15. Interdisciplinary

Oxygen-hydrogen combustion power generation system is a promising large-scale, highly efficient power generation technology for a decarbonized society. The primary gas turbine inlet conditions are 1550 °C and 100 bar. Therefore, oxygen-hydrogen combustion requires high-pressure and high-purity oxygen produced by cryogenic air separation. A large amount of power is required for both air separation and oxygen compression. Leading to a significant decrease in net thermal efficiency. In this study, we used the process simulator Aspen Plus to analyze the effect of reducing specific energy consumption in high-pressure oxygen production by cryogenic air separation using liquid hydrogen cold energy and liquid-phase oxygen pressurization. O2 compression in the liquid-phase has been shown to greatly reduce the compression power by 99.1% to 96.7% compared to the gas-phase O2 compression. Furthermore, the specific energy consumption (SEC) was reduced from 44% to 30% by the liquid-phase pressurization of O2 with hydrogen cold energy.

Prof.

Tomohiro Nozaki

Corresponding author