Heat exchange tube for tube-on-sheet heat exchanger, heat exchange module and split-type tube-on-sheet heat exchanger

Abstract

The utility model discloses a heat exchange tube for a tube-on-sheet heat exchanger, a heat exchange module and a split type tube-on-sheet heat exchanger. The heat exchange tube comprises an inlet tube group, a collecting tube, a first outlet tube group and a second outlet tube group, the inlet pipe is connected to the reference side wall of the collecting pipe. A plurality of outlet pipes of the first outlet pipe set are connected to the side wall opposite to the reference side wall. A plurality of outlet pipes of the second outlet pipe set are connected to the side wall adjacent to the reference side wall and communicate with the interior of the collecting pipe. According to the heat exchange tube, the collecting tube structure is additionally arranged between the inlet flat tube and the outlet flat tube, the number of outlets of the heat exchanger is rearranged through the collecting tube, namely, the one-inlet multi-outlet flat tube structure arrangement is adopted, and the higher space utilization rate is achieved. The device can completely adapt to the problem that the fluid inlet and the fluid outlet of the field heat exchanger are different in direction and are matched on the same side when various devices are transformed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, and in particular to a heat exchange tube, a heat exchange module and a split-type plate-tube heat exchanger used in a plate-tube heat exchanger. Background Art

[0002] Plate and tube heat exchangers are a type of shell and tube heat exchanger widely used in industries such as petrochemicals and nuclear power. They are primarily used to transfer heat between different fluids, thereby cooling and / or heating the fluids. A plate and tube heat exchanger typically consists of a shell, heat transfer tube bundles, tube sheets, baffles (or baffles), and a tube box. The shell is typically cylindrical, housing the tube bundle, which is secured to the tube sheet at both ends. Within a shell and tube heat exchanger, the two fluids exchanging heat: one flows within the tube bundle, forming the tube side; the other flows between the shell and the tube bundle, forming the shell side.

[0003] However, conventional heat exchangers utilize a welded structure with multiple rows of tubes arranged in a single inlet and outlet. This arrangement results in a sparse arrangement of flat tubes at the heat exchanger outlet, resulting in low space utilization. Furthermore, both cross-flow and counter-flow configurations are achieved through single tube bends, requiring the inlet and outlet directions to be customized based on site requirements, which is inflexible. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems of low space utilization and inflexible adjustment of the inlet and outlet directions of the plate and tube heat exchanger in the prior art, and to provide a heat exchange tube, a heat exchange module and a split plate and tube heat exchanger for the plate and tube heat exchanger.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a heat exchange tube for a plate-tube heat exchanger, comprising an inlet tube group, a collecting tube, a first outlet tube group and a second outlet tube group;

[0006] The inlet pipe group is composed of a plurality of inlet pipes arranged side by side, and the first outlet pipe group and the second outlet pipe group are both composed of a plurality of outlet pipes arranged side by side;

[0007] The inlet pipe and the outlet pipe are both flat pipes, and the manifold is a rectangular pipe;

[0008] The multiple inlet pipes of the inlet pipe group are distributed along the length direction of the manifold, and the tail ends of the inlet pipes are connected to the reference side wall of the manifold and communicate with the interior of the manifold;

[0009] The plurality of outlet pipes of the first outlet pipe group are distributed along the length direction of the manifold, and the head ends of the outlet pipes are connected to the side wall of the manifold opposite to the reference side wall and communicate with the interior of the manifold;

[0010] The plurality of outlet pipes of the second outlet pipe group are distributed along the length direction of the manifold, and the head ends of the outlet pipes are connected to the side wall of the manifold adjacent to the reference side wall and communicate with the interior of the manifold;

[0011] The axes of the outlet pipes are arranged parallel to each other, and the axes of the inlet pipe and the outlet pipe are arranged perpendicular to each other.

[0012] As a further optimization of the heat exchange tube for the plate-tube heat exchanger of the utility model: the inlet tube and the outlet tube are both rectangular tubes.

[0013] As a further optimization of the heat exchange tube for the plate-tube heat exchanger of the utility model: the inlet tube and the outlet tube are both metal tubes with a wall thickness of 0.1-0.5 mm.

[0014] As a further optimization of the heat exchange tubes for the plate-tube heat exchanger of the utility model: the number of inlet tubes in the inlet tube group is consistent with the number of outlet tubes in the first outlet tube group and the number of outlet tubes in the second outlet tube group.

[0015] As a further optimization of the heat exchange tubes for the plate-tube heat exchanger of the utility model: the collecting tubes are square tubes.

[0016] As a further optimization of the heat exchange tube for the plate-tube heat exchanger of the utility model: the inlet tube forms an angle of 45° with the reference side wall, and the outlet tube forms an angle of 45° with the corresponding side wall.

[0017] The utility model also provides a heat exchange module, including a tube box and the above-mentioned heat exchange tubes, wherein the tube box is provided with an inlet tube sheet at the inlet tube head end corresponding to the heat exchange tube, and the inlet tube sheet is provided with a plurality of inlet through holes corresponding one-to-one to the inlet tubes, and the tube box is provided with an outlet tube sheet at the outlet tube tail end corresponding to the heat exchange tube, and the outlet tube sheet is provided with a plurality of outlet through holes corresponding one-to-one to the outlet tubes.

[0018] As a further optimization of a heat exchange module of the present invention: the pipe box has an inverted L-shaped structure, the collecting pipe of the heat exchange pipe is located at the corner of the pipe box, the inlet pipe of the heat exchange pipe is located in the horizontal part of the pipe box, and the outlet pipe of the heat exchange pipe is located in the vertical part of the pipe box.

[0019] The utility model also provides a split-type plate-tube heat exchanger, which is assembled from heat exchange modules.

[0020] As a further optimization of a split plate and tube heat exchanger of the utility model: the heat exchanger is assembled by a first heat exchange module, a second heat exchange module and a third heat exchange module, the third heat exchange module is embedded in the notch of the second heat exchange module, the second heat exchange module is embedded in the notch of the first heat exchange module, the interiors of the first heat exchange module, the second heat exchange module and the third heat exchange module are interconnected, the horizontal part of the pipe box of the first heat exchange module is provided with a shell-side medium outlet, and the vertical part of the pipe box of the first heat exchange module is provided with a shell-side medium inlet.

[0021] The utility model has the following beneficial effects:

[0022] 1. The heat exchange tube of this utility model adds a collecting pipe structure between the inlet and outlet flat tubes, and rearranges the number of heat exchanger outlets through the collecting pipe, that is, adopts a "one inlet and multiple outlets" flat tube structure arrangement to achieve higher space utilization;

[0023] 2. The heat exchanger of the present invention has a separate structure design for the fluid inlet and outlet pipes. The inlet and outlet directions of the heat exchanger can be adapted by rotating the direction of the collecting pipe. This is fully adaptable to the problem of different inlet and outlet directions and same-side adaptation of the fluid on-site heat exchangers during the modification of various devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the heat exchange tube of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the collecting pipe in the heat exchange tube of the utility model;

[0026] Figure 3 This is a schematic diagram of the external structure of the heat exchanger (two modules) of the present invention;

[0027] Figure 4 This is a schematic diagram of the internal structure of the heat exchanger (two modules) of the present invention;

[0028] Figure 5 This is a schematic diagram of the external structure of the heat exchanger (three modules) of the present utility model;

[0029] Markings in the figure:

[0030] 1. Imported pipe group;

[0031] 2. Collecting duct;

[0032] 3. The first outlet pipe group;

[0033] 4. Second outlet pipe group;

[0034] 5. Pipe box;

[0035] 6. Imported tube sheet;

[0036] 7. Outlet tube sheet;

[0037] 8. Shell side medium outlet;

[0038] 9. Shell side medium inlet. DETAILED DESCRIPTION

[0039] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments.

[0040] <Heat exchange tube>

[0041] like Figure 1 Shown: A heat exchange tube for a plate-tube heat exchanger, comprising an inlet tube group 1, a collecting pipe 2, a first outlet tube group 3 and a second outlet tube group 4.

[0042] The inlet pipe group 1 is composed of a plurality of inlet pipes arranged side by side, and the first outlet pipe group 3 and the second outlet pipe group 4 are both composed of a plurality of outlet pipes arranged side by side.

[0043] The inlet and outlet pipes are both flat tubes, while the manifold 2 is a rectangular tube. More specifically, the inlet and outlet pipes have rectangular cross-sections, while the manifold 2 has a square cross-section. Flat tubes are used for the following reasons: ① Round steel of the same unit volume occupies more space than rectangular flat tubes, making it difficult to improve space utilization and reduce the volume and weight of the equipment, resulting in higher costs. ② Using round tubes requires cutting oblique circular holes in the manifold's slanted surface, making manufacturing less convenient than using rectangular flat holes in the manifold. Rectangular welds also provide higher quality than intersecting line welds.

[0044] The material selection of heat exchange tubes is affected by factors such as the use environment, medium characteristics, process requirements, and cost-effectiveness. Optional materials include stainless steel (304 stainless steel, 316 stainless steel, etc. Among them, 316 stainless steel has better resistance to pitting and crevice corrosion due to the addition of molybdenum) and copper tubes (good thermal conductivity, able to transfer heat quickly; strong corrosion resistance, not easily affected by pollutants such as scale).

[0045] In order to achieve the goal of overall lightweighting of the heat exchange tube, the inlet tube and the outlet tube are both thin-walled flat tubes, and the wall thickness of the inlet tube and the outlet tube can be designed to be 0.1-0.5mm.

[0046] The multiple inlet pipes of the inlet pipe group 1 are distributed along the length direction of the manifold 2 , and the tail ends of the inlet pipes are connected to the reference side wall of the manifold 2 and communicate with the interior of the manifold 2 .

[0047] The multiple outlet pipes of the first outlet pipe group 3 are distributed along the length of the manifold 2, with their head ends connected to the sidewall of the manifold 2 opposite the reference sidewall and communicating with the interior of the manifold 2. The multiple outlet pipes of the second outlet pipe group 4 are distributed along the length of the manifold 2, with their head ends connected to the sidewall of the manifold 2 adjacent to the reference sidewall and communicating with the interior of the manifold 2.

[0048] The reference side wall is only a definition. The side wall where the collecting pipe 2 is connected to the inlet pipe is defined as the reference side wall. The definition of the reference side wall is mainly to clarify the structure of the heat exchange tube and does not have any limiting meaning.

[0049] The axes of the outlet pipes are arranged parallel to each other, and the axes of the inlet pipes are arranged perpendicular to each other. Specifically, the inlet pipe forms an angle of 45° with the reference side wall, and the outlet pipe forms an angle of 45° with the corresponding side wall.

[0050] <Heat exchange module>

[0051] A heat exchange module includes a tube box 5 and the above-mentioned heat exchange tubes. The tube box 5 is provided with an inlet tube sheet 6 at the inlet tube head end corresponding to the heat exchange tube. The inlet tube sheet 6 is provided with a plurality of inlet through holes corresponding one-to-one to the inlet tubes. The tube box 5 is provided with an outlet tube sheet 7 at the outlet tube tail end corresponding to the heat exchange tube. The outlet tube sheet 7 is provided with a plurality of outlet through holes corresponding one-to-one to the outlet tubes.

[0052] The pipe box 5 has an inverted L-shaped structure. The heat exchange pipe collecting pipe 2 is located at the corner of the pipe box 5 . The heat exchange pipe inlet pipe is located in the horizontal part of the pipe box 5 , and the heat exchange pipe outlet pipe is located in the vertical part of the pipe box 5 .

[0053] <Plate and tube heat exchanger>

[0054] As shown in the figure: A split plate and tube heat exchanger is assembled from multiple heat exchange modules.

[0055] The heat exchanger is assembled from a first heat exchange module, a second heat exchange module, and a third heat exchange module. The third heat exchange module slots into the notch of the second heat exchange module, forming a rectangular box. The second heat exchange module slots into the notch of the first heat exchange module, forming a rectangular box. The first, second, and third heat exchange modules are interconnected. The horizontal portion of the first heat exchange module's pipe box 5 is equipped with a shell-side medium outlet 8, and the vertical portion of the first heat exchange module's pipe box 5 is equipped with a shell-side medium inlet 9.

[0056] In order to ensure a compact overall structure, the sizes of the first heat exchange module, the second heat exchange module and the third heat exchange module need to be adaptively designed.

[0057] During heat exchange, high-temperature flue gas enters the tube box from the shell-side medium inlet in the vertical section of the tube box of the first heat exchange module, flows upward along the shell side of the tube box, and flows out from the shell-side medium outlet in the horizontal section of the tube box of the first heat exchange module. Air enters the heat exchange tubes from the inlet tube sheets of the first, second, and third heat exchange modules, flows downward along the inside of the heat exchange tubes, exchanges heat with the high-temperature flue gas in the shell side inside the tube box, and finally flows out through the outlet tube sheets of the first, second, and third heat exchange modules.

[0058] When the fluid mass flow rate is constant, the area of ​​fluid flow at the heat exchanger inlet and outlet is determined by the volume density of the fluid at the corresponding temperature at the heat exchanger inlet and outlet. Due to the physical properties of gases, as the gas temperature decreases, its density increases and its volume decreases. As the fluid temperature increases, its density decreases and its volume increases.

[0059] As a heat exchange element, a heat exchanger maintains a constant mass flow rate. The temperature difference between the cold fluid and the heated fluid after heat exchange at the heat exchanger's inlet and outlet is large, causing significant changes in the heat exchanger's inlet and outlet areas. Common heat exchangers utilize a welded structure with multiple rows of tubes arranged with one inlet and one outlet. This arrangement results in a sparse arrangement of flat tubes at the heat exchanger's outlet, resulting in low space utilization. The heat exchanger of the present invention adds a manifold structure between the inlet and outlet flat tubes. This manifold rearranges the number of heat exchanger outlets, creating a "one-inlet, multiple-outlet" flat tube arrangement that achieves higher space utilization.

[0060] Conventional heat exchangers employ cross-flow and counter-flow configurations, often achieved through single-tube bending. The heat exchanger's inlet and outlet directions are completely customized to the site's requirements. This new heat exchanger features a separate inlet and outlet pipe design. By rotating the manifold, the inlet and outlet directions can be adjusted to the heat exchanger's fluid flow. This fully accommodates the need for on-site heat exchanger inlet and outlet directions, even on the same side, during various device modifications.

[0061] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A heat exchange tube for a plate and tube heat exchanger, characterized in that: It comprises an inlet pipe group (1), a collecting pipe (2), a first outlet pipe group (3) and a second outlet pipe group (4); The inlet pipe group (1) is composed of a plurality of inlet pipes arranged side by side, and the first outlet pipe group (3) and the second outlet pipe group (4) are both composed of a plurality of outlet pipes arranged side by side; The inlet pipe and the outlet pipe are both flat pipes, and the manifold (2) is a rectangular pipe; The plurality of inlet pipes of the inlet pipe group (1) are distributed along the length direction of the manifold (2), and the tail ends of the inlet pipes are connected to the reference side wall of the manifold (2) and communicate with the interior of the manifold (2); The plurality of outlet pipes of the first outlet pipe group (3) are distributed along the length direction of the manifold (2), and the head ends of the outlet pipes are connected to the side wall of the manifold (2) opposite to the reference side wall and communicate with the interior of the manifold (2); The plurality of outlet pipes of the second outlet pipe group (4) are distributed along the length direction of the manifold (2), and the head ends of the outlet pipes are connected to the side wall of the manifold (2) adjacent to the reference side wall and communicate with the interior of the manifold (2); The axes of the outlet pipes are arranged parallel to each other, and the axes of the inlet pipe and the outlet pipe are arranged perpendicular to each other.

2. A heat exchange tube for a plate and tube heat exchanger according to claim 1, characterized in that: The inlet pipe and the outlet pipe are both rectangular pipes.

3. The heat exchange tube for a plate-tube heat exchanger according to claim 1, characterized in that: The inlet pipe and the outlet pipe are both metal pipes with a wall thickness of 0.1-0.5 mm.

4. The heat exchange tube for a plate-tube heat exchanger according to claim 1, characterized in that: The number of inlet pipes in the inlet pipe group (1) is consistent with the number of outlet pipes in the first outlet pipe group (3) and the number of outlet pipes in the second outlet pipe group (4).

5. The heat exchange tube for a plate and tube heat exchanger according to claim 1, characterized in that: The collecting tube (2) is a square tube.

6. A heat exchange tube for a plate and tube heat exchanger according to claim 5, characterized in that: The inlet pipe forms an angle of 45° with the reference side wall, and the outlet pipe forms an angle of 45° with the corresponding side wall.

7. A heat exchange module, characterized in that: The invention comprises a tube box (5) and the heat exchange tube according to any one of claims 1 to 6, wherein the tube box (5) is provided with an inlet tube sheet (6) at the inlet tube head end corresponding to the heat exchange tube, and the inlet tube sheet (6) is provided with a plurality of inlet through holes corresponding one to one with the inlet tubes, and the tube box (5) is provided with an outlet tube sheet (7) at the outlet tube tail end corresponding to the heat exchange tube, and the outlet tube sheet (7) is provided with a plurality of outlet through holes corresponding one to one with the outlet tubes.

8. A heat exchange module according to claim 7, characterized in that: The pipe box (5) is an inverted L-shaped structure, the heat exchange pipe collecting pipe (2) is located at the corner of the pipe box (5), the heat exchange pipe inlet pipe is located in the horizontal part of the pipe box (5), and the heat exchange pipe outlet pipe is located in the vertical part of the pipe box (5).

9. A split plate-tube heat exchanger, characterized in that: The heat exchanger is assembled from multiple heat exchange modules according to claim 7 or 8.

10. The split plate-tube heat exchanger according to claim 9, characterized in that: The heat exchanger is assembled from a first heat exchange module, a second heat exchange module, and a third heat exchange module. The third heat exchange module is embedded in the notch of the second heat exchange module, and the second heat exchange module is embedded in the notch of the first heat exchange module. The interiors of the first heat exchange module, the second heat exchange module, and the third heat exchange module are interconnected. The horizontal portion of the pipe box (5) of the first heat exchange module is provided with a shell-side medium outlet (8), and the vertical portion of the pipe box (5) of the first heat exchange module is provided with a shell-side medium inlet (9).

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