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A novel system for electricity and synthetic natural gas production from captured CO2: Techno-economic evaluation and multi-objective optimization

Beyrami, J ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcou.2022.102116
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. To mitigate global warming and fossil fuel shortages a novel oxy-fuel combustion power plant integrated with a power to gas system is proposed. A net-zero emission MATIANT cycle with inherent CO2 capture ability is selected as the power cycle also providing the CO2 and power demand of the power to gas system, which comprises a proton exchange membrane electrolyzer for hydrogen production and a Sabatier reactor for methanation. A techno-economic investigation, a multi-objective optimization, and a sensitivity analysis are carried out. A comprehensive economic method that covers all economic aspects is utilized, and a Sabatier reactor model which considers the possibility of the presence of solid carbon is employed to ensure the practicality of the investigations. It is shown that, when the multi-objective optimization maximizes the net power produced by the system with the lowest possible payback period, 95,700 kW of net power production with a 4.0 year payback period are obtainable. For the objectives of maximum LHV of synthetic natural gas and minimum payback period, a value of LHV of 31,200 kJ/kg with a 3.9 year payback period is attained. Finally, when the objectives are maximizing the produced power while keeping the LHV as high as possible, the net power production and LHV values are 96,200 kW and 31,300 kJ/kg, respectively. The sensitivity analysis indicates that the net power generated by the system and payback period are more sensitive to combustion temperature and high pressure turbine outlet pressure, while the sensitivity of LHV to methanation pressure ratio is high. © 2022 Published by Elsevier Ltd
  6. Keywords:
  7. Sabatier reaction ; Combustion ; Economic analysis ; Electric power generation ; Fossil fuels ; Gases ; Global warming ; Hydrogen fuels ; Hydrogen production ; Hydrogenation ; Investments ; Methanation ; Multiobjective optimization ; Natural gas ; Natural gasoline plants ; Proton exchange membrane fuel cells (PEMFC) ; Sensitivity analysis ; CO2utilization ; Gas systems ; MATIANT cycle ; Multi-objectives optimization ; Natural-gas production ; Payback periods ; Power ; Power production ; Sabaty reaction ; Synthetic natural gas ; Carbon dioxide
  8. Source: Journal of CO2 Utilization ; Volume 63 , 2022 ; 22129820 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2212982022002359