Entkohlungsreaktionen mit unruhigem Blasverhalten beim Aufblasen von Sauerstoff auf Fe‐C‐Schmelzen

Abstract

Reaktionen in der Gasphase und an der Badoberfläche. Filmaufnahmen von pulsierenden Vorgängen. Entkohlungsreaktionen nach Art von Siedeverzügen. Ruhiges und unruhiges Blasverhalten. Abgas‐ und Brennflecktemperaturen. Kleinkonverter‐ und Induktionsofenversuche.

Some observations and insights on BOS refining

“…At ∼4 min into the blow, ∼22 ppm dissolved oxygen (in equilibrium with the gas phase), is predicted at 1 atm, and ∼44 ppm at 2 atm. Measured early blow total oxygen levels in the bulk metal bath reported in the literature [Koch3, 4 ∼60 ppm, Price5 ∼50 ppm] are generally higher than these calculated equilibrium values.…”

“…This range of values for the percentage of metal in the emulsion complies with many previous studies. [3][4][5][6][7][8][9][10][11][12][13][15][16][17][18][19][20][21][22][23][24][25][26][27][28] It should be noted that at a fixed oxygen lance height, the distance between the lance tip and the metal bath 'surface' will vary significantly because of the changing amount of metal that is transferred between the bulk metal bath and the emulsion throughout the blow.…”

Law of Mass Action Based Kinetic Approach for the Modelling of Parallel Mass Transfer Limited Reactions: Application to Metallurgical Systems

“…In basic oxygen furnace, for example, the temperature of the gas jet impact area may exceed 2 000°C. [1][2][3] Comparable circumstances are found also in other industrial applications: the temperature in the modern combustion furnaces varies from 1 088-1 173 K (815-900°C) in fluidized boilers, 1 923 K (1 650°C) in pulverized coal boilers and up to 2 200-2 603 K (1 927-2 330°C) in premixed gaseous burners. 4) In many of the aforementioned applications, the local kinetic reaction rate and the rate expression at the reaction interface is unknown and virtually impossible to measure.…”

“…Mika JÄRVINEN, 1) * Ville-Valtteri VISURI, 2) Eetu-Pekka HEIKKINEN, 2) Aki KÄRNÄ, 2) Petri SULASALMI, 2) Cataldo De BLASIO 1) and Timo FABRITIUS The objective of this paper was to present a new law of mass action based rate expression for mass transfer limited reversible reactions. A simple reaction model was derived for parallel oxidation of silicon, chromium and carbon under conditions relevant to the argon-oxygen decarburization (AOD) process.…”

Oxygen Distribution at the Hot Spot in BOF Steelmaking

“…The assumption can be valid, due to intensive interaction of the impinging jet and therefore enhancing the mixing of the hot metal. The reaction-controlled mechanism was disregarded as it was found that hot spot temperatures can exceed well over 2000 °C [11] and even at lower temperatures, these phenomena play a subservient role. [1] The total species transport to the hot spot is proportional to the area of the cavity (calculated using the model of Koria [12] ), and the specific species transport through the gaseous boundary layer (using Eq.…”