太阳能喷射式发电系统的构建及其空气与低沸点工质的流动特性研究

项目名称： 太阳能喷射式发电系统的构建及其空气与低沸点工质的流动特性研究

项目编号： No.51266001

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 能源与动力工程

项目作者： 黄惠兰

作者单位： 广西大学

项目金额： 50万元

中文摘要： 针对太阳能烟囱发电技术的局限性，利用气液喷射技术构建太阳能→热力学能→势能→电能的转换方式，揭示各循环之间的能量流动机理，形成一种光热发电系统能源高效利用的重要方法，促进太阳能热利用技术的发展。 研究内容：1.建立设置有涂黑帆布的闭式集热棚（含蓄热层）的传热传质模型，研究具有集蓄热耦合的集热棚内能量转换的动态特性；2.构建低沸点工质气液喷射器有效的喷射性能方程，研究两相流混合机理、喷射压力、喷射系数、上升高度等关键技术，探索提高工质循环热效率的方法；3.建立发电系统的控制参数优化模型，确定各主要因素对整个系统发电效率的影响关系，将关键的影响参数进行合理匹配，阐明实现发电系统高效动力循环的最优控制策略。 创新点：1.采用气液相变来增大工质循环过程的密度差，提高了热力循环效率；2.在非聚焦普通集热方式下循环工质可获取较大输出压力，增大了系统功率，为太阳能热发电技术的大规模应用提出新的解决方案。

中文关键词： 气流两相流；能量转换；喷射器；太阳能发电；

英文摘要： Considering the limitation of the solar chimney power technology, a novel energy transfer mode is proposed, in which the solar energy is transformed from thermodynamic energy into potential energy and then into electricity by two-phase gas-liquid ejection technology. The mechanism of each energy transfer cycle is revealed. A promising way to utilize energy efficiently in the solar thermal power generation system is presented. The outcome from the study will promote the development of solar thermal technology. Research contents: the heat and mass transfer model of a closed collector with blackened canvas and storage layer will be set up. The dynamic characteristics of energy transfer in the collector combined energy collection-storage will be investigated. The effective equation with ejector performance in gas-liquid injection with low boiling point working fluid will be set up. The two-phase flow mixing mechanism and key technology about ejection pressure and coefficient and height of ascending will be studied. The technology to improve the circulating efficiency of working fluid will be explored. The optimization model of control parameters in the power generation system will be built. The influence of the main factors on the efficiency of overall power system will be determined. A reasonable matching of the

英文关键词： Two-phase flow；energy conversion；ejector；solar power generation；