离心分离设备出料口堵塞对级联的影响研究

The Influence of Blocked Scoop of Centrifuge on Cascade

贫化^(64)Zn可有效降低核电站一回路中放射性强度。目前离心分离是制备贫化^(64)Zn的重要方法。在离心分离锌的过程中,级联易出现单机堵塞情况,进而影响级联稳定运行和产品丰度。针对实际级联运行过程出现的分离设备取料口堵塞变单股流的情况,建立不同流量、不同基本全分离系数的级联数学模型,基于推导的计算方程,模拟不同级出现不同数量机器堵塞的情况,并利用准线性化的方法进行求解。模拟算例的计算结果表明,分离设备取料口堵塞会降低级联稳定性,导致流量出现15%的波动,同时目标组分贫化丰度也由0.5004%波动至0.9315%。本研究结果有助于指导实际级联的设计与运行。

Depleted zinc-64 can effectively reduce the radioactivity in the primary circuit of nuclear power plant.At present,centrifugal separation is an important method to prepare depleted zinc-64.In the process of separation of zinc,the centrifuge is easy to be blocked in cascade,which will affect the stable operation and product abundance of the cascade.Considering the situation that the scoops of some centrifuges in cascade are blocked,a cascade mathematical model with different flow and different overall separation factor is established,which is solved by the quasi-linearization method.Based on the derived calculation equation,the different numbers of blocked scoops of centrifuges in different stages is simulated.The calculation results of the simulation example show that the blocked scoops of centrifuges will reduce stability of cascade,resulting in 15%fluctuation of the flow,and the dilution abundance of the target component also fluctuates from 0.5004%to 0.9315%.The conclusion is helpful to guide the actual cascade design and operation.