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3-E analysis of a hybrid multigeneration carbon-free process based on the integration of Allam-Z cycle and CO2 electroreduction cell

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  • Zhang, Dalin
  • Farajollahi, Amirhamzeh
  • Basem, Ali
  • Shami, H.
  • Muzammil, Khursheed
  • Islam, Saiful
  • Zainul, Rahadian

Abstract

A modified version of the Allam cycle, known as the Allam-Z cycle, was proposed and studied. This modified cycle features a simplified system that utilizes a working medium composed of natural gas/Oxygen combustion products mixed with circulating CO2 for power generation. The aim is to achieve high efficiency, zero CO2 emissions, and facilitate peak load shifting. Notable modifications include pumping all working media to high pressure using pumps instead of compressors, utilizing the cold energy from both liquid oxygen and LNG to cool water for CO2 liquefaction, and incorporating a set of regenerative heat exchangers for turbine exhaust heat recovery. Furthermore, a fraction of the outlet CO2 is directed to a CO2 electroreduction cell for conversion into methane. A portion of the produced methane is then reintroduced into the supercritical CO2 cycle, while the remaining methane is stored. Subsequently, a comprehensive 3-E analysis was conducted to investigate the modeled process. Based on the results, the energy efficiency, exergy efficiency, and total cost rate of the simulated process are 41.22 %, 57 %, and 326.86 $/h, respectively.

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  • Zhang, Dalin & Farajollahi, Amirhamzeh & Basem, Ali & Shami, H. & Muzammil, Khursheed & Islam, Saiful & Zainul, Rahadian, 2025. "3-E analysis of a hybrid multigeneration carbon-free process based on the integration of Allam-Z cycle and CO2 electroreduction cell," Renewable Energy, Elsevier, vol. 241(C).
    • Handle: RePEc:eee:renene:v:241:y:2025:i:c:s096014812402305x
    DOI: 10.1016/j.renene.2024.122237
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