Since a micro gas turbine (MGT) generally has higher heat/electric ratio to the other prime movers in cogeneration system (CGS), it is much available at a sewage treatment plant of cold district where large amount of heat is usually required in a year. However, it sometimes gives lower generating efficiency, especially in summer, because of higher intake air density. As another problem it is difficult to keep higher level of generating efficiency on partial loads of MGT operation. On the other hand CGS with fuel cells commonly shows the higher efficiency and is significantly expected to improve the total energy performance in the system without those defections. In this study, several models with cooperative usage of MGT and PAFC are analytically proposed for a sewage treatment plant of cold district. As the result of the calculation CGS operation properly mixed with MGT and FC can produce both much generation capacity and more effective use of biogas in the plant.
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