Dynamic modelling of vacuum circulation process for steel decarburization

Kleimt, B.; Köhle, S.

doi:10.1051/metal/199592040493

Cited by 2 publications

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“…where n is the number of Ar bubbles, calculated with G and r b,0 . The equilibrium partial pressure, P Ar,CO , is calculated by Equation (10).…”

Section: Decarburization At Ar Bubble Surfacementioning

confidence: 99%

“…• P Ar (10) where n Ar is a constant value in Ar bubble, and n CO is determined by the total decarburization amount that takes place at Ar bubble surface during its floating process. P Ar can be obtained by Equation (11).…”

Section: Decarburization At Ar Bubble Surfacementioning

confidence: 99%

“…This saves time and therefore money. Hence, mathematical models [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] are widely used to evaluate the decarburization behaviour of RH treatment. Some representative mathematical decarburization models are shown in Table 1, which can be divided into two categories.…”

Section: Introductionmentioning

confidence: 99%

“…One category studies the decarburization behaviour through field operations [9,10]. Firstly, the carbon volumetric coefficient ( ak C ) and oxygen volumetric coefficient ( ak O ) were obtained through small scale experiments [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Mathematical model for decarburization of ultra-low carbon steel during RH treatment

Huang

Cheng

Wang

et al. 2019

Ironmaking & Steelmaking

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A mathematical model was established to investigate the decarburization behaviour of ultra-low carbon steel during Ruhrstahl-Heraeus (RH) refining process. In this model, it was assumed that the decarburization reactions occur at four sites: Ar bubble surface, bath surface, bulk steel and splash droplet surface. The effect of Ar bubble behaviour and splash droplet behaviour on decarburization rate was taken into consideration specifically. The calculated results are basically consistent with the industrial experimental observations. Carbon concentration was mainly eliminated at bath surface at early stage of RH treatment, and was mostly removed in bulk steel at middle stage, and was removed at splash droplet surface in the final stage. The decarburization rate at different sites and its contribution to total decarburization value were evaluated in detail. The decarburization rate during RH treatment could be effectively improved by accelerating the drop of vacuum pressure at early stage. Appropriate increasing Ar gas flow rate was beneficial to deep decarburization by increasing the reaction area of droplet surface and bath surface.

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“…where n is the number of Ar bubbles, calculated with G and r b,0 . The equilibrium partial pressure, P Ar,CO , is calculated by Equation (10).…”

Section: Decarburization At Ar Bubble Surfacementioning

confidence: 99%

Section: Decarburization At Ar Bubble Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mathematical model for decarburization of ultra-low carbon steel during RH treatment

Huang

Cheng

Wang

et al. 2019

Ironmaking & Steelmaking

View full text Add to dashboard Cite

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Dynamic model for on-line observation of the current process state during RH degassing

2001

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Based on the principles of thermodynamics and reaction kinetics, a dynamic model for the vacuum circulation (RH) process was developed. It comprises decarburisation, oxygen removal, dehydrogenation, denitrogenation and the course of steel temperature. The process model was validated by comparison of simulation results with measured process data from the RH/1 plant of Voest Alpine Stahl Linz (VASL). At this plant, it is used for on-line observation of the contents of carbon, oxygen, hydrogen and nitrogen as well as the steel temperature. Based on cyclically measured values of vessel pressure, lift gas flow rate as well as waste gas flow rate and composition, the current heat status is calculated reliably. The accuracy of the carbon balance with measured waste gas values was improved remarkably by a model-based correction calculation. The on-line process observation system provides the operator with valuable information on the progress of vacuum treatment. Dynamisches Modell zur on-Iine-Beobachtung des aktuellen ProzeBzustands wiihrend derEntgasung in der RH-Anlage. Basierend auf thermodynamischen und reaktionskinetischen Grundlagen wurde ein dynamisches Modell tur die Vakuum-Umlauf-(RH-) Entgasung entwickelt. Es umfaBt die Entkohlung, den Sauerstoffabbau, die Dehydrierung, die Entstickung und den Verlauf der Stahltemperatur. Das ProzeBmodell wurde uber den Vergleich von Simulationsergebnissen mit ProzeBmeBwerten der RH/1-Anlage der Voest Alpine Stahl Linz verifiziert. An dieser Anlage wird das Modell zur on-line-Beobachtung der Gehalte von Kohlenstoff, Sauerstoff, Wasserstoff und Stickstoff sowie der Stahltemperatur genutzt. Anhand der zyklisch erlaBten MeBwerte fur GefaBdruck, F6rdergasdurchfluB sowie Abgas-durchfluB und -analyse wird der aktuelle ProzeBzustand zuvsrlasslq berechnet. Die Genauigkeit der Kohlenstoffbilanz uber die Abgas-meBwerte konnte durch eine modellbasierte Korrekturrechnung deutlich verbessert werden. Die on-line-ProzeBbeobachtung stellt dem Bediener Informationen uber den Verlauf der Vakuumbehandlung zur Verfuqunq.

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Dynamic modelling of vacuum circulation process for steel decarburization

Cited by 2 publications

References 0 publications

Mathematical model for decarburization of ultra-low carbon steel during RH treatment

Mathematical model for decarburization of ultra-low carbon steel during RH treatment

Dynamic model for on-line observation of the current process state during RH degassing

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