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

Santanu Pramanik and R.V. Ravikrishna

Energy, 2022, vol. 254, issue PB

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.

Keywords: Syngas; N2 dilution; Reverse-flow; Rayleigh thermometry; OH Fluorescence (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:254:y:2022:i:pb:s036054422201235x

DOI: 10.1016/j.energy.2022.124332

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