Anti-corrosion heat exchanger

Abstract

The utility model discloses an anti-corrosion heat exchanger which comprises a shell, tube plates are fixedly installed at the two ends of the shell, a plurality of heat exchange tubes are fixedly installed between the two tube plates, the upper end of the shell is connected with an upper sealing head, the lower end of the shell is connected with a lower sealing head, and a first water inlet is formed in the center of the top of the upper sealing head. A first water inlet and a first water outlet are formed in the center of the bottom of the lower sealing head and communicated through a heat exchange pipe, a second water inlet is formed in the side face, close to the top, of the shell, a second water outlet is formed in the side face, close to the bottom, of the shell, and a first anti-corrosion layer is arranged on the outer surface of the heat exchange pipe. And a second anti-corrosion layer is arranged on the inner surface of the heat exchange tube. The first anti-corrosion layer is arranged on the outer surface of the heat exchange tube, so that the outer surface of the heat exchange tube is prevented from being rusted by cooling liquid, the second anti-corrosion layer is arranged on the inner surface of the heat exchange tube, the inner surface of the heat exchange tube is prevented from being corroded by acid solution, the corrosion resistance of the heat exchanger is improved, and the service life is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to an anti-corrosion heat exchanger. Background Art

[0002] The shell and tube heat exchanger is the most widely used heat exchanger in chemical and alcohol production. It is mainly composed of shell, tube sheet, heat exchange tube, head, baffle, etc. The required materials can be made of ordinary carbon steel, copper or stainless steel. During heat exchange, one fluid enters from the connecting pipe of the head, flows in the tube, and flows out from the outlet pipe at the other end of the head. This is called the tube side; another fluid enters from the shell and the pipe, and flows out from another pipe on the shell. This is called the shell side.

[0003] When the existing shell-and-tube heat exchanger is in use, fluid flows inside and outside the tubes, and some acidic solutions are often exchanged inside the heat exchange tubes. Over time, corrosion will occur on both the inside and outside of the heat exchange tubes, thereby affecting the heat exchange effect of the heat exchanger and reducing the service life of the heat exchanger. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a corrosion-resistant heat exchanger, which solves the problem that the prior art heat exchanger is easily corroded by the solution, thereby causing damage, affecting the heat exchange effect, and reducing the service life of the heat exchanger.

[0005] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: an anti-corrosion heat exchanger, comprising a shell, tube sheets are fixedly installed at both ends of the shell, a plurality of heat exchange tubes are fixedly installed between the two tube sheets, an upper end of the shell is connected to an upper head, and a lower end of the shell is connected to a lower head, a first water inlet is opened at the top center position of the upper head, a first water outlet is opened at the bottom center position of the lower head, the first water inlet and the first water outlet are connected through a heat exchange tube, a second water inlet is opened on the side of the shell near the top, a second water outlet is opened on the side of the shell near the bottom, a first anti-corrosion layer is provided on the outer surface of the heat exchange tube, and a second anti-corrosion layer is provided on the inner surface of the heat exchange tube.

[0006] The fluid to be exchanged can enter the heat exchange tube through the first water inlet of the upper head, then flow to the first water outlet of the lower head through the heat exchange tube, and finally flow out from the first water outlet. The coolant can enter the shell from the second water inlet on the shell, and after entering the shell, it flows on the surface of the heat exchange tube, thereby exchanging heat with the heat exchange tube to cool the fluid inside the heat exchange tube. The heated coolant flows out from the second water outlet below. The first anti-corrosion layer can prevent the outer surface of the heat exchange tube from rusting, and the second anti-corrosion layer can prevent the inside of the heat exchange tube from being corroded by acidic solution.

[0007] Preferably, the two tube sheets are symmetrically provided with a plurality of through holes, the through holes are arranged at equal intervals, the number of the heat exchange tubes is the same as the number of through holes on one tube sheet, and the two ends are fixedly installed in the through holes of the two tube sheets respectively. By fixedly connecting the two ends of the heat exchange tube with the through holes of the tube sheets, the fluid to be heat exchanged can only enter the heat exchange tube but cannot enter the shell, thereby preventing the fluid to be heat exchanged from mixing with the coolant.

[0008] Preferably, a baffle is fixedly mounted on the inner wall of the shell, a circular hole matching the heat exchange tube is opened on the surface of the baffle, and the baffle is sleeved on the outer side of the heat exchange tube. The baffle can force the coolant to cross-flow through the heat exchange tube multiple times along a specified path, thereby improving the cooling efficiency.

[0009] Preferably, support columns are fixedly installed at equal intervals on the bottom edge of the lower head, and the support columns enable the heat exchanger to be placed vertically on the ground.

[0010] Preferably, threads are provided on the inner sides of both ends of the shell, matching threads are provided on the outer sides of one end of the upper head away from the first water inlet and the outer sides of the lower head away from the first water outlet, and the shell is threadedly connected to the upper head and the lower head respectively. The threaded connection facilitates the subsequent disassembly of the heat exchanger.

[0011] Preferably, a sealing gasket is fixedly installed at the bottom of one end of the upper head and the lower head connected to the shell, and the sealing gasket can prevent the fluid to be cooled from leaking out.

[0012] Preferably, the inner wall of the shell and the surface of the tube sheet facing the heat exchange tube are both provided with a first anti-corrosion layer, and the inner wall of the upper head and the inner wall of the lower head and the surface of the tube sheet away from the heat exchange tube are both provided with a second anti-corrosion layer. The first anti-corrosion layer can prevent the heat exchanger from rusting, and the second anti-corrosion layer can prevent the heat exchanger from being corroded by acidic solution.

[0013] Preferably, the first anti-corrosion layer is epoxy anti-rust paint, and the second anti-corrosion layer is polyurethane-phenolic paint.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model provides a first water inlet, a heat exchange tube and a first water outlet, so that the fluid to be heat exchanged enters the heat exchange tube from the first water inlet for heat exchange and then flows out from the first water outlet; a second water inlet and a second water outlet are provided on the shell, so that the coolant can enter the shell from the second water inlet to cool the heat exchange tube and then flow out from the second water outlet; epoxy anti-rust paint is applied to the inner wall of the shell, the surface of the tube sheet facing the heat exchange tube and the outer surface of the heat exchange tube to prevent the coolant from causing rust to the heat exchanger; polyurethane-phenolic paint is applied to the inner wall of the upper head, the inner wall of the lower head, the surface of the tube sheet away from the heat exchange tube and the inner surface of the heat exchange tube to improve the corrosion resistance of the heat exchanger and prevent the problem of the heat exchanger being corroded by acidic solution and affecting the use of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front cross-sectional schematic diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of the heat exchange tube of the utility model.

[0019] In the figure: 1. Shell; 2. Tube sheet; 3. Heat exchange tube; 4. Upper head; 5. Lower head; 6. First water inlet; 7. First water outlet; 8. Second water inlet; 9. Second water outlet; 10. First anti-corrosion layer; 11. Second anti-corrosion layer; 12. Through hole; 13. Deflector baffle; 14. Support column; 15. Sealing gasket. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3The utility model provides a technical solution: comprising a shell 1, tube sheets 2 are fixedly installed at both ends of the shell 1, a plurality of heat exchange tubes 3 are fixedly installed between the two tube sheets 2, an upper end of the shell 1 is connected to an upper head 4, a lower end of the shell 1 is connected to a lower head 5, a first water inlet 6 is opened at the top center of the upper head 4, a first water outlet 7 is opened at the bottom center of the lower head 5, the first water inlet 6 and the first water outlet 7 are connected through the heat exchange tube 3, a second water inlet 8 is opened on the side of the shell 1 near the top, a second water outlet 9 is opened on the side of the shell 1 near the bottom, a first anti-corrosion layer 10 is arranged on the outer surface of the heat exchange tube 3, and a second anti-corrosion layer 11 is arranged on the inner surface of the heat exchange tube 3;

[0022] A plurality of through holes 12 are symmetrically provided on the two tube sheets 2, and the through holes 12 are arranged at equal intervals. The number of heat exchange tubes 3 is the same as the number of through holes 12 on one tube sheet 2, and both ends are fixedly installed in the through holes 12 of the two tube sheets 2 respectively.

[0023] A baffle plate 13 is fixedly mounted on the inner wall of the shell 1. A circular hole matching the heat exchange tube 3 is opened on the surface of the baffle plate 13. The baffle plate 13 is sleeved on the outer side of the heat exchange tube 3.

[0024] Support columns 14 are fixedly installed at equal intervals on the bottom edge of the lower head 5;

[0025] Both ends of the shell 1 are provided with threads on the inner side, and the outer side of one end of the upper head 4 away from the first water inlet 6 and the outer side of the end of the lower head 5 away from the first water outlet 7 are provided with matching threads, and the shell 1 is threadedly connected with the upper head 4 and the lower head 5 respectively;

[0026] A sealing gasket 15 is fixedly installed at the bottom of one end of the upper head 4 and the lower head 5 connected to the shell 1;

[0027] The inner wall of the shell 1 and the surface of the tube sheet 2 facing the heat exchange tube 3 are both provided with a first anti-corrosion layer 10, and the inner wall of the upper head 4 and the inner wall of the lower head 5 and the surface of the tube sheet 2 on the side away from the heat exchange tube 3 are both provided with a second anti-corrosion layer 11;

[0028] The first anti-corrosion layer 10 is epoxy anti-rust paint, and the second anti-corrosion layer 11 is polyurethane-phenolic paint.

[0029] Working principle: When working, the fluid to be cooled is injected into the upper surface of the tube sheet 2 from the first water inlet 6 of the upper head 4, and then flows into the heat exchange tube 3 from the through hole 12 on the tube sheet 2. At the same time, the coolant is injected into the shell 1 through the second water inlet 8 of the shell 1. The coolant flows on the baffle 13. When the coolant passes through the surface of the heat exchange tube 3, heat exchange occurs to cool the fluid to be cooled in the heat exchange tube. After cooling, the fluid flows from the heat exchange tube 3 into the lower head 5, and then flows to the outside of the heat exchanger through the first water outlet 7. The coolant flows to the bottom of the shell 1 and flows to the outside of the heat exchanger through the second water outlet 9. Since the inner side of the shell 1 and the outer side of the heat exchange tube 3 are coated with epoxy anti-rust paint, the heat exchanger will not be easily corroded by the coolant, and the inner walls of the upper head 4 and the lower head 5 and the inner side of the heat exchange tube 3 are coated with polyurethane-phenolic paint, so the heat exchanger has good corrosion resistance.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant heat exchanger, comprising a shell (1), Features: Tube sheets (2) are fixedly mounted at both ends of the shell (1), and a plurality of heat exchange tubes (3) are fixedly mounted between the two tube sheets (2). The upper end of the shell (1) is connected to an upper head (4), and the lower end of the shell (1) is connected to a lower head (5). A first water inlet (6) is provided at the center of the top of the upper head (4), and a first water outlet (7) is provided at the center of the bottom of the lower head (5). The first water inlet (6) and the first water outlet (7) are connected via the heat exchange tube (3). A second water inlet (8) is provided on the side of the shell (1) near the top, and a second water outlet (9) is provided on the side of the shell (1) near the bottom. A first anti-corrosion layer (10) is provided on the outer surface of the heat exchange tube (3), and a second anti-corrosion layer (11) is provided on the inner surface of the heat exchange tube (3).

2. The corrosion-resistant heat exchanger according to claim 1, Features: A plurality of through holes (12) are symmetrically provided on the two tube sheets (2), the through holes (12) are arranged at equal intervals, the number of the heat exchange tubes (3) is the same as the number of through holes (12) on one tube sheet (2), and the two ends are respectively fixedly mounted in the through holes (12) of the two tube sheets (2).

3. The corrosion-resistant heat exchanger according to claim 1, Features: A deflector baffle (13) is fixedly mounted on the inner wall of the shell (1), a circular hole matching the heat exchange tube (3) is opened on the surface of the deflector baffle (13), and the deflector baffle (13) is sleeved on the outer side of the heat exchange tube (3).

4. The corrosion-resistant heat exchanger according to claim 1, Features: Support columns (14) are fixedly mounted at equal intervals on the bottom edge of the lower sealing head (5).

5. The corrosion-resistant heat exchanger according to claim 1, Features: The inner sides of both ends of the shell (1) are provided with threads, and the outer sides of one end of the upper head (4) away from the first water inlet (6) and the outer sides of one end of the lower head (5) away from the first water outlet (7) are provided with matching threads, and the shell (1) is respectively connected to the upper head (4) and the lower head (5) by threads.

6. The corrosion-resistant heat exchanger according to claim 5, Features: A sealing gasket (15) is fixedly mounted on the bottom of one end of the upper sealing head (4) and the lower sealing head (5) connected to the shell (1).

7. The corrosion-resistant heat exchanger according to claim 1, Features: A first anti-corrosion layer (10) is provided on the inner wall of the shell (1) and the surface of the tube sheet (2) facing the heat exchange tube (3), and a second anti-corrosion layer (11) is provided on the inner wall of the upper head (4), the inner wall of the lower head (5) and the surface of the tube sheet (2) on the side away from the heat exchange tube (3).

8. The corrosion-resistant heat exchanger according to claim 1, Features: The first anti-corrosion layer (10) is epoxy anti-rust paint, and the second anti-corrosion layer (11) is polyurethane-phenolic paint.

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