# Influence of Burner Nozzle Parameters Analysis on the Aluminium Melting Process
###### Abstract
[9] used Air Liquide Pyre Tron burner and they monitored the melt rate of the charge using O\({}_{2}\) enriched combustion air, with the O\({}_{2}\) volume between 25% and 75%. At this level of enrichment, the melt rate increased within the range of 25% to 50%. According to [PERSON], factors that influence the optimum level of oxygen enriched combustion air include the following: Type of furnace, type of the charge, number and location of burners, and the cost of fuel and oxygen. In their study, [PERSON] et al. [6] addressed the influence of the increased oxidizer oxygen on the combustion process and heat transfer. At the same time, they monitored its influence on the temperature field distribution in the thermal aggregate. In their study, these authors pointed to the fact that no significant changes of the temperature field distribution occur at larger distances from the burner, when the oxidizer oxygen concentration increases and the burner input power remains constant. This can be explained by the findings presented by [PERSON] [14; 15; 16], which state that the increase in combustion temperature caused by the increase in oxygen concentrations in the oxidizer influences mainly the fuel combustion kinetics. The increase in the oxidizer oxygen concentration results in a lower activation energy needed for chemical reactions in the combustion process. Higher oxygen concentrations contribute to the decrease in the amount of the burnt mixture and its flammability at lower temperatures. Ultimately, the combustion rate using pure oxygen is 11 times higher compared to air. Subsequently, when the enrichment technology is used with a burner designed for air fuel combustion, either the flame front is reduced or backflash into the burner may occur. At present, there is only little available literature which deals with the impact of the flame front shortening on the charge heating. The shortening of the flame in the thermal aggregate results in changes in the temperature field distribution due to changes in flowing flue gas turbulence (rate distribution). Consequently, the charge heating process is significantly affected. Therefore, when evaluating the overall effect of oxygen in thermal aggregates, attention should be paid to this particular issue. A solution to the above issue lies in modifying combustion mixture flow rates from the burner. Modifications to the burner nozzle diameters can cause changes in the flame length in the thermal aggregates and, thus, contribute to achieving greater efficiency of using oxygen in the thermal aggregates and to the increase of technological process efficiency. The authors of this article designed and created an experimental burner, featuring the possibility to modify outlet nozzle diameters, and an experimental model of the tilting rotary furnace to investigate the impact of oxygen enrichment on combustion air and the effect of discharge rates on the heating rate and melting of aluminium. The computational fluid dynamiscs (CFD) model of the experimental device was used to design and modify the burner. In the present article we also present a solution to the issue of heat transfer intensification by modifying the burner on the basis of the combustion mixture flow rate change.