Yoshiya Terao Fluid Flow Div. NMIJ Research projects at NMIJ on hydrogen flow and wet steam flow measurement Yoshiya Terao Fluid Flow Div. NMIJ

Hydrogen： low pressure to high pressure 0.5 MPa → 70 MPa NMIJ 70 MPa 0.5 MPa Critical nozzle for high pressure Eight Critical Nozzles 経済産業省HP　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　「燃料電池自動車1,100km長距離走行実証レポート」より 等エントロピー変化で　　　　70 K程度　　　　　　　　　　　　液化は20 K程度 H2 Dispenser FCV Primary Standard CVN Flowmeter Pressure control valves H2 Station Multi nozzle system

Hydrogen： low pressure to high pressure 0.5 MPa → 70 MPa Automatic Pressure Control Valve 100 MPa Pressure gauge Multi nozzle system H2 (0.5 MPa) 　H2 　　　　　　(70 MPa) CVN (φ0.6 mm) CVN Flowmeter Standard Uncert.：0.6 % Reproducibility：±0.3 % Standard Uncert.：0.2 % Max.700 g/min@0.55 MPa

Hydrogen：low pressure (0.5 MPa) Multi Nozzle System　（0.5 MPa) CVN x 8 (φ2.4 mm) Standard Uncert.：0.2 % 0.5 MPa max.700 g/min

Hydrogen： low pressure to high pressure 0.5 MPa → 70 MPa NMIJ 70 MPa 0.5 MPa Critical nozzle for high pressure Eight Critical Nozzles 経済産業省HP　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　「燃料電池自動車1,100km長距離走行実証レポート」より 等エントロピー変化で　　　　70 K程度　　　　　　　　　　　　液化は20 K程度 H2 Dispenser FCV Primary Standard CVN Flowmeter Pressure control valves H2 Station Multi nozzle system

Wet Steam Flow Dry Steam Wet Steam 10%？ 20%？ Hot and pressurized steam used for energy source for various plans, district heating, etc. Supplier Customer Boiler heat reheater Dryer Pipe line Dry Steam Wet Steam No need for compensated water Supplier send larger amount of steam than customers need. 10%？　20%？

Wet Steam is mixture of gas and liquid (mostly gas) Gas flowmeter is used to measure wet steam flow Affected by liquid composition (water droplets) Gas flowmeter Qgas Qliquid Outpur＝Qgas＋Error Need for compansation (Over Reading) 10 ~ 20 %  1 ~ 2 %

Wet Steam Flow Calibration Facility Total mass flowrate Boiler Water Coriolis meter 20 ~ 30 °C Saturated Steam Water Dryer Condenser Dry Steam Wet Steam with known wetness Wet Steam Q Heat exchanger Meter under test DT Removed enthalpy is calculated from DT と Q　 Coolant

Wet Steam Flow Calibration Facility Calibrated by NMIJ Max flowrate: 800 kg/s Dry steam Wet steam Installed at TEPCO

Wet Steam Flow Calibration Facility max.Q 830 kg/h max.P 1.6 MPa max.T 500 K Wetness= Dry ~ 15 % Joint research: TEPCO and NMIJ

Dry Steam Flow single phase Calibration results with dry steam and air dry steam (~150 °C) vs. air(~25 °C) 気体中流量校正設備 agreed within ±1%

Wet Steam Flow measurement with Orifice Total flowrate Gas flowrate Over-Reading

Wet Steam Flow More data for; Orifice Vortex flowmeter Ultrasonic flowmeter ・・・ Then to ISO standard…… Thank you for your attention.