安全壳过滤排放系统实验用气溶胶的确定及相关参数的选取

Determination of Experimental Aerosols for Filtered Containment Venting System and Selection of Technical Parameter

为了满足安全壳过滤排放系统的气溶胶过滤性能测试实验的要求,进行实验用气溶胶选取的方案研究。对安全壳内气溶胶实际特性进行计算评估,得出严重事故后安全壳内气溶胶的特性随时间的变化规律。综合考虑分析结果和国外的研究成果,确定实验用气溶胶为BaSO4、TiO2。实验用气溶胶的配送压力为0.1~0.65 MPa;主管道浓度为50~900 mg/m3,气溶胶质量中值直径为1μm,粒径分布的几何标准偏差为1~2。

In order to perform the aerosol removal efficiency tests of the containment filtered venting system, this paper focuses on the selection of the experimental aerosols for the research. Firstly, the characteristics of the aerosols in the containment are analyzed and the variation of the aerosol characteristics with time is calculated using several computational procedures. Then, on the basis of relevant research experiences of different countries and the special situation of this research, barium sulphate and titanium dioxide are finally selected as the experimental aerosols for this research with a mass median diameter of 1 micron, the system pressures of 1 to 6.5 bar, mass concentration of 50~900 mg/m3, geometric standard deviation of size distribution of 1-2.