Comparison of the Accuracy of In-Situ Diode Laser Measurements of Carbon Monoxide in Reheat Furnaces Relative to Extractive Techniques

摘要

Diagnostic measurements of species concentration and temperature are critical for achieving and maintaining optimal operation of combustion-driven processes. Two general methods exist for making such measurements: extractive and in-situ. Extractive measurements have traditionally been used and the method consists of withdrawing a gas sample through a suction probe, quenching or cooling the sample, conditioning the sample, and introducing the sample into a variety of types of analyzers depending on the species being measured. However, extractive sampling techniques have issues, some of which have been investigated in this work. They include the fact that gas sampling is labor intensive, it does not allow for real time optimization, it is not continuous, it does not sample the entire furnace, and as we shall see, delivering a representative sample of reactive species from a high temperature combustion zone to the analyzer is non-trivial.