Non premixed operation strategies for a low emission syngas fuelled reverse flow combustor

Pramanik, S and Ravikrishna, RV (2022) Non premixed operation strategies for a low emission syngas fuelled reverse flow combustor. In: Energy, 254 .

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Abstract

In the present study, we investigate the combustion of low-calorific value syngas in a reverse-flow combustor at a fuel thermal input of 3.3 kW. A reverse-flow combustor is known to improve stability while reducing pollutant emissions due to internal recirculation. The study is significant for renewable energy applications of syngas obtained from biomass gasification. Equivalence ratio and O2 in the oxidizer have been varied to establish different modes of operation at atmospheric pressure (P = 1.013 bar). Temperature, heat release, CO, and NOx emissions have been measured to characterize the operation modes. The heat release varies significantly with O2 and influences the CO emissions. The NOx emission is insensitive to the parameters due to the low-calorific value of syngas which limits the maximum temperature to around 1700 K. The lowest CO emission of 32 ppm and NOx < 1 ppm has been achieved in the present study. The combustion efficiency of the combustor is greater than 99. The variations in pollutant formation were explained using reactor network models. The instantaneous images of heat release revealed key features of the operation modes. As the N2 dilution level is increased, the chemical timescale increases, leading to a volumetric heat release. Suppression of localized heat release reduces the maximum temperature and consequently the NOx emissions. © 2022

Item Type:	Journal Article
Publication:	Energy
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Atmospheric pressure; Atmospheric temperature; Calorific value; Combustion; Combustors; Nitrogen oxides; Pollution, Heat release; Maximum temperature; N2 dilution; NO x emission; Non-premixed; OH fluorescence; Operation mode; Rayleigh thermometry; Reverse flow; Syn gas, Synthesis gas, alternative energy; atmospheric pressure; biomass; efficiency measurement; instrumentation; thermometry
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	06 Oct 2022 09:36
Last Modified:	06 Oct 2022 09:36
URI:	https://eprints.iisc.ac.in/id/eprint/77184

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