A METHOD FOR THE MANUFACTURE OF PIG IRON IN A BLASTFURNACE COMPROSONG SUPERSONIC COMBUSTION TUYERS AND A DEVICE FOR CARRYING OUT THE SAME.

摘要

A method for the manufacture of pig-iron in a blast furnace comprising supersonic combustion tuyeres travelled through at supersonic speed by a comburant whose feed should be variable in operation between anticipated limits, the spraying of the fuel being achieved by means of a shock-wave, a method wherein the pressure of the blast is maintained upstream of each tuyere, likened to a generating pressure, at a value which permits formation of a shock wave in the delivery nozzle whatever the feed of the fuel, the value of the generating pressure being detected and compared with a reference value, and the area of the sonic throat in the tuyere being modified by displacement of a central body in the tuyere so as to maintain the generating pressure always at least equal to a minimum value which ensures formation of a shock wave in the delivery nozzle when the feed of the comburant varies within the anticipated limits.