of the liquid bulk cargo ship 1 through the QCDC device to achieve ship-shore barge connection;

[0050] S2. Automatic airtightness test: In step S1, after the automatic docking feedbacks the completion signal, the automatic docking loading and unloading arm 2 is ready. The twelfth control valve 5.2 and the ninth control valve 4.13 are automatically opened in sequence. It is judged whether there is liquid level by the third liquid level sensor 4.22. If there is no liquid level signal feedback from the third liquid level sensor 4.22, the ninth control valve 4.13 is automatically closed. If there is a liquid level signal feedback from the third liquid level sensor 4.22 and an alarm signal appears, it indicates that there is an internal leakage failure in the process loading and unloading pipeline assembly 4, and then maintenance treatment is carried out and the next production operation cannot be performed. After the ninth control valve 4.13 feedbacks the closed-in-place signal, the second control valve 4.2 is automatically opened. After the second control valve 4.2 feedbacks the open-in-place signal, the eighth control valve 4.12 is automatically opened, and the automatic docking loading and unloading arm 2 and the process loading and unloading pipeline assembly 4 start to be pressurized. When the first pressure sensor 4.3 feedbacks a 0.3MPaG signal, the eighth control valve 4.12 is automatically closed. After 3 minutes, it is judged that the pressure signal decay rate feedback by the first pressure sensor 4.3 is not greater than 1%, and the airtightness test is automatically determined to be qualified. If the pressure signal decay rate is greater than 1%, it proves that the liquid bulk cargo ship 1 and the automatic docking loading and unloading arm 2 are not effectively hermetically connected. An alarm signal is feedback and on-site connection treatment is carried out. After confirmation, the automatic airtightness test is repeated. After the airtightness test qualified signal is feedback, the eleventh control valve 3.2 is automatically opened for pressure relief. When the first pressure sensor 4.3 feedbacks that the pressure is relieved to the 7kPaG signal and is delayed for 10 seconds, the eleventh control valve 3.2 is automatically closed, and the automatic airtightness test is completed;

[0051] To avoid misoperation, the eighth control valve 4.12 and the eleventh control valve 3.2 are locked with each other in the automatic airtightness test mode.

[0052] S3. Automatic loading and unloading operation: The third control valve 4.4 is automatically opened, and automatic loading and unloading operations are carried out according to the loading and unloading volume determined by the predetermined loading and unloading operation plan. After the flow sensor 4.7 feedbacks that the loading and unloading volume has reached the predetermined planned volume, the third control valve 4.4 is automatically interlocked and closed, and the automatic loading and unloading operation ends;

[0053] To avoid misoperation, the eighth control valve 4.12 and the eleventh control valve 3.2 are locked with each other in the automatic loading and unloading operation mode.

[0054] S4. Automatic purging and inerting: The first control valve 2.6, the fifth control valve 4.21, the sixth control valve 4.18, and the seventh control valve 4.19 are automatically opened in sequence to form a residual liquid purging circulation pipeline. After the first control valve 2.6, the fifth control valve 4.21, and the seventh control valve 4.19 feedback the signal of being fully opened, the eighth control valve 4.12 is automatically opened to introduce nitrogen from the nitrogen pipeline assembly 5 to purge the residual liquid in the process loading and unloading pipeline assembly 4 in two directions, namely from the eighth control valve 4.12 - the second control valve 4.2 - the first control valve 2.6 - the fifth control valve 4.21 - 4.19 and from the eighth control valve 4.12 - the sixth control valve 4.18 - the seventh control valve 4.19, into the pipeline of the process loading and unloading pipeline assembly 4 behind the third control valve 4.4. When the liquid level sensor 2.4 feedbacks a signal of no liquid level, it proves that the residual liquid in the inner arm of the automatic docking loading and unloading arm 2 and the process loading and unloading pipeline assembly 4 in front of the second liquid level sensor 4.4 has been purged clean. When the first liquid level sensor 2.2 feedbacks a signal of no liquid level, it proves that the residual liquid in the outer arm of the automatic docking loading and unloading arm 2 has been purged clean. When the third liquid level sensor 4.22 feedbacks a signal of no liquid level, it proves that the residual liquid in the circulation pipeline in front of the seventh control valve 4.19 has been purged clean. Only when the second liquid level sensor 2.4, the first liquid level sensor 2.2, and the third liquid level sensor 4.22 all feedback signals of no liquid level and with a 10 - second delay, the seventh control valve 4.19, the sixth control valve 4.18, the fifth control valve 4.21, and the first control valve 2.6 are automatically closed in sequence. After the eighth control valve 4.12, the sixth control valve 4.18, the fifth control valve 4.21, and the first control valve 2.6 feedback the signal of being fully closed, the eighth control valve 4.12 and the twelfth control valve 5.2 are automatically closed in sequence, and the automatic purging and inerting ends;

[0055] The branch of the second orifice plate 4.17 - the third check valve 4.15 - the ninth control valve 4.13 is the standby branch of the first orifice plate 4.16 - the second check valve 4.14 - the eighth control valve 4.12. In the case of the eighth control valve 4.12 feedbacking a fault, the ninth control valve 4.13 automatically acts to enable the branch of the second orifice plate 4.17 - the third check valve 4.15 - the ninth control valve 4.13 for purging and inerting;

[0056] S5. Automatic venting and pressure relief: The eleventh control valve 3.2 is automatically opened to relieve the residual nitrogen pressure. When the first pressure sensor 4.3 feedbacks a signal that the pressure has been relieved to 7 kPaG and with a 10 - second delay, the eleventh control valve 3.2 is automatically closed, and the automatic venting and pressure relief is completed;

[0057] To avoid misoperation, the charging eighth control valve 4.12 and the eleventh control valve 3.2 are mutually locked in the automatic venting and pressure relief mode.

[0058] S6. Automatic dissociation: The ship - end interface 2.1 of the automatic docking loading and unloading arm 2 is automatically dissociated from the pipeline interface 1.2 of the liquid bulk carrier 1 through the QCDC device, realizing the disconnection between the ship and the shore.

[0059] The automatic airtight, purging, and pressure relief method for liquid bulk cargo berths of the present invention can be used not only in liquid bulk cargo terminals, but also in other systems with airtight testing, purging and inerting, and venting and pressure relief, such as liquid bulk cargo tank trucks and tank container filling systems.

[0060] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. All of these are within the protection scope of the present invention.

Claims

1. An automatic airtight, purging, and pressure-relieving device for liquid bulk cargo berths, including a liquid bulk cargo ship (1), characterized in that, It also includes an automatic docking loading and unloading arm (2), a pressure relief pipeline assembly (3), a process loading and unloading pipeline assembly (4), and a nitrogen pipeline assembly (5); The liquid bulk carrier (1) is connected to the automatic docking loading and unloading arm (2), the automatic docking loading and unloading arm (2) is connected to the process loading and unloading pipeline assembly (4), and the process loading and unloading pipeline assembly (4) is respectively connected to the pressure relief pipeline assembly (3) and the nitrogen pipeline assembly (5); The end of the pressure relief pipeline assembly (3) is connected to the blow-off system, the process loading and unloading pipeline assembly (4) is connected to the tank farm, and the nitrogen pipeline assembly (5) is connected to the nitrogen system.

2. The automatic airtight, purging, and pressure-relieving device for liquid bulk berths according to claim 1, wherein, The liquid bulk carrier (1) includes a material pipeline (1.1) and a pipeline interface (1.2). The material pipeline (1.1) is arranged inside the liquid bulk carrier (1), and the pipeline interface (1.2) is arranged at the end of the material pipeline (1.1) and located at the ship's edge.

3. The automatic airtight, purging, and pressure relief device for liquid bulk berths according to claim 2, characterized in that, The automatic docking loading and unloading arm (2) includes a ship end interface (2.1), a shore end material pipe interface (2.5), and a shore end circulation pipe interface (2.9); the ship end interface (2.1) is connected to the pipeline interface (1.2) of the liquid bulk carrier (1) through a QCDC device (2.10) to realize ship-shore barge connection; Both the shore end material pipe interface (2.5) and the shore end circulation pipe interface (2.9) are connected to the process loading and unloading pipeline assembly (4); A first liquid level sensor (2.2), a first ERC device (2.3), and a second liquid level sensor (2.4) are successively connected in series between the ship end interface (2.1) and the shore end material pipe interface (2.5), and a first control valve (2.6), a first check valve (2.7), and a second ERC device (2.8) are successively connected in series between the ship end interface (2.1) and the shore end circulation pipe interface (2.9).

4. The automatic airtight, purging, and pressure relief device for liquid bulk berths according to claim 3, characterized in that, The process loading and unloading pipeline assembly (4) includes a first branch, a second branch, a third branch, and a fourth branch; The first branch includes a material pipe interface (4.1), a second control valve (4.2), a first pressure sensor (4.3), a third control valve (4.4), a second pressure sensor (4.5), a first pressure gauge (4.6), a flow sensor (4.7), a second pressure gauge (4.8), a temperature sensor (4.9), a fourth control valve (4.10), and a first emergency cut-off valve (4.11) connected in series from left to right; The second branch includes a circulation pipe interface (4.20), a fifth control valve (4.21), and a sixth control valve (4.18) connected in series from left to right; The third branch includes a third liquid level sensor (4.22) and a seventh control valve (4.19) connected in series from left to right; The fourth branch includes an eighth control valve (4.12), a second check valve (4.14), a first orifice plate (4.16), a second orifice plate (4.17), a third check valve (4.15), and a ninth control valve (4.13) connected in a ring series to form a loop; The shore-side material pipe interface (2.5) is connected to the material pipe interface (4.1), the first emergency cut-off valve (4.11) is connected to the tank farm, the shore-side circulation pipe interface (2.9) is connected to the circulation pipe interface (4.20), the first pressure sensor (4.3) is connected to the eighth control valve (4.12), the ninth control valve (4.13) is connected to the third control valve (4.4), the fifth control valve (4.21) is respectively connected to the sixth control valve (4.18) and the third liquid level sensor (4.22), and both the sixth control valve (4.18) and the seventh control valve (4.19) are connected to the third control valve (4.4).

5. The automatic airtight, purging and pressure-relieving device for liquid bulk berths according to claim 4, characterized in that, The pressure relief pipeline assembly (3) includes a fourth liquid level sensor (3.1), an eleventh control valve (3.2), a first manual valve (3.3), a fourth check valve (3.4), a flame arrester (3.5) and a second emergency cut-off valve (3.6) connected in series from left to right. The fourth liquid level sensor (3.1) is connected in series with the first pressure sensor (4.3), the eighth control valve (4.12) and the ninth control valve (4.13). The first pressure sensor (4.3), the eighth control valve (4.12) and the ninth control valve (4.13) are connected in parallel. The second emergency cut-off valve (3.6) is connected to the blow-off system.

6. The automatic airtight, purging, and pressure relief device for liquid bulk berths according to claim 5, characterized in that, The nitrogen pipeline assembly (5) includes a fifth liquid level sensor (5.1), a twelfth control valve (5.2), a fifth check valve (5.3), a second manual valve (5.4), a third pressure sensor (5.5) and a third emergency cut-off valve (5.6) connected in series from left to right. The fifth liquid level sensor (5.1) is connected to the first orifice plate (4.16). The third emergency cut-off valve (5.6) is connected to the nitrogen system.

7. An automatic airtight, purging, and pressure relief method for a liquid bulk cargo berth, which uses the automatic airtight, purging, and pressure relief device for a liquid bulk cargo berth described in claim 1, and is characterized in that, The method includes the following steps: S1. Automatic docking: After the auxiliary work of berthing and mooring the liquid bulk carrier (1) at the terminal is completed, the ship-end interface (2.1) of the automatic docking loading and unloading arm (2) is connected to the pipeline interface (1.2) of the liquid bulk carrier (1) through the QCDC device to achieve ship-shore barge connection. S2. Automatic airtight test: Automatically and sequentially open the twelfth control valve (5.2) and the ninth control valve (4.13), and determine whether there is liquid level in the third liquid level sensor (4.22). If there is no liquid level signal feedback from the third liquid level sensor (4.22), automatically close the ninth control valve (4.13). If there is a liquid level signal feedback from the third liquid level sensor (4.22) and an alarm signal is generated, it indicates that there is an internal leakage failure in the process loading and unloading pipeline assembly (4), then repair it and do not proceed with the next production operation. After the ninth control valve (4.13) feeds back the signal of being closed in place, the second control valve (4.2) automatically opens. After the second control valve (4.2) feeds back the signal of being opened in place, the eighth control valve (4.12) automatically opens, and starts to pressurize the automatic docking loading and unloading arm (2) and the process loading and unloading pipeline assembly (4). When the first pressure sensor (4.3) feeds back a signal, the eighth control valve (4.12) automatically closes. After judging that the attenuation rate of the pressure signal fed back by the first pressure sensor (4.3) is not greater than 1%, it is automatically determined that the airtight test is qualified. If the attenuation rate of the pressure signal is greater than 1%, it proves that the liquid bulk carrier (1) and the automatic docking loading and unloading arm (2) are not effectively and tightly connected. After feeding back an alarm signal and performing on-site connection processing and confirmation, repeat the automatic airtight test. After feeding back the qualified signal of the airtight test, the eleventh control valve (3.2) automatically opens for pressure relief. When the first pressure sensor (4.3) feeds back a pressure relief signal with a delay, the eleventh control valve (3.2) automatically closes, and the automatic airtight test is completed; S3. Automatic loading and unloading operation: The third control valve (4.4) automatically opens, and automatic loading and unloading operations are carried out according to the loading and unloading volume determined by the predetermined loading and unloading operation plan. After the flow sensor (4.7) feeds back that the loading and unloading volume has reached the predetermined planned volume, the third control valve (4.4) is automatically interlocked and closed, and the automatic loading and unloading operation ends; S4. Automatic purging and inerting: The first control valve (2.6), the fifth control valve (4.21), the sixth control valve (4.18), and the seventh control valve (4.19) are automatically opened in sequence to form a residual liquid purging circulation pipeline. After the first control valve (2.6), the fifth control valve (4.21), and the seventh control valve (4.19) feedback the signal of being fully opened, the eighth control valve (4.12) is automatically opened to introduce nitrogen from the nitrogen pipeline assembly (5) to purge the residual liquid in the process loading and unloading pipeline assembly (4) in two directions: from the eighth control valve (4.12) - the second control valve (4.2) - the first control valve (2.6) - the fifth control valve (4.21) - the seventh control valve (4.19) and from the eighth control valve (4.12) - the sixth control valve (4.18) - the seventh control valve (4.19) into the pipeline of the process loading and unloading pipeline assembly (4) behind the third control valve (4.4). When the liquid level sensor (2.4) feedbacks a signal of no liquid level, it proves that the residual liquid in the inner arm of the automatic docking loading and unloading arm (2) and the process loading and unloading pipeline assembly (4) in front of the second liquid level sensor (4.4) has been purged clean. When the first liquid level sensor (2.2) feedbacks a signal of no liquid level, it proves that the residual liquid in the outer arm of the automatic docking loading and unloading arm (2) has been purged clean. When the third liquid level sensor (4.22) feedbacks a signal of no liquid level, it proves that the residual liquid in the circulation pipeline in front of the seventh control valve (4.19) has been purged clean. Only when the second liquid level sensor (2.4), the first liquid level sensor (2.2), and the third liquid level sensor (4.22) all feedback signals of no liquid level and with a delay, the seventh control valve (4.19), the sixth control valve (4.18), the fifth control valve (4.21), and the first control valve (2.6) are automatically closed in sequence. After the eighth control valve (4.12), the sixth control valve (4.18), the fifth control valve (4.21), and the first control valve (2.6) feedback the signal of being fully closed, the eighth control valve (4.12) and the twelfth control valve (5.2) are automatically closed in sequence, and the automatic purging and inerting ends; The branch of the second orifice plate (4.17) - the third check valve (4.15) - the ninth control valve (4.13) is the standby branch of the first orifice plate (4.16) - the second check valve (4.14) - the eighth control valve (4.12). In the case where the eighth control valve (4.12) feedbacks a fault, the ninth control valve (4.13) automatically operates to enable the branch of the second orifice plate (4.17) - the third check valve (4.15) - the ninth control valve (4.13) for purging and inerting; S5. Automatic venting and pressure relief: The eleventh control valve (3.2) is automatically opened to relieve the residual nitrogen pressure. When the first pressure sensor (4.3) feedbacks a signal of pressure relief with a delay, the eleventh control valve (3.2) is automatically closed, and the automatic venting and pressure relief is completed; S6. Automatic dissociation: The ship - end interface (2.1) of the automatic docking loading and unloading arm (2) is automatically dissociated from the pipeline interface (1.2) of the liquid bulk carrier (1) through the QCDC device, realizing the disconnection between the ship and the shore.

8. The automatic airtight, purging, and pressure relief method for a liquid bulk berth according to claim 7, characterized in that, In the step S2, the eighth control valve (4.12) and the eleventh control valve (3.2) are locked with each other in the automatic airtight test mode.

9. The automatic airtight, purging, and pressure relief method for liquid bulk berths according to claim 7, characterized in that In the step S3, the eighth pressure charging control valve (4.12) and the eleventh control valve (3.2) are locked with each other in the automatic loading and unloading operation mode.

10. The automatic airtight, purging, and pressure relief method for a liquid bulk cargo berth according to claim 7, characterized in that, In the step S5, the eighth pressure charging control valve (4.12) and the eleventh control valve (3.2) are locked with each other in the automatic emptying and discharging mode.

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