成果報告書詳細
管理番号20150000000661
タイトル平成26年度成果報告書 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業 (バイオマス) 未利用木質バイオマスの発酵熱を活用した多用途熱源の開発
公開日2016/3/1
報告書年度2014 - 2014
委託先名アスザック株式会社 株式会社東信花木 国立大学法人信州大学
プロジェクト番号P10020
部署名イノベーション推進部
和文要約件名:平成26年度成果報告書「新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業 (バイオマス) 未利用木質バイオマスの発酵熱を活用した多用途熱源の開発」

想定される実用サイズの発酵槽を2種類(16m3と24m3)試作した。発酵槽の材質は、厚さ12cmのコンクリートであり、断熱材を使用して熱伝導率1.0W/(mK)を実現した。発酵材料として、チップ加工後の3種類の状態(1,3,6ヶ月経過)のカラマツを用いた。立体的に配置した通気パイプを開閉することによって発酵の停止・再開を制御できた。発酵槽内の酸素濃度を測定して発酵温度との相関関係を明らかにした。また、チップ層の水分量測定に使用可能な水分センサーを選定し、水分量の観測を行った。融雪実験のために発酵槽内に採熱パイプを設置し、舗装路下の放熱パイプと接続して不凍液を循環させた。不凍液の流量を可変させて毎秒30ccが最適であることを突き止めた。実験室の小型発酵槽を用いて、樹種による発酵速度の違いを解明した。カラマツチップの状態によって発酵開始時間や発酵速度が左右されるため、発酵槽に入れる前に、カラマツチップの調整が必要である。そこで、チップ集積地において、カラマツチップを初期発酵させる加工工場を組み込んだビジネスモデルを検討した。
英文要約Title:Innovative Projects for Venture technology using the new energy.Innovative Projects for Venture technology using the new energy (The biomass field).Development of a general-purpose heat-source using Heat of fermentation of Wood-biomass (FY2014)Final Report

Two kinds of fermenter with the assumed practical size (16 m3 and 24 m3) were made. The wall material of the fermenters was concrete of 12cm in thick, and a thermal conductivity of the wall was reduced below 1.0 W/(m K), which is a target value at Phase A of this study, by attaching wood boards as an insulator to the concrete walls. Chips of larch at three different times elapsed after chip processing (1, 3, 6 months) were employed as the fermented biomass material. The fermenters were filled with these chips and the fermentation experiments were started. From the experiments, it was found out that fermentation could be initiated and terminated by opening and shutting the ventilation pipes which were three-dimensionally arranged in the chip layers. The oxygen concentration in the air within the chip layers was measured and it was confirmed that there was a correlation between the oxygen concentration and the temperature at the same positions. Several moisture sensors available for soil were tested to find a sensor which can be used for the chip layer. The moisture contents in the chip layer were monitored with the selected sensor during the fermentation experiment. In the snow melting experiment, pipes for heat exchange were installed in the fermenter and were connected with a heat radiation pipe under the paved road surface built for the experiment. An anti-freezing liquid was circulated through these pipes. Changing the flow rate of the anti-freezing liquid, it was found out that 30cc/s was most suitable to heat the paved road without reducing the temperature in the fermenter. The fermentation rate of the three tree species, larch, cedar and cypress was investigated by a laboratory small-scale fermenter. The timing of initiation of fermentation and the fermentation rate are influenced by the tree species and the elapsed time after processing. Therefore, before putting it in a fermenter, a pretreatment process of the chips is needed. Then, a business model including the pretreatment plant which quickly initiates fermentation of the chips at a chip accumulation site was proposed.
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