关键词: 精馏塔, 热集成, 苯乙烯

Abstract: Distillation is the most important and commonly used separation method in the process industry, and is the operation unit with maximal energy consumption. For a column, heat is generally supplied from a reboiler, and rejected from a condenser. Using the condensing heat of one column to heat another column’s reboiler, and combining energy saving measures of a single column with process integration, namely heat integration of columns, is an effective way to reduce utilities consumption. In this paper, by analyzing the distillation system in a styrene plant, with the relative position of T-H diagram for each column, three measures of heat integration schemes were proposed for the columns system, including direct heat integration, heat integration with pressure adjustment and coupling double-effect distillation with indirect integration. For the last two measures, Aspen Plus was used to simulate the operation changes and verify the feasibility of the schemes. The consumption of high quality steams and related cost could be significantly reduced.

Key words: column, heat integration, styrene