基于能量流的塔式太阳能热发电吸热器动态建模

塔式太阳能热发电空气吸热器的最大热应力与其温度变化率成正比,吸热器出口空气温度的动态特性影响塔式光热系统的功率特性。结合热电比拟理论,采用对流换热系数和Rosseland辐射传递方程描述传热过程,建立塔式太阳能热发电系统中碳化硅泡沫陶瓷吸热体的能量流模型。通过剖析空气吸热器工作过程的传热特性,得出平均能流密度、吸热体厚度、平均孔径对出口空气温度、吸热体温度的影响,为该类空气吸热器的设计提供了理论依据。

DYNAMIC MODELING OF SOLAR TOWER RECEIVER BASED ON ENERGY FLOW

Maximum thermal stress of air receiver for solar tower is proportional to its temperature varying ratio, and air outlet temperature dynamic characteristic relates to power characteristic of the solar tower power generation system. Based on assimilate heat and electricity theory, the energy flow model of silicon carbide foam ceramic absorber in tower solar power generation system is established by using heat transfer coefficient between air flow and ceramic foam and Rosseland radiation model to describe the heat transfer process in which the properties of air are considered variable with temperature. By comparing the simulation results, the heat transfer between air flow in which and ceramic foam was studied, and the influences of the average energy flow density, the thickness of the air receiver and the average cell size on the outlet air temperature and the temperature of the heat absorber are analyzed, which provides a theoretical basis for the design of this kind of air receiv.