Device and preparation method for realizing water collection and phase change heat storage functions at the same time

Abstract

The present invention discloses a device that realizes the functions of water collection and phase change heat storage at the same time and a preparation method thereof. The device comprises a phase change ball, a super hydrophobic hemispherical shell and super hydrophilic small balls; a plurality of super hydrophilic small balls are evenly nested in spherical pits on the periphery of the super hydrophobic hemispherical shell; a plurality of super hydrophobic hemispherical shells are fixed on the periphery of the phase change ball; the phase change ball comprises a spherical shell and a top packaging cover, the spherical shell is filled with phase change material, and the top packaging cover is detachably connected to the spherical shell. The device of the present invention realizes the functions of collecting moisture in flue gas and utilizing the waste heat of flue gas at the same time, and the preparation process is simple. The device is easy to use, and can store temporarily unused heat in the phase change material of the phase change ball, and release it by a certain method when it is needed, thereby achieving the purpose of storing and recycling thermal energy.

Description

Technical Field

[0001] The present invention relates to the technical field of phase change heat storage, and in particular to a device that realizes the functions of water collection and phase change heat storage at the same time and a preparation method thereof. Background Art

[0002] The Namib Desert in southern Africa has almost no rain all year round, but there is often thick fog and strong winds in the early morning or at night. The Stenocara beetles living in it can use their backs to collect moisture in the fog. When the beetles collect water, their heads face the wind direction, and their backs are about 45 degrees to the ground. After a period of time, small water droplets will form on the surface of their backs. By recording the beetles' water collection process, researchers found that small water droplets will form on certain points on the beetles' backs at the beginning of water collection, and then the small water droplets will slowly grow; when the wind speed is 5m / s, which is common in Namib, small water droplets with a diameter of 4-5mm will fall off from the back and flow smoothly into the beetles' mouths. This special environment not only requires the beetles' backs to collect small fog droplets in the wind, but also ensures that the water droplets on the back can grow smoothly and not be blown away by the wind before they fall into the beetles' mouths.

[0003] Phase change thermal storage technology uses phase change materials to absorb or release heat during phase change to achieve the purpose of heat storage and heat release. It can store temporarily unused preheated or excess heat in phase change materials, and release it through certain methods when needed. Phase change thermal storage technology uses latent heat to store energy, and the heat storage density is higher than that of sensible heat storage. During the phase change thermal storage process, the phase change material is approximately constant temperature, and the temperature of the phase change material can be well controlled. Phase change thermal storage technology has the advantages of simple device, small size, easy use and controllable device temperature.

[0004] At present, domestic coal-fired power plants and steel sintering plants widely use wet desulfurization technology. The flue gas discharged after wet desulfurization technology carries a large amount of water vapor. The wet flue gas enters the ambient atmosphere with a lower temperature, which not only causes a large amount of water waste, but also forms a "white smoke" phenomenon, causing visual pollution and bringing huge social pressure to enterprises. Therefore, by simulating the structural characteristics of the beetle's back, preparing similar bionic materials, and combining the water collection characteristics of bionic materials with phase change thermal storage technology, not only can water resources be recycled in the flue gas, but also the waste heat of the flue gas can be used, which has an important impact on energy utilization and environmental protection.

[0005] However, the main disadvantage of existing water collection devices and phase change heat storage devices is that it is impossible to combine the water collection characteristics of bionic materials with phase change heat storage technology, and there is no device that can simultaneously recycle water resources and waste heat in flue gas. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention proposes a device and a preparation method thereof for simultaneously realizing water collection and phase change heat storage functions. The specific technical scheme is as follows:

[0007] A device for simultaneously realizing water collection and phase change heat storage functions, the device comprising a phase change ball, a super hydrophobic hemispherical shell and a super hydrophilic ball;

[0008] A plurality of the super-hydrophilic spheres are uniformly nested in the spherical pits on the outer periphery of the super-hydrophobic hemispherical shell;

[0009] A plurality of the super-hydrophobic hemispherical shells are fixed on the periphery of the phase change ball;

[0010] The phase change ball comprises a spherical shell and a top packaging cover. The spherical shell is filled with phase change material, and the top packaging cover is detachably connected to the spherical shell.

[0011] Furthermore, the phase change balls and super hydrophilic balls are both made of stainless steel.

[0012] Furthermore, the super-hydrophobic hemispherical shell is formed by mixing polydimethylsiloxane and a curing agent in a mass ratio of 10:1, adding 30% by mass of high thermal conductivity chopped carbon fibers to the mixture, and vacuum curing.

[0013] Furthermore, there are two super-hydrophobic hemispherical shells fixed face to face on the periphery of the phase change ball.

[0014] Furthermore, the distance between the center of the super-hydrophobic hemispherical shell and the center of the phase-change sphere is 0.1 times the diameter of the phase-change sphere.

[0015] Furthermore, the diameter of the super-hydrophilic beads is 0.05-0.1 times the outer diameter of the super-hydrophobic hemispherical shell; and the arrangement interval of the super-hydrophilic beads is 0.05-0.1 times the outer diameter of the super-hydrophobic hemispherical shell.

[0016] Furthermore, the phase change material filled in the phase change ball is erythritol.

[0017] A method for preparing a device that simultaneously realizes water collection and phase change heat storage functions, the method comprising the following steps:

[0018] Step 1: preparing a mold for a super-hydrophobic hemispherical shell;

[0019] Prepare a hemispherical shell, evenly apply a layer of glue on the inner surface, and evenly stick a plurality of hemispherical bodies on the inner surface of the hemispherical shell, wherein the diameter of the hemispherical body is equal to the diameter of the super hydrophilic ball, and the arrangement spacing of the hemispherical body is 0.05-0.1 times of the hemispherical shell, and after the glue is cured, a mold for preparing a super hydrophobic hemispherical shell is obtained;

[0020] Step 2: preparing phase change balls and filling the phase change balls with phase change materials;

[0021] Step 3: preparing a superhydrophobic hemispherical shell;

[0022] The polydimethylsiloxane and the curing agent are mixed in a mass ratio of 10:1, and 30% of the mass ratio of the high thermal conductivity chopped carbon fiber is added to the mixture and mixed evenly; the mixed liquid is evacuated; the phase change ball prepared in step 2 is placed above the mold of step 1, and the center of the phase change ball is at a preset distance from the center of the mold, and then the vacuumed mixture is placed in the gap formed by the mold and the phase change ball, and the device is heated and cured as a whole; the hemispherical shell and multiple hemispherical bodies are removed to obtain a hemispherical shell with pits on the surface; and then a surface modification spray of hydrophobic silane and silica nanoparticles is sprayed on the outer surface of the hemispherical shell with pits on the surface, and the surface is ventilated and dried until a super hydrophobic layer is formed on the outer surface of the hemispherical shell to obtain a super hydrophobic hemispherical shell;

[0023] Step 4: spraying the surface of the ball with a surface modification spray of hydrophobic silane and silica nanoparticles, and drying by ventilation until a super hydrophobic layer is formed on the surface of the ball; then plasma cleaning the ball to completely decompose the hydrophobic silane on the silica nanoparticles while maintaining the surface nanostructure, modifying the surface into a super hydrophilic surface, and obtaining a super hydrophilic ball;

[0024] Step 5: Paste the super-hydrophilic ball on the pit of the super-hydrophobic hemispherical shell, and then paste the super-hydrophobic hemispherical shell on the periphery of the phase change ball.

[0025] Furthermore, the glue in step one is epoxy resin AB glue.

[0026] The beneficial effects of the present invention are as follows:

[0027] The device of the present invention realizes the functions of water collection and phase change heat storage at the same time, realizes the functions of collecting water in smoke and utilizing the residual heat of smoke at the same time, and the preparation process is simple. The device is easy to use, and can store temporarily unused heat in the phase change material of the phase change ball, and release it by a certain method when it is needed, thereby achieving the purpose of heat energy storage and recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the device of the present invention that realizes the functions of water collection and phase change heat storage at the same time.

[0029] Figure 2 Schematic diagram of a hemispherical shell mold.

[0030] Figure 3Schematic diagram of preparing a superhydrophobic hemispherical shell by combining a phase change ball with a hemispherical shell mold.

[0031] In the figure, there are a phase change ball 1, a super hydrophobic hemispherical shell 2, a super hydrophilic small ball 3, an agate hemispherical body 4, a stainless steel hemispherical shell 5, a spherical shell 101 of the phase change ball, and a top packaging cover 102. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below based on the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more clear. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] like Figure 1 As shown, the device for realizing the functions of water collection and phase change heat storage at the same time of the present invention comprises a phase change ball 1, a super hydrophobic hemispherical shell 2 and a super hydrophilic ball 3. A plurality of super hydrophilic balls 3 are evenly nested in the spherical pits on the periphery of the super hydrophobic hemispherical shell 2; a plurality of super hydrophobic hemispherical shells 2 are fixed on the periphery of the phase change ball; the phase change ball 1 comprises a spherical shell 101 and a top packaging cover 102, the spherical shell 101 is used to fill the phase change material, and the top packaging cover 102 is detachably connected to the spherical shell 101.

[0034] The super-hydrophobic hemispherical shell 2 simulates the surface features of the back of a beetle in the desert, and the super-hydrophilic sphere 3 simulates the protrusions on the back of a beetle in the desert. The two are used together to collect moisture in the smoke.

[0035] In order to make the phase change ball 1 obtain excellent thermal conductivity and at the same time make the surface of the hydrophilic ball 3 obtain excellent surface modification effect, the phase change ball 1 and the super hydrophilic ball 3 are both made of stainless steel.

[0036] In order to make the super-hydrophobic hemispherical shell 2 have good thermal conductivity and the shell surface can be modified according to the preset structure, the super-hydrophobic hemispherical shell 2 is made by mixing polydimethylsiloxane and a curing agent in a mass ratio of 10:1, adding 30% of high thermal conductivity chopped carbon fibers to the mixture, and vacuum curing.

[0037] In order to ensure that the water has sufficient contact area with the super-hydrophobic hemispherical shell 2 and that the water droplets grow smoothly on the super-hydrophobic hemispherical shell 2 without being blown away, there are two super-hydrophobic hemispherical shells 2 fixed face to face on the periphery of the phase change ball 1 .

[0038] In order to make the thermal conductivity of the super-hydrophobic hemispherical shell 2 better, the thickness of the super-hydrophobic hemispherical shell 2 needs to be smaller, but the thickness of the super-hydrophobic hemispherical shell 2 cannot be less than the radius of the hydrophilic ball 3, and the distance between the center of the super-hydrophobic hemispherical shell 2 and the center of the phase-change ball 1 is 0.1 times the diameter of the phase-change ball. Because the super-hydrophobic hemispherical shell 2 is actually a thin film, it needs to be coated on the phase-change ball 1, and the thickness of the film cannot be too thick to prevent heat from being difficult to transfer to the inside of the phase-change ball 1.

[0039] The diameter of the super-hydrophilic ball 3 is 0.05-0.1 times the outer diameter of the super-hydrophobic hemispherical shell 2; the arrangement interval of the super-hydrophilic ball 3 is 0.05-0.1 times the outer diameter of the super-hydrophobic hemispherical shell 2, thereby fully achieving the bionic effect and making the water collection effect better.

[0040] The method for preparing the device for realizing the functions of water collection and phase change heat storage at the same time of the present invention specifically comprises the following steps:

[0041] Step 1: preparing a mold for a super-hydrophobic hemispherical shell;

[0042] Prepare a hemispherical shell, evenly apply a layer of glue on the inner surface, and evenly stick multiple hemispherical bodies on the inner surface of the hemispherical shell. The diameter of the hemispherical body is equal to the diameter of the super hydrophilic ball, and the arrangement spacing of the hemispherical body is 0.05-0.1 times of the hemispherical shell. After the glue is cured, a mold for preparing a super hydrophobic hemispherical shell is obtained; as one embodiment, the hemispherical shell is a stainless steel hemispherical shell, the glue can be epoxy resin AB glue, and the hemispherical body is agate hemisphere. The interval between the agate hemispheres is 1 mm. The prepared mold is placed for 24 hours before use.

[0043] Step 2: preparing phase change balls;

[0044] As one of the implementation modes, the phase change ball is made of stainless steel to make a spherical shell and a detachable top packaging cover;

[0045] Step 3: preparing a superhydrophobic hemispherical shell;

[0046] Polydimethylsiloxane and curing agent are mixed in a mass ratio of 10:1, and high thermal conductivity chopped carbon fibers (for improving the thermal conductivity) accounting for 30% of the mass ratio of the mixture are added to the mixture. Thermal conductivity of polydimethylsiloxane composites), mix evenly; place the mixed liquid in a vacuum drying oven, evacuate for 2 hours to remove bubbles inside the mixed liquid; place the phase change ball prepared in step 2 above the mold of step 1, and make the center of the phase change ball a preset distance from the center of the mold, then put the vacuumized mixture into the gap formed by the mold and the phase change ball, place the entire device in a vacuum drying oven, and heat it at 80 degrees Celsius for 2 hours to solidify it; remove the hemispherical shell and multiple hemispherical bodies to obtain a hemispherical shell with pits on the surface; then spray a surface modification spray of hydrophobic silane and silica nanoparticles on the outer surface of the hemispherical shell with pits on the surface, and ventilate and dry it, the spraying and ventilation drying can be repeated many times until a super-hydrophobic layer is formed on the outer surface of the hemispherical shell to obtain a super-hydrophobic hemispherical shell; through observation and measurement, it was found that the contact angle of the super-hydrophobic hemispherical shell was 138°;

[0047] Step 4: Spray the surface of the ball with a surface modification spray of hydrophobic silane and silica nanoparticles, ventilate and dry, spray and ventilate and dry can be repeated many times until a super hydrophobic layer is formed on the surface of the ball; then the ball is plasma cleaned to completely decompose the hydrophobic silane on the silica nanoparticles, while maintaining the nanostructure of the surface, modifying the surface to a super hydrophilic surface to obtain a super hydrophilic ball. When stainless steel balls are used in this embodiment, the contact angle of the stainless steel ball surface is 148° when the super hydrophobic layer is formed; after super hydrophilic treatment, the contact angle of the stainless steel ball is less than 1°, proving that the stainless steel ball has been successfully modified to a super hydrophilic ball;

[0048] Step 5: Paste the super hydrophilic ball on the pit of the super hydrophobic hemispherical shell, and then use epoxy resin AB glue to paste the two super hydrophobic hemispherical shells on the periphery of the phase change ball. Epoxy resin AB glue can be used when pasting, so as to form a device that realizes the functions of water collection and phase change heat storage at the same time.

[0049] The device of the present invention that realizes the functions of water collection and phase change heat storage at the same time is arranged on a steel frame and placed in the high-temperature flue at the tail of the power plant. When the flue temperature at the tail of the power plant is 100 degrees Celsius to 150 degrees Celsius, erythritol can be selected as the phase change material because erythritol has a high phase change latent heat and thermal conductivity at this temperature. When the flue gas flows through the device that realizes the functions of water collection and phase change heat storage at the same time, the moisture in the flue gas is collected by the bionic water collection surface, and the heat energy in the flue gas is used to convert erythritol from a solid state to a liquid state. This is the process of collecting moisture in the flue gas and absorbing heat energy in the flue gas.

[0050] The device of the present invention that realizes the functions of water collection and phase change heat storage at the same time is transferred and placed inside a cold flue. When cold gas flows through the flue, the erythritol in the device that realizes the functions of water collection and phase change heat storage at the same time solidifies from liquid to solid, and releases a large amount of heat, and the cold gas is preheated to hot gas.

[0051] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A method for preparing a device that simultaneously realizes water collection and phase change heat storage functions, characterized in that: The device that realizes the functions of water collection and phase change heat storage at the same time includes a phase change ball, a super hydrophobic hemispherical shell and a super hydrophilic ball; A plurality of the super-hydrophilic spheres are uniformly nested in the spherical pits on the outer periphery of the super-hydrophobic hemispherical shell; A plurality of the super-hydrophobic hemispherical shells are fixed on the periphery of the phase change ball; The phase change ball comprises a spherical shell and a top packaging cover, the spherical shell is filled with a phase change material, and the top packaging cover is detachably connected to the spherical shell; The preparation method comprises the following steps: Step 1: preparing a mold for a super-hydrophobic hemispherical shell; Prepare a hemispherical shell, evenly apply a layer of glue on the inner surface, and evenly stick a plurality of hemispherical bodies on the inner surface of the hemispherical shell, wherein the diameter of the hemispherical body is equal to the diameter of the super hydrophilic ball, and the arrangement spacing of the hemispherical body is 0.05-0.1 times of the hemispherical shell, and after the glue is cured, a mold for preparing a super hydrophobic hemispherical shell is obtained; Step 2: preparing phase change balls and filling the phase change balls with phase change materials; Step 3: preparing a superhydrophobic hemispherical shell; The polydimethylsiloxane and the curing agent are mixed in a mass ratio of 10:1, and 30% of the mass ratio of the high thermal conductivity chopped carbon fiber is added to the mixture, and the mixture is evenly mixed; the mixed liquid is evacuated; the phase change ball prepared in step 2 is placed above the mold of step 1, and the center of the phase change ball is at a preset distance from the center of the mold, and then the vacuumed mixture is placed in the gap formed by the mold and the phase change ball, and the device is heated and cured as a whole; the hemispherical shell and multiple hemispherical bodies are removed to obtain a hemispherical shell with pits on the surface; then the outer surface of the hemispherical shell with pits on the surface is sprayed with a surface modification spray of hydrophobic silane and silica nanoparticles, and ventilated and dried until a super-hydrophobic layer is formed on the outer surface of the hemispherical shell to obtain a super-hydrophobic hemispherical shell; Step 4: spraying the surface of the ball with a surface modification spray of hydrophobic silane and silica nanoparticles, and drying by ventilation until a super hydrophobic layer is formed on the surface of the ball; then plasma cleaning the ball to completely decompose the hydrophobic silane on the silica nanoparticles while maintaining the surface nanostructure, modifying the surface into a super hydrophilic surface, and obtaining a super hydrophilic ball; Step 5: Paste the super-hydrophilic ball on the pit of the super-hydrophobic hemispherical shell, and then paste the super-hydrophobic hemispherical shell on the periphery of the phase change ball.

2. The method for preparing the device for simultaneously realizing water collection and phase change heat storage functions according to claim 1, characterized in that: The phase change ball and the super hydrophilic ball are both made of stainless steel.

3. The method for preparing the device for simultaneously realizing water collection and phase change heat storage functions according to claim 1, characterized in that: The super-hydrophobic hemispherical shell is formed by mixing polydimethylsiloxane and a curing agent in a mass ratio of 10:1, adding 30% by mass of high thermal conductivity chopped carbon fibers to the mixture, and vacuum curing.

4. The method for preparing a device for simultaneously realizing water collection and phase change heat storage functions according to claim 1, characterized in that: The number of the super-hydrophobic hemispherical shells is two, and the shells are fixed face to face on the periphery of the phase change ball.

5. The method for preparing a device for simultaneously realizing water collection and phase change heat storage functions according to claim 1, characterized in that: The distance between the center of the super-hydrophobic hemispherical shell and the center of the phase-change sphere is 0.1 times the diameter of the phase-change sphere.

6. The method for preparing the device for simultaneously realizing water collection and phase change heat storage functions according to claim 1, characterized in that: The diameter of the super hydrophilic beads is 0.05-0.1 times the outer diameter of the super hydrophobic hemispherical shell; and the arrangement interval of the super hydrophilic beads is 0.05-0.1 times the outer diameter of the super hydrophobic hemispherical shell.

7. The method for preparing the device for simultaneously realizing water collection and phase change heat storage functions according to claim 1, characterized in that: The phase change material filled in the phase change ball is erythritol.

8. The method for preparing the device for simultaneously realizing water collection and phase change heat storage functions according to claim 1, characterized in that: The glue in step 1 is epoxy resin AB glue.

Images