Dalin Zhang, Amirhamzeh Farajollahi, Ali Basem, H. Shami, Khursheed Muzammil, Saiful Islam, Rahadian Zainul
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. © 2024 Elsevier Ltd
School of Mathematics and Statistics, Qiannan Normal University for Nationalities, Guizhou, Duyun, 558000, China; Key Laboratory of Complex Systems and Intelligent Optimization of Guizhou Province, Duyun, Guizhou, 558000, China; Department of Engineering, Imam Ali University, Tehran, Iran; Faculty of Engineering, Warith Al-Anbiyaa University, Karbala, 56001, Iraq; Department of Dentistry, College of Dentistry, The Islamic University, Najaf, Iraq; Department of Medical Analysis, Medical laboratory Technique College, The Islamic University of Al Diwaniyah, Al Diwaniyah, Iraq; Department of Public Health, College of Applied Medical Sciences, Khamis Mushait Campus, King Khalid University, Abha, 62561, Saudi Arabia; Civil Engineering Department, College of Engineering, King Khalid University, Abha, 61421, Saudi Arabia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Indonesia; Center for Advanced Material Processing, Artificial Intelligence, and Biophysics Informatics (CAMPBIOTICS), Universitas Negeri Padang, Indonesia; INTI International University, Negeri Sembilan, Nilai, 71800, Malaysia; Superior University, Lahore, Pakistan
