Abstract
According to the third conference of parties (COP3), Japan has set a target of reducing greenhouse gas emissions by 6% by the year 2010. One of the effective methods proposed to meet this goad is micro gas turbine cogeneration, which is increasing in popularity in industry. In the present study, the performance of a cogeneration system in cold regions and the applicability of such a system to a sewage treatment plant is investigated. The anaerobic fermentation digester produces biogas as a suitable fuel input for a cogeneration system, and the use of this waste gas provides substantial emission and environmental improvements. Analysis of biogas production indicates that production is high in the hot season, while the heat energy demand is highest in the cold season. As a method for biogas storage to adapt to the delay between peak energy supply and peak energy demand, biogas hydrate formation is examined by laboratory experiments and simulations of integration into an existing cogeneration system. It is found that hydrate storage is a cost-effective storage solution for biogas generated by sewage treatment facilities. Also, it can be suggested necessary energy for the hydrate production.
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