Polymer film heat exchange device

Abstract

The invention discloses a polymer film heat exchange device which comprises a heat exchange module formed by combining a plurality of heat exchange units. The heat exchange unit comprises end plates arranged on the front side and the rear side of the heat exchange unit, and heat exchange membranes are fixed between the front end plate and the rear end plate to form a plurality of sets of cold medium fluid channels. A heat medium fluid channel is defined by the rigid semi-closed shell and the outer side of the heat exchange membrane, the carrier roller tensioning adjusting device comprises an adjusting rod, a rolling tensioning carrier roller and a rolling tensioning carrier roller supporting rod, the rolling tensioning carrier roller is driven by rotating the adjusting rod to apply uniform tension to the heat exchange membrane, and tension adjustment of the heat exchange membrane is achieved; the diaphragm sealing devices are arranged at the two ends of the heat exchange diaphragm and used for achieving end sealing; the side plates are arranged on the left and right sides of the heat exchange module and used for sealing the heat medium fluid channel. According to the invention, through the heat exchange material film sheet type design, the modular supporting structure and the dynamic tensioning adjustment design, the bottleneck of low heat-conducting property of a high polymer material is overcome, and the comprehensive heat transfer coefficient is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas heat exchange, and particularly relates to a gas-gas plate heat exchange device that can be used for heat exchange of medium and high temperature gases in a highly corrosive environment. The heat exchange device uses a high-temperature resistant and corrosion-resistant polymer film as the heat exchange material, and forms a heat exchange unit by relying on a diaphragm tensioning device, a specially designed sealing structure, end plates, a frame, etc. Multiple units can be flexibly assembled into a heat exchange module according to size requirements, and a set of polymer film heat exchange devices is formed through side plate sealing, which is particularly suitable for gas-gas heat exchange in an industrial corrosive environment with phase change. Background Art

[0002] Gas-gas plate heat exchangers are key equipment in the fields of heating, ventilation, heat exchange of hot and cold gases, and heat recovery in industrial enterprises. The traditional technical routes are mainly divided into two categories: metal and non-metal. Although metal heat exchangers have high thermal conductivity, plate heat exchangers made of aluminum, copper, stainless steel, and other metal alloys have been successfully applied in the field of civil ventilation, but they are prone to pitting corrosion and blockage in industrial corrosive gas environments such as acidic, sulfur-containing, and dust-containing environments, and the equipment life is generally low. In addition, the cost of metal heat exchangers is high and the equipment self-weight is large, resulting in a significant increase in the system cost.

[0003] Non-metal heat exchangers have strong application prospects and research value in the field of gas heat exchange in industrial corrosive environments due to their excellent corrosion resistance and small structural self-weight. At present, non-metal polymer materials that have been studied and applied on plate heat exchangers include polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polypropylene (PP), fiberglass, etc. However, they still face multiple technical bottlenecks. First, the thermal conductivity of non-metal materials is low. Although the thermal conductivity can be improved step by step through composite modification means, the interfacial thermal resistance between the filler and the matrix significantly restricts the overall heat transfer efficiency, and the actual heat conduction ability has an order-of-magnitude difference from that of metal materials. Second, there are systematic shortcomings in the temperature resistance performance of the materials. The long-term thermal stability limitation of the matrix material causes the equipment to be prone to structural deformation under continuous high-temperature working conditions, restricting its application expansion in harsh temperature environments. Third, the structural design is rigid, and the rigid flow channels of metal heat exchangers (such as shell-and-tube type, flat plate type) are adopted without optimization for the low thermal conductivity characteristics of non-metals, resulting in insufficient flow channel turbulence intensity and prominent problems of ash accumulation and blockage. Fourth, there are problems with the sealing structure. Different from the welding seal that can be used for metal heat exchangers, the seals between non-metal heat exchange materials and between the heat exchange materials and the frame mostly use sealing materials or adhesive seals, and their sealing effects limit the application of non-metal heat exchange in scenarios with strict air leakage rate control. Summary of the Invention

[0004] The object of the present invention is to provide a polymer film heat exchange device, which solves the problems of poor corrosion resistance and large self-weight of metal heat exchangers, as well as large thickness of heat exchange materials, low heat transfer coefficient and poor temperature resistance of traditional non-metal heat exchangers through the design of the thickness of heat exchange membranes, modular structure and dynamic tension adjustment technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a polymer film heat exchange device, including at least one heat exchange module, which is formed by combining a plurality of heat exchange units; the length and height of the heat exchange unit can be customized according to actual needs, and the size of the heat exchange module is determined by the size of the heat exchange unit and the number of units under the condition of ensuring the convenience of installation and disassembly, and the heat exchange device supports the series and parallel expansion of multiple modules; the heat exchange unit includes: End plates, arranged on the front and back sides of the heat exchange unit, with strip-shaped openings on the end plates as cold medium channel interfaces, rubber seal rings arranged inside the holes, and sockets on the upper part of the end plates to form the internal structure of the heat exchange module; Heat exchange membranes, thin films with a thickness of 0.05 - 1 mm, fixed between the front and back end plates to form several groups of cold medium fluid channels; Rigid semi-closed shells, enclosing with the outside of the heat exchange membranes to form hot medium fluid channels, and the cold and hot medium channels are distributed in a staggered manner and the flow directions can be interchanged; Frame rods, inserted into the sockets of the end plates, connected to the front and back end plates to form a structural framework of the heat exchange unit, and preventing structural deformation through the diagonal connections arranged on the sides; Roller tension adjustment device, including an adjustment rod, a rolling tension roller and a rolling tension roller support rod, two groups of the rolling tension rollers are vertically arranged between the front and back end plates, and the rolling tension rollers are located outside the rolling tension roller support rods; the adjustment rods are respectively connected to the ends of the frame rod and the rolling tension roller support rod, and the rolling tension rollers are driven to apply uniform tension to the heat exchange membranes by rotating the adjustment rods to realize the tension adjustment of the heat exchange membranes; Membrane sealing device, arranged at both ends of the heat exchange membranes for end sealing; Side plates, arranged on the left and right sides of the heat exchange module, used to enclose the hot medium fluid channels to form an independent sealed structure.

[0006] Preferably, the membrane sealing device includes a rotary sealing handle, a heat exchange membrane end a and a heat exchange membrane end b; the heat exchange membrane end a is fixed on the end plate; the heat exchange membrane end b is fixed on the rolling tension roller; the heat exchange membrane is wound by the rotary sealing handle to make the heat exchange membrane end a and the heat exchange membrane end b form a continuous sealed interface.

[0007] Preferably, the adjusting rod of the idler tension adjusting device is a telescopic rod body structure with double - threaded ends, which are respectively dynamically connected to the frame rod and the rolling tension idler support rod. By rotation, the rolling tension idler is driven to generate an axial displacement to adjust the gap between the adjusting end plate and the rolling tension idler.

[0008] Preferably, the rolling tension idler is sleeved on the rolling tension idler support rod and can rotate and be locked around the rolling tension idler support rod. Heat - exchange diaphragms are wound on the surfaces of two rolling tension idlers at the upper and lower positions to form an inter - layer seal for the cold medium channel.

[0009] Preferably, the heat - exchange diaphragm is made of PTFE material. Its semi - flexible structure generates irregular deformation and vibration under gas disturbance to peel off the surface attachments, realizing the self - cleaning function.

[0010] Preferably, the flow direction of the hot - medium fluid channel is set from bottom to top, and the flow direction of the cold - medium fluid channel is set from front to back, forming a cross - flow counter - current heat - exchange structure.

[0011] Preferably, the heat - exchange module is enclosed on the left and right sides by side plates and on the front and back sides by front and rear end plates to form an independent sealed unit.

[0012] Preferably, the periphery of the end plate is provided with a flanging structure, and adjacent heat - exchange units are connected through fasteners provided on the flanging, supporting the series - parallel expansion of multiple modules.

[0013] Preferably, the heat - exchange diaphragms form a continuous sealed interface through winding and inter - layer lamination, and the diaphragm tension is controlled by the equal pitch of the idler tension adjusting device.

[0014] Preferably, the cold - medium fluid channel and the hot - medium fluid channel are arranged in a staggered manner to form a semi - flexible plate - type heat - exchange structure, and the cold and hot medium channels can be interchanged.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, through the thin - film design of the heat - exchange material, the modular support structure and the dynamic tension adjustment design, the bottleneck of the low thermal conductivity of polymer materials is overcome, the overall heat - transfer coefficient is improved, and it is applicable to the heat - exchange conditions of strong corrosiveness, medium - high temperature gas - gas, especially suitable for the industrial gas heat - exchange scenarios with phase change.

[0016] 2. The semi - flexible heat - exchange thin - film material in the present invention generates irregular deformation under air - flow disturbance, can automatically peel off the surface dust and attachments, effectively avoids channel blockage, and realizes the self - cleaning function; combined with the characteristics of PTFE material, the metal support and the sealing system, the temperature resistance of the device is increased to 200 °C, and it can operate stably in corrosive media such as strong acids and strong alkalis for a long time, achieving multiple breakthroughs in efficient heat transfer, temperature resistance and corrosion resistance.

[0017] 3. The present invention adopts a plug-in modular design of end plates and frame rods, and realizes elastic adjustment of the processing scale by increasing or decreasing heat exchange units to adapt to different gas volume demand scenarios. The unique sealing system avoids cross-flow of cold and hot media; when equipment maintenance is carried out, the modular structure can be quickly disassembled, replaced, and cooperated with the self-cleaning function to greatly reduce the shutdown maintenance frequency and significantly improve the operation economy of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention.

[0019] In the drawings: Figure 1 is a schematic structural diagram of the heat exchange module of the present invention; Figure 2 is a schematic structural diagram of a single heat exchange unit of the present invention; Figure 3 is a schematic structural diagram of the end plate of the present invention; Figure 4 is a schematic structural diagram of the support frame of the present invention; Figure 5 is a schematic structural diagram of the idler tension adjustment device of the present invention; Figure 6 is a schematic structural diagram of the diaphragm sealing device of the present invention; Reference numerals in the drawings: 10, heat exchange unit; 11, side plate; 12, cold medium fluid channel; 13, hot medium fluid channel; 101, end plate; 102, strip-shaped opening; 103, rubber ring seal; 104, socket; 105, heat exchange diaphragm; 106, frame rod; 107, diagonal tension; 108, adjusting rod; 109, rolling tension idler; 110, rolling tension idler support rod; 111, idler tension adjustment device; 112, rotating seal handle; 113, heat exchange diaphragm end a; 114, heat exchange diaphragm end b; 115, diaphragm sealing device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] Embodiment 1: As Figures 1-5As shown in the figure, a polymer film heat exchange device. The temperature range that the heat exchange device can withstand is 50~200°C. It is applicable to the heat exchange conditions of strong corrosive, medium-high temperature gas-gas heat exchange, and is especially applicable to the industrial gas heat exchange scenario with phase change; it includes a heat exchange unit 10, an end plate sealing assembly and a dynamic tensioning system. Specifically, multiple heat exchange units 10 are combined in parallel through the flanging structure of the end plate 101 to form a modular heat exchange module. Each heat exchange unit 10 includes the following core components: Heat exchange unit frame structure and sealing structure: The frame rod 106 enhances the overall rigidity through the diagonal bracing 107 and forms the structural frame of the heat exchange unit with the front and rear end plates 101 to ensure the structural stability under high temperature conditions. The heat exchange membrane 105 is fixed in the strip-shaped opening 102 of the end plate. The enclosed area inside the heat exchange membrane serves as the cold medium fluid channel 12. A PTFE rubber seal 103 is embedded inside the hole for sealing between the heat exchange membrane and the end plate opening. The periphery of the end plate 101 is designed with a flanging structure, and adjacent units are fastened by bolts to achieve sealing between the heat exchange units. The outermost two units are closed by the side plates 11 on both sides to form a heat exchange module.

[0022] Heat exchange membrane channel design: The PTFE heat exchange membrane 105 with a thickness of 0.05~1 mm is tensioned by the rolling tensioning roller 109. The enclosed area inside it forms the cold medium fluid channel 12, and the outside is enclosed with a semi-closed shell to form the hot medium fluid channel 13. The cold and hot channels are arranged in a staggered manner. The hot medium flows from bottom to top, and the cold medium horizontally penetrates the channels. The heat exchange efficiency is improved through the countercurrent design. The PTFE polymer material is used, which has excellent corrosion resistance and heat resistance, and is applicable to the heat exchange of corrosive gases with phase change. The high heat transfer coefficient of phase change heat transfer is fully utilized. The polymer membrane sheet designed with thin plates is used as the heat exchange plate sheet, which can minimize the thermal conduction resistance to the greatest extent and ensure the optimal overall heat transfer coefficient of the system; and the non-metallic material is a low thermal conductivity material, and the thermal conduction resistance has a great influence on the overall heat transfer coefficient. The 0.05~1 mm thin plate design can minimize the thermal conduction resistance.

[0023] Unit size adjustment and module expansion mechanism: By adjusting the height and length of the heat exchange unit 10, the heat exchange area and unit size of a heat exchange unit are adjusted; by increasing or decreasing the number of heat exchange units 10 in a heat exchange module, the structural size and total heat exchange area of the heat exchanger are adjusted.

[0024] Quick installation and maintenance mechanism: The side plates 11 are fixed by bolts to close both ends of the module. The socket 104 on the end plate 101 and the frame rod 106 are plugged and fixed with bolts. The units are tightly sealed and connected with bolts between each other. The heat exchange membrane can be quickly disassembled by releasing the tension through the tensioning and sealing device. Each heat exchange component can be quickly assembled and disassembled.

[0025] Working principle: The cold medium enters the cold medium fluid channel 12 through the strip-shaped openings 102, and the hot medium flows in from the bottom into the hot medium fluid channel 13. The cold and hot gas media cross-flow inside the heat exchange module to achieve wall-to-wall convective heat transfer. In a heat exchange environment with phase change, the phase change condensate can form a continuous water film on the surface of the heat exchange membrane 105 to achieve a continuous self-cleaning function. The heat exchange membrane 105 generates small-amplitude vibrations under the gas disturbance, peeling off the surface attachments and preventing ash accumulation and blockage. The roller tensioning adjustment device 111 dynamically adjusts the distance between the rolling tensioning roller support rods 110 through the adjustment rod 108 to maintain uniform film tension and adapt to thermal expansion deformation. The modular design allows for flexible expansion according to the gas volume demand, and at the same time, the end plate sealing structure avoids zero flow of the cold and hot media.

[0026] Embodiment 2: As Figures 4-6 shown, this embodiment focuses on the coordinated control of the dynamic roller tensioning adjustment device and the self-cleaning function, and specifically includes the following structures: Diaphragm sealing device 115: It includes a rotating seal handle 112, a heat exchange membrane end a113, and a heat exchange membrane end b114; the heat exchange membrane end a113 is fixed on the end plate 101, and the heat exchange membrane end b114 is linked with the rolling tensioning roller 109 through a clamping structure. The rotating seal handle 112 drives the rolling tensioning roller 109 to feed axially, so that the heat exchange membrane 105 is wound and laminated with an equal pitch, and the ends are pressed against each other to form a continuous sealing interface.

[0027] Self-cleaning mechanism: The semi-flexible structure of the heat exchange membrane 105 generates irregular vibrations when the hot medium flows at a high speed. The amplitude is transmitted to the frame rod 106 through the rolling tensioning roller support rod 110 to form global micro-vibrations. The vibration energy destroys the adhesion force between the ash scale and the film, causing the accumulated ash to slide along the film surface.

[0028] Working principle: When the heat exchange membrane 105 is relaxed due to high temperature during the operation of the device, the operator rotates the rotating seal handle 112 to drive the rolling tensioning roller 109 to move axially. Uniform tension is generated between the winding layers of the heat exchange membrane 105 to restore the flat state. At the same time, the gas turbulence in the hot medium fluid channel 13 excites the film vibration. Combining with the low surface energy characteristics of the PTFE material, the ash scale cannot stably adhere. The telescopic function of the adjustment rod 108 adapts to the distance change between the frame rod 106 and the rolling tensioning roller support rod 110 in real time to ensure the dynamic sealing effect. This design is particularly suitable for multi-pollutant corrosive gas environments containing low-concentration particulate matter, sulfur, and acidic gases, and can significantly reduce the maintenance frequency.

[0029] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A polymer film heat exchange device, characterized in that: Comprising at least one heat exchange module, which is formed by combining a plurality of heat exchange units (10); the heat exchange unit (10) includes: End plates (101), arranged on the front and rear sides of the heat exchange unit, with strip-shaped openings (102) provided on the end plates as cold medium channel interfaces, rubber seal members (103) provided inside the holes, and sockets (104) provided on the upper parts of the end plates; Heat exchange diaphragms (105), fixed between the front and rear end plates (101) to form a number of cold medium fluid channels (12); A rigid semi-closed housing, which encloses with the outside of the heat exchange diaphragm (105) to form a hot medium fluid channel (13), and the cold and hot medium channels are arranged in a staggered manner and the flow directions can be interchanged; Frame rods (106), inserted into the sockets (104) of the end plates (101), connected to the front and rear two end plates (101) to form a heat exchange unit structural framework, and connected by diagonal braces (107) provided on the sides to prevent structural deformation; A roller tensioning and adjusting device (111), including an adjusting rod (108), a rolling tensioning roller (109) and a rolling tensioning roller support rod. Two groups of the rolling tensioning rollers (109) are vertically arranged between the front and rear end plates, and the rolling tensioning rollers are located outside the rolling tensioning roller support rod; the adjusting rod (108) is respectively connected to the frame rod (106) and the end of the rolling tensioning roller support rod (110), and by rotating the adjusting rod (108), the rolling tensioning roller (109) is driven to apply uniform tension to the heat exchange diaphragm (105) to realize the tension adjustment of the heat exchange diaphragm (105); A diaphragm sealing device (115), arranged at both ends of the heat exchange diaphragm (105) for realizing end sealing; Side plates (11), arranged on the left and right sides of the heat exchange module for closing the hot medium fluid channel (13) to form an independent sealed structure.

2. The polymer film heat exchange device according to claim 1, wherein: The diaphragm sealing device (115) includes a rotary sealing handle (112), a heat exchange diaphragm end a (113) and a heat exchange diaphragm end b (114); the heat exchange diaphragm end a (113) is fixed on the end plate (101); the heat exchange diaphragm end b (114) is fixed on the rolling tensioning roller (109); by rolling the heat exchange diaphragm (105) through the rotary sealing handle (112), the heat exchange diaphragm end a (113) and the heat exchange diaphragm end b (114) form a continuous sealed interface.

3. The polymer film heat exchange device according to claim 1, characterized in that: The adjusting rod (108) of the roller tensioning and adjusting device (111) is a telescopic rod body structure with double threads, and its two ends are respectively dynamically connected to the frame rod (106) and the rolling tensioning roller support rod (110), and by rotating to drive the rolling tensioning roller (109) to generate an axial displacement to adjust the gap between the end plate (101) and the rolling tensioning roller (109).

4. A polymer film heat exchange device according to claim 1, characterized in that: The rolling tensioning roller (109) is sleeved on the rolling tensioning roller support rod (110), rotates around the rolling tensioning roller support rod and is locked, and the heat exchange diaphragm (105) is wound on the surfaces of the two rolling tensioning rollers (109) at the upper and lower positions to form an interlayer seal of the cold medium channel.

5. The polymer film heat exchange device according to claim 1, characterized in that: The heat exchange diaphragm (105) is made of PTFE material, and its semi-flexible structure generates irregular deformation and vibration through gas disturbance to peel off the surface attachments, performing self-cleaning operation.

6. The polymer film heat exchange device according to claim 1, characterized in that: The flow direction of the hot medium fluid channel (13) is set from bottom to top, and the flow direction of the cold medium fluid channel (12) is set from front to back, forming a staggered countercurrent heat exchange structure.

7. A polymer film heat exchange device according to claim 1, characterized in that: The heat exchange module is enclosed on the left and right sides by side plates (11), and enclosed on the front and back sides by front and rear end plates (101), constituting an independent sealed unit.

8. A polymer film heat exchange device according to claim 1, characterized in that: The periphery of the end plate is provided with a flanging structure and is connected to adjacent heat exchange units through fasteners provided on the flanging, supporting the series and parallel expansion of multiple modules.

9. The polymer film heat exchange device according to claim 1, characterized in that: The heat exchange diaphragm (105) forms a continuous sealed interface through winding and interlayer lamination, and the diaphragm tension is controlled by the pitch of the idler tension adjusting device (111), etc.

10. A polymer film heat exchange device according to claim 1, characterized in that: The cold medium fluid channel (12) and the hot medium fluid channel (13) are staggeredly distributed, constituting a semi-flexible plate heat exchange structure, and the cold and hot medium channels can be interchanged.

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