Selective Coatings for New Concepts of Parabolic Trough Collectors
Selective Coatings for New Concepts of Parabolic Trough Collectors
复制标题
用于抛物面槽式集热器新概念的选择性涂层
DOI：
10.1016/j.egypro.2014.03.004
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H. Cachafeiro
中科院分区：
文献类型：
--
作者：
J. Barriga;U. Ruiz;J. Goikoetxea;B. Coto;H. Cachafeiro
基于抛物槽式太阳能集热器的光热发电技术是目前所有光热发电设计中，从以往的运行经验和科技研发来看最为成熟的。目前的抛物线槽设计处理吸收器收集管中的最高工作温度约400 °C，但最近的一些设计计划将工作温度提高到600 °C，将性能提高5-10%，以达到市场需求的提高的生产率。25年。接收器的关键点之一是形成选择性吸收器涂层的层的堆叠。该涂层的典型光学值为在400 °C下>95%的吸光度和10%的发射率。在HITECO欧盟资助的项目中，正在测试收集器的新模块概念。采用这种新设计，涂层必须满足新的要求，因为收集器将在600 °C和10- 2 mbar的低真空下工作。IK 4-Tekniker的作者在HITECO项目中合作建立了一个溅射系统，将这些新涂层升级到4米长的管，用于一组实验收集器中的应用，由ARIES Ingeniería y sistemas S.A.进行项目协调。因此，有必要建立表征方法和标准，以保证高温涂料的性能、耐久性和质量控制。为此，一个新的欧盟资助的项目NECSO旨在设计加速老化协议，以测试这些涂层在新设计中更具侵略性的条件下的演变。
The CSP technology based on parabolic trough solar collector for large electricity generation purposes is currently the most mature of all CSP designs in terms of previous operation experience and scientific and technical research and development. The current parabolic trough design deals with a maximum operating temperature around 400 °C in the absorber collector tube but some recent designs are planned to increase the working temperature to 600 °C increasing the performance by 5-10% to attain the improved productivity that the market demands .These systems are expected to be working during 20-25 years.One of the key points of the receiver is the stack of layers forming the selective absorber coating. Typical optical values for this coating are >95% of absorbance and 10% of emittance at 400 °C. In the HITECO EU funded project a new modular concept of collector is being tested. With this new design the coating has to fulfill new requirements as the collector will be working at 600 °C and in a low vacuum of 10-2mbar. The authors from IK4-Tekniker have collaborated in the HITECO project building a sputtering system to upscale these new coatings to 4 meters long tubes for the application in a set of experimental collectors, being the project coordination done by ARIES Ingeniería y sistemas S.A.However, there is a great lack of knowledge about the performance of the absorber coatings during the whole life of the receiver. So, it is necessary to establish characterization methods and standards to guarantee the performance, durability and quality control of high temperature coatings. For this purpose, a new EU funded project called NECSO, aims to design accelerated ageing protocols to test the evolution of these coatings under more aggressive conditions in the new designs.