A high pressure resistant rectangular plate and shell heat exchanger

Abstract

This invention discloses a high-pressure resistant rectangular plate-shell heat exchanger, relating to the field of heat exchange and heat recovery technology. It includes a front tube box, tube sheet, shell, plate bundle, rear tube box, and saddle. The plate bundle is composed of multiple stacked and welded plates, installed inside the shell, with both ends connected to the tube sheet. The tube sheet is welded to both ends of the shell and connected to the front and rear tube boxes by bolts. The rear tube box has a plate-side inlet, the front tube box has a plate-side outlet, and the shell has a shell-side inlet and outlet. The two fluid media flow in pure counter-current within the plate bundle. The plate-shell heat exchanger of this invention has advantages such as high heat transfer efficiency, small end temperature difference, low pressure drop, compact structure, light weight, ease of large-scale production, high pressure resistance and high temperature resistance, good sealing performance, and safety and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange and heat recovery, and in particular to a high-pressure resistant rectangular plate-shell heat exchanger. Background Art

[0002] Petrochemical plants are developing towards large-scale and high-parameterization. Traditional shell and tube heat exchangers have problems such as low heat transfer efficiency, large resistance drop, large number of equipment, large footprint, and high energy consumption. They cannot meet the requirements of energy saving and efficiency improvement of modern large-scale plants.

[0003] The plate heat exchanger is a highly efficient heat exchanger, and its heat transfer efficiency is 2-3 times that of the traditional shell and tube heat exchanger. Among the plate heat exchangers, the detachable plate heat exchanger and the semi-welded plate heat exchanger are not suitable for high-pressure occasions; the fully welded plate heat exchanger and the circular plate and shell heat exchanger are suitable for high-pressure occasions, but due to their structural characteristics, it is difficult to realize the large-scale single equipment, and there are also problems such as a large number of equipment, large land occupation and high consumables.

[0004] The plates of rectangular plate and shell heat exchangers are continuously pressed from steel coils. The length of a single plate is not restricted and it is easy to scale up. However, the existing rectangular plate and shell heat exchangers have the problem of low pressure bearing capacity and are limited in application in petrochemical applications where pressure requirements are high. The working pressure of the existing rectangular plate and shell heat exchanger technology usually does not exceed 4.0MPa.

[0005] Therefore, the present invention provides a high-pressure resistant rectangular plate and shell heat exchanger. Summary of the invention

[0006] The purpose of the present invention is to solve the defects in the prior art and to propose a high-pressure resistant rectangular plate and shell heat exchanger.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A high-pressure resistant rectangular plate and shell heat exchanger comprises a front tube box, a tube sheet, a shell, a plate bundle, a rear tube box and a saddle. The plate bundle is composed of a plurality of plates stacked and welded together. The plate bundle is installed in the shell. Both ends of the plate bundle are connected to the tube sheet. The tube sheet is welded to both ends of the shell. The tube sheet is connected to the front tube box and the rear tube box by bolts. The rear tube box is provided with a plate side inlet, the front tube box is provided with a plate side outlet, the shell is provided with a shell side inlet and a shell side outlet, and two medium fluids flow in pure countercurrent in the plate bundle.

[0009] Furthermore, the plate pieces of the plate bundle are rectangular in shape.

[0010] Furthermore, the connection between the plate bundle and the tube sheet is achieved by a soft connection using a connecting thin plate. One end of the connecting thin plate is overlap-welded to the plate bundle, and the other end is welded to the inner hole of the tube sheet. The welding position of the connecting thin plate and the tube sheet is located at the central axis in the thickness direction of the tube sheet. The thickness of the connecting thin plate is 8-14 mm.

[0011] Furthermore, the connecting thin plate is a rectangular cross-section square box composed of any one of a flat plate, an "Ω"-shaped plate or a corrugated plate, and the connecting thin plate is used to compensate for the deformation difference between the plate bundle and the tube sheet.

[0012] Furthermore, the plate bundle is provided with long insert strips with holes at the inlet and outlet of the medium channel thereof, and the long insert strips with holes are not welded to the plate sheets.

[0013] Furthermore, a partition plate is arranged between the shell side inlet and the shell side outlet of the plate bundle, and the sealing between the partition plate and the shell can be achieved by gasket sealing, spring sheet sealing or a combination of gasket and spring sheet.

[0014] Furthermore, the front pipe box and the rear pipe box are provided with manholes for personnel to enter and exit to inspect the panel bundle.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The plate and shell heat exchanger of the present invention has the advantages of high heat transfer efficiency, small temperature difference at the ends, low pressure drop, compact structure, light weight, and easy large-scale operation. At the same time, the plate and shell heat exchanger inherits the advantages of high pressure bearing and high temperature resistance, good sealing performance, safety and reliability of the shell and tube heat exchanger.

[0017] 2. The raw materials of the rectangular plates of the plate bundle in the present invention are supplied in steel coils and are continuously molded. There is no limit on the length of the plates to meet the pressure drop requirements of the process device, and it is easy to realize large-scale equipment.

[0018] 3. In the present invention, the inlet and outlet of the medium channel of the plate bundle are provided with long strips with holes, which effectively improves the strength of the end of the plate bundle, alleviates the impact of the medium on the end surface of the plate, protects the welds between the plates, and improves the bearing capacity of the weak parts of the plate.

[0019] 4. In the present invention, the plate bundle and the tube sheet are connected by a connecting thin plate to achieve "soft connection", and the connecting thin plate is used to compensate for the deformation difference between the plate bundle and the tube sheet.

[0020] 5. In the present invention, a manhole is provided at the end of the pipe box, so that personnel can enter the equipment to inspect and repair the plate bundle without removing the pipe box, thereby reducing the workload of on-site construction.

[0021] In summary, the plate and shell heat exchanger of the present invention has the advantages of high heat transfer efficiency, small temperature difference at the ends, low pressure drop, compact structure, light weight, easy large-scale, high pressure bearing and high temperature resistance, good sealing performance, safety and reliability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a left side view of the present invention;

[0025] Figure 3 for Figure 2 Schematic diagram of the installation of the long strip with holes in the middle and the inner side of the connecting thin plate;

[0026] Figure 4 It is a schematic diagram of the installation of the connecting thin plate with the tube sheet and the plate bundle when the connecting thin plate is a flat plate;

[0027] Figure 5 It is a schematic diagram of the installation of the connecting thin plate with the tube sheet and the plate bundle when the connecting thin plate is an "Ω" type plate;

[0028] Figure 6 It is a schematic diagram of the installation of the connecting thin plate with the tube sheet and the plate bundle when the connecting thin plate is a corrugated plate;

[0029] Figure 7 It is a schematic diagram of the process partition being sealed and connected to the shell through a gasket;

[0030] Figure 8 It is a schematic diagram of the step partition being sealed and connected to the housing through a spring sheet;

[0031] Fig. 9 It is a schematic diagram of the partition plate being sealed and connected to the shell through a combination of a gasket and a spring sheet.

[0032] In the figure: 1 front tube box, 2 tube plate, 3 shell, 4 plate bundle, 5 rear tube box, 6 saddle, 7 partition plate, 8 connecting thin plate, 9 manhole, 10 long strip with holes, 11 gasket, 12 spring sheet, 13 plate side inlet, 14 plate side outlet, 15 shell side inlet, 16 shell side outlet. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention;

[0034] Reference Figure 1-9A high-pressure resistant rectangular plate and shell heat exchanger includes a front tube box 1, a tube sheet 2, a shell 3, a plate bundle 4, a rear tube box 5 and a saddle 6. The plate bundle 4 is composed of a plurality of plates stacked and welded, and the plates constituting the plate bundle 4 are rectangular in shape. The raw material of the plate is steel coils that are continuously molded, and the length of the plate is not limited to meet the pressure drop requirements of the process device, and it is easy to realize the large-scale device.

[0035] The plate bundle 4 is installed in the shell 3, and the two ends of the plate bundle 4 are connected to the tube sheet 2. The tube sheet 2 is welded to the two ends of the shell 3. The tube sheet 2 is connected to the front tube box 1 and the rear tube box 5 by bolts. The rear tube box 5 is provided with a plate side inlet 13, the front tube box 1 is provided with a plate side outlet 14, and the shell 3 is provided with a shell side inlet 15 and a shell side outlet 16. The two medium fluids flow in pure countercurrent in the plate bundle 4. The cold medium fluid flows into the rear tube box 5 from the plate side inlet 13, and the hot medium fluid flows into the shell 3 from the shell side inlet 15. The cold medium fluid flows in accordance with Figure 1 The left arrow in the middle indicates the direction of flow, and the heat medium fluid flows according to Figure 1 The right arrow in the middle indicates the flow direction. After heat exchange, the cold and hot media flow out from the plate side outlet 14 and the shell side outlet 16 respectively.

[0036] The connection between the plate bundle 4 and the tube sheet 2 is achieved by a connecting thin plate 8 to realize a "soft connection". One end of the connecting thin plate 8 is overlap-welded with the plate bundle 4, and the other end is welded to the inner hole of the tube sheet 2. The welding position of the connecting thin plate 8 and the tube sheet 2 is located at the central axis in the thickness direction of the tube sheet 2. The thickness of the connecting thin plate 8 is 8-14 mm.

[0037] The connecting thin plate 8 is a rectangular cross-section square box made of any one of a flat plate, an “Ω”-shaped plate or a corrugated plate. The connecting thin plate 8 is used to compensate for the deformation difference between the plate bundle 4 and the tube sheet 2.

[0038] The above-mentioned "soft connection" form can effectively reduce the local stress at the connection between the plate bundle 4 and the tube sheet 2 caused by the bending in the plane direction of the tube sheet 2 and the compression deformation in the width direction of the plate sheet caused by the pressure load under high pressure, meet the needs of the equipment to withstand higher pressure loads, and improve the structural reliability of the equipment.

[0039] The connecting thin plates 8 have different shapes and structural dimensions to meet the bearing requirements under different pressure loads. The structure is simple to process and easy to implement.

[0040] The plate bundle 4 is provided with a long insert strip 10 with holes at the inlet and outlet of the medium channel, and the long insert strip 10 with holes is not welded to the plate. The long insert strip 10 with holes can effectively improve the strength of the end of the plate bundle 4, alleviate the impact of the medium on the end surface of the plate, protect the weld between the plates, and improve the bearing capacity of the weak parts of the plate.

[0041] The plate bundle 4 is provided with a partition plate 7 between the shell side inlet 15 and the shell side outlet 16 . The partition plate 7 and the shell 3 can be sealed by a gasket 11 , a spring sheet 12 or a combination of the gasket 11 and the spring sheet 12 .

[0042] The front pipe box 1 and the rear pipe box 5 are provided with a manhole 9 for personnel to enter and exit to inspect the plate bundle 4. The provision of the manhole 9 allows personnel to enter the interior of the equipment to inspect and repair the plate bundle 4 without removing the front pipe box 1 and the rear pipe box 5, thereby reducing the workload of on-site construction.

Claims

1. A high-pressure resistant rectangular plate and shell heat exchanger, comprising a front tube box (1), a tube sheet (2), a shell (3), a plate bundle (4), a rear tube box (5) and a saddle (6), characterized in that: The plate bundle (4) is composed of a plurality of plate sheets stacked and welded together. The plate bundle (4) is installed in the shell (3). Both ends of the plate bundle (4) are connected to the tube sheet (2). The tube sheet (2) is welded to both ends of the shell (3). The tube sheet (2) is connected to the front tube box (1) and the rear tube box (5) by bolts. The rear tube box (5) is provided with a plate side inlet (13), the front tube box (1) is provided with a plate side outlet (14), and the shell (3) is provided with a shell side inlet (15) and a shell side outlet (16). Two medium fluids flow in pure countercurrent in the plate bundle (4). The connection between the plate bundle (4) and the tube sheet (2) is achieved by a flexible connection using a connecting thin plate (8), one end of the connecting thin plate (8) is overlap-welded to the plate bundle (4), and the other end is welded to the inner hole of the tube sheet (2), the welding position of the connecting thin plate (8) and the tube sheet (2) is located at the central axis in the thickness direction of the tube sheet (2), and the thickness of the connecting thin plate (8) is 8-14 mm; The connecting thin plate (8) is a rectangular cross-section box made of any one of a flat plate, an Ω-shaped plate or a corrugated plate. The connecting thin plate (8) is used to compensate for the deformation difference between the plate bundle (4) and the tube sheet (2).

2. A high pressure resistant rectangular plate and shell heat exchanger according to claim 1, characterized in that: The plate sheets of the plate bundle (4) are rectangular in shape.

3. The high pressure resistant rectangular plate and shell heat exchanger according to claim 1, characterized in that: The plate bundle (4) is provided with a long insert strip (10) with holes at the inlet and outlet of the medium channel thereof, and the long insert strip (10) with holes is not welded to the plate sheet.

4. The high pressure resistant rectangular plate and shell heat exchanger according to claim 1, characterized in that: The plate bundle (4) is provided with a partition plate (7) between the shell side inlet (15) and the shell side outlet (16); the partition plate (7) and the shell (3) can be sealed by a gasket (11), a spring sheet (12), or a combination of the gasket (11) and the spring sheet (12).

5. The high pressure resistant rectangular plate and shell heat exchanger according to claim 1, characterized in that: The front pipe box (1) and the rear pipe box (5) are provided with manholes (9) for personnel to enter and exit the inspection panel bundle (4).

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