Numerical Simulation Of Desulfurization Process With Jet Stirring Flows In Hot Metal Pretreatment

Competition in steel market is more and more intense, and customers have also putforward more requirements to steel. In the present production of iron and steel, hot metalpretreatment technology is more and more widely used. Hot metal pretreatmenttechnology includes three parts: desulfurization, dephosphorization and desilication. Thisstudy comes from the Wuhan Iron and Steel Group’s actual pre-desulfurization process,including KR stirring method and jet stirring method. This paperstudies the desulfurization process of hot metal pretreatment with the jet stirring method.Water model experiments carried out in the Wuhan Iron and Steel Research Institute.This paper uses CFD software FLUENT for simulation, and the results are comparedwith water model experiments. Simulation contains: the flow inside the water modelexperiment container, the trajectories and distribution of the particles injected with thegas. Finally, the paper also attempts to use FLUENT’s own user-defined custom functionsto solve the scalar equations to simulate the chemical reaction process.In the jet stirring desulfurization, the gas is emitted from a nozzle. In the particleascending process, bubbles suffer reduced pressure and expand till burst. In thesimulation, we use the VOF method to capture evolution of bubbles and changes of theliquid-air free surface in different conditions. Different conditions mainly refer to thenozzle insertion depth and the speed of the gas injected. There are three kinds of nozzleinsertion depth:100mm,200mm and300mm. The speed of the gas injected is varied:5m/s,10m/s and15m/s. Particles’initial velocity is the same as the speed of the gas.Since the geometry and internal flow field in the water model experiment containeris axis-symmetric, this paper uses a two-dimensional axis-symmetric model in theestablishment of the computational model, and fewer computational grids and shortercalculation time are needed.