Study On Modeling Method Of Energy Flux Density Of Concentrating Solar Power Tower System

With the reduction of fossil energy and people's awareness of environmental protection,new energy has been vigorously developed.Solar power tower system has become an important development direction of current new energy.Among them,solar power tower station has attracted a lot of attention because of its high power generation efficiency.The key to power generation efficiency in tower solar heliostat field is the energy received on the surface of the receiver Therefore,the study on the energy flow distribution on the surface of the receiver plays an important role in improving the efficiency of the heliostat field.After understanding the status of concentrating solar power tower system at home and abroad,the research method of the surface energy flow distribution of the receiver was specifically introduced,and the following research was conducted:(1)Based on the analysis of the solar movement rule,the tracking control strategy model of the heliostat is established according to the need of the solar power tower system.(2)A physical model of the heliostat field was established to simulate the reflection patterns of the single heliostat at different positions in the heliostat field at different times of the day on the surface of the receiver with different shapes.The spot imaging on the surface of the receiver is simulated when the helioscope is composed of multiple heliostats.(3)Introduced the shape of the sun and the cause of solar divergence.The imaging spot and energy flux distribution model of the heliostat on the surface of the receiver are established based on the fact that the sun ray is not parallel.(4)According to the structure characteristics of the three-layer field network of the large heliostat field,an improved algorithm for the surface spot imaging of the receiver is designed,which can effectively simplify the calculation of the flux density distribution of the large heliostat field.According to the calculation results,the aiming control strategy of heliostat is modified to improve the power generation efficiency.The simulation results show that the concentration control of the tower solar heliostat proposed in this paper meets the field requirements,and the modeling method of energy flux density of the heliostat group can provide theoretical basis for the subsequent concentration strategy.It has promoted the development of China's solar power tower technology.