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Controlling a continuous stirred tank reactor for zinc leaching

机译：控制连续搅拌罐反应器用于锌浸出

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摘要

This work focuses on the open-loop and closed-loop analysis of a continuous stirred tank reactor for zinc leaching from sphalerite (ZnS) via modeling and simulation approaches. The corresponding process analysis is based on a multi-input multi-output, approach by considering the inlet flows of minerals, acid solution, and aeration as process inputs and dissolved oxygen, ZnS concentrations, and pH as process outputs. An analysis of the relative gain array matrix was performed to determine the best control input pairs. In addition, a bifurcation analysis was carried out considering the process inputs as bifurcation parameters to show adequate operating regions. A local stability analysis of the selected equilibrium points in the chemical reactor under the previously selected operating conditions is presented, employing an eigenvalue analysis. Finally, a class of smooth super twisting sliding-mode controller is proposed to regulate the corresponding dissolved oxygen and pH in the reactor, which leads to increased sphalerite leaching; its performance was compared with a standard super twisting sliding-mode controller. The controllability of the reactor was analyzed via the dynamic behavior of the uncontrolled variables (zero dynamics). Numerical experiments show the satisfactory performance of the proposed controller under the selected operating conditions.
机译：这项工作侧重于通过建模和仿真方法从闪锌矿（ZNS）浸出的连续搅拌罐反应器的开环和闭环分析。相应的过程分析基于多输入多输出，通过考虑矿物质，酸溶液和通气的入口流量作为过程输入和溶解氧，ZnS浓度和pH作为工艺输出。执行对相对增益阵列矩阵的分析以确定最佳控制输入对。此外，考虑到进程输入作为分叉参数的进程分析，以显示足够的操作区域。提出了在先前选择的操作条件下的化学反应器中所选平衡点的局部稳定性分析，采用特征值分析。最后，提出了一类平滑的超扭转滑动模式控制器，以调节反应器中相应的溶解氧和pH，这导致散热率增加;将其性能与标准超扭转滑模控制器进行比较。通过不受控制的变量（零动态）的动态行为来分析反应器的可控性。数值实验表明，在所选操作条件下提出的控制器的令人满意的性能。

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