EP0594326B1 - Lance for introducing reactants into molten metal - Google Patents
Lance for introducing reactants into molten metal Download PDFInfo
- Publication number
- EP0594326B1 EP0594326B1 EP19930307955 EP93307955A EP0594326B1 EP 0594326 B1 EP0594326 B1 EP 0594326B1 EP 19930307955 EP19930307955 EP 19930307955 EP 93307955 A EP93307955 A EP 93307955A EP 0594326 B1 EP0594326 B1 EP 0594326B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lance
- inner tube
- tube
- outer tube
- outlet
- 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.)
- Expired - Lifetime
Links
Images
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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
Definitions
- This invention relates to a lance of the type used to introduce reactants into molten metal, e.g. steel, in a molten metal handling vessel.
- a lance may be used, for example, to introduce desulphurisation agents into molten steel.
- lances are usually of monolithic construction consisting of a thick-walled inner-tube of steel with welded reinforcement ribs of sectional steel and various types of holding elements and with barbed wire wrapped round to bind the refractory material. There is no air gap between the inner tube and the refractory material.
- a lance having inner and outer tubes, the outer tube being secured to and spaced from the inner tube by washers welded adjacent the ends of the outer tube.
- An unreinforced refractory sleeve is carried on the outer tube. Cooling gas is provided through a conduit between the inner and outer tubes.
- EP-A-0062217 is disclosed a lance having a tubular member encased in a sleeve of refractory material, with a number of longitudinally-extending reinforcing members arranged around the periphery of the tubular member.
- the reinforcing members are also encased in the refractory sleeve and they are spaced from the tubular member by spacer members positioned along the length of the tubular member, the spacer members being secured to the reinforcing members and to the tubular member, e.g. by welding.
- the aim of the operator of a desulphurisation unit is to optimise the total quantity of desulphurisation agent (kg per ton of hot metal) in order to reduce hot metal losses on the one hand and to minimise treatment times on the other hand.
- This can be achieved by using a higher grade desulphurising agent, i.e. a concentration of CaC 2 to Mg of up to 2:1 or by injecting pure magnesium.
- the present invention aims to improve the operating reliability and, hence, availability of a hot-metal unit by providing a lance which does not allow an excessively high temperature increase during use and which is relatively insensitive to the conditions of use while employing materials of different coefficients of expansion.
- the invention provides a lance having an inner tube and a refractory casing, the inner tube having an inlet adjacent one end and an outlet adjacent its other end, whereby reactant can be injected through the lance, the inner tube being spaced from an outer tube to provide an annular air gap between the two tubes, the refractory casing being provided on the outer tube, and a gas pipe extending between the inner and outer tubes, the gas pipe having its outlet adjacent the region of the outlet of the inner tube, whereby gas passing through the pipe can exit to atmosphere through the annular air gap, characterised in that the refractory casing has a steel reinforcement extending longitudinally and substantially parallel to the outer tube and the reinforcement is anchored only to the outlet end of the inner tube by anchor pieces.
- Cooling gas can, therefore, be delivered between the inner and outer tubes, which will normally be of steel, and to the region of the outlet of the nozzle.
- the gas tube will be fitted to extend around the inner-tube in a spiral configuration, at least for part of the length of the inner tube approaching and up to the outlet end.
- the gas pipe may extend parallel to the longitudinal axis of the tube.
- the objective of the invention is met by providing a lance of such a construction that it can be very effectively cooled with suitable delivery of cooling gas.
- the inner tube is conveniently mounted inside the outer tube by means of spacers, which in the preferred embodiment, will ensure that the two tubes are concentrically disposed.
- lance 10 has a thick-walled steel inner tube 11 with welded reinforcing ribs 12.
- Tube 11 is set in a refractory casing 13 for the proportion of its length that will be immersed in molten metal during use.
- the lance has an inlet 14 at the unencased end of tube 11, inlet 14 being connectable to a source of reactant to be injected.
- the other end of tube 11 has an outlet 15 which emerges into an outlet passageway 16 in the refractory casing, thereby forming the outlet of the lance.
- Figure 2 shows an improved lance 20 of the invention.
- This comprises a steel inner tube 21 extending inside and spaced from the walls of a steel outer tube 23 by spacers (not shown), and extending beyond outer tube 23 to its inlet end 22.
- Outer tube 23 has a protective refractory casing 25. The spacing of tubes 21 and 23 provides an annular air gap 24.
- inner tube 21 feeds to radially-disposed outlets 26, which extend through refractory casing 25 to the exterior of the lance.
- the cooling gas passed through pipe 27 therefore emerges in annular gap 24 adjacent the outlets of the lance and passes back along between the tubes 21 and 23 to exit at the opposite end of tube 23 to the nozzle outlet end, thereby cooling the whole of that portion of the lance that is immersed in molten metal in use.
- the inner tube 21 is well insulated, thus preventing uncontrolled heating of the inner tube if the cooling system breaks down.
- the refractory casing 25 has a steel reinforcement 28 which extends longitudinally and substantially parallel to tube 23.
- the reinforcement 28 is anchored to the outlet end only of inner tube 21 by anchor pieces 29. These are the only anchorage points used over the whole length of the refractory casing 25.
- this means of attachment allows the refractory casing and the outer tube to move freely in relation to one another as they expand or contract on heating or cooling without risk of cracking of the refractory material.
- Reinforcement 28 may be, for example, a number of longitudinally-extending steel bars spaced around and equidistant from the tube 23.
- the lance is preferably cooled with compressed air at a pressure, for example, of 6 bar.
- the passage of cooling gas is commenced as treatment of molten metal through the lance commences and will normally end a pre-determined time after the end of the treatment.
- the transport gas delivery line may, for example, be turned on three times. This mode of operation ensures that any loose deposits in the coveying line or in the lance are blown out. Magnesium particles already adhering to the lance wall and outlet orifices cannot be removed this way, however, and this is normally carried out mechanically, as far as such deposits can be reached.
- Magnesium residues can, however, be burnt off with air in the hot lance. This advantage can be utilised by using compressed air instead of nitrogen to clean the lance after treatment. An additional change- over valve from nitrogen to compressed air can be easily fitted for this purpose.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Description
- This invention relates to a lance of the type used to introduce reactants into molten metal, e.g. steel, in a molten metal handling vessel. Thus, a lance may be used, for example, to introduce desulphurisation agents into molten steel.
- Conventionally, lances are usually of monolithic construction consisting of a thick-walled inner-tube of steel with welded reinforcement ribs of sectional steel and various types of holding elements and with barbed wire wrapped round to bind the refractory material. There is no air gap between the inner tube and the refractory material.
- In US-A-4913735 is disclosed a lance having inner and outer tubes, the outer tube being secured to and spaced from the inner tube by washers welded adjacent the ends of the outer tube. An unreinforced refractory sleeve is carried on the outer tube. Cooling gas is provided through a conduit between the inner and outer tubes.
- In EP-A-0062217 is disclosed a lance having a tubular member encased in a sleeve of refractory material, with a number of longitudinally-extending reinforcing members arranged around the periphery of the tubular member. The reinforcing members are also encased in the refractory sleeve and they are spaced from the tubular member by spacer members positioned along the length of the tubular member, the spacer members being secured to the reinforcing members and to the tubular member, e.g. by welding.
- In hot-metal desulphurisation with desulphurising agents based on CaC2, the lance service lives achieved are considerably better than those using Mg-based desulphurisation agents. Thus, extensive industrial trials have been carried out in the past in order to find out what influencing factors are responsible for the reduced service lives of lances.
- The most important influencing factors, such as lance temperature, dwell time of desulphurising agent in the lance, conveying rates of desulphurisation agent and mixing of CaC2 to Mg, are now well known.
- The main prerequisite for long service life of a lance is still, as always, good, uniform conveyance of the desulphurising agent.
- Further influencing factors, as indicated, are the magnesium concentration and dwell time of the magnesium in the lance. At a mixing ratio CaC2 to Mg > 4:1 hardly any, or only very slight, caking occurs in the lance and in the region of the outlet orifices.
- The aim of the operator of a desulphurisation unit is to optimise the total quantity of desulphurisation agent (kg per ton of hot metal) in order to reduce hot metal losses on the one hand and to minimise treatment times on the other hand. This can be achieved by using a higher grade desulphurising agent, i.e. a concentration of CaC2 to Mg of up to 2:1 or by injecting pure magnesium.
- From a technical point of view it is possible to inject and convey minimum quantities of desulphurising agent. This can be achieved using sensitive conveying equipment with sophisticated measuring and controlling devices, which are available today. However, the injection lance is still a weak point in the whole conveying system.
- It is well known that the efficiency of the desulphurising agents depends on the dwell time of the individual particles in the melt, i.e. the lower the injection rate, the higher is the utilisation rate of the desulphurising agent.
- However, a low injection input with corresponding transport gas quantity, conflicts with the required long service life of the lance. Because of the low cooling effect of the desulphurising agent and the transport gas at low conveying rates, the lance heats up more quickly so that temperatures of up to 1000°C may be reached at the injection tube. This leads to caking of magnesium particles, which melt at approximately 650°C and may even cause vaporisation of magnesium in the lance. The logical consequences of this are higher wear of the refractory material and blockage of the lance, particularly with multiple orifice lances.
- The present invention aims to improve the operating reliability and, hence, availability of a hot-metal unit by providing a lance which does not allow an excessively high temperature increase during use and which is relatively insensitive to the conditions of use while employing materials of different coefficients of expansion.
- Accordingly, the invention provides a lance having an inner tube and a refractory casing, the inner tube having an inlet adjacent one end and an outlet adjacent its other end, whereby reactant can be injected through the lance, the inner tube being spaced from an outer tube to provide an annular air gap between the two tubes, the refractory casing being provided on the outer tube, and a gas pipe extending between the inner and outer tubes, the gas pipe having its outlet adjacent the region of the outlet of the inner tube, whereby gas passing through the pipe can exit to atmosphere through the annular air gap, characterised in that the refractory casing has a steel reinforcement extending longitudinally and substantially parallel to the outer tube and the reinforcement is anchored only to the outlet end of the inner tube by anchor pieces.
- Cooling gas can, therefore, be delivered between the inner and outer tubes, which will normally be of steel, and to the region of the outlet of the nozzle. In a preferred embodiment, the gas tube will be fitted to extend around the inner-tube in a spiral configuration, at least for part of the length of the inner tube approaching and up to the outlet end. For the remainder of the length of the inner tube, or at least for the remainder of the portion that extends inside the refractory encased outer tube, the gas pipe may extend parallel to the longitudinal axis of the tube.
- Thus, it can be seen that the objective of the invention is met by providing a lance of such a construction that it can be very effectively cooled with suitable delivery of cooling gas. The lance is based in a refractory fixture which is relatively insensitive to the conditions of use owing to the different coefficient of expansion of the lance materials used (steel:refractory = 10:1).
- The inner tube is conveniently mounted inside the outer tube by means of spacers, which in the preferred embodiment, will ensure that the two tubes are concentrically disposed.
- The invention will now be further described by way of example only with reference to the accompanying drawings in which:-
- Figure 1 is a longitudinal cross-section through a conventional prior art lance, and...
- Figure 2 is a longitudinal view in part-section of a lance of the invention.
- In Figure 1
lance 10 has a thick-walled steelinner tube 11 with welded reinforcingribs 12. Tube 11 is set in arefractory casing 13 for the proportion of its length that will be immersed in molten metal during use. The lance has aninlet 14 at the unencased end oftube 11,inlet 14 being connectable to a source of reactant to be injected. The other end oftube 11 has anoutlet 15 which emerges into anoutlet passageway 16 in the refractory casing, thereby forming the outlet of the lance. - Figure 2 shows an improved lance 20 of the invention. This comprises a steel
inner tube 21 extending inside and spaced from the walls of a steelouter tube 23 by spacers (not shown), and extending beyondouter tube 23 to itsinlet end 22.Outer tube 23 has a protectiverefractory casing 25. The spacing oftubes annular air gap 24. - At its other end,
inner tube 21 feeds to radially-disposedoutlets 26, which extend throughrefractory casing 25 to the exterior of the lance. - A
gas pipe 27, connectable to a source of cooling gas, passes longitudinally along the outside ofinner tube 21 betweentube 21 andouter tube 23. It endsadjacent outlets 26 so that the cooling effect of the gas is also felt by the outlets. The cooling gas passed throughpipe 27 therefore emerges inannular gap 24 adjacent the outlets of the lance and passes back along between thetubes tube 23 to the nozzle outlet end, thereby cooling the whole of that portion of the lance that is immersed in molten metal in use. - Furthermore, through the double-walled design the
inner tube 21 is well insulated, thus preventing uncontrolled heating of the inner tube if the cooling system breaks down. - The
refractory casing 25 has asteel reinforcement 28 which extends longitudinally and substantially parallel totube 23. Thereinforcement 28 is anchored to the outlet end only ofinner tube 21 byanchor pieces 29. These are the only anchorage points used over the whole length of therefractory casing 25. Thus, despite the very different coefficients of expansion of the steel components of the lance and the refractory casing, this means of attachment allows the refractory casing and the outer tube to move freely in relation to one another as they expand or contract on heating or cooling without risk of cracking of the refractory material.Reinforcement 28 may be, for example, a number of longitudinally-extending steel bars spaced around and equidistant from thetube 23. - In operation the lance is preferably cooled with compressed air at a pressure, for example, of 6 bar. The passage of cooling gas is commenced as treatment of molten metal through the lance commences and will normally end a pre-determined time after the end of the treatment.
- Usually the lance is cleaned with nitrogen after the treatment (the transport gas delivery line may, for example, be turned on three times). This mode of operation ensures that any loose deposits in the coveying line or in the lance are blown out. Magnesium particles already adhering to the lance wall and outlet orifices cannot be removed this way, however, and this is normally carried out mechanically, as far as such deposits can be reached.
- Magnesium residues can, however, be burnt off with air in the hot lance. This advantage can be utilised by using compressed air instead of nitrogen to clean the lance after treatment. An additional change- over valve from nitrogen to compressed air can be easily fitted for this purpose.
Claims (9)
- A lance (20) having an inner tube (21) and a refractory casing (25), the inner tube having an inlet (22) adjacent one end and an outlet (26) adjacent its other end, whereby reactant can be injected through the lance, the inner tube (21) being spaced from an outer tube (23) to provide an annular air gap (24) between the two tubes, the refractory casing (25) being provided on the outer tube (23) and a gas pipe (27) extending between the inner and outer tubes (21, 23), the gas pipe (27) having its outlet adjacent the region of the outlet (26) of the inner tube (21), whereby gas passing through the pipe (27) can exit to atmosphere through the annular air gap (24), characterised in that the refractory casing (25) has a steel reinforcement (28) extending longitudinally and substantially parallel to the outer tube (23) and the reinforcement (28) is anchored only to the outlet end of the inner tube (21) by anchor pieces (29).
- A lance according to Claim 1, characterised in that the inner tube (21) and outer tube (23) are of steel.
- A lance according to Claim 1 or 2, characterised in that the gas pipe (27) extends around the inner tube (21) in a spiral configuration.
- A lance according to Claim 3, characterised in that the gas pipe (27) extends around the inner tube (21) in a spiral configuration for a part of the length of the inner tube approaching and up to the outlet end (26) and extends parallel to the length of the inner tube (21) for the remainder of its length within the refractory encased outer tube (23).
- A lance according to any preceding claim, characterised in that the inner tube (21) is concentrically disposed within the outer tube (23) by means of spacers.
- A lance according to any preceding claim, characterised in that inner tube (21) leads to a plurality of radially-disposed outlets (26) which extend through the refractory casing (25) to the exterior of the lance.
- A lance according to any preceding claim, characterised in that gas passed through the pipe (27) emerges in the annular gap (24) adjacent the outlet (26) and passes back along between inner tube (21) and outer tube (23) to exit at the end of tube (23) opposite to the outlet end (26).
- A lance according to any preceding claim, characterised in that the reinforcement (28) comprises a number of longitudinally-extending steel bars spaced around and equidistant from the outer tube (23).
- A lance according to any preceding claim, characterised in that it is provided with a changeover valve whereby nitrogen or compressed air can be supplied through the lance for cleaning purposes.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB929221842A GB9221842D0 (en) | 1992-10-17 | 1992-10-17 | Lance |
GB9221842 | 1992-10-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0594326A1 EP0594326A1 (en) | 1994-04-27 |
EP0594326B1 true EP0594326B1 (en) | 1997-09-17 |
Family
ID=10723617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19930307955 Expired - Lifetime EP0594326B1 (en) | 1992-10-17 | 1993-10-06 | Lance for introducing reactants into molten metal |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0594326B1 (en) |
DE (1) | DE69313971T2 (en) |
ES (1) | ES2109444T3 (en) |
FI (1) | FI100726B (en) |
GB (1) | GB9221842D0 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109210936A (en) * | 2018-10-18 | 2019-01-15 | 江苏新春兴再生资源有限责任公司 | A kind of side-blown spray gun and application method of smelting furnace |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE0501839L (en) * | 2005-08-19 | 2006-09-26 | Aga Ab | Lance for use in combustion and lance manufacturing process |
CN109458849A (en) * | 2019-01-07 | 2019-03-12 | 姚清清 | A kind of spray gun |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3271111D1 (en) * | 1981-04-02 | 1986-06-19 | Mono Constr | Metallurgical lance |
DE3423192A1 (en) * | 1984-06-22 | 1986-01-02 | Krupp Polysius Ag, 4720 Beckum | Submerged lance |
DE3501970A1 (en) * | 1985-01-22 | 1986-07-24 | Plibrico Co GmbH, 4000 Düsseldorf | Lance for treating crude iron or steel |
BE1000803A7 (en) * | 1987-08-07 | 1989-04-11 | Centre Rech Metallurgique | Cooled submerged injection nozzle |
US4913735A (en) * | 1989-02-09 | 1990-04-03 | Palmer Manufacturing & Supply, Inc. | Flux injector lance for use in processing aluminum and method |
-
1992
- 1992-10-17 GB GB929221842A patent/GB9221842D0/en active Pending
-
1993
- 1993-10-06 DE DE1993613971 patent/DE69313971T2/en not_active Expired - Lifetime
- 1993-10-06 EP EP19930307955 patent/EP0594326B1/en not_active Expired - Lifetime
- 1993-10-06 ES ES93307955T patent/ES2109444T3/en not_active Expired - Lifetime
- 1993-10-15 FI FI934562A patent/FI100726B/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109210936A (en) * | 2018-10-18 | 2019-01-15 | 江苏新春兴再生资源有限责任公司 | A kind of side-blown spray gun and application method of smelting furnace |
WO2020077960A1 (en) * | 2018-10-18 | 2020-04-23 | 江苏新春兴再生资源有限责任公司 | Side blowing lance for smelting furnace and use method |
Also Published As
Publication number | Publication date |
---|---|
ES2109444T3 (en) | 1998-01-16 |
GB9221842D0 (en) | 1992-12-02 |
FI934562A (en) | 1994-04-18 |
DE69313971T2 (en) | 1998-03-19 |
DE69313971D1 (en) | 1997-10-23 |
FI100726B (en) | 1998-02-13 |
EP0594326A1 (en) | 1994-04-27 |
FI934562A0 (en) | 1993-10-15 |
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