pynamic modelling of the sugar extraction process from sugar beet

摘要

Dynamic modelling of the sugar extraction process from beet was carried out, and the resulting first-order partial differential equations written for three main constituents of the system (sugar, non-sugars and water) were solved numerically by an implicit finite-difference algorithm. The model was able to predict the axial concentration profiles and the process variables such as Brix, purity and the percentage of sugar and non-sugar components diffused during the process at the exit streams. The results of the model were compared with the experimental data obtained from an industrial plant and a close agreement was observed. Furthermore, in an industrial extraction plant, it is always desirable to maintain a constant and uniform flow of materials exiting the tower to ensure that the properties of the effluent streams are not changed. To achieve this, a proportional integral (PI) controller was installed in the process to control the liquid level in the tower.