Paul Wurth S.a.

Paul Wurth Refractory & Engineering Gmbh

Other

Paul Wurth Deutschland Gmbh

Jean-Paul Simoes

Lionel Hausemer

Paul Tockert

Jeannot Loutsch

Jean-Luc Roth

Nicolas Maggioli

Friedrich Eschmann

Nicolas Mousel

Manfred Moller

Rudolf Hebel

Paul Goedert

Ralf Allmannsdörfer

Johannes Münzer

Sylvia Heilhecker

Manfred Möller

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.

Bustle pipe arrangement

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.

Method of operating regenerative heaters in blast furnace plant

Tuyere stock arrangement of a blast furnace includes a tuyere body configured for installation in a shaft furnace wall. The tuyere body includes a front face facing an interior of the shaft furnace and an opposite rear face and a tuyere channel extending between the rear and front faces (). The stock arrangement includes a blowpipe between the rear face and a hot blast air supply system, the blowpipe having a front portion connecting to the tuyere body and an opposite rear portion connecting to the hot blast air supply system. A fuel injection lance is arranged through the tuyere body and feeds fuel into the shaft furnace. A gas injection lance feeds an oxidizing gas to the shaft furnace and is arranged in the rear portion of the blowpipe to feed oxidizing gas into a central portion of a stream of hot blast air fed through the blowpipe.

Tuyere stock arrangement of a blast furnace

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 invention proposes an arrangement for burning blast furnace off-gas from a bleeder valve. It comprises a bleeder valve () having a fixed hollow valve body () defining an outlet () and a valve seat and a movable obturator () that cooperates with the valve seat for closing the bleeder valve and releasing blast furnace off-gas through the outlet. The arrangement includes an apparatus for combustion of blast furnace off-gas released by the bleeder valve (). This apparatus is characterized by an ignition device () that is arranged on or adjacent the valve body or the moveable obturator of the bleeder valve () itself. The ignition device () has its spatial ignition range located downstream the outlet in a region where blast furnace off-gas released through the outlet mixes with ambient air when the obturator is in an open position so as to allow open-air combustion of blast furnace off-gas released into ambient air at the location of the bleeder valve.

Arrangement for burning blast furnace off-gas from a bleeder valve and corresponding bleeder valve

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.

Device for regulating the temperature of a gas in a hot gas main

The present invention proposes a method for feeding a burden to a blast furnace (), wherein the method comprises providing a charging device () having at least one material hopper (), the material hopper () comprising a hopper chamber (), a material inlet aperture for feeding a burden into the hopper chamber (), and a material discharge aperture for feeding a burden from the hopper chamber () to the blast furnace (); the material inlet aperture having an associated inlet seal valve) for opening and closing the material inlet aperture and the material discharge aperture having an associated material discharge valve () for opening and closing the material discharge aperture. The method further comprises opening the material inlet aperture and closing the material discharge aperture; feeding a burden into the hopper chamber () through the material inlet aperture; closing the inlet seal valve (); pressurizing the hopper chamber () by feeding pressurizing gas into the hopper chamber (); and opening the material discharge valve () and feeding the burden from the hopper chamber () to the blast furnace (). According to an important aspect of the invention, the method further comprises subjecting at least a portion of a top gas recovered from the blast furnace () to a recycling process wherein carbon dioxide is removed from the recovered top gas; and feeding at least a portion of the recovered carbon dioxide as pressurizing gas into the hopper chamber () for pressurizing the hopper chamber ().

Method for feeding a burden to a blast furnace

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.

A method for operating a regenerative heater including a first chamber and a second chamber, the first chamber having a burner arranged therein, the second chamber having heat storage means; the method including: a heating cycle where fuel and oxidizing gas are fed to the burner of the first chamber and allowed to burn and where hot flue gasses are led through the second chamber to heat the heat storage means; and a blowing cycle where a process gas is fed through the second chamber to pick up heat from the heat storage means where the heating cycle includes the following steps: feeding a first stream of fuel to the burner of the regenerative heater; feeding a second stream of fuel to a pre-combustion chamber; feeding oxygen to the pre-combustion chamber; allowing the second stream of fuel and the oxygen to interact so as to form oxidizing gas; feeding the oxidizing gas to the burner of the regenerative heater, where, at the end of the heating cycle, the supply of oxygen to the pre-combustion chamber is discontinued, while further feeding the second stream of fuel to the pre-combustion chamber and further feeding the first stream of fuel to the burner.

Method for operating a regenerative heater

The present invention proposes a method for feeding hot gas to a shaft furnace (), wherein the method comprises feeding a first portion () of a first gas flow () to a mixing chamber () and feeding a second portion () of the first gas flow () into said shaft furnace. The method further comprises feeding a second gas flow () to the mixing chamber (), allowing the first portion () of the first gas flow () to mix with the second gas flow () in the mixing chamber (), thereby forming a third gas flow (), and feeding the third gas flow () to the shaft furnace (). The first gas flow () has a first volumetric fluid flow rate (V), a first temperature (T) and a first pressure (p); the second gas flow () has a second volumetric fluid flow rate (V), a second temperature (T) and a second pressure (p); and the third gas flow () has a third volumetric fluid flow rate (V), a third temperature (T) and a third pressure (p). According to an important aspect of the present invention, the first temperature (T) is higher than the second temperature (T) and the first pressure (p) is lower than the second pressure (p) and the third temperature (T) is regulated by controlling the second pressure (p).

Method for feeding hot gas to a shaft furnace

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&#xb0; C., and thereby producing devolatized carbonaceous material and synthesis gas, and allowing the devolatized carbonaceous material and synthesis gas to react with the recovered top gas.

Method for operating a blast furnace and blast furnace installation

The present invention proposes a method for feeding a burden to a blast furnace (), wherein the method comprises providing a charging device () having at least one material hopper (), the material hopper () comprising a hopper chamber (), a material inlet aperture for feeding a burden into the hopper chamber (), and a material discharge aperture for feeding a burden from the hopper chamber () to the blast furnace (); the material inlet aperture having an associated inlet seal valve) for opening and closing the material inlet aperture and the material discharge aperture having an associated material discharge valve () for opening and closing the material discharge aperture. The method further comprises opening the material inlet aperture and closing the material discharge aperture; feeding a burden into the hopper chamber () through the material inlet aperture; closing the inlet seal valve (); pressurizing the hopper chamber () by feeding pressurizing gas into the hopper chamber (); and opening the material discharge valve () and feeding the burden from the hopper chamber () to the blast furnace (). According to an important aspect of the invention, the method comprises feeding a predetermined amount of pressurized flushing gas through the hopper chamber () before pressurizing the hopper chamber (), wherein the flushing gas comprises at least 75% carbon dioxide.

Growing community of inventors

Walferdange, Luxembourg

Jean-Paul Simoes