Biogas Installation for Production of Biogas from Biomass, and Methods for Operation of the Biogas Installation

摘要

A biogas installation for production of biogas from biomass and methods for starting and shutting down a fermenter are disclosed. When biomass in a fermenter is used up, biogas production must stop, the fermented biomass removed, and the fermenter filled with fresh biomass. Biogas production and utilisation is maintained for as long as possible. When the methane concentration in the biogas outlet falls below an upper limit, the biogas line is disconnected. The biogas/off-gas mixture is fed out via an exhaust chimney until the methane concentration has fallen to a lower limit. The fermenter to be shut down is purged with fresh air, and the off-gas/biogas/fresh air mixture is fed out via the exhaust chimney until the carbon-dioxide concentration in the off-gas/biogas/fresh air mixture has fallen to a first limit. The fermenter is then opened to unload the consumed biomass and load fresh biomass.