Renewable Energy, Vol.154, 863-874, 2020
Analysis of chemical-looping hydrogen production and power generation system driven by solar energy
A chemical-looping hydrogen generation technology (CLH) has considerable potential in renewable energy exploration because it can produce hydrogen and capture carbon dioxide at low energy. This study designs a novel system combining solar energy harvesting and chemical-looping hydrogen technology for hydrogen production, carbon dioxide capture, and power generation. The system is analyzed using commercial process simulation software. The effects of major factors including solar heating rate are investigated. When solar power absorbed by Fe3O4 solid particle flow is less than 132.75 kJ/mol, the yield of hydrogen and the mass fraction of the captured CO2 in the system increase with increasing solar heating rate. When solar power absorbed by Fe3O4 solid particle flow is larger than 132.75 kJ/mol, the yield of hydrogen and the mass fraction of the captured CO2 decrease with increasing solar heating rate. A set of particle energy storage equipment is added to the system to make sure stable operation given solar irradiance fluctuates. Finally, the yield coefficient X of hydrogen, H-2(molar)/CH4(molar) in the system is stabilized at 3.8, the System energy efficiency eta is stabilized at 79% and the mass fraction of captured carbon dioxide is stabilized above 93%. (C) 2020 Elsevier Ltd. All rights reserved.