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针对对二甲苯(PX)装置异构化单元在操作和控制中存在的问题,通过机理分析,在该装置首次提出了用宏观反应热衡量反应深度,并实现了反应热的实时计算;在此基础上建立了整个异构化单元基于状态空间模型的多变量预估控制系统,并在该装置得到了成功地应用。通过对加热炉、反应器以及精馏塔进行协调控制,实现了产品质量的卡边控制,极大地提高了装置控制平稳率和安全性,提高对二甲苯收率0.37%,整个装置的综合能耗降低6.318 kg(EO)/t,同时获得了显著的经济效益,综合经济效益估算可达1 009万元/年。
In view of the problems existing in the operation and control of isomerization unit of p-xylene (PX) unit, the mechanism was first proposed to measure the reaction depth by macro-reaction heat and real-time calculation of reaction heat Based on the establishment of the whole isomerization unit based on the state space model of multivariable predictive control system, and the device has been successfully applied. By coordinating and controlling the heating furnace, the reactor and the rectification tower, the card edge control of the product quality is realized, the stability and safety of the device control are greatly improved, the yield of p-xylene is increased by 0.37%, the comprehensive energy of the whole device The consumption is reduced by 6.318 kg (EO) / t, meanwhile, significant economic benefits are obtained. The comprehensive economic benefit is estimated to be 10.9 million yuan / year.