Ostapenko Alexander Vasilievich, Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107;
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
Kislyakov Vladimir Gennadyevich, PhD (Engin.), Senior Researcher, Head of Department, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: ovoch-isi@outlook.com, vovkadragon@yandex.ua, ORCID 0000-0002-1775-5050
Manachyn Ivan Oleksandrovych, PhD (Engin.), Senior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: ovoch-isi@outlook. com, manachyn@gmail.com, ORCID 0000-0001-9795-6751

Effect of flow switch on two phase flow evenness based on granular magnesium.

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
99
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.
Key words: cast iron, flow switch, granular magnesium, pulsation.
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