苯乙烯装置塔系热集成.pdf

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CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2015年第34卷第6期
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研究开发
苯乙烯装置塔系热集成
湛世辉,王彧斐,冯霄
(中国石油大学(北京)重质油国家重点实验笔,北京102249)
摘要:椨馏作为过程工业中最重要和最常用的分离手段,是耗能最大的单元操作。精馏塔一般从再沸器输入热
量,从冷凝器取走热量,利用某些塔高温位的冷凝热加热其他塔的再沸器,并将单塔节能技术与过程集成相结
合,实现塔系的热集成,可充分挖掘系统内部的节能潜力,达到减少公用工程消耗的目的。本文通过对某化工
厂的苯乙烯装置精馏塔系的分析,通过各个塔的温焓图之间的关系,提出了精馏塔系内部热集成的措施,包括
直接热集成、调压热集成和双效精馏与间接热集成耦合等3种方案。对于后两个热集成方策,采用 Aspen Plus
模拟改造后精镏塔的变化并验证了方淾的可行性。结果表明,苯乙媂装置采用该热集成措施能明显节省高品位
落汽的消耗,降低能量用。
关键词:精馏塔;热集成;苯乙烯
中图分类号:TQ021.8
文献标志码:A
文章编号:1000-6613(2015)06-1564-05
DOI:10.16085jis.1000-6613.2015.06.010
Heat integration of columns in styrene plant
ZHAN Shihui, WANG Yufei, FENG Xiao
State Key Laboratory of Heavy Oil Processing, China University of Petroleum(Beijing), Beiing 102249, China)
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
精馏系统作为过程系统的一个重要子系统,能法。其中,以基于知识的传统方法应用最为广泛。
耗高,约占整个系统能耗的三分之一,甚至更多リ。传统方法中常用的是7-H图,将塔的能量输入输出
精馏系统设计的优劣直接决定了整个过程的能耗水用四边形表示,根据经验对现有的精馏塔进行热集
平高低。因此,精馏过程的热集成具有重要的现实收稿日期:201404作改病日期:20101
意义,一直以来都是研究的热点
基金项目:国家重点基础研究发展计划项日(2012CB720500)。
塔系热集成的研究主要包括基于知识的传统方第一作者世解(9-):9男,顶土研究生,研究方向为化工系
法、数学规划方法及传统法与数学法相结合的方程、E, nail feng@cups?教投,主要研究方向为化工系统工
统工程。联系人:冯霄,博