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The use of optical flame scanners for combustion process analysis in OP-650 power boiler

Nabagło D., Podgórski P., Janda T., Sokołowski P.

Archivum Combustionis

2015

Vol. 35 nr 2

99--116

Optical flame scanners are commonly used in flame supervision systems (FSS) for the purpose of protection against of flame loss inside the combustion chamber. The presence or absence of flame is indicated by the scanner according to analysis of electromagnetic radiation changes in the wavelength range 700÷1700 nm emitted by supervised flame. The use of digital signal processing technology in IR spectrum allows to recognize the supervised flame with very high ability and allows to use the signals for combustion process analysis. Electromagnetic field disturbances in the infrared due to changes in the flame, are determined by the combustion process properties in burner zone i.e. the burner heat load, excess air ratio, temperature of PF mixture, the amount and swirl of primary and secondary air. The ability of use the information provided by the scanners - in this unique parameters supervised flame i.e. flame temperature, power spectral density and the radiation amplitude changes - became the basis for the initiation of studies regarding the optical flame scanners use for combustion process analysis. The paper presents the first results of work on the use of optical flame scanners in the analysis of combustion process in 650 t/h live steam power boiler in EDF Power Plant in Rybnik. The boiler is supplied by 5 coal mill units, each of coal mills supplies 4 pulverized coal burners (PF burners). The boiler has a start-up installation consisting of 12 heavy oil burners placed in PF burners and individually controlled by 12 flame scanners. Based on the analysis of the measuring data obtained from scanners an assessment of the quality of the combustion process for 2 coal mill units (8 PF burners) have been done.