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Protective coating for central tower receiver in solar power plants and method of making same

A protective layer and solar energy technology, applied in solar thermal power generation, components of solar collectors, solar collectors, etc., can solve problems such as instability of the absorbing layer

Inactive Publication Date: 2020-03-31
RIOGLASS SOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AR increases the absorption rate by 1%-2%, but the absorption layer is unstable and degrades at 250°C

Method used

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  • Protective coating for central tower receiver in solar power plants and method of making same
  • Protective coating for central tower receiver in solar power plants and method of making same
  • Protective coating for central tower receiver in solar power plants and method of making same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Example 1: Layer A

[0042] An Inconel plate was used as the substrate, representing the surface of the Inconel tube. The Inconel plates were washed with soap, scrubbed, rinsed with water and given a second wash with isopropanol (IPA). The panels were dried and subjected to grit blasting. The panels were coated with a black absorbing lacquer comprising manganese ferrite (black spinel) in a silicone binder using the airbrush method to form the absorbing layer. The panels were dried at room temperature for 24 hours and then cured in an oven. The cure profile was heating to 248°C at 5°C / min for 55 minutes, holding at 248°C for 2 hours, heating at 5°C / min for 55 minutes to 538°C and holding at 538°C for 2 hours.

example 2

[0043] Example 2: Layer B

[0044] Layer B comprises silica gel and silicon oxide nanoparticles having a particle size of 20-40 nm to form nano-sized structural elements in the range of 100 to 200 nm after curing. Adding a commercial colloidal solution of silica gel with silica nanoparticles to the solvent allows the pH of the solution to be changed to enable a chemical reaction, which increases the optical density of the solution. The silica gel-silica particle solution was airbrushed onto Layer A comprising the black spinel-oxide-silicone layer and cured using the same cure profile used for absorber layer A.

example 3

[0045] Example 3: Layer C

[0046] Layer C comprises silica polymer chains obtained by hydrolysis of tetraethylorthosilicate (TEOS) with an acid solution. Airbrush silicone onto Layer A and cure using the same cure profile used for Absorbent Layer A.

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Abstract

A coating for solar tubes may include a porous absorbing layer that includes an absorbing black pigment material mixed with a porous binder having an open porosity; and a first protective layer comprising oxides applied on top of the porous absorbing layer. The first protective layer may penetrate to at least a portion of the open porosity. The first protective layer may include nanoparticles, toimprove the filling of the pores. A second protective layer may be applied after the first layer, to improve the filling of the remaining gaps.

Description

Background technique [0001] Solar tower technology captures and concentrates solar radiation to provide heat and generate electricity. Solar tower systems utilize mirrors (heliostats) to focus sunlight onto a central tower receiver (CTR). The central receiver consists of several panels, each made of small metal tubes, for example of Inconel 625, stainless steel, Hayne 230 etc. and coated with a black coating absorber. Heat transfer fluid (HTF) flows inside these small metal tubes. Central tower receivers are exposed to extreme operating conditions such as temperatures above 600°C, high radiation flux, thermal shock and corrosive environments. Under these conditions, accelerated degradation and aging of the black coating absorber is the main reason for the degradation of the thermal performance of these tubes, which in turn shortens the service life of the receiver. [0002] Therefore, the material chosen for coating these tubes can have a large impact on the performance and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/32F24S70/10F24S70/30F24S70/60
CPCC09D5/32F24S70/30F24S70/10F24S70/20F24S20/20F24S70/12F24S70/16Y02E10/40
Inventor 卡米尔·茨维克尔
Owner RIOGLASS SOLAR