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WO2007021238A1 - Lance to be used during combustion - Google Patents

Lance to be used during combustion Download PDF

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Publication number
WO2007021238A1
WO2007021238A1 PCT/SE2006/050277 SE2006050277W WO2007021238A1 WO 2007021238 A1 WO2007021238 A1 WO 2007021238A1 SE 2006050277 W SE2006050277 W SE 2006050277W WO 2007021238 A1 WO2007021238 A1 WO 2007021238A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
ceramic layer
lance
play
caused
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2006/050277
Other languages
French (fr)
Inventor
Tomas Ekman
Lennart Rangmark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde Sverige AB
Original Assignee
AGA AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AGA AB filed Critical AGA AB
Publication of WO2007021238A1 publication Critical patent/WO2007021238A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/07021—Details of lances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00018—Means for protecting parts of the burner, e.g. ceramic lining outside of the flame tube
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a lance that is to be used to inject gases at a high flow rate, which gases are intended to react with and in this way solve the problem caused by NO x -gases during the combustion of fossil fuels.
  • NO x -gases are formed during the combustion of fossil fuels, and it is desired to eliminate these gases.
  • the elimination is carried out by injecting gases at a high flow rate into a region of combustion. These gases are injected through lances that are located at a distance from each other with nozzles placed directly adjacent to the high-temperature zone of the combustion.
  • the nozzle is not cooled by any other method than a certain cooling that is obtained from the flow of gases that is injected.
  • Metal lances are currently used.
  • the gases are injected intermittently, that is, they are injected with an on/off-effect, and this causes problems with varying temperatures of the lance and the nozzles - a high temperature when the gases are not flowing and a lower temperature when the gases flow through the lances and the nozzles.
  • the complete unit of lances and nozzles is subjected to thermal stress, to high temperatures, and to hot, corrosive and abrasive mixtures of gases and particles.
  • the problem of using metal lances is that thermal loading, exhaustion and stress produce accelerated oxidation and de- formation that is induced by stress.
  • One solution up until now has been the use of ceramic lances.
  • the problem with ceramic lances is that they are difficult to manufacture with acceptable tolerances, and that they are subject to the formation of cracks that can cause catastrophic failure of the unit. Furthermore, it can be difficult to 5 manufacture accessories for the connection of gas supply to these ceramic lances.
  • the present invention eliminates or significantly reduces these problems. 10
  • the aim of the present invention is to join together a lance comprising a metallic core and a ceramic layer and in this way to form a composite lance.
  • the present invention thus relates to a lance to be used during the injection of gases during combustion, comprising a channel within the lance through which it is intended that gas is to flow, and it is characterised in that the lance is a composite comprising a core of a metallic material and a
  • the invention relates to a method of the type and having the principal characteristics that are specified in claim 3.
  • the invention is described in more detail below, partially with reference to an embodiment shown in the attached drawings, where
  • FIG. 1 shows a composite lance where a ceramic layer has been sintered directly onto a metal core with play between the core and the layer;
  • FIG. 2 shows a preformed ceramic layer applied to the metal core by glue with play between them;
  • Figure 3 shows a composite lance with a thicker ceramic layer than that shown in Figures 1 and 2.
  • the present invention concerns a lance 1 for use during the injection of gases during combustion.
  • the lance comprises a channel 2 within the lance 1, through which it is intended that gas should flow.
  • the lance 1 is a composite lance comprising a core 3 of a metallic material and a ceramic layer 4 outside of the core 3.
  • the outer surface of the core 3 is arranged with a region 7 of smaller diameter surrounded by regions 6, 9 with larger diameters.
  • the ceramic layer 4 is arranged outside of the core 3 with play 5 between the outer surface of the core 3 and the inner surface of the ceramic layer 4. The play 5 prevents the ceramic layer 4 from forming cracks due to differences in expansion between the core 3 and the layer 4 when subject to changes in temperature, see Figure 1.
  • the metallic core 3 is manufactured from, for example, stainless steel or ODS (Oxide Dispersion Strengthened) material. Both the region 7 with the .smaller diameter and the region 6 with the larger diameter are covered by the ceramic layer 4.
  • the ceramic layer 4 may preferably be manufactured from SiC.
  • the present invention further refers to a method for the manufacture of a lance 1 to be used during the injection of gases during combustion, comprising a channel 2 within the lance 1 through which it is intended that gas should flow.
  • the lance 1 is caused to be formed as a composite lance that comprises a core 3 of a metallic material and a ceramic layer 4 outside of the core 3.
  • the outer surface of the core 3 is caused to have a region 7 with a smaller diameter surrounded by regions 6, 9 with larger diameters.
  • the ceramic layer 4 is caused to be attached outside of the core 3 with play 5 between the outer surface of the core 3 and the inner surface of the ceramic layer 4, whereby the play 5 prevents the ceramic layer 4 from forming cracks due to the difference in expansion between the metallic core 3 and the ceramic layer 4 when temperature changes take place in the lance 1.
  • the play 5 between the core 3 and the ceramic layer 4 is caused to be arranged with the aid of a material that melts or burns and is vaporised at a temperature that is lower than the melting point of the metallic core 3.
  • the material is a polymer-based or a paper-based material, such as, for example, masking tape.
  • the ceramic layer 4 is applied outside of the said material, which is applied outside of the core 3, after which the ceramic layer 4 is caused to be sintered.
  • the ceramic layer 4 is arranged to be sintered to its final form and after this to be slid onto the core 3.
  • Glue 8 is subsequently caused to be arranged between the metallic core 3 and the ceramic layer 4 with play 5 between the metallic core 3 and the glue, see Figure 2.
  • the glue 8 is a ceramic glue that is caused to be sintered after the ceramic layer 4 has been slid onto the metallic core 3.
  • Figure 3 shows a metallic core 3 with a ceramic layer 4 that is thicker than the layer shown in Figures 1 and 2.
  • the layer 4 may have a varying thickness without deviating from the aim of the invention.
  • a material such as mask- ing tape
  • the choice of the thickness of the tape and the choice of the- number of times the tape is to be wound around the core 3 depend on the thickness of the play 5 that is desired for the completed composite lance 1.
  • a ceramic powder such as AI 2 O 3 or SiO 2 is subsequently applied outside of the tape, the powder is pressed to form a green body and then sintered. During the raise in temperature that occurs in association with the sintering, the tape melts or burns. The tape melts or burns, however, and is vaporised at a temperature that is lower than the sintering temperature of the ceramic material.
  • the vapours from the tape find their way out where the play 5 between the core 3 and the layer 4 meets the surroundings, see reference number 10 in Figure 1.
  • the green body Before the tape has become vaporised, the green body has adopted its shape in the form of a porous layer 4, and it retains for this reason its shape when the tape has been vaporised, rather than being sintered such that it lies in contact with the core 3.
  • a metallic core 3 After the sin- tering process has been carried out, a metallic core 3 is obtained with a ceramic layer 4, between which play 5 has formed.
  • the play 5 ensures that the ceramic layer 4 is not sensitive to the difference in coefficient of expansion for the metallic material that is used in the metallic core 3.
  • the ceramic layer 4 is sintered separately in its final form, with the form of a hollow cylinder.
  • the inner diameter of the ceramic layer 4 is adapted such that it can be slid onto a core 3 that is covered with tape.
  • Ceramic glue 8 is applied to the tape before the layer 4 is slid onto the core 3.
  • the layer 4 is subsequently slid onto the core 3, which is surrounded by the tape and the glue 8, and this is followed by sintering in order to form the glue 8 according to the outer surface of the tape and the inner surface of the layer 4, and in order to vaporise the tape. Play 5 is thus formed also by this method, see Figure 2.
  • the lance 1 comprising the channel 2, the core 3, the layer 4, play 5 and the glue 8 may be designed in another suitable manner without deviating from the fundamental idea of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Laminated Bodies (AREA)

Abstract

A lance (1) for use during the injection of gases during combustion, comprising a channel (2) within the lance (1) throug which it is intended that gas should flow. The invention is characterised in that the lance (1) is a composite lance comprising a core (3) of a metallic material and a ceramic layer (4) outside of the core (3), in that the outer surface of the core (3) is arranged with a region (7) with a smaller diameter surrounded by regions (6, 9) with larger diameters, and in that the ceramic layer (4) is arranged outside of the core (3) with play (5) between the outer surface of the core (3) and the inner surface of the ceramic layer (4), whereby the play (5) prevents the ceramic layer (4) from forming cracks due to differences in expansion between the core and the layer when temperature changes take place.

Description

Lance to be Used during Combustion
The present invention relates to a lance that is to be used to inject gases at a high flow rate, which gases are intended to react with and in this way solve the problem caused by NOx-gases during the combustion of fossil fuels.
NOx-gases are formed during the combustion of fossil fuels, and it is desired to eliminate these gases. The elimination is carried out by injecting gases at a high flow rate into a region of combustion. These gases are injected through lances that are located at a distance from each other with nozzles placed directly adjacent to the high-temperature zone of the combustion. As a result of the simplicity of the design and for reasons of economy, the nozzle is not cooled by any other method than a certain cooling that is obtained from the flow of gases that is injected. Metal lances are currently used.
The gases are injected intermittently, that is, they are injected with an on/off-effect, and this causes problems with varying temperatures of the lance and the nozzles - a high temperature when the gases are not flowing and a lower temperature when the gases flow through the lances and the nozzles. The complete unit of lances and nozzles is subjected to thermal stress, to high temperatures, and to hot, corrosive and abrasive mixtures of gases and particles.
The problem of using metal lances is that thermal loading, exhaustion and stress produce accelerated oxidation and de- formation that is induced by stress. One solution up until now has been the use of ceramic lances. The problem with ceramic lances is that they are difficult to manufacture with acceptable tolerances, and that they are subject to the formation of cracks that can cause catastrophic failure of the unit. Furthermore, it can be difficult to 5 manufacture accessories for the connection of gas supply to these ceramic lances.
The present invention eliminates or significantly reduces these problems. 10
The aim of the present invention is to join together a lance comprising a metallic core and a ceramic layer and in this way to form a composite lance.
15 The present invention thus relates to a lance to be used during the injection of gases during combustion, comprising a channel within the lance through which it is intended that gas is to flow, and it is characterised in that the lance is a composite comprising a core of a metallic material and a
20 ceramic layer outside of the core, in that the outer surface of the core is arranged with a region that has a smaller diameter surrounded by regions that have larger diameters, and in" that the ' ceramic layer 'is arranged outside of the core with play between the outer surface of the core and the inner
25 surface of the ceramic layer, whereby the play prevents the ceramic layer from forming cracks due to the difference in expansion between the core and the layer when subject to change of temperature.
30. Furthermore, the invention relates to a method of the type and having the principal characteristics that are specified in claim 3. The invention is described in more detail below, partially with reference to an embodiment shown in the attached drawings, where
- Figure 1 shows a composite lance where a ceramic layer has been sintered directly onto a metal core with play between the core and the layer;
- Figure 2 shows a preformed ceramic layer applied to the metal core by glue with play between them;
- Figure 3 shows a composite lance with a thicker ceramic layer than that shown in Figures 1 and 2.
The present invention concerns a lance 1 for use during the injection of gases during combustion. The lance comprises a channel 2 within the lance 1, through which it is intended that gas should flow.
According to the invention, the lance 1 is a composite lance comprising a core 3 of a metallic material and a ceramic layer 4 outside of the core 3. The outer surface of the core 3 is arranged with a region 7 of smaller diameter surrounded by regions 6, 9 with larger diameters. The ceramic layer 4 is arranged outside of the core 3 with play 5 between the outer surface of the core 3 and the inner surface of the ceramic layer 4. The play 5 prevents the ceramic layer 4 from forming cracks due to differences in expansion between the core 3 and the layer 4 when subject to changes in temperature, see Figure 1.
The metallic core 3 is manufactured from, for example, stainless steel or ODS (Oxide Dispersion Strengthened) material. Both the region 7 with the .smaller diameter and the region 6 with the larger diameter are covered by the ceramic layer 4. The ceramic layer 4 may preferably be manufactured from SiC.
The present invention further refers to a method for the manufacture of a lance 1 to be used during the injection of gases during combustion, comprising a channel 2 within the lance 1 through which it is intended that gas should flow.
According to one preferred embodiment, the lance 1 is caused to be formed as a composite lance that comprises a core 3 of a metallic material and a ceramic layer 4 outside of the core 3. The outer surface of the core 3 is caused to have a region 7 with a smaller diameter surrounded by regions 6, 9 with larger diameters. The ceramic layer 4 is caused to be attached outside of the core 3 with play 5 between the outer surface of the core 3 and the inner surface of the ceramic layer 4, whereby the play 5 prevents the ceramic layer 4 from forming cracks due to the difference in expansion between the metallic core 3 and the ceramic layer 4 when temperature changes take place in the lance 1.
According to one preferred method, the play 5 between the core 3 and the ceramic layer 4 is caused to be arranged with the aid of a material that melts or burns and is vaporised at a temperature that is lower than the melting point of the metallic core 3.
According to a further preferred method, the material is a polymer-based or a paper-based material, such as, for example, masking tape. According to a preferred method, the ceramic layer 4 is applied outside of the said material, which is applied outside of the core 3, after which the ceramic layer 4 is caused to be sintered.
According to a further preferred method, the ceramic layer 4 is arranged to be sintered to its final form and after this to be slid onto the core 3. Glue 8 is subsequently caused to be arranged between the metallic core 3 and the ceramic layer 4 with play 5 between the metallic core 3 and the glue, see Figure 2.
According to a further preferred method, the glue 8 is a ceramic glue that is caused to be sintered after the ceramic layer 4 has been slid onto the metallic core 3.
Figure 3 shows a metallic core 3 with a ceramic layer 4 that is thicker than the layer shown in Figures 1 and 2. Thus the layer 4 may have a varying thickness without deviating from the aim of the invention. The thicker the layer 4 is, the better is the temperature stability provided for the metallic core 3.
According to one preferred method, a material, such as mask- ing tape, is wound around the metallic core 3. The choice of the thickness of the tape and the choice of the- number of times the tape is to be wound around the core 3 depend on the thickness of the play 5 that is desired for the completed composite lance 1. A ceramic powder such as AI2O3 or SiO2 is subsequently applied outside of the tape, the powder is pressed to form a green body and then sintered. During the raise in temperature that occurs in association with the sintering, the tape melts or burns. The tape melts or burns, however, and is vaporised at a temperature that is lower than the sintering temperature of the ceramic material. The vapours from the tape find their way out where the play 5 between the core 3 and the layer 4 meets the surroundings, see reference number 10 in Figure 1. Before the tape has become vaporised, the green body has adopted its shape in the form of a porous layer 4, and it retains for this reason its shape when the tape has been vaporised, rather than being sintered such that it lies in contact with the core 3. After the sin- tering process has been carried out, a metallic core 3 is obtained with a ceramic layer 4, between which play 5 has formed. The play 5 ensures that the ceramic layer 4 is not sensitive to the difference in coefficient of expansion for the metallic material that is used in the metallic core 3. Since there is a difference between the coefficient of expansion of the metallic core 3 and that of the ceramic layer 4, cracks would otherwise form when the core 3 expands, which takes place when the core 3 is subject to changes in temperature. The layer 4 is retained in place around the core 3 in that the core 3 is provided with a region 6 with larger diameter and the ceramic layer 4 cannot slide off of the metallic core 3 for this reason.
According to a further method, 'this is similar to the method describe above with the difference that the ceramic layer 4 is sintered separately in its final form, with the form of a hollow cylinder. The inner diameter of the ceramic layer 4 is adapted such that it can be slid onto a core 3 that is covered with tape. Ceramic glue 8 is applied to the tape before the layer 4 is slid onto the core 3. The layer 4 is subsequently slid onto the core 3, which is surrounded by the tape and the glue 8, and this is followed by sintering in order to form the glue 8 according to the outer surface of the tape and the inner surface of the layer 4, and in order to vaporise the tape. Play 5 is thus formed also by this method, see Figure 2.
A number of embodiments and uses have been described above, However, the lance 1 comprising the channel 2, the core 3, the layer 4, play 5 and the glue 8 may be designed in another suitable manner without deviating from the fundamental idea of the invention.
Thus the present invention is not limited to the embodiments described above: it can be varied within the framework specified by the attached patent claims.

Claims

Claims
1. A lance (1) for use during the injection of gases during combustion, comprising a channel (2) within the lance (1) through which it is intended that gas should flow, characterised in that the lance (1) is a composite lance comprising a core (3) of a metallic material and a ceramic layer (4) outside of the core (3), in that the outer surface of the core (3) is arranged with a region (7) with a smaller diameter surrounded by regions (6, 9) with larger diameters, and in that the ceramic layer (4) is arranged outside of the core (3) with play (5) between the outer surface of the core
(3) and the inner surface pf the ceramic layer (4), whereby the play (5) prevents the ceramic layer (4) from forming cracks due to differences in expansion between the core (3) and the layer (4) when temperature changes take place.
2. The lance (1) according to claim 1, characterised in that both the region (7) of lower diameter and the region (6) with larger diameter are covered by the ceramic layer
(4) .
3. A method for the manufacture of a lance (1) to be used during the injection of gases during combustion, comprising a channel (2) within the lance (1) through which it is intended that gas is to flow, characterised in that the lance (1) is caused to be formed as a composite lance comprising a core (3) of a metallic material and a ceramic layer (4) outside of the core (3) , in that the outer surface of the core (3) is caused to have a region (7) with a smaller diameter surrounded by regions (6, 9) with larger diameters, in that the ceramic layer (4) is caused to be attached outside of the core (3) with play (5) between the outer surface of the core (3) and the inner surface of the ceramic layer (4) , whereby the play (5) prevents the ceramic layer (4) from forming cracks due to differences in expansion between the core (3) and the ceramic layer (4) during changes of temperature in the lance (1) .
4. The . method according to claim 3, characterised in that the play (5) between the core (3) and the layer (4) is caused to be arranged with the aid of a material that burns or melts and is vaporised at a temperature that is lower than the melting point of the metallic core (3) .
5. The method according to claim 4, characterised in that the material is a polymer-based or a paper-based material.
6. The method according to any one of claims 3 to 5, characterised in that the ceramic layer (4) is applied outside of the said material outside of the core (3), after which the ceramic layer (4) is caused to be sintered.
7. The method according to any one of claims 3 to 5, characterised in that the ceramic layer (4) is arranged to be sintered to its final form and subsequently slid onto the core (3) and in that glue (8) is caused to be arranged between the metallic core (3) and the ceramic layer (4) with play (5) between the metallic core (3) and the glue (8) .
8. The method according to claim 7, characterised in that the glue (8) is a ceramic glue that is caused to sinter after the ceramic layer (4) has been slid onto the core (3) .
PCT/SE2006/050277 2005-08-19 2006-08-04 Lance to be used during combustion Ceased WO2007021238A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0501839A SE0501839L (en) 2005-08-19 2005-08-19 Lance for use in combustion and lance manufacturing process
SE0501839-5 2005-08-19

Publications (1)

Publication Number Publication Date
WO2007021238A1 true WO2007021238A1 (en) 2007-02-22

Family

ID=37054377

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/050277 Ceased WO2007021238A1 (en) 2005-08-19 2006-08-04 Lance to be used during combustion

Country Status (3)

Country Link
US (1) US20070040308A1 (en)
SE (1) SE0501839L (en)
WO (1) WO2007021238A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0501840L (en) * 2005-08-19 2007-02-20 Aga Ab Procedure as well as for monitoring a burner
US8920711B2 (en) 2012-07-20 2014-12-30 Specialty Minerals (Michigan) Inc. Lance for wire feeding
EP3922736A1 (en) * 2020-06-08 2021-12-15 ImerTech SAS Blast lance for gas blowing, its use and method of production

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0232648A1 (en) * 1985-12-26 1987-08-19 Daussan Et Compagnie Injection lance for a metallurgical vessel and process for its fabrication
US4750716A (en) * 1986-04-04 1988-06-14 Ashland Oil, Inc. Injection lance
EP0594326A1 (en) * 1992-10-17 1994-04-27 Foseco International Limited Lance for inrtroducing reactants into molten metal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3508618A1 (en) * 1985-03-29 1986-09-18 Vasipari Kutató és Fejlesztö Vállalat, Budapest BLOWING TREATMENT FOR TREATING METAL MELT IN MILL PLANTS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0232648A1 (en) * 1985-12-26 1987-08-19 Daussan Et Compagnie Injection lance for a metallurgical vessel and process for its fabrication
US4750716A (en) * 1986-04-04 1988-06-14 Ashland Oil, Inc. Injection lance
EP0594326A1 (en) * 1992-10-17 1994-04-27 Foseco International Limited Lance for inrtroducing reactants into molten metal

Also Published As

Publication number Publication date
US20070040308A1 (en) 2007-02-22
SE528209C2 (en) 2006-09-26
SE0501839L (en) 2006-09-26

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