Nonlinear Inferential Cascade Control of Exothermic Fixed-bed Reactors
Nonlinear Inferential Cascade Control of Exothermic Fixed-bed Reactors
复制标题
放热固定床反应器的非线性推理级联控制
DOI：
10.1002/aic.690460511
复制
发表时间：
2000
期刊：
影响因子：
3.7
通讯作者：
A. Jutan
中科院分区：
文献类型：
--
作者：
Xiangming Hua;A. Jutan
提出了一种用于强放热管式固定床反应器的非线性推理串级控制策略。在宽的操作条件范围内实现了出口转化率的严格控制和热点温度的稳定。通过将分布参数系统集总并划分为三个子系统，建立了多级级联结构。实现控制系统的实际问题得到解决，以及物理的洞察力和假设用于模型简化的每个子系统。采用非线性控制系统的直接综合方法，分别设计了重要子系统的控制器。在一次子系统中加入滞后环节，实现了二次子系统的快速稳定。未知的温度状态和进口浓度估计的非线性观测器从只有少数温度测量。研究了移动热点温度的控制问题。对苯酐固定床反应器的仿真结果表明，该观测器能对反应器进行良好的动态跟踪。所设计的串级控制系统具有良好的设定值跟踪和扰动抑制性能，对测量误差和模型失配具有鲁棒性，优于单回路控制系统的上级性能。
A nonlinear inferential cascade control strategy for a tubular fixed-bed reactor with highly exothermic reaction is presented. Tight control of exit conversion and stabilization of hot-spot temperature was achieved over a wide range of operating conditions. A multiple cascade structure was developed by lumping the distributed-parameter system and partitioning it into three subsystems. Practical issues of implementing the control system are addressed, as well as physical insight and assumptions used for model reduction of each subsystem. The direct synthesis approach for nonlinear control systems is used to design the controllers of the important subsystems separately. A lag was added in the primary subsystem, and fast stabilization of the secondary subsystem was implemented. Unknown temperature states and inlet concentration were estimated by a nonlinear observer from only a few temperature measurements. The control problem of the moving hot-spot temperature was also addressed. Simulation on an industrial phthalic anhydride fixed-bed reactor showed that the observer can give excellent dynamic tracking of the reactor. The resulting cascade control system can achieve good set-point tracking and disturbance rejection performance, which is robust in the presence of measurement error and model mismatch, and superior to a single-loop control system.
影响因子：
6.4
作者：
CLARKE, DW;MOHTADI, C;TUFFS, PS
通讯作者：
TUFFS, PS