ВЛИЯНИЕ ПЕРЕКЛЮЧАТЕЛЯ ПОТОКА НА РАВНОМЕРНОСТЬ ДВИЖЕНИЯ ДВУХФАЗНОГО ПОТОКА НА ОСНОВЕ ЗЕРНИСТОГО МАГНИЯ

Abstract

The aim of the work was to study, with the help of a laboratory setup, the influence of the existing design of the flow switch on the uniformity of movement of a two-phase flow, consisting of granular magnesium and compressed gas. On the basis of a typical layout of injection systems for the injection of granular magnesium at the pig iron desulphurization plants in the ladles, a laboratory installation has been created that allows the generation of a stable uniform flow of granular magnesium in a stream of compressed air. The stream was passed through a transparent full-scale model of a standard unit for switching the flow into three lances, while the angle of inclination of the device itself, the flow switch, changed. The process was recorded by video. The frame-by-frame analysis of the video image made it possible to study the effect of the existing design of the flow switch at different angles of inclination on the uniformity of the movement of the two-phase flow along the path of the injection system during ladle desulfurization of the molten iron with granular magnesium. The presented studies made it possible to establish the main causes and reveal the mechanism of the generation of pulsations in the cavity of the studied node of the flow switch. It is shown that the volume of the switch cavity contributes to the accumulation of magnesium in it and when tilting more than 22° to the horizon, spontaneous pouring of the accumulated magnesium in the cavity occurs, which is the main reason for the occurrence of pulsations. The recommendations developed on the basis of the research results and their implementation on the existing cast iron desulfurization unit in 100 ton buckets of the new steel plant of the Qingdao Steel Plant (Qingdao, PRC, 2016) made it possible to reduce roughness during processing and ensure stable reagent injection with a double intensity.