Folko Flehmig, Rüdiger von Watzdorf, Wolfgang Marquardt:
Dynamic MSF plant modeling and simulation: model validation and simulation studies
In: Encyclopedia of Desalination and Water Resources (DESWARE), EOLSS Publishers Co. Ltd., Oxford, UK, EOLSS Publishers Co. Ltd., Oxford, UK, 2000
This article focuses on dynamic modeling for MSF desalination plants. An extensive set of dynamic test data has been collected during large-scale experiments on a 20 stage brine recycle plant to validate the suggested model. Simulation studies of the actual plant tests are presented and compared to the measured data. For high top brine temperature operation, the proposed model shows excellent steady-state and dynamic predictions for all important process quantities. Even the evaporator brine levels are accurately predicted considering the high signal-to-noise ratio present in the measurements. For low top brine temperature operation, the phenomenon of vapor blow through has been identified from the measured data to occur simultaneously on several evaporator stages in conjunction. Transition between submerged flow and blow through conditions lead to a very sudden and strong changes of the affected brine levels, a phenomenon the model is not capable to predict. It is shown that such blow through transitions have minor but noticeable impact on the top brine temperature dynamics. Nevertheless, acceptable predictions for key process quantities are achieved despite blow through transitions.