Simulation and Sensitivity Analysis of Hydrogen-Oxygen-Burning CO₂-Free Gas Turbine Power Generation System

Abstract

A hydrogen-oxygen-burning CO₂-free gas turbine power generation system has been proposed as one of future high efficiency energy systems, in which the steam produced by utilizing waste heat from factories is used as the working fluid of gas turbine. A simulation model is constructed in this study to estimate power generation characteristics of the proposed system by adopting C + + language. It has been shown from simulation results that the proposed system has high exergetic efficiency, that is, the total exergetic efficiency is 66.2% and fuel-based one is 88.2% for a system utilizing steam with 200°C. Sensitivity analysis has also been carried out when usable steam temperature is changed, together with the case when condenser outlet pressure is changed. A modified system is proposed in this study to make it possible to utilize lower temperature waste heat; that is, a system incorporated a waste heat recovery boiler (WHB). It has been shown that the modified system can make use lower temperature steam than the original proposed system, although its efficiency is deteriorated than the one of the system without a WHB. The characteristics of the system when methane gas is usedinstead of hydrogen have also been investigated in this study.