Performance Study Of The Solar Receiver/Reactor Based On Complementation Of The Concentrated Photovoltaic And Thermochemistry

The overuse of traditional fossil energy has led to the increasingly serious problems of environmental pollution and energy crisis,and solar energy has been widely concerned all over the world because of its reproducibility,pollution-free and extensive distribution.In recent years,photovoltaic-thermochemical comprehensive utilization,as a new way of solar energy utilization technology,has gradually become a research hotspot for scholars from all over the world.In this paper,the performance of solar receiver/reactor based on the concentrated photovoltaic-thermochemical complementation is studied as follows:Firstly,the theoretical model of the solar receiver/reactor is successfully established,and the energy transmission and conversion process of infrared spectral band energy transmitting through photovoltaic cells which is in the solar receiver/reactor is studied.This paper discusses the energy transmission process of infrared spectral band energy which transmits through transmittance photovoltaic cell,glass tube,the vacuum layer and the reaction tube of the solar receiver/reactor,and the whole energy conversion process of the transmitting infrared spectral band energy transferring into reaction heat and reaction mixed gas sensible heat required by the methanol decomposition reaction inside the reaction tube.The energy balance equation in the solar receiver/reactor is listed.Secondly,combining with the existing experimental data,the reliability of the established theoretical model of the solar receiver/reactor is verified,which lays a solid foundation for the subsequent theoretical analysis of the performance and key operating parameters of the solar receiver/reactor.Finally,combined with the established theoretical solar receiver/reactor model,the performance of the solar receiver/reactor under different transmitting infrared spectral bands is studied,including the distribution of superficial solar flux density of the reaction tube,the temperature field distribution of the reaction tube,the distribution of methanol conversion rate along the course and the conversion efficiency of infrared spectral energy to the chemical energy of solar fuel.The effects of key operating parameters such as direct solar radiation intensity,reactant inlet flow and reaction inlet temperature on the performance of the solar receiver/reactor are analyzed emphatically.The results show that with the increase of energy of the transmitting infrared spectral band,the gradual increase of direct solar radiation intensity,the decreasing of methanol inlet flow and the gradual increase of methanol inlet temperature,the superficial solar flux density of the reaction tube of the solar receiver/reactor increases gradually,the temperature of the reaction tube rises gradually,the conversion rate of methanol in methanol decomposition reaction in the reaction tube increases gradually,the conversion efficiency from transmitting infrared spectral band energy to chemical energy of the solar fuel increases gradually,and the conversion efficiency of from transmitting infrared spectral band energy to chemical energy of solar fuel generally change in the range of 53～60%.