Comprehensive Utilization And Organized Conversion Of Solar Energy Based On Photo-thermal Coupling Reaction

Solar energy,as the clean energy with the most abundant reserves,the widest distribution,and the greatest potential for growth,is the emphasis of many scholars’ researches.Solar energy utilization technology is mainly distinguished as photo-utilization technology based on quantum effect and thermal-utilization technology based on thermal effect.Dividing solar energy by wave band,and using corresponding conversion methods of different optical frequency is one of the key ideas to improve the overall utilization efficiency of solar energy.Our research group has proposed a photo-thermal coupling reaction that utilizes the full spectrum of solar energy to prepare solar fuel.From the perspective of solar energy organized conversion,this thesis proposes a comprehensive utilization of solar energy based on photo-thermal coupling reaction.In this paper,CO₂ reduction is used as photo-thermal coupling target reaction,and thermal oil as a heat transfer and storage working medium to perform system operation experiments.The experiment verifies the photo-thermal coupling reaction using radiation as the only energy source,and the feasibility of the system to achieve organized conversion of solar energy.The experimental results show that the CO output of the photo-thermal coupling reaction is 5.8 μmol / g-cat and is relatively stable.And the heat-collecting subsystem’s efficiency ηh is 59.7 %.Meanwhile,a preliminary analysis of the radiation in the reactor is carried out: when the material thickness is 4 μm,the radiant energy in the photo-thermal reactor accounts for25.79 % of the total energy,of which the ultraviolet-visible energy is used to drive the reaction while near-infrared bands are used to generate heat.The other energy,accounting for 63.45% of the total energy,is used to generate heat.This paper builds a dynamic heat transfer model for the core reactor composed of the photo-thermal reactor and heat collector,and uses Matlab software to calculate the effect of structural parameters and operating parameters on solar energy conversion performance.The results show that the thickness of the photo-thermal coupling material layer is a key structural parameter.And the thickness should be as thin as possible under the assurance of the reaction.For the operating parameters,the radiant energy should be sufficiently high in the system using thermal oil as the working medium.At the same time,the best thermal oil flow rate in this experiment is 0.5 m/s.Based on the experiment data and calculation results,this paper points out the direction of system optimization,and puts forward the idea of putting this system into practical application.