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 method for feeding pulverised coal into a blast furnace, wherein the method comprises the following steps: providing a tuyere stock (14) for blowing hot blast air from a bustle pipe (12) into a furnace hearth of a blast furnace through a tuyere (15) in an opening in the furnace wall (16); providing a pulverised coal injection lance (18) for feeding pulverised coal into the tuyere (15), the pulverised coal injection lance (18) comprising an inner pipe (20) for conveying pulverised coal and an outer pipe (22), coaxially arranged around the inner pipe (20), for conveying combustive gas, the inner pipe (20) forming a separation wall for separating the pulverised coal from the combustive gas, the pulverised coal injection lance (18) having a lance tip (24) arranged in the tuyere (15); allowing the pulverised coal and the combustive gas to form a mixture of pulverised coal and combustive gas at the lance tip (24); burning the mixture of pulverised coal and combustive gas in the tuye

Abstract: A method for producing pulverized coal including the steps of providing a drying gas heated to a predefined temperature in a hot gas generator; feeding the heated drying gas into a pulverizer; introducing raw coal into the pulverizer, the pulverizer grinding the raw coal into pulverized coal; collecting a mixture of drying gas and pulverized coal from the pulverizer and feeding the mixture to a filter, the filter separating the dried pulverized coal from the drying gas; collecting the dried pulverized coal for further use and feeding the drying gas from the filter to an exhaust line; and collecting the drying gas exiting the filter and feeding part of the collected drying gas to a recirculation line for feeding recirculation drying gas to the hot gas generator.

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 pulverized coal injection lance (10) for feeding pulverized coal from a rear end of the lance (10) to a front end (11) of the lance (10). The lance (10) comprises an outer pipe (12) for conveying combustive gas, and an inner pipe (14), coaxially arranged within the outer pipe (12), for conveying pulverized coal. The inner pipe (14) forms a separation wall for separating the pulverized coal from the combustive gas. The separation wall is at least partially discontinued in a region near the front end (11) of the lance (10), thereby forming a mixing region (16) within the pulverized coal injection lance (10). According to an important aspect of the invention, the outer pipe (12) and the inner pipe (14) have substantially the same length and wherein the inner pipe (14) comprises at least one lateral opening (18, 20) for allowing pulverized coal and combustive gas to come into contact within the pulverized coal injection lance (10) near the front end (11).

Abstract: A method for producing pulverized coal including the steps of providing a drying gas heated to a predefined temperature in a hot gas generator; feeding the heated drying gas into a pulverizer; introducing raw coal into the pulverizer, the pulverizer grinding the raw coal into pulverized coal; collecting a mixture of drying gas and pulverized coal from the pulverizer and feeding the mixture to a filter, the filter separating the dried pulverized coal from the drying gas; collecting the dried pulverized coal for further use and feeding the drying gas from the filter to an exhaust line; and collecting the drying gas exiting the filter and feeding part of the collected drying gas to a recirculation line for feeding recirculation drying gas to the hot gas generator.

Abstract: The present invention proposes a method for feeding pulverised coal into a blast furnace, wherein the method comprises the following steps: providing a tuyere stock (14) for blowing hot blast air from a bustle pipe (12) into a furnace hearth of a blast furnace through a tuyere (15) in an opening in the furnace wall (16); providing a pulverised coal injection lance (18) for feeding pulverised coal into the tuyere (15), the pulverised coal injection lance (18) comprising an inner pipe (20) for conveying pulverised coal and an outer pipe (22), coaxially arranged around the inner pipe (20), for conveying combustive gas, the inner pipe (20) forming a separation wall for separating the pulverised coal from the combustive gas, the pulverised coal injection lance (18) having a lance tip (24) arranged in the tuyere (15); allowing the pulverised coal and the combustive gas to form a mixture of pulverised coal and combustive gas at the lance tip (24); burning the mixture of pulverised coal and combustive gas in the tuye

Abstract: An apparatus for insertion and extraction of a fuel injection lance into and out of a tuyere stock (1) of a shaft furnace, in particular of a blast furnace, is proposed, the tuyere stock includes a lance sheath that defines an insertion/extraction axis and is mounted in coaxial extension of a lance channel through which an injection lance can be inserted into the tuyere stock where the proposed apparatus includes a linear guide, a carriage and a mounting support, the carriage is movably supported by the linear guide and cooperates with a connecting device for connecting an injection lance to the carriage such that the injection lance can be moved axially along a translation axis by the carriagee, where the linear guide includes a mechanism for linearly moving the carriage along a guide axis and a first coupling half for mounting the linear guide to the mounting support attached to the tuyere stock, the mounting support having a second coupling half cooperating with the first coupling half of the linear guide

Abstract: The present invention proposes a pulverized coal injection lance (10) for feeding pulverized coal from a rear end of the lance (10) to a front end (11) of the lance (10). The lance (10) comprises an outer pipe (12) for conveying combustive gas, and an inner pipe (14), coaxially arranged within the outer pipe (12), for conveying pulverized coal. The inner pipe (14) forms a separation wall for separating the pulverized coal from the combustive gas. The separation wall is at least partially discontinued in a region near the front end (11) of the lance (10), thereby forming a mixing region (16) within the pulverized coal injection lance (10). According to an important aspect of the invention, the outer pipe (12) and the inner pipe (14) have substantially the same length and wherein the inner pipe (14) comprises at least one lateral opening (18, 20) for allowing pulverized coal and combustive gas to come into contact within the pulverized coal injection lance (10) near the front end (11).

Abstract: The preliminary cleaning stage for a dust extraction installation for blast furnace gas is comprised of a large-sized cyclone which comprises a vertical pressurized tank. A gas furnace gas line arriving from the blast furnace is connected to an axial delivery device situated at the upper end of the pressurized tank. The delivery device is configured such that it introduces the blast furnace gas into the pressurized tank in an axial direction. A swirl device with guide vanes is positioned below the axial delivery device and causes the blast furnace gas which is axially introduced into the pressurized tank to swirl about the axis of the pressurized tank.