成果報告書詳細
管理番号20140000000129
タイトル*平成25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(次世代技術開発) 下水汚泥からの革新的な高純度水素直接製造プロセスの研究開発
公開日2014/5/2
報告書年度2013 - 2013
委託先名国立大学法人東北大学 株式会社大和三光製作所
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: Research and development of novel process to directly produce high-purity hydrogen from sewage sludge (FY2013-FY2014)FY2013 Annual report

We had proposed a new approach to produce hydrogen from biomass based on a solid state reaction between biomass and hydroxide additives at relatively low temperature below 600 degrees. This approach has been found to be applicable to other materials, such as biomass waste of sludge. Sewage sludge has been chosen as target sample because that it is already available in accumulation and not yet developed as resources for other purposes. This research covers optimization of additives, reaction mechanism identification, design and manufacture of continuous system, clarification of operation parameters as well as factors for scale-up.
It is known by laboratory experiment that hydrogen generation occurs with heating the mixed sample of sewage sludge with additives of hydroxides of nickel and calcium. TG-MS analysis has shown clearly that hydrogen generation occurs around 400~600 degrees from the ground mixture of sewage sludge and additives. Detailed experiments with various added amounts of both hydroxides have been conducted and hydrogen yields have been obtained. It is interesting to note that, with dried sewage sludge sample, at less addition of nickel hydroxide, hydrogen yield increases with the less addition of calcium hydroxide. It is suggested it is possible to produce hydrogen at relatively low cost by decreasing addition of both hydroxides. However, with raw sample of sludge without drying, similar phenomena have not been observed and more addition of calcium is needed for higher yield of hydrogen. The reason for such difference may be due to the powder mixing state and has being investigated in detail.
XRD analyses have shown the formation of calcium carbonate from the added hydroxide as well as nickel oxide and nickel metal from the added hydroxide in the solid residues after heating for hydrogen generation. Together with the gaseous compositions of hydrogen and carbon dioxide, reaction mechanism has been discussed based on the reaction between part of organic and hydroxide or water.
At the same time, design and manufacture of heating furnace and continuous system for scale-up test has been finished and plant test will be conducted as planned. Cost evaluation is also under operation.
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