Investigation of the Effect of FGR on Emissions Characteristics and Performance of an Industrial Burner Operated with Diesel Fuel

Industrial diesel burners emit various hazardous gases, including carbon monoxide (CO) and nitrogen oxides (NOx). Industrial burners can reduce their negative environmental impacts by reusing flue gases. This research aimed to determine how flue gas recirculation affects burner emissions and performance parameters. Various flue gas recirculation ratios were tested in this experiment, including 0, 5, 10, and 15%, as well as 20, 25, 30, 35, 40, and 45% air-to-fuel (A/F) ratios. The air-to-fuel ratio, abbreviated A/F, refers to the air-to-fuel ratio in the external combustion chamber. The results demonstrated a thermal efficiency of 83% and reduced nitrogen oxides (NOx) emissions to 8 parts per million (ppm). At a 30% air-to-fuel ratio and a 10% flue gas recirculation (FGR) ratio, carbon monoxide (CO) emissions were reduced by 0.11% and carbon dioxide (CO2) by 7.7%, respectively. Maintaining the same air-to-fuel (A/F) ratio of 30% and without flue gas recirculation (FGR) in the burner, the following results were achieved: 86% thermal efficiency, nitrogen oxide (NOx) emissions reduced to 18 ppm, and carbon monoxide (CO) emissions reduced to 14 and 0.5%, respectively. These results highlight the importance of FGR systems in reducing (NOx) emissions and their impact on efficiency. The lower temperatures resulting from FGR further impair efficiency, and a balance between combustion efficiency and emissions control can be achieved with modest amounts of FGR. The technology in this study has the potential to inspire innovative burner or FGR system designs that maximize performance while reducing polluting emissions from industrial oil burners.