Vertical heat exchanger

Abstract

The utility model belongs to the technical field of structural improvement of vertical heat exchangers, and particularly relates to a vertical heat exchanger which comprises a skirt, a tube box fixedly connected to the top of the skirt, a barrel fixedly connected to the upper portion of the tube box, a shell pass fluid inlet and a shell pass fluid outlet formed in the barrel, and a plurality of baffle plates fixedly connected to the interior of the barrel. An upper tube plate is connected between the barrel and the tube box, a plurality of outer heat exchange tubes are fixedly connected to the upper tube plate, the upper ends of the outer heat exchange tubes are closed and penetrate through the corresponding baffle plates, the lower ends of the outer heat exchange tubes are opened and penetrate through the upper tube plate, and a tube pass fluid outlet and a tube pass fluid inlet are formed in the tube box. A lower tube plate located between the tube pass fluid outlet and the tube pass fluid inlet is fixedly connected into the tube box, an inner heat exchange tube is fixedly connected to the lower tube plate, the upper end of the inner heat exchange tube extends to the upper end of the inner side of the outer heat exchange tube, and the lower end of the inner heat exchange tube penetrates through the lower tube plate. According to the utility model, the flow area of tube pass fluid is greatly increased, so that the heat exchange efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to a vertical heat exchanger, belonging to the technical field of vertical heat exchanger structure improvement. Background Art

[0002] Vertical heat exchangers are widely used heat exchange equipment in industries such as chemical, petroleum, metallurgy, and light industry. Their main purpose is to transfer heat from one fluid to another through conduction, convection, and radiation. Vertical heat exchangers are widely used in chemical production processes such as distillation, absorption, extraction, and hydrogenation due to their advantages of simple structure, high heat exchange efficiency, strong adaptability, and small footprint. However, existing vertical heat exchangers also suffer from the disadvantage of a small tube-side fluid flow area. For example, Chinese utility model patent CN209431921U discloses a vertical shell-and-tube flexible tube sheet heat exchanger where the tube-side fluid flow area is only the entire heat exchange tube, resulting in low heat exchange efficiency. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a vertical heat exchanger with high heat exchange efficiency.

[0004] The vertical heat exchanger of this utility model includes a skirt base, a tube box fixedly connected to the top of the skirt base, a cylinder fixedly connected above the tube box, a shell-side fluid inlet and a shell-side fluid outlet on the cylinder, multiple baffles fixedly connected inside the cylinder, through holes on the baffles, an upper tube sheet connected between the cylinder and the tube box, multiple external heat exchange tubes fixedly connected to the upper tube sheet, the upper end of the external heat exchange tubes being closed and passing through the through holes on their corresponding baffles, the lower end of the external heat exchange tubes being open and passing through the upper tube sheet and communicating with the tube box, the tube box having tube-side fluid outlets and tube-side fluid inlets distributed vertically, a lower tube sheet fixedly connected inside the tube box between the tube-side fluid outlets and tube-side fluid inlets, an inner heat exchange tube fixedly connected to the lower tube sheet corresponding to the external heat exchange tubes, the upper end of the inner heat exchange tubes extending to the upper inner side of the external heat exchange tubes, and the lower end of the inner heat exchange tubes passing through the lower tube sheet.

[0005] Furthermore, the pipe box is provided with a lower flange, and the cylinder is provided with an upper flange. The upper flange and the lower flange are fixedly connected by bolts.

[0006] Furthermore, the top of the external heat exchange tube is provided with a first chamfer.

[0007] Furthermore, the upper inner end of the external heat exchange tube is connected to a tube positioning structure that can position the upper end of the internal heat exchange tube.

[0008] Furthermore, the pipe positioning structure includes an outer connecting ring and an inner connecting ring. The outer diameter of the outer connecting ring is adapted to the inner diameter of the outer heat exchange tube, and the inner diameter of the inner connecting ring is adapted to the outer diameter of the inner heat exchange tube. The outer connecting ring and the inner connecting ring are fixedly connected by multiple connecting ribs.

[0009] Furthermore, the upper end of the internal heat exchange tube is provided with a second chamfer.

[0010] The advantages of this utility model compared with the prior art are:

[0011] The vertical heat exchanger of this invention, by setting an inner heat exchange tube inside the outer heat exchange tube, allows the tube-side fluid flowing in from the tube-side fluid inlet to flow through the inner heat exchange tube to the uppermost end of the outer heat exchange tube, and then through the outer heat exchange tube to the tube-side fluid outlet, which greatly increases the flow area of ​​the tube-side fluid and thus effectively improves the heat exchange efficiency. Attached Figure Description

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle;

[0014] Figure 3 yes Figure 2 Sectional view at point BB.

[0015] In the diagram: 1. Skirt; 2. Tube box; 3. Tube-side fluid inlet; 4. Lower tube sheet; 5. Tube-side fluid outlet; 6. Lower flange; 7. Upper tube sheet; 8. Upper flange; 9. Inner heat exchanger tube; 10. Shell-side fluid inlet; 11. Outer heat exchanger tube; 12. Baffle plate; 13. Shell; 14. Shell-side fluid outlet; 15. First chamfer; 16. Outer connecting ring; 17. Inner connecting ring; 18. Connecting rib; 19. Second chamfer. Detailed Implementation

[0016] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0017] Example 1:

[0018] like Figure 1As shown, the vertical heat exchanger of this utility model includes a skirt 1, a tube box 2 fixedly connected to the top of the skirt 1, a cylinder 13 fixedly connected above the tube box 2, a shell-side fluid inlet 10 and a shell-side fluid outlet 14 on the cylinder 13, a plurality of baffles 12 fixedly connected inside the cylinder 13, the baffles 12 having through holes, an upper tube sheet 7 connecting the cylinder 13 and the tube box 2, a plurality of external heat exchange tubes 11 fixedly connected to the upper tube sheet 7, the upper end of the external heat exchange tubes 11 being closed and penetrating through it. The corresponding through hole on the baffle plate 12 opens at the lower end of the external heat exchange tube 11 and passes through the upper tube sheet 7 to communicate with the tube box 2. The tube box 2 is provided with tube-side fluid outlet 5 and tube-side fluid inlet 3 distributed vertically. The tube box 2 is fixedly connected with a lower tube sheet 4 located between the tube-side fluid outlet 5 and the tube-side fluid inlet 3. The lower tube sheet 4 is fixedly connected with an inner heat exchange tube 9 corresponding to the external heat exchange tube 11. The upper end of the inner heat exchange tube 9 extends to the upper inner side of the external heat exchange tube 11, and the lower end of the inner heat exchange tube 9 passes through the lower tube sheet 4.

[0019] In use, the shell-side fluid flows into the shell body 13 through the shell-side fluid inlet 10, and after being deflected by the baffle plate 12, it flows out through the shell-side fluid outlet 14. The tube-side fluid flows into the tube box 2 through the tube-side fluid inlet 3, and then flows through the inner heat exchange tube 9 to the uppermost end of the outer heat exchange tube 11. Then it flows back to the tube box 2 through the outer heat exchange tube 11 and flows out through the tube-side fluid outlet 5. When the tube-side fluid flows to the inside of the shell body 13, it exchanges heat with the shell-side fluid inside the shell body 13.

[0020] The vertical heat exchanger of this utility model, by setting an inner heat exchange tube 9 inside the outer heat exchange tube 11, allows the tube-side fluid flowing in from the tube-side fluid inlet 3 to flow through the inner heat exchange tube 9 to the uppermost end of the outer heat exchange tube 11, and then to the tube-side fluid outlet 5 through the outer heat exchange tube 11, which greatly increases the flow area of ​​the tube-side fluid and thus effectively improves the heat exchange efficiency.

[0021] Example 2:

[0022] like Figures 1 to 3 As shown, based on Example 1,

[0023] Furthermore, the tube box 2 is provided with a lower flange 6 and the cylinder 13 is provided with an upper flange 8. The upper flange 8 and the lower flange 6 are fixedly connected by bolts. By removing the bolts, the tube box 2 and the cylinder 13 can be separated, so that the upper tube sheet 7 together with the external heat exchange tube 11 can be removed, which facilitates the maintenance of the external heat exchange tube 11.

[0024] Furthermore, the top of the external heat exchange tube 11 is provided with a first chamfer 15, which facilitates the external heat exchange tube 11 to pass through the through hole on the baffle plate 12 during installation.

[0025] Furthermore, the upper inner end of the outer heat exchange tube 11 is connected to a pipe positioning structure that can position the upper end of the inner heat exchange tube 9. After long-term use, the upper end of the inner heat exchange tube 9 is prone to bending and deformation and sticking to the inner wall of the outer heat exchange tube 11, which will lead to poor fluid flow in the tube. By positioning the upper end of the inner heat exchange tube 9 through the pipe positioning structure, deformation of the upper end of the inner heat exchange tube 9 can be effectively prevented, thus effectively solving the above problems.

[0026] Furthermore, the pipe positioning structure includes an outer connecting ring 16 and an inner connecting ring 17. The outer diameter of the outer connecting ring 16 is adapted to the inner diameter of the outer heat exchange tube 11, and the inner diameter of the inner connecting ring 17 is adapted to the outer diameter of the inner heat exchange tube 9. The outer connecting ring 16 and the inner connecting ring 17 are fixedly connected by multiple connecting ribs 18. By inserting the outer connecting ring 16 from the port of the outer heat exchange tube 11, the outer connecting ring 16 can be pushed to the upper inner side of the outer heat exchange tube 11 with the help of tools, which is convenient for installation.

[0027] Furthermore, the upper end of the inner heat exchange tube 9 is provided with a second chamfer 19, which facilitates the insertion of the inner heat exchange tube 9 into the inner connecting ring 17.

Claims

1. A vertical heat exchanger, characterized in that: The invention comprises a skirt seat (1), the top of the skirt seat (1) is fixedly connected to a tube box (2), the upper part of the tube box (2) is fixedly connected to a cylinder (13), a shell-side fluid inlet (10) and a shell-side fluid outlet (14) are provided on the cylinder (13), a plurality of baffles (12) are fixedly connected inside the cylinder (13), the baffles (12) are penetrated with through holes, an upper tube plate (7) is connected between the cylinder (13) and the tube box (2), a plurality of external heat exchange tubes (11) are fixedly connected to the upper tube plate (7), the upper ends of the external heat exchange tubes (11) are closed and penetrate the corresponding baffles (12) The lower end of the outer heat exchange tube (11) is open and penetrates the upper tube plate (7) to communicate with the tube box (2); the tube box (2) is provided with a tube-side fluid outlet (5) and a tube-side fluid inlet (3) distributed up and down; the tube box (2) is fixedly connected with a lower tube plate (4) located between the tube-side fluid outlet (5) and the tube-side fluid inlet (3); the lower tube plate (4) is fixedly connected with inner heat exchange tubes (9) corresponding to the outer heat exchange tubes (11) one by one; the upper end of the inner heat exchange tube (9) extends to the inner upper end of the outer heat exchange tube (11); and the lower end of the inner heat exchange tube (9) penetrates the lower tube plate (4).

2. The vertical heat exchanger according to claim 1, characterized in that: The pipe box (2) is provided with a lower flange (6), and the cylinder (13) is provided with an upper flange (8), and the upper flange (8) and the lower flange (6) are fixedly connected by bolts.

3. The vertical heat exchanger according to claim 1, characterized in that: The top of the external heat exchange tube (11) is provided with a first chamfer (15).

4. The vertical heat exchanger according to any one of claims 1 to 3, characterized in that: The inner upper end of the outer heat exchange tube (11) is connected to a tube positioning structure which can position the upper end of the inner heat exchange tube (9).

5. The vertical heat exchanger according to claim 4, characterized in that: The pipe fitting positioning structure comprises an outer connecting ring (16) and an inner connecting ring (17); the outer diameter of the outer connecting ring (16) is matched with the inner diameter of the outer heat exchange tube (11); the inner diameter of the inner connecting ring (17) is matched with the outer diameter of the inner heat exchange tube (9); the outer connecting ring (16) and the inner connecting ring (17) are fixedly connected via a plurality of connecting ribs (18).

6. The vertical heat exchanger according to claim 5, characterized in that: The upper end of the inner heat exchange tube (9) is provided with a second chamfer (19).

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