太阳能直接蒸汽热发电系统的多级耦合分析与系统集成研究

Direct steam generation (DSG) is a highly competitive candidate for next-generation concentrated solar power (CSP) technology. However, there exists unsolved bending and vibration issues of receiver due to low controllability of vapor-liquid two-phase flow, which could influence the secure, high-efficient and stable system running. These issues show significant component-unit-loop-system multi-level characteristics. The proposed project aims to solve these issues by carrying out multi-level coupling analysis and system integration study of DSG-CSP system. Based on the multi-level coupling model, detailed analyses of the mechanism of bending and vibration of receiver and the interaction of physical quantities between different levels are to be carried out. Control mechanisms at different levels are to be proposed, namely component-level control mechanism of re-construction of the vapor-liquid profile inside receiver by customization of surface wettability, unit-level control mechanism of stability of the vapor-liquid pattern inside receiver by active deviation angle, and loop-level control mechanism of manipulation of the vapor-liquid pattern distribution inside loop by steam mass quality at vapor-liquid separator. By combining the multi-level composite control mechanisms and the operation strategy of DSG-CSP system, the system integration principle and the real-weather-condition multi-level composite control method for DSG-CSP system are to be proposed eventually. The proposed project is expected to offer theoretical guidance for secure, high-efficient and stable running of DSG-CSP system.

太阳能直接蒸汽（DSG）热发电技术是极具竞争力的下一代聚光太阳能热发电技术，但目前系统的安全高效稳定运行受到由于气-液两相流动可控性低带来的影响问题亟待解决。该问题具有显著的部件-单元-回路-系统多级耦合特征。本项目拟开展针对DSG热发电系统的多级耦合分析与系统集成研究。通过多级耦合模型对气-液两相流动特性变化机理和物理量跨级影响机制进行深入剖析，有针对性地提出多级复合调控机制，包括通过调节集热管壁润湿性条件对管内气-液分布实现重构的部件级调控机制，通过调节集热器主动偏转角进而提高管内气-液流型稳定性的单元级调控机制，通过调节回路分离点干度控制管内气-液流型沿程分布的回路级调控机制。将多级复合调控机制与DSG热发电系统固有运行调控规律进行集成，最终提出适用于真实气象条件下的系统集成原则及复合调控方法。本项目研究成果将为DSG热发电系统的安全高效稳定运行提供理论指导。

太阳能直接蒸汽（DSG）热发电技术是极具竞争力的下一代聚光太阳能热发电技术，但由于气-液两相流动可控性低，使其安全高效稳定运行受到极大影响，且该问题具有显著的部件-单元-回路-系统多级耦合特征。本项目针对DSG热发电系统开展了多级耦合分析与系统集成研究，通过建立多级多物理场耦合模型对气-液两相流动特性变化机理和物理量跨级影响机制进行深入剖析，有针对性地提出了复合调控机制并进行了验证，包括通过调节集热管结构、管壁润湿性条件等对管内气-液分布实现重构的部件级调控机制，通过调节集热器主动偏转角进而提高管内气-液流型稳定性的单元级调控机制，通过调节回路分离点干度控制管内气-液流型沿程分布的回路级调控机制。将复合调控机制与DSG热发电系统固有运行调控规律进行集成，最终提出适用于真实气象条件下的系统集成原则及复合调控方法。本项目相关研究成果发表SCI论文18篇，EI论文1篇，国际会议论文4篇，国内会议论文2篇，项目负责人受邀作特邀报告1次，完成Elsevier出版社专著1章；授权发明专利10项；获中国热发电大会优秀论文奖；培养博士研究生2名，硕士研究生4名，引进（外籍）博士后1名。本项目研究成果将为DSG热发电系统的安全高效稳定运行提供理论指导。