内部热耦合-上置隔壁塔的设计与优化

Design and optimization of internal thermal coupling-top dividing wall column

为了提高化工分离过程的节能效果、扩展内部热耦合精馏塔以及隔壁塔的运用,提出了内部热耦合-上置隔壁塔(ITC-TDWC)的新结构。以甲醇-乙醇-正丙醇三元混合物系作为研究对象,选用进料比例为0.5、0.25、0.25,以上置隔壁塔(TDWC)的结构为基础并结合发展内部热耦合(ITC)来设计ITC-TDWC的最优化结构。在最终确定ITC-TDWC的最优结构后,将该结构的回收年限、能耗等数据与TDWC进行了对比分析,结果表明,ITC-TDWC在达到三元混合物分离要求的同时,回收年限会略有增加,但节能效果显著,比TDWC的分离过程节能约30%。

In order to improve the energy-saving effect of chemical separation process,and gradually expand the application of internal thermal coupling distillation column and dividing wall column,a new structure of internal thermal coupling-top dividing wall column(ITC-TDWC)is proposed,which is based on the structure of top dividing wall column and combined with the development of internal thermal coupling.Taking methanol-ethanol-N-propanol ternary mixture system as research object,the optimal structure of ITC-TDWC is designed with feeding ratios of 0.5,0.25 and 0.25,respectively.After the optimal structure of ITC-TDWC is finally determined,the payback period and energy consumption of the structure are compared with that of TDWC.Comparation results show that the payback period of ITC-TDWC will increase slightly while meeting the requirements of ternary mixture separation,but the energy saving effect will be significant,which will save about 30%of energy than TDWC separation process.