Multi-stream heat exchanger

Abstract

The multi-stream heat exchanger comprises a shell, tube plates are arranged at the two ends of the shell, a guide cylinder is arranged in the shell, and the two ends of the guide cylinder are fixed to the tube plates; the shell is provided with a shell pass inlet and a shell pass outlet, and the guide cylinder is connected with the shell pass inlet and the shell pass outlet; a tube bundle structure is arranged in the guide cylinder, and the tube bundle structure is blocked layer by layer by adopting a blocking element. The heat exchanger has the advantages that the problems that an existing heat exchanger is low in efficiency and insufficient in durability under complex working conditions are solved, adaptability and efficiency under the complex and changeable working conditions are improved, and a new thought is provided for energy utilization and equipment maintenance in the industrial production process; and a more efficient and high-adaptability solution is provided for industrial application.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a multi-stream heat exchanger. Background Art

[0002] In industrial applications, heat exchangers often face complex and changing working conditions, such as material durability challenges under fatigue conditions, sudden temperature changes caused by frequent start-stop, and the need to adapt to a variety of operating conditions.

[0003] Traditional heat exchangers generally adopt a multi-stream design when facing multiple operating conditions. That is, different fluids pass through different tube bundles and exchange heat in the same shell, so there will be no uneven distribution of fluids. When a shell-side fluid adopts a multi-stream design, the traditional heat exchanger has the problem that the fluid easily flows out of the shell from the outside of the tube bundle and cannot complete the heat exchange. It is necessary to solve the disadvantages of traditional heat exchangers, such as Figure 1 shown. Utility Model Content

[0004] The technical problem to be solved by the present utility model is to provide a multi-flow heat exchanger in view of the above deficiencies, which solves the problems of reduced efficiency and insufficient durability of existing heat exchangers under complex working conditions, and not only improves the adaptability and efficiency under complex and changeable working conditions, but also provides new ideas for energy utilization and equipment maintenance in industrial production processes, and provides a more efficient and adaptable solution for industrial applications.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A multi-stream heat exchanger comprises a shell, tube sheets are arranged at both ends of the shell, a guide tube is arranged in the shell, and both ends of the guide tube are fixed on the tube sheets;

[0007] The shell is provided with a shell side inlet and a shell side outlet, and the draft tube is connected with the shell side inlet and the shell side outlet;

[0008] A tube bundle structure is arranged in the guide tube, and plugging elements are used in the tube bundle structure to perform layer-by-layer plugging.

[0009] Furthermore, the number of the shell side inlet and the shell side outlet is n, and n is greater than 3.

[0010] Furthermore, the shell side inlet and the shell side outlet are arranged on opposite sides of the shell.

[0011] Furthermore, connecting pipes are provided between the draft tube and the shell side inlet and the shell side outlet.

[0012] Furthermore, the tube bundle structure includes a core tube and a tube bundle. Both ends of the core tube are welded and fixed on the tube sheet. The tube bundle is wound on the core tube. The end position of each layer of tube bundle winding section is blocked by a blocking element.

[0013] Furthermore, the blocking element is an annular structure, and its cross-section may be a U-shaped structure.

[0014] Furthermore, one end of the innermost plugging element in the tube bundle structure is arranged on the core tube, and the other end is connected to the innermost tube bundle, and the remaining plugging elements are arranged between the two layers of heat exchange tubes.

[0015] Furthermore, the tube bundle structure also includes a supporting mechanism, which is evenly distributed in the circumferential direction, and the plugging element is fixed on the supporting mechanism, and the supporting mechanism is fixed on the core tube.

[0016] Furthermore, a pressure balance port is provided in the shell side outlet, and the pressure balance port is opened at the root of the connecting pipe.

[0017] Furthermore, the guide tube includes a winding pipe section, and straight pipe sections 32 are provided on both sides of the winding pipe section.

[0018] The utility model adopts the above technical solution, and compared with the prior art, has the following technical effects:

[0019] 1. Control the flow direction of shell-side fluid: through precise fluid guidance, ensure that the fluid passes through the heat exchange tube bundle effectively, reduce short-circuit flow, and improve heat exchange efficiency.

[0020] 2. Effectively control leakage flow: reduce bypass flow and leakage flow, allow more fluid to participate in heat exchange, and enhance heat exchange effect.

[0021] 3. Improve heat exchange effect: By optimizing fluid distribution and reducing thermal resistance, efficient heat exchange can be maintained even under frequently changing working conditions.

[0022] 4. Enhance equipment durability: Special structural design effectively extends the service life of equipment under fatigue conditions.

[0023] 5. The design of the pressure balance port avoids excessive local pressure, ensures the safety of long-term operation of the equipment, and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1It is a schematic diagram of the heat exchanger structure in the background technology of the utility model;

[0026] Figure 2 This is a schematic diagram of the heat exchanger structure in the embodiment of the utility model;

[0027] Figure 3 for Figure 2 Middle A-direction view;

[0028] Figure 4 This is a schematic diagram of a blocking element in an embodiment of the utility model;

[0029] Figure 5 This is a schematic diagram of the fluid flow direction of the heat exchanger in the embodiment of the utility model;

[0030] Figure 6 This is a schematic diagram of the pressure balance port arrangement in the embodiment of the utility model;

[0031] In the figure: A- fluid flow direction diagram, 1- shell, 2- tube sheet, 3- guide tube, 4- shell inlet, 5- shell outlet, 6- connecting pipe, 7- core tube, 8- tube bundle, 9- plugging element, 10- supporting mechanism, 11- heat exchange tube, 12- pressure balance port, 31- winding tube section, 32- straight tube section. DETAILED DESCRIPTION

[0032] Examples, such as Figures 2 to 5 As shown, a multi-stream heat exchanger comprises a shell 1 , with tube sheets 2 provided at both ends of the shell. A guide tube 3 is provided inside the shell 1 , with both ends of the guide tube 3 fixed on the tube sheets 2 .

[0033] The shell 1 is provided with a shell inlet 4 and a shell outlet 5, and there are n shell inlets 4 and shell outlets 5, where n is greater than 3. The shell inlet 4 and the shell outlet 5 are arranged on opposite sides of the shell 1, and preferably the shell inlet 4 and the shell outlet 5 are designed to correspond to each other.

[0034] A connecting pipe 6 is provided between the draft tube 3 and the shell side inlet 4 and the shell side outlet 5, so as to facilitate the shell side fluid to directly enter the draft tube 5, thereby reducing the leakage flow.

[0035] The guide tube 3 includes a winding pipe section 31 , and straight pipe sections 32 are provided on both sides of the winding pipe section 31 .

[0036] The guide tube 3 is provided with a tube bundle structure, which includes a core tube 7 and a tube bundle 8 . Both ends of the core tube 7 are welded and fixed on the tube sheet 2 , and the tube bundle 8 is wound on the core tube 7 .

[0037] The tube bundle structure is sealed layer by layer using the sealing element 9, and the position and number of the sealing layers are adjusted according to the working conditions, so as to control the fluid flow rate and flow rate in different areas, reduce the invalid circulation area, and optimize the overall flow field distribution.

[0038] Seal the end position of the winding section of each layer of tube bundle 8 with a sealing element 9, mainly sealing the shell-side fluid within the tube-winding section 31 area, reducing the flow of N3a / N3d fluid to the straight tube section 32 area. The sealing element 9 is of an annular structure, and its cross-section can be a C-shaped structure, which is convenient for fixing the tube-winding layer formed by the bottom edge and the tube bundle 8. One end of the innermost sealing element 9 is arranged on the core barrel 7, and the other end is connected to the innermost tube bundle 8. The remaining sealing elements 9 are arranged between two layers of heat exchange tubes 11, playing a role in blocking the fluid flow. However, there are still gaps, resulting in some fluid flowing into the head.

[0039] The straight tube sections 32 of the guide cylinders 3 are provided at both ends of the tube bundle 8. The straight tube sections 32 have the functions of guiding and distributing the fluid, ensuring the uniform distribution of the fluid entering the tube bundle. At the same time, it guides again at the outlet of the tube bundle, reducing turbulence and leakage flow, improving the heat exchange efficiency, fully exchanging heat for the fluid not intercepted by the blockage, and guiding it to the outlet side.

[0040] By adopting structural optimization, a support mechanism 10 is added to the tube bundle structure. The support mechanism 10 is circumferentially evenly distributed. The sealing element 9 is fixed on the support mechanism 10, and the support mechanism 10 is fixed on the core barrel 7. The support mechanism 10 can be a support plate or a support rod to enhance the durability of the heat exchanger under conditions of frequent start-up and shutdown and rapid temperature change. For working conditions such as frequent start-up and shutdown and vibration conditions, use support rods or support plates to fix the sealing element 9 and the core barrel 7. The selected form and specifications of the support plate or support rod can be selected according to actual operations. The support mechanism 10 is welded and fixed to the core barrel 7, and each sealing element 9 is welded and fixed to the support mechanism 10.

[0041] As Figure 6 shown, a pressure balance port 12 is provided in the shell-side outlet 5. The pressure balance port 12 is opened at the root of the nozzle 6, preventing the formation of local high pressure in the shell side due to the blockage. This design allows for fine-tuning of the pressure in the shell side, maintaining the overall pressure balance, and avoiding additional stress on the shell.

[0042] The description of the present utility model is given for purposes of illustration and description, and is not intended to be exhaustive or to limit the present utility model to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles of the present utility model and its practical applications, and to enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. A multi-stream heat exchanger, characterized in that: It includes a shell (1), tube sheets (2) are provided at both ends of the shell, a guide cylinder (3) is arranged inside the shell (1), and both ends of the guide cylinder (3) are fixed on the tube sheets (2); A shell-side inlet (4) and a shell-side outlet (5) are provided on the shell (1), and the guide cylinder (3) is connected to the shell-side inlet (4) and the shell-side outlet (5); A tube bundle structure is arranged inside the guide cylinder (3), and plugging elements (9) are used for layer-by-layer plugging inside the tube bundle structure.

2. A multi-stream heat exchanger according to claim 1, characterized in that: There are n shell-side inlets (4) and n shell-side outlets (5), where n is greater than 3.

3. A multi-stream heat exchanger according to claim 1, characterized in that: The shell-side inlet (4) and the shell-side outlet (5) are arranged on opposite sides of the shell (1).

4. A multi-stream heat exchanger according to claim 1, characterized in that: Nozzles (6) are arranged between the guide cylinder (3) and the shell-side inlet (4) and the shell-side outlet (5).

5. A multi-stream heat exchanger according to claim 1, characterized in that: The tube bundle structure includes a core cylinder (7) and a tube bundle (8). Both ends of the core cylinder (7) are welded and fixed on the tube sheets (2), and the tube bundle (8) is wound around the core cylinder (7). The end position of each winding section of the tube bundle (8) is plugged with a plugging element (9).

6. A multi-stream heat exchanger according to claim 1, characterized in that: The plugging element (9) is of an annular structure, and its cross-section can be a U-shaped structure.

7. A multi-stream heat exchanger according to claim 5, characterized in that: One end of the innermost plugging element (9) in the tube bundle structure is arranged on the core cylinder (7), and the other end is connected to the innermost tube bundle (8). The remaining plugging elements (9) are arranged between two layers of heat exchange tubes (11).

8. A multi-stream heat exchanger according to claim 5, characterized in that: The tube bundle structure further includes a support mechanism (10). The support mechanism (10) is circumferentially evenly distributed. The plugging element (9) is fixed on the support mechanism (10), and the support mechanism (10) is fixed on the core cylinder (7).

9. A multi-stream heat exchanger according to claim 4, characterized in that: A pressure balance port (12) is arranged inside the shell-side outlet (5), and the pressure balance port (12) is opened at the root of the nozzle (6).

10. A multi-stream heat exchanger according to claim 1, characterized in that: The guide cylinder (3) includes a tube-winding section (31), and straight tube sections (32) are arranged on both sides of the tube-winding section (31).

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