The invention puts forward a method and device for a
blast furnace to blow
coal powder. Characterized by employment of several short spray guns, a large incidence angle, accurate positioning of spray guns, small heat
radiation and long life of blowpipes, and adoption of
ceramic nozzles, the new method and
new device of the invention aims to eliminate various defects in prior art, such as small
coal powder incidence angle, restriction by high speed hot
airflow, inadequate mixing with hot air, long length and long service life of spray guns, large heat
radiation and short service life of blowpipes, and hard use of
oxygen-
coal lances, etc. According to the invention, on the blowpipes of each air ports, each short spray gun is inserted into each installation seat, and coal
powder blown into a
blast furnace enters from blowing inlets positioned on a lateral side of each installation seat, then reaches the inside of each short spray gun through coal spraying holes that are disposed on tube walls of the short spray guns and are over against the blowing inlets, and is finally blown into the furnace through each short spray gun. The device of the invention at least comprises: a
blowpipe with a coal powder precombustion function, short spray guns, installation seats, ball valves, locking devices, coal conveying
branch pipes, a
distributor, a small
ball valve, a coal conveying
pipe, and an inlet connecting piece.