Numerical study of flow field on molten iron desulfurization with mechanical stirring

Abstract

The flow field of molten iron in the desulfurization process utilizing the mechanical stirring method under three different conditions was investigated using numerical simulation. The three conditions were central and eccentric stirring with the standard impeller and central stirring with the worn impeller, respectively. Three 1/20-scale numerical models were established and four inspection regions were set up on them. In all, 600 sets of instantaneous velocity fields for each model were exported and proper orthogonal decomposition technique was applied to deal with the data. The macroscopic flow field in the normal model operating under standard conditions was analyzed, which found that the mean flow has a relatively large fluctuation in flow field despite having a high proportion in total kinetic energy. A steady close relationship was revealed between the first two modes by studying the correlation of their coefficients. The first four modes were comparatively analyzed, which reflected that the change in the mean flow in the ladle using a worn impeller is slow and eccentric stirring is beneficial to desulfurization due to the asymmetry of the flow field on two sides.

Effect of impellers on particle mixing behaviour in KR desulphurization process

“…Plenty of literature has been published on the experimental aspects of the KR process, e.g. impeller practice [3][4][5][6], particles addition mode [7,8], operation parameters improvement [9][10][11], stirring mode changing [6,[12][13][14][15], adding barriers (such as baffle or pin fins) in the molten pool [6,16,17]. The problem of desulphurizer low utilization rate has been improved to some extent, but some of the results are difficult to operate in desulphurization practice, which limits the improving of reagent efficiency fundamentally.…”

Proper Orthogonal Decomposition Analysis and Dispersion Characteristics of Resonant Acoustic Flow

“…Owing to its reduced order and feature extraction characteristics, POD methods are increasingly being used to study complex flow phenomena. For example, Xiao et al [16] obtained numerical simulations of molten iron flow fields in three different desulfurization processes and used POD to analyze flow field data. e analysis concluded that eccentric agitation is most conducive to desulfurization.…”