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Determine the optimum tube dimensions for Robert evaporators through experimental investigations and CFD modelling: final report 2012/054
(Sugar Research Australia Limited, 2017) Broadfoot, R
Experimental investigations were undertaken in a single tube pilot evaporator for nine tubes of three different lengths and three different diameters to determine the optimum tube dimensions for Robert evaporators. Heat transfer performance was determined at operating conditions typically encountered in sugar factory evaporators. Juice of three brix levels were selected to mimic conditions for the 1st, 3rd and 5th effects in a quintuple evaporator set. For each brix, the heat transfer coefficient (HTC) was calculated at four juice levels, two headspace pressures and two pressure differences between the steam chest and the headspace. Of the four juice levels, one juice level was identified as the optimum juice level corresponding to the maximum HTC. In total, 432 tests were undertaken with nine tubes and a further 128 tests were replicated with four tubes. The maximum HTC and optimum juice level results, linked together with a capital cost analysis and sucrose loss considerations, determined the preferred tube dimensions for Robert evaporators in a quintuple evaporator set.