This article shows the modeling of a uranium dioxide production reactor using COMSOL Multiphysics software program in its 4.3b version. The model was made using 3 kinds of studies: momentum, heat and mass transport, i...This article shows the modeling of a uranium dioxide production reactor using COMSOL Multiphysics software program in its 4.3b version. The model was made using 3 kinds of studies: momentum, heat and mass transport, in order to determine the influence of the most important operational parameters: UO<sub>3</sub> reaction rate, composition and flow of the reduction gas, the initial temperature reactor and the reducing gas. The operational parameters evaluated were the followings: constant gas flow of2.5 L/min, initial hydrogen concentration of 0.25, 0.50 and0.75 M, and initial temperature of 400°C. The obtained results allow to conclude that under these working conditions, uranium dioxide is obtained virtually instantaneous and, with concentrations close to 0.5 M H<sub>2</sub> in the reducing gas, the process can operate continuously and autogenously, without applying additional energy and temperatures around 600°C.展开更多
The rational utilization of nuclear energy is crucial in current global energy system.Using a flame denitrificationreactor,this study develops uranium trioxide(UO_(3)),a critical intermediate product in the nuclear fu...The rational utilization of nuclear energy is crucial in current global energy system.Using a flame denitrificationreactor,this study develops uranium trioxide(UO_(3)),a critical intermediate product in the nuclear fuel cycle,and systematically characterizes its physicochemical properties.The UO_(3) products are comprehensively examined to assess their suitability for downstream nuclear industry applications.Our results indicates that high-quality UO_(3) products can be obtained using flamedenitrificationreactor at temperatures between 440℃ and 480℃.This study reveals the considerable potential of UO_(3) production via flamedenitrification,marking a significantadvancement towards enhanced nuclear fuel cycle systems.展开更多
文摘This article shows the modeling of a uranium dioxide production reactor using COMSOL Multiphysics software program in its 4.3b version. The model was made using 3 kinds of studies: momentum, heat and mass transport, in order to determine the influence of the most important operational parameters: UO<sub>3</sub> reaction rate, composition and flow of the reduction gas, the initial temperature reactor and the reducing gas. The operational parameters evaluated were the followings: constant gas flow of2.5 L/min, initial hydrogen concentration of 0.25, 0.50 and0.75 M, and initial temperature of 400°C. The obtained results allow to conclude that under these working conditions, uranium dioxide is obtained virtually instantaneous and, with concentrations close to 0.5 M H<sub>2</sub> in the reducing gas, the process can operate continuously and autogenously, without applying additional energy and temperatures around 600°C.
基金Xing Yuan Program of China National Nuclear Corporation(CNPE-8208)National Natural Science Foundation of China(22478056)for the financialsupport.
文摘The rational utilization of nuclear energy is crucial in current global energy system.Using a flame denitrificationreactor,this study develops uranium trioxide(UO_(3)),a critical intermediate product in the nuclear fuel cycle,and systematically characterizes its physicochemical properties.The UO_(3) products are comprehensively examined to assess their suitability for downstream nuclear industry applications.Our results indicates that high-quality UO_(3) products can be obtained using flamedenitrificationreactor at temperatures between 440℃ and 480℃.This study reveals the considerable potential of UO_(3) production via flamedenitrification,marking a significantadvancement towards enhanced nuclear fuel cycle systems.
