塔式太阳能热发电系统聚焦光斑能流密度测量方法研究
发布时间：2018-10-08 15:47
【摘要】：在塔式太阳能热发电系统中,聚焦光斑能流密度的分布是一项重要参数。它的测量对吸热器和定日镜场的性能评估及系统安全监控有重要作用。能流密度的连续测量可以促进吸热器的高效运行和定日镜的定点控制。对于给定的吸热器,系统的优化程度取决于最佳接收位置和能流分布的均匀性,这些参数是通过修改定日镜的跟踪参数和反射面曲率来改变的。接收面上的能流分布的优化可以最大限度地增加吸热器输入功率,降低吸热器上的能流密度峰值,从而减小热压力和可能的破坏。本课题的研究目的是在国内外理论与实践的基础上对塔式太阳能热发电系统中的聚焦光斑能流密度分布的测量方法进行研究,设计一套可用于商业太阳能电站吸热器表面能流密度测量的系统。完成的主要工作如下:1.了解了太阳能热发电系统的研究现状及已有的各种能流密度测量方法。2.对基于“PHLUX”法的新型能流密度间接测量法进行了原理论证和公式推导,并以其为基础进行了matlab程序的编写,得到了可以对输入图形和数据进行处理并输出光斑的能流密度分布相关信息的GUI界面。3.计算了不同聚光比和漫反射板反射率条件下所需的最佳中性密度滤光片衰减比,进行了中性密度衰减片的产品调研。4.进行了实验研究,得到了近球面反射镜聚焦光斑能流密度分布的测量结果。根据光学模型计算了所测量的光斑能量的理论值,其中定日镜上光线的入射角通过使用全站仪测量得到。以光斑能量的理论计算值为参考,根据测量值与其的偏差评价了该测量方法的不确定度。5.通过实验比较了三种不同材料和价格的漫反射板的反射特性,为将来的漫反射材料选择提供了参考。6.从理论公式出发,分析了所研究测量方法的各种可能的不确定度因素,并提出了部分解决方案。
[Abstract]:The distribution of energy flux density of focusing spot is an important parameter in tower solar thermal power generation system. Its measurement plays an important role in the performance evaluation and system safety monitoring of the absorber and helioscope field. The continuous measurement of the energy flow density can promote the efficient operation of the absorber and the control of the fixed point of the helioscope. For a given absorber, the system optimization depends on the optimal receiving position and uniformity of the energy flow distribution. These parameters are changed by modifying the tracking parameters of the helioscope and the curvature of the reflector. The optimization of the energy flow distribution on the receiving surface can increase the input power of the absorber to the maximum extent and reduce the peak energy flow density on the receiver, thus reducing the thermal pressure and possible damage. The purpose of this paper is to study the measurement method of energy flow density distribution of focused spot in tower solar thermal power generation system on the basis of theory and practice at home and abroad. A system for measuring the surface energy flux density of a commercial solar power station absorber is designed. The main work accomplished is as follows: 1: 1. The research status of solar thermal power generation system and the existing energy flux density measurement methods. 2. 2. The principle and formula of the new indirect energy flow density measurement method based on "PHLUX" method are demonstrated and deduced, and the matlab program is written on the basis of it. The GUI interface. 3, which can process the input graphics and data and output the energy flow density distribution information of the spot, is obtained. The optimum attenuation ratio of neutral density filter was calculated under the conditions of different light concentration ratio and diffuse reflectivity. The product investigation of neutral density attenuation plate was carried out. The experimental results of the energy flow density distribution of the focusing spot of the near-spherical mirror are obtained. The theoretical values of the measured spot energy are calculated according to the optical model, in which the incident angle of the light on the helioscope is measured by using a total station. The uncertainty of the method is evaluated according to the deviation between the measured value and the theoretical calculation value of the spot energy. The reflection characteristics of three kinds of diffuser plates with different materials and prices are compared through experiments, which provides a reference for the selection of diffuse reflectors in the future. Based on the theoretical formula, various possible uncertainty factors of the measurement methods studied are analyzed, and some solutions are put forward.
【学位授予单位】：中国科学院研究生院(长春光学精密机械与物理研究所)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM615
本文编号：2257333
[Abstract]:The distribution of energy flux density of focusing spot is an important parameter in tower solar thermal power generation system. Its measurement plays an important role in the performance evaluation and system safety monitoring of the absorber and helioscope field. The continuous measurement of the energy flow density can promote the efficient operation of the absorber and the control of the fixed point of the helioscope. For a given absorber, the system optimization depends on the optimal receiving position and uniformity of the energy flow distribution. These parameters are changed by modifying the tracking parameters of the helioscope and the curvature of the reflector. The optimization of the energy flow distribution on the receiving surface can increase the input power of the absorber to the maximum extent and reduce the peak energy flow density on the receiver, thus reducing the thermal pressure and possible damage. The purpose of this paper is to study the measurement method of energy flow density distribution of focused spot in tower solar thermal power generation system on the basis of theory and practice at home and abroad. A system for measuring the surface energy flux density of a commercial solar power station absorber is designed. The main work accomplished is as follows: 1: 1. The research status of solar thermal power generation system and the existing energy flux density measurement methods. 2. 2. The principle and formula of the new indirect energy flow density measurement method based on "PHLUX" method are demonstrated and deduced, and the matlab program is written on the basis of it. The GUI interface. 3, which can process the input graphics and data and output the energy flow density distribution information of the spot, is obtained. The optimum attenuation ratio of neutral density filter was calculated under the conditions of different light concentration ratio and diffuse reflectivity. The product investigation of neutral density attenuation plate was carried out. The experimental results of the energy flow density distribution of the focusing spot of the near-spherical mirror are obtained. The theoretical values of the measured spot energy are calculated according to the optical model, in which the incident angle of the light on the helioscope is measured by using a total station. The uncertainty of the method is evaluated according to the deviation between the measured value and the theoretical calculation value of the spot energy. The reflection characteristics of three kinds of diffuser plates with different materials and prices are compared through experiments, which provides a reference for the selection of diffuse reflectors in the future. Based on the theoretical formula, various possible uncertainty factors of the measurement methods studied are analyzed, and some solutions are put forward.
【学位授予单位】：中国科学院研究生院(长春光学精密机械与物理研究所)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM615
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