萃取过程稳态计算中影响计算结果准确度的因素

FACTORS AFFECTING ACCURACY IN THE CALCULATION OF STEADY-STATE CONCENTRATION PROFILES IN PUREX PROCESS

摘要: <正> 一、前言迄今,在已开发的各种计算萃取器浓度分布的模型中,最有代表性的是PUMA模型和SEPHIS模型。本文采用的MPUMA(Modified PUMA)模型是在PUMA模型和SEPHIS模型的基础上,探讨了进一步提高计算精度的途径。主要的改进有两点:1)为了消除萃取传质过程两相体积变化对计算精度的影响,在各种组分的平衡计算中,用重量摩尔浓度(mol/kg)代替体积摩尔浓度(mol/l);2)降低运算过程的迭代误差。上述计算以Purex流程的1A萃取器为对象,在IBM-PC微机上,利用自编的FORTRAN语言程序来进行,并将其运算结果与按PUMA模型和SEPHIS模型计算结果以及实验测定值作了比较。

Abstract: This paper describes the mathematical basis of a computer model MPUMA (Modified Plutonium-Uranium-Matrix-Algorithm) . The model simulates the steady-state concentration profiles of solvent extraction contactors used in purex process, directly without giving consideration to the transient behavior. Because the change of volume of organic and aqueous phases during mass transfer is corrected and iterative error is selected reasonably, the computational accuracy of MPUMA model is higher than that of SEPHIS and PUMA models developed previously for simulating the steady-state at transient conditions.