Abstract
The purpose of this work is to model the CaCO 3–CO 2–H 2O system in falling film on a bank of horizontal tubes. The model was applied on a 5-effects reference thermal vapor compression multiple-effect distiller (MED-TVC) operating at top brine temperatures (TBT) of 60–70 °C. The model can predict pH values, CaCO 3 deposition and fouling resistance with greater accuracy. Through the MED stages, the HCO 3 − and CO 2 concentrations slightly increased while the CO 3 2− concentration slightly decreased. The pH decreased from 8.8 in the first stage to 8.4 in the 5th stage. The CO 2 release rates as well as the CaCO 3 deposition rates increase with increasing top brine temperature (TBT). CO 2 release rates decrease from 36.4 g/t feed water in the first stage to 32.5 g/t in the last stage. The specific CaCO 3 deposition decreases from 127.3 g/t feed water in the first stage to 100.1 g/t in the last stage.
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