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建立了板式间歇精馏塔在恒馏出液组成操作状况下常规设计及优化设计的数学模型。常规设计模型用数值方法编程求解,对二元理想及非理想溶液均适用。优化设计模型以间歇精馏系统年效益最大为优化目标,用菲波那契法求解单变量优化问题,用复合形法求解多变量优化问题。模型同时考虑对整个间歇精馏系统(包括塔主体、塔顶冷凝器及塔底再沸器)进行优化,更符合工程实际情况。求解模型可得到间歇精馏过程最优的一系列设计和操作参数(如理论板数,塔径,操作回流比,塔釜蒸发量,釜残液组成,冷凝器传热面积及冷却水出口温度,再沸器传热面积及加热蒸汽温度等)。算例表明,对恒馏出液组成间歇精馏单变量及多变量优化设计比常规设计分别提高年效益2.6%和18.9%。
The mathematical model of conventional design and optimal design of plate batch distillation column under the operating condition of constant distillate is established. Conventional design models are solved numerically and are suitable for both binary and non-ideal solutions. The optimization design model is based on the optimization of annual efficiency of batch distillation system. The Fibonacci method is used to solve the univariate optimization problem and the complex method is used to solve the multivariable optimization problem. The model also considers optimizing the whole batch distillation system (including the main tower, the top condenser and the bottom reboiler), which is more in line with the actual situation of the project. The model can be obtained by optimizing the batch distillation process a series of design and operating parameters (such as the number of plates, the tower diameter, the operating reflux ratio, the bottom of the reactor evaporation, reactor residue composition, the condenser heat transfer area and cooling water outlet temperature , Reboiler heat transfer area and heating steam temperature, etc.). The experimental results show that the single-variable and multivariable optimization of batch distillation of constant-distillate liquid increases the annual benefit by 2.6% and 18.9% respectively compared with the conventional design.