Double-flow combined type heat exchanger

Abstract

The utility model discloses a double-flow combined type heat exchanger, which belongs to the technical field of heat exchangers, and comprises a shell and a central cylinder, one axial end of the central cylinder is connected with a first tube plate, and one end of the first tube plate back to the central cylinder is provided with a first tube box; a second tube plate is arranged at one end, away from the first tube box, of the shell; a second tube box is arranged at one end, back to the shell, of the second tube plate; the other axial end of the central cylinder penetrates through the second tube plate and the second tube box and then is connected with a tube opening of the first tube pass; a third tube plate is arranged at one end of the central cylinder close to the first tube pass orifice; a plurality of internal heat exchange tubes are arranged in the center cylinder, one end of each internal heat exchange tube penetrates through the third tube plate and then communicates with the first tube pass tube opening, and the other end of each internal heat exchange tube penetrates through the first tube plate and then communicates with the first tube box; a winding pipe is arranged in the shell, and the two ends of the winding pipe fixedly penetrate through the first pipe plate and the second pipe plate. The inner space of the central cylinder of the coiled tube type heat exchanger is fully utilized, the heat exchange area is increased, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger technology, specifically relating to a dual-flow composite heat exchanger. Background Technology

[0002] Winded-tube heat exchangers are widely used in industries such as chemical, petroleum, power, and pharmaceutical due to their advantages of high efficiency, compact structure, and ease of maintenance. They consist of a shell and a central tube located inside the shell, with several tubes spirally wound around the central tube arranged in the space between the shell and the central tube. The central tube in the wound-tube heat exchanger serves to support, guide airflow, and facilitate installation; however, it occupies a portion of the shell's space, resulting in inefficient use of its internal space and thus affecting heat exchange efficiency. Utility Model Content

[0003] To address the problem of ineffective utilization of the internal space of the central tube in existing wound-tube heat exchangers, this invention proposes a dual-flow composite heat exchanger.

[0004] A dual-pass composite heat exchanger includes a shell and a central cylinder coaxially disposed inside the shell. One axial end of the central cylinder is fixedly connected to a first tube sheet, and a first tube box is fixedly disposed at the end of the first tube sheet facing away from the central cylinder. A second tube sheet is fixedly disposed at the end of the shell away from the first tube box, and a second tube box is fixedly disposed at the end of the second tube sheet facing away from the shell. The other axial end of the central cylinder passes through the second tube sheet and the second tube box and is connected to the inlet of the first tube pass.

[0005] The third tube sheet is vertically fixed at one end of the central tube near the inlet of the first tube pass.

[0006] The central tube is provided with several internal heat exchange tubes. One end of each internal heat exchange tube passes through the third tube sheet and is connected to the opening of the first tube pass. The other end of each internal heat exchange tube passes through the first tube sheet and is connected to the first tube box.

[0007] The housing contains several spirally wound tubes that are wound around the central cylinder, with both ends of the spirally wound tubes fixedly passing through the first tube sheet and the second tube sheet, respectively.

[0008] The shell is provided with a first shell-side port, the central cylinder is provided with a second shell-side port that communicates with the inner cavity of the shell at one end near the first tube box, and a third shell-side port is provided on the side wall of the central cylinder extending out of the second tube box.

[0009] The second pipe box is equipped with a second pipe pass port.

[0010] Preferably, the internal heat exchange tube is a straight tube extending along the axial direction of the central cylinder.

[0011] Preferably, the central cylinder is provided with a baffle assembly to increase the movement path of the medium within the central cylinder.

[0012] Preferably, the deflector assembly includes a first deflector and a second deflector disposed opposite to each other;

[0013] The first baffle includes a plurality of first baffle plates evenly arranged along the axial direction of the central cylinder. The first baffle plates are perpendicular to the central axis of the central cylinder. The radial outer end face of the first baffle plate includes a first arc-shaped end face and a first straight end face that are connected. The first arc-shaped end face is fixedly connected to the inner wall surface of the central cylinder.

[0014] The second baffle includes a plurality of second baffle plates evenly arranged along the axial direction of the central cylinder. The second baffle plates are perpendicular to the central axis of the central cylinder. The radial outer end face of the second baffle plate includes a second arc-shaped end face and a second straight end face that are connected to each other. The second arc-shaped end face is fixedly connected to the inner wall surface of the central cylinder.

[0015] The first baffle and the second baffle are arranged alternately, and the first baffle and the second baffle are provided with straight pipe through holes for straight pipes to pass through;

[0016] The vertical distance from the center point of the first straight end face of the first baffle to the first arc-shaped end face is L1, and the vertical distance from the center point of the second straight end face of the second baffle to the second arc-shaped end face is L2. The sum of L1 and L2 is greater than the internal diameter of the central cylinder.

[0017] Preferably, the first straight end face and the second straight end face of the deflector assembly are arranged in parallel.

[0018] The vertical distance L1 between the center point of the first straight end face of the first baffle and the first arc-shaped end face is equal to the vertical distance L2 between the center point of the second straight end face of the second baffle and the second arc-shaped end face.

[0019] Preferably, the internal heat exchange tube has a spiral wound structure.

[0020] Preferably, the first shell-side port is located at the end of the shell away from the first tube box;

[0021] The shell is provided with shell end caps at both ends, and the second tube sheet is fixedly installed at the center of the corresponding shell end cap.

[0022] Preferably, the first tube box is located outside the shell, and the first tube sheet is fixedly disposed at the center of the corresponding shell end cap.

[0023] Preferably, the first tube box is located inside the housing.

[0024] Preferably, the shell end cap to which the second tube sheet is fixed is connected to the shell via a flange.

[0025] The beneficial effects of this utility model are:

[0026] (1) In this utility model, the shell, the central cylinder and the coiled tube form a coiled tube heat exchanger. When the internal heat exchange tube in the central cylinder is a straight tube, the central cylinder and the internal straight tube form a shell-and-tube heat exchanger. That is, the central cylinder of the coiled tube heat exchanger also serves as the shell of the built-in shell-and-tube heat exchanger, thereby making full use of the internal space of the central cylinder of the coiled tube heat exchanger, increasing the heat exchange area and improving the heat exchange efficiency. When the internal heat exchange tube in the central cylinder is a spiral coiled tube structure, the central cylinder and the internal spiral coiled tube form a built-in second coiled tube heat exchanger. That is, the central cylinder of the coiled tube heat exchanger also serves as the shell of the built-in second coiled tube heat exchanger, thereby making full use of the internal space of the central cylinder of the coiled tube heat exchanger, increasing the heat exchange area and improving the heat exchange efficiency.

[0027] (2) In this utility model, the straight tube is located inside the central tube. Since the straight tube has a strengthening effect on the strength of the central tube, the thickness of the central tube can be reduced, thus reducing the manufacturing cost.

[0028] (3) In this utility model, when the first tube box and the first tube sheet are both located inside the shell, the influence of the temperature difference between the shell and the central cylinder is reduced, and the internal stress of the temperature difference between the shell and the central cylinder is eliminated.

[0029] (4) In this utility model, the shell end cap fixed to the second tube sheet is connected to the shell through a flange, thereby forming a detachable structure. The tube bundle as a whole is a detachable structure, which increases the convenience of maintenance and repair, and facilitates internal maintenance, cleaning and upkeep. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0031] Figure 1 A schematic diagram of the dual-flow composite heat exchanger in Embodiment 1 of this utility model;

[0032] Figure 2 A schematic diagram of the dual-flow composite heat exchanger in Embodiment 2 of this utility model;

[0033] Figure 3 A schematic diagram of the dual-flow composite heat exchanger in Embodiment 3 of this utility model;

[0034] Figure 4 A schematic diagram of the structure of the first baffle plate in this utility model;

[0035] Figure 5A schematic diagram of the structure of the second baffle plate in this utility model;

[0036] in:

[0037] 1-Shell, 101-Shell head, 2-Central cylinder, 3-First tube sheet, 4-First tube box, 5-Second tube sheet, 6-Second tube box, 7-First tube side nozzle, 8-Third tube sheet, 9-Straight tube, 10-Wrapped tube, 11-First shell side nozzle, 12-Second shell side nozzle, 13-Third shell side nozzle, 14-Second tube side nozzle, 15-First baffle, 151-First arc-shaped end face, 152-First straight end face, 16-Second baffle, 161-Second arc-shaped end face, 162-Second straight end face, 17-Flange, 18-Straight tube through hole. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1:

[0040] like Figure 1 As shown, a dual-pass composite heat exchanger includes a housing 1 and a central cylinder 2 coaxially disposed inside the housing 1. One axial end of the central cylinder 2 is fixedly connected to a first tube sheet 3, and a first tube box 4 is fixedly disposed at the end of the first tube sheet 3 facing away from the central cylinder 2. A second tube sheet 5 is fixedly disposed at the end of the housing 1 away from the first tube box 4, and a second tube box 6 is fixedly disposed at the end of the second tube sheet 5 facing away from the housing 1. The other axial end of the central cylinder 2 passes through the second tube sheet 5 and the second tube box 6 and is connected to the first tube pass port 7.

[0041] The third tube sheet 8 is vertically fixed at one end of the central tube 2 near the first tube opening 7.

[0042] The central cylinder 2 is provided with a plurality of internal heat exchange tubes. One end of the internal heat exchange tube is fixedly passed through the third tube sheet 8 and connected to the first tube opening 7. The other end of the internal heat exchange tube is fixedly passed through the first tube sheet 3 and connected to the first tube box 4.

[0043] The housing 1 is provided with a plurality of spirally wound tubes 10 that are spirally wound around the central cylinder 2. The two ends of the spiral tubes 10 are respectively fixed through the first tube plate 3 and the second tube plate 5.

[0044] The housing 1 is provided with a first shell-side port 11, the central cylinder 2 is provided with a second shell-side port 12 that communicates with the inner cavity of the housing 1 at one end near the first tube box 4, and a third shell-side port 13 is provided on the side wall of the central cylinder 2 extending out of the second tube box 6.

[0045] The second pipe box 6 is provided with a second pipe port 14.

[0046] Preferably, the internal heat exchange tube is a straight tube 9 extending along the axial direction of the central cylinder 2.

[0047] Preferably, when the internal heat exchange tube is a straight tube 9 extending along the axial direction of the central cylinder 2, a baffle assembly is provided inside the central cylinder 2 to increase the movement path of the medium inside the central cylinder 2.

[0048] Preferably, the deflector assembly includes a first deflector and a second deflector disposed opposite to each other;

[0049] The first baffle includes a plurality of first baffle plates 15 evenly arranged along the axial direction of the central cylinder 2. The first baffle plates 15 are perpendicular to the central axis of the central cylinder 2. Figure 4 As shown, the radial outer end face of the first baffle 15 includes a first arc-shaped end face 151 and a first straight end face 152 that are in contact with each other. The first arc-shaped end face 151 is fixedly connected to the inner wall surface of the central cylinder 2.

[0050] The second baffle includes a plurality of second baffle plates 16 evenly arranged along the axial direction of the central cylinder 2. The second baffle plates 16 are perpendicular to the central axis of the central cylinder 2. Figure 5 As shown, the radial outer end face of the second baffle 16 includes a second arc-shaped end face 161 and a second straight end face 162 that are in contact with each other. The second arc-shaped end face 161 is fixedly connected to the inner wall surface of the central cylinder 2.

[0051] The first baffle plate 15 and the second baffle plate 16 are arranged alternately to form an S-shaped bend path. The first baffle plate 15 and the second baffle plate 16 are provided with straight pipe through holes 18 for the straight pipe 9 to pass through.

[0052] The vertical distance between the center point of the first straight end face 152 of the first baffle 15 and the first arc-shaped end face 151 is L1, and the vertical distance between the center point of the second straight end face 162 of the second baffle 16 and the second arc-shaped end face 161 is L2. The sum of L1 and L2 is greater than the internal diameter of the central cylinder 2.

[0053] Preferably, the first straight end face 152 and the second straight end face 162 in the deflector assembly are arranged in parallel.

[0054] The vertical distance L1 between the center point of the first straight end face 152 in the first baffle 15 and the first arc-shaped end face 151 is equal to the vertical distance L2 between the center point of the second straight end face 162 in the second baffle 16 and the second arc-shaped end face 161.

[0055] Preferably, the internal heat exchange tube is a spiral wound tube structure. The internal heat exchange tube shown in the accompanying drawings is a straight tube 9. When the internal heat exchange tube is a spiral wound tube, the spiral wound tube structure is the prior art and will not be described in detail here.

[0056] Preferably, the first shell-side port 11 is located at the end of the shell 1 away from the first tube box 4.

[0057] Preferably, shell end caps 101 are provided at both ends of the shell 1, and the second tube sheet 5 is fixedly disposed at the center of the corresponding shell end cap 101.

[0058] Preferably, the first tube box 4 is located outside the housing 1, and the first tube plate 3 is fixedly disposed at the center of the corresponding housing end cap 101.

[0059] Example 2:

[0060] Unlike in Example 1, as Figure 2 As shown, the first tube box 4 is located inside the shell 1, that is, the first tube box 4 and the first tube sheet 3 are both located inside the shell 1. At this time, the first tube sheet 3 is in a floating head style, and the internal stress of temperature difference between the shell 1 and the central cylinder 2 is eliminated.

[0061] Example 3:

[0062] Based on Example 2, such as Figure 3 As shown, the shell end cap 101 fixed to the second tube sheet 5 is connected to the shell 1 through a flange 17, thus forming a detachable structure. The tube bundle as a whole is a detachable structure, which increases the convenience of maintenance and repair, and facilitates internal maintenance, cleaning and upkeep.

[0063] The dual-flow composite heat exchanger in Example 1, Example 2, or Example 3 is illustrated using the example of a first shell-side inlet 11, a third shell-side outlet 13, a first tube-side inlet 7, and a second tube-side outlet 14. The shell-side medium enters the shell 1 through the first shell-side inlet 11, flows past the outer wall of the coiled tube 10, and then enters the central cylinder 2 through the second shell-side inlet 12. When the internal heat exchange tubes are straight tubes 9, the shell-side medium entering the central cylinder 2 flows past the outer wall of the straight tube 9 and is deflected by the baffle assembly. Under the influence of the flow, the medium flows out through the third shell-side port 13. When the internal heat exchange tube is a spiral wound tube structure, the shell-side medium entering the central cylinder 2 flows through the outer wall of the spiral wound tube and is subjected to its spiral turbulence and flows out through the third shell-side port 13. The tube-side medium enters the internal heat exchange tube through the first tube-side port 7 and exchanges heat with the shell-side fluid in the central cylinder 2. Then it enters the wound tube 10 through the first tube box 4 and exchanges heat with the shell-side fluid in the shell 1 again before entering the second tube box 6. Finally, it flows out through the second tube-side port 14, completing the dual-flow heat exchange.

[0064] In this application, the shell 1, the central cylinder 2, and the coiled tube 10 form a coiled tube heat exchanger. When the internal heat exchange tubes inside the central cylinder 2 are straight tubes 9, the central cylinder 2 and the internal straight tubes 9 form a shell-and-tube heat exchanger. That is, the central cylinder 2 of the coiled tube heat exchanger also serves as the shell of the built-in shell-and-tube heat exchanger, thereby making full use of the internal space of the central cylinder of the coiled tube heat exchanger, increasing the heat exchange area, and improving the heat exchange efficiency. When the internal heat exchange tubes inside the central cylinder 2 are spiral coiled tubes, the central cylinder 2 and the internal spiral coiled tubes form a built-in second coiled tube heat exchanger. That is, the central cylinder 2 of the coiled tube heat exchanger also serves as the shell of the built-in second coiled tube heat exchanger, thereby making full use of the internal space of the central cylinder of the coiled tube heat exchanger, increasing the heat exchange area, and improving the heat exchange efficiency.

[0065] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, they are not intended to limit the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the protection scope of the present utility model.

Claims

1. A dual-flow composite heat exchanger, comprising a shell (1) and a central cylinder (2) coaxially disposed inside the shell (1), characterized in that, One axial end of the central cylinder (2) is fixedly connected to the first tube sheet (3), and the first tube box (4) is fixedly installed at the end of the first tube sheet (3) facing away from the central cylinder (2); the second tube sheet (5) is fixedly installed at the end of the shell (1) away from the first tube box (4), and the second tube box (6) is fixedly installed at the end of the second tube sheet (5) facing away from the shell (1); the other axial end of the central cylinder (2) passes through the second tube sheet (5) and the second tube box (6) and is connected to the first tube end (7); The third tube sheet (8) is vertically fixed at one end of the central tube (2) near the first tube opening (7); The central tube (2) is provided with several internal heat exchange tubes. One end of the internal heat exchange tube is fixedly passed through the third tube sheet (8) and connected to the first tube side opening (7). The other end of the internal heat exchange tube is fixedly passed through the first tube sheet (3) and connected to the first tube box (4). The housing (1) is provided with a plurality of spiral tubes (10) that are spirally wound around the central cylinder (2), and the two ends of the spiral tubes (10) are respectively fixed through the first tube plate (3) and the second tube plate (5); The shell (1) is provided with a first shell-side port (11), the center cylinder (2) is provided with a second shell-side port (12) that communicates with the inner cavity of the shell (1) at one end near the first tube box (4), and the center cylinder (2) is provided with a third shell-side port (13) on the side wall extending out of the second tube box (6). The second pipe box (6) is provided with a second pipe port (14).

2. The dual-flow composite heat exchanger as described in claim 1, characterized in that, The internal heat exchange tube is a straight tube (9) extending along the axial direction of the central cylinder (2).

3. The dual-flow composite heat exchanger as described in claim 2, characterized in that, The central cylinder (2) is provided with a flow deflector assembly to increase the movement path of the medium inside the central cylinder (2).

4. The dual-flow composite heat exchanger as described in claim 3, characterized in that, The flow deflector assembly includes a first flow deflector and a second flow deflector disposed opposite to each other; The first baffle includes a plurality of first baffle plates (15) evenly arranged along the axial direction of the central cylinder (2). The first baffle plates (15) are perpendicular to the central axis of the central cylinder (2). The radial outer end face of the first baffle plate (15) includes a first arc-shaped end face (151) and a first straight end face (152) that are connected to each other. The first arc-shaped end face (151) is fixedly connected to the inner wall surface of the central cylinder (2). The second baffle includes a plurality of second baffle plates (16) evenly arranged along the axial direction of the central cylinder (2). The second baffle plates (16) are perpendicular to the central axis of the central cylinder (2). The radial outer end face of the second baffle plate (16) includes a second arc-shaped end face (161) and a second straight end face (162) that are connected to each other. The second arc-shaped end face (161) is fixedly connected to the inner wall surface of the central cylinder (2). The first baffle (15) and the second baffle (16) are arranged alternately, and the first baffle (15) and the second baffle (16) are provided with straight pipe through holes (18) for the straight pipe (9) to pass through; The vertical distance between the center point of the first straight end face (152) of the first baffle (15) and the first arc-shaped end face (151) is L1, and the vertical distance between the center point of the second straight end face (162) of the second baffle (16) and the second arc-shaped end face (161) is L2. The sum of L1 and L2 is greater than the internal diameter of the central cylinder (2).

5. The dual-flow composite heat exchanger as described in claim 4, characterized in that, The first straight end face (152) and the second straight end face (162) of the deflector assembly are arranged in parallel. The vertical distance L1 between the center point of the first straight end face (152) of the first baffle (15) and the first arc-shaped end face (151) is equal to the vertical distance L2 between the center point of the second straight end face (162) of the second baffle (16) and the second arc-shaped end face (161).

6. The dual-flow composite heat exchanger as described in claim 1, characterized in that, The internal heat exchange tubes have a spiral wound structure.

7. The dual-flow composite heat exchanger as described in claim 1, characterized in that, The first shell-side port (11) is located at the end of the shell (1) away from the first tube box (4); The shell (1) is provided with shell end caps (101) at both ends, and the second tube sheet (5) is fixedly disposed at the center of the corresponding shell end caps (101).

8. The dual-flow composite heat exchanger as described in claim 7, characterized in that, The first tube box (4) is located outside the shell (1), and the first tube sheet (3) is fixedly installed at the center of the corresponding shell end cap (101).

9. The dual-flow composite heat exchanger as described in claim 7, characterized in that, The first tube box (4) is located inside the shell (1).

10. The dual-flow composite heat exchanger as described in claim 9, characterized in that, The shell end cap (101) fixed to the second tube sheet (5) is connected to the shell (1) via a flange (17).

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