成果報告書詳細
管理番号20120000000275
タイトル*平成23年度中間年報 水素先端科学基礎研究事業 水素先端科学基礎研究 (2)
公開日2013/3/20
報告書年度2011 - 2011
委託先名国立大学法人佐賀大学
プロジェクト番号P06026
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:「水素雰囲気における高沸点ガスの露点の測定」
燃料電池車用の水素ステーションにおいて,車載タンクへの高圧水素の急速充填時に,水素中に残存する微量高沸点ガス(水蒸気等)が系内の低温部において凝縮・凝固し,配管の閉塞や流動系の不安定の原因となることが懸念されている.
英文要約Title:Fundamental Research Project on Advanced Hydrogen Science (FY2006-2012) FY2011 Annual Report (2)Dew point measurements of high boiling point residual gases in high pressure hydrogen (Saga University)
[Summary]
In hydrogen filling stations for fuel cell vehicles, occurrences of occlusions of pipes or instabilities of flow systems due to condensation/solidification of residual water in high pressure hydrogen gases under rapid hydrogen filling to tanks on vehicles are matters in concern. Systematic and reliable frost point data concerning operating conditions of actual hydrogen stations were strongly required for understanding optimal design and operational conditions of stations.
In 2011 fiscal year, systematical measurements on H2+H2O standard gases with total pressure up to 10 MPa, water concentration 5-50 ppm were carried out utilizing the developed dew and frost point measurement system for H2+H2O systems, and the developed frost point estimation procedure for H2+H2O systems based on the Peng-Robinson equation of state (van der Waals type) was improved applying the Lee-Kesler-Plocker equation of state (virial type).
The optimal interaction parameters in two equations of states for frost point data obtained by the present measurement system with high pressure test cell utilizing cooled mirror technique with original image analysis were calculated under conditions of total pressure 5~10 MPa, water concentration 5~50 ppm. Those values were similar in numbers of the optimal parameters for frost point data by the embedded dew point sensor for verification. The response time of the embedded dew point sensor for verification became extremely longer and its stabilities of signals were degraded under low water concentration conditions below about 10 ppm, in contrast, the cell system with image analysis had short response time even in low water concentration conditions.
At present, we recommended frost point estimation procedure based on the PR-EOS with small value of interaction parameter kij for H2+H2O systems due to results of measurements and extended estimation for higher pressure. We also judged that water concentration of 5 ppm is excessive level and it will not be acceptable in actual hydrogen stations.
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