Coal and biomass combustion with CO2 capture by CLOU process using a magnetic Fe-Mn-supported CuO oxygen carrier

•Combustion of some coals and biomasses was carried out in a 1.5 kWth CLOU unit.•Magnetic Cu-based oxygen carrier prepared by spray granulation was used.•Complete combustion to CO2 and H2O in the fuel reactor was achieved with all fuels.•CO2 capture efficiency increased with temperature reaching val...

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Bibliographic Details
Published in:Fuel (Guildford) 2022-04, Vol.314, p.122742, Article 122742
Main Authors: Adánez-Rubio, Iñaki, Samprón, Iván, Izquierdo, María Teresa, Abad, Alberto, Gayán, Pilar, Adánez, Juan
Format: Article
Language:English
Subjects:
Ash
Ashes
Biomass
Biomass burning
Burning
Carbon dioxide
Carbon sequestration
Chemical looping combustion
CLOU
CO2 capture
Coal
Combustion
Efficiency
Elutriation
Fluidized bed combustion
Magnetic properties
Manganese
Nuclear fuels
Oxygen
Sawdust
Separation
Solid fuels
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Summary:•Combustion of some coals and biomasses was carried out in a 1.5 kWth CLOU unit.•Magnetic Cu-based oxygen carrier prepared by spray granulation was used.•Complete combustion to CO2 and H2O in the fuel reactor was achieved with all fuels.•CO2 capture efficiency increased with temperature reaching values of 93–97% at 900 °C.•Separation of the oxygen carrier from ashes gives efficiencies higher than 98 % The Chemical Looping with Oxygen Uncoupling (CLOU) process is a derivative technology of the Chemical Looping Combustion (CLC) process for the combustion of both renewable and non-renewable solid fuels. The present work studies the combustion and CO2 capture efficiency of burning coal or biomass using a single Cu-based oxygen carrier with magnetic properties as an oxygen carrier. The combustion of two different coals and three different biomasses was performed in a 1.5 kWth CLOU continuously operated unit for 36 h. The magnetic properties of the oxygen carrier were also studied after combustion and its separation from the ashes. Complete combustion of the fuel to CO2 and H2O was achieved in all cases. For both coals, CO2 capture efficiency increased with fuel reactor temperature, with both reaching values of 97% at 900 °C. The same increase was obtained with the biomasses. The highest CO2 capture efficiency for a biomass was obtained with pine sawdust, which achieved a value of 93%, followed by almond shell (86%) and olive stone (80%) at 900 °C. Oxygen carrier reactivity remained constant after use in the continuous unit with one small increase in the attrition jet index (AJI) value. The used particles were found to still be as magnetic as the fresh particles, and the fines were also highly magnetic. Values higher than 99% were achieved with separation from the fines reached. It was therefore proven that the elutriated oxygen carrier from the plant was still magnetic and could be easily separated from the elutriated ash.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.122742