Against the backdrop of the reduction of environmental impact and the development of shale
gas, natural gas resources have attracted a great deal of attention as a primary fuel for the future.
In its product lineup, Mitsubishi Heavy Industries Engine and Turbocharger, Ltd. (MHIET) offers a
high-speed GSR gas engine covering 305 to 1,500kW and the mid-speed KU30GSI model covering
3,650 to 5,750kW, both of which are applicable to small-scale distributed power generation,
co-generation in facilities or plants and dedicated utility power generation. This paper will
describe the technology for increased efficiency of the KU30GSI-Plus model, which achieved
power generating efficiency of 49.5%, and technologies relating to the all-steam recovery system
that is designed to utilize the engine cooling water by raising its temperature so that it could be
used as a heat source for steam recovery.
