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

2. 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

3. Hydrogen： low pressure to high pressure 0.5 MPa → 70 MPa
Automatic Pressure Control Valve
100 MPa Pressure gauge
Multi nozzle system
H (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 MPa

4. 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

5. 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

6. 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%？

7. 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 %

8. 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

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

10. 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

11. 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%

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

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