Proposal and Comprehensive Evaluation of New Systems for Treating and Utilizing Municipal Refuse

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  • 新しい都市ごみ処理利用システムの提案とその総合的評価
  • アタラシイ トシ ゴミ ショリ リヨウ システム ノ テイアン ト ソノ ソウ

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Abstract

This paper proposes three new total systems which treat municipal refuse by pyrolysis and highly refine the generated pyrolysis gas and then use it as the fuel of a cogeneration system for district heating and cooling. The characteristics of the proposed systems were also evaluated comprehensively. As the result of evaluation, a cogeneration system is recommended which is constructed by a combined cycle power generation system with two gas turbines and a bleeder/condensate steam turbine. In the recommended system, two mass-produced conventional gas turbines are partially modified so as to make it possible to utilize the refuse-recovered low calorific gas as its fuel. It has high power generating characteristics, and is economically superior compared with a conventinal sytem, which is constructed by a garbage incinerating furnace and bleeder/condensate steam turbine power generation unit, if the extra electric energy of the system can be sold to various municipal facilities. It was also revealed from the simulation results that in the recommended system the average exergetic efficiency is 1.59 times higher, and the amount of NOx and CO2 emission is 71% and 41% less, respectively, compared with the conventional system.

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