TM Ultrasonic Air Mass Flow Rate Measurement for Industrial Gas Turbines (Siemens, Alstom, GE, Mitsubishi) Specifications Air Speed Range 0 to 200 ft/s (0 to 60 m/s) Sound Path Length 1 - 20 ft (30 cm to 6 m) Air Temperature Range -22 to 176 °F (-30 to 70 °C) Air Pressure Range 12 to 16 psia (800 to 1100 mbar) Relative Humidity Range 0 to 100% Evaporative cooling – yes Inlet chilling below dew point - yes Inlet fogging - yes Update Interval < 0.5 s for typical gas turbine inlet duct dimensions Accuracy of Calculated Values Air speed systematic uncertainty (2σ) typically less than 0.5% of reading at nominal maximum air speed Air mass flow rate systematic uncertainty (2σ) typically less than 1.0% of reading at nominal maximum mass flow rate Accuracy of Base Measurements Probe tip coordinates and duct dimensions determined from 3D laser survey with 0.04” (1 mm) accuracy 107502.1 Specifications for AirSonic System Page 1 of 6
6
Embed
· Web viewExample Locations For Gas Turbine Ducts Rectangular Siemens 501G Mitsubishi 501G Inlet Duct Probe Locations GE 7FA Author Robbie Created Date 07/23/2014 12:20:00 Last
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
TM
Ultrasonic Air Mass Flow Rate Measurement for Industrial Gas Turbines (Siemens, Alstom, GE, Mitsubishi) Specifications
Air Speed Range 0 to 200 ft/s (0 to 60 m/s)
Sound Path Length 1 - 20 ft (30 cm to 6 m)
Air Temperature Range -22 to 176 °F (-30 to 70 °C)
Air Pressure Range 12 to 16 psia (800 to 1100 mbar)
Relative Humidity Range 0 to 100% Evaporative cooling – yes Inlet chilling below dew point - yes Inlet fogging - yes
Update Interval < 0.5 s for typical gas turbine inlet
duct dimensions
Accuracy of Calculated Values Air speed systematic uncertainty (2σ)
typically less than 0.5% of reading at nominal maximum air speed
Air mass flow rate systematic uncertainty (2σ) typically less than 1.0% of reading at nominal maximum mass flow rate
Accuracy of Base Measurements Probe tip coordinates and duct dimensions
determined from 3D laser survey with 0.04” (1 mm) accuracy
Sound pulse flight times measured using oven controlled crystal oscillator (OCXO) to 0.5 µs accuracy
Static air pressure measured to 0.1% accuracy (0.05% optional)
Principle of Measurement Air mass flow rate = air mass flux
x duct area x duct factor Air mass flux = air speed x air density Air speed: calculated from sound pulse
flight times and probe tip coordinates Air density: calculated from sonic velocity
and static air pressure Sonic velocity: calculated from sound pulse
flight times and probe tip coordinates Duct area: determined from duct survey Duct factor: determined from CFD analysis
107502.1 Specifications for AirSonic System Page 1 of 5
Data CommunicationsAll AirSonic data is accessible via OPC or MODBUS TCP. The signals include:
Air density (lb/ft3) Air flow angle (°) Air mass flux (lb/s/ft2) Air mass flow rate (lb/s) Air pressure (psia) Air speed (ft/s) Air velocities (ft/s) Air volumetric flow rate (ft3/s) Flight times (ms) Sonic Velocity (ft/s)