中文摘要：

以八达岭塔式太阳能热发电实验电站蒸汽蓄热器为研究对象,根据蒸汽蓄热器的结构和工作机制,建立蒸汽蓄热器的全工况动态仿真数学模型。该模型以汽液两相分界面为界,分别建立汽相区和液相区动态能量和质量守恒方程式,引入动态汽化量和蒸汽凝结量,实现汽、液相区之间能质传递。在此基础上,利用STAR-90仿真平台模拟八达岭塔式太阳能热发电站蓄热器的充热和放热过程,进行充、放热蒸汽流量阶跃扰动实验。仿真实验表明：蒸汽蓄热器在充热过程和放热过程具有不同的压力变化特性;放热过程中,蒸汽流量增加对蒸汽温度影响幅度较大,容易导致汽轮机入口蒸汽过热度偏低。该结论对具有蓄热系统太阳能热发电电站运行策略的制定具有一定的指导意义。

英文摘要：

A whole working condition mathematical model for the steam accumulator in Badaling solar power tower plant was developed.According to the structure and working mechanism of the steam accumulator,the dynamic energy and mass conservation equations in both the vapor region and the liquid region were established.Dynamic mass and energy transport between the vapor region and the liquid region was considered by introducing the vaporization and condensation through the vapor-liquid interface.Based on STAR-90 simulation platform,the charging and discharging processes of the steam accumulator were simulated,and the step disturbance of steam flow during the charging and discharging processes was numerically investigated.The results show that the characteristics of pressure variation in the steam accumulator in the charging process are different from that in the discharging process.In the discharging process,the steam temperature can be evidently influenced when increasing the steam flow rate,easily causing a low superheat steam at the turbine inlet.The findings in this paper provide valuable insights into the design and control strategy of solar thermal power plants with thermal storage systems.