Process efficiency in the blast furnace is influenced by the gas flow pattern, which is dictated by the burden profile. Therefore, it is important to control the burden distribution so as to achieve reasonable gas flow in the blast furnace operation. Additionally, the charging pattern selection is important as it affects the burden trajectory and stock profile. For analysis of the burden distribution, a new analysis model was developed by use of the spreadsheet program, Microsoft ® Office Excel, based on visual basic. This model is composed of the falling burden trajectory and a stock model. The burden trajectory is determined by the burden type, batch weight, rotating velocity of the chute, tilting angle, and friction coefficient. After falling, stock lines are formed by the angle of repose, which is affected by the burden trajectory and the falling velocity. The mathematical formulas for developing this model were modified by a scaled model experiment and DEM simulation.
The effect of oxygen/argon mixing ratio in the bottom blowing gas on the decarburization behaviour of high carbon ferromanganese melt was investigated in the temperature range of 1350 -1550°C. Thermodynamic analysis indicates that high melt temperature and low Pea are essential for an effective decarburization. An empirical equation for the utilization ratio of oxygen for decarburization was derived as functions of the melt temperature and the oxygen/argon mixing ratio in the refining gas. The utilization ratio of oxygen for decarburization sharply increases as the melt temperature increases and the oxygen ratio in blowing gas decreases. In oxygen refining of high carbon ferromanganese melt, it is not desirable to inject oxygen through bottom tuysres in an early stage of refining. When the melt temperature is low, the oxygen predominantly oxidizes the manganese in melt in spite of high carbon contents. The injection of oxygen/argon mixture gas is found to be an effective decarburization technique when the melt temperature is higher than 1500°C.
Cas Entkohlungsverhalten von hochkohlenstoffhaltigenFerromanganschmelzen. Der EinfluB des Oz/Ar-Mischunqsverhaltnisses im Ruhrqas beim Bodenblasen auf das Entkohlungsverhalten einer hochkohlenstoffhaltigen Ferromanganschmelze wurde im Temperaturbereich 1350 -1550°C untersucht. Die thermodynamische Analyse zeigt, daB eine hohe Temperatur und ein niedriger Pea grundlegend fur eine wirksame Entkohlung mit Sauerstoff sind. In Abhiingigkeit von der Temperatur und dem O/2Ar-Mischungsverhiiltnis wurde eine empirische Gleichung, die den Sauerstoffnutzungsgrad fur die Entkohlung beschreibt, hergeleitet. Der Sauerstoffnutzungsgrad nimmt mit zunehmender Temperatur und abnehmendem 02/Ar-Verhaltnis deutlich zu. 1m ersten Blasabschnitt des Frischprozesses ist das Bodenblasen mit Sauerstoff im Faile hochkohlenstoffhaltiger Ferromanganschmelzen nicht erwunscht. Obwohl der Kohlenstoffgehalt hoch ist, oxidiert Mangan bei niedriger Badtemperatur bevorzugt in der Schmelze. Das Einblasen eines Oz/Ar-Gasqernisches in die Schmelze erweist sich als gunstig, sobald die Badtemperatur auf uber 1500°C ansteigt.
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