Thermal stress absorption device for liquid cargo tank structure of ammonia powered duplex stainless steel chemical tanker

Abstract

The invention relates to a thermal stress absorption device for a liquid cargo tank structure suitable for an ammonia-powered duplex stainless steel chemical ship. The device is used for a ship. The ship comprises a bulkhead plate. The bulkhead plate is equipped with a heat dissipation layer, a gas cooling device and a vibration excitation device. The gas cooling device is connected to the heat dissipation layer. The vibration excitation device utilizes the principle of hammering to eliminate thermal stress and generates high-frequency, small-energy knocking motion to eliminate the thermal stress caused by the bulkhead plate under the action of a high-temperature heat source. The invention organically combines the designed pore-shaped structure heat dissipation layer, the gas cooling device and the vibration excitation device, utilizes the pore-shaped structure heat dissipation layer to block the transmission of the high-temperature heat source, and combines the gas cooling device to cool the bulkhead space that forms an abnormal temperature field, so as to avoid the phenomenon of excessive thermal stress between internal tissues of the bulkhead plate due to excessive heat input, and utilizes the vibration excitation device to eliminate the thermal stress caused by the bulkhead plate under the high-temperature heat source.

Description

Technical Field

[0001] The present invention belongs to the field of ship equipment, and more specifically, relates to a thermal stress absorption device for a liquid cargo tank structure suitable for an ammonia-powered duplex stainless steel chemical ship. Background Art

[0002] In recent years, under the combined influence of the carbon reduction strategy of the International Maritime Organization, the regional market mechanism measures represented by the European Union, and the actions of the "Zero Emission Alliance", the supply of ship fuel will be decoupled from oil reserves in the future. According to the preliminary strategy of the International Maritime Organization, from 2023, low-carbon or zero-carbon fuels (ammonia fuel, hydrogen fuel, etc.) will be used to replace fuel oil on all international shipping ships. Ammonia has a wide range of low-cost raw materials and mature production technology, and will become one of the best choices for low-carbon and energy-saving ship power. On the other hand, international chemical tanker shipping companies are expanding their fleets to meet the growing global chemical trade business. According to a latest global chemical tanker shipping market report released by Grand View Research Inc, the chemical tanker shipping market will reach US$2.5 trillion in 2025. In the future, the manufacturing and service of ammonia-powered chemical tankers contains huge market prospects.

[0003] With the development of new materials and the advancement of welding technology, duplex stainless steel chemical tankers are gradually replacing traditional chemical tankers. However, as a special ship carrying dangerous liquid cargoes, duplex stainless steel chemical tankers often transport various high-temperature cargoes, such as asphalt, creosote, sulfur and other chemicals. They usually need to be continuously heated and maintained at a high temperature (90℃-250℃) to prevent the cargo from solidifying. Naturally, the hull structure of the chemical tanker is required to sustainably withstand the thermal stress caused by the high heat source to ensure that the hull structure does not yield or crack. In duplex stainless steel chemical tankers sailing in the ocean, due to the long-term influence of high-temperature hot cargo, abnormal temperature gradients will be generated in their double hull structures, and obvious additional thermal stress will be formed in the hull cargo hold structure, forcing the local components of the hull to yield, thereby endangering the safety of the ship and the service personnel. In order to ensure the safety of duplex stainless steel chemical tankers carrying high-temperature hot cargoes during transportation, it is of great significance and value to study a new type of thermal stress absorption device. Summary of the invention

[0004] The purpose of the present invention is to provide a thermal stress absorption device for the liquid cargo tank structure of an ammonia-powered duplex stainless steel chemical ship with high energy absorption efficiency and strong safety in view of the problem that the high thermal stress area forces the internal structure of the hull to generate thermal stress. By designing a thermal stress heat dissipation layer with a pore-like structural feature that fits the hull structure, combined with a newly designed gas cooling device and an excitation device, the above problem can be solved to achieve the thermal stress absorption effect and maintain the safety of the ship in operation.

[0005] The objective of the present invention is achieved through the following technical scheme: a thermal stress absorption device for a liquid cargo tank structure of an ammonia-powered duplex stainless steel chemical ship is used for a ship, wherein the ship comprises a bulkhead plate, and the bulkhead plate is equipped with a vibration excitation device. The vibration excitation device utilizes the principle of eliminating thermal stress by hammering to generate high-frequency, low-energy knocking motion to eliminate the thermal stress caused by the bulkhead plate under the action of a high-temperature heat source.

[0006] The excitation device may be an air hammer, which includes a transmission structure, a compression cylinder, a working cylinder, a compression piston, and a valve mechanism. The motor drives the compression piston of the compression cylinder through a reduction mechanism and a crank, and the connecting rod generates compressed air, which is sent into the working cylinder through a distribution valve, pushing the piston together with the hammer head to move up and down to play a hammering role, and the hammer head forms intermittent contact with the surface of the bulkhead plate.

[0007] The vibration device may also be an impact pneumatic hammer, which utilizes the principle of aerodynamics and adjusts the impact force by adjusting the air supply pressure, so as to strike the bulkhead plate without causing deformation.

[0008] The striking force of the excitation device is less than the yield strength of the bulkhead plate. When the bulkhead plate is Q345 or Q235, the frequency is 25-50HZ and the energy is 15-25J.

[0009] Preferably, the excitation device includes N vibration devices and N power devices, N≥1; the energy output of the power device provides power for the vibration device, so that the vibration device realizes knocking motion on the surface of the bulkhead plate.

[0010] Preferably, the power device includes an air intake valve, a pressure stabilizing valve, a compressed gas pipeline, a gas compressor, a compressed gas bottle, an air jet valve, an excitation air pressure summary point, and an excitation air pressure sub-node; an air intake valve, a pressure stabilizing valve, and a gas compressor are sequentially arranged at one end of the compressed gas pipeline, and the other end of the compressed gas pipeline is connected to the compressed gas bottle, and the other end of the compressed gas bottle is provided with an air jet valve and connected to the excitation air pressure summary point, and the excitation air pressure summary point is connected to the excitation air pressure sub-node.

[0011] Preferably, a gas pipeline A and a gas pipeline B are respectively provided at both ends of the compressed gas bottle, the gas pipeline A is connected to the compressed gas pipeline, and the gas pipeline B is connected to the excitation gas pressure summary point through an injection valve.

[0012] Preferably, the excitation air pressure summary point is provided with a structurally fixed pipeline, and the excitation air pressure sub-node is arranged on the structurally fixed pipeline.

[0013] Preferably, the vibration device includes a disc vibrator, and due to the energy input of the power device, the disc vibrator realizes a knocking motion on the surface of the bulkhead plate; the disc vibrator includes an air pressure valve, a contraction body, and an impact head, and an air pressure cavity is provided inside the contraction body.

[0014] Preferably, the bulkhead plate is attached with a heat dissipation layer, and the heat dissipation layer is provided with a single piece with a pore-like structure.

[0015] Preferably, the bulkhead plate is equipped with N gas cooling devices, N≥1; the gas cooling device is connected to the heat dissipation layer, and the gas cooling device is used for cold air transportation.

[0016] Preferably, the gas cooling device includes an insulating outer shell, an air input port, N groups of air pressure bottles, N ≥ 1, a gas pipeline C, an air dividing valve, and a cooling tank; the cooling tank is located in the insulating outer shell; both ends of the cooling tank are connected to one end of the gas pipeline C through an air dividing valve respectively; the other end of the gas pipeline C is provided with an air input port and N groups of air pressure bottles; the N groups of air pressure bottles are connected to the internal channel structure of the air input port; one side of the cooling tank is connected to the heat dissipation layer through the gas pipeline C.

[0017] The thermal insulation shell is a foam thermal insulation shell, which plays a role of thermal insulation. N groups of air pressure bottles compress the air outside the ship into the gas pipeline, and the air distributor valve inputs the air into each group of cooling tanks respectively. Finally, the air at normal temperature will become low-temperature gas and then be input into the heat dissipation layer space of the air inlet hole-shaped structure through the gas pipeline, so as to continuously maintain the cold air delivery, reduce the impact of high temperature on the surface of the bulkhead plate, and prevent the impact of high temperature on other hull structures.

[0018] Preferably, the cooling tank has a double-petal structure layer inside, and a scale structure is distributed in an array on the surface of the double-petal structure layer, and the scale structure is provided with a raised structure for enhancing the conduction of cold air.

[0019] The present invention has the following beneficial effects: (1) The present invention discloses a thermal stress absorption device for a liquid cargo tank structure suitable for an ammonia-powered duplex stainless steel chemical tanker. Aiming at the strong temperature field caused by high-temperature hot cargo, a heat dissipation layer with a porous structure is designed to alleviate the high temperature from penetrating into other hull structures. At the same time, the multi-porous structure increases the contact area between the low-temperature gas and the heat dissipation layer and the continuity of heat dissipation.

[0020] (2) The present invention designs a gas cooling device with a cooling tank having a novel internal structure. The internal structure of the cooling tank can enhance the conduction of cold air to achieve efficient gas cooling function. Its low-carbon and environmentally friendly design has a certain energy-saving and emission-reduction effect.

[0021] (3) The present invention is based on the principle of eliminating stress by vibration. By designing a new type of excitation device with high-pressure gas excitation, ordinary gas is compressed into high-pressure gas and stored, and the high-pressure gas is evenly distributed to the excitation gas pressure summary point and the excitation gas pressure sub-node. The jet valve performs pulse excitation to make the disc vibrator strike with high frequency and small energy to eliminate the thermal stress caused by the high-temperature heat source on the bulkhead plate, thereby eliminating the thermal stress problem caused by the high-temperature heat source.

[0022] (4) The present invention organically combines the designed air-hole structure heat dissipation layer, the gas cooling device and the vibration excitation device in the hull side structure, utilizes the air-hole structure heat dissipation layer to block the transmission of high-temperature heat source, and combines with the gas cooling device to cool down the bulkhead space with abnormal temperature field, so as to avoid excessive thermal stress between the internal tissues of the bulkhead plate due to excessive heat input. Finally, the vibration excitation device is used to effectively and fundamentally eliminate the thermal stress caused by the high-temperature heat source on the bulkhead plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional schematic diagram of the installation position of the device of the present invention;

[0024] Figure 2 It is a three-dimensional schematic diagram of the structural arrangement of each bulkhead plate of the present invention;

[0025] Figure 3 A three-dimensional schematic diagram of the opening positions of each structural plate of the device of the present invention;

[0026] Figure 4 It is a schematic diagram of the overall arrangement of the device of the present invention;

[0027] Figure 5 It is a schematic diagram of the top view structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the heat dissipation layer with a pore-like structure according to the present invention;

[0029] Figure 7 It is a cross-sectional schematic diagram of the gas cooling device of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the gas cooling device of the present invention;

[0031] Fig. 9 This is a schematic diagram of the perspective structure of the novel cooling tank of the present invention;

[0032] Fig.10 This is a schematic diagram of the double-petal structure layer inside the new cooling tank of the present invention;

[0033] Fig.11A single three-dimensional schematic diagram of the double-petal structure layer inside the novel cooling tank of the present invention;

[0034] Fig.12 It is a top cross-sectional schematic diagram of the vibration excitation device of the present invention;

[0035] Fig.13 It is a cross-sectional schematic diagram of the vibration excitation device of the present invention;

[0036] Fig.14 It is a schematic diagram of the contact arrangement of the cabin wall surface of the vibration excitation device of the present invention;

[0037] Fig.15 It is a schematic diagram of the side view structure of the disc vibrator in the vibration excitation device of the present invention;

[0038] Fig.16 It is a schematic diagram of a half-section structure of a disc-type vibrator in the vibration excitation device of the present invention;

[0039] Fig.17 It is a top view of a half-section structure of a disc vibrator in the vibration excitation device of the present invention.

[0040] In the figure: 1 pipeline bolt, 2 heat dissipation layer, 3 insulation shell, 4 air pressure bottle, 5 air inlet, 6 air hole structure single piece, 7 groove bulkhead, 8 side transverse bulkhead, 9 gas cooling device, 10 excitation device, 11 cooling tank, 12-1 gas pipeline A, 12-2 gas pipeline B, 12-3 gas pipeline C, 13 gas distribution valve, 14 double-petal structure layer, 15 scale structure, 16 tilting structure, 17 air suction valve, 18 pressure stabilizing valve, 19 compressed gas pipeline, 20 gas compressor, 21 compressed gas bottle, 22 jet valve, 23 excitation air pressure summary point, 24 excitation air pressure sub-node, 25 bulkhead plate, 26 structure fixing pipeline, 27 high pressure gas, 28 disc vibrator, 29 air pressure cavity, 30 air pressure valve, 31-1 contraction body, 31-2 impact head. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Example 1

[0043] The thermal stress absorption device for the liquid cargo tank structure of an ammonia-powered duplex stainless steel chemical ship is used for ships. The thermal stress absorption device is arranged on the bulkhead plate 25 of the ship, such as Figure 4 , 12As shown in 13, 14, 15, 16 and 17, a vibration excitation device 10 is provided in the side tank bulkhead 8. The vibration excitation device 10 utilizes the principle of eliminating thermal stress by hammering to generate high-frequency and small-energy striking motion to eliminate the thermal stress caused by the bulkhead plate under the action of high-temperature heat source.

[0044] The excitation device 10 includes 4 vibration devices and 20 power devices. The energy output of the power device provides power for the vibration device, and the vibration device realizes a knocking motion on the surface of the bulkhead plate. The 4 power devices are vertically spaced and distributed in the side slot bulkhead 8. The vibration device includes a disc vibrator 28. Due to the energy input of the power device, the impact head 31-2 of the disc vibrator 28 realizes a knocking motion on the surface of the slot bulkhead 7.

[0045] The power device includes an air intake valve 17, a pressure stabilizing valve 18, a compressed gas pipeline 19, a gas compressor 20, a compressed gas bottle 21, an air jet valve 22, an excitation air pressure summary point 23, an excitation air pressure sub-node 24, and a structure fixing pipeline 26;

[0046] There are three compressed gas cylinders 21, and two ends of the compressed gas cylinders 21 are respectively provided with a gas pipeline A 12-1 and a gas pipeline B 12-2. The gas pipeline A 12-1 is connected to one end of the compressed gas pipeline 19, and the other end of the compressed gas pipeline 19 is sequentially provided with an air intake valve 17, a pressure stabilizing valve 18, and a gas compressor 20; the gas pipeline B 12-2 is connected to an excitation air pressure summary point 23 through an air jet valve 22; the excitation air pressure summary point 23 is connected to a structure fixed pipeline 26, and two excitation air pressure sub-nodes 24 are respectively provided on both sides of the structure fixed pipeline 26, and are symmetrically arranged with respect to the excitation air pressure summary point 23, wherein the connection method adopts an airtight connection;

[0047] The excitation air pressure sub-node 24 and the excitation air pressure summary node 23 are both fixedly connected to the disc vibrator 28 by airtight bolts. The disc vibrator 28 includes an air pressure valve 30, a contraction body 31-1, and an impact head 31-2. An air pressure cavity 29 is provided inside the contraction body 31-1. The air pressure cavity 29 can carry a certain amount of high-pressure gas 27. When the power device outputs energy, the impact head 31-2 forms intermittent contact with the grooved bulkhead 7 with high frequency and small energy.

[0048] Example 2

[0049] The thermal stress absorption device of the liquid cargo tank structure suitable for ammonia-powered duplex stainless steel chemical ships is used in ships. The thermal stress absorption device is arranged on the bulkhead plate 25 of the ship, and a vibration device 10 is provided in the side tank bulkhead 8. The vibration device 10 utilizes the principle of eliminating thermal stress by hammering to generate high-frequency small-energy knocking motion to eliminate the thermal stress caused by the bulkhead plate under the action of a high-temperature heat source.

[0050] The excitation device 10 includes 4 vibration devices and 20 power devices. The energy output of the power device provides power for the vibration device, and the vibration device realizes a knocking motion on the surface of the bulkhead plate. The 4 power devices are vertically spaced and distributed in the side slot bulkhead 8. The vibration device includes a disc vibrator 28. Due to the energy input of the power device, the impact head 31-2 of the disc vibrator 28 realizes a knocking motion on the surface of the slot bulkhead 7.

[0051] The power device includes an air intake valve 17, a pressure stabilizing valve 18, a compressed gas pipeline 19, a gas compressor 20, a compressed gas bottle 21, an air jet valve 22, an excitation air pressure summary point 23, an excitation air pressure sub-node 24, and a structure fixing pipeline 26;

[0052] There are three compressed gas cylinders 21, and two ends of the compressed gas cylinders 21 are respectively provided with a gas pipeline A 12-1 and a gas pipeline B 12-2. The gas pipeline A 12-1 is connected to one end of the compressed gas pipeline 19, and the other end of the compressed gas pipeline 19 is sequentially provided with an air intake valve 17, a pressure stabilizing valve 18, and a gas compressor 20; the gas pipeline B 12-2 is connected to an excitation air pressure summary point 23 through an air jet valve 22; the excitation air pressure summary point 23 is connected to a structure fixed pipeline 26, and two excitation air pressure sub-nodes 24 are respectively provided on both sides of the structure fixed pipeline 26, and are symmetrically arranged with respect to the excitation air pressure summary point 23, wherein the connection method adopts an airtight connection;

[0053] The excitation air pressure sub-node 24 and the excitation air pressure summary node 23 are both fixedly connected to the disc vibrator 28 by airtight bolts. The disc vibrator 28 includes an air pressure valve 30, a contraction body 31-1, and an impact head 31-2. An air pressure cavity 29 is provided inside the contraction body 31-1. The air pressure cavity 29 can carry a certain amount of high-pressure gas 27. When the power device outputs energy, the impact head 31-2 forms intermittent contact with the grooved bulkhead 7 with high frequency and small energy.

[0054] like Figure 1 , 2 As shown in Figures 3, 5 and 6, a heat dissipation layer 2 is attached to the surface of the grooved bulkhead 7. The heat dissipation layer is provided with a porous structure single piece 6. Aiming at the strong temperature field caused by high-temperature hot cargo, the heat dissipation layer 2 with a multi-porous structure is designed to alleviate the high temperature from penetrating into other hull structures and avoid thermal stress generated by the grooved bulkhead 7 under the action of high-temperature heat source.

[0055] Example 3

[0056] The thermal stress absorption device of the liquid cargo tank structure suitable for ammonia-powered duplex stainless steel chemical ships is used in ships. The thermal stress absorption device is arranged on the bulkhead plate 25 of the ship, and a vibration device 10 is provided in the side tank bulkhead 8. The vibration device 10 utilizes the principle of eliminating thermal stress by hammering to generate high-frequency small-energy knocking motion to eliminate the thermal stress caused by the bulkhead plate under the action of a high-temperature heat source.

[0057] The excitation device 10 includes 4 vibration devices and 20 power devices. The energy output of the power device provides power for the vibration device, and the vibration device realizes a knocking motion on the surface of the bulkhead plate. The 4 power devices are vertically spaced and distributed in the side slot bulkhead 8 and are located between the two gas cooling devices 9. The vibration device includes a disc vibrator 28. Due to the energy input of the power device, the impact head 31-2 of the disc vibrator 28 realizes a knocking motion on the surface of the slot bulkhead 7.

[0058] The power device includes an air intake valve 17, a pressure stabilizing valve 18, a compressed gas pipeline 19, a gas compressor 20, a compressed gas bottle 21, an air jet valve 22, an excitation air pressure summary point 23, an excitation air pressure sub-node 24, and a structure fixing pipeline 26;

[0059] There are three compressed gas cylinders 21, and two ends of the compressed gas cylinders 21 are respectively provided with a gas pipeline A 12-1 and a gas pipeline B 12-2. The gas pipeline A 12-1 is connected to one end of the compressed gas pipeline 19, and the other end of the compressed gas pipeline 19 is sequentially provided with an air intake valve 17, a pressure stabilizing valve 18, and a gas compressor 20; the gas pipeline B 12-2 is connected to an excitation air pressure summary point 23 through an air jet valve 22; the excitation air pressure summary point 23 is connected to a structure fixed pipeline 26, and two excitation air pressure sub-nodes 24 are respectively provided on both sides of the structure fixed pipeline 26, and are symmetrically arranged with respect to the excitation air pressure summary point 23, wherein the connection method adopts an airtight connection;

[0060] The excitation air pressure sub-node 24 and the excitation air pressure summary node 23 are both fixedly connected to the disc vibrator 28 by airtight bolts. The disc vibrator 28 includes an air pressure valve 30, a contraction body 31-1, and an impact head 31-2. An air pressure cavity 29 is provided inside the contraction body 31-1. The air pressure cavity 29 can carry a certain amount of high-pressure gas 27. When the power device outputs energy, the impact head 31-2 forms intermittent contact with the grooved bulkhead 7 with high frequency and small energy.

[0061] like Figure 1 , 2 As shown in Figures 3, 5 and 6, a heat dissipation layer 2 is attached to the surface of the grooved bulkhead 7. The heat dissipation layer is provided with a porous structure single piece 6. Aiming at the strong temperature field caused by high-temperature hot cargo, the heat dissipation layer 2 with a multi-porous structure is designed to alleviate the high temperature from penetrating into other hull structures and avoid thermal stress generated by the grooved bulkhead 7 under the action of high-temperature heat source.

[0062] like Figure 7 , 8As shown in Figures 9, 10 and 11, two gas cooling devices 9 are arranged in the horizontal direction in the side tank bulkhead 8, and the gas cooling device 9 includes a heat-insulating shell 3, an air inlet 5, N groups of air pressure bottles 4, N ≥ 1, a gas pipeline C12-3, a gas separation valve 13, and a cooling tank 11; the heat-insulating shell 3 is a foam heat-insulating shell, and there are two cooling tanks 11 and they are located in the heat-insulating shell 3, and the two ends of the cooling tank 11 are respectively connected to one end of the gas pipeline C12-3 through the gas separation valve 13; the other end of the gas pipeline C12-3 is provided with an air inlet 5 and N groups of air pressure bottles 4 and is located outside the side tank bulkhead 8; at the same time, a pipeline bolt 1 is also arranged at the other end of the gas pipeline C12-3, and the N groups of air pressure bottles 4 are welded and connected to the internal channel structure of the air inlet 5; one side of the gas cooling device 9 is connected to the heat dissipation layer 2 through the gas pipeline C12-3. In addition, the rest of the space inside the gas cooling device 9 is kept in vacuum.

[0063] Furthermore, the cooling tank 11 has a double-petal structure layer 14 inside, and a scale structure 15 is distributed in an array on the surface of the double-petal structure layer 14. The scale structure 15 is provided with a raised structure 16 for enhancing the conduction of cold air.

[0064] The working principle is as follows: the air outside the side tank bulkhead 8 flows through the compressed gas pipeline 19 from the air intake valve 17 to the pressure-stabilizing valve 18, and the ordinary gas is compressed into high-pressure gas 27 by the gas compressor 20 and stored in the compressed gas bottle 21. When it is necessary to eliminate the thermal stress caused by the tank bulkhead 7 under the action of the high-temperature heat source, the jet valve 22 will first evenly distribute the high-pressure gas 27 to the excitation gas pressure summary point 23 and then evenly distribute it to the excitation gas pressure sub-node 24 through the structural fixed pipeline 26. When each node is filled with high-pressure gas 27, the jet valve 22 will perform pulse excitation, the air pressure valve 30 will open, and the high-pressure gas 27 in the air pressure cavity 29 will be started to perform telescopic vibration. The impact head 31-2 of the disc vibrator at the position of the tank bulkhead 7 will knock on the surface of the steel plate, causing the treated hull structure to resonate locally. Through this resonance, a certain amount of vibration energy is transmitted to the tank bulkhead 7, so as to eliminate the problem of thermal stress caused by the tank bulkhead 7 under the action of the high-temperature heat source.

[0065] The foam insulation shell will wrap the device to play a role in insulation. Several groups of air pressure bottles 4 compress the air outside the side tank bulkhead into the gas pipe C12-3 through the air inlet 5; the gas pipe C12-3 is air-tightly welded with a leak-proof pipe plug 1, and the gas pipe C12-3 is air-tightly locked by the pipe plug 1 when it is not in operation; the gas pipe C12-3 is connected to the air separation valve 13 and the cooling tank 11 by air-tight welding, and the air is respectively input into the cooling tanks 11 of each group by the air separation valve 13; the cooling tank 11 has a double-petal structure layer 14 of a new structural form inside, and the surface of the double-petal structure layer 14 has a scale structure 15, and the scale structure 15 has a warping structure 16 for strengthening the conduction of cold air. Finally, the air at normal temperature will become low-temperature gas and be input into the space of the heat dissipation layer 2 with an air inlet-shaped structure through the gas pipe C12-3 again.

[0066] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal stress absorption device for a liquid cargo tank structure of an ammonia-powered duplex stainless steel chemical tanker, for use in a ship, wherein the ship comprises a bulkhead plate (25), characterized in that: The bulkhead plate (25) is equipped with a vibration device (10). The vibration device (10) utilizes the principle of eliminating thermal stress by hammering to generate high-frequency, low-energy knocking motion to eliminate thermal stress caused by the bulkhead plate under the action of a high-temperature heat source. The vibration device (10) includes N vibration devices and N power devices, where N is greater than or equal to 1. The energy output of the power device provides power to the vibration device, so that the vibration device performs knocking motion on the surface of the bulkhead plate. The power device comprises an air intake valve (17), a pressure stabilizing valve (18), a compressed air pipeline (19), a gas compressor (20), a compressed air bottle (21), an air jet valve (22), an excitation air pressure summary point (23), and an excitation air pressure sub-node (24); An air intake valve (17), a pressure stabilizing valve (18), and a gas compressor (20) are sequentially arranged at one end of the compressed air pipeline (19); the other end of the compressed air pipeline (19) is connected to a compressed air bottle (21); the other end of the compressed air bottle (21) is provided with an air injection valve (22) and is connected to an excitation air pressure summary point (23); the excitation air pressure summary point (23) is connected to an excitation air pressure sub-node (24).

2. The thermal stress absorption device for liquid cargo tank structure suitable for ammonia-powered duplex stainless steel chemical tanker according to claim 1 is characterized in that: A gas pipeline A (12-1) and a gas pipeline B (12-2) are respectively provided at both ends of the compressed gas bottle (21); the gas pipeline A (12-1) is connected to the compressed gas pipeline (19); and the gas pipeline B (12-2) is connected to the excitation gas pressure summary point (23) via an air jet valve (22).

3. The thermal stress absorption device for liquid cargo tank structure applicable to ammonia powered duplex stainless steel chemical tanker according to claim 1 is characterized in that: The excitation air pressure summing point (23) is provided with a structural fixed pipeline (26), and the excitation air pressure branching point (24) is arranged on the structural fixed pipeline (26).

4. The thermal stress absorption device for liquid cargo tank structure applicable to ammonia powered duplex stainless steel chemical tanker according to claim 1, characterized in that: The vibration device comprises a disc vibrator (28), and due to the energy input of the power device, the disc vibrator (28) performs a knocking motion on the surface of the bulkhead plate; The disc vibrator (28) comprises an air pressure valve (30), a contraction body (31-1), and an impact head (31-2); an air pressure cavity (29) is provided inside the contraction body (31-1).

5. The thermal stress absorption device for liquid cargo tank structure applicable to ammonia powered duplex stainless steel chemical tanker according to claim 1, characterized in that: The bulkhead plate (25) is attached with a heat dissipation layer (2), and the heat dissipation layer (2) is provided with a single-piece body (6) with an air hole structure.

6. The thermal stress absorption device for liquid cargo tank structure applicable to ammonia powered duplex stainless steel chemical tanker according to claim 5 is characterized in that: The bulkhead plate (25) is equipped with N gas cooling devices (9), where N≥1; the gas cooling devices (9) are connected to the heat dissipation layer (2), and the gas cooling devices (9) are used for cold air transportation.

7. The thermal stress absorption device for liquid cargo tank structure applicable to ammonia powered duplex stainless steel chemical tanker according to claim 6 is characterized in that: The gas cooling device (9) comprises a heat-insulating shell (3), an air input port (5), N groups of air pressure bottles (4), N≥1, a gas pipeline C (12-3), a gas distribution valve (13), and a cooling tank (11); The cooling tank (11) is located in the heat-insulating outer shell (3); both ends of the cooling tank (11) are connected to one end of a gas pipeline C (12-3) via a gas dividing valve (13); an air input port (5) and N groups of air pressure bottles (4) are arranged at the other end of the gas pipeline C (12-3); the N groups of air pressure bottles (4) are connected to the internal channel structure of the air input port (5); and one side of the cooling tank (11) is connected to the heat dissipation layer (2) via the gas pipeline C (12-3).

8. The thermal stress absorption device for liquid cargo tank structure applicable to ammonia powered duplex stainless steel chemical tanker according to claim 7, characterized in that: The cooling tank (11) has a double-petal structure layer (14) inside, and a scale structure (15) is distributed in an array on the surface of the double-petal structure layer (14), and the scale structure (15) is provided with a raised structure (16) for enhancing the conduction of cold air.

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