Blast furnace with shaft feeding of hot process gas

A shaft furnace, in particular a blast furnace, comprising:

• a metal shell defining a furnace outer wall;
• a plurality of tuyeres arranged around the metal shell at a tuyeres level in order to inject hot blast into the shaft furnace;
• means for injecting process gas, in particular hot reducing gas, into the shaft furnace at an injection level above said tuyeres level;
• wherein said means for injecting hot process gas include at least one injector, said injector comprising:
• a nozzle body with a peripheral wall extending along a longitudinal axis from a front portion, with at least one injection hole, to an opposite rear portion connected to a base member, wherein the nozzle body includes an inner gas channel for guiding process gas from an inlet port in the base member to said injection holes(s);
• said nozzle body being mounted trough an aperture in said metal shell in such a way that the front region with injection hole(s) is located on the inner side of said metal shell, whereas said rear portion is outside of said metal shell;
• and
• wherein said base member comprises a peripheral mounting portion configured for connecting said injector in a gas tight manner to a mounting unit surrounding said aperture in said metal shell.