Dynamic Optimization of Ship Boiler Startup Based on Modelica and JModelica.org

Apply optimization method to reduce the startup time can improve the maneuverability of vessel and reduce the operation cost of the unit. In this paper, a boiler system model was developed to capture system dynamic and the variety of stress based on the multi-domain modeling language Modelica, then the optimization model was built taking minimize the start-up time as optimization targets, constrained on the thermal and mechanical stress. The optimization process was performed on the platform of JModelica.org, exploiting the direct collocation method. Fuel quantity curve of the start up phase was optimized. Using the optimized fuel quantity curve, the boiler startup time could be reduced without reducing the drum boiler life.