Photo-thermal Decomposition Of Carbon Dioxide On Trough Collecting Platform

Energy is the cornerstone of the operation and development of human society.Currently,the depletion of fossil energy and environmental degradation are huge challenges for human society.Among the many new energy sources,only solar energy has huge potential.Scholars from various countries have turned their attention to various new technologies using solar energy,including solar photovoltaic power generation,solar thermal power generation,and solar photo catalysis.Since electric energy and the combustion of fossil fuels are both important components in the modern energy system,the utilization of solar energy should also consider new ways of matching and replacing the existing fossil energy system.Photo-thermochemical production of solar fuel is a new way to transfer and storage,which can overcome the solar characteristics of dispersion and intermittent.It mainly generates H₂,CO and other hydrocarbon fuels through solar decomposition of H₂O,CO₂,etc.At the same time,the cycle of carbon sources is completed without adding additional carbon sources.In theory,it achieves"zero"emissions to the environment.The research group put forward the idea of combining solar fuel production a nd trough heat collection system while conducting further research on photo-thermal synthesizing catalytic materials,and conducted preliminary exploration for the industrialization of solar fuel.A laboratory-scale photo-thermal synthesizing trough reaction platform was built,and experiments were performed using a photo-thermal synthesizing tubular reactor made of commercially available P25 and Cu-supported TiO₂ as catalytic reaction materials to decompose CO₂ and generate CO.The average CO cycle product ion is 1.54?mol?h^-1 and7.63?mol?h^-1,and the yield is stable.Although the average yield is low compared to special material experiments,it also proves the feasibility of this photo-thermal synergistic reaction platform.Calculating the energy of the heat collecting part of the system fuel production,the energy utilization efficiency of the heat collecting subsystem is?_h=56.79%,which shows that the heat collecting reactor has a good response to the light energy projected on the surface of the inner tube.The heat transfer model established by the system is analyzed,and the various heat losses of the reactor are analyzed and calculated,and the theoretical thermal power of the thermal oil is obtained through energy conservation.The theoretical thermal power and thermal efficiency of the heat collection subsystem can be obtained by heat transfer calculation according to the temperature of the pipe wall,the physical properties of the heat transfer oil,and the working conditions.The reasons for the lo w energy utilization efficiency of the system through comparative analysis are mainly the poor concentration of the optical path and the loss of energy.There are also heat losses in the pipe joints,partially exposed metal hoses and other parts of the oil circuit,the non-vacuum reaction chamber causes a higher wall temperature,which increases the convective heat transfer between the environment and the glass tube,there is a loss in the photo-thermal conversion process caused by photo-thermal response material,and the presence of gas also has an adverse impact on the effect of the photo-thermal response material.Finally,we put forward feasibility suggestions for the future improvement of the system based on the above analysis.