Modeling and simulation of bubbling hot well deaerator in condensers of ships

摘要

Application of deaerators in ship has been restricted due to space limitation. Thus far, the function of deaerator has been integrated into the hot well of the condenser. The condensate water would be heated to saturation by extracting steam from turbine, which would make the solubility of Oxygen in condensate water fall to zero according to Henry's law and Dalton's law. The purpose of this paper was to build a mathematical model of bubbling hot well deaerator in the condensers of ships. In this paper, the heat exchange rate was calculated by empirical formulas which took the specific structure and process of heat exchange into account. When the operating conditions were in the application ranges of the empirical formulas, the simulation model would be performed by utilizing them; otherwise, calculations would be done by the conservation of energy, which assured the simulation model could be used at any operating condition. Different from previous works, the solubility of Oxygen in heated condensate water could be calculated by an empirical formula. The simulation results showed that the structure and heat exchange process considered could be highly accurate at the steady-state operations, and the main parameters trend curves during dynamic-state operations were consistent with theoretical analysis. The solubility of Oxygen could be calculated and the simulation results at the steady-state operations were verified against the practical situation, the trend curves during dynamic-state operations were consistent with theoretical analysis. (C) 2015 Elsevier Ltd. All rights reserved.