摘要
在塔式太阳能热发电站中使用熔融盐作为换热工质,有利于提高电站整体运行效率,但高温下运行的吸热器易发生过热故障,对吸热器的结构与熔融盐都会造成破坏。为了找出过热发生的主要影响因素,利用计算流体力学数值模拟软件,对吸热器及换热工质各项参数进行温度的敏感性分析。分析结果表明,决定吸热器圆管及内部工质局部温度的变量主要有4个,分别为辐照能流极大值qmax、吸热器圆管壁厚δ、熔融盐工质的流速u与流体平均温度tf,并进一步分析了这4个变量对温度的影响趋势及各自原因。这一结论有助于吸热器运行时进行局部过热的预测。该文还提出了将其用于判断吸热器过热的方法。
The use of molten salt as heat transfer fluid in solar tower power plant（STPP） helps to improve the efficiency and boost the plant＇s performance as a whole.However,for the receiver work temperature is much higher,overheat easily happens which causes local excessive temperature as a consequence.This will lead to receiver structure damage as well as molten salt decomposition.In order to find out the main factors influencing overheat,this paper used a computational fluid dynamics（CFD） software to analyze temperature sensibilities of the receiver and molten salt fluid.Numerical experiments were done,and data was analyzed.Results show that four parameters affect local maximum temperature：the maximum heat flux density qmax,the thickness of the tube δ,the fluid velocity u,and the fluid average temperature tf.Their temperature influence trends are also given in the paper with explanations.At last,methods of utilizing these parameters to give a receiver overheat prediction were proposed.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第29期107-114,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(50906078)
国家863高技术基金项目(2006AA050103)~~
关键词
太阳能塔式电站
熔融盐吸热器
过热
非均匀热流
计算流体传热
solar tower power plant
molten salt receiver
overheat
non-uniform heat flux
computational fluid dynamics（CFD）
