Patent ID: 8540931

Claim:
A nozzle for injecting oxygen-containing gas into a pig iron production unit, comprising at least one gas channel, wherein an injector insert pipe, which can be inserted into the gas channel of the nozzle in exchangeable fashion, is arranged in the gas channel of the nozzle in such a way that an interspace which surrounds the injector insert pipe is present over the entire length of the injector insert pipe between a wall of the gas channel and an outer wall of the injector insert pipe, the injector insert pipe is provided with spacers which support said pipe, when it has been inserted, on the wall of the gas channel, the injector insert pipe is produced from refractory material, the injector insert pipe extends at least as far as an end face of the nozzle which contains a mouth of the gas channel, a space surrounded by the injector insert pipe is connected to a feed line for oxygen-containing gas, and wherein an interspace between the wall of the as channel and the outer wall of the injector insert pipe is connected to a supply line for protective gas; wherein the end face of the nozzle which contains the mouth of the gas channel is provided with one or more insert pieces made from refractory material, wherein an outlet edge of the mouth is completely covered.