核电厂放射性废物重整流态化数值模拟研究

Numerical Simulation Research on Reforming Fluidization of Radioactive Waste in Nuclear Power Plant

核电厂排放的放射性废物高温重整过程中会以流化态的形式存在,为获取这个过程中的详细参数,设计出更优秀的运行条件,提出了一种新的核电厂放射性废物重整流态化数值模拟方法。该设计数值计算模型建立了气-固流体力学控制方程以及湍流模型;建立了核电厂放射性有机化学废物几何模型、对象几何模型,并划分网格结构,设置边界初始条件。通过数值计算研究不同高径比对颗粒的径向速度、径向固含率、径向气含率的影响。计算结果表明,高径比为1.0时,流化床中气-固颗粒的流化效果最好。

During the high-temperature reforming process,the radioactive organic nuclear waste discharged from the nuclear power plant will exist in a fluidized state.In order to obtain the detailed parameters of this process and design better operating conditions,a new numerical simulation method for reforming fluidization of radioactive waste in nuclear power plant is proposed.The numerical calculation model is designed,the governing equations of gas-solid hydrodynamics are established,and the turbulence model is established;The geometric model of radioactive organic chemical waste in nuclear power plant is established,the object geometric model is established,the grid structure is divided,and the initial boundary conditions are set.The effects of different height-diameter ratios on the radial velocity,radial solid holdup and radial gas holdup of particles are studied by numerical calculation.The calculation results show that when the height-diameter ratio is 1.0,the fluidization effect of gas-solid particles in the fluidized bed is the best.