Winding pipe type heat exchanger capable of achieving gas-liquid separation

Abstract

A winding pipe type heat exchanger capable of achieving gas-liquid separation comprises a shell pass barrel, a tube plate, a gas-liquid separator, a gas-liquid separator and a gas-liquid separator, the tube box is arranged on the tube plate; the upper end of the heat exchange tube is supported on the tube plate; the first guide cylinder is vertically arranged in the tube box, the side peripheral wall of the first guide cylinder is opposite to the side wall of the tube box at an interval to form an annular cavity, and the lower end opening of the first guide cylinder surrounds the periphery of the upper end of the heat exchange tube; the cover plate is located in the tube box and above the first guide cylinder, the upper plate surface of the cover plate and the top wall of the tube box are arranged at an interval to form an upper cavity, and the lower plate surface of the cover plate and the edge of the opening in the upper end of the first guide cylinder are opposite at an interval to form a gap; the side edge of the cover plate is located on the periphery of the edge of the opening in the upper end of the first guide cylinder and is opposite to the side wall of the tube box at intervals to form a circular seam. The liquid phase outlet connecting pipe is arranged on the side wall of the lower part of the pipe box; and the gas phase outlet connecting pipe is arranged on the top wall of the pipe box. The tube pass medium gas-liquid separation device can realize tube pass medium gas-liquid separation.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and particularly relates to a wound tube heat exchanger capable of gas-liquid separation. 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 Chinese invention patent "A Wound Tube Heat Exchanger for Gas Absorption" with patent number 201910358285.9 and authorization announcement number CN109999619B, Chinese utility model patent "A Wound Tube Heat Exchanger with Cleaning Structure" with patent number 202223107689.7 and authorization announcement number CN218846956U, etc. 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. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a wound tube heat exchanger capable of realizing gas-liquid separation of the tube-side medium in view of the current situation of the prior art.

[0006] The technical solution adopted by the utility model to solve the above technical problem is as follows: A wound tube heat exchanger capable of gas-liquid separation, comprising:

[0007] A vertically arranged shell-side cylinder body, the upper end of which is provided with a tube sheet;

[0008] A tube box, arranged on the tube sheet;

[0009] 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;

[0010] It is characterized in that it further comprises:

[0011] A first guide cylinder, vertically arranged in the tube box, and the side wall of the first guide cylinder is spaced relative to the side wall of the tube box to form an annular cavity. The lower end of the first 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 first guide cylinder;

[0012] The cover plate is located above the first guide cylinder inside the tube sheet. There is a space between the upper plate surface of the cover plate and the top wall of the tube sheet to form an upper chamber. The lower plate surface of the cover plate is spaced opposite to the upper open edge of the first guide cylinder to form a gap, so that the annular chamber is communicated with the inner space of the first guide cylinder. The side edge of the cover plate is located outside the upper open edge of the first guide cylinder and is spaced opposite to the side wall of the tube sheet to form an annular gap, and the annular gap communicates the upper chamber with the annular chamber;

[0013] The liquid phase outlet nozzle is arranged on the side wall at the lower part of the tube sheet to communicate with the annular chamber;

[0014] The gas phase outlet nozzle is arranged on the top wall of the tube sheet to communicate with the upper chamber.

[0015] In the present utility model, the design of the first guide cylinder and the cover plate can separate the gas-liquid of the tube-side medium output from the upper end of the heat exchange tube, so that the liquid phase can flow along the lower plate surface of the cover plate into the annular chamber and be output from the liquid phase outlet nozzle, and the gas phase can flow upward into the upper chamber and be output from the gas phase outlet nozzle, thereby realizing the gas-liquid separation of the tube-side medium. Moreover, the first guide cylinder and the cover plate of the present utility model utilize the space design inside the tube sheet, which can effectively save the installation space.

[0016] 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 chamber; 2. It can reduce the pressure loss and is beneficial 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.

[0017] More preferably, the side edge of the cover plate extends downward to form an annular side plate;

[0018] The annular side plate is connected to the side wall of the tube sheet through ribs arranged at intervals in the circumferential direction and extending radially.

[0019] In the above solution, preferably, the side peripheral wall of the first guide cylinder has an inclined portion that slopes upward from its lower edge and gradually toward the center. The lower edge of the inclined portion defines the lower open end of the first guide cylinder and is fitted with the side wall of the tube sheet;

[0020] The liquid phase outlet nozzle is arranged corresponding to the inclined portion.

[0021] The inclined portion can ensure that all the tube-side medium output from the upper end of the heat exchange tube enters the first guide cylinder, and is beneficial for the separated liquid phase to gather outside the inclined portion and be output from the liquid phase outlet nozzle.

[0022] Furthermore, the side peripheral wall of the first flow guide cylinder further has a straight cylinder portion extending vertically upward from the upper edge of the inclined portion, and the upper edge of the straight cylinder portion defines the upper end opening of the first flow guide cylinder.

[0023] The straight cylinder portion is beneficial to the uniform distribution of the tube-side medium.

[0024] In order to further improve the gas-liquid separation effect, preferably, a gas-liquid separator is further included, which is arranged below the gas-phase outlet connecting pipe in the upper chamber and is used for gas-liquid separation of the medium in the upper chamber. The gas outlet of the gas-liquid separator is communicated with the gas-phase outlet connecting pipe, and the liquid outlet of the gas separator is communicated with the upper chamber.

[0025] That is, the present utility model can perform two-stage separation on the tube-side medium, further improving the gas-liquid separation effect.

[0026] Furthermore, the gas-liquid separator includes a plurality of vertically arranged separation plates, and 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, and 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.

[0027] Preferably, each separation plate is in a wavy structure in the up and down directions.

[0028] Preferably, a flow equalizing plate is further included, which is horizontally arranged below the gas-liquid separator in the upper chamber, and through holes penetrating the plate thickness are uniformly distributed on the flow equalizing plate.

[0029] More preferably, a second flow guide cylinder is further included, which is vertically arranged in the upper chamber and around the gas-phase outlet connecting pipe, so that the gas-liquid separator and the flow equalizing plate are arranged in the second flow guide cylinder. The upper opening edge of the second flow guide cylinder is attached to the top wall of the tube box, and the lower opening edge is arranged at an interval from the upper plate surface of the cover plate;

[0030] At the same time, the flow area of the second flow guide cylinder in the cross section is larger than the flow area of the gas-phase outlet connecting pipe and smaller than the flow area of the first flow guide cylinder.

[0031] Compared with the prior art, the advantages of the present utility model are as follows: In the present utility model, the design of the first flow guide cylinder and the cover plate can perform gas-liquid separation on the tube-side medium output from the upper end of the heat exchange tube, so that the liquid phase can flow along the lower plate surface of the cover plate to the annular cavity and be output from the liquid-phase outlet connecting pipe, and the gas phase can flow upward into the upper chamber and be output from the gas-phase outlet connecting pipe, thereby realizing the gas-liquid separation of the tube-side medium. Moreover, the first flow guide cylinder and the cover plate of the present utility model utilize the space design in the tube box, which can effectively save the installation space. Description of the Drawings

[0032] Figure 1 Partial structural schematic diagram of an embodiment of the present utility model;

[0033] Figure 2 is Figure 1 An enlarged view of part A in Specific embodiments

[0034] The present utility model will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0035] As Figure 1 and 2 shown, a preferred embodiment of a wound tube heat exchanger capable of gas-liquid separation of the present utility model is provided. The wound tube heat exchanger includes a shell-side cylinder 1, a tube box 2, heat exchange tubes 3, a first guide cylinder 4, a cover plate 5, a gas-liquid separator 6, a flow equalizing plate 7, and a second guide cylinder 8.

[0036] The shell-side cylinder 1 is vertically arranged, and a tube sheet 11 is provided at its upper end.

[0037] The above-mentioned tube box 2 is arranged on the tube sheet 11. A liquid-phase outlet connection pipe 21 for outputting a liquid-phase medium is provided on the side wall of the lower part of the tube box 2, and a gas-phase outlet connection pipe 22 for outputting a gas-phase medium is provided on the top wall of the tube box 2.

[0038] The above-mentioned heat exchange tubes 3 are axially arranged in the shell-side cylinder 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 box 2.

[0039] The above-mentioned first guide cylinder 4 is vertically arranged in the tube box 2. A ring cavity 40 is formed between the side peripheral wall of the first guide cylinder 4 and the side wall of the tube box 2 at an interval. The side peripheral wall of the first guide cylinder 4 has an inclined part 41 that extends upward from its lower edge and gradually inclines toward the center, and a straight cylinder part 42 that extends vertically upward from the upper edge of the inclined part 41. The lower edge of the inclined part 41 defines the lower end opening of the first guide cylinder 4 and is attached to the side wall of the tube box 2 to surround the 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 first guide cylinder 4, and the inclined part 41 is arranged corresponding to the liquid-phase outlet connection pipe 21 on the side wall of the tube box. The upper edge of the straight cylinder part 42 defines the upper end opening of the first guide cylinder 4.

[0040] The above-mentioned cover plate 5 is located inside the tube box 2 and above the first 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 first guide cylinder 4 to form a gap 51, and the spacing distance is greater than the flow area of the gas-phase 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 first guide cylinder 4. The side edge of the cover plate 5 is located outside the upper open edge of the first 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 is in an arc-shaped structure that arches upward 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, section steels, steel pipes, etc.) arranged at intervals in the circumferential direction and extending radially.

[0041] The above-mentioned second guide cylinder 8 is vertically arranged in the upper chamber 50 and outside the gas-phase outlet nozzle 22. The upper opening edge of the second guide cylinder 8 is in contact with 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 second guide cylinder 8 in the cross-section is greater than the flow area of the gas-phase outlet nozzle 22 and less than the flow area of the first guide cylinder 4.

[0042] The above-mentioned gas-liquid separator 6 is arranged in the second guide cylinder 8 and is used for gas-liquid separation of the medium entering the second 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 second 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 serves as the gas outlet of the gas-liquid separator 6 and is communicated with the gas-phase outlet nozzle 22, and the lower port of the channel 610 serves 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 is in a wavy structure in the up-down direction, so that each channel 610 is also in 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.

[0043] The above-mentioned flow equalizing plate 7 is horizontally arranged in the second guide cylinder 8 and below the gas-liquid separator 6, and through holes penetrating the plate thickness are uniformly distributed on the flow equalizing plate 7. The aperture of the through holes is 5-12 mm (such as 5, 7, 8, 10, 12 mm, etc.), and the spacing between adjacent through holes is not greater than 50 mm, so that the medium before entering the gas-liquid separator can achieve flow equalization. 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 uniformly.

[0044] During use, the design of the first draft tube 4 and the cover plate 5 can perform the first gas-liquid separation on the tube-side medium output from the upper end of the heat exchange tube 3, enabling the liquid phase to flow along the lower plate surface of the cover plate 5 into the annular cavity 40 and be output through 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 gas-liquid separation in the gas-liquid separator 6. The gas phase after the second gas-liquid separation is output through the gas-phase 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 to be output through the liquid-phase outlet connecting pipe 21, thereby achieving the gas-liquid separation of the tube-side medium.

[0045] To achieve the feeding of the tube-side medium, the lower structure of the heat exchanger in this embodiment can be designed with reference to the prior art. For example, a lower tube sheet and a lower tube box are provided 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 communicates with the lower tube box, and a tube-side inlet connecting pipe is provided on the lower tube box.

[0046] To achieve 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.

[0047] 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 first draft tube after being heated and vaporized by the shell-side medium.

Claims

1. A wound tube heat exchanger capable of gas-liquid separation, comprising: A shell-side cylinder (1) is arranged vertically, and a tube sheet (11) is provided at the upper end thereof; A tube box (2) is arranged on the tube sheet (11); 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); Features Also included are: A first flow guide tube (4) is vertically arranged in the tube box (2), and the side wall of the first flow guide tube (4) is spaced apart from the side wall of the tube box (2) to form an annular cavity (40). The lower end of the first 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 first flow guide tube (4); A cover plate (5) is located inside the pipe box (2) and above the first flow guide cylinder (4), and the upper plate surface of the cover plate (5) is spaced apart from the top wall of the pipe box (2) to form an upper chamber (50), and the lower plate surface of the cover plate (5) is spaced apart from the upper open edge of the first flow guide cylinder (4) to form a gap (51), so that the annular cavity (40) is connected with the internal space of the first flow guide cylinder (4), and the side edge of the cover plate (5) is located outside the upper open edge of the first flow guide cylinder (4) and is spaced apart 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) with the annular cavity (40); A liquid phase outlet pipe (21) is arranged on the side wall of the lower part of the pipe box (2) to communicate with the annular cavity (40); A gas phase outlet pipe (22) is arranged on the top wall of the pipe box (2) to communicate with the upper chamber (50).

2. The wound tube heat exchanger according to claim 1, 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.

3. The wound tube heat exchanger according to claim 2, characterized in that: 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 pipe box (2) via ribs (54) which are arranged at intervals in the circumferential direction and extend radially.

4. The wound tube heat exchanger according to claim 1, characterized in that: The side peripheral wall of the first flow guide tube (4) has an inclined portion (41) which is inclined upward from its lower edge and gradually inclined toward the center, and the lower edge of the inclined portion (41) defines the lower end opening of the first flow guide tube (4) and fits with the side wall of the pipe box (2); The liquid phase outlet pipe (21) is arranged corresponding to the inclined portion (41).

5. The wound tube heat exchanger according to claim 4, characterized in that: The side peripheral wall of the first flow guide cylinder (4) also has a straight tube portion (42) extending vertically upward from the upper edge of the inclined portion (41), and the upper edge of the straight tube portion (42) defines an upper end opening of the first flow guide cylinder (4).

6. The wound tube heat exchanger according to any one of claims 1 to 5, characterized in that: It also includes a gas-liquid separator (6), which is arranged in the upper chamber (50) and below the gas phase outlet pipe (22) and is used to separate the gas and liquid in the medium in the upper chamber (50), and the gas outlet of the gas-liquid separator (6) is connected to the gas phase outlet pipe (22), and the liquid outlet of the gas separator is connected to the upper chamber (50).

7. The wound tube heat exchanger according to claim 6, 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).

8. The wound tube heat exchanger according to claim 7, characterized in that: Each separation plate (61) has a wave-like structure in the up and down directions.

9. The wound tube heat exchanger according to claim 7, characterized in that: It also includes a flow balancing plate (7) which is horizontally placed in the upper chamber (50) and below the gas-liquid separator (6), and the flow balancing plate (7) is evenly distributed with through holes penetrating the thickness of the plate.

10. The wound tube heat exchanger according to claim 9, characterized in that: It also includes a second flow guide tube (8) which is vertically arranged in the upper chamber (50) and the periphery of the gas phase outlet pipe (22) so that the gas-liquid separator (6) and the flow equalizing plate (7) are arranged in the second flow guide tube (8), and the upper opening edge of the second flow guide tube (8) is in contact with the top wall of the pipe box (2), and the lower opening edge is spaced apart from the upper plate surface of the cover plate (5); At the same time, the flow area of ​​the second flow guide tube (8) in the cross section is larger than the flow area of ​​the gas phase outlet pipe (22) and smaller than the flow area of ​​the first flow guide tube (4).

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