Abstract
This research has been done with the aim of responding to two main human challenges, i.e. lack of energy resources and environmental issues. In this research, a new zero-emission system for producing power, liquid carbon dioxide, and liquid nitrogen has been evaluated from a techno-economic point of view, and then the optimal conditions of the system have been selected through multi-objective optimization. The primary energy source of the system is the biomass, which is produced through gasification with the oxygen produced by the ion transport membrane of syngas with high heating value. The integration of the gasification process with the ion transport membrane makes it possible to use the produced high-temperature syngas to heat the compressed air entering the ion transport membrane. The produced syngas enters the supercritical carbon dioxide oxy-fuel cycle as a fuel and produces power with zero carbon dioxide emissions. The oxygen required for oxy-fuel is again supplied through an ion transport membrane. In order to store and transport the carbon dioxide captured from oxy-fuel and the nitrogen output from the ion transport membrane, the Claude liquefaction cycle has been used. Before optimization, the payback time of the system was 11 years, whereas, by including the minimization of payback time and total annual operating cost of the system as the objective functions of optimization the payback time of the system was decreased, and the operating cost of the system was increased. The lowest payback time of the system was 5.7 years, and the corresponding operating cost was 46.58 M$/year. However, when the operating cost of the system reached its lowest value in the Pareto Front, it was associated with a 13 % decrease, while the payback time was associated with an increase of 263 %.
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