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Modelling and on-line estimation of zinc sulphide precipitation in a continuously stirred tank reactor

机译:连续搅拌釜反应器中硫化锌沉淀的建模和在线估算

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In this paper the ZnS precipitation in a continuously stirred tank reactor (CSTR) is modelled using mass balances. The dynamics analysis of the model reveals that the ZnS precipitation shows a two time-scales behaviour with inherent numerical stability problems, which therefore needs special attention during implementation. The mass balance model allows the design of an on-line estimator of the zinc concentration and precipitation rate, given only wet-chemical measurements of the sulphide concentration and of the pH in the reactor. The on-line estimation algorithm, also called observer or software sensor, is tested in a simulation experiment with a block disturbance showing numerically stable results. Furthermore, on the basis of real-world experimental data, the observer shows an appropriate performance. The estimation procedure offers good possibilities to be applied for other metal removal processes.
机译:在本文中,使用质量平衡对连续搅拌釜式反应器(CSTR)中的ZnS沉淀进行建模。该模型的动力学分析表明,ZnS沉淀表现出两个时间尺度的行为,具有固有的数值稳定性问题,因此在实施过程中需要特别注意。质量平衡模型允许设计锌浓度和沉淀速率的在线估算器,仅给出反应器中硫化物浓度和pH值的湿化学测量。在线估计算法(也称为观察器或软件传感器)在模拟实验中进行了测试,其中块干扰显示了数值上稳定的结果。此外,根据现实世界的实验数据,观察者表现出适当的表现。估算程序为其他金属去除工艺提供了很好的可能性。

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