Winding pipe type heat exchanger with built-in gas-liquid separator

Abstract

A winding pipe type heat exchanger with a built-in gas-liquid separator comprises a shell pass cylinder, a gas-liquid separator and a gas-liquid separator, the tube box is arranged on the tube plate, and a tube pass outlet connecting tube is arranged on the top wall of the tube box; the upper end of the heat exchange tube is supported on the tube plate; a gas-liquid separator; the first guide cylinder is vertically arranged at the position, close to the tube pass outlet connecting pipe, in the tube box so that the gas-liquid separator can be arranged in the first guide cylinder to conduct gas-liquid separation on media entering the first guide cylinder, and the edge of an opening in the upper end of the first guide cylinder is attached to the top wall of the tube box and located on the periphery of the tube pass outlet connecting pipe; the lower end opening edge of the first guide cylinder and the upper plate surface of the tube plate are arranged at intervals; the flow area of the first guide cylinder on the cross section is smaller than that of the tube box and larger than that of the tube pass outlet connecting tube; and the liquid phase outlet connecting pipe is arranged on the side wall of the lower part of the pipe box and is adjacent to the pipe plate. According to the utility model, the gas-liquid separation of the tube pass medium can be realized, and the pressure loss of the tube pass medium can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and particularly relates to a wound tube heat exchanger with an internal gas-liquid separator. Background Art

[0002] As a new type of high-efficiency heat exchanger, the wound tube heat exchanger has the characteristics of compact structure, high heat transfer coefficient, good thermal compensation, and basically no heat transfer dead zone, and is widely used in multiple fields such as low-temperature methanol washing, air separation, and oil refining.

[0003] The structures of existing wound tube heat exchangers are disclosed in structures such as the Chinese invention patent "A Wound Tube Heat Exchanger for Gas Absorption" with the patent number 201910358285.9 and the authorization announcement number CN109999619B, and the Chinese utility model patent "A Wound Tube Heat Exchanger with a Cleaning Structure" with the patent number 202223107689.7 and the authorization announcement number CN218846956U. When in use, the shell-side medium in the shell-side cylinder body exchanges heat with the tube-side medium in the heat exchange tubes.

[0004] However, during heat exchange, there will be a situation where the tube-side medium appears as a gas-liquid two-phase mixture, and the process requires the separation of the gas-liquid two phases in the tube-side medium.

[0005] To solve the problem of gas-liquid two-phase separation, an existing gas-liquid separator is generally set in the heat exchanger, but the gas-liquid separation effect of the gas-liquid separator in the special environment of the heat exchanger needs to be improved, and at the same time, the influence of the setting of the gas-liquid separator on the pressure loss of the medium in the heat exchanger needs to be reduced. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a wound tube heat exchanger with an internal gas-liquid separator according to the current situation of the existing technology, so as to effectively separate the gas-liquid two phases of the tube-side medium and reduce the pressure loss of the tube-side medium at the same time.

[0007] The technical solution adopted by the utility model to solve the above technical problem is as follows: A wound tube heat exchanger with an internal gas-liquid separator, comprising:

[0008] A vertically arranged shell-side cylinder body, the upper end of which is provided with a tube sheet;

[0009] A tube box, arranged on the tube sheet, and a tube-side outlet connection pipe is arranged on the top wall of the tube box;

[0010] Heat exchange tubes, axially arranged in the shell-side cylinder body and spirally wound from the inside to the outside into multiple layers of spiral tubes, and the upper ends of the heat exchange tubes are supported on the tube sheet and communicated with the tube box;

[0011] A gas-liquid separator, having a gas outlet for the separated gas phase to flow upward and a liquid outlet for the separated liquid phase to flow downward;

[0012] It is characterized by further comprising:

[0013] A first guide cylinder, vertically arranged in the tube box, adjacent to the tube side outlet nozzle, for the gas-liquid separator to be arranged therein to separate the gas and liquid of the medium entering the first guide cylinder. The upper opening edge of the first guide cylinder is attached to the top wall of the tube box and is located outside the tube side outlet nozzle. The lower opening edge of the first guide cylinder is spaced from the upper plate surface of the tube sheet. And the flow area of the first guide cylinder in the cross section is smaller than that of the tube box and larger than that of the tube side outlet nozzle;

[0014] A liquid phase outlet nozzle, arranged on the side wall of the lower part of the tube box, adjacent to the tube sheet.

[0015] During use, the liquid phase medium output from the upper end of the heat exchange tube can be discharged through the liquid phase outlet nozzle. The gas phase medium flows upward and is separated by the gas-liquid separator. The separated liquid phase is discharged from the liquid phase outlet nozzle, and the separated gas phase flows upward and is discharged from the tube side outlet nozzle, thereby realizing the gas-liquid separation of the tube side medium. And in the present utility model, the design of the first guide cylinder can be used to restrain the gas-liquid separator and can also play a guiding role, so that the gas phase in the tube box can be collected into the first guide cylinder for gas-liquid separation, ensuring the gas-liquid separation effect. And because the first guide cylinder is relatively close to the tube side outlet nozzle and the flow area of the first guide cylinder in the cross section is smaller than that of the tube box and larger than that of the tube side outlet nozzle, the pressure loss generated when the gas phase in the tube box passes through the first guide cylinder can be reduced.

[0016] And the first guide cylinder and the gas-liquid separator of the present utility model utilize the space design in the tube box, which can effectively save the installation space.

[0017] Preferably, it further comprises a flow equalizing plate, horizontally arranged below the gas-liquid separator in the first guide cylinder, and through holes penetrating the plate thickness are uniformly distributed on the flow equalizing plate. The flow equalizing plate can equalize the flow of the medium before entering the gas-liquid separator, which is beneficial to improving the gas-liquid separation effect.

[0018] For the convenience of disassembly, assembly and maintenance, preferably, the first guide cylinder is formed by butt-jointing an upper cylinder body and a lower cylinder body in a detachable manner, and a first component for restraining the gas-liquid separator and a second component for restraining the flow equalizing plate are arranged on the inner wall of the lower cylinder body.

[0019] Preferably, the upper cylinder and the lower cylinder are connected by a pair of first flanges and first flange bolts. Along the circumference, first lugs are provided on the inner wall of the lower cylinder at positions relatively close to the first flange as the above-mentioned first component for placing the gas-liquid separator thereon; along the circumference, second lugs are provided on the inner wall of the lower cylinder at positions relatively far from the first flange as the above-mentioned second component for attaching the flow equalizing plate below the second component. In this way, the disassembly and assembly of the gas-liquid separator and the flow equalizing plate are facilitated.

[0020] In the above solution, preferably, the gas-liquid separator includes a plurality of vertically arranged separation plates. The plurality of separation plates are arranged at intervals in the horizontal direction. A channel that penetrates up and down is formed between the plate surfaces of two adjacent separation plates. The upper port of the channel is the gas outlet of the gas-liquid separator, and the lower port of the channel is the liquid outlet of the gas-liquid separator.

[0021] In addition, the gas-liquid separator can also adopt existing structures such as wire mesh demisters.

[0022] Preferably, each separation plate has a wavy structure in the up and down directions.

[0023] In the above solutions, to further facilitate disassembly, repair and maintenance, preferably, the tube sheet is composed of an upper part and a lower part butt-jointed by a pair of second flanges and second flange bolts. The tube-side outlet nozzle and the first guide cylinder equipped with the gas-liquid separator are both arranged in the upper part of the tube sheet, and the liquid-phase outlet nozzle is arranged in the lower part of the tube sheet.

[0024] To further improve the gas-liquid separation effect, preferably, the spiral wound heat exchanger further includes:

[0025] A second guide cylinder, vertically arranged in the lower part of the tube sheet. A ring cavity is formed between the side wall of the second guide cylinder and the side wall of the lower part of the tube sheet at an interval. The lower end of the second guide cylinder is open and surrounds the periphery of the upper end of the heat exchange tube so that the tube-side medium output from the upper end of the heat exchange tube can enter the second guide cylinder.

[0026] A cover plate, located in the lower part of the tube sheet and above the second guide cylinder. The upper plate surface of the cover plate is arranged at an interval from the opening edge of the lower end of the first guide cylinder. Denote the space above the cover plate in the tube sheet as the upper chamber. A gap is formed between the lower plate surface of the cover plate and the open edge of the upper end of the second guide cylinder at an interval so that the ring cavity is communicated with the internal space of the second guide cylinder. The side of the cover plate is located outside the open edge of the upper end of the second guide cylinder and is arranged at an interval from the side wall of the tube sheet to form an annular gap. The annular gap communicates the upper chamber with the ring cavity.

[0027] The liquid-phase outlet nozzle is arranged corresponding to the lower part of the ring cavity.

[0028] In the present utility model, the design of the second guide cylinder and the cover plate can perform the first stage of gas-liquid separation on the tube-side medium output from the upper end of the heat exchange tube, enabling the liquid phase to flow along the lower plate surface of the cover plate into the annular cavity and be output through the liquid-phase outlet connection pipe. The gas phase can flow upward into the upper cavity and be output through the tube-side outlet connection pipe after the second stage of gas-liquid separation by the gas-liquid separator, thus achieving two stages of gas-liquid separation for the tube-side medium and improving the gas-liquid separation effect. Moreover, the second guide cylinder and the cover plate of the present utility model utilize the space design within the tube box, which can effectively save the installation space.

[0029] Preferably, the cover plate has an arc-shaped structure that arches upward with a high center and low sides. The arc-shaped cover plate has the following functions: 1. It is beneficial for the liquid phase to flow downward along its lower surface and into the annular cavity; 2. It can reduce the pressure loss and is conducive to the fluidity of the tube-side medium; 3. The upper surface of the arc-shaped cover plate can prevent the liquid phase from accumulating on it.

[0030] Preferably, the side wall of the second guide cylinder has an inclined portion that extends upward from its lower edge and gradually inclines toward the center, and a straight cylinder portion that extends vertically upward from the upper edge of the inclined portion. The lower edge of the inclined portion defines the lower open end of the second guide cylinder and is attached to the side wall of the tube box; the upper edge of the straight cylinder portion defines the upper open end of the second guide cylinder;

[0031] The liquid-phase outlet connection pipe is arranged corresponding to the inclined portion.

[0032] The inclined portion can ensure that all the tube-side medium output from the upper end of the heat exchange tube enters the second guide cylinder, and is conducive to the separated liquid phase collecting on the outside of the inclined portion and being output through the liquid-phase outlet connection pipe. The straight cylinder portion is conducive to the uniform distribution of the tube-side medium.

[0033] Compared with the prior art, the advantages of the present utility model are that the liquid-phase outlet connection pipe is arranged on the side wall of the lower part of the tube box, adjacent to the tube sheet.

[0034] During use, the liquid-phase medium output from the upper end of the heat exchange tube can be discharged through the liquid-phase outlet connection pipe, the gas-phase medium flows upward and undergoes gas-liquid separation by the gas-liquid separator. The separated liquid phase is discharged through the liquid-phase outlet connection pipe, and the separated gas phase flows upward and is discharged through the tube-side outlet connection pipe, thus achieving gas-liquid separation of the tube-side medium. Moreover, in the present utility model, the design of the first guide cylinder can be used to restrain the gas-liquid separator while also playing a guiding role, enabling the gas phase in the tube box to be collected into the first guide cylinder for gas-liquid separation, ensuring the gas-liquid separation effect. And because the first guide cylinder is relatively close to the tube-side outlet connection pipe and the flow area of the first guide cylinder in the cross-section is smaller than that of the tube box and larger than that of the tube-side outlet connection pipe, it can reduce the pressure loss generated when the gas phase in the tube box passes through the first guide cylinder.

[0035] Moreover, the first flow guide cylinder of the present utility model and the gas-liquid separator are designed by utilizing the space inside the tube sheet, which can effectively save the installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a partial structural schematic diagram of an embodiment of the present utility model;

[0037] Figure 2 is Figure 1 an enlarged view of part A in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The present utility model will be further described in detail below in conjunction with the embodiments of the drawings.

[0039] As Figure 1 and 2 shown, it is a preferred embodiment of a wound tube heat exchanger with a gas-liquid separator of the present utility model. The wound tube heat exchanger includes a shell side cylinder body 1, a tube sheet 2, heat exchange tubes 3, a second flow guide cylinder 4, a cover plate 5, a gas-liquid separator 6, a flow equalizing plate 7, and a first flow guide cylinder 8.

[0040] Among them, the shell side cylinder body 1 is arranged vertically, and a tube sheet 11 is provided at its upper end.

[0041] The above-mentioned tube sheet 2 is arranged on the tube sheet 11 and is formed by butting the upper and lower parts through a pair of second flanges and second flange bolts. A liquid phase outlet connecting pipe 21 for outputting the liquid phase medium is provided at a position adjacent to the tube sheet 11 on the side wall of the lower part 2b of the tube sheet 2, and a tube side outlet connecting pipe 22 for outputting the gas phase medium is provided on the top wall of the upper part 2a of the tube sheet 2.

[0042] The above-mentioned heat exchange tubes 3 are arranged axially in the shell side cylinder body 1 and are spirally wound from the inside to the outside into multiple layers of spiral tubes, and the upper ends of the heat exchange tubes 3 are supported on the tube sheet 11 and are communicated with the tube sheet 2.

[0043] The above-mentioned second flow guide cylinder 4 is arranged vertically in the tube sheet 2. A ring cavity 40 is formed between the side peripheral wall of the second flow guide cylinder 4 and the side wall of the tube sheet 2. The side peripheral wall of the second flow guide cylinder 4 has an inclined portion 41 that extends upward from its lower edge and gradually inclines toward the center, and a straight cylinder portion 42 that extends vertically upward from the upper edge of the inclined portion 41. The lower edge of the inclined portion 41 defines the lower end opening of the second flow guide cylinder 4 and is attached to the side wall of the tube sheet 2 to surround the periphery of the upper ends of the heat exchange tubes 3 so that the tube side medium output from the upper ends of the heat exchange tubes 3 can enter the second flow guide cylinder 4, and the inclined portion 41 is arranged corresponding to the liquid phase outlet connecting pipe 21 on the side wall of the tube sheet. The upper edge of the straight cylinder portion 42 defines the upper end opening of the second flow guide cylinder 4.

[0044] The above-mentioned cover plate 5 is located inside the tube box 2 and above the second guide cylinder 4. The upper plate surface of the cover plate 5 is arranged at an interval from the top wall of the tube box 2 to form an upper chamber 50. The lower plate surface of the cover plate 5 is spaced opposite to the upper open edge of the second guide cylinder 4 to form a gap 51, and the spacing distance is greater than the flow area of the tube-side outlet nozzle 22 in the cross-section, so as to reduce the pressure loss and at the same time make the annular chamber 40 communicate with the internal space of the second guide cylinder 4. The side edge of the cover plate 5 is located outside the upper open edge of the second guide cylinder 4 and is spaced opposite to the side wall of the tube box 2 to form an annular gap 52, and the annular gap 52 communicates the upper chamber 50 with the annular chamber 40. In this embodiment, the cover plate 5 has an upwardly arched arc-shaped structure with a high center and low sides, and the side edge of the cover plate 5 extends downward to form an annular side plate 53. The annular side plate 53 is connected to the side wall of the tube box 2 through ribs 54 (the ribs can be steel plates, profiled steels, steel pipes, etc.) arranged at intervals in the circumferential direction and extending radially.

[0045] The above-mentioned first guide cylinder 8 is vertically arranged in the upper chamber 50 and around the tube-side outlet nozzle 22. The upper opening edge of the first guide cylinder 8 is attached to and connected to the top wall of the tube box 2, and the lower opening edge is arranged at an interval from the upper plate surface of the cover plate 5. And the flow area of the first guide cylinder 8 in the cross-section is greater than the flow area of the tube-side outlet nozzle 22 and less than the flow area of the second guide cylinder 4. At the same time, in this embodiment, the first guide cylinder 8 is composed of an upper cylinder body 81 and a lower cylinder body 82 connected by a pair of first flanges and first flange bolts, and a first lug is provided circumferentially on the inner wall of the lower cylinder body 82 at a position relatively close to the first flange as a first component 821 for restraining the gas-liquid separator 6. A second lug is provided circumferentially on the inner wall of the lower cylinder body 82 at a position relatively far from the first flange as a second component 822 for restraining the flow equalizing plate 7.

[0046] The above-mentioned gas-liquid separator 6 is located inside the first guide cylinder 8 and placed on the first component 821, and is used for gas-liquid separation of the medium entering the first guide cylinder 8. Specifically, the gas-liquid separator 6 includes a plurality of vertically arranged separation plates 61. The plurality of separation plates 61 are arranged at intervals in the horizontal direction and block the inside of the first guide cylinder 8. A vertically through channel 610 is formed between the plate surfaces of two adjacent separation plates 61. The upper port of the channel 610 is used as the gas outlet of the gas-liquid separator 6 and is communicated with the tube-side outlet nozzle 22, and the lower port of the channel 610 is used as the liquid outlet of the gas-liquid separator 6 and is communicated with the upper chamber 50. And in this embodiment, each separation plate 61 has a wavy structure in the up and down directions, so that each channel 610 also has a wavy shape. The spacing distance between adjacent separation plates 61 is designed according to the actual working conditions, generally 10-95 mm (such as 10, 20, 50, 80, 95 mm, etc.), to ensure an effective gas-liquid separation effect.

[0047] The above flow equalizing plate 7 is horizontally arranged below the gas-liquid separator 6 inside the first guide cylinder 8, and is attached to the lower part of the second component 822 by welding. The flow equalizing plate 7 is evenly distributed with through holes penetrating the plate thickness, and the aperture of the through holes is 5-12 mm (such as 5, 7, 8, 10, 12 mm, etc.), and the distance between adjacent through holes is not greater than 50 mm, so that the medium before entering the gas-liquid separator can achieve uniform flow. At the same time, in this embodiment, the spacing distance between the flow equalizing plate 7 and the gas-liquid separator 6 is designed according to the design working conditions, so that the medium can flow to the gas-liquid separator 6 more evenly.

[0048] During use, the designs of the second guide cylinder 4 and the cover plate 5 can perform the first-stage gas-liquid separation on the tube-side medium output from the upper end of the heat exchange tube 3, so that the liquid phase can flow along the lower plate surface of the cover plate 5 into the annular cavity 40 and be output from the liquid-phase outlet connecting pipe 21. The gas phase can flow upward through the annular gap 52 into the upper chamber 50, and after being evenly distributed by the flow equalizing plate 7, it undergoes the second-stage gas-liquid separation in the gas-liquid separator 6. The gas phase after the second-stage gas-liquid separation is output from the tube-side outlet connecting pipe 22, and the liquid phase flows downward along the plate surface of the separation plate 61 and returns to the annular cavity 40 and is output from the liquid-phase outlet connecting pipe 21, thereby realizing the gas-liquid separation of the tube-side medium.

[0049] In order to realize the feeding of the tube-side medium, in this embodiment, the lower structure of the heat exchanger can be designed with reference to the prior art. For example, a lower tube sheet and a lower tube box are arranged at the lower end of the shell-side cylinder body, the lower end of the heat exchange tube is supported on the lower tube sheet and communicated with the lower tube box, and a tube-side inlet connecting pipe is provided on the lower tube box.

[0050] In order to realize the inlet and outlet of the shell-side medium, as in the prior art, a shell-side inlet connecting pipe and a shell-side outlet connecting pipe are respectively provided on the shell-side cylinder body in this embodiment.

[0051] Moreover, during heat exchange, even if a small amount of liquid phase drips from the lower plate surface of the cover plate 5 and returns to the heat exchange tube, it will be carried outside the second guide cylinder after being heated and vaporized by the shell-side medium.

Claims

1. A wound tube heat exchanger with a built-in gas-liquid separator, comprising: A shell-side cylinder (1) is arranged vertically, and a tube sheet (11) is provided at the upper end thereof; A pipe box (2) is arranged on the tube sheet (11), and a pipe outlet pipe (22) is arranged on the top wall of the pipe box (2); A heat exchange tube (3) is axially arranged in the shell-side cylinder (1) and spirally wound from the inside to the outside to form a multi-layer spiral tube, and the upper end of the heat exchange tube (3) is supported on the tube sheet (11) and is connected to the tube box (2); A gas-liquid separator (6) having a gas outlet for the separated gas phase to flow out upwards and a liquid outlet for the separated liquid phase to flow out downwards; Features Also included are: A first flow guide tube (8) is vertically arranged in the pipe box (2) and adjacent to the pipe outlet pipe (22), so that the gas-liquid separator (6) is arranged in the first flow guide tube (8) to separate the gas and liquid of the medium entering the first flow guide tube (8), and the upper opening edge of the first flow guide tube (8) is in contact with the top wall of the pipe box (2) and is located at the periphery of the pipe outlet pipe (22), and the lower opening edge of the first flow guide tube (8) is spaced from the upper plate surface of the tube sheet (11); and the flow area of ​​the first flow guide tube (8) in the cross section is smaller than the flow area of ​​the pipe box (2) and larger than the flow area of ​​the pipe outlet pipe (22); The liquid phase outlet pipe (21) is arranged on the side wall of the lower part of the pipe box (2) and adjacent to the tube sheet (11).

2. The wound tube heat exchanger according to claim 1, characterized in that: It also includes a flow equalizing plate (7) which is horizontally placed in the first flow guide tube (8) and below the gas-liquid separator (6), and the flow equalizing plate (7) is evenly distributed with through holes penetrating the thickness of the plate.

3. The wound tube heat exchanger according to claim 2, characterized in that: The first flow guide tube (8) is formed by an upper tube (81) and a lower tube (82) connected in a detachable manner, and the inner wall of the lower tube is provided with a first component (821) for restraining the gas-liquid separator (6) and a second component (822) for restraining the flow equalizing plate (7).

4. The wound tube heat exchanger according to claim 3, characterized in that: The upper cylinder (81) and the lower cylinder (82) are connected by a pair of first flanges and first flange bolts. A first lug is circumferentially provided on the inner wall of the lower cylinder (82) at a position relatively close to the first flange as the above-mentioned first component (821), so that the gas-liquid separator (6) can be placed on the first component (821); and a second lug is circumferentially provided on the inner wall of the lower cylinder (82) at a position relatively far from the first flange as the above-mentioned second component (822), so that the flow equalizing plate (7) can be attached to the bottom of the second component (822).

5. The wound tube heat exchanger according to claim 1, characterized in that: The gas-liquid separator (6) comprises a plurality of separation plates (61) arranged vertically, wherein the plurality of separation plates (61) are arranged at intervals in the horizontal direction, and a vertically penetrating channel (610) is formed between the plate surfaces of two adjacent separation plates (61), wherein the upper port of the channel (610) is the gas outlet of the gas-liquid separator (6), and the lower port of the channel (610) is the liquid outlet of the gas-liquid separator (6).

6. The wound tube heat exchanger according to claim 5, characterized in that: Each separation plate (61) has a wave-like structure in the up and down directions.

7. The wound tube heat exchanger according to any one of claims 1 to 6, characterized in that: The pipe box (2) is formed by connecting an upper and lower part via a pair of second flanges and second flange bolts; the pipe outlet pipe (22) and a first guide tube (8) equipped with a gas-liquid separator (6) are both arranged at the upper part (2a) of the pipe box (2); and the liquid phase outlet pipe (21) is arranged at the lower part (2b) of the pipe box (2).

8. The wound tube heat exchanger according to claim 7, characterized in that: Also included are: A second flow guide tube (4) is vertically arranged in the lower part (2b) of the tube box (2), and the side wall of the second flow guide tube (4) is spaced apart from the side wall of the lower part (2b) of the tube box to form an annular cavity (40). The lower end of the second flow guide tube (4) is open and arranged around the outer periphery of the upper end of the heat exchange tube (3), so that the tube-side medium output from the upper end of the heat exchange tube (3) can enter the second flow guide tube (4); A cover plate (5) is located in the lower part (2b) of the pipe box (2) and above the second guide tube (4), and the upper plate surface of the cover plate (5) is spaced from the lower opening edge of the first guide tube (8), and the space of the pipe box (2) above the cover plate (5) is referred to as an upper chamber (50), and the lower plate surface of the cover plate (5) is spaced from the upper opening edge of the second guide tube (4) to form a gap (51), so that the annular cavity (40) is connected to the internal space of the second guide tube (4), and the side edge of the cover plate (5) is located on the periphery of the upper opening edge of the second guide tube (4), and is spaced from the side wall of the pipe box (2) to form an annular gap (52), and the annular gap (52) connects the upper chamber (50) and the annular cavity (40); The liquid phase outlet pipe (21) is arranged corresponding to the lower part of the annular cavity (40).

9. The wound tube heat exchanger according to claim 8, characterized in that: The cover plate (5) is in an arc-shaped structure that is arched upward and is high in the middle and low on the sides.

10. The wound tube heat exchanger according to claim 8, characterized in that: The side circumferential wall of the second flow guide tube (4) comprises an inclined portion (41) which is inclined upward from its lower edge and gradually inclined toward the center, and a straight tube portion (42) which vertically extends upward from the upper edge of the inclined portion (41); the lower edge of the inclined portion (41) defines an open lower end of the second flow guide tube (4) and is in contact with the side wall of the pipe box (2); the upper edge of the straight tube portion (42) defines an open upper end of the second flow guide tube (4); The liquid phase outlet pipe (21) is arranged corresponding to the inclined portion (41).

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