Browsing by Author "Alvarez, PI"

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    Dynamic simulation and control of direct rotary dryers
    (ELSEVIER SCI LTD, 1998) Perez Correa, JR; Cubillos, F; Zavala, E; Shene, C; Alvarez, PI
    Adaptive and conventional control of a direct rotary dryer has been assessed through simulations. A dynamic model of the process was developed specifically for this purpose. The model is based on mass and energy balances and includes a drying kinetic derived from mass transfer principles. In the modelling process, ten discrete perfectly mixed elements were considered for the dryer with each containing four differential equations. A well tuned discrete PID and an adaptive algorithm were used to control the outlet solid humidity Bath controllers can regulate the controlled variable for different disturbances, although the adaptive controller is more effective. (C) 1998 Elsevier Science Ltd. All rights reserved.
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    Modelling and simulation of a direct contact rotary dryer
    (MARCEL DEKKER INC, 1996) Shene, C; Cubillos, F; Perez, R; Alvarez, PI
    A mathematical model able to predict solid and drying gas temperature and moisture content axial profiles along a direct contact rotary dryer was developed. The study was focused on the drying kinetics based on phenomenological models. Two different drying mechanisms in the decreasing drying rate period were tested: proportional to the unbound moisture content and moisture diffusion inside the particle. Experimental data collected in a pilot-scale direct contact rotary dryer was used to validate the model. Soya and fish meals were used as drying material.