Abstract: The present invention proposes a method for feeding hot gas to a shaft furnace (12), wherein the method comprises feeding a first portion (32) of a first gas flow (24) to a mixing chamber (36) and feeding a second portion (34) of the first gas flow (24) into said shaft furnace. The method further comprises feeding a second gas flow (28) to the mixing chamber (36), allowing the first portion (32) of the first gas flow (24) to mix with the second gas flow (28) in the mixing chamber (36), thereby forming a third gas flow (38), and feeding the third gas flow (38) to the shaft furnace (12). The first gas flow (24) has a first volumetric fluid flow rate (V1), a first temperature (T1) and a first pressure (p1); the second gas flow (28) has a second volumetric fluid flow rate (V2), a second temperature (T2) and a second pressure (p2); and the third gas flow (38) has a third volumetric fluid flow rate (V3), a third temperature (T3) and a third pressure (p3).

Abstract: Tuyere stock arrangement (10) of a blast furnace comprising a tuyere (14) having a tuyere body (20) configured for installation in a blast furnace wall (12); the tuyere body (20) having an outer wall (22), a front face (24) and a rear face (26), the tuyere body (20) further having a tuyere channel (28) extending from the rear face (26) to the front face (24), the tuyere channel (28) forming an inner wall (30) in the tuyere body (20). The tuyere stock arrangement (10) further comprises a blowpipe (34) connected between the rear face (26) of the tuyere body (20) and a gas feeding device (38), the blowpipe (34) being configured and arranged so as to feed hot gas, generally hot blast air, from the gas feeding device (38) to the tuyere channel (28) for injection into the blast furnace.

Abstract: The present invention proposes a bustle pipe arrangement (10) of a shaft furnace, in particular for feeding hot gas into the shaft furnace such as e.g. a blast furnace, wherein the bustle pipe arrangement (10) comprises a circumferential bustle pipe (12) arranged along the outer casing (14) of the shaft furnace, at a certain distance therefrom. The arrangement (10) further comprises a plurality of first support arms (22) connecting the bustle pipe (12) to the outer casing (14) of the shaft furnace on a first level; and a plurality of second support arms (24) connecting the bustle pipe (12) to the outer casing (14) of the shaft furnace on a second level, the first level being separate from the second level. The first and second support arms (22, 24) are configured to support the circumferential bustle pipe (12). First blow channels (26) are arranged through the first support arms (22) for fluidly connecting the bustle pipe (12) to the interior of the shaft furnace.

Abstract: The present invention proposes a bustle pipe arrangement (10) of a shaft furnace, in particular for feeding hot gas into the shaft furnace such as e.g. a blast furnace, wherein the bustle pipe arrangement (10) comprises a circumferential bustle pipe (12) arranged along the outer casing (14) of the shaft furnace, the bustle pipe (12) being arranged at a certain distance form the outer casing (14). The arrangement (10) further comprises a plurality of first arms (22) connecting the bustle pipe (12) to the outer casing (14) of the shaft furnace on a first level; and a plurality of second arms (24) connecting the bustle pipe (12) to the outer casing (14) of the shaft furnace on a second level, the first level being different from the second level. First and second blow channels (26, 30) are respectively arranged through the first and second arms (22, 24) for fluidly connecting the bustle pipe (12) to the interior of the shaft furnace.

Abstract: A method for operating a blast furnace and a corresponding blast furnace, the method including recovering top gas from the blast furnace, submitting at least a portion of the top gas to a recycling process, and feeding the recycled top gas back into the blast furnace, where the recycling process includes feeding the recovered top gas to a reformer unit, feeding volatile carbon containing material to the reformer unit, proceeding to flash gasification of the volatile carbon containing material in the reformer unit, at a temperature between 1100 and 1300° C., and thereby producing devolatised carbonaceous material and synthesis, and allowing the devolatised carbonaceous material and synthesis gas to react with the recovered top gas.