Compact multi-zone heat exchanger

Abstract

The present invention relates to the field of heat exchange technology, and discloses a compact multi-zone heat exchanger, including a heat exchange space formed by an outer shell, an inlet tube sheet and an outlet tube sheet, wherein the inlet tube sheet is installed at one end of the outer shell, and the outlet tube sheet is installed at the other end of the outer shell, and a plurality of heat exchange tubes are arranged in the heat exchange space through the inlet tube sheet and the outlet tube sheet, and n surrounding tubes are also arranged in the heat exchange space, and the n surrounding tubes divide the heat exchange space into n+1 heat exchange partitions, and each heat exchange partition is provided with a heat exchange tube. The compact multi-zone heat exchanger provided in an embodiment of the present invention divides the heat exchange space into a plurality of mutually isolated heat exchange partitions through the surrounding tubes, so that one tube-side heat exchange medium can be used for parallel heat exchange of two or more shell-side heat exchange mediums, and has a compact structure, which can significantly reduce the number of heat exchangers required, the overall weight and size, and the installation space occupied, and is helpful to improve the integration level and comprehensive benefits of the heat exchange system.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, in particular to a compact multi-zone heat exchanger. Background Art

[0002] Heat exchangers are important functional equipment in ship power systems, and they are responsible for cooling various working fluids such as steam, lubricating oil, and refrigerants. Affected by complex environments and operating factors such as marine salt spray, vibration and shock, ship heat exchangers use shell and tube heat exchangers in large quantities. Shell and tube heat exchangers have the advantages of mature design methods, strong pressure bearing capacity, and high reliability, but they also have disadvantages such as large weight and volume, low heat exchange efficiency, and high metal consumption. In addition, ship heat exchangers are of various types and different heat exchange media. In traditional designs, a single heat exchanger can only undertake one heat exchange function, resulting in a large number of types and quantities of ship heat exchangers and a large space occupied in the cabin; in addition, each heat exchanger needs to be equipped with fluid pipelines and pump and valve equipment separately, which further leads to a large and complex heat exchange system, becoming an important factor restricting the optimization of ship cabin layout and the improvement of load capacity. Summary of the invention

[0003] The embodiment of the present invention provides a compact multi-zone heat exchanger to solve the problems of the existing ship heat exchangers having a large variety and quantity, occupying a large cabin space, and having a large and complex system.

[0004] An embodiment of the present invention provides a compact multi-zone heat exchanger, comprising a heat exchange space formed by an outer shell, an inlet tube sheet and an outlet tube sheet, wherein the inlet tube sheet is installed at one end of the outer shell, and the outlet tube sheet is installed at the other end of the outer shell, and a plurality of heat exchange tubes are arranged in the heat exchange space through the inlet tube sheet and the outlet tube sheet, and n surrounding tubes are further provided in the heat exchange space, wherein the n surrounding tubes divide the heat exchange space into n+1 heat exchange zones, and each of the heat exchange zones is provided with the heat exchange tube.

[0005] Among them, a plurality of heat exchange tubes are arranged in parallel in the heat exchange space, the enclosure is a cylindrical structure, and the axis of the enclosure is arranged in parallel with the heat exchange tubes.

[0006] Wherein, a surrounding cylinder is provided in the heat exchange space, and the surrounding cylinder divides the heat exchange space into a heat exchange zone inside the cylinder and a heat exchange zone outside the cylinder;

[0007] The outer shell is provided with an outer shell medium inlet pipe and an outer shell medium outlet pipe on the side wall, and the surrounding cylinder is provided with an inner shell medium inlet pipe and an inner shell medium outlet pipe passing through the outer shell side wall on the side wall.

[0008] The inner shell side working medium inlet pipe and the inner shell side working medium outlet pipe are parallel and spaced apart along the axial direction of the heat exchange tube.

[0009] Wherein, the inner-shell working medium inlet pipe and the inner-shell working medium outlet pipe are both elliptical cross-sections, and the major axis direction of the elliptical cross-section is consistent with the axial direction of the heat exchanger.

[0010] The cross section of the heat exchange partition outside the cylinder is circular, and a spiral baffle is provided along the outer wall of the surrounding cylinder. The spiral baffle extends along the axial direction of the surrounding cylinder, and the outer side of the spiral baffle is connected to the inner wall of the outer shell.

[0011] Wherein, the heat exchange partition in the cylinder is provided with a bow-shaped baffle or a cross baffle rod along the axial direction of the surrounding cylinder.

[0012] Wherein, a support tube is arranged between the inner-shell working medium inlet tube and the inner-shell working medium outlet tube, and the support tube is arranged in parallel with the heat exchange tube.

[0013] Wherein, a first enclosure and a second enclosure are provided in the heat exchange space, the inner diameter of the second enclosure is larger than the outer diameter of the first enclosure, and the first enclosure and the second enclosure are coaxially arranged;

[0014] The first enclosure is a circular heat exchange partition, the first enclosure is between the first enclosure and the second enclosure is a first heat exchange partition, and the second enclosure and the outer shell are between the second enclosure and the outer shell.

[0015] A first shell-side working medium inlet pipe and a first shell-side working medium outlet pipe passing through the side wall of the second shell and the side wall of the outer shell are provided on the side wall of the first shell;

[0016] A second shell-side working medium inlet pipe and a second shell-side working medium outlet pipe are provided on the side wall of the second shroud, passing through the side wall of the outer shell;

[0017] The first shell-side working medium inlet pipe, the first shell-side working medium outlet pipe, the second shell-side working medium inlet pipe and the second shell-side working medium outlet pipe are parallel and spaced apart along the axial direction of the heat exchange tube.

[0018] The first shell-side working fluid inlet pipe, the first shell-side working fluid outlet pipe, the second shell-side working fluid inlet pipe and the second shell-side working fluid outlet pipe are all elliptical cross-sections, and the major axis direction of the elliptical cross-section is consistent with the axial direction of the heat exchanger.

[0019] Wherein, the heat exchanger also includes a tube-side inlet header and a tube-side outlet header, the tube-side inlet header is connected to one end of the outer shell on which the inlet tube sheet is installed, the tube-side outlet header is connected to one end of the outer shell on which the outlet tube sheet is installed, the tube-side inlet header is provided with a tube-side working fluid inlet, and the tube-side outlet header is provided with a tube-side working fluid outlet.

[0020] The compact multi-zone heat exchanger provided in the embodiment of the present invention divides the heat exchange space into a plurality of mutually isolated heat exchange zones through a surrounding tube, so that one tube-side heat exchange medium can be used to perform heat exchange on two or more shell-side heat exchange mediums in parallel. The structure is compact and can significantly reduce the required number of heat exchangers, the overall weight and size, and the occupied installation space, which helps to improve the integration level and comprehensive benefits of the heat exchange system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a compact multi-zone heat exchanger provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of heat exchange partitions of a tube side of a compact multi-partition heat exchanger provided in another embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a heat exchange partition support scheme for a compact multi-partition heat exchanger tube side provided by another embodiment of the present invention;

[0025] In the figure: 1. Tube-side working fluid inlet; 2. Tube-side inlet header; 3. Inlet tube sheet; 4. Shell-shell side working fluid inlet pipe; 5. Shell; 6. Second surrounding tube; 7. First surrounding tube; 8. Second heat exchange zone; 9. First heat exchange zone; 10. Circular heat exchange zone; 11. Shell-shell side working fluid outlet pipe; 12. Outlet tube sheet; 13. Tube-side outlet header; 14. Tube-side working fluid outlet; 15. Second shell-side working fluid inlet pipe; 16. First shell-side working fluid inlet pipe; 17. First shell-side working fluid outlet pipe; 18. Second shell-side working fluid outlet pipe; 19. Shell-side inlet and outlet pipe support pipe arrangement area; 20. Spiral baffle; 21. Heat exchange tube; 22. Arched baffle. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Furthermore, in the description of the present invention, unless otherwise specified, “plurality”, “multiple roots”, and “multiple groups” mean two or more.

[0030] like Figure 1 , Figure 2 As shown, an embodiment of the present invention provides a compact multi-zone heat exchanger, including a heat exchange space formed by an outer shell 5, an inlet tube sheet 3 and an outlet tube sheet 12, wherein the inlet tube sheet 3 is installed at one end of the outer shell 5, and the outlet tube sheet 12 is installed at the other end of the outer shell 5. A plurality of heat exchange tubes 21 are arranged in the heat exchange space through the inlet tube sheet 3 and the outlet tube sheet 12, wherein the tube-side heat exchange medium inlet end of the heat exchange tube 21 is installed at the inlet tube sheet 3, and the shell-side heat exchange medium outlet end of the heat exchange tube 21 is installed at the outlet tube sheet 12; in the heat exchange space, the space between the outer wall surfaces of the plurality of heat exchange tubes 21 forms a flow space for the shell-side heat exchange medium; the tube-side heat exchange medium flows into the heat exchange tube 21 through the inlet tube sheet 3, exchanges heat with the shell-side heat exchange medium in the heat exchange space, and then flows out of the heat exchange tube 21 through the outlet tube sheet 12, completing the heat exchange process between the tube-side heat exchange medium and the shell-side heat exchange medium.

[0031] The compact multi-zone heat exchanger provided in the embodiment of the present invention is also provided with n surrounding tubes in the heat exchange space, one end of the surrounding tubes is connected to the inlet tube sheet 3, and the other end is connected to the outlet tube sheet 12. Each surrounding tube is independently arranged, and the n independently arranged surrounding tubes divide the heat exchange space into n+1 mutually independent heat exchange zones, and each heat exchange zone is provided with a heat exchange tube 21, so that different shell-side heat exchange working fluids can be introduced into different heat exchange zones to exchange heat with tube-side heat exchange working fluids. The heat exchange tubes 21 of different heat exchange zones can contain the same tube-side heat exchange working fluid, so as to realize the parallel heat exchange of one tube-side working fluid with multiple shell-side heat exchange working fluids. Among them, the shell-side heat exchange working fluids of each heat exchange zone are independent of each other and do not affect each other, and can be in heating or cooling mode according to application requirements.

[0032] Therefore, the compact multi-partition heat exchanger provided in the embodiment of the present invention divides the heat exchange space into multiple mutually isolated heat exchange partitions through the surrounding tube, so that one tube-side heat exchange medium can be used to perform heat exchange on two or more shell-side heat exchange mediums in parallel. It has a compact structure and can significantly reduce the required number of heat exchangers, the overall weight and size, and the occupied installation space, which helps to improve the integration level and comprehensive benefits of the heat exchange system.

[0033] In a specific embodiment, a plurality of heat exchange tubes 21 are arranged in parallel in the heat exchange space to form a dense tube bundle. The surrounding tube is a cylindrical structure, and the axis of the surrounding tube is arranged parallel to the heat exchange tubes 21, so that the heat exchanger structure is more compact.

[0034] In a specific embodiment, a surrounding tube is provided in the heat exchange space, and the surrounding tube divides the heat exchange space into two heat exchange zones: an inner heat exchange zone and an outer heat exchange zone. The heat exchange space inside the surrounding tube is the inner heat exchange zone, and the heat exchange space between the surrounding tube and the outer shell 5 is the outer heat exchange zone. The side wall of the outer shell 5 is provided with a shell-side working medium inlet pipe 4 and a shell-side working medium outlet pipe 11. One shell-side heat exchange medium enters the outer heat exchange zone from the shell-side working medium inlet pipe 4, and after heat exchange with the tube-side heat exchange medium in the heat exchange tube 21 of the outer heat exchange zone, it flows out from the shell-side working medium outlet pipe 11. The side wall of the surrounding tube is provided with an inner shell-side working medium inlet pipe and an inner shell-side working medium outlet pipe that pass through the side wall of the outer shell 5. Another shell-side heat exchange medium enters the inner heat exchange zone from the inner shell-side working medium inlet pipe, and after heat exchange with the tube-side heat exchange medium in the heat exchange tube 21 of the inner heat exchange zone, it flows out from the inner shell-side working medium outlet pipe. Since the inner shell-side medium inlet pipe and the inner shell-side medium outlet pipe both pass through the outer heat exchange partition between the surrounding tube and the outer shell 5, the space occupied by the inlet and outlet pipes cannot be used to arrange the heat exchange tube 21, thereby reducing the heat exchange performance of the outer heat exchange partition; in order to reduce the adverse effect on the heat exchange performance, the inner shell-side medium inlet pipe and the inner shell-side medium outlet pipe can be arranged in parallel and spaced along the axial direction of the heat exchange tube 21 to reduce the area occupied by the inner shell-side medium inlet pipe and the inner shell-side medium outlet pipe in the cross section perpendicular to the heat exchange tube 21 bundle, and increase the effective layout area of ​​the heat exchange tube 21 bundle. In addition, the inner shell-side medium inlet pipe and the inner shell-side medium outlet pipe can also be set to an elliptical cross section, and the major axis direction of the elliptical cross section is consistent with the axial direction of the heat exchanger, so as to further reduce the area occupied by the inner shell-side medium inlet pipe and the inner shell-side medium outlet pipe in the cross section perpendicular to the heat exchange tube 21 bundle.

[0035] In a specific embodiment, Figure 3 As shown, the outer shell 5 of the heat exchanger is cylindrical, and the cylindrical outer shell 5 and the cylindrical surrounding tube are arranged coaxially, and the cross-section of the heat exchange partition outside the tube in the direction perpendicular to the heat exchange tube 21 is annular. A spiral baffle 20 is set along the outer wall of the surrounding tube in the heat exchange partition outside the tube, and the surrounding tube that separates each heat exchange partition also serves as the core of the spiral baffle 20. The inner side of the spiral baffle 20 extends axially along the surface of the surrounding tube, and there is no need to set a special core tube. The outer side of the spiral baffle 20 is connected to the inner wall of the outer shell 5, and the spiral baffle 20 plays a supporting role. The spiral baffle 20, the inner surrounding tube, and the outer shell 5 of the heat exchanger together constitute a closed spiral flow channel in the shell side of the heat exchanger. The shell side heat exchange medium spirally flows around the heat exchange tube 21 bundle in the channel to avoid longitudinal leakage of the medium and improve the heat exchange performance.

[0036] In a specific embodiment, the surrounding cylinder is a cylindrical structure, and the heat exchange partition in the cylinder is circular. The support scheme of the heat exchange tube 21 bundle of the circular heat exchange partition 10 can be adopted by the arcuate baffle 22. The shell-side heat exchange medium enters from the shell-side medium inlet pipe in the cylinder, flows along the heat exchange tube 21 bundle in the circular heat exchange partition in the cylinder, and changes the flow direction multiple times under the guidance of the arcuate baffle 22. After heat exchange with the tube-side heat exchange medium, it is discharged from the shell-side medium outlet pipe in the cylinder. According to specific use requirements, the arcuate baffle 22 can also be replaced by a support scheme such as a cross baffle rod.

[0037] In a specific embodiment, a support tube is provided between the inner shell side working medium inlet pipe and the inner shell side working medium outlet pipe, and the support tube is provided in parallel with the heat exchange tube 21. Specifically, in the position where the heat exchange tube 21 cannot be arranged in the annular outer heat exchange partition occupied by the inner shell side working medium inlet pipe and the inner shell side working medium outlet pipe, a support tube parallel to the heat exchange tube 21 can be provided to play a certain supporting role. When a spiral baffle 20 is arranged in the annular outer heat exchange partition, the support tube can have the same arrangement as the heat exchange tube 21 bundle, and the support tube is fixed to the spiral baffle 20 to maintain the integrity of the arrangement of the spiral heat exchange channel bundle and play a supporting role.

[0038] In a specific embodiment, two enclosures are provided in the heat exchange space: a first enclosure 7 and a second enclosure 6. The inner diameter of the second enclosure 6 is larger than the outer diameter of the first enclosure 7, and the first enclosure 7 and the second enclosure 6 are coaxially arranged. A circular heat exchange partition 10 is provided in the first enclosure 7, a first heat exchange partition 9 is provided between the first enclosure 7 and the second enclosure 6, and a second heat exchange partition 8 is provided between the second enclosure 6 and the outer shell 5. The first heat exchange partition 9 is an annular heat exchange partition. When the outer shell 5 is a cylindrical structure and is coaxially arranged with the first and second enclosures 6, the second heat exchange partition 8 is also an annular heat exchange partition. A first shell-side working fluid inlet pipe 16 and a first shell-side working fluid outlet pipe 17 are provided on the side wall of the first enclosure 7, which pass through the side wall of the second enclosure 6 and the side wall of the outer shell 5; a second shell-side working fluid inlet pipe 15 and a second shell-side working fluid outlet pipe 18 are provided on the side wall of the second enclosure 6, which pass through the side wall of the outer shell 5. In order to reduce the problem of heat exchange caused by the inability to arrange the heat exchange tube bundle 21 due to the space occupied by the inlet and outlet pipes of the shell-side working medium in the outer shell 5, the first shell-side working medium inlet pipe 16, the first shell-side working medium outlet pipe 17, the second shell-side working medium inlet pipe 15 and the second shell-side working medium outlet pipe 18 are parallel and arranged at intervals along the axial direction of the heat exchange tube 21. Furthermore, the first shell-side working medium inlet pipe 16, the first shell-side working medium outlet pipe 17, the second shell-side working medium inlet pipe 15 and the second shell-side working medium outlet pipe 18 are all elliptical cross-sections, and the major axis direction of the elliptical cross-section is consistent with the axial direction of the heat exchanger.

[0039] It should be noted that the compact multi-zone heat exchanger provided by the present invention can have a heat exchange space that can be divided into n+1 mutually independent heat exchange zones by n surrounding cylinders. When n is greater than 2, and the n surrounding cylinders and the outer shell 5 of the heat exchanger are cylindrical structures with successively larger inner diameters, the n surrounding cylinders and the outer shell 5 of the heat exchanger can be coaxially arranged to form n+1 mutually independent heat exchange zones, wherein a circular heat exchange zone 10 is formed in the surrounding cylinder with the smallest inner diameter, and the outer side walls of the adjacent inner ring surrounding cylinders and the inner side walls of the outer ring surrounding cylinders form an annular heat exchange zone, and the heat exchange space is divided into a circular heat exchange zone 10 and n annular heat exchange zones. Except for the outermost annular heat exchange partition, the shell-side medium inlet and outlet pipes of the remaining n-1 annular heat exchange partitions and the circular heat exchange partition 10 can be arranged in parallel and spaced along the axial direction of the heat exchange tube 21, and are arranged as elliptical cross-sections, and the major axis direction of the elliptical cross-section is consistent with the axial direction of the heat exchanger, so as to reduce the problem of heat exchange caused by the space occupied by the shell-side medium inlet and outlet pipes in the outer shell 5 and the inability to arrange the heat exchange tube 21 bundle. Each annular heat exchange partition can be supported by a spiral baffle 20, and the spiral baffle 20, the inner surrounding cylinder, and the outer surrounding cylinder (or the outer shell 5 of the heat exchanger) together constitute a closed spiral flow channel of the shell side of the heat exchanger. The shell-side heat exchange medium spirally flows around the heat exchange tube 21 bundle in the channel to avoid longitudinal leakage of the medium and improve the heat exchange performance. The spiral baffles 20 of each annular heat exchange partition can be designed with different pitches and spiral angles to adapt to the differences in different heat exchange media and heat exchange requirements, and ensure that each annular heat exchange partition has the best transverse flow section and tube bundle flow velocity. The heat exchange tubes 21 cannot be arranged in the flow channel of the annular heat exchange partition occupied by the shell-side medium inlet and outlet pipes. By setting a support pipe with the same arrangement as the heat exchange tube 21 bundle and fixing it with the spiral baffle 20, the integrity of the spiral heat exchange channel bundle arrangement is maintained and it also has a supporting function. The shell-side inlet and outlet pipe support pipe arrangement area 19 is as shown in FIG. Figure 2 shown.

[0040] In a specific embodiment, the heat exchanger further includes a tube-side inlet header 2 and a tube-side outlet header 13. The tube-side inlet header 2 is connected to one end of the outer shell 5 where the inlet tube sheet 3 is installed, and the tube-side outlet header 13 is connected to one end of the outer shell 5 where the outlet tube sheet 12 is installed. The tube-side inlet header 2 is provided with a tube-side working medium inlet 1, and the tube-side outlet header 13 is provided with a tube-side working medium outlet 14. The heat exchange working medium of the heat exchanger tube-side shares the same inlet and outlet headers, and uses the same tube-side to exchange heat for multiple shell-side heat exchange partitions and different working mediums to be exchanged, so that the heat exchanger is further integrated, compact, and multifunctional, significantly reducing the weight and size of the heat exchanger and the installation space occupied, and improving the integration level and comprehensive benefits of the heat exchange system.

[0041] It can be seen from the above embodiments that the compact multi-partition heat exchanger provided by the present invention divides the heat exchange space into a plurality of mutually isolated heat exchange partitions through a surrounding tube, so that one tube-side heat exchange medium can be used to perform heat exchange on two or more shell-side heat exchange mediums in parallel. The structure is compact and can significantly reduce the required number of heat exchangers, the overall weight and size, and the occupied installation space, which helps to improve the integration level and comprehensive benefits of the heat exchange system.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A compact multi-zone heat exchanger, comprising a heat exchange space formed by an outer shell, an inlet tube sheet and an outlet tube sheet, wherein the inlet tube sheet is installed at one end of the outer shell, and the outlet tube sheet is installed at the other end of the outer shell, and a plurality of heat exchange tubes are arranged in the heat exchange space through the inlet tube sheet and the outlet tube sheet, characterized in that: The heat exchange space is further provided with n surrounding cylinders, and the n surrounding cylinders divide the heat exchange space into n+1 mutually independent heat exchange partitions, and each of the heat exchange partitions is provided with the heat exchange pipe; Each independent heat exchange partition is used for introducing shell-side heat exchange medium; each heat exchange tube is used for introducing tube-side heat exchange medium.

2. The compact multi-zone heat exchanger according to claim 1, characterized in that: A plurality of heat exchange tubes are arranged in parallel in the heat exchange space, the enclosure is a cylindrical structure, and the axis of the enclosure is arranged in parallel with the heat exchange tubes.

3. The compact multi-zone heat exchanger according to claim 2, characterized in that: A surrounding cylinder is provided in the heat exchange space, and the surrounding cylinder divides the heat exchange space into an inner heat exchange zone and an outer heat exchange zone; The outer shell is provided with an outer shell medium inlet pipe and an outer shell medium outlet pipe on the side wall, and the surrounding cylinder is provided with an inner shell medium inlet pipe and an inner shell medium outlet pipe passing through the outer shell side wall on the side wall. The inner shell side working medium inlet pipe and the inner shell side working medium outlet pipe are parallel and spaced apart along the axial direction of the heat exchange tube.

4. The compact multi-zone heat exchanger according to claim 3, characterized in that: The working medium inlet pipe in the inner shell side of the cylinder and the working medium outlet pipe in the inner shell side of the cylinder are both elliptical cross-sections, and the major axis direction of the elliptical cross-section is consistent with the axial direction of the heat exchanger.

5. The compact multi-zone heat exchanger according to claim 3, characterized in that: The cross-section of the heat exchange partition outside the cylinder is annular, and a spiral baffle is provided along the outer side wall of the circumferential cylinder. The spiral baffle extends along the axial direction of the circumferential cylinder, and the outer side of the spiral baffle is connected to the inner side wall of the outer shell.

6. The compact multi-zone heat exchanger according to claim 3, characterized in that: The heat exchange partition in the cylinder is provided with a bow-shaped baffle plate or a cross baffle rod along the axis direction of the surrounding cylinder.

7. The compact multi-zone heat exchanger according to claim 3, characterized in that: A support tube is arranged between the inner shell side working medium inlet tube and the inner shell side working medium outlet tube, and the support tube is arranged in parallel with the heat exchange tube.

8. The compact multi-zone heat exchanger according to claim 2, characterized in that: A first shroud and a second shroud are provided in the heat exchange space, the inner diameter of the second shroud is larger than the outer diameter of the first shroud, and the first shroud and the second shroud are coaxially arranged; The first enclosure is a circular heat exchange partition, the first enclosure is between the first enclosure and the second enclosure is a first heat exchange partition, and the second enclosure and the outer shell are between the second enclosure and the outer shell. A first shell-side working medium inlet pipe and a first shell-side working medium outlet pipe passing through the side wall of the second shell and the side wall of the outer shell are provided on the side wall of the first shell; A second shell-side working medium inlet pipe and a second shell-side working medium outlet pipe are provided on the side wall of the second shroud, passing through the side wall of the outer shell; The first shell-side working medium inlet pipe, the first shell-side working medium outlet pipe, the second shell-side working medium inlet pipe and the second shell-side working medium outlet pipe are parallel and spaced apart along the axial direction of the heat exchange tube.

9. The compact multi-zone heat exchanger according to claim 8, characterized in that: The first shell-side working fluid inlet pipe, the first shell-side working fluid outlet pipe, the second shell-side working fluid inlet pipe and the second shell-side working fluid outlet pipe all have elliptical cross-sections, and the major axis direction of the elliptical cross-section is consistent with the axial direction of the heat exchanger.

10. The compact multi-zone heat exchanger according to claim 1, characterized in that: The heat exchanger also includes a tube-side inlet header and a tube-side outlet header. The tube-side inlet header is connected to one end of the outer shell on which the inlet tube sheet is mounted, and the tube-side outlet header is connected to one end of the outer shell on which the outlet tube sheet is mounted. The tube-side inlet header is provided with a tube-side working fluid inlet, and the tube-side outlet header is provided with a tube-side working fluid outlet.

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