Modelling the cake filtration on a cylindrical rotary Nutsche

Abstract

The cylindrical rotary Nutsche is constructed like a circular drum with the bottom half being used as filter area. The drum is placed on four wheels and simple rope drive enables the drum to oscillate. This arrangement should has several advantages in comparison with a classical planar Nutsche. However, for the prediction of filtering performance of the rotary Nutsche, equations of filtration should be used taking into account the variability of filter face area during the filtration period. In this paper, a numerical model has been proposed for the calculation of a constant pressure cake filtration on a cylindrical Nutsche in nonoscillating regime. The results of numerical solution of the model for filtration of diatomite and cellulose suspensions are compared with those obtained in testing the filtering ability of a pilot plant cylindrical rotary Nutsche.