Study On The Refrigerating System Combined With Power Turbine Aiming To Recover Waste Heat Of Marine Ships

The marine industry has developed very fast.The engine power of the ship is enomorous and the energy of the waste heat is sufficient.It is key to recycle the waste heat of the ship for the goal of energy conservation and emission reduction otherwise it would be lost.In addition,the refrigerating devices on ship have the demands of consuming energy.If the waste heat of the ship could be recovered for refrigerating system,it would be promising to solve the energy-consuming issue of refrigeration and achieve the goal of energy conservation and emission reduction.Within many methods of recycling waste heat,turbocompounding receive massive publicity for the merit of simple system structure.The goal of the paper focused on the difficulty of how to recycle and reuse waste heat energy efficiently,reduce the comsumption and improve the energy utilization ratio.Besides,this paper do research of the matching between the power turbine and the turbocharged engine and the actual working stability of the designed refrigerating system.Last,this paper made a reusing plan of the recovered energy.First,this paper established a fishing vessel diesel engine model with the GTPower of the GT-SUITE series.After the model was validated,the part of power turbine was added into the model to set up the charged turbine-power turbine simulation platform,namely the two-stage VNT series-parallel system simulation platform.Then the effective diameter was chosen as the variable to describe the flow ability of the turbines.The paper do research about the effect of the two-stage turbines flow ability on the whole system in the working mode of series and parallel respectively and made the optimized matching scheme considering the whole engine working conditions.Results show that the two-stage turbine system could achieve the working mode of series or parallel by controlling the three valves and eventually improve the whole system efficiency.In the system of series-parallel system,VNT could be used to control and optimize the flow ability of the two turbines,and optimize the match of the engine,the charged turbine and power turbine.In addition,this paper designed a refrigerating system suited for the waste heat recovery system and build the refrigerating simulation platform through GTSUITEmp of the GT-SUTIE series.Besides,this paper analyzed the stability in actual working condition and made an energy-recycling scheme in various working conditions.Results show that the refrigerating system through power turbine could work effectively even with the change of the temperature fluctuation of the sea water and frozen sea water compartment.Besides,the energy recovered by the power turbine could be used in the refrigerating system reasonably and this,in return,validate the rationality of refrigerating system through power turbine scheme.