The measurement of mixing efficiency of continuous mixers

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Abstract

A radiotracer method for testing the mixing characteristics of industrial continuous mixers in actual process conditions is described. The tracer is fed into the input of the mixer at a constant rate and the radiation in the output is measured by two properly collimated radiation detectors. The measurement yields data in the form of two time series which contain information about the radial and axial homogeneity of the tracer in the measuring point. The formulas connecting the information in the measurement data and the axial and radial concentration variation of tracer are derived by the methods of statistical mathematics. The values for experimental parameters are obtained by computer simulation of the radiation measurement geometry. The method was tested by measuring the increase of the homogeneity as a function of mixing distance in a static tube chlorine mixer in a pulp bleaching plant. Also some results obtained on another type of mixers showing the effect of pulp type on mixing are given. © 1982.

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Lehtola, S., & Kuoppamäki, R. (1982). The measurement of mixing efficiency of continuous mixers. Chemical Engineering Science, 37(2), 185–191. https://doi.org/10.1016/0009-2509(82)80153-X

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