This paper comprehensively analyzes characteristics and economics of systems which treat municipal refuse and utilize its contained energy as the energy source to generate not only electric energy but also the heat energy for district heating and cooling. Investigated systems are the following two: (1) System-
A which is composed of a plant to incinerate the municipal refuse and a cogeneration system with a bleeder/condensate turbine power generation unit, and (2) System-
B which is the system proposed here, and is composed of a pyrolysis furnace for treating the municipal refuse, two-stage-cleaning process for refining generated pyrolysis gas, and a cogeneration system constructed by a combined cycle power generation unit using cleaned pyrolysis gas as its fuel gas. It was estimated that the maximum net power generating efficiency of System-
B is 24.8%, and is higher by 63% compared to that of System-
A. Economics of the systems have also been investigated, and it was shown that System-
B, which is superior in the aspect of air pollution characteristics, is more economic than System-
A, if the extra electric energy of the systems can be directly supplied to various facilities, being different with the case where it should be sold only to the electric company. Effects of changes in major social and technological factors which affect the economics of the two systems are also analyzed, and it was shown that possibility is considered to be high that the economics of System-
B will become more advantageous than that of System-
A in the future.
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