Modeling a high output marine steam generator feedwater control system which uses parallel turbine-driven feed pumps

Parallel turbine-driven feedwater pumps are needed when ships travel at high speed.In order to study marine steam generator feedwater control systems which use parallel turbine-driven feed pumps, a mathematical model of marine steam generator feedwater control system was developed which includes mathematical models of two steam generators and parallel turbine-driven feed pumps as well as mathematical models of feedwater pipes and feed regulating valves.The operating condition points of the parallel turbine-driven feed pumps were calculated by the Chebyshev curve fit method.A water level controller for the steam generator and a rotary speed controller for the turbine-driven feed pumps were also included in the model.The accuracy of the mathematical models and their controllers was verified by comparing their results with those from a simulator.