Research On Thermochemical Properties Of ZnO Particles Decomposition Process In The Reactor Of Disc Solar System

In the condition that the exploitation and utilization of traditional fossil energy are faced with a series of problems,such as reduction of reserves and serious pollution,solar energy with the characteristics of common,harmless,huge,long wait for a characteristic,becomes an important new energy.Due to the low density of solar radiation energy irradiating the earth,radiation convergence is usually required in solar energy utilization.The common concentration systems are tower type,trough type and dish type.A highenergy beam that has been focused will perform light-thermal,light-electrical,or lightchemical conversion in some kind of device.Among them,solar thermal chemical hydrogen production process is driven by solar energy,and the high energy beams after convergence decompose metal oxides in the thermochemical reaction chamber to prepare for the subsequent hydrolysis of hydrogen.This article,based on Solar two-step hydrogen production with ZnO/Zn redox pair,simulates the light concentration and absorption,the thermochemical properties of the reaction chamber and the effects of parameters on the chemical reaction,by optical simulation software Trace Pro and fluid simulation software Fluent.First,based on Monte Carlo Method,the distribution of solar light at the focal plane and the distribution of radiation flux in the reaction chamber are simulated by optical simulation software Trace Pro.Except that,the effects of solar energy concentration radius,radiation characteristics of materials in the inner wall of the reaction chamber and the position relation between the focal plane and the inlet surface of the reaction chamber on the heat flow in the cavity are studied,and the distribution of radiation flux in the reaction chamber is obtained.Then,with radiation flux distribution as boundary conditions,the steady thermal characteristics of the situation coupled radiation,convection and heat conduction is studied by the fluid simulation software Fluent.Considering the change of surface emissivity of alumina ceramics with temperature,transient process of the heating process inside the reaction cavity is simulated.Finally,the temperature distribution in the reaction chamber with the participation of ZnO particles is obtained by coupling chemical reaction,and the influence of different operating parameters on the decomposition of ZnO is studied.Considering the change of ZnO particle absorption factor with temperature,the transient chemical reaction process in the cavity is simulated.This paper simulates the light concentration process,reaction chamber steady-state thermal characteristics of the transient and steady state transient chemical reaction process,and compares the various parameters on the solar focusing system,the influence of the reaction chamber performance trends,gathered for disc type solar system in the reaction chamber ZnO particles provides the theoretical analysis,the decomposition process for solar thermal chemical reaction cavity design and optimization provides a train of thought.