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Recent progress on process integration of the Ca-Cu technology for decarbonization of ammonia, iron and steel and hydrogen industries

AuthorsMartínez Berges, Isabel; Riva, Leonardo; Fernández García, José Ramón ; Martini, Michela; Abanades García, Juan Carlos ; Gallucci, Fausto; Sint Annaland, Martin van; Romano, M. C.
KeywordsCO2 capture
Fixed bed reactor
Hydrogen production
Ca-Cu looping process
Ammonia synthesis
Sorption enhanced water gas shift
Issue Date22-Oct-2018
Citationghgt-14 (2018)
AbstractThe production of hydrogen via natural gas reforming or water gas shift in the presence of a CaO-based material has received great attention over a long period due to its great potential in terms of energy efficiency and CO2 capture efficiency compared to other low-carbon emission hydrogen production processes. The regeneration of the CaCO3 formed during the hydrogen production step by means of a second redox loop of Cu/CuO was proposed almost a decade ago in order to boost the efficiency of the process, while avoiding the highly energy-demanding oxygen-fired regeneration step. Since then, this Ca-Cu process has noticeably progressed [1], being recently demonstrated at TRL4 under the FP7 project ASCENT [2]. Hydrogen production in a series of fixed bed reactors is the Ca-Cu process configuration that has been mostly assessed due to its inherent advantage of allowing pressure swing between the high pressure sorption enhanced reforming stage for hydrogen production and the low pressure CaCO3 regeneration step. A further advantage of integration of the Ca-Cu technology in hydrogen plants compared to power generation is that carbon-rich PSA off-gases can be used in the sorbent regeneration step leading to virtually zero-emission plants. Different fixed bed reactors configurations, operating conditions and fuel properties have been widely studied in the literature making use of reactor models with different levels of complexity [3-6]. Hydrogen production efficiencies that are noticeably higher than those obtained with commercial steam reformers have been demonstrated for this Ca-Cu process (i.e. 7-8%points), even when accounting for the electricity consumption associated with the production of a rich-CO2 stream ready for compression and storage [4].
Description2 figures.-- Talk delivered at the 14th International Conference on Greenhouse Gas Control Technologies, 21st–25th October 2018, Melbourne (Australia).
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(ICB) Comunicaciones congresos
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