Experimental Study of the Impact of Flue Gas Recirculation on the Combustion Characteristics of LPG Diffusion Flame

Document Type : Original Article

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Mechanical Power Engineering Dep., Faculty of Engineering, Port Said University, Port-Said, Egypt

Abstract

This study aimed to experimentally evaluate the impact of the Flue Gas Recirculation (FGR) on the combustion parameters of a diffusion flame of Liquefied Petroleum Gas (LPG) within a cylindrical combustor model. A flue gas recirculation system is employed to facilitate the recirculation of combustion gases. The combustion gases are then blended with the primary air stream to mitigate the emissions of nitrogen monoxide (NO) that arises from the elevated temperature within the combustor tube. For all operating settings, the Air to Fuel mass Ratio (AFR), Equivalency Ratio (Φ), swirl number (S), and Thermal Load (T.L.) were fixed at 40, 0.4, 0.5, and 21 kW, respectively. The experimental testing rig consists of a gaseous fuel line, an airline, a flue gas recirculation line, a burner head, and combustor tube. The impact of the varying FGR percentages, which are 0, 5, 8, 11, 14, 17, and 20 % are investigated. The experimentally observed and reported data include temperature distributions, exhaust species concentrations, dimensionless visible flame length, and heat transfer to cooling water. The findings showed different outcomes were seen when the flue gas recirculation fraction was increased from 0 % to 20 %. This led to a decrease in the axial flame temperature, flame length, heat transfer to cooling water, NO concentration, and O2 concentration. On the other hand, when the flue gas recirculation % rose, the concentrations of CO2 and CO showed a rise.

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Journal of Advanced Engineering Trends
Volume 44, Issue 1
January 2025
Pages 98-105

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