分壁精馏塔分离五元体系的稳态及动态研究  

Steady state behavior and dynamic control of five-product divided-wall columns for alcohol separation

作　　者：华涛 邱洁 何桂春 伍祥 凌昊[1] Hua Tao , Qiu Jie , He Guichun, Wu Xiang, Ling Hao(State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, Chin)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《石油化工》2018年第8期827-834,共8页Petrochemical Technology

基　　金：国家自然科学基金项目(21476081);上海市教育委员会科研创新重点项目(14ZZ058)

摘　　要：分壁精馏塔(DWC)可在一个塔内实现多元混合物的高效分离,以甲醇、乙醇、正丙醇、正丁醇和正戊醇五元体系为研究对象,考察了由一个常规塔和Kaibel分壁精馏塔组合(CKDWC)和强化的分壁精馏塔(EDWC)的分离规律。建立并优化了CKDWC和EDWC的严格稳态精馏模型,在Aspen Dynamic环境下考察了组分控制结构在应对进料流量和组成发生±10%波动时的控制效果。稳态研究结果表明,DWC在应用于五元混合物的分离过程中具有节能优势,EDWC可在一个塔内对五组分体系进行高纯度分离,与常规分离序列相比可节省再沸器负荷38.6%,与CKDWC相比可节省再沸器负荷20.9%;EDWC在预分馏段实现丙醇和丁醇的清晰分割,在中间段实现甲醇和丙醇的清晰分割。动态研究结果表明,组分控制策略在应对进料流量及组成发生±10%的波动时具有良好的控制效果。Divided-wall column（DWC） can realize efficient separation of a multi-component mixture in one single column.The separation of a five-component mixture of methanol,ethanol,n-propanol,n-butanol and n-pentanol was studied in CKDWC（conventional column and Kaibel DWC） and EDWC（extended DWC）,respectively.The optimum economic design of CKDWC and EDWC was obtained.A composition control model with ±10% disturbances of flow rate and feed composition in EDWC was set up under the Aspen Dynamic.The results showed that DWC had some advantages of energy when compared with the conventional separation configuration.The EDWC could separate the fivecomponent mixture in one single column,which could reduce the reboiler duty by 38.6% as compared to the conventional separation sequence and 20.9% when compared with CKDWC.In the EDWC,the split of propanol and butanol was carried out in the prefractionator,and methanol and propanol were split in the middle column.The dynamic simulation results showed that the composition control model could handle ±10% disturbances of flow rate and feed composition.

关 键 词：分壁精馏塔 五元体系 稳态 动态控制 模拟 

分 类 号：TQ202[化学工程—有机化工]