阅读说明：本技术 一种能有效增大端差温度的温差发电装置 (Temperature difference power generation device capable of effectively increasing end difference temperature ) 是由 齐聪 丁子 涂江林 王宇星 孙亮 于 2020-03-23 设计创作，主要内容包括：本发明公开了一种能有效增大端差温度的温差发电装置,包括集热装置、温差发电片组件和冷却系统,三者由上自下依次设置,温差发电片组件的高温端与集热装置下表面固定接触,冷却系统包括散热板、支架、亚克力板、蠕动泵和冷却水箱,散热板下表面和多个亚克力板组成换热腔,换热腔固定在支架上,冷却水箱通过蠕动泵及管路与换热腔形成循环回路,散热板上表面与温差发电片组件的低温端固定接触,所述集热装置为上表面具有选择性吸收薄膜的紫铜板,所述散热板下表面为波纹表面。本发明通过涂覆选择性吸收薄膜能有效提高高温端的集热效率,同时通过波纹表面能提高低温端的散热效率,从而有效增大端差温度,提高温差发电装置的发电能力。(The invention discloses a thermoelectric power generation device capable of effectively increasing end difference temperature, which comprises a heat collection device, a thermoelectric power generation sheet assembly and a cooling system, wherein the heat collection device, the thermoelectric power generation sheet assembly and the cooling system are sequentially arranged from top to bottom, the high-temperature end of the thermoelectric power generation sheet assembly is fixedly contacted with the lower surface of the heat collection device, the cooling system comprises a heat dissipation plate, a support, acrylic plates, a peristaltic pump and a cooling water tank, the lower surface of the heat dissipation plate and a plurality of acrylic plates form a heat exchange cavity, the heat exchange cavity is fixed on the support, the cooling water tank forms a circulation loop with the heat exchange cavity through the peristaltic pump and a pipeline, the upper surface of the heat dissipation plate is fixedly contacted with the low-temperature end of the thermoelectric power generation sheet assembly, the heat. The invention can effectively improve the heat collection efficiency of the high-temperature end by coating the selective absorption film, and can improve the heat dissipation efficiency of the low-temperature end by the corrugated surface, thereby effectively increasing the end difference temperature and improving the power generation capacity of the temperature difference power generation device.)

1. The utility model provides a can effectively increase thermoelectric generation device of end difference temperature, including heat collecting device, thermoelectric generation piece subassembly and cooling system, the three sets gradually from top to bottom, thermoelectric generation piece subassembly's high temperature end and heat collecting device lower fixed surface contact, cooling system includes the heating panel, and a support, the acrylic plate, peristaltic pump and coolant tank, the heat transfer chamber is constituteed to heating panel lower surface and a plurality of acrylic plate, the heat transfer chamber is fixed on the support, coolant tank passes through peristaltic pump and pipeline and heat transfer chamber formation circulation circuit, heating panel upper surface and thermoelectric generation piece subassembly's low temperature end fixed contact, a serial communication port, heat collecting device is the red copper board of the selective absorption film of upper surface, the heating panel lower surface is the ripple surface.

2. The thermoelectric power generation device according to claim 1, wherein the difference between the peaks and the valleys of the corrugations of the corrugated surface is 10mm, and the distance between the peaks is 2 mm.

3. The thermoelectric power generation device capable of effectively increasing the end difference temperature according to claim 1, wherein the copper plate with the selective absorption film is prepared by the steps of:

A. sol preparation:

1) weighing a certain amount of tetraethoxysilane, absolute ethyl alcohol, deionized water and hydrochloric acid, sequentially adding into a conical flask A, heating in a water bath, and magnetically stirring for 30min at the temperature of 60 ℃;

2) weighing a certain amount of salicylic acid and a certain amount of absolute ethyl alcohol, sequentially adding the salicylic acid and the absolute ethyl alcohol into the beaker B, and magnetically and continuously stirring the mixture at room temperature until the salicylic acid is fully dissolved in the absolute ethyl alcohol;

3) weighing a certain amount of polyethylene glycol, placing the polyethylene glycol into a beaker C, adding a certain amount of absolute ethyl alcohol, and fully mixing the mixture by magnetic stirring for 30-60 min at room temperature;

4) slowly dripping the solution stirred in the step 2) and the solution stirred in the step 3) into a conical flask A in sequence, and then magnetically stirring for 30-60 min under the condition of heating in a water bath at 60 ℃;

5) standing and aging the stirred solution for 24 hours until a dilute gel solution is formed; the volume mol ratio of the ethyl orthosilicate, the absolute ethyl alcohol, the deionized water, the hydrochloric acid and the salicylic acid is 1 (20-30) to 4-8) to 0.2 (1-3);

B. sol coating:

① polishing the upper surface of the copper plate with 400-mesh, 800-mesh and metallographic polishing machine, removing the surface oxide film, and placing in a culture dish;

② placing the red copper plate on a sucker of a spin coater, sucking a small amount of the dilute gel solution prepared in the step A by a dropper, and dripping the dilute gel solution on the upper surface of the red copper plate until the dilute gel solution is fully distributed on the whole substrate, and running the spin coater at the speed of 2000-4000 r/min for 30-60 s;

③ placing the red copper plate into an air-blast drying oven, heating to 80 ℃, and keeping the temperature for 20-40 min, thereby forming a dry gel film on the upper surface of the red copper plate;

C. film heat treatment: putting the red copper plate with the xerogel film processed in the step B into a nitrogen-protected tube furnace, heating to 600-900 ℃ at a heating rate of 20 ℃/min, preserving heat for 1-2 h, cooling the furnace to room temperature, and taking out to obtain the copper-nickel-silicon dioxide composite material with C-SiO characteristics₂A copper plate for selective absorption of the film.

4. The thermoelectric power generation device capable of effectively increasing end difference temperature according to claim 3, wherein the prepared C-SiO₂The absorptivity of the selective absorption film to solar energy is more than 90%.

Technical Field

The invention relates to a temperature difference power generation device, in particular to a temperature difference power generation device capable of effectively increasing end difference temperature.

Background

With the gradual depletion of fossil energy and the aggravation of environmental pollution, solar energy is widely concerned by researchers in various countries as a clean energy, and a thermoelectric power generation technology is one of application technologies utilizing solar energy. The thermoelectric generation technology is based on the seebeck effect, and after temperature differences exist between the upper surface and the lower surface of the thermoelectric generation sheet, electromotive force is generated to output electric energy. The larger the end difference temperature of the high and low temperature ends of the thermoelectric generation piece is, the larger the capacity of the thermoelectric generation piece for outputting electric energy is. Therefore, increasing the temperature difference between the high and low temperature ends is an important part in improving the output power efficiency of the thermoelectric power generation device.

The radiation of solar energy is the emission of approximate blackbody, almost all object surfaces that receive solar radiation can produce the heat effect, but these materials can not all absorb the solar energy with high efficiency and utilize heat energy to produce heat energy, want the temperature of furthest improvement thermoelectric generation piece high temperature end, need carry out some customized designs to the thermal-arrest board of high temperature end, the thermal-arrest board material will be can be fine absorption solar energy at first, and the material itself thermal radiation performance is low, the thermal-arrest board material just can collect heat energy more efficiently, at present mainly adopt the copper plate as the thermal-arrest board material, but its thermal-arrest effect is general. In addition, the application of water cooling heat dissipation in the heat dissipation field is the most extensive cooling technology with better cooling effect at present, and the temperature of the low-temperature end of the thermoelectric power generation device can be effectively reduced.

Through search, Chinese patent with publication number CN209823664U and publication date of 2019, 12 months and 20 days, discloses a solar thermoelectric power generation device.

Chinese patent, publication No. CN110630541A, published as 2019, 12 and 31, which discloses a temperature difference spray fan device.

Analysis finds that the thermoelectric power generation prospect is considered, the thermoelectric power generation system has two defects, namely, the system has poor heat collection effect, or the heat collection material has short service life and is not suitable for long-time work; secondly, the heat dissipation device of the system is not designed for the structure of the internal heat dissipation surface, and the existing heat dissipation surface is a smooth plane, so that the heat exchange efficiency of the cooling system is limited, the temperature of the low-temperature end of the thermoelectric power generation device cannot be effectively reduced, the end difference temperature of the high-temperature end and the low-temperature end of the whole system is smaller, and the energy utilization rate is low. How to provide a thermoelectric power generation device with high-temperature end capable of efficiently collecting heat and low-temperature end capable of dissipating heat is the research direction of technicians in the field.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the thermoelectric power generation device capable of effectively increasing the end difference temperature, the heat collection efficiency of the high-temperature end can be effectively improved by coating the selective absorption film, and the heat dissipation efficiency of the low-temperature end can be improved by the corrugated surface, so that the end difference temperature is effectively increased, and the power generation capacity of the thermoelectric power generation device is improved.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a can effectively increase thermoelectric generation device of end difference temperature, including heat collecting device, thermoelectric generation piece subassembly and cooling system, the three sets gradually from top to bottom, thermoelectric generation piece subassembly's high temperature end and heat collecting device lower fixed surface contact, cooling system includes the heating panel, and a support, the ya keli board, peristaltic pump and coolant tank, the heat transfer chamber is constituteed to heating panel lower surface and a plurality of ya keli board, and the heat transfer chamber is fixed on the support, and coolant tank passes through peristaltic pump and pipeline and heat transfer chamber formation circulation circuit, heating panel upper surface and thermoelectric generation piece subassembly's low temperature end fixed contact, heat collecting device is the red copper board of the selective absorption film of upper surface, the heating panel lower surface is the ripple surface.

Further, the difference between the corrugation peaks and the corrugation valleys of the corrugated surface is 10mm, and the peak distance is 2 mm.

The preparation method of the red copper plate with the selective absorption film comprises the following steps:

A. sol preparation:

1) weighing a certain amount of Tetraethoxysilane (TEOS), absolute ethyl alcohol (EtOH) and deionized water (H)₂O) and hydrochloric acid (HCl) are sequentially added into the conical flask A, and magnetic stirring is carried out for 30min under the condition of heating in water bath at 60 ℃;

2) weighing a certain amount of Salicylic Acid (SA) and a certain amount of absolute ethyl alcohol, sequentially adding into the beaker B, and magnetically and continuously stirring at room temperature until the salicylic acid is fully dissolved in the absolute ethyl alcohol;

3) weighing a certain amount of polyethylene glycol, placing the polyethylene glycol into a beaker C, adding a certain amount of absolute ethyl alcohol, and fully mixing the mixture by magnetic stirring for 30-60 min at room temperature;

4) slowly dripping the solution stirred in the step 2) and the solution stirred in the step 3) into a conical flask A in sequence, and then magnetically stirring for 30-60 min under the condition of heating in a water bath at 60 ℃;

5) standing and aging the stirred solution for 24 hours until a dilute gel solution is formed; the volume mol ratio of the ethyl orthosilicate, the absolute ethyl alcohol, the deionized water, the hydrochloric acid and the salicylic acid is 1 (20-30) to 4-8) to 0.2 (1-3);

B. sol coating:

① polishing the upper surface of the copper plate with 400-mesh, 800-mesh and metallographic polishing machine, removing the surface oxide film, and placing in a culture dish;

② placing the red copper plate on a sucker of a spin coater, sucking a small amount of the dilute gel solution prepared in the step A by a dropper, and dripping the dilute gel solution on the upper surface of the red copper plate until the dilute gel solution is fully distributed on the whole substrate, and running the spin coater at the speed of 2000-4000 r/min for 30-60 s;

③ placing the red copper plate into an air-blast drying oven, heating to 80 ℃, and keeping the temperature for 20-40 min, thereby forming a dry gel film on the upper surface of the red copper plate;

C. film heat treatment: putting the red copper plate with the xerogel film processed in the step B into a nitrogen-protected tube furnace, heating to 600-900 ℃ at a heating rate of 20 ℃/min, preserving heat for 1-2 h, cooling the furnace to room temperature, and taking out to obtain the copper-nickel-silicon dioxide composite material with C-SiO characteristics₂A copper plate for selective absorption of the film.

Further, the prepared C-SiO₂The absorptivity of the selective absorption film to solar energy is more than 90%.

Compared with the prior art, the invention adopts the method of preparing the silicon dioxide film with C-SiO₂The red copper plate of the selective absorption film and the lower surface of the heat dissipation plate are both corrugated surfaces to be combined to manufacture the thermoelectric generator,sunlight is irradiated on the surface of the material with C-SiO₂Tests show that the selective absorption film prepared by the invention has lower reflectivity at a waveband of 0.3-2.5 microns and higher absorption performance, and the reflectivity is steeply increased at a position of 2.5-25 microns, so that the selective absorption film has lower infrared radiance, namely the selective absorption film has selective absorption characteristics, so that the selective absorption film can effectively absorb the radiant energy in an ultraviolet-visible light-near infrared light region and generate heat on the surface of the copper plate, and further transmit the heat to the high-temperature end of the thermoelectric power generation sheet assembly, and the temperature of the high-temperature end of the thermoelectric power generation sheet assembly is effectively increased; meanwhile, the cooling system works, the peristaltic pump drives cooling water to enter the heat exchange cavity from the cooling water tank, the cooling water is in contact with the lower surface of the cooling fin in the heat exchange cavity for heat exchange, so that the temperature of the cooling fin is reduced, and the contact area and the contact time of the cooling water and the cooling fin can be effectively increased due to the corrugated surface of the lower surface of the cooling fin, so that the heat exchange efficiency of the cooling fin and the cooling water is ensured; therefore, by the action, the heat collection temperature of the high-temperature end of the thermoelectric power generation piece assembly can be effectively improved, the temperature of the low-temperature end of the thermoelectric power generation piece assembly can be reduced, the end difference temperature of the high-temperature end and the low-temperature end is increased, and the power generation efficiency of the thermoelectric power generator is effectively increased finally; in addition, the invention prepares the material with C-SiO₂The red copper plate for selectively absorbing the film has simple process and no pollution, can realize the utilization of energy of more than 99 percent of solar radiation, and has the film photo-thermal conversion efficiency of more than 90 percent.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic diagram of the preparation of a catalyst having C-SiO₂A process flow diagram of a red copper plate of the selective absorption film;

FIG. 3 is a graph showing the reflectance at an illumination wavelength of 0.3 μm to 2.5 μm for examples 1, 2, 3 and a control group when the experiment was conducted;

FIG. 4 shows the reflectance spectra of examples 1, 2 and 3 at the illumination wavelength of 2.5 μm to 25 μm, as proved by experiments.

In the figure: 1. the solar thermoelectric generation module comprises a heat collecting device, 2, a thermoelectric generation sheet assembly, 3, a heat dissipation plate, 4, a support, 5, an acrylic plate, 6 and a heat exchange cavity.

Detailed Description

The present invention will be further explained below.