Proposal of a new high-efficient gas turbine power generation system utilizing waste heat from factories

Abstract

It has been required to reduce the emission of CO 2 for mitigating the global warming. As one of means for reducing CO 2 emission, constructing high-efficient power generation systems is important, since the quantity caused by power generation is enormous and high-efficient system has a possibility to be widely installed from the economic point of view. In this paper, a H 2 O turbine power generation system utilizing waste heat from factories is proposed. In the proposed system, the steam produced by utilizing waste heat from factories is adopted as working fluid of a gas turbine. Thus, the system can be high efficient because the most part of a turbine output can be used for driving electric power generator: this is different with a conventional gas turbine power generation system where approximately two third of turbine output is consumed to compress the working fluid gas (air). Simulation programs have been developed by using object-oriented-language C++ to evaluate various characteristics of the proposed system. The total exergetic efficiency of the system has been estimated to be 57.5% and the fuel-base exergetic efficiency to be 63.6%, when a refuse incineration plant has been taken as an example of waste-heat-emitting factories. The comparison with the characteristics of a gas turbine system using a. dual fluid cycle has also been performed. It has been shown that the proposed system has higher exergetic efficiency. The potential of CO 2 reduction by installing the proposed system was also investigated.