| 摘要 |
Predicting a degree of molten steel contamination during ladle exchange includes setting a casting quantity (Q) and a residual quantity (Qrm). Casting quantity (Q) is the molten steel amount transferred from a tundish to a mold when a first ladle operation ends. Residual quantity (Qrm) is the molten steel amount existing in the tundish when a second ladle starts. Casting amount (Qplug), a first contaminant concentration is calculated as a function of Qrm and a proportional coefficient. Casting amount (Qpeak), the amount a second contaminant concentration, is calculated as a function of Qrm and a second proportional coefficient. A preliminary degree of contamination is a linear function of Q, Qplug, and Qpeak. A second preliminary degree of contamination is an exponential function of Q, Qplug, and Qpeak. The smaller of the two preliminary degrees of contamination is selected to obtain a degree of contamination at the ladle operation end and a second degree of contamination at the second ladle operation start. |
| 主权项 |
1. A method for predicting a degree of contamination of molten steel during ladle exchange, the method comprising the steps of:
providing a first ladle conveying a quantity of molten steel; providing a second ladle conveying a quantity of molten steel; the first ladle and second ladle each performing an operation to supply the respective quantity of molten steel to a tundish in turn; a contamination prediction system, (1) determining a casting quantity (Q), the amount of molten steel transferred from the tundish to a mold at the end of an operation of the first ladle, and determining a residual quantity (Qrm), an amount of molten steel existing in the tundish at the start of the operation of the second ladle; (2) calculating, a first casting amount (Qplug), the casting amount of the molten steel contained in the tundish, when a concentration of contaminants is substantially 0.1, Qplug being determined as a function of Qrm and a first proportional coefficient (g), where g is determined as Qplug/Qrm and has a value between 0.1 and 0.3, and calculating a second casting amount (Qpeak), which is the casting amount of the molten steel contained in the tundish, when a concentration of contaminants is substantially 1, Qpeak being determined as a function of Qrm and a second proportional coefficient (h), where h is determined as Qpeak/Qrm and has a value between 0.2 and 0.4; (3) determining a first preliminary degree of contamination as a linear function of the casting quantity Q, the first casting amount Qplug, and the second casting amount Qpeak, and determining a second preliminary degree of contamination as an exponential function of the casting quantity Q, the first casting amount Qplug, and the second casting amount Qpeak; and (4) obtaining a first degree of contamination at the end of the operation of the first ladle and obtaining a second degree of contamination at the start of the operation of the second ladle by selecting the a smaller of the first preliminary degree of contamination and the second preliminary degree of contamination. |
