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Exergoeconomic Analysis of the Allam Cycle
- Rodríguez Hervás, Gonzalo, Petrakopoulou, Fontina
- Energy & fuels 2019 v.33 no.8 pp. 7561-7568
- carbon, carbon dioxide, cost effectiveness, electricity, fossil fuels, fuel combustion, global warming, greenhouse effect, greenhouse gas emissions, thermodynamics
- Greenhouse gas emissions from fossil fuel combustion is one of the main causes of global warming. Carbon capture, storage, and/or utilization consists of technologies and measures focused on diminishing anthropogenic emission of carbon dioxide (CO₂), an important contributor to the greenhouse effect. One of the most promising methods for carbon capture is oxy-combustion, for which several innovative alternatives have been proposed in recent years. This paper evaluates a thermodynamic cycle known as the Allam cycle. The novelty of this plant lies in the fact that the cycle uses supercritical CO₂ as the working fluid of the process. The evaluation is performed using exergetic, economic, and exergoeconomic analyses. The election of an exergy-based methodology rather than a conventional energy-based analysis is motivated by the better characterization of the thermal system achieved by the first. The goal is to assess the cost effectiveness of the cycle and to determine a way to optimize it by design changes and other modifications. Overall, we find that the calculated efficiency and cost of electricity can compete with other low-emission technologies, but they are higher than those of the currently operating combined cycle plants.