Alexandria Engineering Journal (Oct 2023)
Design and analysis of an innovative biomass-powered cogeneration system based on organic flash and supercritical carbon dioxide cycles
Abstract
Technological advancements play a significant role in increasing energy demand. As societies progress, new technologies emerge, and they often require additional energy resources to operate. Therefore, it is important to design an efficient power system that can achieve higher performance. Additionally, considering the environmental aspect of the designed system is another crucial criterion for power system design. The current investigation proposes a renewable-based co-generation system for the production of power and heating load. The proposed system consists of several subsystems, including a municipal solid waste-driven gas turbine cycle, a supercritical CO2 cycle, and a high-temperature organic flash cycle. The system's performance is analyzed using energy, exergy, economic, and environmental approaches. Double-objective and triple-objective optimizations are applied to determine the optimum state of the system. The results indicate that the system can produce a net power of 8.21 MW and a heating load of 5.81 MW. This translates to energy and exergy efficiencies of 75.8 % and 41.21 % respectively, with a levelized CO2 emission of 0.518 t/kWh at the base-case. Furthermore, the system's payback period is estimated to be approximately 1.97 years, resulting in a net profit of 10.7 M$. In the parametric study, it was found that the gas turbine's inlet temperature has a significant impact on the system's performance indexes. Ultimately, the system achieves an exergy efficiency of 43.18 % and a levelized CO2 emission of 0.457 t/kWh at the optimum state. In conclusion, the proposed renewable-based co-generation system offers a promising solution for achieving higher performance, environmental sustainability, and economic viability in the design of efficient power systems. In conclusion, the proposed renewable-based co-generation system offers a promising solution for achieving higher performance, environmental sustainability, and economic viability in the design of efficient power systems.
