US 12,259,184 B2
Method of heating up furnace bottom, and burner lance used in the method
Yohei Kitamura, Tokyo (JP); Yasukazu Hayasaka, Tokyo (JP); Katsunori Kikuchi, Tokyo (JP); Hiroki Yamaguchi, Tokyo (JP); Satoshi Maruyama, Tokyo (JP); and Kouji Uchimura, Tokyo (JP)
Assigned to JFE Steel Corporation, Tokyo (JP)
Appl. No. 17/441,770
Filed by JFE Steel Corporation, Tokyo (JP)
PCT Filed Mar. 23, 2020, PCT No. PCT/JP2020/012587
§ 371(c)(1), (2) Date Sep. 22, 2021,
PCT Pub. No. WO2020/196360, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-059746 (JP), filed on Mar. 27, 2019.
Prior Publication US 2022/0178612 A1, Jun. 9, 2022
Int. Cl. F27B 1/08 (2006.01); C21B 7/12 (2006.01); C21C 5/46 (2006.01); F23D 14/20 (2006.01); F27B 1/00 (2006.01); F27B 1/10 (2006.01); F27D 1/00 (2006.01); F27D 99/00 (2010.01)
CPC F27B 1/08 (2013.01) [C21B 7/12 (2013.01); F23D 14/20 (2013.01); F27B 1/00 (2013.01); F27B 1/10 (2013.01); F27D 99/0033 (2013.01); C21B 7/125 (2013.01); C21C 5/4606 (2013.01); C21C 5/4653 (2013.01); F23D 2214/00 (2013.01); F27D 2001/0079 (2013.01); F27D 2099/0036 (2013.01); F27D 2099/0038 (2013.01); F27D 2099/0058 (2013.01); F27D 2099/006 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of heating up a furnace bottom for heating up the furnace bottom by a burner lance provided in a tap hole of the furnace bottom of a blast furnace, the method characterized by comprising:
a step of opening, in the tap hole, a hole larger than a diameter of the burner lance so as to penetrate into the furnace;
a step of solidifying a molten material that comes out from the opened hole;
a step of opening a burner lance insertion hole having a diameter larger than the diameter of the burner lance in the solidified molten material so as not to penetrate into the furnace;
a step of installing the burner lance in the opened burner lance insertion hole;
a step of filling a gap between the installed burner lance and a furnace exterior side of the tap hole with a refractory;
a step of fusing again the solidified molten material at a burner lance tip portion; and
a step of blowing in gas for heating into the furnace from the burner lance to heat up the furnace bottom.