High-safety low-noise external cooling device suitable for deep sea submersible vehicle

Abstract

The invention relates to a high-safety low-noise external cooling device suitable for a deep-sea submersible vehicle, and relates to the field of underwater ultra-large-depth deep-sea operation technical equipment, the high-safety low-noise external cooling device comprises a steam turbine, and a waste steam output end of the steam turbine is provided with a heat exchange assembly; an external seawater shell assembly is arranged on the side, away from the steam turbine, of the heat exchange assembly, and the heat exchange assembly conducts temperature exchange on dead steam of the steam turbine and a medium of the external seawater shell assembly. The deep-sea working platform has the effect of improving the safety of the deep-sea working platform while reducing the operation noise of the system.

Description

Technical Field

[0001] The present application relates to the field of underwater ultra-deep deep-sea operation technical equipment, and in particular to a high-safety, low-noise external cooling device suitable for deep-sea submersibles. Background Art

[0002] Deep-sea operation platforms based on the Rankine cycle generally use steam turbine generator sets to provide power for platform propulsion and deep-sea operations. The exhaust steam generated after the steam enters the steam turbine generator set and works enters the condenser at the bottom. The steam turbine condenser generally uses a shell and tube heat exchanger, and the final heat sink is seawater. The seawater flows on the tube side, and the exhaust steam flows on the shell side.

[0003] In normal operation, a large flow of seawater is pumped into the condenser through a high-power circulating water pump to condense the exhaust steam after steam processing into unsaturated water. However, the circulating water pump has a large power and will generate a large mechanical noise during operation.

[0004] For deep-sea platforms, when the operating depth is large, the seawater system in the hull seaport, seawater pipelines, equipment flow components, etc. will be subject to high seawater pressure. In order to ensure the integrity of the platform pressure boundary, especially the integrity of the heat transfer pipe in the condenser, high requirements are put forward for the design of the deep-sea platform seaport, pipelines, and equipment flow components. In terms of material selection, titanium alloy materials with high pressure bearing capacity are generally required, which are expensive; in terms of system design, in order to adapt to the external high pressure, the material thickness of the seaport, pipeline, and equipment flow components needs to be continuously increased, which increases the weight of the sea access system and the difficulty of layout in the deep-sea operating platform.

[0005] With respect to the above-mentioned related technologies, the inventors believe that for deep-sea operating platforms at extremely large depths, traditional sea access systems need to withstand relatively high seawater pressure. In order to ensure the integrity of the sea access system, higher requirements are placed on the sea access port, system pipelines, equipment flow-through components, etc. The noise level is high, the cost is high, and the overall demand for the platform is large. Summary of the invention

[0006] In order to improve the safety of deep-sea operating platforms while reducing system operating noise, the present application provides a high-safety, low-noise external cooling device suitable for deep-sea submersibles.

[0007] The present application provides a high-safety, low-noise external cooling device suitable for deep-sea submersibles, which adopts the following technical solution:

[0008] A high-safety, low-noise external cooling device suitable for a deep-sea submersible comprises a steam turbine, wherein a heat exchange component is arranged at the exhaust steam output end of the steam turbine, an external seawater shell component is arranged on the side of the heat exchange component facing away from the steam turbine, and the heat exchange component performs temperature exchange between the exhaust steam of the steam turbine and the medium of the external seawater shell component.

[0009] Optionally, the heat exchange component includes a condenser, which is connected to the exhaust steam output end of the turbine, and an intermediate phase change circuit is arranged inside the condenser, one end of the intermediate phase change circuit is located inside the condenser, and the other end of the intermediate phase change circuit is located inside the external seawater shell component.

[0010] Optionally, one end of the condenser is connected to a steam generator, and the steam generator is connected to the condenser through a water supply circuit.

[0011] Optionally, a non-condensable gas discharge pipe is fixedly connected to the top wall of the condenser, and the non-condensable gas discharge pipe is communicated with the interior of the condenser.

[0012] Optionally, the intermediate phase change circuit includes a phase change pipeline, to which a pump body is fixedly connected, and the pump body drives the medium inside the phase change pipeline to flow inside the phase change pipeline. The phase change pipeline is provided with a hot end at one end of the condenser, and the phase change pipeline is provided with a cold end at one end of the external seawater shell assembly.

[0013] Optionally, the phase change pipeline adopts a titanium alloy tube, and the phase change circuit working fluid inside the phase change pipeline adopts ammonia.

[0014] Optionally, the pump body adopts a capillary pump.

[0015] Optionally, the external seawater shell assembly includes a pressure-resistant shell, a side wall of the pressure-resistant shell is provided with a water inlet and a water outlet, one end of the heat exchange assembly extends into the interior of the pressure-resistant shell, and the water inlet and the water outlet are both connected to the interior of the pressure-resistant shell.

[0016] Optionally, the water inlet is located at the head end of the water outlet close to the traveling direction.

[0017] Optionally, a pump body is fixedly connected to one side of the interior of the pressure-resistant shell close to the water inlet, and the pump body drives liquid from the outside to enter the interior of the water inlet.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] 1. Compared with the traditional solution of direct flow of seawater through the condenser, the solution proposed in this application can effectively reduce the direct pressure-bearing components and improve the safety of the cooling system; and replace the circulating water pump with a capillary pump or compressor to reduce the noise level. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a high-safety, low-noise external cooling device suitable for deep-sea submersibles in an embodiment of the present application.

[0021] Explanation of the reference numerals: 1. Steam turbine; 2. Heat exchange assembly; 21. Condenser; 22. Intermediate phase change circuit; 221. Phase change pipeline; 222. First pump body; 23. Non-condensable gas discharge pipe; 24. Water supply circuit; 3. External seawater shell assembly; 31. Pressure shell; 32. Water inlet; 33. Water outlet; 4. Steam generator. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0024] The following is combined with Figure 1 This application is described in further detail.

[0025] The present application discloses a high-safety, low-noise external cooling device suitable for deep-sea submersibles. Figure 1 A high-safety, low-noise external cooling device suitable for deep-sea submersibles includes a steam turbine 1. High-temperature and high-pressure steam enters the steam turbine 1 to perform work, and becomes exhaust steam after the work is completed. The exhaust steam is discharged from the exhaust steam output end of the steam turbine 1. A heat exchange component 2 is provided at the exhaust steam output end of the steam turbine 1, and an external seawater shell component 3 is provided on the other side of the heat exchange component 2. The heat exchange component 2 performs heat exchange between the inside of the external seawater shell component 3 and the medium at the exhaust steam output end of the steam turbine 1, thereby cooling the high-temperature gas at the exhaust steam output end of the steam turbine 1. A steam generator 4 is provided on one side of the heat exchange component 2.

[0026] The heat exchange assembly 2 includes a condenser 21 , the inlet end of the condenser 21 is relatively connected to the exhaust steam output end of the steam turbine 1 , so that the exhaust steam output from the steam turbine 1 can be directly input into the condenser 21 for heat exchange.

[0027] An intermediate phase change circuit 22 is also provided inside the condenser 21. The intermediate phase change circuit 22 includes a phase change pipeline 221. One end of the phase change pipeline 221 is located inside the condenser 21, and the other end of the phase change pipeline 221 extends from the side wall of the condenser 21 to the inside of the external seawater shell component 3. The phase change pipeline 221 is located at one end of the condenser 21 to form a hot end, and the phase change pipeline 221 is located at one end of the external seawater shell component 3 to form a cold end. The hot end exchanges heat with the exhaust steam output from the steam turbine inside the condenser 21, and the cold end is located inside the external seawater shell component 3 to exchange heat with the external seawater.

[0028] A first pump body 222 is fixedly connected to the phase change pipeline 221. The first pump body 222 can be a compressor or a capillary pump. Under the condition of satisfying the function and performance, the capillary pump is preferably used to reduce the noise during the operation of the system.

[0029] The medium located inside the phase change pipeline 221 is driven by the first pump body 222 to flow inside the phase change pipeline 221, so that when the medium is at the cold end, it exchanges heat with the low-temperature medium located inside the external seawater shell assembly 3, and enters the interior of the condenser 21 driven by the first pump body 222. The low-temperature phase change medium exchanges heat with the high-temperature exhaust steam at the hot end inside the condenser 21, so that the temperature of the high-temperature exhaust steam is reduced, and the temperature of the phase change medium is increased again, and driven by the first pump body 222, it flows back to the cold end to perform cyclic heat exchange.

[0030] The working fluid in the phase change loop should preferably have high latent heat and thermal conductivity. It is also necessary to consider fluid dynamics, pumping limits, height factor of the heat pipe system and gas phase viscosity. At the same time, the restrictions on medium selection on deep-sea operating platforms, such as atmospheric environmental issues, should also be considered. When the system leaks or the working fluid needs to be replenished, the ability to remove the leaked working fluid from the air, the toxic air ratio limit, flammability and explosion limits, fluid preparation requirements before filling and replenishing the system (exhaust, impurity removal, etc.), container pressure, compatibility of heat pipe materials and working fluids (corrosion, erosion, oxide formation, non-condensable gas generation, etc.), welding and sealing temperatures of joints and fluid operating temperatures, potential impacts of underwater equipment leakage, and the impact of system downtime during construction, laying, maintenance, etc.

[0031] Based on the above considerations, water is a safe and preferred fluid for common working fluids, with a lower vapor pressure, and therefore within the operating range of the phase change loop. HCFC refrigerants, such as R22, R11, R12 or R134a, are viable alternatives that work above atmospheric pressure. Considering the low saturated vapor pressure of water, the phase change loop needs to be evacuated, which is not conducive to deep-sea working conditions.

[0032] Ammonia has a lower boiling point, high latent heat of vaporization, and can reach a higher saturated vapor pressure, which is conducive to use as a phase change loop working fluid under deep-sea conditions. At the same time, ammonia is incompatible with nickel-copper alloys and will cause corrosion. After comprehensive comparison, it is recommended to use titanium alloy tubes as the phase change pipeline 221 material, and ammonia as the phase change loop working fluid.

[0033] A non-condensable gas discharge pipe 23 is fixedly connected to the top of the condenser 21 . The non-condensable gas discharge pipe 23 is relatively connected to the inside of the condenser 21 , so that the non-condensable gas inside the condenser 21 can be discharged through the inside of the non-condensable gas discharge pipe 23 .

[0034] A water supply loop 24 is fixedly connected between the condenser 21 and the steam generator 4 , one end of the water supply loop 24 is fixedly connected to the condenser 21 and relatively communicated with each other, and the other end of the water supply loop 24 is fixedly connected to the steam generator 4 and relatively communicated with each other, thereby connecting the condenser 21 and the steam generator 4 through the water supply loop 24 .

[0035] The external seawater shell assembly 3 includes a pressure shell 31, and a water inlet 32 ​​and a water outlet 33 are provided at one end of the pressure shell 31 away from the condenser 21, and the interior of the pressure shell 31 is filled with low-temperature liquid through the water inlet 32. In some embodiments, in order to facilitate the entry of low-temperature seawater from the outside into the interior of the pressure shell 31, the water inlet 32 ​​is located on the side of the water outlet 33 close to the head end of the submarine's travel direction. In other embodiments, the side wall of the pressure shell 31 is fixedly connected to a second pump body, the water inlet end of the second pump body is located on one side of the water inlet 32, and the water outlet end of the second pump body is located on the side close to the water outlet 33, so that the low-temperature medium from the outside enters the interior of the pressure shell 31 from the water inlet 32 ​​through the second pump body, and is discharged from the position of the water outlet 33 after heat exchange with the cold end of the intermediate phase change circuit 22.

[0036] In this application, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A high-safety, low-noise external cooling device suitable for deep-sea submersibles, characterized by: The invention comprises a steam turbine (1), wherein a heat exchange component (2) is arranged at the exhaust steam output end of the steam turbine (1), an external seawater shell component (3) is arranged on the side of the heat exchange component (2) facing away from the steam turbine (1), and the heat exchange component (2) performs temperature exchange between the exhaust steam of the steam turbine (1) and the medium of the external seawater shell component (3).

2. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 1, characterized in that: The heat exchange component (2) comprises a condenser (21), the condenser (21) is connected to the exhaust steam output end of the steam turbine (1), an intermediate phase change circuit (22) is arranged inside the condenser (21), one end of the intermediate phase change circuit (22) is located inside the condenser (21), and the other end of the intermediate phase change circuit (22) is located inside the external seawater shell component (3).

3. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 2 is characterized in that: One end of the condenser (21) is connected to a steam generator (4), and the steam generator (4) is in communication with the condenser (21) via a water supply circuit (24).

4. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 2, characterized in that: A non-condensable gas discharge pipe (23) is fixedly connected to the top wall of the condenser (21), and the non-condensable gas discharge pipe (23) is in communication with the interior of the condenser (21).

5. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 2, characterized in that: The intermediate phase change circuit (22) comprises a phase change pipeline (221), a pump body is fixedly connected to the phase change pipeline (221), and the pump body drives the medium inside the phase change pipeline (221) to flow inside the phase change pipeline (221); a hot end is arranged at one end of the phase change pipeline (221) located at the condenser (21), and a cold end is arranged at one end of the phase change pipeline (221) located at the external seawater shell component (3).

6. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 5, characterized in that: The phase change pipeline (221) is made of a titanium alloy tube, and the phase change circuit working fluid inside the phase change pipeline (221) is ammonia.

7. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 5, characterized in that: The pump body adopts a capillary pump.

8. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 1, characterized in that: The external seawater shell component (3) comprises a pressure-resistant shell (31), a side wall of the pressure-resistant shell (31) is provided with a water inlet (32) and a water outlet (33), one end of the heat exchange component (2) extends into the interior of the pressure-resistant shell (31), and the water inlet (32) and the water outlet (33) are both connected to the interior of the pressure-resistant shell (31).

9. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 8, characterized in that: The water inlet (32) is located at the head end of the water outlet (33) close to the direction of travel.

10. The high-safety, low-noise external cooling device suitable for deep-sea submersibles according to claim 8, characterized in that: A pump body is fixedly connected to one side of the interior of the pressure-resistant shell (31) close to the water inlet (32), and the pump body drives liquid from the outside to enter the interior of the water inlet (32).

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