Flow control device and method for improving cleanliness of molten steel in pouring process

Abstract

The invention provides a flow control device and method for improving cleanliness of molten steel in the pouring process, and belongs to the technical field of molten steel pouring facilities and methods. According to the technical scheme, induction heating coils, roughing slag detection main coils and roughing slag detection auxiliary coils are arranged inside a pocket block, and are arranged to surround an upper water gap in sequence from top to bottom. The induction heating coils and the roughing slag detection main coils face the upper portion and the middle of the upper water gap, and the roughing slag detection auxiliary coils face the lower portion of the upper water gap. The induction heating coils and the roughing slag detection main coils are connected with an alternating-current power source, and voltage monitoring devices are installed in circuits. The flow control device and method for improving the cleanliness of molten steel in the pouring process are initiative in the pouring protection technology, solve the problems which are not effectively solved for a long time at present in the pouring process, such as the problems that the automatic pouring rate of molten steel is insufficient, secondary oxidation exists in the oxygen combustion drainage pouring process, the steel ladle pouring end point cannot be accurately judged, and slag in a steel ladle enters a tundish, and achieve whole-journey pouring protection in the real sense.

Description

technical field [0001] The invention relates to a flow control device and method for improving the cleanliness of molten steel during pouring, and belongs to the technical field of molten steel pouring equipment and methods. Background technique [0002] The content and size of inclusions in steel have a great influence on the surface and internal defects, surface properties and fatigue properties of steel. Therefore, it is necessary to reduce inclusions in steel and improve the cleanliness of steel. At present, in the production process, technical measures such as molten iron pretreatment, converter steelmaking, out-of-furnace refining, and protective casting are mainly used to control inclusions in molten steel and improve the flow field of molten steel, thereby achieving the purpose of improving the cleanliness of steel. [0003] During the pouring process of molten steel, the molten steel inevitably contacts with air, resulting in secondary oxidation, which increases the...

AI Technical Summary

Problems solved by technology

However, due to the inaccurate weighing of the continuous casting ladle turret in some steel plants, or the constant change of the lining weight due to erosion, and the amount of slag in each furnace is different when the converter is tapping, these factors affect the accuracy of the judgment of the pouring end point

Some steel mills have to remove the long nozzle in advance and observe with the naked eye to determine the casting end point. During this period, the molten steel will be severely re-oxidized.

In addition, in order to prevent the slag in the ladle from entering the tundish, some steel mills use the operation of keeping steel in the ladle when producing some steels that have very strict requirements on the purity of steel, such as automobile plates. Although this meets the quality requirements, the molten steel lower yield of

At the same time, the traditional method of judging whether the ladle is slag-loaded according to the experience of the molten steel and slag flowing through the refractory casing has a large error. Due to the different experience of the operators, some slides are obviously closed early, and some are closed when the slag is obviously dropped. Skateboard, so the quality of molten steel fluctuates greatly

From the perspective of labor protection of operators, long-term observation of the slag in the steel flow with the naked eye will cause adverse consequences such as vision loss

[0008] In summary, at present, problems such as insufficient automatic pouring rate of molten steel in the pouring process, secondary oxidation during the pouring of oxygen-fired drainage, accurate determination of the pouring end point of the ladle, and slag in the ladle entering the tundish directly affect the protective pouring. The cleanliness of molten steel in the process affects the quality of steel production

These problems have not been effectively solved for a long time, and have become a long-standing problem that plagues enterprises and technicians. They need to be solved urgently to improve the quality of steel and the production efficiency of enterprises.

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