Abstract
Chemical looping combustion (CLC) is a promising carbon capture technology allowing integration with high‐efficiency Brayton cycles for energy production and yielding a concentrated CO2 stream without requiring air separation units. Recently, dynamically operated fixed bed reactors have been proposed and investigated for CLC. This study deals with the technoeconomic assessment of a CLC process performed in packed beds. Following a previously published work on the topic, two different configurations are considered: one relying on a single oxygen carrier (Cu/CuO based) and the other on two in–series oxygen carriers (Cu/CuO based first, Ni/NiO based later). For both configurations, relevant process schemes are devised to obtain continuous power generation. Despite slightly larger capital costs, two‐stage CLC performs better in terms of efficiency, levelized cost of electricity, and avoided CO2 costs. Fuel price and high–temperature valves costs are identified as the main variables influencing the economic performance. The use of two in–parallel packed bed reactors (2.0 m length, 0.7 m internal diameter) enables a power output of 386 kWe, a net electric efficiency of 37.2%, a levelized cost of electricity of 91 € MWhe −1, and avoided CO2 costs of 55 € tonCO2 −1 with respect to a reference pulverized coal power plant.
Highlights
Introduction tion unitIt allows integration with high-efficiency Brayton cycles for energy production
Despite the progress in utilization and integration of renewable energies, carbon capture and utilization/storage contacted by means of an intermediate solid compound, so-called oxygen carrier (OC), and the combustion process is split in a twostep process.[4,5,6]
Compression of the air stream required for both the HROS and OS is by far the most energy intensive process, accounting for about 50–66% of the energy produced
Summary
It allows integration with high-efficiency Brayton cycles for energy production. Emissions of CO2 have largely increased in the last decades due to anthropogenic activities, with cement and energy production being two major CO2 emitting industries. Despite the progress in utilization and integration of renewable energies, carbon capture and utilization/storage contacted by means of an intermediate solid compound, so-called oxygen carrier (OC), and the combustion process is split in a twostep process.[4,5,6] The OC is a metal oxide compound made of an active phase able to reversibly exchange oxygen (e.g., Cu/CuO, Ni/NiO, Fe2O3/Fe3O4/FeO), supported on an inert material (e.g., Al2O3, ZrO2) required to improve the mechanical and chemical–physical properties (e.g., porosity, kinetics) of the solid particles.[7,8] In the first stage of CLC, the OC reacts with the fuel by
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have