Paul Wurth S.a.

Paul Goedert

Georges Stamatakis

Emile Lonardi

Guy Thillen

Karl-Rudolf Hegemann

Lionel Hausemer

Jean-Paul Simoes

Yvan Kroemmer

Bernard Cauwenberghs

Christian Lunkes

Pol Lemmer

Markus Mayer

Ken Edward

Francis Pott

Tuyere stock arrangement () of a blast furnace comprising a tuyere () having a tuyere body () configured for installation in a blast furnace wall (); the tuyere body () having an outer wall (), a front face () and a rear face (), the tuyere body () further having a tuyere channel () extending from the rear face () to the front face (), the tuyere channel () forming an inner wall () in the tuyere body (). The tuyere stock arrangement () further comprises a blowpipe () connected between the rear face () of the tuyere body () and a gas feeding device (), the blowpipe () being configured and arranged so as to feed hot gas, generally hot blast air, from the gas feeding device () to the tuyere channel () for injection into the blast furnace. The tuyere stock arrangement () also comprises an injection lance () for feeding a combustible, generally pulverized or granular coal, into the blast furnace at the tuyere level, the injection lance () being an coaxial lance comprising an outer pipe and an inner pipe, coaxially arranged within the outer pipe, the outer and inner pipes being arranged for separately conveying oxidizing gas and said combustible, the inner pipe forming a separation wall for separating said combustible from the oxidizing gas. According to an important aspect of the invention, the injection lance () is removably arranged in a lance passage () formed in the tuyere body (), the lance passage () being arranged between the inner wall () and the outer wall () of the tuyere body () and extending from the rear face () to the front face (), the lance passage () opening into a front lace () of the tuyere body ().

Tuyere stock arrangement for a blast furnace and method for feeding hot blast into a blast furnace

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 () for blowing hot blast air from a bustle pipe () into a furnace hearth of a blast furnace through a tuyere () in an opening in the furnace wall (); providing a pulverised coal injection lance () for feeding pulverised coal into the tuyere (), the pulverised coal injection lance () comprising an inner pipe () for conveying pulverised coal and an outer pipe (), coaxially arranged around the inner pipe (), for conveying combustive gas, the inner pipe () forming a separation wall for separating the pulverised coal from the combustive gas, the pulverised coal injection lance () having a lance tip () arranged in the tuyere (); allowing the pulverised coal and the combustive gas to form a mixture of pulverised coal and combustive gas at the lance tip (); burning the mixture of pulverised coal and combustive gas in the tuyere (); monitoring whether or not a flame at the lance tip () is burning; and upon determination that the flame at the lance tip () is not burning, reigniting the flame by temporarily reducing the flow of combustive gas through the pulverised coal injection lance ().

Method for feeding pulverised coal into a blast furnace

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. According to an important aspect of the present invention, the step of providing the drying gas includes feeding a variable flow rate of hot stove waste gas to the hot gas generator through a hot stove waste gas line so as to maximize the amount of hot stove waste gas used as drying gas. A pressure of the drying gas at a pulverizer gas inlet is controlled by regulating a flow rate of the hot stove waste gas through the hot stove waste gas line.

Method of producing pulverized coal

The present invention proposes a pulverized coal injection lance () for feeding pulverized coal from a rear end of the lance () to a front end () of the lance (). The lance () comprises an outer pipe () for conveying combustive gas, and an inner pipe (), coaxially arranged within the outer pipe (), for conveying pulverized coal. The inner pipe () 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 () of the lance (), thereby forming a mixing region () within the pulverized coal injection lance (). According to an important aspect of the invention, the outer pipe () and the inner pipe () have substantially the same length and wherein the inner pipe () comprises at least one lateral opening () for allowing pulverized coal and combustive gas to come into contact within the pulverized coal injection lance () near the front end ().

Pulverized coal injection lance

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.

Dust extraction installation for blast furnace gas

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Mondorf-les-Bains, Luxembourg

Paul Goedert