Resumo

TRIANA, MANUEL ALEJANDRO; AYALA, MARCOS ALEXANDER; DE LA PUENTE, FRANCISCO  e  CAMARGO-AMADO, RUBEN. DEGREE AND THERMAL EFFICIENCY TO SCREW CONVEYOR DRYER. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.165, pp.196-206. ISSN 0012-7353.

This paper shows the drying degree and the thermal efficiency for the calcium acetate di-hydrate drying carried out in a screw conveyor dryer (SCD), of 8.66 m length and 0.17 m screw diameter. The experimental variables to factorial design (mixed design 2x3²) were: the screw speed (N) in two levels, the temperature (T) of the solid feedstock to the screw in three levels, and the feeding flow (C) in three levels. In the experimental runs the solid’s initial moisture was between 50-70%, and it was obtained a maximum drying degree of 14% and maximum thermal efficiency of 88%. The multivariate optimization of the two response variables was carried out starting from the regression models from the ANOVAS obtained in StatGraphics 5.1. For the incomplete design the global optimum point was in 45 ºC, 8 L/min and 3 rpm, which coincides with the optimum experimental point.

Palavras-chave : Screw Conveyor Dryer (SCD); ANOVA; imcomplete design; multivariate optimization; StatGraphics 5.1 Plus.

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