成果報告書詳細
管理番号20100000002300
タイトル*平成21年度中間年報 新エネルギー技術研究開発/新エネルギーベンチャー技術革新事業(バイオマス)/精製バイオガスの高効率輸送と導管供給に向けた技術開発
公開日2011/11/26
報告書年度2009 - 2009
委託先名吸着技術工業株式会社 山鹿都市ガス株式会社 株式会社日本総合研究所
プロジェクト番号P10020
部署名研究開発推進部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 (1)事業概要 本事業は、バイオガス発生源でメタンを回収、精製、貯蔵し、需要家への精製バイオガスの供給事業の立ち上げを目標とする。そのため、吸着技術工業(株)、山鹿都市ガス(株)、(株)日本総合研究所の異業種連携チームによる事業を実施し、吸蔵容器を用いた高効率な精製バイオガスの輸送技術の開発、一般家庭での精製バイオガスの利用方法の開発、導管供給に向けた供給システムの開発を行う。
本事業では、吸着技術工業(株)は独自のメタン吸着剤を用いて、大吸蔵量、省エネルギー、低コスト、コンパクトなメタン吸蔵容器を開発する。本開発技術の特長としては、(1)独自の高性能メタン吸着剤を使用し、メタンガスを高密度に吸着剤細孔内に吸着させる、(2)低温吸着により、低圧条件下で大吸蔵量を確保できる、(3)メタンを充填する際の吸着熱を循環ガスによって系外に放出して、効率的にメタンを吸着する、(4)低圧(1 MPa 未満)での吸蔵により、高圧ガス保安法の適用を受けず、有資格者が不要。圧縮の消費電力も低減し、低コスト化ができる。
英文要約The rate of biogas utilization is less than 30 % of the total biogas production in Japan because of the delay in the development of an effective methane gas storage and transportation technology. In this work, we try to develop an effective adsorption storage technology for purified methane from biogas. We report here a new methane adsorption storage technology at low temperatures and low pressures. A high-performance activated carbon methane adsorbent, on which the adsorption amount of methane is over 80 m3N/m3, has been developed by us. A Vacuum Pressure Swing Adsorption (VPSA) biogas purification equipment with a throughput of 5 m3N/h was manufactured. Carbon dioxide, hydrogen sulfide, oxygen and nitrogen get adsorbed on to the surface of the adsorbent. The gas that exits from the top of the adsorption vessel has around 95 vol% of methane with recovery rate over 90 %. A 1 m3 prototype storage cylinder was made to which the high-performance methane adsorbent was packed. The VPSA-methane purification equipment and methane storage cylinder were integrated and loaded on a 3 ton truck. The equipment was used for biogas storage verification test in the Biomass Center of Yamaga City, Kumamoto prefecture. During gas charging process, the heated methane gas by adsorption heat was allowed to flow continuously through the outlet of the storage cylinder after the cylinder pressure reached the expected value. In this way adsorption heat is emitted to the out of the storage cylinder. As a result, the thermal effect on charging gas is decreased and methane gas could be charged to the storage cylinder with an expected capacity. The storage capacity reached 80 m3N-methane/m3-adsorbent at a pressure lower than 1 MPa at 243 K. The verification test was carried out for longer than 1 month with repeating charging-discharging upgraded biogas. A stable performance for both VPSA-methane and methane storage cylinder was observed. The purified biogas was also transported to premises of Yamaga Toshi Gas, which is about 5 km far from the Biomass Center, to be used for a model pipeline supply experiment. Combustion experiments of biogas from the pipeline were carried out using general household combustion appliances such as gas cooking stoves, water boilers, fan heaters, infrared space-heaters etc.. Good and stable combustion appearances were observed for all of combustion appliances mentioned above. No hazardous substance was detected from the exhaust gas. It is shown that the storage cylinder developed in this work is featured by compact, low running and initial cost. Also, the vehicle-installed equipment is expected for promising practical applications.
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