Effects of Different RH Degasser Nozzle Layouts on the Circulating Flow Rate

Abstract

The effects of gas flow rate and 22 kinds of nozzle layouts on the circulation flow rate were researched during the RH refining process using a water model and a mathematical model. Numerical simulations agreed with the water model experiment well. The results showed that the circulating flow rate increased with an increase of the gas flow rate. The critical value of the gas flow rate was 2.4 m3/h. Out of the 22 kinds of layouts, the 127-87 symmetrical layout was the optimal layout, for which the circulating flow rate reached 29.8 m3/h, the area of blind zone was the smallest and the mixing effect of the molten steel was the best. The working stroke and carrying capacity of the bubbles were important factors that affected the circulating flow rate. Among the four types of layouts, when the nozzles were in the one-side layout and the one-row layout, the main factor for improving the circulating flow rate was the working stroke of the bubbles. When nozzles were in the staggered layout and the symmetrical layout, the carrying capacity of the bubbles was the main factor for improving the circulating flow rate. For the same conditions, the carrying capacity of the bubbles had a greater effect on improving the circulating flow rate than the bubble stroke.

Numerical Simulation of the Density Effect on the Macroscopic Transport Process of Tracer in the Ruhrstahl–Heraeus (RH) Vacuum Degasser

“…Since the invention of RH refining technology, many researchers have studied the flow and mixing processes of fluids in RH through physical model experiments [11][12][13][14][15][16][17], numerical simulations [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], or plant measurements [36]. In studies of the mixing process using tracers, Chen et al [37] experimentally investigated the effects of the amount, concentration, and type of salt tracers on fluid flow behavior in the tundish, finding that the residence time distribution (RTD) curves of salt tracers in continuous casting tundish shifted to the left compared to calculated curves.…”

Study on Multiphase Flow Characteristics During RH Refining Process Affected by Nonradial Arrangement of Gas‐Blowing Nozzle

“…In addition, the refractory erosion in the up‐snorkel is more serious under a nonsymmetrical blockage condition. [ 24 ] Zhang et al [ 25 ] studied the effect of nozzle layouts on the circulation flow rate. The results show that the highest circulation flow rate was obtained for the symmetrical nozzle layout, compared to the one‐side nozzle layout, one‐row nozzle layout, and the staggered nozzle layout.…”