scope:

INTRODUCTION

The effectiveness of flame modifications in reducing NO_x emissions from package boilers is presently being investigated in a three-phase program. During Phase I, a versatile oil-fired facility was designed and constructed to serve as an experimental arena for investigating control techniques⁽¹⁾ (a sketch of the facility is shown in Figure 1), The present report documents the work of Phase II which utilized the experimental facility in a systematic investigation of burner modifications, flue gas recirculation, and staged combustion as methods of emission control for oil-fired package boilers. During the testing, control techniques were sought that require both minor modifications (applicable to existing boilers) and extensive modifications (primarily applicable to a redesign of new boilers). Having determined promising emission control techniques during the activities of Phase II, we recommend that these techniques be applied to actual field operating boilers during Phase III.