Double-shell-side heat exchanger

Abstract

A double-shell-pass heat exchanger comprises an upper tube box, a lower tube box, a shell, tube plates, heat exchange tubes and a tube bundle support, and is characterized in that the shell comprises an upper shell body and a lower shell body, the tube plates comprise an upper tube plate, a middle tube plate and a lower tube plate, the upper tube plate is fixedly connected between the upper tube box and the upper shell body, the lower tube plate is fixedly connected between the lower tube box and the lower shell body, and the upper shell body and the lower shell body are fixedly connected through the middle tube plate. The upper shell and the lower shell are respectively provided with a shell pass inlet and a shell pass outlet; the tube bundle support comprises an upper tube box support and a lower tube box support, one end of the upper tube box support and one end of the lower tube box support are fixedly connected to the middle tube plate, and the other ends extend towards the upper tube box or the lower tube box. The tube bundle supports are arranged on the middle tube plate at the same time, the positioning reference is unique, and the coaxiality of tube holes of baffle plates on the tube bundle supports on the two sides and the overall stress uniformity of the heat exchanger can be better guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, specifically to a double-shell heat exchanger. Background Technology

[0002] Dual-shell heat exchangers enable independent circulation of two fluids, avoiding the mutual interference between the two fluids in traditional heat exchangers, thus achieving a more efficient heat exchange effect. Therefore, dual-shell heat exchangers are often used to process high-temperature and high-pressure chemical fluids, as well as waste gas and wastewater that require heat recovery, thereby realizing energy reuse and achieving the goal of energy saving and consumption reduction.

[0003] Two-shell heat exchangers require at least three tube sheets. Conventional heat exchangers are equipped with baffles to increase the mixing degree of the fluid, thereby improving heat exchange efficiency. By changing the flow direction and velocity of the fluid, baffles prevent dead zones and dead areas caused by prolonged lateral flow, ensuring uniform fluid mixing.

[0004] Due to the multiple tube sheets and numerous baffles in double-shell heat exchangers, the tube insertion process is extremely difficult. It is difficult to ensure the coaxiality of the heat exchange tube holes in the baffles and the tube sheets. As disclosed in CN215766623U, the upper and lower tube-side baffles are respectively set on the upper tube sheet and the middle tube sheet. It is difficult to adjust the coaxiality of the tube holes in the upper and lower shells, resulting in a large amount of labor waste and easy damage to the heat exchange tubes. In addition, the upper tube sheet needs to be thicker to meet the design requirements.

[0005] To address the above issues, a two-shell heat exchanger was designed. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a double-shell heat exchanger that can ensure the coaxiality of the baffle tube holes in the upper and lower shells, reduce the need for baffle adjustment during tube insertion, improve tube insertion efficiency, and reduce wear.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A double-shell heat exchanger includes upper and lower tube boxes, a shell, a tube sheet, heat exchange tubes, and a tube bundle support. The shell includes an upper shell and a lower shell, the tube sheet includes an upper tube sheet, an intermediate tube sheet, and a lower tube sheet. An upper tube sheet is fixedly connected between the upper tube box and the upper shell, and a lower tube sheet is fixedly connected between the lower tube box and the lower shell. The upper shell and the lower shell are fixedly connected through an intermediate tube sheet. The upper and lower shells are respectively provided with shell-side inlet and outlet.

[0008] The tube bundle support includes an upper tube box support and a lower tube box support. One end of the upper tube box support and the lower tube box support are fixedly connected to the intermediate tube sheet, and the other end extends towards the upper tube box or the lower tube box, respectively.

[0009] Preferably, the heat exchange tubes penetrate the intermediate tube sheet, and both ends are fixedly connected to the upper and lower tube sheets respectively, with the heat exchange tubes expanded onto the intermediate tube sheet.

[0010] Preferably, the tube bundle support includes multiple spaced tubes, tie rods, and baffles. One end of the tie rod is fixedly connected to the intermediate tube sheet, and the other end extends towards the upper tube box and the lower tube box, respectively.

[0011] Preferably, the tie rod and the spacer tube are parallel to the heat exchange tube, and the baffle is set perpendicular to the axis of the heat exchange tube.

[0012] Preferably, the baffle is provided with a notch for the flow of medium in the shell side, the notches of adjacent baffles are in opposite directions, and the area of ​​the notch is no more than 1 / 5 of the inner diameter of the shell.

[0013] Preferably, the baffle is fixed by multiple tie rods and a spacer tube sleeved on the tie rods. The tie rods are threaded at the ends away from the intermediate tube sheet, and the baffle is fixed to the tie rods by nuts.

[0014] Preferably, the shell-side medium inlet is equipped with an anti-impact baffle, which is fixed to the tie rod.

[0015] Preferably, the shell-side medium outlet is provided with an anti-impact component, which is fixedly connected to the shell.

[0016] Preferably, each tube sheet is provided with a drain outlet, which is located on the periphery of the tube sheet, and a drain channel is provided inside the tube sheet that is connected to the drain outlet.

[0017] Preferably, the drain channels of the upper and lower tube sheets are located on the side of the upper and lower tube sheets closer to the middle tube sheet, and drain channels are provided on both sides of the middle tube sheet.

[0018] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0019] 1. This solution adopts the method of simultaneously setting the tube bundle support on the intermediate tube sheet, with a unique positioning reference, which can better ensure the coaxiality of the baffle tube holes on both sides of the tube bundle support.

[0020] 2. This scheme optimizes the arrangement of the tubes, fixing the tubes on both sides to the corresponding positions of the middle tube sheet, and roughly locating the positions of each baffle plate to facilitate subsequent precise positioning.

[0021] 3. The tie rod is also set on the intermediate tube sheet. The intermediate tube sheet is used for tube bundle support assembly and tube assembly, which eliminates the influence of the baffle plate in the upper shell on the upper tube sheet during operation, reduces the thickness of the upper tube sheet, concentrates the force of the shell medium on the baffle plate to the intermediate tube sheet and then transmits it to the whole shell, making the stress on the entire heat exchanger more uniform and improving the service life of the tube sheet. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of the present invention;

[0025] Figure 2 This is a schematic diagram of the tie rod distribution of this utility model;

[0026] Figure 3 This is a schematic diagram of the installation structure of the anti-impact component of this utility model;

[0027] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0028] Figure 5 This is a schematic diagram of the tube sheet structure of this utility model;

[0029] Figure 6 for Figure 5 Enlarged view of section B in the middle;

[0030] Figure 7 for Figure 1 Enlarged view of section C.

[0031] Wherein: 1. Bottom tube box; 2. Bottom tube sheet; 3. Shell-side outlet;

[0032] 41. Pull rod A; 42. Pull rod B; 43. Pull rod C; 44. Pull rod D;

[0033] 5. Support;

[0034] 61. Distance tube A; 62. Distance tube B; 63. Distance tube C; 64. Distance tube D; 65. Distance tube E; 66. Distance tube F; 67. Distance tube G;

[0035] 7. Lower shell; 8. Baffle plate; 9. Intermediate tube sheet; 10. Upper shell; 11. Upper tube sheet; 12. Upper tube box;

[0036] 13-1. Drainage passage; 13-2. Drainage outlet;

[0037] 14. Impact-resistant components; 14-1. Impact-resistant plate; 14-2. Impact-resistant spring;

[0038] 15. Shell-side inlet; 16. Heat exchange tubes. Detailed Implementation

[0039] 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.

[0040] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" and "connected" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0041] The directional terms mentioned in the embodiments of this utility model, such as "inner", "outer", "upper", "lower", "left", "right", "top", and "bottom", are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0042] Example:

[0043] like Figure 1 As shown, a double-shell heat exchanger includes an upper tube box 12, a lower tube box 1, a shell, a tube sheet, heat exchange tubes 16, and a tube bundle support. The shell includes an upper shell 10 and a lower shell 7. The tube sheet includes an upper tube sheet 11, an intermediate tube sheet 9, and a lower tube sheet 2. The upper tube sheet 11 is fixedly connected between the upper tube box 12 and the upper shell 10. The lower tube sheet 2 is fixedly connected between the lower tube box 1 and the lower shell 7. The upper shell 10 and the lower shell 7 are fixedly connected through the intermediate tube sheet 9. The upper shell 10 and the lower shell 7 are respectively provided with a shell-side inlet 15 and a shell-side outlet 3.

[0044] The tube bundle support includes an upper tube box 12 support and a lower tube box 1 support. One end of the upper tube box 12 support and the lower tube box 1 support are fixedly connected to the intermediate tube sheet 9, and the other end extends towards the upper tube box 12 and the lower tube box 1 respectively.

[0045] The heat exchange tube 16 penetrates the intermediate tube sheet 9, and its two ends are fixedly connected to the upper tube sheet 11 and the lower tube sheet 2 respectively. The heat exchange tube 16 is expanded and connected to the intermediate tube sheet 9.

[0046] The tube bundle support includes multiple spaced tubes, tie rods, and baffles 8. One end of the tie rod is fixedly connected to the intermediate tube sheet 9, and the other end extends towards the upper tube box 12 or the lower tube box 1, respectively.

[0047] like Figure 1 and Figure 7As shown, the baffle plate 8 is fixed by multiple tie rods and a spacer tube sleeved on the tie rods. The tie rods are threaded at the ends away from the intermediate tube sheet 9, and the baffle plate 8 is fixed to the tie rods by nuts and spacer tubes. The spacer tubes are set between the intermediate tube sheet 9 and the nearest baffle plate 8, and between two adjacent baffle plates 8, up to the outermost baffle plate 8.

[0048] The tie rod and the spacer tube are parallel to the heat exchange tube 16, and the baffle plate 8 is perpendicular to the axis of the heat exchange tube 16. In this embodiment, the distance between two adjacent baffle plates 8 is the same.

[0049] like Figure 1-2 As shown, tie rods A41, B42, C43, and D44 of different lengths are respectively installed on baffles 8 at different distances from the intermediate tube sheet 9. Figure 1 The rightmost tie rod A41 is located on the outermost baffle plate 8 of the lower housing 7. The corresponding length spacer tubes A61 and B62 are sleeved on the tie rod A41. The spacer tube B62 is located between the middle tube sheet 9 and the baffle plate 8 closest to the middle tube sheet 9 in the lower housing 7. The spacer tube A61 is located between the two baffle plates 8 furthest apart in the lower housing 7. The tie rod B42 is located on the middle baffle plate 8 of the lower housing 7. The corresponding length spacer tube C63 is sleeved on the tie rod B42. The tie rods and spacer tubes in other positions cooperate in the same way.

[0050] Tie rod D44 is located on the outermost baffle plate 8 of the upper housing 10. The corresponding length spacer tubes E65 and G67 are sleeved on tie rod D44, or the corresponding length spacer tubes D64 and F66 are sleeved on tie rod D44. Tie rod C43 is located on the baffle plate 8 in the middle position of the upper housing 10. The corresponding length spacer tubes D64 and F66 are sleeved on tie rod D44. The principle of cooperation between tie rods and spacer tubes in other positions is the same.

[0051] That is, by using fixed-distance tubes of different lengths, the relative positions of each baffle plate 8 or the relative positions of the baffle plate 8 closest to the intermediate tube sheet 9 can be guaranteed.

[0052] By setting fixed-distance tubes, the swaying of the baffle plate 8 is further reduced, and the stability of the tube bundle support is improved.

[0053] The baffle plate 8 is provided with a notch for the flow of medium in the shell side. The notches of adjacent baffle plates 8 are in opposite directions, and the area of ​​the notch is no more than 1 / 5 of the inner diameter of the shell.

[0054] An anti-impact baffle is provided at the shell-side medium inlet, and the anti-impact baffle is fixed to the tie rod.

[0055] like Figure 3-4As shown, an anti-impact assembly 14 is provided at the shell-side medium outlet, and the anti-impact assembly 14 is fixedly connected to the shell. The anti-impact assembly 14 includes an anti-impact plate 14-1 and anti-impact springs 14-2. The anti-impact springs 14-2 are fixed to both ends of the anti-impact plate 14-1 by bolts, and the anti-impact plate 14-1 is fixed to the shell or the baffle plate 8 by welding. The anti-impact assembly 14, located at the shell-side medium outlet, can change the fluid flow direction, reduce the direct impact force of the fluid, and guide the fluid to flow out of the shell side more evenly.

[0056] All tube sheets are equipped with drain ports 13-2, which are located on the periphery of the tube sheet. Drain channels 13-1 are provided inside the tube sheet and are connected to drain ports 13-2.

[0057] The inlet of the drain channel 13-1 of the upper tube sheet 11 and the lower tube sheet 2 is located on the side of the upper and lower tube sheets 2 near the middle tube sheet 9, and drain channels 13-1 are provided on both sides of the middle tube sheet 9.

[0058] Support 5 is installed on the lower shell 7, and the entire heat exchanger is connected to the base through support 5 to achieve stable fixation of the heat exchanger.

[0059] Usage process: The tube bundle support and heat exchange tubes 16 are assembled based on the intermediate tube sheet 9. The shell and tube sheet are welded at four circumferential seams, and then expanded to the lower tube sheet 2. The end of the heat exchange tube 16 is concentrated on the side of the upper tube sheet 11. After the expansion is completed, the intermediate tube sheet 9 is expanded for strength. After the pressure resistance test of the lower shell 7 is qualified, the welding and expansion of the upper tube sheet 11 are carried out.

[0060] The above are merely specific embodiments of this disclosure, enabling those skilled in the art to understand or implement this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double shell heat exchanger comprising upper and lower tube sheets, shell, tube sheet, heat exchange tubes, tube bundle support, characterized in that The shell comprises an upper shell and a lower shell, the tube plate comprises an upper tube plate, a middle tube plate and a lower tube plate, the upper tube plate is fixedly connected between the upper tube box and the upper shell, the lower tube plate is fixedly connected between the lower tube box and the lower shell, the upper shell and the lower shell are fixedly connected through the middle tube plate, and the upper shell and the lower shell are respectively provided with a shell inlet and an outlet. The tube bundle support comprises an upper tube box support and a lower tube box support, one end of the upper tube box support and the lower tube box support is respectively fixedly connected to the middle tube plate, and the other end respectively extends towards the upper tube box or the lower tube box.

2. A double shell heat exchanger as claimed in claim 1, wherein, The heat exchange tube penetrates the middle tube plate and is fixedly connected to the upper tube plate and the lower tube plate at two ends, and the heat exchange tube is expanded and connected to the middle tube plate.

3. A double shell heat exchanger as claimed in claim 1, wherein, The tube bundle support comprises a plurality of distance tubes, tie rods and baffles, one end of the tie rod is fixedly connected to the middle tube plate, and the other end respectively extends towards the upper tube box and the lower tube box.

4. A double shell heat exchanger as claimed in claim 3, wherein, The tie rod and the distance tube are parallel to the heat exchange tube, and the baffle is vertically arranged on the axis of the heat exchange tube.

5. A double shell heat exchanger as claimed in claim 4, wherein The baffle is provided with a gap for the shell medium to flow, the directions of the gaps of adjacent baffles are opposite, and the area of the gap is not greater than 1 / 5 of the inner diameter of the shell.

6. A double shell heat exchanger as claimed in claim 4, wherein, The baffle is fixed by a plurality of tie rods and distance tubes sleeved on the tie rods, and the end of the tie rod away from the middle tube plate is provided with a screw thread, and the baffle is fixed to the tie rod by a nut.

7. A double shell pass exchanger as claimed in claim 6, wherein, The shell medium inlet is provided with a shock-proof baffle, and the shock-proof baffle is fixedly connected to the tie rod.

8. A double shell pass exchanger as claimed in claim 7, wherein, The shell medium outlet is provided with a shock-proof assembly, and the shock-proof assembly is fixedly connected to the shell.

9. A double shell heat exchanger as claimed in claim 1, wherein, The tube plate is provided with a discharge port, the discharge port is arranged on the peripheral surface of the tube plate, and the tube plate is internally provided with a discharge channel in communication with the discharge port.

10. A double shell heat exchanger as claimed in claim 9, wherein, The inlet of the discharge channel of the upper tube plate and the lower tube plate is arranged on the side of the upper tube plate and the lower tube plate close to the middle tube plate, and the middle tube plate is provided with the discharge channel on both sides.

Images