US 11,703,280 B2
Method and shaft furnace for burning carbon-containing material in a shaft furnace
Hannes Piringer, Beinwil am See (CH); and Patrick Bucher, Schönewerd (CH)
Assigned to MAERZ OFENBAU AG, Zurich (CH); and THYSSENKRUPP AG, Essen (DE)
Appl. No. 17/436,715
Filed by MAERZ OFENBAU AG, Zürich (CH); and thyssenkrupp AG, Essen (DE)
PCT Filed Mar. 4, 2020, PCT No. PCT/EP2020/055742
§ 371(c)(1), (2) Date Sep. 7, 2021,
PCT Pub. No. WO2020/182584, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 2019/5148 (BE), filed on Mar. 8, 2019; and application No. 10 2019 203 210.9 (DE), filed on Mar. 8, 2019.
Prior Publication US 2022/0170698 A1, Jun. 2, 2022
Int. Cl. F27D 7/02 (2006.01); C04B 2/12 (2006.01); F23L 7/00 (2006.01); F23N 3/00 (2006.01); F27B 1/10 (2006.01); F27D 99/00 (2010.01)
CPC F27D 7/02 (2013.01) [C04B 2/12 (2013.01); F23L 7/007 (2013.01); F23N 3/00 (2013.01); F27B 1/10 (2013.01); F27D 99/0033 (2013.01); F23L 2900/07006 (2013.01); F23N 2221/08 (2020.01); F27M 2003/03 (2013.01); Y02E 20/34 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A shaft furnace for firing material that contains carbonate, the shaft furnace comprising:
in a flow direction of the material, a preheating zone, a firing zone, a cooling zone, and a material outlet for discharging the material;
burner lances that project into the firing zone, wherein a first of the burner lances has a first penetration depth into the firing zone and a second of the burner lances has a second penetration depth into the firing zone that is greater than the first penetration depth;
a first ring conduit that extends around a circumference of a shaft wall of the shaft furnace;
a second ring conduit that extends around the circumference of the shaft wall;
a first primary air conduit that conveys combustion air through the first primary air conduit, into the first ring conduit and into the first burner lance, and a second primary air conduit that conveys combustion air through the second primary air conduit, into the second ring conduit and into the second burner lance;
and
an oxygen conduit that conveys oxygen into the firing zone, wherein the oxygen conduit is disposed such that oxygen flows from the oxygen conduit to the second burner lance, wherein the oxygen conduit is connected exclusively to the second primary air conduit so that oxygen is configured to flow from the oxygen conduit, through the second ring conduit and into the second primary air conduit.