Analyses of Life Cycle Inventory and Business Potential of the BLUE Tower Process Energy System Using Waste Mushroom Bed Materials

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  • えのき廃菌床を用いたバイオマスエネルギープラントに関するLCA・事業性評価
  • エノキ ハイキンショウ オ モチイタ バイオマス エネルギー プラント ニ カンスル LCA ジギョウセイ ヒョウカ

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Abstract

Since the enactment of the Kyoto Protocol, renewable energy technologies have been an attractive subject in Japan. Especially, technologies related to biomass resource use are promising as waste materials in local areas can be reduced or recycled, and the system can turn a profit. In this paper, we describe the biomass energy systems of a cogeneration system (CGS) and a bio-hydrogen production system (Bio-H_2) that effectively uses the waste material of a mushroom bed from the viewpoints of CO_2 emission mitigation and business potential. CO_2 emission mitigation was estimated using Life Cycle Assessment (LCA) methodology. Additionally, the moisture content of the biomass materials and/or the transportation distance were considered applying the Monte Carlo simulation. In the case of a processing fee of 15,000yen/t and a subsidy rate of 50%, CO_2 emissions and energy costs were as follows: CO_2 emissions and the power price through CGS were 20.3 to 34.2g-CO_2/MJ and 11.5 to 16.8yen/kWh. On the other hand, in the case of the Bio-H_2 production system, they were 31.9 to 45.8g-CO_2/MJ and 61 to 81yen/Nm^3.

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