No_x Emission Characteristics of a Diffusion Flame Matrix Burner

Abstract

Experimental studies were made of NO_x 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 NO_x concentrations were measured in detail for methane flame at atmospheric pressure, and the process of NO_x formation and the NO_x 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 NO_x formation in the flame zone and on the NO_x emission were investigated. Results show that the formation of NO_x is confined to a very narrow region about the flame zone and the NO_x formation and emission are controlled mainly by the air ejection velocity. The NO_x emission levels are found to be lower than those of usual combustion appliances.