Effect of Scale Resistance on Steam Consumption of Cane-Juice Evaporation
Keywords:
Evaporator, Cane juice, Scale resistance, Steam consumptionAbstract
The sugar evaporation process, composing of a pre-evaporator and two-paralled quintuple effects (train A and train B), for this case study was investigated. Results has founded that the scale resistance of deposited fouling on PE throughout the milling season reached to 73.26 m2 oC/kW. Based on the present total juice inlet of 532.82 ton/h with the same evaporation area and steam quality usage at maintaining the syrup quality, increasing of juice inlet feed rate ratio of train B to train A gave the decrease of steam consumption for evaporation train A. The heat transfer was then reduced that resulting to an increase of scale resistance which in contrast to the phenomenon in train B. Juice scale deposited on the juice tube composed of organic crystalline of various elements such as O, C, Ca, Na, P, Fe, Mg, and K. Compared to the present cost, based on the calculated steam cost of 463.56 baht/ton at the juice inlet flowrate ratio of train B to train A of 0.65, and the total juice feed rate of 520-525 ton/h, the expense on total steam consumption was decreased.
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