阅读说明：本技术 一种太阳能光热转换元器件及其加工方法 (Solar photo-thermal conversion component and processing method thereof ) 是由 谢剑 徐进良 佘青汀 梁聪 李文霄 于 2019-09-27 设计创作，主要内容包括：本发明属于太阳能转换技术领域,尤其涉及一种太阳能光热转换元器件及其加工方法。太阳能光热转换元器件由多根透明管通过束带捆扎而成,透明管外壁沿轴向形成条纹状平行圆环,圆环由金属颗粒组成。加工方法,包括：通过超声震荡将金属颗粒分散在溶液中配置成纳米流体；将捆扎的一束透明管浸泡在纳米流体中；将浸泡过纳米流体的透明管管束放入烧结炉中,依次高温加热、保温一定时间,然后冷却到室温。本发明巧妙地利用纳米流体在受限空间蒸发,在透明管外壁面自组装纳米颗粒,形成元器件,避免了纳米颗粒在液体中团聚、沉降并影响太阳能光热转换系统效率和安全。(The invention belongs to the technical field of solar energy conversion, and particularly relates to a solar photo-thermal conversion component and a processing method thereof. The solar photo-thermal conversion component is formed by bundling a plurality of transparent tubes through a bundling belt, the outer walls of the transparent tubes form stripe-shaped parallel circular rings along the axial direction, and the circular rings are composed of metal particles. The processing method comprises the following steps: dispersing metal particles in the solution by ultrasonic oscillation to prepare nanofluid; soaking a bundle of bundled transparent tubes in nano fluid; and (3) putting the transparent tube bundle soaked with the nanofluid into a sintering furnace, sequentially heating at high temperature, preserving heat for a certain time, and then cooling to room temperature. The invention skillfully utilizes the evaporation of the nanometer fluid in the limited space to self-assemble the nanometer particles on the outer wall surface of the transparent tube to form a component, thereby avoiding the aggregation and sedimentation of the nanometer particles in the liquid and influencing the efficiency and the safety of the solar photo-thermal conversion system.)

1. A solar photo-thermal conversion component is characterized by being formed by bundling a plurality of transparent tubes through a bundling belt, wherein stripe-shaped parallel circular rings are formed on the outer walls of the transparent tubes along the axial direction, and the circular rings are composed of metal particles.

2. The solar photo-thermal conversion component as claimed in claim 1, wherein the diameters of the transparent tubes are all in millimeter order, and the diameter of the inner transparent tube is smaller than that of the outer transparent tube.

3. The solar photo-thermal conversion component as claimed in claim 1, wherein the strap is made of shape memory alloy.

4. The solar photo-thermal conversion component according to claim 1, wherein the metal particles are nano-sized and ellipsoidal.

5. The solar photo-thermal conversion component according to claim 1, wherein the width and the distance of the circular rings are on the order of 100 nm and close to the wavelength of light.

6. The solar photo-thermal conversion component of claim 1, wherein when the solar photo-thermal conversion component works, the solar photo-thermal conversion component is inserted into liquid, and the metal particles on the transparent tube realize plasmon resonance absorption of light and convert the light into heat energy, so that the liquid is heated into steam, and a heat source or a power source is provided.

7. A processing method of the solar photo-thermal conversion component based on any one of claims 1 to 6 is characterized by comprising the following steps:

dispersing metal particles in the solution by ultrasonic oscillation to prepare nanofluid;

soaking a bundle of bundled transparent tubes in nano fluid;

and (3) putting the transparent tube bundle soaked with the nanofluid into a sintering furnace, sequentially heating at high temperature, preserving heat for a certain time, and then cooling to room temperature.

8. The processing method of the solar photo-thermal conversion component according to claim 7, wherein the solution comprises: volatile and nontoxic solution containing alcohol and n-hexane.

9. The processing method of the solar photo-thermal conversion component according to claim 7, wherein the contact line of the nanofluid and the transparent tube in the sintering furnace is withdrawn and evaporated along the axial direction of the transparent tube, metal particles in the nanofluid are deposited on the surface of the transparent tube, and the deposited metal particles adversely affect the movement of the contact line, resulting in discontinuous movement of the contact line; finally, the distribution of the metal particles in the transparent tube is not continuous, but self-assembled into rings with equal intervals; the metal particles diffuse heat to the outer wall of the transparent tube in the high-temperature environment of the sintering furnace, so that the metal particles are welded with the transparent tube.

10. The method for processing a solar photo-thermal conversion component according to claim 7, wherein the size and the spacing of the rings are adjusted by controlling the size of the gap between the transparent tubes, the concentration of the nanofluid and the withdrawal rate of the contact line.

Technical Field

The invention belongs to the technical field of solar energy conversion, and particularly relates to a solar photo-thermal conversion component and a processing method thereof.

Background

With the consumption of fossil fuels such as coal, oil, natural gas, etc., and the increasing global warming effect, the utilization of new energy such as solar energy is more and more important. At present, solar energy utilization is principally classified into photoelectric conversion and photothermal conversion. The photo-thermal conversion can be used for heating, refrigerating and the like, so that the energy conservation of the building is realized; in addition, the photo-thermal conversion can also generate steam to drive a steam turbine and a generator to generate electricity. Due to the plasmon resonance absorption principle of the nanoparticles, high heat conductivity coefficient and other properties, metal nanoparticles are often added into the fluid introduced into the solar heat exchanger to form nanofluid, so that the heat exchange effect is enhanced, the surface temperature of the photo-thermal conversion container is reduced, and the photo-thermal conversion efficiency is finally improved. However, the nanofluid is easy to agglomerate and settle in long-time operation, which not only deteriorates heat transfer performance, but also may cause blockage to system power equipment, thereby posing a safety threat. Therefore, a new solar photo-thermal conversion component is required to be sought, so that plasmon resonance absorption is realized on the solid surface, and the defects caused by application of nanofluid are avoided.

Disclosure of Invention

Aiming at the problems, the invention provides a solar photo-thermal conversion component and a processing method thereof.

A solar photo-thermal conversion component is formed by bundling a plurality of transparent tubes through a bundling belt, wherein the outer walls of the transparent tubes form parallel striped rings along the axial direction, and the rings are composed of metal particles.

The diameters of the transparent tubes are all in millimeter level, and the diameter of the inner transparent tube is smaller than that of the outer transparent tube.

The strap is made of shape memory alloy.

The metal particles are nano-sized and ellipsoidal.

The width and spacing of the rings is on the order of 100 nanometers, close to the wavelength of light.

When the solar photo-thermal conversion component works, the solar photo-thermal conversion component is inserted into liquid, and the metal particles on the transparent tube realize plasmon resonance absorption of light and convert the light into heat energy, so that the liquid is heated into steam, and a heat source or a power source is provided.

A processing method of a solar photo-thermal conversion component comprises the following steps:

dispersing metal particles in the solution by ultrasonic oscillation to prepare nanofluid;

soaking a bundle of bundled transparent tubes in nano fluid;

and (3) putting the transparent tube bundle soaked with the nanofluid into a sintering furnace, sequentially heating at high temperature, preserving heat for a certain time, and then cooling to room temperature.

The solution comprises the following components: volatile and nontoxic solution containing alcohol and n-hexane.

The contact line of the nano fluid and the transparent tube in the sintering furnace is withdrawn and evaporated along the axial direction of the transparent tube, metal particles in the nano fluid are deposited on the surface of the transparent tube, and the deposited metal particles adversely affect the motion of the contact line, so that the movement of the contact line is discontinuous; finally, the distribution of the metal particles in the transparent tube is not continuous, but self-assembled into rings with equal intervals; the metal particles diffuse heat to the outer wall of the transparent tube in the high-temperature environment of the sintering furnace, so that the metal particles are welded with the transparent tube.

The size and the distance of the circular rings are adjusted by controlling the size of the gap between the transparent tubes, the concentration of the nano fluid and the withdrawing rate of the contact line.

The invention has the beneficial effects that:

the invention skillfully utilizes the evaporation of the nanometer fluid in the limited space to self-assemble the nanometer particles on the outer wall surface of the transparent tube to form the component. The component manufacturing process has strong operability and low cost, can efficiently, reliably and controllably realize solar photo-thermal conversion, and avoids nanoparticles from agglomerating and settling in liquid and influencing the efficiency and safety of a solar photo-thermal conversion system.

The depth of the solar photo-thermal conversion element inserted into the liquid is changed, the photo-thermal conversion amount can be controlled, and the generated steam amount and heat quantity can be adjusted.

The bridle adopts shape memory alloy, when guaranteeing elasticity under high temperature, avoids the transparent tube to be crowded garrulous.

The width and the interval of the circular rings are close to the wavelength of light, so that plasmon resonance absorption of the light is facilitated, and the light is converted into heat energy.

Drawings

FIG. 1 is a schematic diagram of a solar photo-thermal conversion component structure and working principle of the invention

Fig. 2 is a schematic diagram of a preparation method and a preparation principle of a solar photo-thermal conversion component according to the invention.

Reference numbers in the figures: the solar energy photo-thermal conversion device comprises a solar photo-thermal conversion component 1, a liquid 2, a solar condenser 3, a sun 4, steam 5, a transparent tube 6, a bridle 7, metal particles 8, a ring 9, a solution 10, a nanofluid 11, a container 12, a sintering furnace 13, a gap 14 and a contact line 15.

Detailed Description

The invention is described in further detail below with reference to the attached drawing figures, but the invention is not limited in any way by the claims.

Fig. 1 is a schematic diagram of the structure and the working principle of a solar photo-thermal conversion component. When the solar photo-thermal conversion component 1 works, the solar photo-thermal conversion component is placed in a solar condenser 3 containing liquid 2, light waves emitted by the sun 4 are converted into heat energy through the surface plasmon resonance absorption principle, steam 5 is generated (as shown in figure 1a), and the heat energy is used for heating and refrigerating buildings or driving a steam turbine to drive a generator to generate electricity. The solar photo-thermal conversion component 1 is formed by closely arranging transparent tubes 6 with different diameters under the bundling of a binding band 7. The inner transparent tube 6 has a small diameter and the outer transparent tube 6 has a large diameter (see fig. 1 b). The bridle 7 is made of shape memory alloy, so that the transparent tube 6 is prevented from being crushed while the elasticity is ensured at high temperature. Each transparent tube 6 is welded with metal particles 8, and the metal particles 8 are self-assembled into parallel circular rings 9 on the outer wall of the transparent tube 6 (as shown in fig. 1 c). Preferably, the transparent tube 6 is of the order of millimetres in diameter; the width and the spacing of the circular rings 9 are 100 nanometers.

Fig. 2 is a schematic diagram of a preparation method and a preparation principle of a solar photo-thermal conversion component according to the invention. The preparation process mainly comprises two steps: first, as shown in fig. 2a, a nanofluid 11 is prepared by dispersing metal particles 8 in a solution 10 by means of ultrasonic oscillation, and is contained in a container 12. A bundle of transparent tubes 6 bundled by a band 7 is immersed in a nanofluid 11 contained in a container 12. Then, as shown in fig. 2b, the transparent tube 6 bundle soaked with the nanofluid 11 is placed into a sintering furnace 13, sequentially heated at a high temperature, kept at the temperature for a certain time, and then cooled to room temperature. Preferably, the sintering furnace is heated to 650 ℃ for 30 minutes, kept warm for 1 hour and then naturally cooled to room temperature. Preferably, the metal particles are 8 nanometers in size, ellipsoidal in shape and made of gold; the solution 10 is volatile and nontoxic solution such as alcohol and n-hexane, preferably n-hexane.

After the above two steps, the outer wall of the transparent tube 6 is welded with the self-organized metal particles 8, and the principle is as shown in fig. 2 c. The transparent tubes 6 are tightly arranged under the bundling of the binding bands 7, and gaps 14 are formed between the adjacent transparent tubes 6. After the bundle of transparent tubes 6 is soaked in the nanofluid 11, the nanofluid 11 fills the gap 14. When the transparent tube 6 bundle is put into a sintering furnace 13 to be heated, the solution 10 in the nanofluid 11 is evaporated, the contact line 15 between the nanofluid 11 and the transparent tube 6 is continuously withdrawn in the gap 14, and the metal particles 8 in the nanofluid 11 are deposited on the contact line. The deposited metal particles 8 in turn influence the movement of the contact wire 15, resulting in a discontinuous movement of the contact wire 15. Finally, the distribution of the metal particles 8 in the transparent tube 6 is not continuous, but self-organized into equally spaced rings 9. The metal particles 8 of the self-organizing annular ring 9 diffuse heat to the outer wall of the transparent tube 6 in the high temperature environment of the sintering furnace 13, thereby being welded with the transparent tube 6. The transparent tubes 6 welded with the self-organizing metal particles 8 are gathered into a bundle, and the solar photo-thermal conversion component is formed.

According to the invention, the nano particles 8 are orderly welded on the outer wall of the transparent tube 6 at low cost, and the solar photo-thermal conversion is efficiently, reliably and controllably realized by the surface plasmon resonance absorption principle, so that the nano particles 8 are prevented from agglomerating in the liquid 2 and influencing the efficiency and safety of a solar photo-thermal conversion system, and the method is an innovative technology and a key technology in the field of new energy utilization.