Abstract: There is provided a bustle pipe arrangement 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 comprises a circumferential bustle pipe arranged along the outer casing of the shaft furnace, at a certain distance therefrom. The arrangement further comprises a plurality of first support arms connecting the bustle pipe to the outer casing of the shaft furnace on a first level; and a plurality of second support arms connecting the bustle pipe to the outer casing of the shaft furnace on a second level, the first level being separate from the second level. The first and second support arms are configured to support the circumferential bustle pipe. First blow channels are arranged through the first support arms for fluidly connecting the bustle pipe to the interior of the shaft furnace.

Abstract: In a blast furnace plant, at least three regenerative heaters are cyclically operated on blast and on gas: while a regenerative heater is operated on gas, hot flue gas is produced and caused to flow through the regenerative heater so as to heat the heat storage elements; and while a regenerative heater is operated on blast, process gas, i.e. a CO-rich fraction of the top gas, is blown through the regenerative heater so that the process gas takes up heat from the heat storage elements, such that during a changeover of a regenerative heater from on-blast to on-gas operation, the regenerative heater is purged from process gas using flue gas collected after having flown through at least one of the regenerative heaters.

Abstract: A checker brick (10) with through passages for a hot blast stove has a top surface (12) and an opposite bottom surface (14) with a plurality of through passages (16) extending from the top surface (12) to the bottom surface (14). The through passages (16) allow fluids to circulate through the checker brick (10). Partition walls (18) are formed between neighboring through passages (16). The through passages (16) have a cross-section based on a hexagonal shape (20) with alternating convex (24) and concave sides (26).

Abstract: A device for regulating the temperature of a gas in a hot gas main for feeding hot gas to a blast furnace includes a mixing pot with two mixing chambers in fluid communication with each other by means of a Venturi restriction. The first mixing chamber includes three inlet ports for feeding hot gas into the first mixing chamber, feeding cold gas into the first mixing chamber and feeding cold gas into the second mixing chamber, respectively. The first mixing chamber further includes an outlet port for feeding a first stream of mixed gas from the first mixing chamber to a first gas distribution system. The second mixing chamber includes a second outlet port for feeding a second stream of mixed gas from the second mixing chamber to a second gas distribution system. The first and second streams of mixed gas have different temperatures.

Abstract: In a blast furnace plant, at least three regenerative heaters are cyclically operated on blast and on gas: while a regenerative heater is operated on gas, hot flue gas is produced and caused to flow through the regenerative heater so as to heat the heat storage elements; and while a regenerative heater is operated on blast, process gas, i.e. a CO-rich fraction of the top gas, is blown through the regenerative heater so that the process gas takes up heat from the heat storage elements. During, such that during a changeover of a regenerative heater from on-blast to on-gas operation, the regenerative heater is purged from process gas using flue gas collected after having flown through at least one of the regenerative heaters.

Abstract: There is provided a bustle pipe arrangement of a shaft furnace that comprises a circumferential bustle pipe arranged along the outer casing of the shaft furnace, the bustle pipe being arranged at a certain distance from the outer casing. The arrangement further comprises a plurality of first arms connecting the bustle pipe to the outer casing of the shaft furnace on a first level; and a plurality of second arms connecting the bustle pipe to the outer casing of the shaft furnace on a second level, the first level being different from the second level. First and second blow channels are respectively arranged through the first and second arms for fluidly connecting the bustle pipe to the interior of the shaft furnace.

Abstract: A ceramic burner for use in a combustion chamber of a regenerative heat generator, such as a hot blast stove of a blast furnace, the ceramic burner including a burner feed chamber with a partition wall for dividing the burner feed chamber into a fuel chamber and an air chamber, where the fuel chamber has a fuel inlet for receiving combustible fuel and a fuel outlet for feeding the combustible fuel to a mixing zone (34), the air chamber having an air inlet for receiving combustion air and an air outlet for feeding the combustion air to the mixing zone, where the ceramic burner further includes a gastight metallic fuel container arranged in the burner feed chamber, the fuel container including the fuel chamber therein, a wall portion of the fuel container forming the partition wall between the fuel chamber and the air chamber.

Abstract: A method for constructing a support ring in a curved wall, in particular around an opening in a curved wall of a hot blast stove, where the method includes providing a plurality of standardized wedge-shaped bricks with side faces having tongue and groove profiles for cooperating with the side faces of the neighboring bricks, the thickness of the brick in the axial direction being in excess of the desired end thickness of the brick, and determining the intended location of each individual brick in the curved wall and determining, based on the intended location, the location of a front cut line and a rear cut line for shaping the front and rear faces of the brick, where the front and rear faces of the brick are then shaped in accordance with the above determined front and rear cut lines by a cutting tool.

Abstract: The present invention proposes a device (10) for regulating the temperature of a gas in a hot gas main for feeding hot gas to a blast furnace. Such a device (10) comprises a mixing pot (14) with a first mixing chamber (16) and a second mixing chamber (18), the first and second mixing chambers (16, 18) being in fluid communication with each other by means of a Venturi-type restriction (20). The first mixing chamber (16) is provided with a first inlet port (22) for feeding hot gas into the first mixing chamber (16), a second inlet port (26) for feeding cold gas into the first mixing chamber (16) and a third inlet port (56) for feeding cold gas into the second mixing chamber (18).

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 checker brick (10), in particular for hot blast stove, has a top surface (12) and an opposite bottom surface (14), wherein a plurality of through passages (16) extend from the top surface (12) to the bottom surface (14) for allowing fluids to circulate through the checker brick (10), partition walls (18) being formed between neighbouring through passages (16). According to an aspect of the invention, the through passages (16) have a cross-section based on a hexagonal shape (20) having alternating convex (24) and concave sides (26).

Abstract: A method for constructing a support ring in a curved wall, in particular around an opening in a curved wall of a hot blast stove, wherein the method includes providing a plurality of standardized wedge-shaped bricks with side faces having tongue and groove profiles for cooperating with the side faces of the neighbouring bricks, the thickness of the brick in the axial direction being in excess of the desired end thickness of the brick, and determining the intended location of each individual brick in the curved wall and determining, based on the intended location, the location of a front cut line and a rear cut line for shaping the front and rear faces of the brick, where the front and rear faces of the brick are then shaped in accordance with the above determined front and rear cut lines by a cutting tool.

Abstract: “A ceramic burner for use in a combustion chamber of a regenerative heat generator, such as a hot blast stove of a blast furnace, the ceramic burner including a burner feed chamber with a partition wall for dividing the burner feed chamber into a fuel chamber and an air chamber, where the fuel chamber has a fuel inlet for receiving combustible fuel and a fuel outlet for feeding the combustible fuel to a mixing zone (34), the air chamber having an air inlet for receiving combustion air and an air outlet for feeding the combustion air to the mixing zone, where the ceramic burner further includes a gastight metallic fuel container arranged in the burner feed chamber, the fuel container including the fuel chamber therein, a wall portion of the fuel container forming the partition wall between the fuel chamber and the air chamber.