Gas Turbine Design and Matching Research of Waste Heat Recovery System for Marine Diesel Engine

orc2019 Tracking Number 211

With the emphasis on energy and environmental protection, energy-conservation and emission-reduction become vital issues for industrial development. Moreover, with the development of legislations on marine environment, the marine diesel engine has become a focus of energy saving and emission reduction for ships. For low-speed diesel engines under high load, waste heat from exhaust gas can be recovered by the compact and efficient gas turbine. In this paper, the matching design research between low speed diesel engine and gas turbine is carried out. To balance efficiency and compactness, the impeller was adjusted and generated by ANSYS BLADEGEN, based on 1D thermodynamic design. And the 1D calculation is similar to the CFX simulation result: the total-static efficiency is 73.8% compare to 76.7%. Moreover, the flow separation was happened at the impeller suction side and created vortex which is mainly due to the high incidence angle. The non-design operating point simulation of the turbine shows though the pressure ratio increase will cause the efficiency decline a little, the total shaft power rises. In sum, this paper worked out a power turbine suitable for a low-speed diesel engine according to the turbine character matching design and simulation, which provides foundation to the construction of a steady operation waste heat recovery system for marine diesel engine.