华南理工大学学报(自然科学版) ›› 2010, Vol. 38 ›› Issue (8): 40-44.doi: 10.3969/j.issn.1000-565X.2010.08.008

• 化学化工 • 上一篇    下一篇

燃料乙醇萃取蒸馏工艺的有效能分析

杨慧 陈砺 严宗诚 王红林   

  1. 华南理工大学 化学与化工学院, 广东 广州 510640
  • 收稿日期:2009-09-03 修回日期:2009-12-04 出版日期:2010-08-25 发布日期:2010-08-25
  • 通信作者: 杨慧(1984-),女,博士生,主要从事可再生资源理论与应用研究. E-mail:yanghui198410@yahoo.cn
  • 作者简介:杨慧(1984-),女,博士生,主要从事可再生资源理论与应用研究.
  • 基金资助:

    广东省科技计划项目(2002C20809,2004850101001,2006A50102002);科技部中泰科技合作项目(18-509J)

Exergy Analysis of Extractive Distillation for Fuel Ethanol

Yang Hui  Chen Li  Yan Zong-cheng  Wang Hong-lin   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-09-03 Revised:2009-12-04 Online:2010-08-25 Published:2010-08-25
  • Contact: 杨慧(1984-),女,博士生,主要从事可再生资源理论与应用研究. E-mail:yanghui198410@yahoo.cn
  • About author:杨慧(1984-),女,博士生,主要从事可再生资源理论与应用研究.
  • Supported by:

    广东省科技计划项目(2002C20809,2004850101001,2006A50102002);科技部中泰科技合作项目(18-509J)

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50kPa、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200kPa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.

关键词: 燃料乙醇, 萃取精馏, 有效能, 有效能分析

Abstract:

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.

Key words: fuel ethanol, extractive distillation, exergy, exergy analysis