Abstract
Despite wide application in the process industries, the effects of settling particle characteristics on gas dispersion and solid suspension at elevated temperature have received little attention. Power consumption, gas holdup, and critical just-suspension agitation speed for different concentrations of solid particles have been measured in a fully baffled dished-base vessel of 0.48 m diameter holding 0.145 m3 liquid. The impeller configuration (a hollow half-elliptical blade dispersing turbine below two up-pumping wide-blade hydrofoils, identified as HEDT + 2WHU) recommended in previous work has been used in this paper. Air, deionized water, and glass beads of ∼90 μm diameter and density 2500 kg·m-3 were used for all experiments. The operating temperatures were 24 and 81 °C, identified as cold and hot, respectively. Results show that the relative (gassed-to-ungassed ratio) power demand, RPD, in a hot sparged system decreases slightly with an increasing solid concentration. This becomes less evident at low...
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