Shevchenko Serhiy Anatoliyovych, Ph.D., Senior Researcher, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: shev_serg@i.ua, ORSID 0000-0002-9287-9177
Shevchenko Anatoliy Pylypovych, Dr. Sci. (Engin.), Professor, Leading Researcher, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; email: ovoch-isi@outlook.com, ORCID 0000-0003-0867-6825

 

A.P. Tolstopyat, L.A. Fleyer, V.I. Yeliseyev

 

THE STUDY OF THE VELOCITY OF DISPERSED PARTICLES
AT DIFFERENT ANGLES OF DIVISION OF A TWO-PHASE FLOW

Summary. The aim of this work is to assess the influence of a t-shaped
divider (α = 180°) on the speed of movement of spherical particles along the
path of a two-nozzle lance in the air stream. Also, comparison with the results
of flow separation experiments at smaller angles. The performed studies
showed that in the t-shaped divider the reagent particles have a complex
trajectory of motion. Part of the particles has an outflow velocity corresponding
to other types of divider (7 – 14 m/sec), and the other equilibrium part of the
particles is slowed down and has an outflow speed 4 – 5 times lower (1 – 3
m/sec). This is reflected by the bimodal nature of the distribution of the results.
In this regard, the transition from single particles to a denser flow (in the case
of an increase in the reagent supply intensity) will lead to instability of the
injection process, to pulsations and even blocking of the lance. This under
conditions of flow into the melt will lead to blockage of the nozzle. This is
confirmed by individual attempts to inject granular magnesium through a tshaped lance in cast iron desulfurization plants. In this case, magnesium was
introduced with overestimated flow rates of the transporting gas and an
intensity of no more than 5–6 kg/min, which is 5 times less than through a yshaped two-nozzle lance. In addition, the injection was carried out through one
nozzle, since the other in the first seconds of the release of magnesium was
clogged. The process proceeded violently and was accompanied by splashes of
cast iron from the ladle. It is established that, in comparison with the flow
separation angles ( = 30, 60, 90), the t-shaped divider ( = 180) reduces
the speed of magnesium and polystyrene particles to a greater extent (by 20 –
50%). In addition, the physical characteristics of the interacting materials, the
shape of the particles, the flow rate of the transporting gas, and the length of the
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nozzle after the divider significantly affect the speed of movement of a solid
particle along the path of a two-nozzle lance.
Keywords: iron desulfurization, magnesium, injection, tuyere, flow
divider
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