Tuyere of blast furnace

Claim 1

Apparatus for blowing pulverized coal into a blast furnace, comprising: a water-cooled tuyere having a water-cooled jacket means for containing cooling water; burner means removably mounted inside of a receiving space of said water-cooled jacket means of said water-cooled tuyere for burning pulverized coal, said burner means having an outlet end having an outlet opening; said burner means including: an inner feed pipe, an intermediate pipe and an outer pipe which are all concentrically arranged so as to form concentric spaced apart circles in cross section; said inner feed pipe having an inner space defining an inner feed path for feeding said pulverized coal; an intermediate feed path for feeding oxygen being defined by a space formed between said inner feed pipe and said intermediate pipe; and an outer feed path for feeding tuyere nose flame temperature control gas being defined by a space between said intermediate pipe and said outer pipe; said outlet opening of said burner means including a jetting-out opening at said outlet end of said burner means, in communication with said feed paths, for mixing said pulverized coal with said oxygen gas and said tuyere nose temperature control gas; and said burner means including a water-cooled jacket means arranged at least around the outside of said outlet end of said burner means and inside of and adjacent to said water-cooled jacket means of said water-cooled tuyere so as to provide an overlapped structure, for cooling said outlet end of said burner means, said water-cooled jacket means of said burner means being substantially completely overlapped with and independent of said water-cooled jacket means of said water-cooled tuyere when said burner means is in said receiving space of said water-cooled jacket means, and said burner means and its water-cooled jacket means being slidably removable as a unit from said receiving space of said water-cooled jacket means of said water-cooled tuyere.