Abstract
Experimental studies were made of NOx formation in and its emission from a diffusion flame matrix burner, which is known as a typical shortflame burner. Profiles of temperature, stable-species and NOx concentrations were measured in detail for methane flame at atmospheric pressure, and the process of NOx formation and the NOx emission characteristics were examined. Measurements were made under various conditions of the air and fuel ejection-velocities for several types of burner matrices, and the effects of these parameters on the NOx formation in the flame zone and on the NOx emission were investigated. Results show that the formation of NOx is confined to a very narrow region about the flame zone and the NOx formation and emission are controlled mainly by the air ejection velocity. The NOx emission levels are found to be lower than those of usual combustion appliances.
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