Synergy Experimental Study On Photo-Thermal Reaction And Heat Collection Based On Trough Concentrator

As the contradiction between the increasing demand for energy and the depletion of fossil energy is becoming more and more tensed,it’s urgent to accelerate the pace of energy structure transformation and realize the sustainable development of energy resources.Among the various types of renewable energy sources,solar energy has attracted widespread attention from scholars at home and abroad because of its wide-ranging sources and non-polluting products.At present,solar energy utilization technologies mainly include light utilization technologies represented by photovoltaic power generation and photocatalysis,and thermal utilization technologies represented by thermal power generation and thermochemical cycles.It’s crucial to improve solar energy utilization efficiency through making use of solar energy in sub-bands and the integrating different technologies into the same system to achieve the effect of comprehensive utilization of solar energy by classification and quality.The photo-thermal synergistic preparation of solar fuel technology in this study is a new technology that comprehensively utilizes full-spectrum solar energy to prepare carbon monoxide,hydrogen and other hydrocarbon fuels using carbon dioxide or water as raw materials.Currently,the parabolic trough solar thermal power generation system is one of the thermal power generation systems with the most developmental potential.The temperature range of the photothermal synergistic reaction is consistent with the temperature of the existing solar thermal power generation technology.According to the study on the comprehensive utilization of photothermal,this paper studies on both photothermal synergistic reaction and heat collection.Preliminary explorations have been made for the industrial application of solar full-spectrum utilization technology.The study designed a solar-photothermal synergistic reaction and heat collection integrated reactor and built a corresponding experimental system.The target reaction of the experiment was to produce hydrogen through water splitting,while using heat transfer oil as the heat storage and exchange working medium.The results showed that in the photothermal synergistic reaction with a material surface temperature of 414℃,the average output of reactive hydrogen using commercial P25 as the catalytic material was 1.44μmol/g,and the average output of reactive hydrogen using Fe-doped TiO₂ as the catalytic material was 15.65μmol/g,and the output of the two reactions remained relatively stable in five sets of repeated experiments.The results proved the possibility of solar fuel production in an integrated system.At the same time,the heat-collecting part energy of the system was calculated using the heating effect of the heat transfer oil.The results showed that the energy utilization rate of the heat-collecting system could reach 43.61%,which proved that the integrated system could use the remaining solar energy after fuel production.Combining the experimental results above,the effect of the experimental system on the hierarchical and qualitative utilization of the full-spectrum solar energy was verified through the calculation and analysis of the energy flow of the integrated system.To further optimize the performance and improve the energy utilization efficiency,a heat transfer model of the core reactor was constructed,and Matlab was used to calculate the influence of changes in structural parameters and operating conditions on the experimental results of the reactor.The results showed that under the premise of ensuring the effect of the photothermal synergistic reaction,the thickness of the catalytic material was appropriately reduced;under the premise of ensuring the normal operation of the heat transfer oil,the appropriate selection of a lower flow rate and an appropriate increase of the radiation energy entering the system could effectively improve the system Energy efficiency.Finally,the study combined the experimental results and simulation calculation results and proposed an optimization and improvement plan for the integrated system,providing theoretical support for the industrial application of the system.