Global warming is one of the main issues facing humanity in the 21-st century. With high probability, an increase in the concentration of CO2 in the Earth’s atmosphere by 27 % over the past 60 years is the reason. Oxy-fuel combustion is a promising technology for carbon dioxide capture in power plants. Net efficiency of advanced cycles is more than 50 % (including oxygen production and carbon dioxide compression).
Due to multicomponent working fluid, which is a distinctive feature of these cycles, the problem of precise thermodynamic calculation and optimization arises. This study aims to present mathematical modeling methods for oxy-fuel combustion cycles. Emphasized attention is paid to semi-closed oxy-fuel combustion cycle (SCOC-CC). The algorithm of multi-iterative thermodynamic calculations of oxy-fuel combustion cycle with the cooled turbine is described. The results of pressure ratio optimization for different turbine inlet temperatures are presented. A significant influence of turbine stage cooling model on cycle performance is established.
