BLAST PIPE AND TUYERE ARRANGEMENT

摘要

Coal dust and oxygen are supplied to the blast pipes (14) of a blast furnace through lances (22, 23) that comprises two con- centric tubes (25, 26) that end adjacent the tuyeres (13) or in the tuyeres. The heat resistant tip of each lance forms an extension of the inner coal dust supply tube, and it also forms an extension of the annul ar space between the tubes (25, 26) in the form of a number of helical channels (42) through which the oxygen passes. It is advantageous to have more than one lance in each blast pipe and to have the lances extend obliquely into the hot blast channel (24) that is formed by the blast pipe (14) and the tuyere (13).