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Groove type solar medium-temperature selective absorption coating

A technology of trough solar energy and absorbing coatings, which is applied in the direction of solar thermal power generation, solar thermal devices, layered products, etc., can solve the problems of thermal efficiency decline, infrared emissivity increase, collector heat loss increase, etc., to achieve enhanced Absorption effect, high absorption rate, effect of reducing work cost

Inactive Publication Date: 2014-05-14
SUZHOU JIAYAN ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, under medium temperature conditions, because the infrared emissivity increases significantly with the increase of temperature, the heat loss of the collector increases significantly, and the thermal efficiency decreases significantly.

Method used

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Examples

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Embodiment 1

[0025] The trough type solar energy medium temperature absorbing coating of the present invention comprises four layers of film, and from base body to surface is infrared reflective layer, first absorbing layer, second absorbing layer and anti-reflection layer successively, and described infrared reflective layer is made up of Ni film, and thickness is 20-120nm; the first absorption layer is a Ni+NiAl film with a thickness of 50-75nm, and the content of NiAl is 25-35wt%; the second absorption layer is a Ni+NiAl film with a thickness of 75-150nm, and the content of NiAl 35-50wt%; the antireflection layer is a NiO film with a thickness of 25-50nm. The performance of the solar selective absorbing coating prepared by the invention is as follows: after the coating is annealed in vacuum at 400 DEG C for 1 hour, the absorption rate of the coating is 90%-92%.

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Abstract

The invention relates to a groove type solar medium-temperature selective absorption coating, which sequentially comprises an infrared reflecting layer, a first absorption layer, a second absorption layer and an antireflection layer from the base to the surface. The raw materials of the coating are conventional materials, the groove type solar medium-temperature selective absorption coating is wide in application range, high in molding performance and low in price and can be processed into columnar targets, the target utilization rate is obviously improved, and the operating cost can be reduced further; and moreover, the groove type solar high-temperature selective absorption coating is suitable for solar thermal collector tubes with medium operating temperature.

Description

technical field [0001] The invention relates to the field of trough-type solar medium-temperature thermal power generation, in particular to a coating for selectively absorbing solar energy in a medium-temperature heat collection tube. Background technique [0002] Solar thermal power generation is an important technical approach for large-scale development and utilization of solar energy. At present, there are tower, trough, and dish systems, among which trough and tower systems are more commercially used, especially trough solar thermal power generation, which is the most popular so far. So far, it is the only mature technology in the world that has been commercialized for 20 years, and its cost is much lower than that of photovoltaic power generation. The energy storage system of the trough-type concentrating thermal power generation system can realize 24-hour operation. With the increase of scale, the cost of power generation is also very competitive. At present, the fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/50B32B15/01
CPCY02E10/40
Inventor 葛波
Owner SUZHOU JIAYAN ENERGY EQUIP
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