论文部分内容阅读
聚丙烯是当今世界5大通用树脂之一,因其优秀的热塑性能使之在工业生产中的应用逐年增加。因此,生产装置和设计公司对各牌号聚丙烯在生产加工中的指标控制也日趋严格,对其工艺的优化也在不断地探讨和实践。本文以中国石油庆阳石化公司10万吨/年聚丙烯装置为基础,结合Honeywell公司的UniSim Design为基础建模平台建立操作工仿真培训系统(OperatorTraining System)。对Basell公司的Spheripol工艺进行全流程模拟与分析,确定与验证合理的操作参数与控制条件。并且还针对Spheripol的环管反应器进行专门的模拟与讨论,应用Honeywell机理优化差值矩阵模块,并进行适当的改进,通过快速迭代和实时收敛大大减轻了各个硬件节点的计算负荷,运用软硬件相结合的双层法在内层建立稳定的机理模型,在外层建立优化的控制模型。同时在计算结果的基础上分析了反应物与产物在环管反应器中的动态特性,以及主要操作条件的变化对浆液密度、反应温度等重要指标的影响,指出了环管反应器在70℃～80℃范围会出现控制临界点,建立了符合其性能的操作指标和优化目标。为实际反应器的生产操作提供了理论依据,并且对今后探讨DCS与OTS的组合计算,软节点与硬节点的集成先进控制策略的制订,以及配合其他工具进行故障诊断和离线优化,都具有重要的指导意义。
Polypropylene is one of the 5 major general-purpose resins in the world today, increasing its use in industrial production due to its excellent thermoplastic properties. Therefore, the production equipment and design companies on the various brands of polypropylene in the production and processing indicators have become more stringent, the optimization of their processes are also constantly explore and practice. Based on 100,000 tons / year polypropylene plant of PetroChina Qingyang Petrochemical Company, this article combined with Honeywell’s UniSim Design as the foundation modeling platform to establish OperatorTraining System. Basell’s Spheripol process for the entire process of simulation and analysis to determine and verify the reasonable operating parameters and control conditions. In addition, the loop reactor of Spheripol is also simulated and discussed. The Honeywell mechanism is used to optimize the difference matrix module and make appropriate improvements. By fast iteration and real-time convergence, the computation load of each hardware node is greatly reduced. The combination of two-tier method in the inner to establish a stable mechanism model, the outer layer to establish an optimized control model. On the basis of the calculated results, the dynamic characteristics of the reactants and products in the loop reactor and the influence of the main operating conditions on the important indexes such as the slurry density and the reaction temperature are analyzed. ~ 80 ℃ will appear control the critical point, established in line with its performance of the operating indicators and optimization goals. It provides a theoretical basis for actual reactor production and operation, and is of great importance for the future research on combination calculation of DCS and OTS, development of integrated advanced control strategy for soft nodes and hard nodes, and fault diagnosis and offline optimization with other tools The guiding significance.