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  • 1
    Electronic Resource
    Electronic Resource
    Sliding-mode Observer for Uncertainty Estimation in a Class of Chemical Reactor: A Differential-Algebraic Approach (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Chemical product and process modeling 2 (2007), S. 10 
    Details
    ISSN: 1934-2659
    Source: Berkeley Electronic Press Academic Journals
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The problem of the on-line estimation of the reaction heat in a continuous stirred tank reactor from temperature measurements is addressed in this paper. The proposed uncertainty observer is based on differential algebraic techniques, such that the algebraic observability condition of the uncertainty from noisy temperature measurements is easily verified and the observer structure is very simple, which lead to feasible implementation. The observer proposed is robust against noisy measurements and sustained disturbances. The good performance of the observer is shown by means of numerical simulations and is compared with a nonlinear Luenberger-type observer.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/cppm/vol2/iss3/10
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Robust Temperature Stabilization for Fluid Catalytic Cracking Units Using Extended Kalman-Type Estimators (2006)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Chemical product and process modeling 1 (2006), S. 3 
    Details
    ISSN: 1934-2659
    Source: Berkeley Electronic Press Academic Journals
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Fluidised-bed Catalytic Cracking (FCC) units, are one of the most complex and interactive processes in the refining industry, hence they are difficult to operate and to control; on the other hand they are one of the main producers of gasoline, which is an incentive to improve operation policies. This work deals with the design of regulative control law for stabilisation of reactor and regenerator temperatures considering that kinetics terms are poorly known, which is the industrial case. This control law uses on-line estimates of the heat of reaction, obtained from Kalman-like filtering of measured temperatures. The controllers designed are similar to standard input-output linearising controllers and can be tuned by standard techniques. Performance of the estimation technique under closed-loop operation is analysed by numerical simulations, considering noisy measurements and time delay in the regenerator control input.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/cppm/vol1/iss1/3
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Outlet Temperature Regulation for a Class of Plug Flow Chemical Reactor via Nonlinear Feedback (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    International journal of chemical reactor engineering 5.2007, 1, A25 
    Details
    ISSN: 1542-6580
    Source: Berkeley Electronic Press Academic Journals
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The aim of this paper is the regulation of the temperature, at outlet conditions, for a class of plug flow chemical reactors. The considered reactor is modeled by a set of hyperbolic partial differential equations, as related to mass and energy balances, with consideration that the measured output for this kind of systems is the outlet temperature, as is usual with industrial practice. It is proposed that in nonlinear feedback which contains a proportional contribution of the named regulation error plus a high order sliding-mode term-to-tray to compensate for the convective transport, the nonlinear terms and disturbances employing the stabilizing effects of the sliding modes have a satisfactory performance. A theoretical frame for the stabilization properties of the proposed controller is provided and numerical simulations illustrate the corresponding performance, which is compared with a well tuned PI control law.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/ijcre/vol5/A25
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On-line Monitoring in an Aerobic Batch Bioreactor Employing a Robust Soft Sensor (2006)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Chemical product and process modeling 1 (2006), S. 7 
    Details
    ISSN: 1934-2659
    Source: Berkeley Electronic Press Academic Journals
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The main objective of this work is to design a soft sensor with finite convergence time for a class of batch reacting systems. Considering the necessity to fast response for monitoring and control issues for batch processes a finite time high order sliding-mode observer is considered. Theoretical analysis is developed to demonstrate the convergence properties of the proposed observer and the finite time of convergence is calculated from the analysis. A simple model for a batch wastewater bioreactor corrobored experimentally is proposed as application example and numerical experiments show the adequate observer performance compared to a standard nonlinear Luenberger observer.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/cppm/vol1/iss1/7
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Tracking Trajectories in a Continuous Anaerobic Bioreactor Employing a Nonlinear Proportional Controller (2007)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    International journal of chemical reactor engineering 5.2007, 1, A73 
    Details
    ISSN: 1542-6580
    Source: Berkeley Electronic Press Academic Journals
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: This work is related to the tracking of sulfate concentration trajectories in a continuous anaerobic bioreactor, where Desulfovibrio alaskensis is considered for different operation purposes. A new design of a class of nonlinear proportional control law with an adaptive gain was proposed. The proposed controller was applied to the mathematical bioreactor's model with the kinetics experimentally corroborated; this describes the dynamics of biomass, sulfate and sulfide concentrations. The open-loop stability conditions of the optimum set points and the corresponding closed-loop performances were analyzed. The proposed control law is able to track trajectories, despite sustained disturbances. An Internal Model Control (IMC) Proportional-Integral Controller was implemented for comparison purposes and the corresponding performances were illustrated via numerical experiments.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/ijcre/vol5/A73
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    Paper (German National Licenses)
    Fulltext
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