Hollow spiral double-hydrophilic-surface shell and tube heat exchanger

Abstract

The hollow spiral double-hydrophilic-surface shell and tube heat exchanger comprises a shell, a liquid distributor assembly and a spiral heat exchange tube, the liquid distributor assembly is arranged at the top of the shell, and fluid flows through the inner surface and the outer surface of the shell after entering the liquid distributor assembly; the shell is hollow and is fixedly connected with a spiral heat exchange tube; the inner surface and the outer surface of the shell are covered with hydrophilic surfaces. The hydrophilic surface is introduced to the surface of the heat exchanger, so that the heat transfer efficiency can be improved, the energy consumption is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This application relates to the field of heat exchangers, and particularly to a shell-and-tube heat exchanger with a hollow spiral amphiphilic surface. Background Art

[0002] The shell-and-tube heat exchanger is a common heat exchange device used to transfer heat between different fluids. The structure of the shell-and-tube heat exchanger includes a shell (housing) and a set of tube bundles. The shell is usually a cylindrical container with one or more tube bundles inside. The tube bundle consists of a series of parallel tubes, and the two ends of the tubes are connected to the shell through tube sheets. Fluids flow through the tubes in the tube bundle and the pipes in the shell to achieve heat transfer. Compared with other types of heat exchangers, the shell-and-tube heat exchanger has the characteristics of mature technology, reliable structure, and easy maintenance, and is most widely used in industrial production. Due to the diversity of operating conditions (corrosion, temperature, pressure, medium, impurities, heat transfer amount, etc.) of the heat exchanger, it is necessary to carry out reasonable structural design and optimization, such as increasing the heat transfer area, optimizing the fluid flow path, improving material selection, and enhancing the cleaning performance of the heat exchanger. These improvements can improve the thermal efficiency of the shell-and-tube heat exchanger, reduce energy consumption, extend the service life, and meet different process requirements.

[0003] Traditional heat transfer materials are mostly made of copper or stainless steel, with limited heat transfer efficiency; during the heat transfer process, heat is transferred from the liquid with a higher temperature to the liquid with a lower temperature, causing its temperature to rise rapidly. Therefore, traditional heat exchangers have a series of problems such as low heat transfer efficiency, high energy consumption, and even easy damage to the equipment. Summary of the Invention

[0004] Objective: To overcome the deficiencies in the prior art, the present invention provides a shell-and-tube heat exchanger with a hollow spiral amphiphilic surface to improve heat transfer efficiency and reduce energy consumption.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] This application provides a shell-and-tube heat exchanger with a hollow spiral amphiphilic surface, which includes a shell, a liquid distributor assembly, and a spiral heat exchange tube. The liquid distributor assembly is arranged at the top of the shell, and the fluid flows through the inner surface and the outer surface of the shell after passing through the liquid distributor assembly; The interior of the shell is hollow and fixedly connected with a spiral heat exchange tube; Both the inner and outer surfaces of the shell are covered with amphiphilic surfaces.

[0007] In some embodiments, the liquid distributor assembly includes a main groove, liquid distribution pipes, and an end distribution orifice plate. The end distribution orifice plate includes a first distribution groove and a second distribution groove, and the first distribution groove is located above the second distribution groove; The notch of the first distribution groove is tangent to the upper edge of the housing. After the fluid in the liquid distribution pipe enters the main groove, it flows through the outer surface of the housing through the first distribution groove; The notch of the second distribution groove is tangent to the inner surface of the upper end of the housing. After the fluid in the liquid distribution pipe enters the main groove, it flows through the inner surface of the housing through the second distribution groove.

[0008] In some embodiments, the spiral heat exchange tube includes a spiral tube inlet pipe and a spiral tube outlet pipe. The spiral tube inlet pipe is connected to the spiral heat exchange tube inlet of the upper part of the housing and is used to introduce the first heat exchange medium into the spiral heat exchange tube; the spiral tube outlet pipe is connected to the spiral heat exchange tube outlet of the lower part of the housing; A heat exchanger shell layer inlet pipe is arranged at the lower part of the housing and is used to introduce the second heat exchange medium into the housing. A heat exchanger shell layer outlet pipe is arranged at the upper part of the housing; The fluid in the liquid distributor assembly is the same as the second heat exchange medium.

[0009] It should be noted that the hollow spiral amphiphilic surface shell and tube heat exchanger provided in the present application has two heat exchange methods: First, when the second heat exchange medium is a fluid with low viscosity and large flow rate, the second heat exchange medium is introduced into the housing through the heat exchanger shell layer inlet pipe at the lower part of the housing, and the second heat exchange medium flows out of the housing through the heat exchanger shell layer outlet pipe at the upper part of the housing. At this time, the fluid in the liquid distributor only flows through the outer surface of the hollow spiral amphiphilic surface shell and tube heat exchanger; Second, when the second heat exchange medium is a fluid with high viscosity and small flow rate, in order to make the second heat exchange medium evenly distributed and prevent it from being blocked in the housing, only based on the liquid distributor assembly, the second heat exchange medium flows through the inner and outer surfaces of the hollow spiral amphiphilic surface shell and tube heat exchanger, and the second heat exchange medium finally flows out of the housing through the heat exchanger shell layer inlet pipe at the lower part of the housing.

[0010] In some embodiments, a humidity detector is installed on the outer surface of the housing and is used to periodically monitor the relative humidity of the air. When the monitored relative humidity of the air exceeds the set range, an alarm signal is output. The operator controls the opening and closing of the liquid distribution pipe in the liquid distributor assembly and the size of the pipe flow according to the monitoring result.

[0011] In some embodiments, the outer surface of the housing is corrugated or spiral, which is used to increase the contact area between the fluid and the outer surface of the housing.

[0012] In some embodiments, the hydrophilic surfaces on the inner and outer surfaces of the heat exchanger housing are fluorine-containing surface treatment agents.

[0013] In some embodiments, the contact angle between the hydrophilic surface and the fluid is 0°-30°.

[0014] In some embodiments, the thickness of the hydrophilic surface is 10 - 100 nm.

[0015] In some embodiments, the hydrophilic surface is engraved with micron-scale patterns or regular repeating legends. The patterns include stripes and columns, and the legends include squares and hexagons.

[0016] In a second aspect, the present application provides a manufacturing method for the shell-and-tube heat exchanger with a hollow spiral double hydrophilic surface as described in the first aspect, including: sandblasting or chemically cleaning the inner and outer surfaces of the shell and then coating a primer containing polytetrafluoroethylene; curing the primer by high-temperature sintering.

[0017] Beneficial effects:

[0018] 1. A liquid distributor assembly is provided at the top of the shell-and-tube heat exchanger. Using the liquid distributor assembly can evenly distribute the liquid on the tube wall, making the heat transfer more sufficient; using the liquid distributor assembly can also make the hydrophilic surface have a reasonable surface liquid film thickness, enabling it to better play the role of reducing the thermal resistance.

[0019] 2. The inner and outer surfaces of the shell of the shell-and-tube heat exchanger are both hydrophilic surfaces. The hydrophilic surface on the inner side of the shell can make the medium form a smaller contact angle on the surface, reducing adhesion and accumulation; the hydrophilic surface on the outer side of the shell can reduce the thermal resistance between the heat exchanger tube wall and the air, improving the heat transfer efficiency.

[0020] By introducing a hydrophilic surface on the heat exchanger surface, the present application can improve the heat transfer efficiency, reduce energy consumption, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic plan view of the shell-and-tube heat exchanger with a hollow spiral double hydrophilic surface in an embodiment of the present invention;

[0023] Figure 2 It is a schematic three-dimensional view of the shell-and-tube heat exchanger with a hollow spiral double hydrophilic surface in an embodiment of the present invention;

[0024] Figure 3 It is a schematic sectional view of the shell-and-tube heat exchanger with a hollow spiral double hydrophilic surface in an embodiment of the present invention;

[0025] Figure 4Schematic plan view of the liquid distributor assembly in the embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the humidity detector in the embodiment of the present invention.

[0027] In the figure: 1 main groove; 2 liquid distribution pipe; 3 end distribution orifice plate, 31 first distribution groove, 32 second distribution groove; 4 out-flow pipe of heat exchanger shell; 5 inflow pipe of spiral pipe, 51 inflow port of spiral heat exchange pipe; 6 spiral heat exchange pipe; 7 out-flow pipe of spiral pipe, 71 out-flow port of spiral heat exchange pipe; 8 inflow pipe of heat exchanger shell; 9 humidity detector; 10 hydrophilic surface; 11 humidity detection instrument panel; 12 housing. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use.

[0029] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the convenience of description, the dimensions of each part shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may also include different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] Embodiment 1:

[0031] As Figures 1 to 3 shown, this embodiment provides a hollow spiral double hydrophilic surface shell and tube heat exchanger, including a housing 12, a liquid distributor assembly and a spiral heat exchange tube 6; The liquid distributor assembly is welded to the top of the housing 12, and the fluid flows through the inner and outer surfaces of the housing 12 after passing through the liquid distributor assembly; The housing 12 is hollow and welded with a spiral heat exchange tube 6; Both the inner and outer surfaces of the housing 12 are covered with a hydrophilic surface 10.

[0032] Further, in combination with Figure 2and Figure 4 The liquid distributor assembly includes a main tank 1, a liquid distribution pipe 2, and a terminal distribution orifice plate 3. The terminal distribution orifice plate 3 includes a first distribution groove 31 and a second distribution groove 32, and the first distribution groove 31 is located above the second distribution groove 32.

[0033] The notch of the first distribution groove 31 is tangent to the upper edge of the outer surface of the housing 12. After the fluid in the liquid distribution pipe 2 enters the main tank 1, it flows through the outer surface of the housing 12 through the first distribution groove 31; The notch of the second distribution groove 32 is tangent to the inner surface of the upper end of the housing 12. After the fluid in the liquid distribution pipe 2 enters the main tank 1, it flows through the inner surface of the housing 12 through the second distribution groove 32.

[0034] In some embodiments, the spiral heat exchange tube 6 includes a spiral tube inlet pipe 5 and a spiral tube outlet pipe 7. The spiral tube inlet pipe 5 is connected to the spiral heat exchange tube inlet port 51 at the upper part of the housing, and is used to introduce the first heat exchange medium into the spiral heat exchange tube 6 of the heat exchanger; the spiral tube outlet pipe 7 is connected to the spiral heat exchange tube outlet port 71 at the lower part of the housing; A heat exchanger shell layer inlet pipe 8 is provided at the lower part of the housing 12, and is used to introduce the second heat exchange medium into the housing. A heat exchanger shell layer outlet pipe 4 is provided at the upper part of the housing 12; The fluid in the liquid distributor assembly is the same as the second heat exchange medium.

[0035] In this embodiment, a fluid with high viscosity and small flow rate is used as the second heat exchange medium. To evenly distribute the second heat exchange medium and prevent it from clogging inside the housing 12, the second heat exchange medium flows through the inner and outer surfaces of the hollow spiral amphiphilic surface shell and tube heat exchanger based on the liquid distributor assembly, and finally the second heat exchange medium flows out of the housing 12 from the heat exchanger shell layer inlet pipe 8 at the lower part of the housing 12.

[0036] Furthermore, in some embodiments, as Figure 5 shown, a humidity detector 9 is installed on the outer surface of the housing, and is used to monitor the relative humidity of the air. The dial 11 of the humidity detector 9 can display the real-time relative humidity of the air.

[0037] In this embodiment, the relative humidity of the air is monitored with a period of 60 seconds. When the humidity is too high or too low, the humidity detector 9 gives an alarm, and the operator controls the opening and closing of the liquid distribution pipe 2 and the flow rate of the pipe flow in the liquid distributor assembly according to this monitoring result.

[0038] In some embodiments, the outer surface of the housing 12 is corrugated or spiral, and is used to increase the contact area between the fluid and the outer surface of the housing 12, and improve the heat exchange efficiency.

[0039] In some embodiments, the hydrophilic surface 10 on the inner and outer surfaces of the heat exchanger housing 12 is a fluorine-containing surface treatment agent. Adding this material to the coating can significantly enhance the hydrophilicity of the surface, while having strong anti-fouling and anti-corrosion properties.

[0040] In some embodiments, the contact angle between the hydrophilic surface 10 and the fluid is 0° - 30°.

[0041] In some embodiments, the thickness of the hydrophilic surface 10 is 10 - 100 nm.

[0042] In some embodiments, the hydrophilic surface 10 is engraved with micro-scale patterns, such as stripes, columns, etc., or engraved with regular repeating patterns, such as squares, hexagons, etc.

[0043] Working principle: The double hydrophilic surface shell-and-tube heat exchanger utilizes the hydrophilic surface 10. By setting double hydrophilic materials on the inner surface of the heat exchanger housing, the inner and outer surfaces of the heat exchanger are both hydrophilic. The hydrophilic function can reduce the thermal resistance between the tube wall of the heat exchanger housing and the air. When the fluid contacts the hydrophilic surface, tiny water droplets are formed, reducing the thermal resistance between the tube wall of the housing and the air and improving the heat transfer efficiency. At the same time, setting the liquid distributor assembly can make the fluid distribute more evenly when passing through the inner and outer surfaces of the heat exchanger housing, enabling the hydrophilic surface 10 to play a better role. The humidity detector 9 detects the humidity at a cycle of 60 seconds. When the humidity is too high or too low, an alarm will sound, and the relative humidity of the real-time air will be displayed on the dashboard, based on which the flow of the liquid distribution pipe can be adjusted.

[0044] Embodiment Two:

[0045] Based on Embodiment One, this embodiment provides another heat exchange method for the hollow spiral double hydrophilic surface shell-and-tube heat exchanger.

[0046] The second heat exchange medium is introduced into the housing 12 through the heat exchanger shell layer inlet pipe 8 at the lower part of the housing 12. The second heat exchange medium enters the housing 12 from the heat exchanger shell layer inlet pipe 8 at the lower part of the housing 12 and flows out of the housing 12 from the heat exchanger shell layer outlet pipe 4 at the upper part of the housing 12, that is, the hollow housing 12 is filled with the second heat exchange medium. At this time, the fluid in the liquid distributor only flows through the outer surface of the hollow spiral double hydrophilic surface shell-and-tube heat exchanger.

[0047] It should be noted that the second heat exchange medium in this embodiment is a fluid with low viscosity, and the fluid flow rate is large during the heat exchange process.

[0048] In this embodiment, the second heat exchange medium is water.

[0049] Embodiment Three:

[0050] This embodiment provides a manufacturing method for the hollow spiral amphiphilic hydrophilic surface shell-and-tube heat exchanger described in Embodiment 1. The steps are as follows: S1. Sandblast or chemically clean the inner and outer surfaces of the shell to ensure that the surfaces are free of oil stains, oxide layers, or impurities; S2. Uniformly coat a primer that is compatible with polytetrafluoroethylene; S3. Cure the primer through a high-temperature sintering process, and the temperature range is about 380°C - 420°C.

[0051] In this embodiment, using a primer that is compatible with polytetrafluoroethylene can improve the adhesion of the coating.

[0052] In the description of the present disclosure / application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indication will also change accordingly. It is only for the convenience of describing the present disclosure / application 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 a limitation to the present disclosure / application.

[0053] In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present disclosure / application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0054] In the description of the present disclosure / application, it should be noted that unless otherwise clearly specified and limited, the terms "install", "connect", and "couple" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure / application can be understood through specific situations.

[0055] The above is only the preferred embodiment of the present disclosure / application. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present disclosure / application, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present disclosure / application.

Claims

1. A hollow spiral amphiphilic shell-and-tube heat exchanger, characterized in that It includes a housing, a liquid distributor assembly, and a spiral heat exchange tube; The liquid distributor assembly is arranged at the top of the housing. After the fluid enters the liquid distributor assembly, it flows through the inner surface and the outer surface of the housing; The interior of the housing is hollow and fixedly connected with a spiral heat exchange tube; Both the inner and outer surfaces of the housing are covered with a hydrophilic surface.

2. The hollow spiral amphiphilic surface shell-and-tube heat exchanger according to claim 1, wherein The liquid distributor assembly includes a main groove, liquid distribution pipes, and an end distribution orifice plate. The end distribution orifice plate includes a first distribution groove and a second distribution groove, and the first distribution groove is located above the second distribution groove; The notch of the first distribution groove is tangent to the upper edge of the housing. After the fluid in the liquid distribution pipe enters the main groove, it flows through the outer surface of the housing through the first distribution groove; The notch of the second distribution groove is tangent to the inner surface at the upper end of the housing. After the fluid in the liquid distribution pipe enters the main groove, it flows through the inner surface of the housing through the second distribution groove.

3. The hollow spiral amphiphilic surface shell and tube heat exchanger according to claim 1, characterized in that, The spiral heat exchange tube includes a spiral tube inlet pipe and a spiral tube outlet pipe. The spiral tube inlet pipe is connected to the spiral heat exchange tube inlet port at the upper part of the housing and is used to introduce a first heat exchange medium into the spiral heat exchange tube; the spiral tube outlet pipe is connected to the spiral heat exchange tube outlet port at the lower part of the housing; A heat exchanger housing layer inlet pipe is arranged at the lower part of the housing and is used to introduce a second heat exchange medium into the housing, and a heat exchanger housing layer outlet pipe is arranged at the upper part of the housing; The fluid in the liquid distributor assembly is the same as the second heat exchange medium.

4. The hollow spiral amphiphilic shell-and-tube heat exchanger according to claim 2 or 3, characterized in that, A humidity detector is installed on the outer surface of the housing and is used to periodically monitor the relative humidity of the air. When it monitors that the relative humidity of the air exceeds the set range, it outputs an alarm signal.

5. The hollow spiral amphiphilic surface shell and tube heat exchanger according to claim 1 or 2, characterized in that, The outer surface of the housing is corrugated or spiral-shaped and is used to increase the contact area between the fluid and the outer surface of the housing.

6. The hollow spiral amphiphilic shell-and-tube heat exchanger according to claim 1, characterized in that, The hydrophilic surface is a fluorine-containing surface treatment agent.

7. The hollow spiral amphiphilic surface shell-and-tube heat exchanger according to claim 1 or 2, characterized in that, The contact angle between the hydrophilic surface and the fluid is 0° - 30°.

8. The hollow spiral amphiphilic shell-and-tube heat exchanger according to claim 1 or 2, characterized in that, The thickness of the hydrophilic surface is 10 - 100 nm.

9. The hollow spiral amphiphilic surface shell and tube heat exchanger according to claim 1 or 2, characterized in that, The hydrophilic surface is engraved with micron-scale patterns or regular repeated legends. The patterns include stripes and columns, and the legends include squares and hexagons.

10. A manufacturing method of the hollow spiral amphiphilic shell-and-tube heat exchanger according to any one of claims 1-9, characterized in that, It includes: Sandblasting or chemical cleaning the inner and outer surfaces of the housing and then coating with a primer containing polytetrafluoroethylene; Curing the primer by high-temperature sintering.

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