Experimental investigation of the oxygen enrichment in synthetic gases flames

• Published in: Fuel (Guildford) 2020-06, Vol.270, p.117482, Article 117482
• Main Authors: Alabaş, Buğrahan, Tunç, Güven, Taştan, Murat, Yilmaz, İlker
• Format: Article
• Language: English
• Subjects: Calorific value; Carbon monoxide; Combustion; Combustion chambers; Combustion efficiency; Composition effects; Emission analysis; Emissions; Emissions control; Equivalence ratio; Experiments; Flue gas; Gases; Oxygen; Oxygen enrichment; Scale models; Synthetic gas; Temperature distribution
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2020.117482

•Investigating combustion and emission behavior of premixed syngas mixtures.•Axial and radial temperature, and emission measurements were performed.•Measuring temperature and pollutant emission values throughout the combustor.•Analyzing swirl number and oxygen enrichment on combustion characteristics. Today, there are many different studies on increasing combustion efficiency and reducing flue gas emission values. In this study, H2 and CO have been added to 30% methane gas in a premixed laboratory scale model burner with high H2 / CO ratio (3) and medium (1.5). Swirl numbers (s = 0.6 and 1) have been changed by keeping the equivalent ratios constant. The experiments have been carried out at a constant burner power (3 kW), regardless of the fuel composition. The effect of the swirl number on the temperature distribution and emission values in the combustion chamber has been investigated radially and axially. At the low swirl number, CO emissions tend to increase with the decrease of H2/CO ratio. On the other hand, at the high swirl number, it has been observed that the decrease in CO emissions with the decrease of H2/CO ratio. Because of the high heating value of the hydrogen, NO emissions increased with the high H2/CO ratio, regardless of the swirl number. As a result of the experiments, it has been concluded that the swirl number and the rate of H2/CO has a great effect on combustion characteristics and emissions of flames. In addition, oxygen enriched combustion has been performed at constant (1) swirl number at different H2/CO ratios. Equivalence ratio was kept constant (0.7) for all experiments. It has been observed that the oxygen-enriched combustion has been caused the low CO and high NO emission at both mixtures. The experiments also showed that the increase of O2 ratio in the air for high H2/CO ratio (3) could be causing the increase in temperature.