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Proceedings Paper

Field testing the Raman gas composition sensor for gas turbine operation
Author(s): Michael P. Buric; Benjamin T. Chorpening; Jessica C. Mullen; Joseph A. Ranalli; Steven D. Woodruff
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Paper Abstract

A gas composition sensor based on Raman spectroscopy using reflective metal lined capillary waveguides is tested under field conditions for feed-forward applications in gas turbine control. The capillary waveguide enables effective use of low powered lasers and rapid composition determination, for computation of required parameters to pre-adjust burner control based on incoming fuel. Tests on high pressure fuel streams show sub-second time response and better than one percent accuracy on natural gas fuel mixtures. Fuel composition and Wobbe constant values are provided at one second intervals or faster. The sensor, designed and constructed at NETL, is packaged for Class I Division 2 operations typical of gas turbine environments, and samples gas at up to 800 psig. Simultaneous determination of the hydrocarbons methane, ethane, and propane plus CO, CO2, H2O, H2, N2, and O2 are realized. The capillary waveguide permits use of miniature spectrometers and laser power of less than 100 mW. The capillary dimensions of 1 m length and 300 μm ID also enable a full sample exchange in 0.4 s or less at 5 psig pressure differential, which allows a fast response to changes in sample composition. Sensor operation under field operation conditions will be reported.

Paper Details

Date Published: 4 May 2012
PDF: 9 pages
Proc. SPIE 8370, Fiber Optic Sensors and Applications IX, 837009 (4 May 2012); doi: 10.1117/12.919666
Show Author Affiliations
Michael P. Buric, National Energy Technology Lab. (United States)
Benjamin T. Chorpening, National Energy Technology Lab. (United States)
Jessica C. Mullen, National Energy Technology Lab. (United States)
Joseph A. Ranalli, National Energy Technology Lab. (United States)
Steven D. Woodruff, National Energy Technology Lab. (United States)

Published in SPIE Proceedings Vol. 8370:
Fiber Optic Sensors and Applications IX
Henry H. Du; Gary Pickrell; Eric Udd, Editor(s)

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