成果報告書詳細
管理番号20130000000507
タイトル*平成24年度中間年報 バイオマスエネルギー技術研究開発 戦略的次世代バイオマスエネルギー利用技術開発事業(実用化技術開発) 木質バイオマスのガス化によるSNG製造技術の研究開発
公開日2013/6/25
報告書年度2012 - 2012
委託先名株式会社IHI アタカ大機株式会社
プロジェクト番号P10010
部署名新エネルギー部
和文要約本プロジェクトでは、高濃度のガス化ガスが得られる二塔式ガス化炉と、常圧で高い転換率が達成可能なメタネーション触媒プロセスを組み合わせ、木質バイオマスのガス化により高効率に合成天然ガス(SNG)を製造する技術を開発する。具体的には、二塔式ガス化炉の最適化、タール改質炉の開発、メタネーションプロセスの開発を行う。
英文要約Title: Project to Develop Next-generation Technology for Strategic Utilization of Biomass Energy, SNG Production from Woody biomass Using Gasification Process (FY2012-FY2013) FY2012 Annual Report

This R&D project is being undertaken to establish a highly efficient process for SNG production from woody biomass by combining dual fluidized bed gasification with a novel methanation process under normal pressure. The R&D items include optimization of a dual fluidized bed gasifier, development of a highly efficient tar reformer and development of a methanation process for gasified gas.
1 Optimization of gasifier for using biomass
A cold gas efficiency of more than 75% has been achieved in a bench scale gasifier for a S/C (steam to carbon ratio) of 1.0. Based on information obtained from the bench scale experiments, conditions have been sought to realize a total process efficiency exceeding 75% by using ASPEN PLUS. For optimization of the plant size, we evaluated the possibility of downsizing gasifier volume and combustor height.
2 Development of highly efficient tar reformer
The concentration of heavy and light tar contained in syngas of bench scale gasifier could be reduced by more than 99% with an electric tar reformer. In addition, we sought the suitable temperature distribution in the reformer for achievement of high tar reforming efficiency by using FLUENT and non-dimensional simulation with detailed tar chemistry.
3 Development of methanation process for gasified gas
CO conversion above 99% and methanation efficiency of more than 70% was accomplished in the lab scale experiment by using simulated gas. It has been found that the H2S concentration must be kept below several hundred ppb to ensure an endurance of no less than 7000h for the methanation catalyst. In addition, IHI Corporation and Daiki Ataka Engineering Co.,Ltd.have jointly conducted a series of methanation experiments by using bench scale gasifier. As a result, same targets as in the lab scale experiments could be achieved. In order to separate CH4 from syngas after methanation reactor, we surveyed separation technology using membranes. A relationship between CH4 concentration and recovery rate has been found. In addition, we estimated running costs as function of biomass cost and methane price.
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