Multi-objective analysis and optimization of cascade supercritical CO₂ cycle and organic Rankine cycle systems for waste-to-energy power plant

• Main Authors: Pan, Mingzhang, Chen, Xiaoting, Li, Xiaoya
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Electrical and electronic engineering; Supercritical CO2 Cycle; Organic Rankine Cycle
• Online Access: https://hdl.handle.net/10356/162877
• Institution: Nanyang Technological University

Waste-to-energy conversion technologies have been attracted extensive attentions due to the promising contribution not only to the municipal waste disposal but also to the electricity generation. Targeted at improving the energy conversion efficiency, this paper proposes a reheat, recompression and pressurized intercooling supercritical CO2 cycle/organic Rankine cycle system for waste incineration energy recovery. A comprehensive evaluation of the proposed system was carried out, including detailed energy, exergy, economic and environmental analyses, which leads to a follow-up multi-objective optimization. The results show that by adopting the proposed system, the energy efficiency, exergy efficiency and ecological efficiency were increased to 41.22%, 66.91% and 84.54%, respectively, while the dynamic payback period was reduced from 6.00 years to 1.11 years. Therefore, the proposed waste-to-energy power plant outperforms thermodynamically, economically and environmentally, which can be a competitive candidate in the reform of waste-to-energy incineration power plant.