Process for fitting a gas-injecting nozzle in a wall and means for carrying out this process

A process for mounting a gas injection nozzle through a wall of a furnace for the forced discharge of gas to prevent the clogging of the furnace, the steps comprising:

• inserting the nozzle with a front surface into a passage through the wall, the wall being a molded brick wall and the insertion being such that the passage receiving the nozzle delimits the nozzle, the nozzle having a channel whose cross-section widens in a direction towards front surface, which front surface faces an interior of the furnace;
• connecting an end of the nozzle opposite the front end to means for producing a forced gas discharge;
• and wherein the inserted nozzle has an external supporting surface with a shape complementary to an internal supporting surface of the passage, and wherein these complementary internal and external supporting surfaces which are identical except for the mounting clearance and which extend axially along respective lengths such that they allow a sliding of the nozzle with its external supporting surface inside the internal supporting surface of the passage over a distance such that the insertion step is until the front surface of the nozzle is flush with an inner surface of the wall in an initial position;
• locking the nozzle into the initial position;
• and,
• at least periodically, in order to compensate for the wear on the front surface of the nozzle, inserting the nozzle further toward the interior of the furnace until the front surface of the nozzle returns to being flush with the inner surface of the wall.