Tube-on-sheet heat exchanger

Abstract

The invention discloses a tube-on-sheet heat exchanger. The tube-on-sheet heat exchanger comprises a plurality of heat exchange modules which are assembled together and have different sizes. The heat exchange module comprises a tube box and heat exchange tubes arranged in the tube box. The heat exchange tubes comprise an inlet tube set, a collecting tube, a first outlet tube set and a second outlet tube set. 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. The collecting tube structure is added between the inlet flat tube and the outlet flat tube of the heat exchange tube of the heat exchanger, the number of outlets of the heat exchanger is rearranged through the collecting tube, namely a one-inlet multi-outlet flat tube structure is adopted for arrangement, 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 invention relates to the technical field of heat exchange equipment, and in particular to a plate-tube heat exchanger. Background Art

[0002] Plate and tube heat exchangers belong to shell and tube heat exchangers and are widely used in industrial fields such as petrochemicals and nuclear power. They are mainly used to achieve heat transfer between different fluids, thereby achieving cooling and / or heating of the fluids. Plate and tube heat exchangers are usually composed of shells, heat transfer tube bundles, tube sheets, baffles (baffles) and tube boxes. The shell is mostly cylindrical, with tube bundles inside, and both ends of the tube bundles are fixed to the tube sheets. The two fluids that exchange heat in the shell and tube heat exchanger, one flows in the tube bundle, and its flow channel is the tube side; the other fluid flows inside the shell and outside the tube bundle, and its flow space is the shell side.

[0003] However, common heat exchangers are welded structures with multiple rows of tubes arranged in one inlet and one outlet. This arrangement makes the flat tube structure of the heat exchanger outlet sparsely arranged, and the space utilization rate is low. In addition, the cross-flow and counter-flow structures of existing common heat exchangers are all achieved by bending a single tube. The inlet and outlet directions of the heat exchanger need to be completely customized according to the site direction, which is not flexible enough. Summary of the invention

[0004] The purpose of the present invention is to provide a plate-tube heat exchanger to solve the technical problems of low space utilization and inflexible adjustment of the inlet and outlet directions of the plate-tube heat exchanger in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a plate-tube heat exchanger, comprising a plurality of heat exchange modules of different sizes assembled together;

[0006] The heat exchange module includes a pipe box and heat exchange pipes built in the pipe box;

[0007] The heat exchange tubes include an inlet tube group, a collecting tube, a first outlet tube group and a second outlet tube group;

[0008] The inlet pipe group is composed of a plurality of inlet pipes arranged side by side, the first outlet pipe group and the second outlet pipe group are both composed of a plurality of outlet pipes arranged side by side, and both the inlet pipe and the outlet pipe are flat square pipes;

[0009] The manifold is a square tube, and the multiple inlet tubes of the inlet tube group are distributed along the length direction of the manifold, and the tail ends of the inlet tubes are connected to the reference side wall of the manifold and communicated with the interior of the manifold;

[0010] 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;

[0011] 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 communicated with the interior of the manifold;

[0012] The inlet pipe forms an angle of 45° with the reference side wall, the outlet pipe forms an angle of 45° with the corresponding side wall, and the outlet pipes of the first outlet pipe group and the outlet pipes of the second outlet pipe group are oriented in the same direction;

[0013] The pipe box is 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, the outlet pipe of the heat exchange pipe is located in the vertical part of the pipe box, the pipe box is provided with an inlet tube sheet at the head end of the inlet pipe corresponding to the heat exchange pipe, and the inlet tube sheet is provided with a plurality of inlet through holes corresponding to the inlet pipes one by one, and the pipe box is provided with an outlet tube sheet at the tail end of the outlet pipe corresponding to the heat exchange pipe, and the outlet tube sheet is provided with a plurality of outlet through holes corresponding to the outlet pipes one by one;

[0014] The interiors of the pipe boxes of the plurality of heat exchange modules are interconnected, and a shell-side medium inlet and a shell-side medium outlet are provided on one of the pipe boxes.

[0015] As a further optimization of a plate-tube heat exchanger of the present invention: the heat exchanger consists of a first heat exchange module and a second heat exchange module, the second heat exchange module is embedded in the notch of the first heat exchange module, the horizontal part of the tube box of the first heat exchange module is provided with a shell-side medium outlet, and the vertical part of the tube box of the first heat exchange module is provided with a shell-side medium inlet.

[0016] As a further optimization of a plate-tube heat exchanger of the present invention: 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, the second heat exchange module is embedded in the notch of the first heat exchange module, the horizontal part of the tube box of the first heat exchange module is provided with a shell-side medium outlet, and the vertical part of the tube box of the first heat exchange module is provided with a shell-side medium inlet.

[0017] As a further optimization of a plate-tube heat exchanger of the present invention: the connecting end faces of the inlet tube sheets of the first heat exchange module, the second heat exchange module and the third heat exchange module are step surfaces, adjacent inlet tube sheets are buckled together through the step surfaces, and the connecting end faces are sealed by applying high-temperature sealant with inorganic material.

[0018] As a further optimization of the plate-tube heat exchanger of the present invention: the inorganic material is a refractory ceramic fiber gasket.

[0019] As a further optimization of the plate-tube heat exchanger of the present invention, adjacent inlet tube sheets are fastened by bolts passing through the step surface.

[0020] As a further optimization of the plate-tube heat exchanger of the present invention: the inlet pipe and the outlet pipe are both metal pipes with a wall thickness of 0.1-0.5 mm.

[0021] As a further optimization of the plate-tube heat exchanger of the present invention: the spacing between adjacent inlet tubes in the inlet tube group is.

[0022] As a further optimization of the plate-tube heat exchanger of the present invention: the spacing between adjacent outlet pipes in the first outlet pipe group and the second outlet pipe group is.

[0023] As a further optimization of the plate-tube heat exchanger of the present invention: a connecting flange for assembly is provided on the tube box.

[0024] The present invention has the following beneficial effects:

[0025] 1. The heat exchange tubes of the heat exchanger of the present invention have a collecting tube structure added between the inlet and outlet flat tubes, and the number of heat exchanger outlets is rearranged through the collecting tube, that is, a "one inlet and multiple outlets" flat tube structure is adopted to achieve higher space utilization;

[0026] 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 can fully adapt to the problem of different inlet and outlet directions and the same side adaptation of the fluid in the on-site heat exchanger when various devices are modified. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the heat exchange tube of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the collecting tube in the heat exchange tube of the present invention;

[0029] Figure 3 Schematic diagram of the external structure of the heat exchanger (two modules) of the present invention;

[0030] Figure 4 Schematic diagram of the internal structure of the heat exchanger (two modules) of the present invention;

[0031] Figure 5 Schematic diagram of the external structure of the heat exchanger (three modules) of the present invention;

[0032] Markings in the figure:

[0033] 1. Pipe box;

[0034] 2. Heat exchange tube;

[0035] 201, Imported pipe group;

[0036] 202, collecting tube;

[0037] 203, first outlet pipe group;

[0038] 204, second outlet pipe group;

[0039] 3. Export tube sheet;

[0040] 4. Imported tube sheet;

[0041] 5. Shell side medium inlet;

[0042] 6. Shell side medium outlet. DETAILED DESCRIPTION

[0043] 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.

[0044] Example 1

[0045] like Figure 1-4 Shown: A plate-tube heat exchanger is assembled from a first heat exchange module and a second heat exchange module.

[0046] The heat exchange module includes a tube box 1 and heat exchange tubes 2 built in the tube box 1. The heat exchange tubes 2 include an inlet tube group 201, a collection tube 202, a first outlet tube group 203 and a second outlet tube group 204.

[0047] The inlet pipe group 201 is composed of a plurality of inlet pipes arranged side by side, the first outlet pipe group 203 and the second outlet pipe group 204 are both composed of a plurality of outlet pipes arranged side by side, and both the inlet pipes and the outlet pipes are flat square pipes. The manifold 202 is a square pipe, and the plurality of inlet pipes of the inlet pipe group 201 are distributed along the length direction of the manifold 202, and the tail ends of the inlet pipes are connected to the reference side wall of the manifold 202 and communicate with the interior of the manifold 202.

[0048] The reasons for using flat square tubes for inlet and outlet pipes are as follows: ① Round steel with the same unit volume occupies more space than rectangular flat tubes, making it difficult to improve space utilization and reduce equipment volume and weight, and the cost will be higher. ② Using round tubes requires opening oblique circular holes on the inclined surface of the manifold, which is not as convenient to manufacture as opening rectangular flat holes in the manifold, and the quality of rectangular welds is more guaranteed than that of intersecting line welds.

[0049] 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).

[0050] 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.

[0051] The multiple outlet pipes of the first outlet pipe group 203 are distributed along the length direction of the manifold 202, and the head ends of the outlet pipes are connected to the side wall of the manifold 202 opposite to the reference side wall and communicate with the interior of the manifold 202. The multiple outlet pipes of the second outlet pipe group 204 are distributed along the length direction of the manifold 202, and the head ends of the outlet pipes are connected to the side wall of the manifold 202 adjacent to the reference side wall and communicate with the interior of the manifold 202.

[0052] The spacing between adjacent inlet tubes in the inlet tube group 201 is , and the spacing between adjacent outlet tubes in the first outlet tube group 203 and the second outlet tube group 204 is .

[0053] The reference side wall is only a definition, and 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.

[0054] The inlet pipe forms an angle of 45° with the reference side wall, the outlet pipe forms an angle of 45° with the corresponding side wall, and the outlet pipes of the first outlet pipe group 203 and the outlet pipes of the second outlet pipe group 204 are oriented in the same direction.

[0055] The pipe box 1 is an inverted L-shaped structure, and a connecting flange for assembly is provided on the pipe box 1. The manifold 202 of the heat exchange tube 2 is located at the corner of the pipe box 1, the inlet pipe of the heat exchange tube 2 is located in the horizontal part of the pipe box 1, and the outlet pipe of the heat exchange tube 2 is located in the vertical part of the pipe box 1. The pipe box 1 is provided with an inlet tube sheet 4 at the head end of the inlet pipe corresponding to the heat exchange tube 2, and the inlet tube sheet 4 is provided with a plurality of inlet through holes corresponding to the inlet pipes one by one. The pipe box 1 is provided with an outlet tube sheet 3 at the tail end of the outlet pipe corresponding to the heat exchange tube 2, and the outlet tube sheet 3 is provided with a plurality of outlet through holes corresponding to the outlet pipes one by one.

[0056] The second heat exchange module is embedded in the notch of the first heat exchange module. The horizontal portion of the pipe box 1 of the first heat exchange module is provided with a shell-side medium outlet 6, and the vertical portion of the pipe box 1 of the first heat exchange module is provided with a shell-side medium inlet 5.

[0057] Example 2

[0058] like Figure 5 As shown: a plate-tube 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, the second heat exchange module is embedded in the notch of the first heat exchange module, the horizontal part of the tube box 1 of the first heat exchange module is provided with a shell-side medium outlet 6, and the vertical part of the tube box 1 of the first heat exchange module is provided with a shell-side medium inlet 5.

[0059] The connecting end faces of the inlet tube sheets 4 of the first heat exchange module, the second heat exchange module and the third heat exchange module are step surfaces, and adjacent inlet tube sheets 4 are buckled together through the step surfaces. The connecting end faces are sealed by applying high-temperature sealant with refractory ceramic fiber gaskets.

[0060] The adjacent inlet tube sheets 4 are fastened by bolts passing through the stepped surface. The bolts are tightened to ensure the sealing of the shell after the end plates are connected, so that the end faces of multiple heat exchange modules are in the same plane, which is convenient for peripheral flange connection.

[0061] The inlet tube group 201 and the outlet tube group 204 are matched with the inlet tube sheet 4 and the outlet tube sheet 3 with a clearance of 1-1.5mm. The tube groups are inserted into the tube sheets and welded when the outer end faces are flush, which is conducive to ensuring the convenience of construction and leak detection, as well as leak repair welding.

[0062] During heat exchange, the high-temperature flue gas enters the tube box from the medium inlet of the vertical part 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 medium outlet of the horizontal part of the tube box of the first heat exchange module. The air enters the heat exchange tube from the inlet tube sheet of the first heat exchange module, the second heat exchange module, and the third heat exchange module, flows downward along the inside of the heat exchange tube, exchanges heat with the high-temperature flue gas in the shell side inside the tube box, and finally flows out from the outlet tube sheet of the first heat exchange module, the second heat exchange module, and the third heat exchange module.

[0063] When the fluid mass flow rate is constant, the area through which the fluid passes through 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. According to the physical properties of the gas, the density increases and the volume decreases when the gas temperature decreases. The density decreases and the volume increases when the fluid temperature increases.

[0064] As a heat exchange element, when the mass flow rate of the fluid passing through the heat exchanger remains unchanged, the temperature difference between the cold fluid and the hot fluid after heat exchange at the inlet and outlet of the heat exchanger is large, which causes a large change in the inlet and outlet area of ​​the heat exchanger. Common heat exchangers are welded in a multi-row tube-inlet-outlet arrangement. This arrangement makes the flat tube structure of the heat exchanger outlet sparsely arranged, and the space utilization rate is low. The heat exchanger of the present invention adds a manifold structure between the inlet and outlet flat tubes, and rearranges the number of heat exchanger outlets through the manifold, that is, adopts a "one inlet and multiple outlets" flat tube structure arrangement to achieve higher space utilization.

[0065] The cross-flow and counter-flow structures of common heat exchangers are all realized by bending a single pipe, and the inlet and outlet directions of the heat exchanger are completely customized according to the site direction. The heat exchanger of the present invention separates the fluid inlet and outlet pipes into a separate structure design, and the inlet and outlet directions of the heat exchanger fluid can be adapted by rotating the direction of the manifold, which can fully adapt to the problem of different inlet and outlet directions and the same side adaptation of the fluid on-site heat exchangers when various devices are modified.

[0066] 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 plate-tube heat exchanger, characterized in that: It includes a plurality of heat exchange modules of different sizes assembled together; The heat exchange module comprises a pipe box (1) and heat exchange pipes (2) built into the pipe box (1); The heat exchange tube (2) comprises an inlet tube group (201), a collecting tube (202), a first outlet tube group (203) and a second outlet tube group (204); The inlet pipe group (201) is composed of a plurality of inlet pipes arranged side by side, the first outlet pipe group (203) and the second outlet pipe group (204) are both composed of a plurality of outlet pipes arranged side by side, and both the inlet pipes and the outlet pipes are flat square pipes; The manifold (202) is a square tube, and the multiple inlet tubes of the inlet tube group (201) are distributed along the length direction of the manifold (202), and the tail ends of the inlet tubes are connected to the reference side wall of the manifold (202) and communicated with the interior of the manifold (202); The plurality of outlet pipes of the first outlet pipe group (203) are distributed along the length direction of the manifold (202), and the head ends of the outlet pipes are connected to the side wall of the manifold (202) opposite to the reference side wall and are in communication with the interior of the manifold (202); The plurality of outlet pipes of the second outlet pipe group (204) are distributed along the length direction of the manifold (202), and the head ends of the outlet pipes are connected to the side wall of the manifold (202) adjacent to the reference side wall and are in communication with the interior of the manifold (202); The inlet pipe forms an angle of 45° with the reference side wall, the outlet pipe forms an angle of 45° with the corresponding side wall, and the outlet pipes of the first outlet pipe group (203) and the outlet pipes of the second outlet pipe group (204) are oriented in the same direction; The pipe box (1) is in an inverted L-shaped structure, the collecting pipe (202) of the heat exchange tube (2) is located at the corner of the pipe box (1), the inlet pipe of the heat exchange tube (2) is located in the horizontal part of the pipe box (1), and the outlet pipe of the heat exchange tube (2) is located in the vertical part of the pipe box (1). The pipe box (1) is provided with an inlet tube sheet (4) at the head end of the inlet pipe corresponding to the heat exchange tube (2), and the inlet tube sheet (4) is provided with a plurality of inlet through holes corresponding to the inlet pipes one by one. The pipe box (1) is provided with an outlet tube sheet (3) at the tail end of the outlet pipe corresponding to the heat exchange tube (2), and the outlet tube sheet (3) is provided with a plurality of outlet through holes corresponding to the outlet pipes one by one. The interiors of the pipe boxes (1) of the plurality of heat exchange modules are interconnected, and a shell-side medium inlet (5) and a shell-side medium outlet (6) are provided on one of the pipe boxes (1).

2. A plate-tube heat exchanger according to claim 1, characterized in that: The heat exchanger comprises a first heat exchange module and a second heat exchange module, wherein the second heat exchange module is embedded in the notch of the first heat exchange module, the horizontal portion of the pipe box (1) of the first heat exchange module is provided with a shell-side medium outlet (6), and the vertical portion of the pipe box (1) of the first heat exchange module is provided with a shell-side medium inlet (5).

3. A plate-tube heat exchanger according to claim 1, 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. The second heat exchange module is embedded in the notch of the first heat exchange module. The horizontal part of the pipe box (1) of the first heat exchange module is provided with a shell-side medium outlet (6), and the vertical part of the pipe box (1) of the first heat exchange module is provided with a shell-side medium inlet (5).

4. A plate-tube heat exchanger according to claim 3, characterized in that: The connecting end faces of the inlet tube sheets (4) of the first heat exchange module, the second heat exchange module and the third heat exchange module are stepped surfaces, adjacent inlet tube sheets (4) are buckled together via the stepped surfaces, and the connecting end faces are sealed by applying high-temperature sealant made of inorganic material.

5. A plate-tube heat exchanger according to claim 4, characterized in that: The inorganic material is a refractory ceramic fiber gasket.

6. A plate-tube heat exchanger according to claim 4, characterized in that: Adjacent inlet tube sheets (4) are fastened by bolts passing through the step surfaces.

7. 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.

8. A plate-tube heat exchanger according to claim 1, characterized in that: The spacing between adjacent inlet pipes in the inlet pipe group (201) is 9 to 16 mm.

9. A plate-tube heat exchanger according to claim 1, characterized in that: The spacing between adjacent outlet pipes in the first outlet pipe group (203) and the second outlet pipe group (204) is 30 to 50 mm.

10. A plate-tube heat exchanger according to claim 1, characterized in that: The pipe box (1) is provided with a connecting flange for assembly.

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