以某400万t/a煤制油装置为研究对象,在变换、净化、费托合成、加氢精制、裂化、油品精制、尾气制氢等主要流程中开展先进过程控制技术研究,针对系统氢碳比、变换反应器、费托反应器、精制裂化等核心单元及工艺指标控制,采用多变量控制、跨域控制、大系统协调控制等控制方法及策略,进一步提升了装置的自动化智能化水平,大大减少了手动操作,被控变量的标准偏差可以降低30%以上,实现关键指标的“卡边操作”,在保证产品质量的情况下降低能耗、提高收率,达到了预期控制效果,装置运行稳定性及经济性方面均取得了较大的提升。

A 4 million tons/year coal-to-liquid (CTL) plant is taken as the research object to study the advanced process control technology in major processes such as shift conversion,purification,Fischer-Tropsch synthesis,hydrogenation refining,cracking,oil products refining,and tail gas to hydrogen.In the light of core units and process indicators like system hydrogen-carbon ratio,shift reactor,Fischer-Tropsch reactor and refinement cracking,the control methods and strategies are adopted,including multi-variable control,cross-domain control,and large system coordinated control,which further enhances the level of automation and intelligence of the plant,significantly reduces manual operations,lowers the standard deviation of controlled variables by 30% at least,and achieves “edge operation” for key indicators.The energy consumption is reduced and the yield rises while ensuring product quality,achieving the expected control effect.The operational stability and economic efficiency of the plant have both been greatly improved.