Blast furnace tapping method for reducing circulating flow of molten iron in hearth

Abstract

The invention provides a blast furnace tapping method for reducing a circulating flow of molten iron in a hearth. The method comprises 1) determining a smelting period of a blast furnace with an effective volume; 2) automatically collecting end time of a blocking iron notch of a clay gun when every tapping finishes and assigning a variable t1, and determining end time of a last-time tapping; 3) determining interval time of tapping; 4) reading amounts and chemical components of all minerals, cokes and coke nuts in a time period from t1-T-30 to t1-T, and assigning corresponding variables; and reading blowing amounts and chemical components of coal powders in a time period from t1-270 to t1-240, and assigning corresponding variables; and calculating a production amount of liquid slag and iron in the hearth during the interval time of tapping; 5) determining a volume of the slag and iron and a liquid level in the hearth under a dynamic condition; 6) determining an appropriate sectional area of an iron-notch channel and an appropriate diameter of a drilling rod. The method ensures that the liquid level in the hearth decreases uniformly during a tapping process, reduces the circulating flow of the molten iron, reduces an erosion degree of carbon bricks, and is helpful for iron notch maintenance and blast furnace longevity. The method reduces a time fluctuation of the slag and iron tapping, and is helpful for a transportation management of hot-metal ladles.

Description

technical field [0001] This patent relates to the comprehensive technical field of blast furnace longevity. In particular, the invention relates to a blast furnace tapping method for reducing the circulation of molten iron in a furnace hearth. Background technique [0002] The working state of the hearth has a decisive influence on the high efficiency and long life of the blast furnace. As a place for storing molten iron and slag, the hearth must maintain stable tapping performance for a long time. The flow rate is stable and uniform, keeping the liquid level of slag and iron in the hearth falling steadily, reducing the erosion of the hearth by the circulating flow of molten iron, and ensuring that the charge is evenly lowered. Among hearth parameters, the most important variables are molten iron, slag volume and liquid level, but these variables cannot be directly measured. [0003] The existing method for measuring the height of the molten iron level (the Chinese patent ...

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Problems solved by technology

[0004] In the tapping operation in front of a large blast furnace, since the capacity of slag and iron in the hearth and the height of the liquid level cannot be judged, the flow rate of molten iron sometimes becomes unstable during the tapping operation, causing the flow rate of molten iron to be too fast and the liquid level in the hearth to drop Too fast, and the molten iron circulation aggravates the erosion of the carbon bricks in the hearth, especially the carbon bricks in the taphole area, and it is easy to cause a large flow of molten iron, which is not conducive to the maintenance of the taphole. At this time, the countermeasures for blast furnaces are often controlled by appropriate air reduction measures The flow rate of molten iron will not only have a negative impact on the efficient operation of the blast furnace, but also be detrimental to the longevity of the blast furnace

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