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Software sensors design for the simultaneous saccharification and fermentation of starch to ethanol

机译：软件传感器设计，用于淀粉同时糖化和发酵为乙醇

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摘要

A local analysis of stability and observability of the ethanol process are determined for continuous operation. It is found that the process is stable and noncompletely observable in the selected steady states. The analysis of observability was studied in terms of the observability matrix rank conditions. Furthermore, we design a nonlinear observer in order to estimate the observable state variables. The software sensor (state estimator) is developed considering only one measurable variable, the glucose concentration, and taking in account model uncertainties, which is a realistic issue. Some sufficient conditions for the existence of the proposed observer are obtained, which guarantee the convergence of the proposed methodology. The maximum ethanol production conditions are obtained by manipulating the dilution rate with optimal initial substrate concentration and the observable subspace is determinate which allows estimating six state variables (starch concentration, susceptible starch concentration, ethanol concentration, biomass concentration, glucose concentration and enzyme concentration). Numerical simulations are provided to show the effectiveness of the proposed observer where a comparison with a standard sliding-mode observer is done.
机译：确定乙醇工艺的稳定性和可观察性的局部分析以用于连续操作。发现该过程在选定的稳态下是稳定的并且是不完全可观察到的。根据可观察性矩阵等级条件研究了可观察性分析。此外，我们设计了一个非线性观测器，以估计可观测的状态变量。开发软件传感器（状态估计器）时仅考虑一个可测量变量葡萄糖浓度，并考虑模型不确定性，这是一个现实问题。为提出的观察者的存在获得了一些充分的条件，这些条件保证了提出的方法的收敛性。通过以最佳的初始底物浓度控制稀释率来获得最大的乙醇生产条件，并确定可观察的子空间，从而可以估算出六个状态变量（淀粉浓度，敏感淀粉浓度，乙醇浓度，生物质浓度，葡萄糖浓度和酶浓度）。提供了数值模拟，以显示与标准滑模观察器进行比较时所提出的观察器的有效性。

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  • 来源
    《Fuel》 |2013年第8期|219-226|共8页
  • 作者

    Pablo A. Lopez Perez; Rafael Maya Yescas; Rigel V. Gomez Acata; Vicente Pena Caballero; Ricardo Aguilar Lopez;

  • 作者单位

    Department of Biotechnology & Bioengineering, GNVESTAV-1PN Av., Instituto Politecnico National, No. 2508, San Pedro Zacatenco, D.F., Mexico;

    School of Chemical Engineering, Universidad Michoacana de San Nicolas de Hidalgo, Ciudad Universitaria, Morelia, Michoacan, Mexico;

    Department of Biotechnology & Bioengineering, GNVESTAV-1PN Av., Instituto Politecnico National, No. 2508, San Pedro Zacatenco, D.F., Mexico;

    Department of Biotechnology & Bioengineering, GNVESTAV-1PN Av., Instituto Politecnico National, No. 2508, San Pedro Zacatenco, D.F., Mexico;

    Department of Biotechnology & Bioengineering, GNVESTAV-1PN Av., Instituto Politecnico National, No. 2508, San Pedro Zacatenco, D.F., Mexico;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Local observability; Nonlinear observer; Bio-ethanol; Modeling; State estimation;

    机译：局部可观察性;非线性观察者;生物乙醇造型;状态估计;

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