Development of Spectral Flame Analyzer for Individual Burner Control in Boilers: Final Report.

摘要

Optimum continuous combustion control of a multiple burner system can be achieved only if each individual burner can be continuously checked. The most promising method to achieve individual control is based on spectral emission from each burner flame. The intensity of certain emissions from chemical species formed during combustion are indicative of the fuel-air ratio of the burner. An optical monitor tuned to these emission bands provides the needed burner control signal. Tests were conducted to develop this technology. The first tests were conducted using laboratory scanning radiometers to look at the spectral emissions. These tests clearly showed the active wavelength bands and how the intensity varied with excess air level, firing rate, swirl, and fuel type. This information was used to upgrade a prototype analyzer previously built and tested. This analyzer was installed on a 1000-lb/hr package boiler and operated for four months. Results showed a response to excess air level, swirl, and firing rate. (ERA citation 13:051930)