Multidirectional coupling heat exchanger element

Abstract

The invention discloses a multidirectional coupling heat exchanger element which comprises a heat exchanger tube, an outer finned tube used for external enhanced heat exchange is clamped and positioned on the outer wall of the heat exchanger tube, an inner finned tube used for internal enhanced heat exchange is clamped and positioned in the heat exchanger tube, and H-shaped fins used for external heat transfer are integrally positioned on the outer wall of the outer finned tube. Curved fins used for internal heat transfer are symmetrically and integrally positioned on the inner wall of the inner finned tube, inner coupling structures used for quick release positioning are arranged on the upper portion and the lower portion of the inner finned tube, and outer coupling structures used for quick release positioning are arranged on the upper portion and the lower portion of the outer finned tube. The heat exchanger tube is of a structure that symmetrical curved fins in the tube are coupled and H-shaped fins outside the tube are combined. According to the multidirectional coupling heat exchanger element, the problem that the convective heat transfer coefficient is limited by low turbulent flow on the gas side of a heat exchanger is solved in the mode that the symmetrical curved fins inside the tube are coupled with the H-shaped fins outside the tube, and the condensation heat transfer coefficient is effectively and rapidly increased through the low temperature of the condensation side wall face.

Description

Technical Field

[0001] The invention relates to the technical field of heat transfer engineering application, and in particular to a multi-directional coupling heat exchanger element. Background Art

[0002] Heat exchangers are devices that transfer part of the heat of hot fluid to cold fluid, also known as heat exchangers. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial production. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, etc., and are widely used. Due to the wide use of heat exchangers in industrial production, the technology of enhancing heat transfer and improving the efficiency of heat exchangers has become the focus of increasing attention. At present, different heat exchanger structures have different advantages, so there is still room for improvement in heat exchange efficiency and structural design optimization.

[0003] In-tube and out-tube enhanced heat exchange units have been widely used in foreign heat exchange equipment as enhanced heat exchange elements. In terms of in-tube and out-tube enhanced heat exchange, they can not only increase the heat exchange area to a certain extent, but also fully improve the flow form and resistance distribution of the fluid inside and outside the tube, and significantly improve the heat transfer coefficient.

[0004] There are three main types of enhanced heat exchange structures: 1) U-type heat pipe heat exchange elements have the characteristics of uniform flow, extended heat exchange, and rapid cooling. They can effectively complete waste heat recovery while reducing the exhaust temperature, reduce temperature and save energy, increase dust removal efficiency, and achieve long-term safe and efficient operation; 2) Corrugated plate heat exchange elements have compact structure, low material consumption, low cost, and strong corrosion resistance. While achieving relatively uniform liquid film distribution and higher heat and mass transfer efficiency, they have better strength structure and dimensional control accuracy; 3) Axisymmetric plate-fin enhanced heat exchange elements have the function of enhanced convective heat transfer, significantly weakening the barrier of non-condensable gas layer to water vapor condensation heat transfer, effectively expanding the condensation heat exchange area, and increasing the condensation heat transfer coefficient.

[0005] Problems or shortcomings of the existing technology: U-shaped heat pipes have many dead corners inside the heat exchanger, low space utilization, and low heat transfer coefficient inside the heat exchanger tube; the corrugated plate heat exchanger has a limited heat transfer area, low total heat transfer efficiency, and limited external tube enhancement performance; the axisymmetric plate-fin enhanced heat exchanger tube flow field is not effectively destroyed, further enhancing heat transfer and limiting the heat transfer effect of the external fluid. For this reason, we propose a multi-directional coupled heat exchanger element. Summary of the invention

[0006] Technical problem solved: In view of the shortcomings of the prior art, the present invention provides a multi-directional coupled heat exchanger element, which solves the low turbulence-limited convection heat transfer coefficient on the gas side of the heat exchanger by coupling symmetrical curved fins inside the tube with H-shaped fins outside the tube. The low temperature of the condensation side wall effectively and quickly improves the condensation heat transfer coefficient, which can effectively solve the problems in the background technology.

[0007] Technical solution: To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multi-directional coupling heat exchanger element, including a heat exchanger tube, the outer wall of the heat exchanger tube is snap-fitted and positioned with an outer fin tube for external enhanced heat exchange, the inside of the heat exchanger tube is snap-fitted and positioned with an inner fin tube for internal enhanced heat exchange, the outer wall of the outer fin tube is integrally positioned with an H-shaped fin for external heat transfer, the inner wall of the inner fin tube is symmetrically integrally positioned with a curved fin for internal heat transfer, the upper and lower positions of the inner fin tube are both provided with an inner coupling structure for quick release positioning, the upper and lower positions of the outer fin tube are both provided with an outer coupling structure for quick release positioning, the heat exchanger tube adopts a structure combining a symmetrical curved fin coupling inside the tube with an H-shaped fin outside the tube, and the surface of the inner fin tube is integrally positioned with a composite heat exchange enhancement structure for improving the heat exchange effect.

[0008] As a preferred technical solution of the present application, the internal coupling structure and the external coupling structure both include a second plug-in slot, a first plug-in buckle, a second plug-in buckle and a first plug-in slot. When applied to an inner fin tube, a second plug-in slot and a first plug-in buckle are arranged on one side of the middle part of the inner fin tube, and a second plug-in buckle and a first plug-in slot are arranged on the other side of the middle part of the inner fin tube. The first plug-in buckle matches the first plug-in slot, and the second plug-in buckle matches the second plug-in slot. The first plug-in buckle is inserted into the interior of the first plug-in slot for quick positioning, and the second plug-in buckle is inserted into the interior of the second plug-in slot for quick positioning.

[0009] As a preferred technical solution of the present application, the inner coupling structure and the outer coupling structure are both quickly positioned by the second plug-in slot, the first plug-in buckle, the second plug-in buckle and the first plug-in slot. The inner fin tube is quickly positioned by the inner coupling structure, and the outer coupling structure drives the outer fin tube to be quickly positioned.

[0010] As a preferred technical solution of the present application, the composite heat exchange enhancement structure includes a corrosion-resistant coating, a graphene coating, a non-alloyed titanium plate, a ceramic heat exchange plate and a stainless steel plate. The ceramic heat exchange plate is located on the surface of the stainless steel plate, the non-alloyed titanium plate is located on the surface of the ceramic heat exchange plate, the graphene coating is located on the surface of the non-alloyed titanium plate, and the corrosion-resistant coating is located on the surface of the graphene coating.

[0011] As a preferred technical solution of the present application, the corrosion-resistant coating, graphene coating, non-alloyed titanium plate, ceramic heat exchange plate and stainless steel plate are integrally formed by casting.

[0012] As a preferred technical solution of the present application, in terms of liquid convective heat transfer, the curved fins and H-shaped fins greatly enhance the convective disturbance effect of the heat exchanger tube and destroy the temperature field distribution on the wall of the heat exchanger tube. When the liquid flows through the metal wall of the heat exchanger tube, the temperature gradient change is reduced, the flow boundary layer is destroyed and the convective heat transfer is enhanced.

[0013] As a preferred technical solution of the present application, in the heat exchange process on the condensation side, the inner and outer fin structures on the heat exchanger tubes enhance the flow around the flue gas and the metal wall, strengthen the condensation of water vapor in the mainstream flue gas on the fins, and improve the condensation heat transfer coefficient. The curved fins and H-shaped fins greatly increase the heat exchange area, enhance the heat exchange between the working fluid and the fins while enhancing the turbulence of the working fluid, and enhance the phase change condensation heat exchange.

[0014] As a preferred technical solution of the present application, the heat exchanger tubes are respectively coupled with inner fin tubes and outer fin tubes inside and outside, and the internal curved fins are coupled with the external H-shaped fin structure to enhance heat transfer.

[0015] Beneficial effects: Compared with the prior art, the present invention provides a multi-directional coupled heat exchanger element, which has the following beneficial effects: the multi-directional coupled heat exchanger element solves the problem of low turbulence-limited convection heat transfer coefficient on the gas side of the heat exchanger by coupling the symmetrical curved fins inside the tube with the H-shaped fins outside the tube, and effectively and quickly improves the condensation heat transfer coefficient by the low temperature of the condensation side wall surface. The symmetrical curved fins inside the tube are coupled with the H-shaped fins outside the tube to enhance heat transfer. The heat transfer element of this structure has a high finning rate. In terms of liquid convection heat transfer, the inner and outer fins can greatly enhance the convection disturbance of the element and destroy the temperature of the element wall surface. When the liquid flows through the metal wall, the temperature gradient change is effectively reduced, the flow boundary layer is destroyed, and the convective heat transfer effect is enhanced; in the heat transfer process on the condensation side, the strengthening element structure can enhance the flow effect between the flue gas and the metal wall, enhance the condensation of water vapor in the flue gas mainstream on the fins, and effectively improve the condensation heat transfer coefficient. The fins inside and outside the tube can greatly increase the heat transfer area, enhance the heat transfer between the working fluid and the fins while enhancing the turbulence of the working fluid, and enhance the phase change condensation heat transfer effect. The entire heat exchange element has a simple structure and is easy to operate, and the effect of use is better than that of the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the overall structure of a multi-directional coupling heat exchanger element of the present invention.

[0017] Figure 2 It is a schematic diagram of the overall internal structure of a multi-directional coupling heat exchanger element of the present invention.

[0018] Figure 3 The present invention is a schematic structural diagram of an inner fin tube in a multi-directional coupling heat exchanger element.

[0019] Figure 4 The present invention is a schematic diagram of the structure of the exploded inner fin tube in a multi-directional coupling heat exchanger element.

[0020] Figure 5 It is a structural schematic diagram of an enlarged view of point A in a multi-directional coupling heat exchanger element of the present invention.

[0021] Figure 6 It is a structural schematic diagram of a composite heat exchange enhancement structure in a multi-directional coupling heat exchanger element of the present invention.

[0022] In the figure: 1. heat exchanger tube; 2. H-shaped fin; 3. inner fin tube; 4. outer fin tube; 5. inner coupling structure; 6. outer coupling structure; 7. curved fin; 8. second plug-in slot; 9. first plug-in buckle; 10. second plug-in buckle; 11. first plug-in slot; 12. composite heat exchange enhancement structure; 13. corrosion-resistant coating; 14. graphene coating; 15. non-alloyed titanium plate; 16. ceramic heat exchange plate; 17. stainless steel plate. DETAILED DESCRIPTION

[0023] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1-6 As shown, a multi-directional coupling heat exchanger element comprises a heat exchanger tube 1, an outer fin tube 4 for external enhanced heat exchange is clamped and positioned on the outer wall of the heat exchanger tube 1, an inner fin tube 3 for internal enhanced heat exchange is clamped and positioned inside the heat exchanger tube 1, an H-shaped fin 2 for external heat transfer is integrally positioned on the outer wall of the outer fin tube 4, a curved fin 7 for internal heat transfer is symmetrically integrally positioned on the inner wall of the inner fin tube 3, an inner coupling structure 5 for quick-release positioning is provided at the upper and lower positions of the inner fin tube 3, an outer coupling structure 6 for quick-release positioning is provided at the upper and lower positions of the outer fin tube 4, the heat exchanger tube 1 adopts a structure combining a symmetrical curved fin coupling inside the tube with an H-shaped fin outside the tube, and a composite exchange structure for improving the heat exchange effect is integrally positioned on the surface of the inner fin tube 3 The heat enhancement structure 12 adopts the method of coupling symmetrical curved fins inside the tube with H-shaped fins outside the tube to enhance heat transfer. The heat transfer element of this structure has a very high finning rate. In terms of liquid convection heat transfer, the inner and outer fins can greatly enhance the convection disturbance of the element and destroy the temperature field distribution on the element wall. When the liquid flows over the metal wall, the temperature gradient change is effectively reduced, the flow boundary layer is destroyed, and the convection heat transfer effect is enhanced. In the heat transfer process on the condensation side, the enhanced element structure can enhance the flow around the flue gas and the metal wall, enhance the condensation of water vapor in the mainstream flue gas on the fins, and effectively improve the condensation heat transfer coefficient. The finning inside and outside the tube can greatly increase the heat exchange area, enhance the heat exchange between the working fluid and the fins while enhancing the turbulence of the working fluid, and enhance the phase change condensation heat transfer effect.

[0027] Furthermore, the inner coupling structure 5 and the outer coupling structure 6 both include a second plug-in slot 8, a first plug-in buckle 9, a second plug-in buckle 10 and a first plug-in slot 11. When applied to the inner fin tube 3, the second plug-in slot 8 and the first plug-in buckle 9 are arranged on one side of the middle part of the inner fin tube 3, and the second plug-in buckle 10 and the first plug-in slot 11 are arranged on the other side of the middle part of the inner fin tube 3. The first plug-in buckle 9 matches the first plug-in slot 11, and the second plug-in buckle 10 matches the second plug-in slot 8. The first plug-in buckle 9 is inserted into the interior of the first plug-in slot 11 for quick positioning, and the second plug-in buckle 10 is inserted into the interior of the second plug-in slot 8 for quick positioning.

[0028] Furthermore, the inner coupling structure 5 and the outer coupling structure 6 are both quickly released and positioned through the second plug-in slot 8, the first plug-in buckle 9, the second plug-in buckle 10 and the first plug-in slot 11, the inner fin tube 3 is quickly released and positioned through the inner coupling structure 5, and the outer coupling structure 6 drives the outer fin tube 4 to be quickly released and positioned.

[0029] Furthermore, the composite heat exchange enhancement structure 12 includes a corrosion-resistant coating 13, a graphene coating 14, a non-alloyed titanium plate 15, a ceramic heat exchange plate 16 and a stainless steel plate 17. The ceramic heat exchange plate 16 is located on the surface of the stainless steel plate 17, the non-alloyed titanium plate 15 is located on the surface of the ceramic heat exchange plate 16, the graphene coating 14 is located on the surface of the non-alloyed titanium plate 15, and the corrosion-resistant coating 13 is located on the surface of the graphene coating 14.

[0030] Furthermore, the corrosion-resistant coating 13, the graphene coating 14, the non-alloyed titanium plate 15, the ceramic heat exchange plate 16 and the stainless steel plate 17 are integrally formed by casting.

[0031] Furthermore, in terms of liquid convection heat transfer, the curved fins 7 and the H-shaped fins 2 greatly enhance the convection disturbance effect of the heat exchanger tube 1 and destroy the temperature field distribution on the wall of the heat exchanger tube 1. When the liquid flows through the metal wall of the heat exchanger tube 1, the temperature gradient change is reduced, the flow boundary layer is destroyed and the convection heat transfer is enhanced.

[0032] Furthermore, in the heat exchange process on the condensation side, the internal and external fin structures on the heat exchanger tube 1 enhance the flow around the flue gas and the metal wall, strengthen the condensation of water vapor in the mainstream flue gas on the fins, and improve the condensation heat transfer coefficient. The curved fins 7 and the H-shaped fins 2 greatly increase the heat exchange area, while enhancing the turbulence of the working fluid, enhancing the heat exchange between the working fluid and the fins, and strengthening the phase change condensation heat exchange.

[0033] Furthermore, the inner and outer fin tubes 3 and the outer fin tubes 4 are coupled to the heat exchanger tube 1 respectively, and the inner curved fins 7 are coupled to the outer H-shaped fin 2 structure to enhance heat transfer.

[0034] Working principle: The present invention comprises a heat exchanger tube 1, an H-shaped fin 2, an inner fin tube 3, an outer fin tube 4, an inner coupling structure 5, an outer coupling structure 6, a curved fin 7, a second plug-in slot 8, a first plug-in buckle 9, a second plug-in buckle 10, a first plug-in slot 11, a composite heat exchange enhancement structure 12, a corrosion-resistant coating 13, a graphene coating 14, a non-alloyed titanium plate 15, a ceramic heat exchange plate 16, and a stainless steel plate 17. The symmetrical curved fins inside the tube are coupled with the H-shaped fins outside the tube to solve the problem of the lower turbulence-limited convection heat transfer coefficient on the gas side of the heat exchanger. The low temperature on the condensation side wall surface effectively and quickly improves the condensation heat transfer coefficient. The symmetrical curved fins inside the tube are coupled with the H-shaped fins outside the tube to strengthen the heat transfer coefficient. The heat transfer of this structure is very high. In terms of liquid convection heat transfer, the internal and external fins can greatly enhance the convection disturbance of the element and destroy the temperature field distribution on the element wall. When the liquid flows through the metal wall, the temperature gradient change is effectively reduced, the flow boundary layer is destroyed, and the convection heat transfer effect is enhanced. In the heat transfer process on the condensation side, the strengthening element structure can enhance the flow around the flue gas and the metal wall, enhance the condensation of water vapor in the mainstream flue gas on the fins, and effectively improve the condensation heat transfer coefficient. The finning inside and outside the tube can greatly increase the heat exchange area, while enhancing the turbulence of the working fluid, it also enhances the heat exchange between the working fluid and the fins, and enhances the phase change condensation heat transfer effect.

[0035] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A multi-directional coupled heat exchanger element, comprising a heat exchanger tube (1), characterized in that: The outer wall of the heat exchanger tube (1) is engaged and positioned with an outer fin tube (4) for external enhanced heat exchange, the inner wall of the heat exchanger tube (1) is engaged and positioned with an inner fin tube (3) for internal enhanced heat exchange, the outer wall of the outer fin tube (4) is integrally positioned with an H-shaped fin (2) for external heat transfer, the inner wall of the inner fin tube (3) is symmetrically integrally positioned with a curved fin (7) for internal heat transfer, the upper and lower positions of the inner fin tube (3) are both provided with an inner coupling structure (5) for quick release positioning, the upper and lower positions of the outer fin tube (4) are both provided with an outer coupling structure (6) for quick release positioning, the heat exchanger tube (1) adopts a structure in which a symmetrical curved fin coupling inside the tube is combined with an H-shaped fin outside the tube, and the surface of the inner fin tube (3) is integrally positioned with a composite heat exchange enhancement structure (12) for improving the heat exchange effect.

2. A multi-directional coupling heat exchanger element according to claim 1, characterized in that: The inner coupling structure (5) and the outer coupling structure (6) both comprise a second plug-in slot (8), a first plug-in buckle (9), a second plug-in buckle (10) and a first plug-in slot (11). When applied to an inner fin tube (3), the second plug-in slot (8) and the first plug-in buckle (9) are arranged on one side of the middle of the inner fin tube (3), and the second plug-in buckle (10) and the first plug-in slot (11) are arranged on the other side of the middle of the inner fin tube (3); the first plug-in buckle (9) matches the first plug-in slot (11), and the second plug-in buckle (10) matches the second plug-in slot (8); the first plug-in buckle (9) is inserted into the interior of the first plug-in slot (11) for quick positioning, and the second plug-in buckle (10) is inserted into the interior of the second plug-in slot (8) for quick positioning.

3. A multi-directional coupling heat exchanger element according to claim 2, characterized in that: The inner coupling structure (5) and the outer coupling structure (6) are both quickly disassembled and positioned via the second plug-in slot (8), the first plug-in buckle (9), the second plug-in buckle (10) and the first plug-in slot (11); the inner fin tube (3) is quickly disassembled and positioned via the inner coupling structure (5); and the outer coupling structure (6) drives the outer fin tube (4) to be quickly disassembled and positioned.

4. The multi-directional coupling heat exchanger element according to claim 1, characterized in that: The composite heat exchange enhancement structure (12) comprises a corrosion-resistant coating (13), a graphene coating (14), a non-alloyed titanium plate (15), a ceramic heat exchange plate (16) and a stainless steel plate (17), wherein the ceramic heat exchange plate (16) is located on the surface of the stainless steel plate (17), the non-alloyed titanium plate (15) is located on the surface of the ceramic heat exchange plate (16), the graphene coating (14) is located on the surface of the non-alloyed titanium plate (15), and the corrosion-resistant coating (13) is located on the surface of the graphene coating (14).

5. A multi-directional coupling heat exchanger element according to claim 4, characterized in that: The corrosion-resistant coating (13), the graphene coating (14), the non-alloyed titanium plate (15), the ceramic heat exchange plate (16) and the stainless steel plate (17) are integrally formed by casting.

6. The multi-directional coupling heat exchanger element according to claim 1, characterized in that: In terms of liquid convection heat transfer, the curved fins (7) and the H-shaped fins (2) greatly enhance the convection disturbance effect of the heat exchanger tube (1) and destroy the temperature field distribution on the wall of the heat exchanger tube (1). When the liquid flows through the metal wall of the heat exchanger tube (1), the temperature gradient change is reduced, the flow boundary layer is destroyed and the convection heat transfer is enhanced.

7. The multi-directional coupling heat exchanger element according to claim 1, characterized in that: In the heat exchange process on the condensation side, the internal and external fin structures on the heat exchanger tube (1) enhance the flow effect between the flue gas and the metal wall, strengthen the condensation of water vapor in the flue gas mainstream on the fins, and improve the condensation heat transfer coefficient. The curved fins (7) and the H-shaped fins (2) greatly increase the heat exchange area, enhance the heat exchange between the working fluid and the fins while enhancing the turbulence of the working fluid, and enhance the phase change condensation heat transfer.

8. The multi-directional coupling heat exchanger element according to claim 1, characterized in that: The heat exchanger tube (1) is coupled to an inner fin tube (3) and an outer fin tube (4) inside and outside respectively, and an inner curved fin (7) is coupled to an outer H-shaped fin (2) structure to enhance heat transfer.

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