Heat exchanger with high-temperature-creep-resistant flange structure

Abstract

A heat exchanger with a high-temperature-creep-resistant flange structure relates to the technical field of heat exchange structures and comprises an inlet flange, a heat exchange tube and a barrel, a cooling cavity is formed between the barrel and the heat exchange tube, and the cooling cavity extends to the back face of the inlet flange through an extension structure. The flange structure solves the problems that according to a flange structure used by a heat exchanger in the prior art, cooling water in a shell pass is far away from the flange, the flange cannot be fully cooled, the temperature of the flange is close to a tube pass medium, and the service life of the flange and the heat exchange effect of the heat exchanger are directly affected.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange structures, in particular to a heat exchanger with a high-temperature creep resistant flange structure. Background Art

[0002] Heat exchangers are devices that transfer part of the heat of hot fluid to cold fluid, also known as heat exchangers. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial production. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, etc., and are widely used.

[0003] An existing heat exchanger has a structure such as Figure 4 As shown, the tube-side medium of the heat exchanger is 980°C gas, and the shell-side medium is cooling water. Since the cylinder 100 is far away from the flange 200, the cooling water in the shell side cannot fully cool the inlet flange, which affects the service life of the flange and the heat exchange effect of the heat exchanger, and may also cause safety accidents.

[0004] As the existing devices are used, their shortcomings are gradually exposed, mainly in the following aspects:

[0005] First, the heat exchanger of the prior art uses a common flange structure. The cooling water in the shell side is far away from the flange and cannot sufficiently cool the flange, causing the temperature of the flange to be close to that of the medium in the tube side, reaching over 900°C.

[0006] Second, even if the existing flange is made of high-temperature resistant alloy N06617, creep will occur at around 670°C, which will directly affect the service life of the flange and the heat exchange effect of the heat exchanger.

[0007] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] In view of the defects in the prior art, the utility model solves the flange structure used in the heat exchanger in the traditional technology. The cooling water in the shell side is far away from the flange and cannot fully cool the flange, causing the temperature of the flange to be close to the medium in the tube side, directly affecting the service life of the flange and the heat exchange effect of the heat exchanger.

[0009] In order to solve the above problems, the utility model provides the following technical solutions:

[0010] A heat exchanger with a high temperature creep resistant flange structure comprises an inlet flange, a heat exchange tube and a cylinder, wherein a cooling cavity is formed between the cylinder and the heat exchange tube, and the cooling cavity is extended to the back side of the inlet flange by an extension structure.

[0011] As an optimized solution, a cylindrical flange is provided on the back side of the inlet flange, and the extension structure is connected to the cylindrical flange.

[0012] As an optimized solution, a heat-insulating sleeve is fixedly connected inside the inlet flange to prevent the high-temperature medium from directly contacting the inlet flange.

[0013] As an optimized solution, the heat insulating sleeve is provided with an annular cavity, and a heat insulating material is provided in the annular cavity;

[0014] The inlet end of the thermal insulation sleeve is close to the inlet end of the inlet flange.

[0015] As an optimized solution, the extension structure includes an expansion extension section located at one end of the cylinder facing the inlet flange, so as to increase the storage capacity of the cooling medium.

[0016] As an optimized solution, the inlet flange includes a large diameter end and a small diameter end, the large diameter end and the small diameter end are connected via a tapered transition section, and the cooling cavity covers the tapered transition section and the small diameter end.

[0017] As an optimized solution, the cylindrical flange is fixedly connected to the side wall of the large diameter end toward the small diameter end, and the flared end of the expansion extension section is fixedly connected to the cylindrical flange.

[0018] As an optimized solution, a shell-side outlet connected to the cooling cavity is fixedly connected to the outer wall of the cylinder, and the shell-side outlet is close to the inlet flange.

[0019] As an optimized solution, the length of the cylindrical flange is 10-20 mm.

[0020] As an optimized solution, the outer diameter and the inner diameter of the cylindrical flange are the same as those of the cylindrical body.

[0021] As an optimized solution, the cylindrical flange, the inlet flange, the cylinder body and the heat exchange tube are coaxially arranged.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The inlet flange is provided with a cylindrical flange, which is welded to the cylinder body, extending the length of the shell side so that the shell side extends to the inlet flange, so that the cooling water covers and surrounds the inlet flange, so that the cooling water is in direct contact with the inlet flange, thereby fully cooling the inlet flange;

[0024] By setting the expansion extension section, the flow rate of the cooling medium to the area is increased, so that more heat can be taken away and the inlet flange can be fully cooled further;

[0025] The cylindrical flange can increase the weld distance between the inlet flange and the cylinder, prevent the overlap of the heat-affected zone, and improve the welding quality and connection stability;

[0026] The heat-insulating sleeve is inserted into the inlet flange to avoid direct contact between the temperature medium and the inlet flange, to prevent the high-temperature medium from quickly transferring heat to the flange, and to control the temperature of the inlet flange;

[0027] When the heat exchanger provided by the utility model is used, the temperature of the flange will be stabilized at about 400°C, and there is no point in the entire flange that exceeds 600°C; this temperature is far lower than the creep temperature of the product metal (675 degrees Celsius), which can ensure long-term stable and safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0029] Figure 1 It is a structural schematic diagram of the utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the inlet flange of the utility model;

[0031] Figure 3 It is a structural schematic diagram of the location of the heat insulation material of the utility model;

[0032] Figure 4 It is a structural schematic diagram of the prior art;

[0033] Figure 5 It is a temperature analysis table of the prior art;

[0034] Figure 6 This is a temperature analysis table of the present utility model.

[0035] In the figure: 1-inlet flange; 2-cylinder; 3-heat exchange tube; 4-cooling cavity; 5-expansion extension section; 6-insulation sleeve; 7-shell outlet; 8-outlet flange; 9-shell inlet; 10-large diameter end; 11-small diameter end; 12-conical transition section; 13-cylinder flange; 14-insulation material; 15-retaining ring section. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0037] Embodiment 1;

[0038] like Figures 1 to 3 As shown, the heat exchanger with a high temperature creep resistant flange structure includes an inlet flange 1, a heat exchange tube 3 and a cylinder 2, a cooling cavity 4 is formed between the cylinder 2 and the heat exchange tube 3, and the cooling cavity 4 is extended to the back of the inlet flange 1 by an extension structure.

[0039] A cylindrical flange 13 is provided on the back of the inlet flange 1 , and the extended structure is connected to the cylindrical flange 13 .

[0040] The cylindrical flange 13 is provided to increase the weld spacing between the inlet flange 1 and the cylinder 2, prevent the overlap of the heat-affected zones, and improve the welding quality and connection stability.

[0041] A heat insulating sleeve 6 is fixedly connected inside the inlet flange 1 to prevent the high-temperature pipe medium from directly contacting the inlet flange 1 .

[0042] The heat insulating sleeve 6 is used to prevent the high-temperature medium in the pipe from quickly transferring heat to the inlet flange 1, so as to control the temperature of the inlet flange 1.

[0043] The heat insulating sleeve 6 is provided with an annular cavity, and the annular cavity is provided with heat insulating material 14. Even if the inlet flange 1 is too small and the annular cavity of the heat insulating sleeve 6 is too small to be filled with the heat insulating material 14, the annular cavity can still achieve a certain heat insulating effect.

[0044] The inlet end of the heat insulating sleeve 6 is close to the inlet end of the inlet flange 1 .

[0045] The extended structure comprises an expansion extension section 5 located at one end of the cylinder 2 facing the inlet flange 1, so as to increase the storage capacity of the cooling medium.

[0046] The inlet flange 1 includes a large diameter end 10 and a small diameter end 11 . The large diameter end 10 and the small diameter end 11 are connected via a tapered transition section 12 . The cooling cavity 4 covers the tapered transition section 12 and the small diameter end 11 .

[0047] The cylindrical flange 13 is fixedly connected to the side wall of the large diameter end 10 facing the small diameter end 11 , and the flared end of the expansion extension section 5 is fixedly connected to the cylindrical flange 13 .

[0048] The end of the cylindrical flange 13 is fixed to the expansion extension section 5 by welding.

[0049] A shell side outlet 7 connected to the cooling cavity 4 is fixedly connected to the outer wall of the cylinder 2 , and the shell side outlet 7 is close to the inlet flange 1 .

[0050] In order to avoid insufficient cooling water coverage and gas accumulation, which will affect the cooling effect, the cold medium outlet should be as close to the flange as possible. If liquid medium is used as the refrigerant, the outlet needs to be upward to prevent gas accumulation.

[0051] The length of the cylindrical flange 13 is 10-20 mm.

[0052] The outer diameter and the inner diameter of the cylindrical flange 13 are the same as those of the cylindrical body 2 .

[0053] The cylindrical flange 13, the inlet flange 1, the cylinder 2 and the heat exchange tube 3 are coaxially arranged.

[0054] The small diameter end 11 is fixedly connected to the inlet end of the heat exchange tube 3 .

[0055] The thickness of the small diameter end 11 is the same as that of the heat exchange tube 3 .

[0056] The outlet end of the heat exchange tube 3 is connected with an outlet flange 8, which is a prior art and will not be described in detail.

[0057] A shell side inlet 9 is provided near the outlet flange 8 of the cylinder.

[0058] Embodiment 2: This embodiment differs from Embodiment 1 in that the heat insulating material is disposed.

[0059] The space between the outer wall of the heat insulating sleeve 6 and the inner wall of the inlet flange 1 is filled with heat insulating material 14 .

[0060] Both ends of the heat insulating sleeve 6 are provided with retaining ring sections 15 , and the area formed between the two retaining ring sections 15 and the outer wall of the heat insulating sleeve 6 and the inner wall of the inlet flange 1 is used for heat insulating material 14 .

[0061] The assembly process of this device is:

[0062] During manufacturing, the heat exchange tube 3 is first welded to the inlet flange 1, and then non-destructive testing is performed. After the test is qualified, the insulation material is filled into the insulation sleeve 6, and the insulation sleeve 6 is inserted into the inlet flange 1 and welded. Then, the flanges of the cylinder 2 and the inlet flange 1 are butt welded, and non-destructive testing is also required after welding.

[0063] The inlet flange 1 of this solution is butt-welded with the heat exchange tube 3 and the cylinder 2, so 100% radiographic inspection can be performed to better ensure the welding quality;

[0064] During welding, attention should be paid to the gap between the cylindrical flange 13 and the conical section to avoid damaging the flange during burning through. Then, the end of the cylinder 2 close to the outlet flange 8 is welded to the heat exchange tube according to the conventional process, and finally the other pipes are welded.

[0065] During operation, the cold medium in the shell side must be introduced first, and then the high-temperature medium in the tube side to prevent equipment creep failure due to lack of cooling.

[0066] like Figure 5 As shown, the flange temperature of the prior art exceeds 900°C. Figure 6As shown, using the heat exchanger provided by the utility model, the temperature of the flange will be stabilized at about 400°C, and there is no point in the entire flange that exceeds 600°C; this temperature is far lower than the creep temperature of the product metal (675 degrees Celsius), which can ensure long-term stable and safe operation of the equipment.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A heat exchanger with a high temperature creep resistant flange structure, comprising an inlet flange (1), a heat exchange tube (3) and a cylinder (2), characterized in that: A cooling cavity (4) is formed between the cylinder (2) and the heat exchange tube (3), and the cooling cavity (4) is extended to the back side of the inlet flange (1) by means of an extended structure. The back side of the inlet flange (1) is provided with a cylindrical flange (13), and the extension structure is connected to the cylindrical flange (13).

2. The heat exchanger with a high temperature creep resistant flange structure according to claim 1, characterized in that: A heat insulating sleeve (6) is fixedly connected inside the inlet flange (1) to prevent high-temperature medium from directly contacting the inlet flange (1).

3. The heat exchanger with a high temperature creep resistant flange structure according to claim 2, characterized in that: The heat insulating sleeve (6) is provided with an annular cavity, and a heat insulating material (14) is provided in the annular cavity; The inlet end of the heat insulation sleeve (6) is close to the inlet end of the inlet flange (1).

4. The heat exchanger with a high temperature creep resistant flange structure according to claim 1, characterized in that: The extension structure comprises an expansion extension section (5) located at one end of the cylinder (2) facing the inlet flange (1), which is used to increase the storage capacity of the cooling medium.

5. The heat exchanger with a high temperature creep resistant flange structure according to claim 4, characterized in that: The inlet flange (1) comprises a large diameter end (10) and a small diameter end (11), the large diameter end (10) and the small diameter end (11) are connected via a conical transition section (12), and the cooling cavity (4) covers the conical transition section (12) and the small diameter end (11).

6. The heat exchanger with a high temperature creep resistant flange structure according to claim 5, characterized in that: The cylindrical flange (13) is fixedly connected to the side wall of the large diameter end (10) facing the small diameter end (11), and the flared end of the expansion extension section (5) is fixedly connected to the cylindrical flange (13).

7. The heat exchanger with a high temperature creep resistant flange structure according to claim 1, characterized in that: A shell-side outlet (7) connected to the cooling cavity (4) is fixedly connected to the outer wall of the cylinder (2), and the shell-side outlet (7) is close to the inlet flange (1).

8. The heat exchanger with a high temperature creep resistant flange structure according to claim 1, characterized in that: The outer diameter and inner diameter of the cylindrical flange (13) are the same as those of the cylindrical body (2).

9. The heat exchanger with a high temperature creep resistant flange structure according to claim 1, characterized in that: The cylindrical flange (13), the inlet flange (1), the cylinder (2) and the heat exchange tube (3) are coaxially arranged.

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