中文摘要：

以乙醇-水系统为研究物系，通过计算机稳态模拟计算，考察进料组成对三组不同结构的节能型双效精馏流程节能率的影响。研究结果表明：双效精馏流程A随进料中轻组分含量的增加，节能率均呈快速递增趋势，最高节能率均可达50％左右，2种流程均适合于进料中轻组分含量较高的体系分离。双效精馏流程B在进料组成0．2～0．4范围内，随进料组成的变化节能率变化很小，但在进料组成为0．5～0．6范围内，2种流程的节能率均有较大幅度增长，最高节能率分别达到34．29％和31．22％。双效精馏流程C在进料组成0．2-0．4范围内，2种流程的节能率受组成变化影响甚微，但在相同的进料组成下，双效精馏C-2的节能率高于双效精馏C-1，而在进料组成为0．5～0．6范围内，2种流程的节能率有很大的差别，双效精馏C—1节能率最低下降到6．2％，而双效精馏C-2节能率上升到24．89％。研究结果可为效精馏流程的选择提供理论依据。

英文摘要：

The effect of the feed composition on the energy-saving efficiency of double-effect distillation flow with three groups of different-structure was researched in ethanol-water system by process simulation. Research results showed that the energy-saving efficiency of the doub le-effeet distillation flow A rapidly increased with the increasing of feed composition, the highest energy-saving efficiency can reach approximately 50 %, both flows were suitable for the system separation of high light component content in the feed system. When the feed composition was 0.2 to 0.4, the energy-saving efficiency of the double-effect distillation flow B varied slightly with the change of feed composition. When the feed composition was 0.5 to 0.6, the energy-saving efficiency of both flows increased substantially, the highest energy-saving efficiency reached 34.29 % and 31.22 % respectively, when the feed composition was 0.2 to 0.4, theenergy-saving efficiency of the double-effect distillation flow C varied slightly with the change of feed composition, but in the same feed composition, the energy-saving efficiency of double-effect distillation flow C-2 was higher than the energy-saving efficiency of double-effect distillation flow C-1. when the feed composition was 0.5 to 0.6, the energy-saving efficiency of both flows had large difference, the energy-saving efficiency of double-effect distillation flow C-1 dropped to 6.2 %, while the energy-saving efficiency of double-effect distillation flow C-2 rosed to 24.89 %. The research results can provide a theoretical basis for the selection of the double-effect distillation flow.