A polymer film heat exchange device

Abstract

The present invention discloses a polymer film heat exchange device, which includes a heat exchange module formed by combining a plurality of heat exchange units; each heat exchange unit includes end plates disposed on the front and rear sides of the heat exchange unit, and heat exchange diaphragms are fixed between the front and rear end plates to form a number of cold medium fluid channels; a rigid semi-closed housing and the outer side of the heat exchange diaphragms enclose to form a hot medium fluid channel, and the roller tensioning and adjusting device includes an adjusting rod, a rolling tensioning roller and a rolling tensioning roller support rod. By rotating the adjusting rod to drive the rolling tensioning roller to apply uniform tension to the heat exchange diaphragms, the tension adjustment of the heat exchange diaphragms is realized; a diaphragm sealing device is disposed at both ends of the heat exchange diaphragms for end sealing; side plates are disposed on the left and right sides of the heat exchange module for closing the hot medium fluid channel; in the present invention, through the film type design of the heat exchange material, the modular support structure and the dynamic tensioning and adjusting design, the bottleneck of the low thermal conductivity of the polymer material is overcome, and the overall heat transfer coefficient is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas heat exchange, and particularly to a gas-gas plate heat exchanger that can be used for medium and high temperature gas heat exchange in a highly corrosive environment. The heat exchanger uses a high-temperature 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 combined into a heat exchange module according to size requirements, and a set of polymer film heat exchangers 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, hot and cold gas heat exchange, and industrial enterprise heat recovery. 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. However, they are prone to pitting corrosion and blockage in industrial corrosive gas environments such as acidic, sulfur-containing, and dust-containing, 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 step-by-step improvement of thermal conductivity can be achieved through composite modification means, the interfacial thermal resistance problem 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. The rigid flow channels (such as shell-and-tube type, flat plate type) of metal heat exchangers are adopted, and no optimization is carried out for the low thermal conductivity characteristics of non-metals, resulting in insufficient turbulent intensity in the flow channels 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 exchanger 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 includes at least one heat exchange module, and the heat exchange module 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:

[0006] End plates are arranged on the front and rear sides of the heat exchange unit. Strip-shaped openings are provided on the end plates as cold medium channel interfaces, and rubber seal rings are provided inside the holes. Sockets are provided on the upper parts of the end plates to form the internal structure of the heat exchange module;

[0007] Heat exchange membranes, which are films with a thickness of 0.05 - 1 mm, are fixed between the front and rear end plates to form several groups of cold medium fluid channels;

[0008] A rigid semi-closed housing encloses with the outside of the heat exchange membrane to form a hot medium fluid channel. The cold and hot medium channels are arranged in a staggered manner and the flow directions can be interchanged;

[0009] Frame rods are inserted into the sockets of the end plates, and are connected to the front and rear end plates to form a frame of the heat exchange unit structure, and diagonal bracing is provided on the side to prevent structural deformation;

[0010] A roller tension adjustment device includes 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 rear end plates, and the rolling tension rollers are located outside the rolling tension roller support rod; the adjustment rods are respectively connected to the frame rod and the end of the rolling tension roller support rod, and the rolling tension roller is driven to apply uniform tension to the heat exchange membrane by rotating the adjustment rod to realize the tension adjustment of the heat exchange membrane; <{

[0011] A membrane sealing device is arranged at both ends of the heat exchange membrane for end sealing;

[0012] Side plates are arranged on the left and right sides of the heat exchange module to enclose the hot medium fluid channel to form an independent sealed structure.

[0013] Preferably, the diaphragm sealing device includes a rotary sealing handle, a heat exchange diaphragm end a and a heat exchange diaphragm end b; the heat exchange diaphragm end a is fixed on the end plate; the heat exchange diaphragm end b is fixed on a rolling tensioning roller; the heat exchange diaphragm is rolled by the rotary sealing handle so that the heat exchange diaphragm end a and the heat exchange diaphragm end b form a continuous closed interface.

[0014] Preferably, the adjusting rod of the roller tensioning adjustment device is a retractable rod structure with bidirectional threads, and its two ends are dynamically connected with the frame rod and the rolling tensioning roller support rod respectively. The rolling tensioning roller is driven by rotation to produce axial displacement, thereby adjusting the gap between the end plate and the rolling tensioning roller.

[0015] Preferably, the rolling tensioning roller is sleeved on the rolling tensioning roller support rod, and rotates and locks around the rolling tensioning roller support rod. The surfaces of the two rolling tensioning rollers at the upper and lower positions are wrapped with heat exchange diaphragms to form interlayer seals in the cold medium channel.

[0016] Preferably, the heat exchange membrane is made of PTFE, and its semi-flexible structure produces irregular deformation and vibration through gas disturbance to peel off surface attachments, thereby achieving a self-cleaning function.

[0017] Preferably, the flow direction of the hot medium fluid channel is set to be from bottom to top, and the flow direction of the cold medium fluid channel is set to be from front to back, forming a staggered countercurrent heat exchange structure.

[0018] Preferably, the heat exchange module is sealed on the left and right sides by side panels, and on the front and rear ends by front and rear end panels, forming an independent sealed unit.

[0019] Preferably, the end plates are provided with flange structures around them and are connected to adjacent heat exchange units via fasteners provided on the flanges, thereby supporting multi-module series and parallel expansion.

[0020] Preferably, the heat exchange membrane is wound and laminated to form a continuous and sealed interface, and the membrane tension is controlled by a pitch of a roller tensioning adjustment device.

[0021] Preferably, the cold medium fluid channels and the hot medium fluid channels are staggeredly distributed to form a semi-flexible plate heat exchange structure, and the cold and hot medium channels are interchangeable.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the thin film sheet design of the heat exchange material, the modular support structure and the dynamic tension adjustment design are used to overcome the bottleneck of low thermal conductivity of polymer materials and improve the comprehensive heat transfer coefficient. It is suitable for highly corrosive, medium and high temperature gas-to-gas heat exchange conditions, and is particularly suitable for industrial gas heat exchange scenarios with phase change.

[0024] 2. The semi-flexible heat exchange film material in the present invention generates irregular deformations under air flow disturbances, can automatically peel off dust and attachments on the surface area, effectively avoid channel blockage, and achieve the self-cleaning function; combining the characteristics of PTFE material with the metal support and sealing system enables the device to withstand temperatures up to 200°C and 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.

[0025] 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 achieve rapid disassembly, replacement, and significantly reduce the downtime maintenance frequency in cooperation with the self-cleaning function, significantly improving the economic efficiency of system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] In the drawings:

[0028] Figure 1 is a schematic structural diagram of the heat exchange module of the present invention;

[0029] Figure 2 is a schematic structural diagram of a single heat exchange unit of the present invention;

[0030] Figure 3 is a schematic structural diagram of the end plate of the present invention;

[0031] Figure 4 is a schematic structural diagram of the support frame of the present invention;

[0032] Figure 5 is a schematic structural diagram of the idler tension adjustment device of the present invention;

[0033] Figure 6 is a schematic structural diagram of the diaphragm sealing device of the present invention;

[0034] 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 pull; 108, adjusting rod; 109, rolling tensioning idler; 110, rolling tensioning 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

[0035] The preferred embodiments of the present invention will be described below in conjunction with the accompanying 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.

[0036] Embodiment 1: As Figures 1 - 5 shown, a polymer film heat exchange device, the heat exchange device can withstand a temperature range of 50~200°C, is suitable for strong corrosive, medium-high temperature gas-gas heat exchange conditions, and is particularly suitable for industrial gas heat exchange scenarios with phase change; it includes a heat exchange unit 10, an end plate sealing assembly and a dynamic tensioning system. Specifically, a plurality of 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:

[0037] 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, and 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.

[0038] 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 housing 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 suitable for heat exchange of corrosive gases with phase change. It gives full play to the high heat transfer coefficient of phase change heat transfer. Using the polymer membrane with a thin plate design as the heat exchange plate can minimize the conduction heat resistance to ensure the optimal overall heat transfer coefficient of the system; and the non-metallic material is a low-conductivity material, and the conduction heat resistance has a greater impact on the overall heat transfer coefficient. The 0.05~1 mm thin plate design can minimize the conduction heat resistance.

[0039] Unit size adjustment and module expansion mechanism: The heat exchange area and unit size of a heat exchange unit are adjusted by adjusting the height and length of the heat exchange unit 10; the structural size and total heat exchange area of the heat exchanger are adjusted by increasing or decreasing the number of heat exchange units 10 in a heat exchange module.

[0040] Quick installation and maintenance mechanism: The side plates 11 are fixed to both ends of the closed module by bolts. The socket 104 on the end plate 101 is inserted and fixed to the frame rod 106 with bolts. The units are tightly and sealedly connected to each other by bolts. The heat exchange diaphragm can be quickly disassembled by releasing the tension through the tensioning and sealing device. All heat exchange components can be quickly assembled and disassembled.

[0041] Working principle: The cold medium enters the cold medium fluid channel 12 through the strip-shaped opening 102, and the hot medium flows into the hot medium fluid channel 13 from the bottom. 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 diaphragm 105 to achieve a continuous self-cleaning function. The heat exchange diaphragm 105 generates small-amplitude vibrations under the gas disturbance, peeling off the surface attachments to prevent ash accumulation and blockage. The roller tensioning and adjusting device 111 dynamically adjusts the distance between the rolling tensioning roller support rods 110 through the adjusting 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 prevents zero flow of cold and hot media.

[0042] Example 2: As Figures 4 - 6 shown, this example focuses on the coordinated control of the dynamic roller tensioning and adjusting device and the self-cleaning function, specifically including the following structures:

[0043] Diaphragm sealing device 115: It 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 to the end plate 101, and the heat exchange diaphragm end b 114 is linked to the rolling tensioning roller 109 through a clamping structure. The rotary sealing handle 112 drives the rolling tensioning roller 109 to feed spirally, so that the heat exchange diaphragm 105 is wound in an equal pitch and overlapped, and the ends are pressed against each other to form a continuous sealing interface.

[0044] Self-cleaning mechanism: The semi-flexible structure of the heat exchange diaphragm 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 a global micro-vibration. The vibration energy destroys the adhesion between the ash scale and the film, causing the accumulated ash to slide along the film surface.

[0045] Working principle: When the heat exchange diaphragm 105 becomes loose due to high temperature during the operation of the device, the operator rotates the sealing handle 112 to drive the rolling tensioning roller 109 to move axially, generating uniform tension between the winding layers of the heat exchange diaphragm 105 to restore it to a flat state. At the same time, the gas turbulence in the hot medium fluid channel 13 excites the vibration of the thin film. Combining with the low surface energy characteristics of the PTFE material, the ash scale cannot stably adhere. The telescopic function of the adjusting rod 108 adapts to the change in the distance 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.

[0046] 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: It includes 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) are arranged on the front and rear sides of the heat exchange unit. The end plates are provided with strip-shaped openings (102) as cold medium channel interfaces. Rubber ring seals (103) are arranged inside the holes, and sockets (104) are provided on the upper parts of the end plates; Heat exchange diaphragms (105) are fixed between the front and rear end plates (101) to form a number of cold medium fluid channels (12); A rigid semi-closed housing encloses with the outer side of the heat exchange diaphragm (105) to form a hot medium fluid channel (13). The cold and hot medium channels are arranged in a staggered manner and the flow directions can be interchanged; Frame rods (106) are inserted into the sockets (104) of the end plates (101), and are connected to the front and rear two end plates (101) to form a structural frame of the heat exchange unit, and are connected by diagonal braces (107) provided on the sides to prevent structural deformation; A roller tensioning and adjusting device (111) includes 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 located between the front and rear end plates. 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). By rotating the adjusting rod (108), the rolling tensioning roller (109) is driven to apply uniform tension to the heat exchange diaphragm (105), so as to realize the tension adjustment of the heat exchange diaphragm (105); A diaphragm sealing device (115) is arranged at both ends of the heat exchange diaphragm (105) for end sealing; Side plates (11) are arranged on the left and right sides of the heat exchange module to enclose the hot medium fluid channel (13) to form an independent sealed structure; 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 the rotary sealing handle (112), the heat exchange diaphragm (105) is wound to make the heat exchange diaphragm end a (113) and the heat exchange diaphragm end b (114) form a continuous sealed interface; 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). By rotating, the rolling tensioning roller (109) is driven to generate an axial displacement to adjust the gap between the end plate (101) and the rolling tensioning roller (109); The rolling tensioning roller (109) is sleeved on the rolling tensioning roller support rod (110), and rotates and locks around the rolling tensioning roller support rod. 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; 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.

2. 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.

3. The 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.

4. 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-parallel expansion of multiple modules.

5. A 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 tension of the diaphragm is controlled by the pitch of the idler tensioning device (111), etc.

6. The 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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