Numerical Simulation Study Of Biodiesel Immersion Injection And Combustion In Copper Bath Smelting Process

Submerged blow technology is large amount of used in the metallurgical industry because of simple structure and low cost.This paper are aim to solve the prombles that low fuel utilization and massive consumption of primary energy in the copper smelting,combining the rich characteristics of biomass resources in Yunnan Province,and main research submerged blow and combustion process of biodiesel in the molt slag bath.In this study,we developed calculation model of submerged blow of biodiesel to simulate copper smelting process,and this calculation model is verifed by test.This paper is main study as follows,on the one hand study different atomization air velocity for trajectory and particle size distribution of biodiesel influence in the molt slag bath;On the other hand study difference volume fraction of O₂ have influence to combustion of biodesel and move of gas bubble and bath.The study on submerged injection process of biodiesel results show that spray tip penetration distance of the biodiesel spray droplets increases;The farther is from the lance in the bubble,the larger the SMD of the oil droplets.After the initial instability period of the atomization,the SMD distribution of the oil droplets remains stable and gradually decreases when entering the water area;The larger the atomizing air flow rate,the farther the oil droplet particle SMD is located from the nozzle;The movement trajectory of the oil droplet particles is:the bubble diffuses forward at a certain atomization half angle;when the oil droplet reaches the bottom of the bubble,the oil droplet particles diffuse to the entire space centering on the bottom plane of the bubble;The axial velocity of the biodiesel spray droplets slightly increases and then significantly decreases within the bubble generated at the nozzle tip.The axial velocity of the biodiesel spray droplets tends to stabilize when the spray droplets enter the water region.The study on submerged combustion process of biodiesel shows that The characteristics of biodiesel immersion combustion are that from a nozzle immersed in copper smelting were examined.The gas from the biodiesel combustion was examined at various O₂ volume fractions,and the simulation model was experimentally verified.The results reveal that the biodiesel submerged combustion process is not continuous,and primarily occurs in the bubble connected to the nozzle.The bubble area is the high-temperature zone in the melt.The temperature change is divided into four stages which includes an irregular change,followed by stabilisation,a rapid decrease,and finally a gradual decrease.It is observed that the radiation transfer heat is relatively less compared with an industrial furnace.In summary,the formation and motion of the gas bubbles are similar to the cold bottom blow process.The rising trajectory of the bubble in the molt slag bath is a curve,and the shape of the bubble changed from spherical to elliptical and finally oblate.The liquid velocity is larger in the axis area and lesser in the near wall area.This paper conducts preliminary research on the biodiesel submerged combustion process,which is beneficial to improve the fuel utilization rate during the smelting process,reduce the investment cost of smelting,and ultimately achieve the goal of sustainable development.