成果報告書詳細
管理番号20140000000197
タイトル*平成25年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素ステーション用低コスト機器・システム等に関する研究開発 水素ステーションにおける水素計量管理方法に関する研究開発
公開日2015/3/24
報告書年度2013 - 2013
委託先名水素供給・利用技術研究組合 株式会社タツノ 独立行政法人産業技術総合研究所 岩谷産業株式会社
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title1: Research and Development of Technology for Hydrogen Utilization
Title2: Research and Development for Low Cost Facilities and Systems for FCV and Hydrogen Infrastructure
Title3: Research and Development of Hydrogen Accountancy in HRSs (FY2013-FY2015) FY2013 Annual Report

(1) Development of Hydrogen Accountancy Guideline
We enacted 1st draft of hydrogen accountancy guideline especially from the points of view hydrogen meter and dispenser facilities, not hydrogen meter only. This draft will be the base of the private guideline, not public. Also, we examined hydrogen de-pressure loss volume in HRSs, because this volume is error for hydrogen meter.

(2) Establishment of the evaluation method by the weighting method at HRS
It is aimed for the hydrogen measurement management in the hydrogen refueling station. We designed the measuring and checking system of the hydrogen gas dispenser by the weighting method.

To perform a safe measurement, a highly precise measurement, we designed a constitution apparatus and examined a procedure of the weight method measurement procedure.
The design policies are as follows.

1) We aimed at the condition same as the filling to the fuel cell-powered car in the hydrogen station. We used an automotive filling container, and adopted a large-diameter bending pipe to lower a pressure loss.
2) We used high-strength lightweight materials for the plumbing and the flowmeter flow tube, so a safe measurement and a highly precise measurement are possible.
3) We use automotive lightweight Type3 composition container, for high precision measurement.
4) We obey the high-pressure gas-related law of Japan.
5) We take enough safely measures, and we use explosion-proof device.

(3) Research and development of metrological control techniques at HRS
The critical nozzles are used as a metrological control technique traceable to the national standard in the present project. The characteristics of critical nozzles (throat diameter: 2.4mm) were investigated by using the primary standard for gas flow rate in the Reynolds number range between 15,000 and 120,000. The discharge coefficients of these critical nozzles increased with the Reynolds number increase. The discharge coefficients of critical nozzle (throat diameter: 0.7mm) were investigated at 35MPa high-pressure hydrogen. The Reynolds number range was between 250,000 and 1,600,000. The tendency of the discharge coefficients was reverse to the results at the low Reynolds number, and decreased with the Reynolds number increase. This may be caused by a high-pressure real gas effects, but has not yet led to any conclusion. The present project will perform the uncertainty evaluation of the multi-nozzle calibrator and optimization of the critical nozzles, as future investigation.

(5)-1 Research & development of high-pressure hydrogen characteristics for CFD design of hydrogen nozzle
In the present study, the measurement of the PVT property of hydrogen has been performed by a magnetic suspension densimeter at pressures up to 100 MPa with an uncertainty below 0.1%. For the CFD analysis at the nozzle, the developed hydrogen thermo-physical properties database has been modified to enhance the calculation performance.

(5)-2 Research & development of CFD simulation for hydrogen nozzle
The CFD code that can predict discharge coefficient in the range from low to high Reynolds number accurately was developed. Relationship between Reynolds number and critical back pressure ratio including speed of sound in the range of high pressure, and the effect of nozzle geometry and back pressure on discharge coefficient and so on are planning to be investigated by CFD simulation.
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