摘要
聚丙烯牌号切换控制系统是基于装置DCS系统之上,采用"DCS层、软测量系统层、先进控制系统层、牌号切换器层"四层系统架构而实现。该系统克服了聚丙烯实际应用中无质量指标在线分析仪和闭环控制的问题,利用熔融指数、乙烯含量、等规度等软测量模型进行质量指标实时预测,并结合先进控制方案完成各指标的闭环控制,促使牌号切换能在先进控制系统驱动下平滑协调地完成,避免了人工调整的不一致性。该系统成功应用于国内某石化公司聚丙烯预聚合反应器和液相本体反应系统,保证了安全生产和产品质量指标的稳定,缩短切换时间30%以上,结果表明该系统的正确性和实用性。
The control system of polypropylene grade transition in the paper was realized based on the unit DCS system, which adopted four-layer architecture including DCS layer, soft sensor system layer, advanced process control layer and grade switcher layer. The system has solved the problem with no quality online analyzer and closed-loop control in practice. The quality index is predicted at real time making use of soft measurement model such as melt index, ethylene content and polypropylene. Combined with closed-loop control, the grad transition can be achieved under advanced control system which can avoid inconsistency made by manual adjustment. The system has been successfully applied in the polypropylene unit of domestic petrochemical company, which ensures the stability of the safety production and product quality, and reduces the 35 percent of grade transition time. The result proves that the system is correct and practical.
出处
《石油规划设计》
2016年第4期23-26,共4页
Petroleum Planning & Engineering
