先进过程控制技术在高密度聚乙烯装置上的应用

利用美国A spenTech公司的APC软件,在对高密度聚乙烯(HDPE)装置进行测试的基础上,开发设计了HDPE装置的先进过程控制方案,建立了产率、产品质量、浆液浓度及冷却系统等控制器。同时根据反应原理及对大量离线数据的分析研究,对没有在线仪表的质量参数进行了模型开发。使用A spenTech公司的牌号切换软件实现了HDPE装置产品牌号切换的优化,缩短了牌号切换的过渡时间,减少了过渡料量。通过实施APC软件,在HDPE装置上生产的产品质量波动明显减小,同时也提高了生产操作的稳定性和安全性。

Advanced Process Control Technology Used in Polyethylene Production

With APC software of AspenTech company,an advanced process control system was designed for production of high density polyethylene(HDPE).Yield controller,product quality controller,slurry concentration controller and cooling system controller had been designed and on trial in a commercial plant.According to reaction mechanism and analysis of huge amount of off-line data,a model was developed to fit quality-control parameters without installation of new on-line instruments.By implementing the software for switching between grades,the switching time shortened and amount of off-grades decreased.The switching operation was optimized.By application of APC software in HDPE plant,fluctuation of product quality was smoothed down,switching time shortened by 30%,and yield of main products increased about 5%.Stability and safety of operation improved.