Optimization-based strategies for the operation of low-density polyethylene tubular reactors: Moving horizon estimation
Optimization-based strategies for the operation of low-density polyethylene tubular reactors: Moving horizon estimation
复制标题
DOI：
10.1016/j.compchemeng.2008.10.008
复制
发表时间：
2009-01
期刊：
影响因子：
--
通讯作者：
V. Zavala;L. Biegler
中科院分区：
文献类型：
--
作者：
V. Zavala;L. Biegler
我们提出了一个滚动时域估计（MHE）的多区低密度聚乙烯（LDPE）管式反应器的应用。该策略采用了第一性原理的动态模型，包括大型的非线性偏微分和代数方程组（PDAE）。研究发现，沿着反应器分布的有限温度测量值足以推断空间和时间上的所有模型状态，并跟踪不确定的时变现象，例如结垢。一个完整的离散化策略和一个国家的最先进的非线性规划（NLP）求解器被用来使该方法的计算可行性。它表明，MHE估计具有快速的性能，非常适合于工业利益的应用。
We present a moving horizon estimation (MHE) application for multi-zone low-density (LDPE) polyethylene tubular reactors. The strategy incorporates a first-principles dynamic model comprised of large sets of nonlinear partial, differential and algebraic equations (PDAEs). It was found that limited temperature measurements distributed along the reactor are sufficient to infer all the model states in space and time and to track uncertain time-varying phenomena such as fouling. A full discretization strategy and a state-of-the-art nonlinear programming (NLP) solver are used to enable the computational feasibility of the approach. It is demonstrated that the MHE estimator exhibits fast performance and is well suited for applications of industrial interest.