The Distribution Characteristics And Optimization Of The Energy Flow Of The Mirror Field In The Tower Solar Thermal Power Station

With the rapid development of industrialization,solar energy,as a renewable and clean energy,has got global attention and study.Solar tower power system has deep prospects for development,for its high efficiency and excellent economic benefits when running in large scales.In this paper,the sun moving trajectory above the heliostats field,together with the working time and energy collecting efficiency of heliostats field is studied.On that basis,the arrangement of heliostats field is obtained and the energy collecting efficiency is guaranteed.At the same time,the energy distribution on the surface of the receiver is optimized.When cloud shading occurs,the safe operation of the solar power tower is ensured too.Firstly,the location of solar power tower is selected and the sun moving trajectory is analyzed.By analyzing the solar energy distribution on the surface of ground,the solar power tower is built where solar energy is rich and the rain and clouds are relatively little.Secondly,the arrangement of heliostats field for certain scale of power generation is designed.After the designing principle of heliostats field is studied and the distances between heliostats is chosen,the energy model of heliostats field is established and the energy distribution of heliostats field on two equinox days and solstice days is got.After that energy model of the total power generation efficiency of the solar power tower is established.On that basis,the heliostats field arrangement is got,where the energy efficiency is ensured.This chapter lays a foundation for the follow-up studies of the energy distribution on the surface of the receiver.Thirdly,the energy distribution on the surface of the receiver is optimized and the safe and high-efficiency operation of the receiver is guaranteed.After choosing the appropriate type of receiver and heat transfer medium,the model of energy spot which is reflected to the receiver by the heliostats is established and the energy overflow on surface on the receiver is taken into consideration.To analyze the energy distribution on surface of the receiver under different reflecting aiming point strategy,the double goals judging principle is built.By modeling and optimizing,the best energy distribution scheme is obtained.Finally,the effect of clouds shading and movement on the energy distribution on surface of the receiver is analyzed.By building the cloud shading model and moving model,the energy changing on the surface of receiver is analyzed.On that basis,certain actions such as stopping running the plant is taken for the high solar-heat energy transfer efficiency of the receiver and the total energy generating efficiency of the solar power tower.