Abstract
Oxygen (O2) and carbon monoxide (CO) are produced in combustion reactions and are important gas species, which are closely related to combustion efficiency and production of air pollutants. O2 generates thermal nitrogen oxide (NOX) by reacting with nitrogen in the air at high temperatures, and the presence of excess O2 also affects the energy efficiency due to increasing exhaust heat energy. CO is generally well known for being a toxic gas, and is a crucial gas species produced by incomplete combustion. However, it is difficult to measure O2 and CO level variations in a huge combustion system, such as used in steel annealing and power plant boilers, because of their harsh environment. Therefore, as a multi-species measurement technique, which is non-intrusive, has a high sensitivity, and high response, tunable diode laser absorption spectroscopy was chosen as the optical method used to measure O2 and CO concentrations in exhaust gases. In this study, experiments were carried out to measure the O2 and CO c...
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