Swelling Constrained Control of an Industrial Batch Reactor Using a Dedicated NMPC Environment: OptCon
Swelling Constrained Control of an Industrial Batch Reactor Using a Dedicated NMPC Environment: OptCon
复制标题
使用专用 NMPC 环境对工业间歇式反应器进行膨胀约束控制：OptCon
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
K. Hungerbuehler
中科院分区：
文献类型：
--
作者：
L. L. Simon;Z. Nagy;K. Hungerbuehler
这项工作介绍了非线性模型预测控制（NMPC）在模拟工业间歇式反应器中的应用，该反应器因反应器液位膨胀而受到安全约束。该反应受到平衡限制，其中一种产物处于气相，并且催化剂在反应器中分解。催化剂在批次期间以离散的时间步骤进料，终点目标是固定时间内的最大转化率。反应动力学由温度曲线和催化剂喷射决定，而化学平衡通过在低压下操作并除去其中一种产物而改变。然而，由于反应产生的气体或蒸气流，形成的蒸气导致液体膨胀。因此，反应物质可能进入管道和冷凝器，造成生产力损失和安全隐患。该问题的终点目标函数（最大转换）可以转换为水平设定点跟踪问题。该控制方法基于移动地平线 NMPC 方法，控制器中使用了详细的反应动力学和流体流体动力学第一原理模型。 NMPC 方法基于在用户友好的软件环境 OptCon 中实施的顺序二次规划 (SQP) 算法。 NMPC 中快速实时迭代方案的应用允许使用小采样周期，从而最大限度地减少由于采样周期内的干扰而违反最大级别约束的情况。
This work presents the application of nonlinear model predictive control (NMPC) to a simulated industrial batch reactor subject to safety constraint due to reactor level swelling. The reactions are equilibrium limited, one of the products is in vapor phase, and the catalyst decomposes in the reactor. The catalyst is fed in discrete time steps during the batch, and the end-point objective is the maximum conversion in a fixed time. The reaction kinetics is determined by the temperature profile and catalyst shots, while the chemical equilibrium is shifted by operating at low pressure and removing one of the products. However, the formed vapor causes liquid swelling, due to the gas or vapor stream resulted from the reaction. As a result reaction mass may enter in the pipes and condenser, creating productivity losses and safety hazard. The end-point objective function (maximum conversion) of this problem can be converted into a level set point tracking problem. The control method is based on the moving horizon NMPC methodology and a detailed first-principles model of reaction kinetics and fluid hydrodynamics is used in the controller. The NMPC approach is based on the sequential quadratic programming (SQP) algorithm implemented in a user-friendly software environment, OptCon. The application of the fast real-time iteration scheme in the NMPC allows the use of small sampling period minimizing this way the violation of the maximum level constraints, due to disturbances within sampling period.