NDLI: Comparative Study of Syngas Mild Combustion Characteristics in Swirl Diffusion and Coflow Diffusion Staged Combustor

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Huang, Mingming Zhang, Zhedian Shao, Weiwei Xiong, Yan Liu, Yan Lei, Fulin Xiao, Yunhan
Copyright Year	2013
Abstract	MILD combustion is a promising combustion technology for the future gas turbine combustor due to its high combustion efficiency, low exhaust emissions and enhanced combustion stability. It utilizes the concept of exhaust gas recirculation to achieve combustion at reduced temperature and flat thermal field. To examine the role of gas recirculation level on MILD combustion performance, a laboratory-scale axially staged combustor constituted of gas generation zone, mixing zone and MILD combustion zone is presented. To realize ultra-low NOx emissions for syngas characterized by high flame temperature, it is necessary to select an appropriate combustion mode for the gas generation zone. This study compared combustion performance and gas/fuel/air mixing feature between two configurations, gas generation zone of which are based on swirl diffusion combustion and coflow diffusion combustion, respectively. The results are compared on flow field with numerical simulation, and global flame signatures and exhaust emissions with experiment. Both numerical simulation and experiment are performed at equivalence ratio of 0.4, heat load of 24.4 kW, using 10 MJ/Nm3 syngas as the fuel at atmospheric pressure and normal temperature fuel and air. More uniform oxidizer, lower flame temperature and less NOx production are observed in coflow diffusion staged combustion. MILD combustion zone is beneficial for the reduction of NOx and oxidation of CO exit from the gas generation zone.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791855119
DOI	10.1115/GT2013-95349
Volume Number	Volume 1B: Combustion, Fuels and Emissions
Conference Proceedings	ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2013-06-03
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Temperature Stability Computer simulation Atmospheric pressure Combustion Fuels Diffusion (physics) Flow (dynamics) Stress Syngas Emissions Exhaust systems Flames Heat Exhaust gas recirculation Gas turbines Gaseous fuels Nitrogen oxides Oxidation Combustion chambers Combustion technologies
Content Type	Text
Resource Type	Article

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