The on-line pressure vessel rheometer for concentrated coal slurries

Document Type

Article

Publication Date

1-1-2002

Abstract

At present, there are no commercially available rheometers that can make on-line measurements of the Rheological types of settling particulate slurries. To accomplish this measurement, a pressure vessel rheometer has been developed for on-line rheological measurements of concentrated suspensions. This rheometer is simple in construction and uses standard pressure transducers and flow valves to make all necessary measurements of slurry flow through a calibrated tube. This simple design is made possible by the use of a sealed vessel to receive the slurry sample, which provides a means both for measuring the flowrate by monitoring the pressure and for smoothly varying the flowrate so that a complete rheological curve can he determined. Using this instrument, flow curves of two different coal slurries were determined. The first coal slurry sample consisted of coal ground to pass 106 μm and was suspended at a concentration of 52 wt % solids. The second sample consisted of coal ground to pass 850 μm, and was suspended at a concentration of 58 wt % solids. Results obtained from the pressure vessel rheometer showed that the behavior of the coal slurry with -106 μm material was pseudoplastic with yield type flow, and the flow type of the sample with -850 μm coal was represented by the Bingham plastic model. Copyright © 2002 Taylor & Francis.

Publication Title

Coal Preparation

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