LNG (Liquefied Natural Gas) cold energy power generation type heat exchange device integrated with semiconductor element

Abstract

The utility model relates to the technical field of LNG (Liquefied Natural Gas) cold energy recovery, and discloses an LNG cold energy power generation type heat exchange device integrated with a semiconductor element, which comprises an outer shell and a plurality of power generation components arranged in the outer shell, the power generation assembly comprises a heat exchange tube; a plurality of semiconductor elements are mounted on the outer surface of the heat exchange tube; a protective sleeve is mounted on the outer side of the heat exchange tube so as to cover the plurality of semiconductor elements; a plurality of expansion joints and a plurality of line concentration ports are arranged on the protective sleeve; the low-temperature LNG flows on the outer side of the protective sleeve; high-temperature fluid flows on the inner sides of the heat exchange tubes; according to the scheme, the technical prejudice that a semiconductor temperature difference device is conventionally independently used to be integrated into a circulating system to achieve temperature difference power generation is broken through, semiconductor elements are effectively integrated into the device and do not need to be matched with a complex system for control, complexity of a thermodynamic circulating system is avoided, the structure is simpler and more compact, and cost is lower. According to the system, LNG cold energy recovery and synchronous power generation are efficiently, flexibly and safely utilized, and the economical efficiency of LNG cold energy recovery is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of LNG cold energy recovery, in particular to an LNG cold energy power generation type heat exchange device with integrated semiconductor elements. Background Art

[0002] LNG, or liquefied natural gas, is a natural gas produced from a gas field that has been purified and liquefied at normal pressure through a series of ultra-low temperature processes. It is recognized as the cleanest fossil energy on earth. Generally, liquefied natural gas is liquefied by cooling to about minus 163 degrees Celsius under atmospheric pressure. In the industrial field, LNG needs to absorb heat and heat up to be converted into gaseous natural gas before it can be transported to the natural gas pipeline network and used by users. LNG needs to absorb heat during the conversion process, and the existing devices simply convert LNG into gaseous natural gas, and a large amount of LNG's cold energy is wasted in the process. Therefore, how to recycle the cold energy of LNG has become a research hotspot.

[0003] Using LNG cold energy to generate electricity is currently a common way to utilize cold energy. Patent 202120500567.0 discloses a natural gas cold energy combined power generation system. The system integrates the Rankine cycle and semiconductor temperature difference power generation, and combines the semiconductor temperature difference power generation unit to achieve more modes of power generation without changing the structure of the expansion power generation unit and the Rankine cycle power generation unit.

[0004] However, since the system integrates multiple types of power generation technologies, it brings high technical integration difficulties in actual operation. Each unit needs to be precisely controlled and coordinated to ensure efficiency and stability. Moreover, the overall complexity of the system increases, affecting the maintenance and operating costs of the system; the flow distribution of the system is not considered, which will cause each heat exchange unit to be under different heat exchange conditions, affecting the actual application effect. In addition, this complex structure and layout also increases the risk of leakage of flammable and explosive working fluids and reduces the safety of the system. Utility Model Content

[0005] The utility model aims to provide an LNG cold energy power generation type heat exchange device with integrated semiconductor elements, which is used to solve the technical problems of the existing LNG cold energy power generation type system device with complex structure, high modification cost, poor space utilization and poor maintainability.

[0006] The basic scheme provided by the utility model is: an LNG cold energy power generation type heat exchange device with integrated semiconductor elements, comprising an outer shell and a plurality of power generation components installed in the outer shell; tube sheets are installed on both sides of the outer shell; a plurality of tube holes are arranged on the tube sheets according to a first preset method; a plurality of the power generation components are installed between the tube sheets on both sides through the tube holes according to a second preset method;

[0007] The power generation assembly includes a heat exchange tube; a plurality of semiconductor elements are installed on the outer surface of the heat exchange tube according to a third preset method; a protective sleeve is installed on the outer side of the heat exchange tube to cover the plurality of semiconductor elements; the protective sleeve is provided with a plurality of expansion joints and a plurality of line collection ports;

[0008] The outer shell is provided with a low-temperature LNG supply pipe inlet and an NG outlet so that the low-temperature LNG flows outside the protective casing; the tube sheets on both sides are installed with heads on the side away from the outer shell; the heads on both sides are respectively installed with a high-temperature fluid supply pipe inlet and a high-temperature fluid supply pipe outlet so that the high-temperature fluid flows inside the heat exchange tube.

[0009] Furthermore, the two ends of the heat exchange tube are respectively installed on the tube holes on both sides, wherein the outer diameter of the heat exchange tube is matched with the diameter of the tube hole.

[0010] Furthermore, two ends of the protective sleeve are respectively installed on the tube sheets on both sides.

[0011] Furthermore, the radial and axial gaps between the protective sleeve and the heat exchange tube, and between the semiconductor elements are filled with insulating materials.

[0012] Furthermore, the relative positions of the tube holes are arranged in an equilateral triangle or a square, and the center distance between adjacent tube holes is not less than 1.25 times the outer diameter of the heat exchange tube.

[0013] Furthermore, the second preset mode is that all power generation components are arranged in parallel along the axial direction of the outer shell.

[0014] Furthermore, the third preset method is that the semiconductor elements are evenly distributed along the outer diameter and radial direction of the heat exchange tube.

[0015] Furthermore, the semiconductor element is mounted on the outer surface of the heat exchange tube by bonding.

[0016] Furthermore, a contact seat is arranged on the inner side of the protective sleeve and at a position opposite to the semiconductor element.

[0017] Furthermore, the NG outlet and the low-temperature LNG supply pipe inlet are arranged in a relatively staggered manner; and the high-temperature fluid supply pipe outlet and the high-temperature fluid supply pipe inlet are arranged in a relatively staggered manner.

[0018] The working principle and advantages of the utility model are as follows: high-temperature fluid flows in from the inlet of the high-temperature fluid supply pipe, passes through a head on one side, a tube hole on one side, a heat exchange pipe, a tube hole on the other side, a head on the other side, and flows out from the inlet of the high-temperature fluid supply pipe; low-temperature LNG flows into the outer shell from the inlet of the low-temperature LNG supply pipe, flows on the outside of several protective sleeves, and because high-temperature fluid flows in the heat exchange pipe on the inside of the protective sleeve, heat is generated, and the low-temperature LNG absorbs heat and vaporizes, and flows out from the NG outlet; at this time, the semiconductor element located between the protective sleeve and the heat exchange pipe generates electricity based on the temperature difference between the inside and the outside, and the electric energy generated by the semiconductor element is collected by arranging lines through the collection port.

[0019] Compared with the prior art, the advantage of the utility model is that it breaks through the technical prejudice of conventionally independently using semiconductor temperature difference devices to integrate into the circulation system to realize temperature difference power generation, and effectively integrates semiconductor elements into the device of this scheme, directly and synchronously realizes the cold energy recovery and power generation of LNG, does not need to be coordinated with complex systems for control, and avoids the complexity of the thermal cycle system; based on the idea of ​​synchronously realizing the cold energy recovery and power generation of LNG in this scheme, the layout of the entire device components is optimized, and the structure is simpler and more compact. Through the first preset method, the second preset method and the third preset method, the structural layout can be flexibly carried out according to actual needs, so that the entire device is more flexible, can adapt to more scenarios and system requirements, and has strong versatility; the device design level also considers the thermal stress problem that may be caused by large temperature differences, and a protective sleeve expansion joint is set to cope with the thermal stress caused by the temperature difference, so that the structure has resistance to thermal stress deformation and pressure resistance, and realizes more efficient, more flexible and safer utilization of LNG cold energy recovery and synchronous power generation, and also simultaneously improves the economic efficiency of LNG cold energy recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of an LNG cold energy power generation type heat exchange device with integrated semiconductor components provided in an embodiment of the utility model Figure 1 ;

[0021] Figure 2 A schematic diagram of the structure of an LNG cold energy power generation type heat exchange device with integrated semiconductor components provided in an embodiment of the utility model Figure 2 ;

[0022] Figure 3 Schematic diagram of the arrangement of the tube holes of the tube sheet provided in the embodiment of the utility model Figure 1 ;

[0023] Figure 4 Schematic diagram of the arrangement of the tube holes of the tube sheet provided in the embodiment of the utility model Figure 2 ;

[0024] Figure 5 A schematic diagram of the structure of a power generation assembly provided by an embodiment of the utility model;

[0025] Figure 6 A cross-sectional schematic diagram of a power generation assembly provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0026] The following is a further detailed description through specific implementation methods:

[0027] The marks in the drawings in the specification include: outer shell 1, low-temperature LNG supply pipe inlet 11, NG outlet 12, first flange 13, tube sheet 2, second flange 21, pipe hole 22, head 3, high-temperature fluid supply pipe inlet 31, high-temperature fluid supply pipe outlet 32, high-temperature fluid inlet pipe box 33, high-temperature fluid outlet pipe box 34, power generation component 4, heat exchange tube 41, semiconductor element 42, protective sleeve 43, expansion joint 431, collection port 432, contact seat 433, third flange 434, bolt 435.

[0028] The embodiment is basically as shown in the attached Figure 1 As shown: an LNG cold energy power generation type heat exchange device with integrated semiconductor elements, including an outer shell 1 and a plurality of power generation components 4 installed in the outer shell.

[0029] In order to describe the structural arrangement more clearly, Figure 1 Up, down, left and right are defined in a conventional manner, but are not limited to this in actual application.

[0030] The outer shell 1 is provided with a cryogenic LNG supply pipe inlet 11 and an NG outlet 12 which are welded integrally with the outer shell 1, and a matching flange is installed at one end of the inlet and outlet away from the outer shell. The cryogenic LNG supply pipe inlet 11 and the NG outlet 12 are arranged relatively staggered. In this embodiment, the cryogenic LNG supply pipe inlet 11 is arranged on the left side of the bottom of the outer shell 1, and the NG outlet 12 is arranged on the right side of the top of the outer shell 1. The entire outer shell is 6000mm long in axial direction, with a cross-sectional diameter of 2000mm, a main inlet and outlet diameter of 1500mm, an LNG inlet temperature of about -170℃, and an outlet temperature of 15℃ (summer) or 5℃ (winter). The size of the entire shell can meet the requirements of compact layout of the structure and adapt to the space requirements for conventional on-site use.

[0031] like Figure 2As shown, the outer shell 1 can also be configured as a vertical type, the high-temperature fluid supply pipe inlet 31 is arranged at the lower part of the lower head 3, and the high-temperature fluid supply pipe outlet 32 ​​is arranged at the top of the upper head 3; the low-temperature LNG supply pipe inlet 11 is arranged on the right side of the bottom of the outer shell 1, and the NG outlet 12 is arranged on the left side of the upper part of the outer shell 1. LNG is fed in a controlled manner from the bottom of the outer shell, is in liquid phase at the bottom of the outer shell, and forms a gas phase at its top, and NG is discharged from the NG outlet. LNG and NG are in a suitable proportion to ensure orderly entry and discharge; this structure ensures the normal LNG cold energy power generation function, and can be matched with different system layout methods. The structure is flexible and changeable, and has strong versatility.

[0032] Tube sheets 2 are installed on both sides of the outer shell 1, and the outer shell 1 and the tube sheet 2 are coaxially installed through a first flange 13; a plurality of tube holes 22 are arranged on the tube sheet 2 according to a first preset method. In this embodiment, the center distance between adjacent tube holes is not less than 1.25 times the outer diameter of the heat exchange tube, which can meet the spacing between adjacent heat exchange tubes within a reasonable range and achieve sufficient heat exchange. The multiple is selected according to the size of the outer shell and the demand for heat exchange power generation; the tube holes are selected from DN40 stainless steel pipes. Figure 3 As shown, the first preset mode is that the relative positions of the tube holes are arranged according to an equilateral triangle (the dotted triangle example in the figure illustrates the relative positions of the tube holes); Figure 4 As shown, the first preset mode is that the relative positions of the tube holes are arranged in a square (the dotted square example in the figure illustrates the relative positions of the tube holes), and a total of 68 tube holes can be selected.

[0033] The main advantage of using an equilateral triangle layout is to improve the heat exchange efficiency, while the advantages of a square layout are lower pressure drop and easy cleaning. Specifically, the arrangement of an equilateral triangle layout can usually provide a larger heat exchange area, thereby improving the heat exchange efficiency. The angle between the fluid and the center line of the heat exchange tube when flowing helps to form a more ideal flow state, which is conducive to heat transfer. The structure of the equilateral triangle arrangement is relatively compact, and more tubes can be installed under the same tube sheet area, thereby increasing the heat exchange area. The square arrangement is widely applicable and can be used under different working conditions. Due to the characteristics of its structure, the pressure drop when the fluid passes through is lower, which means that less energy consumption is required to maintain the same flow rate. When the heat exchanger needs to be mechanically cleaned regularly, the square-arranged pipes are easier to clean and maintain.

[0034] The tube sheet 2 on both sides is installed with a head 3 on the side away from the outer shell 1. The head 3 is coaxially installed with the tube sheet 2 through the second flange 21, and is penetrated by bolts and coaxially installed with the outer shell 1. The head 3 on both sides is respectively installed with a high-temperature fluid supply pipe inlet 31 and a high-temperature fluid supply pipe outlet 32 ​​welded with the head 3, forming a high-temperature fluid inlet pipe box 33 and a high-temperature fluid outlet pipe box 34 (i.e., a cavity formed after the head and the tube sheet are connected). The high-temperature fluid supply pipe inlet 31 and the high-temperature fluid supply pipe outlet 32 ​​are arranged relatively staggered. In this embodiment, the high-temperature fluid supply pipe inlet 31 is set at the bottom of the left head, and the high-temperature fluid supply pipe outlet 32 ​​is set at the upper part of the right head. A pump is used as an external power source. The high-temperature fluid adopts a low-input and high-output method, which can ensure that the high-temperature fluid stays in the heat exchange tube for a relatively long time, meeting the reasonable and efficient power generation requirements. The high-temperature fluid can be seawater or hot water, and the high-temperature fluid temperature is generally in the range of 10℃-20℃. A matching flange is installed at one end of the high-temperature fluid supply pipe inlet and outlet away from the outer shell.

[0035] like Figure 5 As shown, the power generation assembly 4 includes a heat exchange tube 41; the heat exchange tube 41 is usually formed of stainless steel, but due to the high thermal expansion coefficient of 15×10 -6 / ℃, when LNG is vaporized as a cryogenic fluid, the shrinkage rate during the cooling process is 2.8mm / m. In this embodiment, a 64% Fe and 36% Ni alloy material is preferably used, and the thermal expansion coefficient is 1.7×10 -6 / ℃, the shrinkage rate during LNG cooling is 0.3mm / m, which can adapt well to the environment with large temperature difference.

[0036] The outer surface of the heat exchange tube 41 is installed with a plurality of semiconductor elements 42 according to the third preset method; the semiconductor elements are installed on the outer surface of the heat exchange tube by bonding, and silicone glue can be used, so that they will not peel off even at high or low temperatures. In this embodiment, the third preset method is that the semiconductor elements are evenly distributed along the outer diameter and radial direction of the heat exchange tube, that is, N groups are evenly distributed along the radial circumference of the heat exchange tube, and are evenly distributed parallel to the axial direction of the heat exchange tube. In this embodiment, N can be 5-8, with 60-90 semiconductor elements in each group, and the total number is 300-720. The semiconductor elements can use SHT036163 large temperature difference semiconductor power generation elements. Such an arrangement selection can meet the high-efficiency power generation requirements on the basis of compact structure.

[0037] A protective sleeve 43 is installed on the outside of the heat exchange tube 41 to cover several semiconductor components 42; several expansion joints 431 and several wire collection ports 432 are arranged on the protective sleeve. The expansion joint 431 is used to absorb the axial contraction of the protective sleeve 43 caused by the temperature difference between hot and cold. In this embodiment, two expansion joints are arranged, respectively close to the two ends of the protective sleeve, and the distance between the two expansion joints is controlled at 500-800mm to achieve effective expansion and contraction changes. There are contact holes on the semiconductor components, and the wires are connected to the contact holes to form a conductive path, and electricity is conducted through the wires. All semiconductor component wires are effectively and reasonably arranged, and the wire collection port 432 is used to aggregate the wires to collect the electricity generated by the semiconductor components. In this embodiment, one wire collection port is set, which is set at a position 50mm-100mm away from the left expansion joint and at a suitable position away from the expansion joint to avoid expansion and contraction interfering with the collection of electricity and ensure a good power collection effect.

[0038] like Figure 6 As shown, a contact seat 433 is provided on the inner side of the protective sleeve 43 and at a position opposite to the semiconductor element. The protective sleeve 43 contracts in the radial direction due to heat and cold, and its contact seat 434 can ensure that the inner surface of the protective sleeve is in contact with the semiconductor element, which can achieve good heat conduction and improve power generation efficiency. In this embodiment, the contact seat can be made of aluminum alloy or stainless steel material and is welded and installed on the protective sleeve to ensure the contact effect between the protective sleeve 43, the contact seat 434 and the semiconductor element.

[0039] Several of the power generation components 4 are installed between the tube sheets 2 on both sides through the tube holes 22 in a second preset manner. In this embodiment, the second preset manner is that all the power generation components are arranged in parallel along the axial direction of the outer shell. At this time, the tube sheets on both sides are symmetrically installed with the outer shell, so that each power generation component is connected along the axial direction of the outer shell through two symmetrical tube holes.

[0040] Specifically, the radial and axial gaps between the protective sleeve 43 and the heat exchange tube 41, and between the semiconductor elements 42 are filled with insulating materials, and the insulating materials can be polyester foam. The two ends of the heat exchange tube 41 are respectively installed on the tube holes 22 on both sides, wherein the outer diameter of the heat exchange tube 41 is adapted to the diameter of the tube holes 22; the two ends of the protective sleeve 43 are respectively installed on the tube sheets 2 on both sides, and the two ends of the protective sleeve 43 are installed with third flanges 434, which are penetrated through the first flange and the tube sheet by bolts 435 and nuts, and fixed into one. In this way, the connection between the power generation component 4 and the tube sheet 2 is realized.

[0041] The protective sleeve shrinks due to the low temperature liquefied gas. However, since the heat exchange tube has sufficient strength and there is enough insulating material between the protective sleeve and the heat exchange tube, the pressure caused by the expansion of the liquefied gas can be absorbed by the heat exchange tube and the insulating material. Therefore, the protective sleeve itself can be made of very thin material, and the semiconductor element can also be protected from greater pressure, there will be no deformation problem, and it will not affect the contact between the semiconductor element and the heat exchange tube and the protective sleeve. In view of this, the protective sleeve can be made of Invar alloy or aluminum.

[0042] The process of realizing LNG cold energy recovery and synchronous power generation using the device of this embodiment is mainly as follows:

[0043] High-temperature fluid seawater flows in from the inlet of the high-temperature fluid supply pipe, passes through one side head, one side tube hole, heat exchange tube, the other side tube hole, the other side head, and flows out from the inlet of the high-temperature fluid supply pipe; LNG from the LNG storage tank flows into the outer shell from the inlet of the low-temperature LNG supply pipe, flows outside several protective sleeves, and because there is high-temperature fluid flowing in the heat exchange tube inside the protective sleeve, heat is generated, and the low-temperature LNG sent into the outer shell is heated, absorbs heat and vaporizes into natural gas NG, and is discharged from the NG outlet. It should be noted that in order to ensure the reliability of the heat exchange process and ensure the smooth discharge of NG, in the horizontal heat exchanger, the LNG liquid level needs to be controlled at 2 / 3 of the total space of the shell, and the LNG liquid level can be submerged above the highest heat exchange tube; in the vertical heat exchanger, the LNG liquid level needs to be lower than the NG outlet to prevent the LNG liquid level from submerging the NG outlet. The LNG flow rate and seawater flow rate can be adjusted by manual valves, or by bypass adjustment, pump speed adjustment, etc. On the premise that accurate flow data can be obtained, an integrated method of feedback, feedforward and cascade control can be used to complete real-time control of LNG flow and seawater flow, and achieve accurate control of liquid level.

[0044] During the LNG vaporization process, high-temperature fluid flows through the inside of the heat exchange tube, and low-temperature LNG flows through the outside of the protective sleeve. The semiconductor element is covered by the protective sleeve to protect it from direct contact with LNG or natural gas. The semiconductor element located between the protective sleeve and the heat exchange tube absorbs cold energy on the outside and heat energy on the inside. An electromotive force is generated based on the temperature difference between the inside and the outside, which is extracted through the conductive wire and collected through the collection port to complete the collection of electrical energy generated by the semiconductor element.

[0045] Due to the existence of the temperature difference environment, the protective sleeve shrinks in the radial direction due to the cold and heat. Its contact seat can ensure that the inner surface of the protective sleeve contacts the semiconductor element, which can achieve good heat conduction and improve the power generation efficiency. The expansion joint can reduce the stress of the protective sleeve during heat exchange; when there is a temperature difference of 190℃ between the cold and hot sources, there is a shrinkage of about 2mm in a 1m long pipeline, which can be compensated by the expansion joint through deformation. The protective sleeve can move slightly at the expansion joint. Even if the axial center of the heat exchange tube and the protective sleeve is inconsistent, when the diameter of the protective sleeve shrinks, the heat exchange tube can also shrink through the expansion joint. The expansion joint can also absorb the axial contraction, so that the protective sleeve located between the expansion joints can move slightly in the radial direction, so that it can evenly contact the semiconductor element arranged on the outer surface of the heat exchange tube when it shrinks in the radial direction. The cross section of the protective sleeve is circular, so it has sufficient pressure resistance even when the pressure in the outer shell is high.

[0046] If the power generation of the semiconductor element is estimated to be 20W per piece (3.9cm×3.9cm), and 517 pieces / m are pasted on the outer circumference of each heat exchange tube, 2 Even considering the power generation loss, about 10kW / m 2 The actual power consumption can be reasonably set according to the actual needs.

[0047] The present embodiment provides an LNG cold energy power generation type heat exchange device with integrated semiconductor elements. It is different from the conventional method of using thermal cycle to realize cold energy power generation. It breaks through the technical prejudice of using conventional independent semiconductor temperature difference devices to integrate into the circulation system to realize temperature difference power generation. Instead, it effectively integrates semiconductor elements into the device of the present solution to directly and synchronously realize the cold energy recovery and power generation of LNG. It does not need to cooperate with complex systems for control, thus avoiding the complexity of the thermal cycle system. Based on the idea of ​​realizing the cold energy recovery and power generation of LNG simultaneously in the present solution, the layout of the entire device components is optimized, and the structure is simpler and more compact. Through the first preset method, the second preset method and the third preset method, the structural layout can be flexibly carried out according to actual needs, so that the entire device is more flexible, can adapt to more scenarios and system requirements, and has strong versatility. The thermal stress problem that may be caused by large temperature difference is also considered at the device design level, and a protective sleeve expansion joint is set to cope with the thermal stress caused by the temperature difference, so that the structure has resistance to thermal stress deformation and pressure resistance, and realizes more efficient, more flexible and safer utilization of LNG cold energy recovery and synchronous power generation, and also simultaneously improves the economic efficiency of LNG cold energy recovery.

[0048] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. An LNG cold energy power generation type heat exchange device with integrated semiconductor components, It is characterized in that It comprises an outer shell and a plurality of power generation components installed in the outer shell; tube sheets are installed on both sides of the outer shell; a plurality of tube holes are arranged on the tube sheets according to a first preset method; and a plurality of power generation components are installed between the tube sheets on both sides through the tube holes according to a second preset method; The power generation assembly includes a heat exchange tube; a plurality of semiconductor elements are installed on the outer surface of the heat exchange tube according to a third preset method; a protective sleeve is installed on the outer side of the heat exchange tube to cover the plurality of semiconductor elements; the protective sleeve is provided with a plurality of expansion joints and a plurality of line collection ports; The outer shell is provided with a low-temperature LNG supply pipe inlet and an NG outlet so that the low-temperature LNG flows outside the protective casing; the tube sheets on both sides are installed with heads on the side away from the outer shell; the heads on both sides are respectively installed with a high-temperature fluid supply pipe inlet and a high-temperature fluid supply pipe outlet so that the high-temperature fluid flows inside the heat exchange tube.

2. According to claim 1, a LNG cold energy power generation type heat exchange device with integrated semiconductor elements, It is characterized in that The two ends of the heat exchange tube are respectively installed on the tube holes on both sides, wherein the outer diameter of the heat exchange tube is matched with the diameter of the tube hole.

3. The LNG cold energy power generation type heat exchange device with integrated semiconductor elements according to claim 1, It is characterized in that The two ends of the protective sleeve are respectively installed on the tube sheets on both sides.

4. The LNG cold energy power generation type heat exchange device with integrated semiconductor elements according to claim 1, It is characterized in that The radial and axial gaps between the protective sleeve and the heat exchange tube, and between the semiconductor elements are filled with insulating materials.

5. The LNG cold energy power generation type heat exchange device with integrated semiconductor elements according to claim 1, It is characterized in that The first preset method is that the relative positions of the tube holes are arranged in an equilateral triangle or a square, and the center distance between adjacent tube holes is not less than 1.25 times the outer diameter of the heat exchange tube.

6. The LNG cold energy power generation type heat exchange device with integrated semiconductor elements according to claim 1, It is characterized in that The second preset mode is that all power generation components are arranged in parallel along the axial direction of the outer shell.

7. The LNG cold energy power generation type heat exchange device with integrated semiconductor elements according to claim 1, It is characterized in that The third preset manner is that the semiconductor elements are evenly distributed along the outer diameter and radial direction of the heat exchange tube.

8. The LNG cold energy power generation type heat exchange device with integrated semiconductor elements according to claim 1, It is characterized in that The semiconductor element is mounted on the outer surface of the heat exchange tube by bonding.

9. The LNG cold energy power generation type heat exchange device with integrated semiconductor elements according to claim 1, It is characterized in that A contact seat is arranged on the inner side of the protection sleeve and at a position opposite to the semiconductor element.

10. The LNG cold energy power generation type heat exchange device with integrated semiconductor elements according to claim 1, It is characterized in that The NG outlet and the low-temperature LNG supply pipe inlet are arranged in a relatively staggered manner; the high-temperature fluid supply pipe outlet and the high-temperature fluid supply pipe inlet are arranged in a relatively staggered manner.

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