title: Demand-driven biogas production by flexible feeding in full-scale - Process stability and flexibility potentials.
abstract: For future energy supply systems with high proportions from renewable energy sources, biogas plants are a promising option to supply demand-driven electricity to compensate the divergence between energy demand and energy supply by uncontrolled sources like wind and solar. Apart expanding gas storage capacity a demand-oriented feeding with the aim of flexible gas production can be an effective alternative. The presented study demonstrated a high degree of intraday flexibility (up to 50% compared to the average) and a potential for an electricity shutdown of up to 3 days (decreasing gas production by more than 60%) by flexible feeding in full-scale. Furthermore, the long-term process stability was not affected negatively due to the flexible feeding. The flexible feeding resulted in a variable rate of gas production and a dynamic progression of individual acids and the respective pH-value. In consequence, a demand-driven biogas production may enable significant savings in terms of the required gas storage volume (up to 65%) and permit far greater plant flexibility compared to constant gas production.
authors.affiliation: Department of Biochemical Conversion, DBFZ - Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, D-04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Chair of Waste Management, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany. Electronic address: eric.mauky@dbfz.de.
authors.forename: Eric
authors.initials: E
authors.lastname: Mauky
authors.affiliation: Department of Biochemical Conversion, DBFZ - Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, D-04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Chair of Waste Management, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany.
authors.forename: Sören
authors.initials: S
authors.lastname: Weinrich
authors.affiliation: Hessian State Laboratory, Fachgebiet IV.5.3 Renewable Energies, Schubertstraße 60, 35392 Gießen, Germany.
authors.forename: Hans-Fabian
authors.initials: HF
authors.lastname: Jacobi
authors.affiliation: State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, Garbenstraße 9, Stuttgart 70599, Germany.
authors.forename: Hans-Joachim
authors.initials: HJ
authors.lastname: Nägele
authors.affiliation: Department of Biochemical Conversion, DBFZ - Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, D-04347 Leipzig, Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Liebetrau
authors.affiliation: Department of Biochemical Conversion, DBFZ - Deutsches Biomasseforschungszentrum gemeinnützige GmbH, Torgauer Straße 116, D-04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, Chair of Waste Management, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Nelles
mesh_terms: D000143:Acids; D056804:Biofuels; D019149:Bioreactors; D002245:Carbon Dioxide; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D014866:Waste Products
chemical_list: D000143:Acids; D056804:Biofuels; D014866:Waste Products; D002245:Carbon Dioxide
keywords: Balancing power; Bioenergy; Demand-oriented feeding; Gas storage; Monitoring; Sugar beet silage