芳烃抽提装置的节能优化  

Energy-Saving Optimization of Aromatics Extraction Unit

作　　者：赵勇[1] 张迪 王鹏[3] Zhao Yong(China Petrochemical Corporation,Beijing 100728)

机构地区：[1]中国石油化工股份有限公司,北京100728 [2]内蒙古工业大学能源与动力工程学院,呼和浩特010051 [3]中国石油天然气股份有限公司,呼和浩特010000

出　　处：《化工设计》2020年第5期22-25,1,共5页Chemical Engineering Design

摘　　要：苯、甲苯和二甲苯是生产各类化学品的重要原料,抽提精馏是广泛应用的芳烃生产工艺,但能耗较高,其节能优化至关重要。本文对某工厂芳烃抽提装置的精馏塔和换热网络节能优化进行研究,利用Aspen Plus软件对芳烃抽提装置进行模拟,基于夹点技术分析换热网络,并提出精馏塔的操作优化方案。能耗分析结果表明该装置换热网络的节能潜力较小,无需进行优化改造。根据模拟结果分别对苯塔和甲苯塔进行灵敏度分析,绘制曲线表示精馏塔各参数随回流量的变化关系,在保证产品质量和操作弹性的前提下根据该曲线优化两塔的回流量。优化结果表明苯塔的回流量可由71.5 t/h降低为55.9 t/h,甲苯塔的回流量可由63.08 t/h降低至53.4 t/h;该优化无需投资,每年可节省操作费用486.96万元。Benzene,toluene and xylene are important raw materials for the production of various chemicals.Extractive distillation is a widely used aromatics production process,but its energy consumption is high;its energy saving optimization is very important.This paper studies the energy-saving optimization of the distillation column and heat exchange network of an aromatics extraction unit in a plant,uses Aspen Plus software to simulate the aromatics extraction unit,analyzes the heat exchange network based on pinch technology,and proposes the operation optimization scheme of distillation column.The energy consumption analysis results show that the energy-saving potential of the heat exchange network of the unit is small,and no optimization modification is needed.According to the simulation results,the sensitivity analysis is performed on the benzene column and the toluene column.A curve is drawn to show the relationship between the parameters of the distillation column and the reflux flow.The reflux flow of the two columns is optimized based on the curve under the premise of ensuring product quality and operational flexibility.The optimization results show that the reflux flow of the benzene column can be reduced from 71.5 t/h to 55.9 t/h,and the reflux flow of the toluene column can be reduced from 63.08 t/h to 53.4 t/h;this optimization does not require investment and can save operating costs of RMB 4,869,600 Yuan per year.

关 键 词：芳烃抽提 精馏 换热网络 优化 

分 类 号：TQ241[化学工程—有机化工]