Method for dynamically controlling type of 120-ton converter

The invention discloses a method for dynamically controlling the type of a 120-ton converter. The method comprises the following steps of: when the bottom of a converter ascends, a slag layer of a converter body is thick and the converter capacity rate becomes small, adding 0.7-3.0 tons of limestone into the converter, then, adding 5-20 tons of scrap steel, pressing the scrap steel on the limestone, and finally, adding 100-115 tons of molten iron to blow; and when the bottom of the converter descends, the slag layer of the converter body is thin and the refractory corrosion is accelerated, reducing the oxygen content of molten steel by using a control method for increasing the height of an oxygen lance and reducing the oxygen blowing strength to realize high-carbon tapping. By using the method, the problems that the bottom of the converter ascends, the slag layer of the converter body is thick, the converter capacity rate becomes small, the bottom of the converter descends, the slag layer of the converter body is thin and the refractory corrosion is accelerated are effectively solved, and the production cost is reduced.