Heat Balance Analysis And Dynamic Simulation In Marine Supercharged Boiler

Supercharged boiler is a steam power installation which provides combustion-supporting air with a certain pressure to the furnace by turbo-compressor. It adapts well to the boiler development direction of high reliability , light weight, excellent mobility etc.Depending on the structure of some type supercharged boiler in former Soviet Union,the main work of the dissertation was to analyse heat balance and dynamic characters of the flue gas and the steam water in supercharged boiler. Thermal characteristics on flue gas and steam water was analyzed. The boiler system mathematical model was built for dynamic simulation.Through the flue gas and air characteristic analysis in supercharged boiler,the results showed that the value of parameters would increase with the increase of fuel consumption.And volume heat load of the furnace, fuel consumption, heat change between flue gas and convective heating surface and evaporation value would increase with the increase of compression ratio.The heat calculation would be different because of dissimilar thermal calculation in the turbo-compressor when the boiler load was changed.As the boiler load increased,heat loss in the turbo-compressor would increase and the efficiency of the boiler would decrease.The results of the boiler start-up simulation showed that the time of start-up would decrease with the increase of flue consumption ,but instantaneous pressure amplitude would increase.Steam water's dymamic diversification would be more complex than flue gas's,and dynamic characters of their parameters would be changed due to different boiler load and disturbance variable,which was shown by results of the simulation when boiler load was changed.