| The effective utilization of renewable energy has been one of the most important research area.Considering the renewable energy is in its infancy,it is feasible that the renewable energy and fossil fuels can be utilized complementarily.Based on the Natural Foundation of China,the researches are mainly on the integration mechanism of mid-temperature solar thermochemical power system,new methods of the conversion of solar energy to solar fuels under variable solar irradiance and the development of a 100 kW experiment platform.Based on the principle of synthetic cascade utilization of chemical energy and physical energy and the concept of energy level,we study the coupling regularities between different energy level in solar thermochemical processes under variable solar irradiance,the thermodynamic characteristics of three solar-driven reactions of methanol steam reforming,methanol decomposition and methane steam reforming have been disclosed.The coupling regularities between energy level of solar heat and reactions in the three solar thermochemical processes are also studied and the irreversibility characteristics are explored.Starting from the idea of energy level match between solar heat and endothermic reaction,we study a mid-temperature solar fuel process having synergetic dual thermochemical reactions,in which solar heat at around 300 ? provides heat to drive methanol steam reforming and decomposition successively with a variation in the solar irradiance.At solar irradiance below 400 W/m2,the low-grade solar heat is used to drive methanol steam reforming,at solar irradiance above 400 W/m21 the solar heat is combined with methanol decomposition.The solar thermochemical performances of the proposed solar fuel process were analyzed for typical days and a full year.Based on this new method,experiment platform has been developed and studied.The economic analysis of the mid-temperature solar driven methanol decomposition power system is also made. |
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