الفهرس 
ABSTRACTOnly 14 pages are availabe for public view
 |  | from | 251 |  |  |
| | | from | 251 | | |
Abstract
Abstract
In this study, experimental and numerical work is done to investigate the combustion characteristics and emission performance of a 350-kW industrial burner equipped with a furnace fuelled with different types of biofuels and a mixture of diesel and biofuels. The obtained results are used to validate the simulation data of the combustion inside the furnace. The equivalence ratio was adjusted by varying the air flow rate and maintaining the fuel flow rate constant. CO, HC, soot, and NOx were measured. Also, flame temperatures were recorded at different positions.
Biofuels and liquid biofuel-diesel blends were used. The tested fuel blends were B100 (pure biodiesel), 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), D90E10 (diesel 90% bioethanol 10%by volume ), D85E15(diesel 85%.bioethanol 15%by volume ), and D75E25 (diesel 75%.bioethanol 25%by volume ). Practical experiments showed that pollutants CO, HC, and soot emissions of biodiesel B100 and diesel-biofuel blends are decreased compared with diesel fuel. Moreover, NOx emission is increased. The maximum flame temperature and exhaust temperature are increased. In the case of ethanol-diesel blend the NOx emission and flame temperature and exhaust temperature decrease compared with diesel. Additionally, mixing multifunctional Thermol-D fuel additives with pure diesel D100 and pure biodiesel B100 significantly improved all combustion characteristics and burner emissions.
Co-combustion of two-phase fuel has been investigated for biogas and diesel or biodiesel, as well as solid biomass and diesel. A three-percentage biogas co-combustion with diesel or waste cooking oil has been studied Biogas1 (75% CH4, 25% CO2), Biogas2 (70% CH4, 30% CO2), and Biogas3 (60% CH4, 40% CO2). Practical tests have demonstrated that in comparison to biogas and diesel fuel, the CO emission level of co-combustion biogases and biodiesel for B100Biogas1, 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 12%, 10%, and 9%, respectively. The results of measuring the CO2 concentrations in biogas further demonstrate that CO2 has a significant influence on the chemical reactions occurring in the flame. With more carbon dioxide in the biogas, the flame temperature and NOx emissions decreased, but the carbon monoxide emissions increased. The co-combustion of solid biofuels made from waste agricultural pellets at various loading ratios L1, L2, and L3 with diesel was investigated to study the combustion and emission performance, as well as the ability to co-combust solid fuel with diesel. The result indicates that using solid biofuel reduces CO, HC, smoke opacity, and NOx emissions compared to diesel fuel. In terms of combustion characteristics, the solid loading ratio of biomass increases exhaust gas temperatures and maximum gas flames. In comparison to diesel.