Efficiency maximization of a quadruple power generation system with zero carbon emission

초록

This study proposes a system layout that provides a very high efficiency of around 75% while achieving an extremely high carbon capture rate approaching 100%. The system is a quadruple power generation system combined with an oxy-combustion carbon capture which allows for a very small efficiency penalty. The quadruple system produces power from a solid oxide fuel cell, molten carbonate fuel cell, gas turbine, and organic Rankine cycle. Through a comparison among post-combustion, pre-combustion, and oxy-combustion carbon capture techniques, the oxy-combustion capture system was selected as a candidate for the zero-carbon emission system because it turned out to exhibit the highest efficiency. A parametric analysis revealed that only five of eight design parameters affect the carbon capture rate. The results of the parametric analysis were used for an artificial intelligence method combining an artificial neural network and a genetic algorithm to maximize both the carbon capture rate and system efficiency. As a result, the efficiency penalty was minimized while achieving zero carbon emission. The net efficiency of the resulting carbon-free oxy-combustion system was predicted to be 75.4%, which is only 2.7% points lower than that of a reference oxy-combustion system without carbon capture. (c) 2021 Elsevier Ltd. All rights reserved.

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