Akademik Veri Yönetim Sistemi
Journal of Thermal Engineering, cilt.8, sa.6, ss.719-733, 2022 (ESCI)
Oxy-combustion technologies are clean energy systems with zero emission; they have great
potential when considering global warming and climate change. This study presents a detailed
thermodynamic analysis in terms of energy, environment, and economy. Consequently,
the results obtained for an oxy-combustion power system are presented in comparison
with a conventional gas turbine power system. The results are presented as a function
of the pressure ratio with regard to net power, input heat, system efficiency, sp ec ific fue l
consumption, equivalence ratio, fuel-air ratio, capital investment cost, fuel cost, oxygen cost,
total cost, electricity revenue, and net profit. In addition, t he study calculates t he pollutant
emissions from non-oxy-combustion systems and investigates the environmental costs.
The pressure ratio for maximum net power has been obtained as 20.8 in the conventional
gas turbine power system. Similarly, the pressure ratios for maximum net power in oxycombustion power cycles with 26%, 28%, and 30% oxygen ratios are 23.3, 27.4 and 29.7,
respectively. Results from 24% to 30% have been displayed to observe the effect of reactant
oxygen in the oxy-combustion power cycles. The optimum c y cle c o nditions have been
determined by calculating the costs of system components, total revenues, and net profits
at pressure ratios of 10, 20, 30 and 40. Finally, the results reveal the pressure ratio should be
reduced to minimize the total costs per cycle. For maximum net profit, the pressure ratio in
a conventional gas turbine power cycle has been calculated as 15.9; similarly, the pressure
ratios in oxy-combustion power cycles with 26%, 28%, and 30% oxygen ratios have been
respectively calculated as 12.8, 15.2 and 16.4.