Abstract: Internal thermally coupled distillation column(ITCDIC)is the most promising distillation energy-saving technology.It can save more than 40% energy compared with traditional distillation process,but so far it has not been widely used.The application of the ITCDIC technology in air separation column can bring a good energy saving effect.Based on the characteristic of cryogenic air separation process as well as three-component distillation,a new optimization model of internal thermally coupled air separation columns(ITCASC)is presented.Analysis of energy consumption is carried out detailed.Compared with the conventional air separation columns(CASC),compressor energy consumption decreases by 20.75%,the product value increases by 17.46% and energy consumption per unit of output decreases by 32.53%.The extraction rate and energy consumption of ITCASC are superior to conventional air separation columns.

Key words: internal thermally coupled, air separation, modeling, optimization

摘要： 内部热耦合精馏是迄今为止所提出的节能效果最好,而唯一没有商业化的节能技术。将内部热耦合技术用于空分塔,可以带来良好的节能效果。根据低温空气分离过程以及三组分精馏的特点,提出了一种新的内部热耦合空分精馏塔优化模型。在优化模型基础上,对热耦合塔进行了深入的节能优化与分析,并且与常规空分仿真结果进行了比较分析,压缩机能耗下降20.75%,产值增加17.46%,单位产值能耗下降32.53%。内部热耦合空分塔的提取率以及能耗均优于常规热耦合空分塔,节能效果显著。

关键词: 内部热耦合, 空气分离, 建模, 优化