Browsing by Author "Khelassi, A."

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    The assessment of interactions in ratios control schemes for a binary distillation column
    (2008) Bendib, R.; Khelassi, A.
    In this paper we will consider the most known ratios control schemes ((L/D, V/B),(L/D,V/F), Ryskamp’s, and (D/(L+D),V/B)) for binary distillation column and we compare them in the basis of interactions and disturbance propagation. The models for these configurations are deuced using mathematical transformations taking the energy balance structure (LV) as a base model. The dynamic relative magnitude criterion (DRMC) is used to assess the interactions. The results show that the introduction of ratios in controlling the column tends to minimize the degree of interactions between the loops
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    Assessment of the effect of feed plate location on interactions for a binary distillation column
    (2006) Bendib, R.; Khelassi, A.
    The paper considers the effect of feed plate location on the interactions in a seven plate binary distillation column. The mathematical model of the distillation column is deduced based on the equations of mass and energy balances for each stage, detailed model for both reboiler and condenser, and heat transfer equations. The Dynamic Relative Magnitude Criterion, DRMC is used to assess the interactions in different feed plate locations for a seven plate (Benzene-Toluene) binary distillation column ( the feed plate is originally at stage 4). The results show that whenever we go far from the optimum feed plate position, the level of interaction augments
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    Non–interacting fuzzy control system design for distillation columns
    (2005) Maidi, M.; Diaf, M.; Khelassi, A.; Bouyahiaoui, C.
    This paper proposes a fuzzy multiloop control design for a distillation column. The interaction that occurs between the strategic distillation column variables, which represent a major constraint to construct the rules base when the fuzzy multivariable control of the distillation control is considered, are reduced by introducing a compensator in cascade with the distillation column. The introduced compensator is designed using an interaction analysis method. Thus, a complete fuzzy rule base is generated for each loop independently without domain experts. The main advantage of the proposed fuzzy multiloop strategy is that the determination of the rule base is simplified and facilitated; besides a weak level of interaction and the control stability are guaranteed. Consequently, in comparison with the conventional multiloop control based on classical PI controllers, the fuzzy multiloop control achieves better control performance
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    Optimal fuzzy control to reduce energy consumption in distillation columns
    (2005) Bouyahiaoui, C.; Laaouad, F.; Khelassi, A.; Grégoriev, L.
    Distillation columns constitute a signi cant fraction of the capital invested in the re neries around the world; their control requires a major part of the total operating cost of chemical processes, if the used strategy is not adequate. This article presents the application of optimal fuzzy control to reduce the energy consumption of a Benzene-Toluene distillation column. This method is based on the determination of the speci c values of the fuzzy controller parameters such that certain performance criterion is minimised. Results of a simulation study are presented showing the potential improvement o ered by this method