Combustion Characteristics of Catalytic Plate Burner

Abstract

A plate burner with a stack of ceramic filaments, which are catalyzed with Pd are investigated by experiment. As the features of this burner a flame is held near the burner surface because its complicated passages of premixed gas cause vortices to be produced, and also the plate is cooled well by the low temperature premixed gas due to the large passage surface area. The flame made by gas phase reaction activates the catalyst, so that catalytic reaction is caused on the plate surface. Therefore, a preheating device to heat up the burner will not be needed. Two key issues have been examined in this study ; one is the relation between gas phase reaction and surface reaction, and the other is combustion characteristics of this burner. As a result, it is confirmed that the flame made by gas phase reaction causes surface phase reaction a few minutes after ignition. Furthermore, surface reaction activities by catalyst are reduced as either combustion load or excess air ratio increases. However, the concentrations of NO_x and CO can be reduced in a high activity region of catalyst.