Ocean thermal energy conversion system with phase change heat exchanger

Abstract

The application discloses a marine temperature difference energy power generation system with a phase change heat exchanger, which comprises a shell, a power generation device and a phase change heat exchanger arranged in the shell, the phase change heat exchanger comprises a rubber capsule arranged in the heat exchanger shell, phase change material is filled between the rubber capsule and the heat exchanger shell, an outer threaded sleeve rod parallel to a central shaft of the heat exchanger is arranged in the heat exchanger shell, and N annular ribs are coaxially fixed in the heat exchanger shell; the power generation device comprises a generator, an oil capsule, an oil outlet pipeline and an oil return pipeline, the oil outlet pipeline is connected to an oil outlet of the oil capsule through a connecting pipeline from an oil outlet of the rubber capsule, sequentially passes through a first one-way valve, an accumulator, a flow controller and a turbine, and is connected to the oil outlet of the oil capsule, the turbine is connected with the generator, the oil return pipeline is connected to the oil outlet of the rubber capsule through a connecting pipeline from the oil outlet of the oil capsule, sequentially passes through an electromagnetic valve and a second one-way valve, and is connected to the oil outlet of the rubber capsule. The application has the advantages of simple manufacturing method, low cost, low maintenance cost in later period, improved heat exchange performance, temperature difference energy power generation and high power generation.

Description

TECHNICAL FIELD

[0001] The present application can relate to the field of ocean thermal energy conversion and utilization, and is mainly applied to the design and manufacture of underwater unmanned vehicle thermal energy power systems, the research and development of small thermal energy devices, and the like. BACKGROUND

[0002] The ocean thermal energy power generation system can convert ocean thermal energy into electrical energy, and is an important power system for underwater unmanned vehicles. Compared with conventional underwater unmanned vehicles driven by batteries, underwater unmanned vehicles equipped with ocean thermal energy power generation systems have the advantages of long service life, strong endurance, wide working range, and sustainable energy source. Therefore, the ocean thermal energy power generation system used as a power device for underwater unmanned vehicles has been widely researched and focused on at home and abroad in recent years.

[0003] The main working principle of the ocean thermal energy power generation system is to convert ocean thermal energy into hydraulic oil pressure energy by means of the volume change of the solid-liquid phase change material during phase change, and then to convert the pressure energy into electrical energy by means of a turbine power generation system. In the system, the phase change heat exchanger is filled with phase change material and hydraulic oil. When the underwater unmanned vehicle works on the sea surface, the phase change heat exchanger absorbs the thermal energy of the high-temperature surface seawater, the solid phase change material melts and expands in volume, squeezing the hydraulic oil in the rubber oil bag, increasing the hydraulic oil pressure energy and kinetic energy, and the high-pressure hydraulic oil drives the turbine to drive the generator, finally converting the thermal energy into electrical energy; when the underwater unmanned vehicle works in the deep sea with lower temperature, the phase change heat exchanger releases heat, the liquid phase change material solidifies and shrinks in volume, forming a low pressure, and the hydraulic oil flows back, and the system returns to the initial state. Once the underwater unmanned vehicle shuttles between the ocean surface and the deep sea, the phase change material can complete a phase change cycle, and finally realize the "on-demand" energy collection.

[0004] In the thermal energy underwater unmanned vehicle, the phase change heat exchanger is directly in contact with seawater, and is the main device for converting thermal energy into hydraulic energy. The performance of the phase change heat exchanger directly determines the energy conversion efficiency and energy recovery power of the power system. In order to reduce the phase change time of the phase change material and improve the power generation power of the system, many researchers propose to install annular ribs in the phase change heat exchanger. In actual production and use, the phase change heat exchanger with ribs has two problems to be solved: first, the main installation method of the annular ribs is integrated casting or post-welding, but integrated casting has high processing difficulty and high cost; welding may cause damage to the original phase change heat exchanger shell, reduce the pressure-bearing capacity of the heat exchanger, and the underwater unmanned vehicle may face the risk of deformation and even complete destruction under pressure. Second, the position of the manufactured phase change heat exchanger ribs cannot be adjusted, and the strengthening effect of the ribs on heat exchange cannot achieve the optimal effect when the external environment changes. SUMMARY

[0005] In view of the above prior art, in order to solve the manufacturing problem of the phase change heat exchanger with the ring-shaped fins, and make up for the defect that the fin position cannot be adjusted, the application discloses a marine temperature difference energy power generation system suitable for underwater unmanned carrier, and is equipped with a new type of phase change heat exchanger, which adopts a ring fin mounting method, compared with an integrated casting method and a welding method, does not damage the original structure and overall strength of the heat exchanger wall surface, and has the advantages of simple operation, low cost, low maintenance cost in later period; the threaded rod in the heat exchanger can realize the axial displacement of the heat exchange fins, optimize the reinforced heat exchange effect of the fins, and further improve the heat exchange performance of the heat exchanger.

[0006] In order to solve the above technical problems, the application provides a marine temperature difference energy power generation system equipped with a phase change heat exchanger, which comprises a shell, the shell is divided into upper and lower parts by a horizontal position partition plate, the upper part is a power generation device, and the lower part is a phase change heat exchanger; the phase change heat exchanger comprises a rubber capsule arranged in the heat exchanger shell; an oil port is arranged at the top of the rubber capsule; the rubber capsule contains hydraulic oil; a phase change material is filled between the rubber capsule and the heat exchanger shell; a threaded rod component parallel to the center axis of the heat exchanger is arranged in the heat exchanger shell; the threaded rod component comprises an outer threaded sleeve rod; an upper fixed shaft and a lower fixed shaft are respectively nested at the upper end and the lower end of the outer threaded sleeve rod; a first spring is arranged between the upper fixed shaft and the outer threaded sleeve rod; a second spring is arranged between the lower fixed shaft and the outer threaded sleeve rod; a through hole for fixing the upper fixed shaft is arranged on the partition plate; the upper fixed shaft is provided with a center hole; a nested hole for fixing the lower fixed shaft is arranged at the bottom end of the heat exchanger shell; a threaded rod adjuster connected with the outer threaded sleeve rod is arranged on the partition plate; N ring-shaped fins coaxial with the center axis of the heat exchanger are fixed on the outer threaded sleeve rod by thread connection; the outer edges of the N ring-shaped fins are in contact with the inner surface of the heat exchanger shell; the arc diameters of the inner edges of the N ring-shaped fins decrease from top to bottom; the inner edges of the N ring-shaped fins belong to the same circular truncated cone side; a plurality of flow guide holes are arranged on the N ring-shaped fins; the power generation device comprises a generator, an oil capsule, an oil outlet pipeline and an oil return pipeline arranged in the power generation device shell; the oil outlet pipeline is connected to the oil port of the oil capsule through a connecting pipeline, and sequentially passes through a first one-way valve, an accumulator, a flow controller and a turbine after the oil port of the rubber capsule; the turbine is connected with the generator; the oil return pipeline is connected to the oil port of the rubber capsule through a connecting pipeline, and sequentially passes through an electromagnetic valve and a second one-way valve after the oil port of the oil capsule.

[0007] Further, the marine temperature difference energy power generation system equipped with a phase change heat exchanger disclosed by the application has the following advantages:

[0008] The threaded rod adjuster comprises an electric motor, a differential, a rope winding device and a traction rope, the electric motor drives the differential and the rope winding device in sequence, one end of the traction rope is fixed on the rope winding device, the other end of the traction rope is fixed with the outer threaded sleeve rod after passing through the center hole, and the differential is provided with a fixer.

[0009] The connecting pipeline is a stainless steel high-pressure oil pipeline.

[0010] The pressure set value of the accumulator is 20 MPa.

[0011] The top and bottom of the shell are both hemispherical shell spaces, and the space between the top and bottom is a cylindrical space.

[0012] The rubber capsule is coaxial with the central shaft of the heat exchanger.

[0013] The N annular fins are arranged at equal intervals.

[0014] The determination of the number N of the annular fins, the fin height, the fin slope, the fin thickness, the fin interval A, the diameter d and the number n of the flow guide holes is as follows: the number N of the fins is calculated according to the maximum allowable additional mass of the buoy fin; the fin height refers to the radial dimension of the annular fin from the inner wall of the heat exchanger to the inner edge of the fin; the height of the annular fin located at the bottom of the phase change heat exchanger is H max =0.9*L, and the height of the annular fin located at the top of the phase change heat exchanger is H min =(0.4~0.8)*H max , wherein L is the difference between the inner wall of the heat exchanger shell and the radius of the rubber capsule; the fin slope is (H max -H min) :((N-1)*A); the fin thickness is 1-5 mm; the number n of the flow guide holes is 6-10, and the diameter d of the flow guide hole is 10-20 mm.

[0015] The phase change material is selected from materials with a phase change temperature in the range of 4-30 DEG C and a phase change volume change rate greater than 8%. Preferably, it is n-hexadecane or n-pentadecane.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] (1) The marine temperature difference energy power generation system disclosed in the present application is equipped with a novel phase change heat exchanger, and the heat exchanger manufacturing method has innovation, which does not damage the original structure of the phase change heat exchanger shell and does not affect the mechanical strength of the phase change heat exchanger shell compared with the existing fin welding method; compared with the existing integrated casting method, the annular fin mounting method disclosed in the present application is simple in process, low in manufacturing cost and convenient in later maintenance.

[0018] (2) The installation method of the application can fix the threaded rod through the nesting hole, and then fix the phase change fin through the threaded rod, so that the fixing effect of the fin is good, and the horizontal movement, up and down movement and rotation of the fin in the heat exchanger can be effectively prevented.

[0019] (3) The threaded hole in the phase change heat exchanger fin of the application is beneficial to the convection of the phase change material. Compared with welding or integrated design, the convection can shorten the melting and solidification time of the phase change material in the heat exchanger by 9%, and the power generation of the temperature difference power generation system is higher.

[0020] (4) The fin arranged and installed by the threaded rod is convenient to disassemble, the fin is convenient to replace, and the maintenance cost is low in the later period.

[0021] (5) The threaded rod of the phase change heat exchanger of the research has the function of stretching and contracting, can appropriately adjust the fin arrangement spacing according to the working environment of the phase change heat exchanger, so that the strengthening heat exchange effect of the fin on the heat exchanger can be continuously maintained in the optimal state, and the heat exchange performance of the heat exchanger is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the structure of the marine temperature difference power generation system of the application;

[0023] Figure 2 is Figure 1 a three-dimensional structure schematic diagram of the phase change heat exchanger shown in

[0024] Figure 3 is a length adjustment principle diagram of the threaded rod in the phase change heat exchanger;

[0025] Figure 4 is a matching three-dimensional structure schematic diagram of the threaded rod and the annular fin in the phase change heat exchanger.

[0026] In the drawing:

[0027] 101-heat exchanger shell 102-phase change material 103-first ring fin

[0028] 104-second ring fin 105-third ring fin 106-fourth ring fin

[0029] 107-rubber capsule 108-flow guide hole 109-threaded rod part

[0030] 110-nesting hole 111-threaded rod adjuster 112-baffle

[0031] 113-generator housing 201-first one-way valve 202-second one-way valve

[0032] 203-solenoid valve 204-generator 205-oil capsule

[0033] 206-Turbine 207-Flow Controller 208-Accumulator

[0034] 1-Electric motor 2-Differentiation 3-Fixing device

[0035] 4-Upper fixed shaft; 5-First spring; 6-External threaded sleeve.

[0036] 7-Second spring; 8-Lower fixed shaft; 9-Thread.

[0037] 10-Traction rope 11-Rope reel 12-Center hole Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0039] This invention proposes an ocean thermal energy conversion system equipped with a phase change heat exchanger, such as... Figure 1 As shown, the system includes a shell, the top and bottom of which are hemispherical shells, with a cylindrical space between them. The shell is divided into upper and lower parts by a horizontal partition 112. The upper part is a power generation device, and the lower part is a phase change heat exchanger. The phase change heat exchanger includes a rubber bladder 107 disposed within the heat exchanger shell 101. The rubber bladder 107 is coaxial with the central axis of the heat exchanger. An oil port is provided at the top of the rubber bladder 107. The rubber bladder 107 is filled with hydraulic oil. A phase change material 102 is filled between the rubber bladder 107 and the heat exchanger shell 101. The phase change material is selected from materials with a phase change temperature in the range of 4~30℃ and a phase change volume change rate greater than 8%. In this embodiment, the phase change material is preferably n-hexadecane or n-pentadecane.

[0040] The heat exchanger housing 101 is provided with a threaded rod component 109 parallel to the central axis of the heat exchanger. For example... Figure 1 and Figure 2As shown, the threaded rod component 109 includes an outer threaded sleeve rod 6, the upper and lower ends of which are respectively nested with an upper fixed shaft 4 and a lower fixed shaft 8, a first spring 5 is arranged between the upper fixed shaft 4 and the outer threaded sleeve rod 6, a second spring 7 is arranged between the lower fixed shaft 8 and the outer threaded sleeve rod 6, the partition plate 112 is provided with a through hole for fixing the upper fixed shaft 4, the upper fixed shaft 4 is provided with a center hole 12, and the bottom end of the heat exchanger shell 101 is provided with a nested hole 110 for fixing the lower fixed shaft 8; the partition plate 112 is provided with a threaded rod adjuster 111 connected with the outer threaded sleeve rod 6. The threaded rod adjuster 111 includes an electric motor 1, a differential 2, a rope winding device 11 and a traction rope 10, the electric motor 1 drives the differential 2 and the rope winding device 11 in turn, one end of the traction rope 10 is fixed on the rope winding device 11, the other end of the traction rope 10 is fixed with the outer threaded sleeve rod 6 after passing through the center hole 12, and the differential 2 is provided with a fixer 3.

[0041] The N annular ribs coaxial with the center axis of the heat exchanger are fixed on the outer threaded sleeve rod 6 by thread connection, the outer edges of the N annular ribs are in contact with the inner surface of the heat exchanger shell 101, the diameters of the circular arcs of the inner edges of the N annular ribs decrease in turn from top to bottom, and the inner edges of the N annular ribs belong to the same side of the circular truncated cone; a plurality of flow guide holes 108 are formed in each of the N annular ribs; in this embodiment, the N annular ribs are arranged at equal intervals.

[0042] In the present application, the number N of the annular ribs, the rib height, the rib slope, the rib thickness, the rib spacing A, the diameter d and the number n of the flow guide holes are determined as follows: Figure 4 As shown, comprising:

[0043] (1) The number N of the ribs is calculated according to the maximum allowable additional mass of the buoy rib;

[0044] (2) The rib height refers to the radial dimension of the annular rib from the inner wall of the heat exchanger to the inner edge of the rib;

[0045] (3) The height of the annular rib located at the bottom of the phase change heat exchanger is H max =0.9*L, and the height of the annular rib located at the top of the phase change heat exchanger is H min = (0.4~0.8)*H max , wherein L is the difference between the inner wall of the heat exchanger shell 101 and the radius of the rubber capsule 107;

[0046] (4) The rib slope is (H max -H min) :((N-1)*A);

[0047] (5) the fin thickness is 1-5mm;

[0048] (6) the number n of the flow guide holes is 6-10, and the diameter d of the flow guide holes is 10-20mm.

[0049] In the application, the power generation device comprises a generator 204, an oil bag 205 and its oil outlet pipeline and oil return pipeline arranged in a power generation device shell 113, the oil outlet pipeline is connected to the oil port of the oil bag 205 through a connecting pipeline from the oil port of the rubber bag 107, sequentially passing through a first one-way valve 201, an accumulator 208, a flow controller 207 and a turbine 206, the turbine 206 is connected with the generator 204, the oil return pipeline is connected to the oil port of the rubber bag 107 through a connecting pipeline from the oil port of the oil bag 205, sequentially passing through an electromagnetic valve 203 and a second one-way valve 203. The connecting pipeline is a stainless steel high-pressure oil pipeline.

[0050] In the application, the connecting sequence of the devices on the oil outlet pipeline of the hydraulic oil is a first one-way valve 201, an accumulator 208, a flow controller 207, a turbine 206 and an oil bag 205. The hydraulic oil with a slow flow rate flows out of the rubber bag 107, flows into the accumulator 208 through the first one-way valve 201 and is concentrated, and the accumulator 208 can also maintain the hydraulic oil pressure. When the pressure in the accumulator 208 reaches a set value, the flow controller 207 is opened, the hydraulic oil flows through the flow controller 207, drives the turbine 206 to rotate, the hydraulic oil pressure after flowing out of the turbine is reduced, and finally flows into the oil bag 205 for oil return. The turbine can drive the generator 204 to generate electric energy, and the recommended pressure set value of the accumulator is 20MPa.

[0051] The connecting sequence of the devices on the oil return pipeline of the hydraulic oil is an electromagnetic valve 203 and a second one-way valve 202. When the pressure of the rubber bag 107 in the phase change heat exchanger is reduced, the electromagnetic valve 203 is opened, and the hydraulic oil in the oil bag 205 flows back to the rubber bag 107 through the electromagnetic valve 203 and the second one-way valve 202.

[0052] The marine temperature difference energy power generation system can pass through the warm water layer and the cold water layer in the ocean, and convert the temperature difference energy of seawater into electric energy. The main working process of the marine temperature difference energy power generation system is described in detail.

[0053] (1) Phase change material melting and power generation process: initial state, phase change heat exchanger phase change material 102 is solid. When the temperature difference power generation system stays on the ocean surface, the seawater temperature is high, the phase change material in the phase change heat exchanger absorbs heat, changes from solid to liquid, expands in volume, and squeezes the rubber capsule 107. The hydraulic oil in the rubber capsule 107 is pressurized and flows out of the phase change heat exchanger, flows through the first one-way valve 201 and is temporarily stored in the accumulator 207. Due to the inflow of hydraulic oil, the accumulator pressure continuously rises. When the hydraulic oil pressure in the accumulator reaches a set value, the flow controller 207 opens, the hydraulic oil flows into the turbine 206 to drive the turbine 206 to rotate, and the turbine drives the generator 204 to generate electric energy. The hydraulic oil flowing out of the turbine is temporarily stored in the oil capsule 205.

[0054] (2) Phase change material solidification and hydraulic oil return process: after the power generation process, the phase change material 102 in the phase change heat exchanger is in a liquid state. When the temperature difference power generation system hovers on the seabed, the seawater temperature is low, the phase change material 102 in the phase change heat exchanger releases heat and solidifies from liquid to solid, the volume shrinks, the rubber capsule 107 inside the phase change heat exchanger forms a negative pressure, the pressure is lower than that of the oil capsule 204, and the hydraulic oil flows back to the phase change heat exchanger through the electromagnetic valve 203 and the second one-way valve 202 in turn, and the ocean temperature difference power generation system returns to the initial state. The underwater unmanned carrier shuttles between the ocean surface and the deep sea once, and the phase change material can complete a phase change cycle and generate power using ocean temperature difference energy.

[0055] The ocean temperature difference power generation system disclosed in the present application, wherein the phase change heat exchanger is an important component, and its performance directly affects the power generation power and efficiency of the system. The phase change heat exchanger disclosed in the present application is attached with annular ribs, which can enhance the heat exchange performance of the heat exchanger. The overall structure of the phase change heat exchanger is as shown in Figure 4 The phase change heat exchanger has a novel structure and can solve the problems of high processing difficulty and damage to the mechanical strength of the traditional rib heat exchanger. The processing and manufacturing process of the phase change heat exchanger proposed in the present application will be described in detail:

[0056] (1) Threaded rod part 109, its specific structure is as shown in Figure 2The threaded rod component 109 is a multi-section structure with thick middle and thin ends. The diameter of the outer threaded sleeve 6 is recommended to be 10-14 mm, and the diameter of the upper and lower fixed shafts 4 and 8 is recommended to be 6-12 mm. The threaded rods with different diameters are matched with each other. In order to assemble and install the springs, end caps are arranged at one or both ends of the outer threaded sleeve 6, and end outer edges are arranged at the upper and lower fixed shafts 5 and 8. Taking the upper fixed shaft 4 and the first spring 5 as an example, the upper fixed shaft 5 is installed into the outer threaded sleeve 6, the first spring 5 is arranged in the annular space between the upper fixed shaft 5 and the outer threaded sleeve 6, and then the end cap at the upper end of the outer threaded sleeve 6 is fixed. The up and down movement of the outer threaded sleeve 6 can be realized through the threaded rod adjuster 111 and the spring action between the threaded rod adjuster 111 and the upper and lower fixed shafts at both ends of the outer threaded sleeve 6. The principle diagram of the length adjustment of the outer threaded sleeve 6 is shown in Figure 2 The upper fixed shaft 4 and the lower fixed shaft 8 are fixed in the through hole of the upper partition plate 112 of the phase change heat exchanger and the nested hole 110 at the bottom of the heat exchanger shell 101 respectively. The electric motor 1 drives the differential mechanism 2, the rope winding device 9 and the traction rope 10 in sequence, so as to realize the up and down movement of the outer threaded sleeve 6. Meanwhile, the first spring 5 and the second spring 7 with the extension function are arranged between the upper fixed shaft 4 and the lower fixed shaft 8 and the second threaded rod respectively, so as to realize the rebound of the outer threaded sleeve 6. The total length of the threaded rod component 109 depends on the height of the designed phase change heat exchanger shell 101.

[0057] (2) Annular rib. The thickness of the annular rib has little effect on heat exchange. When the thickness of the rib is designed, only the strength requirement of the rib needs to be met. When the annular rib is processed, the outermost edge in contact with the heat exchanger shell 101 should be provided with a chamfer as much as possible, and the thickness of the chamfer is recommended to be 0.5 mm or 1 mm. The flow guide hole 108 provided on the annular rib can be a threaded hole. One of the threaded holes is matched with the outer threaded sleeve 6, and the remaining threaded holes have a flow guide effect, which can enhance the convection intensity in the heat exchanger and strengthen the heat exchange performance. As shown in Figure 3 In this embodiment, four annular ribs are designed, which are the first annular rib 103, the second annular rib 104, the third annular rib 105 and the fourth annular rib 106 from bottom to top. The four annular ribs are fixed on the outer threaded sleeve 6 of the threaded rod component 109 through threaded connection. The materials of all the annular ribs and the threaded rod component 109 can be selected as the same metal material as the heat exchanger shell 101, or a material with larger temperature conductivity coefficient can be selected, and the corrosion problem when different materials are in contact should be considered.

[0058] (3) Phase change heat exchanger shell 101 and rubber capsule 107. According to the design requirements and design criteria of the phase change heat exchanger, the phase change heat exchanger is designed, and the overall shell with hemispherical ends and cylindrical middle is processed. The partition plate 112 is processed and fixed, and the nested hole 110 at the bottom of the shell is processed. The rubber capsule 107 of corresponding size is processed.

[0059] (4) Assembly. According to the manufacturing requirements of the phase change heat exchanger, all the fins of the phase change heat exchanger are installed on the threaded rod part 109, and the fixed shafts at the upper and lower ends of the threaded rod part are inserted into the corresponding positioning holes of the partition plate 112 and the bottom of the shell respectively. Then put in the rubber capsule 107, fill the phase change material 102, and finally encapsulate the phase change heat exchanger. The three-dimensional structure diagram of the assembled phase change heat exchanger is shown in Figure 4 .

[0060] In the present application, the up and down displacement of the annular fin should be adjusted according to the change of the environmental temperature of the phase change heat exchanger, so as to ensure that the strengthening heat exchange effect of the fin on the phase change heat exchanger always maintains the optimal effect. The adjustment strategy of the position of the annular fin is described as follows:

[0061] (1) When in winter or in a sea area with high latitude, the temperature of the surface seawater is low, and the temperature difference between the surface seawater and the deep seawater is small. This condition is not conducive to the heat exchange enhancement of the phase change heat exchanger, and the natural convection heat transfer process in the phase change heat exchanger is weak, resulting in slow phase change speed of the top phase change material and fast phase change speed of the bottom phase change material. At this time, the electric motor 1 should be started to pull the annular fin to move upward.

[0062] (2) When in summer or in a sea area with low latitude, the temperature of the surface seawater is high, and the temperature difference between the surface seawater and the deep seawater is large. This condition is conducive to the heat exchange enhancement of the phase change heat exchanger, and the natural convection effect in the phase change heat exchanger is greater, resulting in faster phase change speed of the top phase change material and slower phase change speed of the bottom phase change material. At this time, the fixed device 3 should be closed, the outer threaded sleeve rod 6 is displaced downward under the action of the first spring 5 and the second spring 7, and the annular fin is driven to move downward until the heat exchange effect of the phase change heat exchanger reaches the optimal value.

[0063] Although the present application has been described in conjunction with the accompanying drawings, the present application is not limited to the specific embodiments described above, which are merely illustrative and not restrictive. Those skilled in the art can make many modifications under the inspiration of the present application without departing from the spirit of the present application. For example, the specific adjustment parameters of the fin position depend on the corresponding phase change heat exchanger strengthening technology optimization research, and according to the length adjustment principle of the threaded rod in the present application, a multi-section outer threaded sleeve rod can be used to more flexibly adjust the position and spacing of the annular fin. These are all within the protection scope of the present application.

Claims

1. A marine thermal power generation system equipped with a phase change heat exchanger, comprising a housing, characterized by, The shell is divided into upper and lower parts by a horizontal partition plate (112), the upper part is a power generation device, and the lower part is a phase change heat exchanger, the phase change heat exchanger comprises a rubber capsule (107) arranged in a heat exchanger shell (101), an oil port is arranged at the top of the rubber capsule (107), the rubber capsule (107) contains hydraulic oil, a phase change material (102) is filled between the rubber capsule (107) and the heat exchanger shell (101), and the heat exchanger shell (101) is provided with a threaded rod component (109) parallel to the center axis of the heat exchanger; The threaded rod component (109) comprises an outer threaded sleeve rod (6), upper and lower ends of the outer threaded sleeve rod (6) are respectively nested with an upper fixed shaft (4) and a lower fixed shaft (8), a first spring (5) is arranged between the upper fixed shaft (4) and the outer threaded sleeve rod (6), a second spring (7) is arranged between the lower fixed shaft (8) and the outer threaded sleeve rod (6), the partition plate (112) is provided with a through hole for fixing the upper fixed shaft (4), the upper fixed shaft (4) is provided with a center hole (12), and the bottom end of the heat exchanger shell (101) is provided with a nested hole (110) for fixing the lower fixed shaft (8); the partition plate (112) is provided with a threaded rod adjuster (111) connected with the outer threaded sleeve rod (6); N annular ribs coaxial with the center axis of the heat exchanger are fixed on the outer threaded sleeve rod (6) and are spaced apart through threaded connection, outer edges of the N annular ribs are in contact with the inner surface of the heat exchanger shell (101), the diameters of circular arcs of inner edges of the N annular ribs decrease from top to bottom, and the inner edges of the N annular ribs belong to the same side of a circular truncated cone; a plurality of flow guide holes (108) are formed in the N annular ribs; The power generation device comprises a generator (204), an oil capsule (205) and oil outlet pipelines and oil return pipelines thereof, the oil outlet pipelines are connected to the oil port of the oil capsule (205) through a connecting pipeline and sequentially pass through a first one-way valve (201), an accumulator (208), a flow controller (207) and a turbine (206) from the oil port of the rubber capsule (107), the turbine (206) is connected with the generator (204), and the oil return pipelines are connected to the oil port of the rubber capsule (107) through a connecting pipeline and sequentially pass through an electromagnetic valve (203) and a second one-way valve (203) from the oil port of the oil capsule (205).

2. The ocean thermal energy conversion system according to claim 1, wherein The threaded rod adjuster (111) comprises an electric motor (1), a differential (2), a rope winding device (11) and a traction rope (10), the electric motor (1) drives the differential (2) and the rope winding device (11) in sequence, one end of the traction rope (10) is fixed on the rope winding device (11), the other end of the traction rope (10) is fixed on the outer threaded sleeve rod (6) after penetrating through the center hole (12), and the differential (2) is provided with a fixer (3).

3. The ocean thermal energy conversion system with a phase change heat exchanger according to claim 1, wherein The connecting pipeline is a stainless steel high-pressure oil pipe.

4. The ocean thermal energy conversion system with a phase change heat exchanger according to claim 1, wherein The pressure setting value of the accumulator (208) is 20 MPa.

5. The ocean thermal energy conversion system with a phase change heat exchanger according to claim 1, wherein The top and bottom of the shell are both hemispherical shell spaces, and the space between the top and bottom is a cylindrical space.

6. The ocean thermal energy conversion system with a phase change heat exchanger according to claim 1, wherein The rubber capsule (107) is coaxial with the central shaft of the heat exchanger.

7. The ocean thermal energy conversion system with a phase change heat exchanger according to claim 1, wherein The N annular fins are arranged at equal intervals.

8. The ocean thermal energy conversion system with a phase change heat exchanger according to claim 7, wherein The determination of the number N of the annular fins, the fin height, the fin slope, the fin thickness, the fin interval A, the diameter d and the number n of the flow guide holes: The number N of the fins is calculated according to the maximum allowable additional mass of the buoy fin; The fin height refers to the radial dimension of the annular fin from the inner wall of the heat exchanger to the inner edge of the fin; The height of the annular fin at the bottom of the phase change heat exchanger is H max =0.9*L, the height of the annular fin at the top of the phase change heat exchanger is H min =(0.4~0.8)*H max Wherein, L is the difference between the inner wall of the heat exchanger shell (101) and the radius of the rubber capsule (107); The rib inclination is (H max -H min) :((N-1)*A) The fin thickness is 1-5 mm; The number n of the flow guide holes is 6-10, and the diameter d of the flow guide hole is 10-20 mm.

9. The ocean thermal energy conversion system with a phase change heat exchanger according to claim 1, characterized in that, The phase change material is selected from a material with a phase change temperature in the interval of 4-30 DEG C and a phase change volume change rate greater than 8%.

10. The ocean thermal energy conversion system with a phase change heat exchanger according to claim 9, wherein The phase change material is n-hexadecane or n-pentadecane.

Images