Sliding structure of heat exchanger
By adopting a sliding structure design in the rectangular heat exchanger of the lithium bromide unit, the internal stress problem caused by the difference in thermal expansion coefficients was solved, thereby reducing stress corrosion and mechanical wear and improving the stability and lifespan of the equipment.
Patent Information
- Application Number
- CN202520203480.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-02-10
AI Technical Summary
The existing rectangular heat exchangers used in lithium bromide units suffer from internal stress problems due to different coefficients of thermal expansion, which may lead to stress corrosion and mechanical wear of the heat exchange tubes.
The design employs a sliding structure, with the tube sheet fixed at one end of the shell and the tube sheet sliding at the other end. Through sliding support and fully enclosed welded connection, internal stress is reduced, and stress corrosion and mechanical wear caused by thermal expansion of materials are avoided.
It achieves reduced internal stress, stress corrosion and mechanical wear under vacuum conditions, and is suitable for heat exchangers in lithium bromide units, improving equipment stability and lifespan.
Smart Images
Figure CN223882833U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to heat exchanger technical field especially relates to a heat exchanger's sliding structure. BACKGROUND
[0002] The lithium bromide unit adopts the rectangular heat exchanger, and its structure is shown in the drawings Figure 1 and 2 The existing fixed tube plate 01 is arranged at both ends of the existing shell 05, the existing heat exchange pipe 04 is arranged in the existing shell 05, the existing partition plate 06 is arranged between the existing heat exchange pipe 04, the high-temperature fluid flowing in the existing heat source inlet 08 flows into the chamber between the existing shell 05 and the existing flange 02 and the existing cover plate 03 through the existing heat exchange pipe 04 above the existing partition plate 06, and then flows into the existing heat exchange pipe 04 below the existing partition plate 06, and then flows out through the existing heat source outlet 07, and the heat exchange with the cooling medium in the existing shell 05 is completed.
[0003] In the working state, the heat exchange pipe and other parts have different thermal expansion coefficients, the tube plate and the shell need to bear the internal stress caused by the internal and external pressure difference and the thermal expansion of the heat exchange pipe, and the heat exchange pipe may be subjected to stress corrosion under the action of the internal stress, and the heat exchange pipe may be deformed and mechanically abraded.
[0004] Therefore, there is an urgent need for a structure to solve the internal stress caused by the different thermal expansion coefficients of the rectangular heat exchanger. CONTENT OF THE UTILITY MODEL
[0005] To solve the problems in the prior art, the utility model aims at providing a heat exchanger sliding structure to solve the internal stress caused by the different thermal expansion coefficients of the rectangular heat exchanger for the lithium bromide unit.
[0006] To achieve the above object, the utility model provides the following scheme:
[0007] The utility model provides a heat exchanger sliding structure, which comprises a shell, one fixed tube plate is arranged at each end of the shell, a fluid cavity is arranged outside the fixed tube plate at one end of the shell, a heat source inlet is arranged at the end of the fluid cavity, a heat source outlet is arranged at the bottom of the fluid cavity, a partition plate is arranged between the heat source inlet and the heat source outlet in the fluid cavity, and the partition plate divides the fluid cavity into an inlet cavity and an outlet cavity, a sliding tube plate and a sliding support are arranged inside the other end of the shell, the sliding tube plate is arranged on the sliding support, and the sliding support is arranged on the inner wall of the shell, a plurality of heat exchange pipes are arranged between the fixed tube plate at one end of the shell and the sliding tube plate, a water vapor outlet is arranged at the top of one end of the shell, a dilute solution inlet is arranged at the top of the other end of the shell, and a concentrated liquid outlet is arranged at the bottom of the shell.
[0008] Optionally, an inner tube box is arranged between the sliding tube plate and the inner wall of the other end of the shell.
[0009] Optionally, the inner tube box and the sliding tube plate are integrated.
[0010] Optionally, the inner tube box and the sliding tube plate are fixedly connected through full-closed welding.
[0011] Optionally, the fixed tube plate at the other end of the shell and the shell are fixedly connected through full-closed welding.
[0012] Optionally, a spray head is arranged at the dilute solution inlet, and the spray head is used for spraying the dilute solution in the shell.
[0013] Optionally, the sliding support includes a sliding rail arranged at the inner bottom of the shell, and a sliding block arranged at the bottom of the sliding tube plate is slidably arranged on the sliding rail.
[0014] Optionally, the shell and the sliding tube plate are both in a rectangular structure, and the inner bottom of the shell is provided with a plurality of sliding supports.
[0015] Optionally, the heat source inlet includes an inlet flange pipe, one end of the inlet flange pipe is connected with a sealing flange, and the sealing flange and the end of the fluid cavity are connected through bolts.
[0016] Optionally, the heat source outlet includes an outlet flange pipe, one end of the outlet flange pipe is welded with the bottom of the fluid cavity.
[0017] The utility model discloses a heat exchanger with a sliding structure, which has the following technical effects compared with the prior art:
[0018] The sliding structure of the heat exchanger is completely suitable for the vacuum sealing requirement of the lithium bromide unit. The tube plate at one end of the shell is fixed, and the tube plate at the other end can slide. The tube plate, the shell and the heat exchange pipe only need to bear the internal and external pressure difference, and do not need to bear the internal stress caused by the different thermal expansion coefficients of materials. The possibility of stress corrosion and mechanical wear is reduced, and the internal stress caused by the different thermal expansion coefficients of the rectangular heat exchanger for the lithium bromide unit is solved. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.
[0020] Figure 1A schematic view of the structure of a rectangular heat exchanger in the prior art:
[0021] Figure 2 A view in the X direction in Figure 1
[0022] Figure 3 A schematic view of the structure of the sliding structure of the heat exchanger in the present application;
[0023] Figure 4 A view in the A direction in Figure 3
[0024] Explanation of reference signs:
[0025] 01, existing fixed tube sheet; 02, existing flange; 03, existing cover plate; 04, existing heat exchange tube; 05, existing shell; 06, existing partition plate; 07, existing heat source outlet; 08, existing heat source inlet;
[0026] 1, fixed tube sheet; 2, external tube box; 3, internal tube box; 4, sliding tube sheet; 5, sliding support; 6, heat exchange tube; 7, shell; 8, partition plate; 9, heat source inlet; 10, heat source outlet. DETAILED DESCRIPTION
[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.
[0028] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, obvious and easy to understand, the present application will be described in further detail below with reference to the drawings and specific embodiments.
[0029] As Figure 3 and 4 As shown, the embodiment provides a sliding structure of a heat exchanger, which comprises a shell 7, a fixed tube plate 1 arranged at each end of the shell 7, a fluid cavity arranged outside the fixed tube plate 1 at one end of the shell 7, a heat source inlet 9 arranged at an end of the fluid cavity, a heat source outlet 10 arranged at a bottom of the fluid cavity, a partition plate 8 arranged between the heat source inlet 9 and the heat source outlet 10 in the fluid cavity, the partition plate 8 separating the fluid cavity into an inlet cavity and an outlet cavity, a sliding tube plate 4 and a sliding support 5 arranged inside the other end of the shell 7, the sliding tube plate 4 slidingly arranged on the sliding support 5, the sliding support 5 arranged on an inner wall of the shell 7, a plurality of heat exchange tubes 6 arranged between the fixed tube plate 1 at one end of the shell 7 and the sliding tube plate 4, a water vapor outlet arranged at a top of one end of the shell 7, a dilute solution inlet arranged at a top of the other end of the shell 7, and a concentrated solution outlet arranged at a bottom of the shell 7.
[0030] The dilute solution is a lithium bromide solution with low concentration, enters the shell 7 through the dilute solution inlet, fully absorbs the heat released by the heat exchange tubes 6, forms water vapor, and the water vapor is discharged through the water vapor outlet at the top of the shell 7, so that the concentration of the lithium bromide solution gradually increases, forms a lithium bromide concentrated solution with high concentration, and the lithium bromide concentrated solution flows out from the concentrated solution outlet at the bottom of the shell 7 for recycling.
[0031] In a more specific embodiment, the concentrated solution outlet is arranged at the bottom of one end of the shell 7 close to the heat source outlet 10, so that the lithium bromide solution can fully contact the heat exchange tubes 6 during the process of entering and flowing out of the shell 7, thereby improving the heat exchange efficiency, and the water vapor outlet is arranged close to the heat source inlet 9, which can ensure that the water vapor has sufficient temperature, so that the water vapor near the water vapor outlet can maintain sufficient steam pressure, so as to facilitate the rapid discharge of the water vapor, which can not only ensure that the concentrated solution has high concentration, but also help to reduce the pressure inside the shell 7.
[0032] The dilute solution inlet can be directly connected with a lithium bromide solution pipeline for dilution, and the dilute solution is directly discharged into the shell 7 through the pipeline. In order to improve the heat exchange efficiency, a spray head can be arranged at the dilute solution inlet, so as to spray the dilute solution on the heat exchange tubes 6 in the shell 7, thereby quickly forming a large amount of water vapor, so as to improve the concentration efficiency of the lithium bromide solution.
[0033] Since lithium bromide has a strong corrosive effect on steel in air, but basically does not corrode metal when a corrosion inhibitor is added in a vacuum state, an internal tube box 3 is arranged between the sliding tube plate 4 and the inner wall of the other end of the shell 7. The internal tube box 3 and the sliding tube plate 4 need to be completely sealed to avoid corrosion of lithium bromide to metal, and the sliding tube plate 4 and the shell 7 are preferably fixedly connected by full-closed welding, or can be integrally cast and processed. In order to further improve the sealing performance, an external tube box 2 is arranged at the other end of the shell 7, and the external tube box 2 and the shell 7 are fixedly connected by full-closed welding.
[0034] The sliding support 5 comprises a sliding rail arranged on the inner bottom of the shell 7, and the sliding pipe plate 4 is provided with a sliding block at the bottom, which is arranged to slide on the sliding rail. In the specific embodiment, the cross sections of the shell 7 and the sliding pipe plate 4 are both rectangular structures, and the inner bottom of the shell 7 is uniformly provided with four sliding supports 5.
[0035] The heat source inlet 9 comprises an inlet flange pipe, one end of which is connected with a sealing flange, and the sealing flange is connected with the end of the fluid cavity by bolts. The heat source outlet 10 comprises an outlet flange pipe, one end of which is welded with the bottom of the fluid cavity. The heat source flows into the inlet flange pipe, then enters the heat exchange pipe 6 above the partition plate 8, and then flows into the inner pipe box 3, and then flows into the heat exchange pipe 6 below the partition plate 8 from the inside of the inner pipe box 3, and then flows out from the heat exchange pipe 6 into the outlet flange pipe. During the flow process, the heat source exchanges heat with the lithium bromide solution in the shell 7 through the heat exchange pipe 6, so as to realize the concentration of the lithium bromide solution.
[0036] In other specific embodiments, the sliding support 5 can be made of steel bars. Specifically, a plurality of steel bars are welded on the inner wall of the fixed pipe plate 1, and the steel bars are located at the lower part of the sliding pipe plate 4. The steel bars can reduce the contact area between the sliding pipe plate 4 and the inner wall of the fixed pipe plate 1, thereby reducing the friction force acting on the sliding pipe plate 4, so that the sliding pipe plate 4 can slide along the steel bars under the traction of the internal stress when the temperature changes.
[0037] It should be noted that, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application, and any reference signs in the claims should not be regarded as limiting the claims.
[0038] The principles and implementation modes of the present application are described in the specific examples in the specification, and the above embodiment descriptions are only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application scope will be changed. In view of the above, the content of the specification should not be understood as a limitation of the present application.
Claims
1. A sliding structure for a heat exchanger, characterized in that, The application relates to a heat exchange device, which comprises a shell, a fixed tube plate arranged at each end of the shell, a fluid cavity arranged outside the fixed tube plate at one end of the shell, a heat source inlet arranged at the end of the fluid cavity, a heat source outlet arranged at the bottom of the fluid cavity, a partition plate arranged between the heat source inlet and the heat source outlet in the fluid cavity, the partition plate dividing the fluid cavity into an inlet cavity and an outlet cavity, a sliding tube plate arranged inside the other end of the shell, a sliding support arranged inside the shell, the sliding tube plate slidingly arranged on the sliding support, a plurality of heat exchange tubes arranged between the fixed tube plate at one end of the shell and the sliding tube plate, a water vapor outlet arranged at the top of one end of the shell, a dilute solution inlet arranged at the top of the other end of the shell, and a concentrated solution outlet arranged at the bottom of the shell. The sliding tube plate and the inner wall of the other end of the shell are provided with an internal tube box.
2. The sliding structure of a heat exchanger according to claim 1, wherein The internal tube box and the sliding tube plate are in an integrated structure.
3. The sliding structure of a heat exchanger according to claim 2, wherein The internal tube box and the sliding tube plate are fixedly connected through full-closed welding.
4. The sliding structure of a heat exchanger according to claim 2, wherein The fixed tube plate at the other end of the shell and the shell are fixedly connected through full-closed welding.
5. The sliding structure of a heat exchanger according to claim 1, wherein A spray head is arranged at the dilute solution inlet, and the spray head is used for spraying the dilute solution in the shell.
6. The sliding structure of a heat exchanger according to claim 1, wherein The sliding support comprises a sliding rail arranged at the inner bottom of the shell, and a sliding block arranged at the bottom of the sliding tube plate and slidingly arranged on the sliding rail.
7. The sliding structure of a heat exchanger according to claim 1, wherein The shell and the sliding tube plate are both in a rectangular structure, and the inner bottom of the shell is provided with a plurality of sliding supports.
8. The sliding structure of a heat exchanger according to claim 1, wherein The heat source inlet comprises an inlet flange pipe, one end of the inlet flange pipe is connected with a sealing flange, and the sealing flange and the end of the fluid cavity are connected through bolts.
9. The sliding structure of a heat exchanger according to claim 1, wherein The heat source outlet comprises an outlet flange pipe, and one end of the outlet flange pipe is weldedly connected with the bottom of the fluid cavity.
10. The sliding structure of a heat exchanger according to claim 1, wherein