有固相析出的多效两段蒸发系统模型与过程模拟  

The model and process simulation of multi-effect two stage evaporation system with solid separation

作　　者：李玲[1] 阮奇[1] 

机构地区：[1]福州大学化学化工学院,福州350002

出　　处：《中国工程科学》2008年第10期54-60,共7页Strategic Study of CAE

基　　金：福建省教育厅科技基金资助项目(JB07002)

摘　　要：建立了带有冷凝水闪蒸的有固相析出的多效两段蒸发系统的常规设计数学模型,模型将系统的相平衡关系用回归式表达,使模型可以用计算机编程求解,避免了手工计算结合查相图的烦琐的计算过程;利用矩阵方程具有结构清晰和高度模块化的特点,将系统的物料衡算和热量衡算方程组写成矩阵方程的形式,只要保留或舍弃矩阵方程中的相关块矩阵,模型就能代表没有冷凝水闪蒸或没有固相析出的多效两段蒸发系统常规设计模型;采用迭代法结合矩阵法来求解模型,算例表明,冷凝水闪蒸对多效两段蒸发系统是有效的节能措施,算法收敛速度快、收敛稳定性好。A mathematical model of conventional design for the multi-effect two stage evaporation system with condensed water flash and solid separation was established. The equilibrium was correlated to equation and the model could be solved with computer easily. Then the complex manual calculating was avoided. Mass balance and energy balance equations of the system were expressed in matrix equation that has the advantage of clear structure and high modularization. By holding or omitting correlative block-smatrix in matrix equation, matrix equation could be used to describe the multi-effect two stage evaporation system without condensed water flash or solid separation. The model was solved by combining matrix method with iteration method. The practical example indicated that condensed water flash is an effective method to save energy. And the algorithm increases the convergence speed and stability.

关 键 词：固相析出 多效两段蒸发数学模型 冷凝水闪蒸 

分 类 号：TQ018[化学工程]