成果報告書詳細
管理番号20120000000379
タイトル*平成23年度中間年報 水素製造・輸送・貯蔵システム等技術開発 水素ステーション機器要素技術に関する研究開発 都市型コンパクト水素ステーションの研究開発
公開日2013/3/25
報告書年度2011 - 2011
委託先名清水建設株式会社、岩谷産業株式会社
プロジェクト番号P08003
部署名新エネルギー部
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) 安全要素技術の適用検討
(1)-1 不活性化システム
圧縮機および蓄圧器をケースで密閉し、ケース内に不活性化ガスを充填する方式として検討した。今後は不活性化を常時とするか非常時のみとするかを実現性、運用面およびコスト面から検討する必要がある。
(1)-2 燃焼制御システム
水素の漏えいを検知した場合に、地下室内での燃焼伝播を防止することを目的とし、地下室全体にヘリウムガスおよび水噴霧を行う方式として検討した。今後はより効果的なノズル配置について検討する必要がある。
英文要約Title: Development of Technologies for Hydrogen Production, Delivery and Storage Systems.
Research and Development of Elemental Technologies for Hydrogen Station Components.
Research and Development of Compact Hydrogen Station for Urban Areas Use (FY2008-FY2012)
FY2011 Annual Report

The application of the following safety technology to compact hydrogen stations was studied.
(1) In order to inactivate the leaked gas, the compressor and accumulator are placed in the case sealed and filled with the inert gas.
(2) In order to prevent the propagation of combustion in underground room, water spray nozzles and helium gas injection ports are installed throughout the underground room.
(3) In order to reduce the blast pressure, pressure reduction plates are installed inside the ventilation tube.
The effect of reduction will be verified by numerical analysis.
The state of hydrogen diffusion at the time of leakage was studied by numerical model.
It was confirmed that even in the case of 0.2mm pinhole leakage, hydrogen density of the whole basement room was less than or equal to the lower explosive limit, provided that ventilation in compliance with CNG stand model was done.
It was also confirmed that in the case of pipe rupture, hydrogen density of the whole basement room becomes high in a few seconds.
We investigated previous experiments and numerical simulations conducted for hydrogen-air mixture explosions in enclosure room and estimated the overpressure in the underground storage room of compact hydrogen refueling station for urban areas use.
And, it was confirmed that the  overpressure at site boundaries was reduced by the blast pressure reduction system.
Quantitative evaluation method of spray density was developed to apply the system for the actual situation.
It was confirmed that the spray density was evaluated by measuring the optical strength through the spray region with the illuminometer.
The apparatus to decrease air speed to prevent the combustion enhancement by the current of air was examined. The air speed was measured by PIV measuring system. It was experimentally confirmed that the suppression of the air speed is possible by installing an enclosure near the nozzle.
It is necessary to examine the optimum shape of the enclosure next.
Considering the results of study of each safety technology, we estimated the cost of each safety system.
It was found that the vessel and piping of inert or helium gas occupies the majority of cost.
It is necessary to clarify the requirements and detailed specification of each safety system in order to streamline the system.
For installing the pressure accumulator underground, risk analysis of multiple safety protections was discussed as reference of incident cases like FMEA or Hazop.
The result of the risk analysis was improved to compare with the existing safety protections as well as the general high pressure safety standard.
The leakage detection system for hydrogen has been incorporated by the specification and development survey of the detecting and operating condition of the multiple safety protections.
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