US 11,959,147 B2
Lance nozzle
Yumi Murakami, Tokyo (JP); Nobuhiko Oda, Tokyo (JP); Yusuke Fujii, Tokyo (JP); Goro Okuyama, Tokyo (JP); Shota Amano, Tokyo (JP); Shinji Koseki, Tokyo (JP); Shingo Sato, Tokyo (JP); Yukio Takahashi, Tokyo (JP); Ryo Kawabata, Tokyo (JP); Naoki Kikuchi, Tokyo (JP); and Atsuo Yuasa, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/601,481
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Apr. 2, 2020, PCT No. PCT/JP2020/015189
§ 371(c)(1), (2) Date Oct. 5, 2021,
PCT Pub. No. WO2020/209173, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 2019-074289 (JP), filed on Apr. 9, 2019.
Prior Publication US 2022/0154299 A1, May 19, 2022
Int. Cl. C21C 5/46 (2006.01)
CPC C21C 5/4606 (2013.01) 12 Claims
OG exemplary drawing
 
1. A lance nozzle configured to blow refining oxygen to molten iron charged in a reaction vessel by blowing a gas from a top-blowing lance to the molten iron, wherein
one or more blowing holes for blowing a working gas into a main hole nozzle of the lance nozzle are provided on an inner wall side surface of the nozzle at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site,
wherein the working gas is received from outside of the reaction vessel,
wherein in the neighboring site, the nozzle has a cross-sectional area in the nozzle axis direction of not more than 1.1 times the minimum cross-sectional area in the nozzle axis direction, and
wherein a total of hole lateral widths of respective openings of the blowing holes is not less than 25% and not more than 75% of a circumference of the nozzle.