作　　者： ; ; ; ;

机构地区： 华南理工大学化学与化工学院

出　　处： 《华南理工大学学报（自然科学版）》 2010年第8期40-44,共5页

摘　　要： 为高效节能地制备燃料乙醇,采用有效能分析法对燃料乙醇萃取蒸馏工艺的4个塔进行分析.其中醪塔由塔顶常压操作、水蒸气预热进料变为塔顶压力50 kPa、塔底废醪液预热进料后,有效能效率从33.3%增加到61.0%;精馏塔塔顶压力从常压变为200 kPa时,有效能效率从1.6%增加到64.0%;萃取精馏塔的萃取剂乙二醇中添加醋酸钾后,有效能效率从原来的25.0%增大到29.0%;萃取剂回收塔的有效能效率为25.9%.说明利用有效能分析法可以清晰地辨别系统能耗高的位置. In order to effectively produce fuel ethanol with low energy consumption, four columns of extractive distillation for fuel ethanol are analyzed by the exergy method. It is found that （ 1 ） the exergy efficiency of the prefractionator increases from 33.3% to 61.0% when the top pressure varies from 101. 325 kPa to 50 kPa and the feed is preheated by waste water in the bottom instead of by water vapor; （2） the exergy efficiency of the distillation column increases from 1.6% to 64. 0% when the top pressure improves from 101. 325kPa to 200kPa; （3） the exergy efficiency of the extractive distillation column increases from 25.0% to 29.0% after the addition of KAc in the extractant glycol; and （4） the exergy efficiency of the extractant recovery tower is up to 25.9%. All this demonstrates that exergy analysis is feasible in distinguishing the position of high energy consumption in an extractive distillation system.

关 键 词： 燃料乙醇 萃取精馏 有效能 有效能分析

领　　域： [化学工程]