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在2英寸脉冲筛板柱中,用扩散模型描述钍、铀低去污循环流程的传质过程。采用复合形法直接由浓度剖面同时确定轴向混合系数、传质系数等模型参数。由此获得的浓度剖面计算值与实验测定的浓度剖面比较符合。结果表明:Thorex过程脉冲筛板柱水相连续时两相轴向混合程度接近,有机相连续时分散相轴向混合小于连续相轴向混合。采用复合形法寻优,解决了以往方法中由于各种优化参数选择不当造成的计算结果与实际情况的偏差及程序容易溢出等问题。此算法简单,结果较可靠,收敛也比较快。
In a 2-inch pulsed sieve column, a diffusion model is used to characterize the mass transfer of thorium and uranium low decontamination cycles. The complex shape method is used to determine the model parameters such as axial mixing coefficient and mass transfer coefficient directly from the concentration profile. The calculated concentration profile obtained from this is in good agreement with the experimental concentration profile. The results show that when the aqueous phase of Thorex process pulse sieve plate column is continuous, the two-phase axial mixing degree is close to that of the continuous phase dispersive phase in the organic phase. The complex shape method is used to find the optimal solution, which solves the problems of deviation of the calculation result from the actual situation due to improper selection of various optimization parameters and the overflow of the program in the prior method. This algorithm is simple, the result is more reliable, the convergence is faster.