Method and Device for Upgrading of Biogas and Hydrogen Production From Anaerobic Fermentation of Biological Material

A method for upgrading biogas from anaerobic fermentation of biological material under production of energy rich gases selected from one or more of methane (24) and hydrogen (16, 26), comprising

• in a fermentation step (50) that produces raw biogas (12), adding hydrogen gas to increase a ratio of methane:CO2 in the raw biogas (12) produced;
• desulfurizing the raw biogas;
• subjecting at least a portion of the desulfurized raw biogas to sorption enhanced reforming (70) without prior separation of CO2,
• capturing CO2 from the raw biogas and CO2 released in the reforming reaction using CaO as an absorbent,
• regenerating CaO in an endothermic reaction (80) using heat at least partially provided, directly or indirectly, by the bio-gas to be upgraded, thereby producing substantially pure hydrogen (15) and substantially pure CO2 (23).

A device for upgrading biogas from anaerobic fermentation of biological material under production of energy rich gases, selected from one or more of methane (24) and hydrogen (16), comprising:

• a digester (50),
• a device (60) for desulfurization,
• a reformer unit (70, 80),
• wherein the reforming unit (70, 80) is arranged downstream of the digester (50) and the device for desulfurization for reforming according to sorption enhanced reforming principle based on Ca-looping to provide a reforming which is inherently integrated with carbon capture and subsequent purification of the hydrogen (15) with a hydrogen purification unit (100, 100′).