Use of Spectral Flame Analyzer for Combustion Control in Industrial Boilers

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Title Use of Spectral Flame Analyzer for Combustion Control in Industrial Boilers
Creator Batra, Sushil K.; Cole, William E.; Metcalfe, Christopher I.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1986
Spatial Coverage presented at Chicago, Illinois
Abstract Large industrial boilers incorporate a multiplicity of burners. Combustion controls regulate the quantity of fuel and airflow to these burners in an amount appropriate to the load demands. The combustion controls have two purposes: (1) maintain constant steam conditions under varying loads by adjusting fuel flow, and (2) maintain an appropriate air-to-fuel flow for complete combustion of the fuel. The optimum excess air level for the best boiler efficiency occurs when the sum of the loss due to incomplete combustion and the loss due to heat in the flue gas is minimum. Presently, the combustion control system monitors the emissions (02, C02' CO) in the flue gas and, based on these measurements, varies the fuel and/or air supplied to a set of the burners. Although the overall stoichiometry of the combustion process may be optimized by the presentcontrol system, for the majority of the industrial boilers, the individual burners may have very different operating characteristics due to varying burner parameters. These may result in local reducing conditions if the air supply is insufficient, and result in incomplete combustion, slagging, and an increase in unburned combustibles. A high level of "excess air" would result in significant energy loss, increased Sox and NOx formation, and increased power consumption by forced and induced draft fans. An instrument based on spectral emissions has been under development for several years at Thermo Electron for assessment of the combustion conditions in individual burners in a multiburner boiler. A prototype instrument has been designed, built, and tested in a Combustion Research Facility. Further tests are planned in an industrial boiler to evaluate the benefits of this emerging technology. Besides providing optimum individual burner performance, the instrument can be used as a diagnostic tool to detect improper functioning of individual burners, and for burner tuneup. This paper describes the principle of operation of the Spectral Flame Analyzer (SFA) test results in the MIT Combustion Research Facility, the developmental program for industrial application, and potential benefits of this technology.
Type Text
Format application/pdf
Language eng
Rights This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee.
Conversion Specifications Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth.
Scanning Technician Cliodhna Davis
Metadata Cataloger Kendra Yates
ARK ark:/87278/s6x63qhh
Setname uu_afrc
Date Created 2012-04-20
Date Modified 2012-08-06
ID 3698
Reference URL