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Applied Physics B

, Volume 110, Issue 3, pp 359–365 | Cite as

Real-time, in situ, continuous monitoring of CO in a pulverized-coal-fired power plant with a 2.3 μm laser absorption sensor

  • Xing Chao
  • Jay B. Jeffries
  • Ronald K. Hanson
Article

Abstract

A real-time, in situ CO sensor using 2.3 μm DFB diode laser absorption, with calibration-free wavelength-modulation-spectroscopy, was demonstrated for continuous monitoring in the boiler exhaust of a pulverized-coal-fired power plant up to temperatures of 700 K. The sensor was similar to a design demonstrated earlier in laboratory conditions, now refined to accommodate the harsh conditions of utility boilers. Measurements were performed across a 3 m path in the particulate-laden economizer exhaust of the coal-fired boiler. A 0.6 ppm detection limit with 1 s averaging was estimated from the results of a continuous 7-h-long measurement with varied excess air levels. The measured CO concentration exhibited expected inverse trends with the excess O2 concentration, which was varied between 1 and 3 %. Measured CO concentrations ranged between 6 and 200 ppm; evaluation of the data suggested a dynamic range from 6 to 10,000 ppm based on a minimum signal-to-noise ratio of ten and maximum absorbance of one. This field demonstration of a 2.3 μm laser absorption sensor for CO showed great potential for real-time combustion exhaust monitoring and control of practical combustion systems.

Keywords

Boiler Environment Combustion Exhaust Continuous Emission Monitoring Practical Combustion System Diode Laser Absorption Sensor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Support was provided by the Electric Power Research Institute with Mr. Richard Himes as program manager and the Air Force Office of Scientific Research with Dr. Chiping Li as program manager. EPRI also arranged access to the coal-fired power plant in Charlotte, NC.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Xing Chao
    • 1
  • Jay B. Jeffries
    • 1
  • Ronald K. Hanson
    • 1
  1. 1.High Temperature Gasdynamics Laboratory, Department of Mechanical EngineeringStanford UniversityStanfordUSA

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