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The use of a calcium looping cycle for the production of hydrogen (Ca-LHP) from biomass gasification syngas is a promising alternative to the conventionally used catalytic water−gas shift process. The process takes place in two fluidized bed reactors connected by solid CaO flow. In the first reactor (the carbonator), the water−gas shift reaction is enhanced by CO 2 capture via the carbonation reaction with CaO. In the second reactor (the regenerator), the captured CO 2 is released. This paper presents results from a continuously operated 20 kW th dual fluidized-bed facility using a syngas-like mixture obtained from biomass gasification. The influence of the main process parameters, i.e., temperature in the carbonator (T carb ), looping ratio (LR), and space time (τ) on the H 2 concentration, and the CO conversion in the carbonator was investigated. A H 2 concentration of 84.4 vol % dry and a CO conversion of 76.4% were achieved for a carbonator temperature of 639°C, a looping ratio of 6 mol Ca /mol CO+CO 2 , and a space time of 1.0 h. Additionally, experiments with different syngas compositions as obtained from various biomass fluidized bed gasification processes were performed and the mechanical stability as well as the chemical sorbent activity were studied. The potential of the calcium looping cycle for H 2 production could be shown by the experimental results obtained and their comparison with literature.

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Der vorliegende Beitrag stellt Arbeiten vor, die im Rahmen der dreijährigen Helmholtz‐Energieallianz Synthetische flüssige Kohlenwasserstoffe (SynKWS) – Speicher mit höchster Energiedichte durchgeführt wurden. Unter Einbezug technischer, prozessoptimierender und systemanalytischer Aspekte wurden ausgewählte Pfade für die Erzeugung von flüssigen, synthetischen Kohlenwasserstoffen aus erneuerbaren Energien und Biomassen untersucht und bewertet. Ergänzend erfolgte eine systemanalytische Bewertung synthetischer flüssiger Kohlenwasserstoffe in einem Energiesystem der Zukunft mit hohem Anteil erneuerbarer Energien.

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