成果報告書詳細
管理番号20150000000128
タイトル*平成26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2015/6/25
報告書年度2014 - 2014
委託先名株式会社IHI 日立造船株式会社
プロジェクト番号P10010
部署名新エネルギー部
和文要約
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-FY2015) FY2014 Annual Report

The aim of this R&D project is to establish an effective SNG production process from woody biomass by combining dual fluidized bed gasification with a novel methanation process under atmospheric pressure.

1 Optimization of gasifier for using biomass
To extend the range of biomass which can be handled in the dual fluidized bed gasifier, pilot plant experiments have been performed with bark pellets. The results revealed lower carbon conversion and higher tar concentration when compared with white pellets. Furthermore, it was found that the total process efficiency as evaluated by ASPEN PLUS simulation using experimental data is higher than the conventional white pellets.
2 Development of highly efficient tar reformer
A new tar reformer was built for the purpose of increasing the cold gas efficiency. Results obtained in pilot plant tests showed that the concentration of heavy and light tar in the syngas can be reformed for more than 99.5%. In addition, the volume ratio of hydrogen to carbon after the reforming was relatively 30% higher than the conventional tar reformer. Therefore, it can be said that the gas composition of the new tar reformer is suitable for the methanation reaction.
3 Development of methanation process for gasified gas
The reaction conditions for methanation of various gasified gases were investigated. As a result, energy conversion efficiency for methanation increased with the volume ratio of hydrogen to carbon and lower concentration of steam. However, extremely low concentration of steam caused the carbon deposition on the catalyst. Influence of minor components in the gasified gas for catalyst durability was estimated. As a result, tar or nitrogen compounds except for sulfide don’t affect the methanation efficiency.
To evaluate operation stability in the pilot scale methanation experiment at GHSV of about 6000 h-1 and at the gas flow rate of 30 Nm3h-1 the energy conversion efficiency of about 76% to methane has been kept for over 48 h, retaining the CO conversion efficiency higher than 99%.
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