Detachable and replaceable immersion type heat exchanger

Abstract

The utility model discloses a detachable and replaceable immersion type heat exchanger. All components of the immersion type heat exchanger are made of polytetrafluoroethylene. The immersion type heat exchanger comprises a supporting column and a circular heat exchange component. The circular heat exchange components are detachably connected to the supporting column in a stacked mode in the axial direction of the supporting column. Each circular heat exchange component is provided with a refrigerant inlet and a refrigerant outlet; the circular heat exchange component structurally comprises a heat exchange tube, a heat exchange tube supporting plate and a supporting column connecting plate. The heat exchange tube is a hose; the strut connecting plate is annular, and the hollow shape of the strut connecting plate corresponds to the shape of the radial section of the strut; the multiple heat exchange tube supporting plates are arranged around the center of the supporting column connecting plate in a radial shape. The head end of each heat exchange tube supporting plate is connected to the supporting column connecting plate; a plurality of heat exchange tube connecting structures are arranged on the heat exchange tube supporting plate and arranged in the radius direction of the supporting column connecting plate. And the heat exchange tubes are spirally wound on the heat exchange tube supporting plates to form a disc-shaped structure.

Description

Technical Field

[0001] The utility model relates to a heat exchanger technology, in particular to a detachable and replaceable immersed heat exchanger. Background Art

[0002] Heat exchanger is a special industrial equipment, which refers to the equipment for heat exchange between the fluids being exchanged. It has many applications in equipment cooling. With the development of industry, the research and development potential of heat exchangers is huge. First of all, heat exchangers have a very wide range of applications. They are mainly used in chemical, petroleum, building materials, metallurgy, electric power, light industry and other industries, and can meet the different needs of various industries. Secondly, heat exchangers have also made great progress in technology, and their installation structure and heat transfer efficiency have been greatly improved. Domestic and foreign researchers have conducted extensive research on the heat transfer performance, structural optimization, and new material application of heat exchangers. In terms of heat transfer performance, researchers have conducted in-depth analysis of the flow and heat transfer process inside the heat exchanger through experimental and numerical simulation methods to improve the heat exchange efficiency.

[0003] The main function of a heat exchanger is to transfer heat energy from one medium to another to achieve the process of heating, cooling or condensing. In the application scenario of tinning machine electrolyte, the existing immersion heat exchanger has the following defects:

[0004] 1) The heat exchanger needs to be used in the tinning machine electrolyte (acidic environment). Most existing immersion heat exchangers use metal tubes bent into various shapes that are suitable for the container and immersed in the container. A few immersion heat exchangers use coils to achieve the purpose of high pressure resistance and corrosion resistance, but the turbulence of the liquid in the container is low and the heat transfer coefficient outside the tube is small. Existing immersion heat exchangers generally cannot meet the use environment of tinning machine electrolyte;

[0005] 2) The immersed heat exchanger is immersed in the electrolyte for a long time, and acid scale is easily accumulated on the surface, which affects the heat exchange effect. It is common to shut down the machine for cleaning every three months, and due to the integrated structure, only the acid scale attached to the surface can be cleaned. Most of the scale on the inner layer of the heat exchanger cannot be cleaned. As the use time increases, the heat exchange effect will be greatly reduced even if it is cleaned regularly;

[0006] 3) Since cooling water is used for cooling, the problem of scale clogging the pipes will occur after long-term use. Even if soft water is used, it can only alleviate the scale problem, and it will clog the pipes after a long time, and increase the cost of equipment. Once the pipe is clogged, the heat exchange effect will be reduced. Secondly, due to the integrated design, the heat exchanger will be scrapped after the pipe is clogged and needs to be repurchased.

[0007] Through the above description, the technical problems that need to be solved by the invention mainly include: the heat exchanger cannot meet the requirements of long-term operation under acidic conditions; the heat exchange effect of the integrated heat exchanger decreases after fouling; and the entire heat exchanger is scrapped after the refrigerant pipeline of the integrated heat exchanger is blocked. Summary of the invention

[0008] In order to solve the above problems existing in the prior art, the present invention proposes a detachable and replaceable immersed heat exchanger.

[0009] All components of the immersed heat exchanger of the utility model are made of polytetrafluoroethylene;

[0010] The immersed heat exchanger includes: a support, a circular heat exchange component, a refrigerant inlet mechanism and a refrigerant outlet mechanism;

[0011] There are a plurality of identical circular heat exchange components, which are detachably connected to the support in a stacked manner along the axial direction of the support; the refrigerant inlet and refrigerant outlet of each circular heat exchange component are respectively connected to the refrigerant inlet mechanism and the refrigerant outlet mechanism;

[0012] The structure of the circular heat exchange component includes: a heat exchange tube, a heat exchange tube support plate and a support connecting plate; the heat exchange tube is a hose;

[0013] The support connecting plate is annular, and the hollow shape of the support connecting plate corresponds to the outer shape of the radial cross section of the support;

[0014] There are multiple heat exchange tube support plates, which are radially arranged around the center of the support connecting plate; the head end of each heat exchange tube support plate is connected to the support connecting plate; there are multiple heat exchange tube connection structures on the heat exchange tube support plate, and each heat exchange tube connection structure is arranged along the radial direction of the support connecting plate; the heat exchange tube is spirally wound around each heat exchange tube support plate and connected to the heat exchange tube connection structure to form a disc-shaped structure.

[0015] The whole machine of the immersed heat exchanger selects polytetrafluoroethylene as the heat exchanger material, which can better solve the problem of the heat exchanger working under acidic conditions.

[0016] To solve the problem of reduced heat exchange effect after scaling of the integrated heat exchanger: the heat exchange tubes are arranged to form a disc spiral structure. Under the premise of not affecting the heat exchange volume, the spacing between the heat exchange tubes is increased (the spacing range is generally 6 to 9 mm), which greatly reduces the possibility of electrolyte scaling.

[0017] At the same time, the heat exchange tube is connected with a single-layer spiral connection, and is installed layer by layer on this basis, so that the temperature of the cooling water (cooling water) will not be increased due to the temperature of the electrolyte during the flow of the refrigerant (cooling water), thereby optimizing the heat exchange effect.

[0018] In order to solve the problem of replacing the whole machine after the integrated heat exchanger pipeline is blocked: multiple circular heat exchange components are stacked.

[0019] Furthermore, the axes of the heat exchange tubes on the circular heat exchange component are on the same plane, which can improve the heat exchange effect.

[0020] Specifically, the pillar and the pillar connecting plate of the circular heat exchange component are connected by a key structure. Alternatively, the pillar is cylindrical and the hollow of the pillar connecting plate is circular. Both connection structures are applicable to the present invention. For the case where the circular heat exchange component has a large number of layers, the key structure is conducive to a neat structure and facilitates the connection of each heat exchange tube with the refrigerant access mechanism and the refrigerant outlet mechanism. If the circular heat exchange component has a small number of layers, a demanding structure is not required.

[0021] Specifically, the upper and bottom parts of the pillar are connected with an upper cap and a lower cap, the outer diameters of the upper cap and the lower cap are larger than the outer diameter of the pillar; the lower cap supports the bottom circular heat exchange component, and the upper cap presses the top circular heat exchange component; the upper cap is detachably connected to the pillar.

[0022] Furthermore, a lifting ring connection mechanism (a threaded deep hole for detachably connecting a lifting ring) is provided on the top of the pillar.

[0023] Specifically, the heat exchange tube support plate is in a rectangular shape, and through holes for the heat exchange tubes to pass through are opened on the main body of the heat exchange tube support plate as a heat exchange tube connection structure; gaps are left between adjacent through holes, and the width of the gaps is 6 to 9 mm.

[0024] Specifically, the refrigerant inlet mechanism and the refrigerant outlet mechanism are flanges respectively;

[0025] The first and last ends of the heat exchange tubes of each circular heat exchange component are bent upwards and extend out of the top surface of the circular heat exchange component on the uppermost layer;

[0026] Each heat exchange tube is connected to a flange at both ends;

[0027] For any flange, the end of the heat exchange tube extends into the flange and is sealed and connected, and the end face of the heat exchange tube is flush with the end face of the flange.

[0028] Furthermore, the diameter (inner diameter) of the heat exchange tube is 4.0-4.5 mm, and the wall thickness is 0.75-1.0 mm.

[0029] Advantages of the invention:

[0030] 1. Low maintenance cost and good replaceability: Compared with the previous maintenance and replacement of the entire machine after the pipeline is blocked, the present invention only needs to find out which piece of the blocked pipeline is and replace the blocked pipeline, which greatly reduces the maintenance cost.

[0031] 2. High heat exchange efficiency and not easy to scale: The disc spiral structure is used to increase the distance between the pipes, reduce the possibility of scale accumulation, and optimize the heat exchange pipe path to improve the heat exchange efficiency.

[0032] 3. Wide range of applications: The use of polytetrafluoroethylene materials with high temperature resistance, excellent chemical stability and good insulation properties enables the heat exchanger to operate in harsh environments such as high temperature, acid and alkalinity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the axial section of the immersed heat exchanger in use, and the arrow direction in the figure is the flow direction of the refrigerant (cooling water);

[0034] Figure 2 It is a top view schematic diagram of the immersion heat exchanger;

[0035] Figure 3 This is an axial schematic diagram of a single circular heat exchange component.

[0036] Figure 4 It is a schematic diagram of the axial section of the flange part;

[0037] Figure 5 It is a schematic diagram of the end face of the flange part;

[0038] In the figure: support 1, circular heat exchange component 2, heat exchange tube 3, heat exchange tube support plate 4, support connecting plate 5, heat exchange tube connecting structure, i.e. through hole 6, upper cap 7, lower cap 8, lifting ring 9, flange 10, and upwardly bent parts 11 of the heat exchange tube at both ends. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] refer to Figure 1 and Figure 2 , a removable and replaceable immersed heat exchanger, all components of the immersed heat exchanger are made of polytetrafluoroethylene;

[0041] The immersed heat exchanger comprises: a support 1, a circular heat exchange component 2, a refrigerant inlet mechanism and a refrigerant outlet mechanism;

[0042] There are multiple identical circular heat exchange components 2, which are detachably connected to the support 1 in a stacked manner along the axial direction of the support; the refrigerant inlet and refrigerant outlet of each circular heat exchange component are respectively connected to the refrigerant inlet mechanism and the refrigerant outlet mechanism;

[0043] The structure of the circular heat exchange component 2 includes: a heat exchange tube 3, a heat exchange tube support plate 4 and a support connecting plate 5; the heat exchange tube 3 is a hose;

[0044] The support connecting plate 5 is annular, and the hollow shape of the support connecting plate corresponds to the outer shape of the radial cross section of the support;

[0045] There are multiple heat exchange tube support plates 4, which are radially arranged around the center of the support connecting plate; the head end of each heat exchange tube support plate is connected to the support connecting plate; there are multiple heat exchange tube connection structures (through holes 6 in this example) on the heat exchange tube support plate, and each heat exchange tube connection structure is arranged along the radial direction of the support connecting plate; the heat exchange tube is spirally wound around each heat exchange tube support plate and connected to the heat exchange tube connection structure to form a disc-shaped structure.

[0046] The axes of the heat exchange tubes on the circular heat exchange component are in the same plane.

[0047] The support and the support connecting plate of the circular heat exchange component are connected by a key structure. Alternatively, the support is cylindrical and the hollow of the support connecting plate is circular. This example adopts the latter.

[0048] The upper and lower parts of the pillar are connected with an upper cap 7 and a lower cap 8, the outer diameters of which are larger than the outer diameter of the pillar; the lower cap supports the bottom circular heat exchange component, and the upper cap presses the top circular heat exchange component; the upper cap is detachably connected to the pillar. The upper cap 7 and the lower cap 8 are both cap nuts, which are screwed to the threads at the corresponding positions outside the pillar.

[0049] The top of the support 1 is provided with a lifting ring connection mechanism (for connecting the countersunk screw hole of the lifting ring 9).

[0050] In this example, the heat exchange tube support plate 4 is in a rectangular shape, and a through hole 6 for the heat exchange tube to pass through is opened on the main body of the heat exchange tube support plate as a heat exchange tube connection structure; a gap is left between adjacent through holes 6.

[0051] The refrigerant inlet mechanism and the refrigerant outlet mechanism are flanges 10 respectively.

[0052] refer to Figure 3 The head and tail ends of the heat exchange tubes 3 of each circular heat exchange component are bent upwards and extend out of the top surface of the circular heat exchange component on the uppermost layer; the head and tail ends of each heat exchange tube are connected to a flange respectively.

[0053] refer to Figure 4 and Figure 5 For any flange 10, the end of the heat exchange tube extends into the flange and is sealed and connected, and the end face of the heat exchange tube is flush with the end face of the flange.

[0054] In this embodiment, the micro-tube circular holes (i.e., through holes 6) are arranged to form a disc spiral structure, which greatly reduces the possibility of electrolyte scaling. 36 circular heat exchange components are stacked. A circular heat exchange component includes:

[0055] The circular plate with a diameter of 100mmx60mmx12mm (i.e. the pillar connecting plate 5, whose dimensions are 100mm outer diameter, 60mm inner diameter and 12mm thickness) has 6 mounting threaded holes evenly distributed around it.

[0056] 6 pieces of 270mmx12mmx6mm rectangular plates with the same threads as the front end of the circular ring plate (i.e., heat exchange tube support plates 4, with dimensions of 270mm in length, 12mm in width, and 6mm in height), each plate having 19 through holes (i.e., through holes 6);

[0057] The heat exchange tube has a total length of 25m; the heat exchange tube's inlet and outlet parts each leave a 2mm installation dimension (i.e. the upwardly bent parts 11 at both ends of the heat exchange tube, etc.) for connecting flanges, etc.

[0058] In this example, the support is made of polytetrafluoroethylene; the heat exchange tube, the heat exchange tube support plate and the support connecting plate are all made of polytetrafluoroethylene; the flange is made of polytetrafluoroethylene; the upper cap and the lower cap are both made of polytetrafluoroethylene; the material of the lifting ring is A3 steel (the current grade is Q235).

[0059] In order to meet the acidic immersion environment of the electrolyte, the heat exchanger adopts an immersed structure and uses polytetrafluoroethylene as the material.

[0060] In order to obtain better heat exchange efficiency, the traditional integrated heat exchange path from top to bottom is changed to a single-layer spiral access. The cooling water is less affected from inflow to outflow, and the cooling effect is improved.

[0061] In order to prevent the problem of reduced heat exchange efficiency caused by fouling, a disc spiral structure with round tubes is adopted to increase the spacing between the heat exchange tubes and reduce the fouling rate.

[0062] To achieve replaceability, the integrated structure is changed to a multi-layer (36 layers in this case) circular heat exchange component assembly. If any layer is blocked, the corresponding layer can be found and replaced.

[0063] The circular heat exchange component is mounted on the support structure.

[0064] The following table compares the effects before and after using this heat exchanger.

[0065]

[0066] Technical description:

[0067] Heat exchange tubes made of acid-resistant steel are suitable for sulfate-type (oxidizing acid) acid tinning electrolytes, but not for chloride-type (reducing acid) acid tinning electrolytes.

[0068] Heat exchange tubes made of polytetrafluoroethylene are widely used in acidic tinning electrolytes such as sulfate and hydrochloride. The service life of polytetrafluoroethylene in highly corrosive media is 20 to 30 times that of acid-resistant steel.

[0069] In order to improve the heat exchange effect of the PTFE heat exchange tube, the diameter (inner diameter) of the PTFE heat exchange tube is 4.0-4.5mm, and the wall thickness is 0.75-1.0mm. The specific small diameter and thin wall tube, combined with the characteristic of no temperature gradient of the PTFE heat exchange tube, overcomes the disadvantage of low thermal conductivity of the material, and makes its total heat transfer coefficient meet the use requirements of the heat exchanger.

[0070] Because of the chemical inertness, surface smoothness, flexibility and high expansion coefficient of polytetrafluoroethylene, it is difficult for its heat transfer surface to scale, ensuring a relatively stable heat transfer coefficient.

[0071] Because polytetrafluoroethylene has a very small friction coefficient, low roughness and excellent lubrication performance, the resistance of the refrigerant fluid in the pipe is smaller than that of a metal pipe.

Claims

1. A detachable and replaceable immersed heat exchanger, characterized in that All components of the immersed heat exchanger are made of polytetrafluoroethylene; The immersed heat exchanger includes: a support, a circular heat exchange component, a refrigerant inlet mechanism and a refrigerant outlet mechanism; There are a plurality of identical circular heat exchange components, which are detachably connected to the support in a stacked manner along the axial direction of the support; the refrigerant inlet and refrigerant outlet of each circular heat exchange component are respectively connected to the refrigerant inlet mechanism and the refrigerant outlet mechanism; The structure of the circular heat exchange component includes: a heat exchange tube, a heat exchange tube support plate and a support connecting plate; the heat exchange tube is a hose; The support connecting plate is annular, and the hollow shape of the support connecting plate corresponds to the outer shape of the radial cross section of the support; There are multiple heat exchange tube support plates, which are radially arranged around the center of the support connecting plate; the head end of each heat exchange tube support plate is connected to the support connecting plate; there are multiple heat exchange tube connection structures on the heat exchange tube support plate, and each heat exchange tube connection structure is arranged along the radial direction of the support connecting plate; the heat exchange tube is spirally wound around each heat exchange tube support plate and connected to the heat exchange tube connection structure to form a disc-shaped structure.

2. The detachable and replaceable immersed heat exchanger according to claim 1 is characterized in that The axes of the heat exchange tubes on the circular heat exchange component are in the same plane.

3. The detachable and replaceable immersed heat exchanger according to claim 1 is characterized in that The support column and the support column connecting plate of the circular heat exchange component are connected via a key structure.

4. The detachable and replaceable immersed heat exchanger according to claim 1 is characterized in that The support column is cylindrical in shape, and the hollow of the support column connecting plate is circular.

5. The detachable and replaceable immersed heat exchanger according to claim 1 is characterized in that The upper and lower parts of the pillar are connected with an upper cap and a lower cap, the outer diameters of which are larger than the outer diameter of the pillar; the lower cap supports the bottom circular heat exchange component, and the upper cap presses the top circular heat exchange component; the upper cap is detachably connected to the pillar.

6. The detachable and replaceable immersed heat exchanger according to claim 1 is characterized in that A lifting ring connection mechanism is arranged on the top of the pillar.

7. The detachable and replaceable immersed heat exchanger according to claim 1 is characterized in that The heat exchange tube support plate is in a rectangular parallelepiped shape, and through holes for the heat exchange tubes to pass through are opened on the main body of the heat exchange tube support plate as a heat exchange tube connection structure; gaps are left between adjacent through holes.

8. The detachable and replaceable immersed heat exchanger according to claim 1, characterized in that The refrigerant inlet mechanism and the refrigerant outlet mechanism are flanges respectively; The first and last ends of the heat exchange tubes of each circular heat exchange component are bent upwards and extend out of the top surface of the circular heat exchange component on the uppermost layer; Each heat exchange tube is connected to a flange at both ends; For any flange, the end of the heat exchange tube extends into the flange and is sealed and connected, and the end face of the heat exchange tube is flush with the end face of the flange.

9. The detachable and replaceable immersed heat exchanger according to claim 1, characterized in that The inner diameter of the heat exchange tube is 4.0-4.5 mm, and the wall thickness is 0.75-1.0 mm.

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