Abstract: Ethylene production as an important basic industry plays an important role in national economy,petrochemical industry and industrial society,and maintains a booming trend in economic growth. But because of the overall technical level of ethylene production in China as well as complex raw material supply and other factors,China's current ethylene plant lags behind world's advanced level. In order to catch up with world advanced level,process automation and real-time optimization is essential. This paper describes real-time optimization development status and application of this technology in ethylene plant. Through implementation of real-time optimization system and establishment of a whole process mechanism model for ethylene plant,real-time tracking of production and on-line optimization can be realized to achieve the best economic operating point. In addition, oriented by prices of raw materials,products and utilities,automatic operation of the whole plant is performed to reduce human intervention in optimization and implementation. Through research and analysis of RTO technology,the goals of yield increase,energy saving and consumption reduction could be achieved.

Key words: real-time optimization, online optimization, advanced process control (APC), ethylene plant

摘要： 乙烯产业是重要的石化基础产业,对国民经济、石油化工产业及工业社会起着举足轻重的作用,近年来 在我国经济增长过程中保持着蓬勃发展的态势,但是,由于我国乙烯生产总体技术水平的相对滞后以及乙烯工 业所供原料复杂等因素,导致我国目前乙烯装置与世界乙烯生产先进水平存在一定差距,为了减小这一差距, 达到世界先进水平,离不开工业过程自动化和运用实时优化技术。为此,本文介绍了实时优化技术的国内外发 展现状和该技术在乙烯装置的应用情况,并通过实时优化系统的实施,建立了乙烯装置的全流程严格机理模型, 可以实时跟踪乙烯装置的生产情况,持续不断对装置进行在线优化,使装置的操作达到最佳的经济效益操作点, 此外,在优化中以装置的原料、产品和公用工程等价格为导向,对全装置生产过程自动操作执行,减少了优化 计算和结果执行中的人为干预。分析表明实时优化技术有效实现了乙烯装置增产、节能和降耗的目标,可为乙 烯生产企业创造新增经济效益。

关键词: 实时优化, 在线优化, 先进控制, 乙烯装置