Title:
POWDER INJECTION LANCE AND METHOD OF REFINING MOLTEN IRON USING SAID POWDER INJECTION LANCE
Document Type and Number:
WIPO Patent Application WO/2013/057927
Kind Code:
A1
Abstract:
This powder injection lance is provided with: a refining oxygen gas injection nozzle which has multiple ejection openings that are arranged at intervals along a circular trajectory and inject an oxygen gas into an iron bath housed in a reaction vessel; and a burner nozzle which has an axial center coaxial with the central axis of the circular trajectory, and which has an ejection opening which forms a flame on the inside of said refining oxygen gas injection nozzle and which injects into the iron bath a powder to which heat has been transferred by said flame. An indicator showing the positional relation between the ejection opening of the refining oxygen gas injection nozzle and the ejection opening of the burner nozzle fulfills A=1.7(R-r-d/2)/L+tan(θ-12°)-0.0524>0. Here, R is the radius (mm) of the circular trajectory, r is the radius (mm) of the ejection opening of the burner nozzle, d is the diameter (mm) of the ejection openings of the refining oxygen nozzle, θ is the inclination angle (°) of the axial center of the refining oxygen gas injection nozzle, and L is the lance height (mm). By this means, the efficiency of heat transfer to the iron bath is improved.
Inventors:
OKUYAMA GORO (JP)
KIKUCHI NAOKI (JP)
UCHIDA YUICHI (JP)
TAKAHASHI YUKIO (JP)
SATO SHINGO (JP)
NAKASE KENJI (JP)
TA YASUTAKA (JP)
MIKI YUJI (JP)
KIKUCHI NAOKI (JP)
UCHIDA YUICHI (JP)
TAKAHASHI YUKIO (JP)
SATO SHINGO (JP)
NAKASE KENJI (JP)
TA YASUTAKA (JP)
MIKI YUJI (JP)
Application Number:
PCT/JP2012/006610
Publication Date:
April 25, 2013
Filing Date:
October 16, 2012
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21C5/46; C21C1/02; C21C5/30
Foreign References:
| JP2011157570A | 2011-08-18 | |||
| JP2004093110A | 2004-03-25 | |||
| JP2003172584A | 2003-06-20 | |||
| JP2002523631A | 2002-07-30 | |||
| JPH0920913A | 1997-01-21 | |||
| JPS6067610A | 1985-04-18 | |||
| JP2000345226A | 2000-12-12 | |||
| JPH1180825A | 1999-03-26 | |||
| JP2005336586A | 2005-12-08 | |||
| JP2007092158A | 2007-04-12 |
Other References:
See also references of EP 2752497A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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Claims: