System appraisal of decentralized utilization of biogas versus feed into natural gas networks - an evaluation of methods for biogas preparation and feeding

摘要

Feeding of biogas into natural gas distribution networks is an option for expanding the use of regenerable energy sources. In view of the still experimental character of biogas preparation, in particular, a concluding evaluation on energy and process-engineering criteria remains to be submitted. This article describes the various methods of biogas preparation using process-engineering simulations. The mass-flows and energy-flows and methane losses in the individual processes are examined and the specific advantages and disadvantages of the various procedures derived. The article concludes with a comparative assessment of biogas feeding and decentralized biogas-fueled power generation on the basis of an efficiency and cost model.