Abstract
According to the structure of purging plugs, the limit gas flow is obtained through theoretical calculation or practical test, that the minimum gas flow is 45Nm3/h and the maximum gas flow is 200Nm3/h.Different bottom blowing patterns suitable for smelting system were established based on different gas supply conditions about two and four purging plugs, at the same time, the maintenance technology of purging plug is developed under the condition of semi-steel steelmaking, these technologies are technology that is effective to improve the service life of purging plugs. A good result has been obtained after the combined blowing technology was put into production. The life of combined blown converters were greatly improved, the average life of combined blown is over 7000 heats, the life of combined blown can be the same with that of converter, the TFe in the slag is lowered by 3.25%, the [O] in steel is decreased by103PPm, the measured [C]·[O] at the end point of smelting is as high as 0.0026, the yield of alloy is increased significantly.
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