liquid biofuels are one of the most widely utilized today, bioethanol and biodiesel are essential to the development and advancement of the industry. In this research, an experimental investigation of the effects of biofuel blends with diesel on pollutant emissions and combustion characteristics of a 350-kW industrial burner. Tested fuel blends were D100, D50B50 (50% diesel and 50% biodiesel by volume), D50B50E15 (50% diesel, 50% biodiesel, and 15% bioethanol by volume), and D50B50E25 (50% diesel, 50% biodiesel and 25% bioethanol by volume). The equivalence ratio was adjusted to five values by varying the air flow rate and maintaining the fuel flow rate constant at 0.14 l/min.CO, HC, soot, and NOx were measured. Also, flame temperatures were recorded at different positions. The result indicates that utilizing the fuel blends D50B50, D50B50E15, and D50B50E25 reduces CO by (about 19, 69, and 65%), HC by (about 18, 37 and 28%), and smoke opacity emissions by (about 8, 50, and 30%) respectively, compared to diesel fuel. On the other hand, NOx emission significantly rises at D50B50E15 and D50B50E25. In terms of combustion characteristics. Biofuel mixture D50B50, D50B50E15, and D50B50E25 increase exhaust gas temperatures by (about 2, 3 and 1%), and maximum gas flames (about 5, 9 and 4%) respectively, compared to diesel. The ethanol percentage of more than 15% in the blends lowers the maximum flame temperature within the furnace and reduces the length and area of the flame. It is evident from this research that biofuel for industrial burners can produce optimum combustion characteristics and lower emissions.

The purpose of this study is to use biogas produced in industrial wastewater treatment plants to generate energy by co-combustion with diesel fuel or biodiesel to avoid the unstable flow rate of biogas and the variable methane ratio, which determines the biogas energy content. An experimental analysis was conducted in this study to determine the combustion and emissions performance of a 350 KW industrial burner fuelled with three different percentages of biogas: Biogas1 (CH4 75%, CO2 25%), Biogas2 (CH4 70%, CO2 30%), and Biogas3 (CH4 60%, CO2 40%) co-combusted with diesel or waste cooking oil biodiesel. Practical tests have demonstrated that in comparison to biogas and diesel fuel, the CO emission level of co-combustion biogases and biodiesel for B1000Biogas1, B100Biogas2, and B100Biogas3 was reduced by 60%, 50%, and 42%, while NOx emission increased by 52%, 47%, and 43%, along with the maximum flame temperature, by 9%, 10%, and 12%, respectively. The flame structures of the fuels in the swirl burner were investigated using flame pictures and contour temperature. The flame color for biodiesel and biogas was more brilliant and intense than for diesel and biogas. All the fuel test results demonstrate that inert CO2 in biogas composition has a substantial influence on the chemical reactions occurring in the flame and pollutant emissions due to its dilution effect and slowing oxidation reaction. The higher inert CO2 gas ratio in biogas caused a reduction in reaction intensity, which resulted in a weaker, unstable flame and also decreased flame temperature and NOx emissions. yield as well as high fermentation efficiency.