Analysis of Pollutant Emissions in Double-stage Swirl Chamber for Gas Turbine Application

Abstract

© 2015 The Authors. Published by Elsevier Ltd.The present paper presents an experimental investigation about a double-stage swirl combustor for future application in gas turbine, in which the unfavorable conditions for pollutant formation (CO, UHC, NOx) are achieved by reagents and burned gases flow dynamics control into the combustor. The lean global combustion regime takes place in two chambers and is controlled by the parameters: global equivalence ratio (Ö), fuel jet Reynolds number (Rej) and swirler blades angle (á). The results have showed that when these parameter contribute to recirculation zone intensification formed at secondary chamber, ie, higher swirler angles and smaller Reynolds numbers, CO and UHC are reduced. For NOx this behavior is also observed, the only exception is the swirler angle, i.e.; the NOx increases when the swirler angle also increases. In addition, as expected, when the equivalence ratio increase the CO e UHC emissions reduce, on the other hand, the NOx emissions increase.

Keywords