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Abstract
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Considering the high installation cost of renewable systems and reliance on weather conditions,
as well as high energy consumption in post-combustion carbon capture system, the use of the
combined method can assist to achieve net-zero carbon emission. Carbon dioxide (CO2) capturing
based on renewable energies is introduced as a practical emission-control tool and method to tackle
environmental, economic, and social challenges. In this study, to present a novel and optimized CO2
capture system an integrated layout is presented to facile and efficient utilization of fossil fuels. This
layout is comprised of two sub-sections: a combined gas and steam power production unit, and
a geothermal-assisted CO2 capture unit. The presented layout is simulated and its performance is
evaluated concerning exergy analysis. In addition, sensitivity analysis is carried out to show the effect
of changes in some influential parameters on the overall performance of the designed layout. Obtained
results show that the presented scheme obtains a total thermal efficiency of 43.11%. In addition, the
heat duty in the CO2 capture section is obtained to be 3.689 MJ/kgCO2 expressing the effectiveness of
the presented scheme for the CO2 post-production procedure. The exergy study demonstrates that
maximum irreversibility happens in the combustion chamber (47.43%), heat exchangers (35.05%),
and turbines (6.257%). Besides, sensitivity assessments declare that the natural gas flow rate and
the number of stages in the stripper column are the two crucial variables that also influence other
functional parameters. The overall thermal efficiency increases up to 0.4331 and heat duty in the
carbon dioxide capture section decreases to 3.725 MJ/kgCO2 when the stage number in the stripper
column increases from 5 to 19.
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