METHOD FOR FEEDING HOT GAS TO A SHAFT FURNACE

摘要

The present invention proposes a method for feeding hot gas to a shaft furnace, in particular into a blast furnace. The method comprises providing a tuyere stock arrangement comprising a bustle pipe (56) arranged for receiving hot gas form a gas main (58) and a plurality of tuyere stocks (18) for feeding hot gas from said bustle pipe (56) into said shaft furnace, said tuyere stocks (18) being arranged around the circumference of said shaft furnace, each tuyere stock (18)comprising a downleg section (39) for connection to a bustle pipe; a blowpipe (34) for feeding the hot gas to the shaft furnace through a tuyere arranged in an opening in a shell (12) of the shaft furnace; and an elbow (37) arranged between the downleg section (39) and the blowpipe (34). According to an aspect of the invention, a Laval type restriction (40, 40', 40'') is arranged in the tuyere stock (18).