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Trench type intermediate-temperature coating for solar energy

A trough solar, medium temperature technology, applied in solar thermal power generation, solar thermal devices, layered products, etc., can solve the problems of increased infrared emissivity, decreased thermal efficiency, increased heat loss of collectors, etc., and achieves high absorption rate , the effect of enhancing the absorption effect and reducing the working cost

Inactive Publication Date: 2012-10-10
SUZHOU JIAYAN ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
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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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The medium temperature coating for trough solar energy of the present invention comprises four layers of films, from the substrate to the surface are followed by an infrared reflection layer, a first absorption layer, a second absorption layer and an anti-reflection layer, the infrared reflection layer is composed of a Ni film with a thickness of 20-120nm; the first absorption layer is a Ni+AlN film with a thickness of 50-75nm, and the content of AlN is 25-35wt%; the second absorption layer is a Ni+AlN film with a thickness of 75-150nm. Wherein the content of AlN is 35-50wt%; the anti-reflection layer is an AlN 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 trench type intermediate-temperature coating for solar energy. An infrared reflection layer, a first absorbing layer, a second absorbing layer and an antireflective layer are arranged from a base body to a surface of the intermediate-temperature coating in sequence. According to the coating, selected materials are all general materials, the application range is wide, the formability is good, the trench type intermediate-temperature coating can be processed to be a columnar target, the utilization ratio of the target is increased obviously, meanwhile, the cost is relatively low, and the work cost is reduced further. The trench type intermediate-temperature coating for solar energy is suitable for solar thermal collection tube with intermediate work 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 Applications(China)
IPC IPC(8): F24J2/46F24J2/50B32B15/01
CPCY02E10/40
Inventor 葛波
Owner SUZHOU JIAYAN ENERGY EQUIP
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