【作者】 应振根； 曾实； 姜东君； 周明胜；

【Author】 YING Zhen-gen,ZENG Shi,JIANG Dong-jun,ZHOU Ming-sheng (Department of Engineering Physics,Tsinghua University,Beijing 100084,China)

【机构】 清华大学工程物理系；

【摘要】 脉冲级联是一种非常规级联,它利用离心机的分离系数随供料流量减小而增大的特点,通过连通、封闭两个环节交替运行,能用较少的级数得到很高的目标同位素丰度。采用结合了Q迭代的时间推进方法来计算脉冲级联的运行过程,并通过对不同的回流流量、基本全分离因子、级联长度、同位素混合物等多种情况的计算分析,有以下结论:封闭运行环节的回流流量只影响这个环节的时间,并不影响级联达到稳态的过程;脉冲级联达到稳态的过程随着各级基本全分离因子的增大而变缓,所需的脉冲数也随之增加;级数越多,脉冲级联达到稳态时所需的脉冲数就越多;在相同的级联长度和外部参数的条件下,脉冲级联能得到比常规级联更高的目标同位素丰度,并且其单位质量供料对应的价值增量大得多。更多还原

【Abstract】 Pulse cascade is a new concept of non-conventional cascades,the basic idea of which is to make use of the property of centrifuges that the overall separation factor increases with the decrease of the feed.A time-marching method combined with the Q-iteration is utilized to compute the operation process of pulse cascades,and after calculation and analyses for different cases of different recirculating flow rates,overall separation factors,cascade lengths,and isotopic mixtures,following conclusions are drawn:The recirculating flow rates in the closed state affect the duration time of this state,but has no influence on the process of reaching the steady state.If the overall separation factor of every stage increases, the process of reaching the steady state becomes slow,and the final pulse number increases.The longer the cascade is,the larger the final pulse number is.Compared with a conventional cascade,the pulse cascades can obtain target components with higher concentrations under the same condition of cascade lengths and external parameters,the value increment per unit mass of feed obtained by the pulse cascade is much larger than that of the convention cascade.更多还原