Shell side partitioned multi-connected heat exchanger

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a multi-union heat exchanger with a shell pass partitioned, which comprises a plurality of heat exchange modules and a middle tube box, each heat exchange module comprises a barrel, a heat exchange tube bundle and a tube plate, and the heat exchange tube bundles among different heat exchange modules are connected in series through the middle tube box; the barrel of each heat exchange module is provided with a shell pass input pipe and a shell pass output pipe; a partition plate is arranged in the barrel of at least one heat exchange module and divides the shell pass of the heat exchange module into two or more independent sub-shell passes, and the shell pass input pipe and the shell pass output pipe are arranged on the side wall, corresponding to each sub-shell pass, of the barrel. And the directional flowability of a medium in a smaller sub-shell pass is better, so that the heat exchange efficiency can be improved. Furthermore, in practice, the shell pass input pipes and the shell pass output pipes of different sub shell passes can be communicated, so that the flowing path of a shell pass medium is longer, heat exchange between the tube wall of the heat exchange tube bundle and a tube pass medium is more sufficient, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, and particularly relates to a multi-connected heat exchanger with a shell-side partitioned area. Background Art

[0002] The shell-and-tube heat exchanger is a general process equipment for heat exchange operations. Its main function is to ensure the specific temperature required for the medium in the process, and it is also one of the main equipment for improving energy utilization efficiency. It is widely used in industrial sectors such as chemical industry, petroleum, electric power, light industry, metallurgy, atomic energy, shipbuilding, aviation, heating, etc. Generally, there are various structures for shell-and-tube heat exchangers, and the forms of the shell side are also diverse: there are single-segmental baffles, double-segmental baffles, disc-and-doughnut baffles, baffle rods, and hollow ring mesh plates, etc.

[0003] For the traditional single-segmental baffle shell-and-tube heat exchanger, there are large flow and heat transfer dead zones at the root of the transverse baffle, and the heat transfer efficiency is low. One end of the transverse baffle is suspended, and the vibration at the end is strong, which causes great damage to the heat transfer tubes. Usually, in order to improve the heat transfer performance of the shell-and-tube heat exchanger, measures such as increasing the number of heat transfer tubes or connecting multiple heat exchangers in series are generally adopted. These will inevitably cause the volume of the heat exchanger to increase, the weight to increase, and the cost to increase accordingly. In some cases where there are certain requirements for space volume and heat transfer efficiency, it is very difficult to apply the traditional single-segmental shell-and-tube heat exchanger. Later, there appeared a multi-shell-pass shell-and-tube heat exchanger disclosed in the Chinese patent document with the application number CN201210134717.6, which belongs to the fields of energy and power, etc. It includes a tube pass and a shell pass; the multi-shell-pass shell-and-tube heat exchanger also includes a tube-pass inlet nozzle and a tube-pass outlet nozzle connected to the head, and a shell-pass inlet nozzle and a shell-pass outlet nozzle connected to the shell; its characteristics are: N longitudinal baffle plates that divide the inside of the heat exchanger shell into N + 1 shell-pass spaces are installed between two tube sheets, where N is greater than or equal to 2; each of the above longitudinal baffle plates has a communication hole for communicating adjacent shell passes; the positions of the communication holes on any adjacent baffle plates are respectively located at the different ends of the longitudinal baffle plate.

[0004] For a single shell, there is only one shell-pass cylinder, and the medium inside it only flows in a single space. Then there appeared a multi-connected heat exchanger, that is, the tube passes of multiple heat exchange modules are connected in series. For example, a multi-connected heat exchanger without an intermediate tube box disclosed in the Chinese patent document with the application number CN202311256386.8 includes multiple heat exchange modules connected in series in sequence. Each heat exchange module includes a shell and a tube bundle located in the shell. The tube bundle includes tube sheets located at both ends of the shell, multiple heat transfer tubes located inside the shell, baffles and baffle rods installed inside the shell to support the multiple heat transfer tubes, and tie rods connecting the tube sheets with the baffles and baffle rods; the ends of the heat transfer tubes of adjacent two heat exchange modules are welded and fixed to the tube holes of the corresponding tube sheets, and the tube sheets of adjacent two heat exchange modules are directly fixed to each other and the heat transfer tubes are connected and communicated with each other.

[0005] In the existing multi - unit heat exchanger, the shell - sides of each heat - exchange module are independent of each other. That is, each heat - exchange module's shell is provided with a separate shell - side inlet and outlet, while the tube - sides are connected in series in sequence. This means that for the heat - exchange modules further back, the temperature difference between the heat - exchange tubes and the shell - side medium is smaller, and the shell - side medium of each heat - exchange module flows out without sufficient heat exchange, increasing the energy consumption of the shell - side medium flow. If a partition plate is set inside like a heat exchanger with a single - shell - side cylinder, and a communication hole is opened in the partition plate or a distance is left between the end and the tube sheet to connect the multiple separated shell - sides, however, it is not easy to control the flow rate of the shell - side medium when opening a communication hole in the partition plate located inside the cylinder, and the opening is easily eroded and not easy to maintain later. Summary of the Invention

[0006] In view of the above - mentioned technical problems existing in the prior art, the utility model provides a multi - unit heat exchanger with shell - side zoning.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] Provide a multi - unit heat exchanger with shell - side zoning, including a plurality of heat - exchange modules and an intermediate header tank. Each heat - exchange module includes a cylinder, a heat - exchange tube bundle located inside the cylinder, and tube sheets located at both ends of the cylinder that jointly enclose the shell - side. Both ends of the heat - exchange tube bundle are welded and fixed to the corresponding tube sheets and are connected to the intermediate header tank. The heat - exchange tube bundles between different heat - exchange modules are connected in series via the intermediate header tank; the cylinders of each heat - exchange module are respectively provided with a shell - side input pipe and a shell - side output pipe; the feature is that: a partition plate is arranged inside at least one heat - exchange module's cylinder, and the partition plate divides the shell - side of this heat - exchange module into two or more independent sub - shell - sides, and the cylinder side walls corresponding to each sub - shell - side are respectively provided with the shell - side input pipe and the shell - side output pipe.

[0009] As a further optional technical solution, in the same heat - exchange module: the shell - side output pipe of one sub - shell - side is connected to the shell - side input pipe of another sub - shell - side via a connecting pipe, so that each sub - shell - side is connected in series with each other.

[0010] As a further optional technical solution, a valve is arranged on the connecting pipe for adjusting the flow rate of the connecting pipe.

[0011] As a further optional technical solution, a normally - closed spare connection pipe is also connected to the sub - shell - side.

[0012] As a further optional technical solution, the spare connection pipe is arranged on the cylinder side wall corresponding to the sub - shell - side, and the spare connection pipe is arranged beside the shell - side input pipe / shell - side output pipe.

[0013] As a further optional technical solution, the spare connection pipe is arranged at the connecting pipe, and the spare connection pipe is arranged between the valve and the shell - side input pipe / shell - side output pipe.

[0014] As a further optional technical solution, two or more heat exchange modules are provided with the partition plate and corresponding sub-shell passes.

[0015] As a further optional technical solution, the shell passes / sub-shell passes between two or more heat exchange modules communicate with each other.

[0016] As a further optional technical solution, each sub-shell pass is arranged in countercurrent with the heat exchange tube bundle.

[0017] As a further optional technical solution, the partition plate is a heat insulation plate, and / or the partition plate is a double-layer partition structure with a heat insulation material layer provided therebetween.

[0018] Advantages of the present utility model:

[0019] For a multi-connected heat exchanger with shell pass zoning of the present utility model, since a partition plate is provided in the cylinder body, the shell pass in the same cylinder body is divided into two or more sub-shell passes, and each sub-shell pass is respectively connected with a shell pass input pipe and a shell pass output pipe. Therefore, the directional fluidity of the medium in the smaller sub-shell pass is better, and the heat exchange efficiency can be improved. Further, in practice, the shell pass input pipes and shell pass output pipes of different sub-shell passes can be connected, so that the flow path of the shell pass medium is longer, and the heat exchange with the tube pass medium through the tube wall of the heat exchange tube bundle is more sufficient, thereby reducing the energy consumption. Description of the drawings

[0020] Figure 1 It is a schematic structural diagram of Embodiment 1 of a multi-connected heat exchanger with shell pass zoning of the present utility model.

[0021] Figure 2 It is a schematic structural diagram of Embodiment 2 of a multi-connected heat exchanger with shell pass zoning of the present utility model.

[0022] Figure 3 It is a schematic structural diagram of Embodiment 3 of a multi-connected heat exchanger with shell pass zoning of the present utility model.

[0023] Figure 4 It is a schematic structural diagram of Embodiment 4 of a multi-connected heat exchanger with shell pass zoning of the present utility model.

[0024] Figure 5 It is a schematic structural diagram of Embodiment 5 of a multi-connected heat exchanger with shell pass zoning of the present utility model.

[0025] Reference numerals:

[0026] Heat exchange module 1, cylinder body 11, heat exchange tube bundle 12, tube sheet 13; intermediate header 2;

[0027] Shell pass input pipe 3, shell pass output pipe 4, partition plate 5, connecting pipeline 6, valve 7, spare connection 8. Detailed implementation mode

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0029] Embodiment 1

[0030] One of the embodiments of a multi-connected heat exchanger with a shell-side partition of the present utility model is as Figure 1 shown, including a plurality of heat exchange modules 1 and an intermediate header 2. Three heat exchange modules 1 are shown in the figure, and other quantities can be actually selected according to needs. Each heat exchange module 1 includes a cylinder body 11, a heat exchange tube bundle 12 located inside the cylinder body 11, and tube sheets 13 located at both ends of the cylinder body 11 and jointly enclosing the shell side. The heat exchange tube bundle 12 includes a plurality of metal tubes arranged horizontally and in parallel. Both ends of the heat exchange tube bundle 12 are welded and fixed to the corresponding tube sheets 13 and communicate with the intermediate header 2. The heat exchange tube bundles 12 between different heat exchange modules 1 are connected in series via the intermediate header 2, and each intermediate header 2 and each heat exchange tube bundle 12 are connected to form a tube side. The cylinder bodies 11 of each heat exchange module 1 are respectively provided with a shell-side inlet pipe 3 and a shell-side outlet pipe 4. As the main improvement: a partition plate 5 is arranged inside the cylinder body 11 of one of the heat exchange modules 1, and the partition plate 5 divides the shell side of this heat exchange module 1 into two independent sub-shell sides. The side walls of the cylinder body 11 corresponding to each sub-shell side are respectively provided with the shell-side inlet pipe 3 and the shell-side outlet pipe 4. In the same heat exchange module 1: the shell-side outlet pipe 4 of one of the sub-shell sides is connected to the shell-side inlet pipe 3 of the other sub-shell side via a connecting pipe 6, so that each sub-shell side is connected in series. When in use, the shell-side medium flows in from the shell-side inlet pipe 3 at the lower right of this heat exchange module 1, enters the lower sub-shell side, then flows out from the shell-side outlet pipe 4 at the lower left into the connecting pipe 6, flows into the upper sub-shell side from the shell-side inlet pipe 3 at the upper right, and then flows out from the shell-side outlet pipe 4 at the upper left. It can be seen that the path of the medium flowing through the same shell side is longer and the heat exchange is more sufficient. Moreover, the connecting pipe 6 connecting different sub-shell sides is located outside the cylinder body 11, which is convenient for flow control and later maintenance.

[0031] In practice, more than two partition plates 5 can be provided, so as to divide the shell side into three or more sub-shell sides. The partition plate 5 is welded and fixed to the inner wall of the cylinder body 11 and the side wall of the tube sheet 13.

[0032] Of course, in practice, if there is no connecting pipe 6, the medium needs to flow into each sub-shell side from the shell-side inlet pipe 3 of each sub-shell side and flow out from the shell-side outlet pipe 4 after passing through the sub-shell side. In this way, the medium flow of each sub-shell side is independent.

[0033] Specifically, each sub-shell side is arranged in countercurrent with the heat exchange tube bundle 12. Figure 1The medium in the middle tube passes from left to right, while the media in the shell side and the sub-shell side always pass from right to left.

[0034] Optionally, the partition plate 5 is a heat insulation plate, and / or the partition plate 5 is a double-layer partition structure with a heat insulation material layer provided therebetween.

[0035] Embodiment 2

[0036] A second embodiment of the multi-connected heat exchanger with a partitioned shell side of the present utility model. The main technical solution of this embodiment is the same as that of Embodiment 1. For the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 is that, as Figure 2 shown, the two heat exchange modules 1 are provided with the partition plate 5 and the corresponding sub-shell sides. Actually, according to process requirements, more shell sides of the heat exchange modules 1 can be set as partitioned structures.

[0037] Embodiment 3

[0038] A third embodiment of the multi-connected heat exchanger with a partitioned shell side of the present utility model. The main technical solution of this embodiment is the same as that of Embodiment 1. For the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 is that, as Figure 3 shown, the shell side / sub-shell side between the two heat exchange modules 1 communicate with each other. When in use, the shell side medium flows in from the shell side input pipe 3 at the lower right of the right heat exchange module 1. After entering the shell side, it flows into the connecting pipeline 6 from the shell side output pipe 4 at the lower left, and then enters the tube side input pipe at the lower right of the middle heat exchange module 1. In this way, the shell side media of the two heat exchange modules 1 flow sequentially, further extending the path of the shell side medium.

[0039] Embodiment 4

[0040] A fourth embodiment of the multi-connected heat exchanger with a partitioned shell side of the present utility model. The main technical solution of this embodiment is the same as that of Embodiment 1. For the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 is that, as Figure 4 shown, the connecting pipeline 6 is provided with a valve 7 for adjusting the flow rate of the connecting pipeline 6, and even the connecting pipeline 6 can be completely closed. The sub-shell side is also connected with a normally closed spare connecting pipe 8. The spare connecting pipe 8 is arranged on the side wall of the corresponding cylinder body 11 of the sub-shell side, and the spare connecting pipe 8 is arranged beside the shell side input pipe 3 / shell side output pipe 4. After the connecting pipeline 6 is completely closed, that is, the different sub-shell sides are no longer connected, the spare connecting pipe 8 is used as the shell side input pipe 3 / shell side output pipe 4 to realize the independent inflow and outflow of the media of each sub-shell side.

[0041] Embodiment 5

[0042] Embodiment 5 of a multi-connected heat exchanger with shell-side zoning of the present utility model. The main technical solution of this embodiment is the same as that of Embodiment 4. For the features not explained in this embodiment, the explanations in Embodiment 4 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 4 is that, as Figure 5 shown, the spare connection pipe 8 is arranged at the connection pipe 6, and the spare connection pipe 8 is arranged between the valve 7 and the shell-side input pipe 3 / shell-side output pipe 4. Similarly, after the connection pipe 6 is completely closed, that is, different sub-shell-sides are no longer connected, the spare connection pipe 8 is used as the shell-side input pipe 3 / shell-side output pipe 4 to realize the independent inflow and outflow of the media in each sub-shell-side.

[0043] In the description of the present utility model, obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. The components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the detailed description of the embodiments of the present utility model provided in the drawings above is not intended to limit the scope of the present utility model claimed, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0045] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "arranged", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

Claims

1. A shell-side partitioned multi-connected heat exchanger, comprising a plurality of heat exchange modules (1) and an intermediate pipe box (2), each heat exchange module (1) comprising a cylinder (11), a heat exchange tube bundle (12) located in the cylinder (11), and tube sheets (13) located at both ends of the cylinder (11) and together forming a shell side, the two ends of the heat exchange tube bundle (12) being welded and fixed to the corresponding tube sheet (13) and connected to the intermediate pipe box (2), and the heat exchange tube bundles (12) between different heat exchange modules (1) are connected in series via the intermediate pipe box (2); the cylinder (11) of each heat exchange module (1) is respectively provided with a shell side input pipe (3) and a shell side output pipe (4); the characteristics are: A partition plate (5) is provided inside the cylinder (11) of at least one heat exchange module (1), and the partition plate (5) divides the shell side of the heat exchange module (1) into two or more mutually independent sub-shell sides, and the side walls of the cylinder (11) corresponding to each sub-shell side are respectively provided with the shell side inlet pipe (3) and the shell side outlet pipe (4).

2. The shell-side partitioned multi-connected heat exchanger according to claim 1, characterized in that: In the same heat exchange module (1), the shell side output pipe (4) of one sub-shell side is connected to the shell side input pipe (3) of another sub-shell side via a connecting pipe (6), so that the sub-shell sides are connected in series.

3. The shell-side partitioned multi-connected heat exchanger according to claim 2, characterized in that: The connecting pipeline (6) is provided with a valve (7) for adjusting the flow rate of the connecting pipeline (6).

4. The shell-side partitioned multi-connected heat exchanger according to claim 3 is characterized in that: The sub-shell is also connected to a normally closed standby pipe (8).

5. The shell-side partitioned multi-connected heat exchanger according to claim 4 is characterized in that: The spare connecting pipe (8) is arranged on the side wall of the cylinder (11) corresponding to the sub-shell side, and the spare connecting pipe (8) is arranged beside the shell side inlet pipe (3) / shell side outlet pipe (4).

6. The shell-side partitioned multi-connected heat exchanger according to claim 4, characterized in that: The spare connecting pipe (8) is arranged at the connecting pipeline (6), and the spare connecting pipe (8) is arranged between the valve (7) and the shell side input pipe (3) / shell side output pipe (4).

7. The shell-side partitioned multi-connected heat exchanger according to claim 1, characterized in that: More than two heat exchange modules (1) are provided with the partition plate (5) and corresponding sub-shells.

8. The shell-side partitioned multi-connected heat exchanger according to claim 1, characterized in that: The shell sides / sub-shell sides of two or more heat exchange modules (1) are interconnected.

9. The shell-side partitioned multi-connected heat exchanger according to claim 1, characterized in that: Each sub-shell pass is arranged in countercurrent with the heat exchange tube bundle (12).

10. The shell-side partitioned multi-connected heat exchanger according to claim 1, characterized in that: The partition plate (5) is a heat insulation plate, and / or the partition plate (5) is a double-layer partition plate structure with a heat insulation material layer provided therebetween.

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