高温堆停堆落球装置吸收球下落特性分析

Analysis of Falling Characteristics of Small Absorber Ball in HTR Shutdown Device

对高温气冷堆停堆落球装置中的吸收球下落特性进行研究。采用与实际吸收球等直径(φ6 mm)的玻璃球,以及与实际堆芯吸收球下落孔道等内径(φ60 mm)的有机玻璃管落球装置,进行空气环境中玻璃球的重力下落试验。孔口颗粒重力下落质量流率的经验公式Beverloo公式与本次试验结果符合较好,偏差在4%～12%。实测玻璃球在有机玻璃贮球罐中的安息角约为23。试验结果表明:就目前所设计的带有锥形漏斗的贮球罐,对应于中心孔口垂直上方的玻璃球首先开始流动,然后周围的颗粒不断向孔口中心补充,玻璃球面逐渐下降,玻璃球在贮球罐内下落顺畅。

The falling process of small absorber ball in the drop-ball device of HTR absorber ball shutdown system has been studied in this paper.Glass ball with the identical dimension of the actual absorber ball diameter （φ6 mm）,and drop-ball device made of plexiglass tube with the identical inside diameter （φ60 mm）of the actual absorber ball falling canal in the core have been applied.Experiments of glass ball falling due to gravity in the air environment have been accomplished.The calculation results coming from Beverloo empirical formula,which has been used to calculate mass flow rate of particle at orifice owing to gravity,agrees well with experimental results in this research with the deviation of 4％ to 12％.The angle of repose of the measured glass ball in a ball storage vessels made of plexiglass is about 23°.Experimental results showed that glass ball in the vertically above center orifice firstly begin to flow,and then the circumambient particles supply to the orifice center in the ball storage vessels designed with the cone angle of the funnel.Glass balls gradually decline freely and smoothly from ball storage vessels.