CA1258371A - Air cooled refractory lance - Google Patents
Air cooled refractory lanceInfo
- Publication number
- CA1258371A CA1258371A CA000490034A CA490034A CA1258371A CA 1258371 A CA1258371 A CA 1258371A CA 000490034 A CA000490034 A CA 000490034A CA 490034 A CA490034 A CA 490034A CA 1258371 A CA1258371 A CA 1258371A
- Authority
- CA
- Canada
- Prior art keywords
- tubular
- refractory body
- lance
- bath
- elongated
- 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
Links
- 239000002184 metal Substances 0.000 claims abstract description 50
- 229910052751 metal Inorganic materials 0.000 claims abstract description 50
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000007670 refining Methods 0.000 claims abstract description 5
- 239000002826 coolant Substances 0.000 claims abstract 9
- 239000011819 refractory material Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 2
- 240000008100 Brassica rapa Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A fluid cooled lance has an elongated tubular refractory body with a pair of tubular members arranged coaxially therein, one of said tubular members having longitudinally extending configurations which engage the inner surface of said refractory body, the other tubular member being disposed within the first mentioned tubular member engaging the inner surfaces of said longitudinally extending configurations thereof so as to form a plurality of separate longitudinally extending passageways, said tubular members forming means for introducing a coolant fluid into the lance and directing said coolant fluid therefrom, a secondary tubular member in said elongated tubular refractory body communicating with the opposite ends thereof and means for introducing stirring and refining gas into said secondary tubular member for delivery by said lance to said molten metal bath.
A fluid cooled lance has an elongated tubular refractory body with a pair of tubular members arranged coaxially therein, one of said tubular members having longitudinally extending configurations which engage the inner surface of said refractory body, the other tubular member being disposed within the first mentioned tubular member engaging the inner surfaces of said longitudinally extending configurations thereof so as to form a plurality of separate longitudinally extending passageways, said tubular members forming means for introducing a coolant fluid into the lance and directing said coolant fluid therefrom, a secondary tubular member in said elongated tubular refractory body communicating with the opposite ends thereof and means for introducing stirring and refining gas into said secondary tubular member for delivery by said lance to said molten metal bath.
Description
~'~S~337~
AIR COOLED REFRACTORY LA~CE
Background of the Invention Technical Field:
This invention relates to fluid cooled lances such as usecl for introducing an inert gas into mo]ten metal for stirring the same or for injec-ting a stream of oxygen into molten metal for refining the same.
Description of the Prior Art:
Prior devices of this type may be seen in U.S. ~atents 3,115,405, 3,379,428, 3,521,872, 3,751,019 and 3,898,078.
In patent 3,115,405, a typical prior art lance formed of -tubular metal shapes is disclosed, the lance is intended for the introduction of oxygen into molten iron in making steel and is water cooled.
Pa-tent 3,379,428 discloses a metal lance formed of a plurality of concentric -tubular elements and useful in introducing oxygen into molten iron in a metallurgical furnace. The device is wa-ter cooled.
Patent 3,521,872 discloses a metal lance and utilizes an arrangement of introducing water in vapor form into the ~' i~..
~2S837~ `
gas conveyed by the lance into the molten metal.
Patent 3,751,019 discloses a fluid cooled lance formed of composite refractory and metal -for in-troducing oxygen or o-ther gases into or onto mol-ten metal baths.
The tubular metal portions are located wi-thin an enclosing refractory sleeve.
Patent 3,898,078 discloses a metal lance having a nozzle, a portion of which is covered wi-th a refractory material .
The present invention relates to a substantially improved air cooled refractory lance in which the principal body of the lance is formed of refractory material provided with a bore in which metal conduits are positioned and through which cooling air is in-troduced and removed in a manner creating a positive circulation -through the sub-stantially large hollow core of the refractory body.
An additional metal conduit positioned off center of the hollow core of the refrac-tory body forms a continuous passageway therethrough for the introduction of oxygen ~0 or other gases. The novel construction of the elongated ~l~S1~3~
re:Eractory body and its relatively large bore axially thereof throughout mos-t of its length enables air -to be effec-tively used to cool the refractory body and con-tribute -to i-ts substan-tially longer life than has heretofore been possible wi-th the prior art lances, many of which were water cooled as in the case of -the foregoing prior art patents.
ummary of the Invention An air cooled refractory lance for introducing inert gas for stirring or for injecting oxygen or another gas into molten metal or slag has an elongated re~ractory body with a relatively large bore axially thereof and formed with relatively thick wall sections around said bore. The bore terminates inwardly o~ one end and a plurality of metal conduits are positioned in the bore, one of which ~5 forms an extending member by which the lance may be supported and provides a passageway for air introduced into the lance for cooling the same, another conduit provides a return passage-way :Eor the air and still another conduit provides a passageway for introducing a Eluid through the lance and out of the -tip thereof.
~837~
Description of -the Drawings Figure 1 i.s a side elevatlon with parts broken away and parts in cross section illustrating the air cooled refractory lance;
Figure 2 is an enlarged cross sectional view of a portion of the lance seen in Figure 1 wi-th parts broken away and parts in. CI'OSS section;
Figure 3 is a horizontal section on line 3-3 of Figure 2; and Figure 4 is a horizontal. view on line 4-4 of Figure
AIR COOLED REFRACTORY LA~CE
Background of the Invention Technical Field:
This invention relates to fluid cooled lances such as usecl for introducing an inert gas into mo]ten metal for stirring the same or for injec-ting a stream of oxygen into molten metal for refining the same.
Description of the Prior Art:
Prior devices of this type may be seen in U.S. ~atents 3,115,405, 3,379,428, 3,521,872, 3,751,019 and 3,898,078.
In patent 3,115,405, a typical prior art lance formed of -tubular metal shapes is disclosed, the lance is intended for the introduction of oxygen into molten iron in making steel and is water cooled.
Pa-tent 3,379,428 discloses a metal lance formed of a plurality of concentric -tubular elements and useful in introducing oxygen into molten iron in a metallurgical furnace. The device is wa-ter cooled.
Patent 3,521,872 discloses a metal lance and utilizes an arrangement of introducing water in vapor form into the ~' i~..
~2S837~ `
gas conveyed by the lance into the molten metal.
Patent 3,751,019 discloses a fluid cooled lance formed of composite refractory and metal -for in-troducing oxygen or o-ther gases into or onto mol-ten metal baths.
The tubular metal portions are located wi-thin an enclosing refractory sleeve.
Patent 3,898,078 discloses a metal lance having a nozzle, a portion of which is covered wi-th a refractory material .
The present invention relates to a substantially improved air cooled refractory lance in which the principal body of the lance is formed of refractory material provided with a bore in which metal conduits are positioned and through which cooling air is in-troduced and removed in a manner creating a positive circulation -through the sub-stantially large hollow core of the refractory body.
An additional metal conduit positioned off center of the hollow core of the refrac-tory body forms a continuous passageway therethrough for the introduction of oxygen ~0 or other gases. The novel construction of the elongated ~l~S1~3~
re:Eractory body and its relatively large bore axially thereof throughout mos-t of its length enables air -to be effec-tively used to cool the refractory body and con-tribute -to i-ts substan-tially longer life than has heretofore been possible wi-th the prior art lances, many of which were water cooled as in the case of -the foregoing prior art patents.
ummary of the Invention An air cooled refractory lance for introducing inert gas for stirring or for injecting oxygen or another gas into molten metal or slag has an elongated re~ractory body with a relatively large bore axially thereof and formed with relatively thick wall sections around said bore. The bore terminates inwardly o~ one end and a plurality of metal conduits are positioned in the bore, one of which ~5 forms an extending member by which the lance may be supported and provides a passageway for air introduced into the lance for cooling the same, another conduit provides a return passage-way :Eor the air and still another conduit provides a passageway for introducing a Eluid through the lance and out of the -tip thereof.
~837~
Description of -the Drawings Figure 1 i.s a side elevatlon with parts broken away and parts in cross section illustrating the air cooled refractory lance;
Figure 2 is an enlarged cross sectional view of a portion of the lance seen in Figure 1 wi-th parts broken away and parts in. CI'OSS section;
Figure 3 is a horizontal section on line 3-3 of Figure 2; and Figure 4 is a horizontal. view on line 4-4 of Figure
2 showing the -tip end of the air cooled refractory lance.
Description of -the Preferred Embodiment In the form of the invention illustrated and described herein, the air cooled refrac-tory lance comprises an elongated relati.vely thick walled cross sectionally circular tubular refractory body 10, the tip end 11 of the refractory body 10 is solid and the remainder of the refractory body 10 has a cross sectionally triangular shaped bore 12 extending axially thereof. ~ cross sectionally triangular metal tube 13 is positioned in the bore 12 and a cross sectionally circular .~2~337~l tube 14 is positioned in -the cross sectionally triangular metal tube 13 and secured -thereto as by spot welds, the combination of the metal tubes 13 and 14 forming three distinct passageways 15, 16 and 17 as best seen in Figure 3 of the drawings, all of which communicate with one ano-ther adjacen-t the lower end of the tube 14 which is spaced with respect to the lower end of the cross sectionally triangular metal tube 13 which is provided with an end closure 18 as bes-t seen in Figure 2 of the drawings.
The upper end of the cross sectionally triangular metal -tube 13 extends above the upper end of the thick walled cross sectionally circular refractory body 10 and the cross sectionally circular tube 14 extçnds upwardly and outwardly with respect thereto and forms a convenient handling member. A baffle 19 is attached to the tube 14 in spaced relation to the upper end of the cross sectionally triangular metal tube 13 and a fastener assembly 20 is positioned inwardly of the upper outer end of the tube 14 and includes a bail 21, the upper end of the tube 14 is provided with a reducing fitting 22 to which a compressed .~S83~
air hose may be convenien-tly at-tached so that compressed air for cooling may be directed downward]y through the tube 1~. The cooling air will emerge ~rom the bottom of the tube 14 as shown by the arrow in Figure 2 of the draw-ings and flow upwardly through the three passageways 15, 16 and 17, each of which is defined by two of the three engaging portions o-f the cross sectionally triangular metal tube 13 as best seen in Figure 3 oi -the drawings.
The arrangement is such that the interior of the elongated tubular refractory body 10 with its relatively thick walls is uni~ormly cooled by the cooling air flowing upwardly therethrough and the life of the refractory body 10 thus considerably increased. The cooling air e~its from the upper end of the cross sectionally triangular metal tube 13 as shown by the arrows in Figure 2 of the drawings.
By reIerring now -to Figures 1 and 2 of the drawings, it wil:l be seen that a secondary tube 23 provided with an elbow 2~ on its upper end is positioned alongside -the cross sectionally -triangular metal -tube 13 and ex-tends longitudinally ~5~337~
of and completely -through the elongated -tubular refractory body 10 and forms an outlet port 25 in the bottom of the tip end 11 of -the refractory body 10. Alternately, -the ou-tlet por-t 25 may be positioned in the side of the tip end 11 of the refractory body 10 and by forming a T-shaped passageway on -the lower end of -the secondary rube 23, multiple outlet ports may be provided.
A still further variation is possible by adding a porous member to the tip end 11 of the refractory body 10 and utilizing the porous member as a multiple orificed outle-t for stirring gas or the like directed downwardly through the secondary tube 23. The tube 14 may be of several alternate cross sectional shapes, such as square, triangular, etc. The above-described air cooled refractory lance forms an efficient relatively simple device for introducing a stirring gas into a molten metal bath or alternately directing an oxygen stream against or into a molten metal bath such as molten iron in refining the same in a steel making process. The elongated -tubular refractory body member 10 preferably has a wall thickness at least equal to the largest cross sectional area of the bore 12 ~i8~
therein.
The device o~ the invention is simply and easily formed and is possessed of an unusually long life as compared wi-th the prior art lances due to the novel and highly efficient air cooling passageways formed in the lance by the novel tubular members incorporated therein.
Having thus described my invention, wha~ I claim is:
Description of -the Preferred Embodiment In the form of the invention illustrated and described herein, the air cooled refrac-tory lance comprises an elongated relati.vely thick walled cross sectionally circular tubular refractory body 10, the tip end 11 of the refractory body 10 is solid and the remainder of the refractory body 10 has a cross sectionally triangular shaped bore 12 extending axially thereof. ~ cross sectionally triangular metal tube 13 is positioned in the bore 12 and a cross sectionally circular .~2~337~l tube 14 is positioned in -the cross sectionally triangular metal tube 13 and secured -thereto as by spot welds, the combination of the metal tubes 13 and 14 forming three distinct passageways 15, 16 and 17 as best seen in Figure 3 of the drawings, all of which communicate with one ano-ther adjacen-t the lower end of the tube 14 which is spaced with respect to the lower end of the cross sectionally triangular metal tube 13 which is provided with an end closure 18 as bes-t seen in Figure 2 of the drawings.
The upper end of the cross sectionally triangular metal -tube 13 extends above the upper end of the thick walled cross sectionally circular refractory body 10 and the cross sectionally circular tube 14 extçnds upwardly and outwardly with respect thereto and forms a convenient handling member. A baffle 19 is attached to the tube 14 in spaced relation to the upper end of the cross sectionally triangular metal tube 13 and a fastener assembly 20 is positioned inwardly of the upper outer end of the tube 14 and includes a bail 21, the upper end of the tube 14 is provided with a reducing fitting 22 to which a compressed .~S83~
air hose may be convenien-tly at-tached so that compressed air for cooling may be directed downward]y through the tube 1~. The cooling air will emerge ~rom the bottom of the tube 14 as shown by the arrow in Figure 2 of the draw-ings and flow upwardly through the three passageways 15, 16 and 17, each of which is defined by two of the three engaging portions o-f the cross sectionally triangular metal tube 13 as best seen in Figure 3 oi -the drawings.
The arrangement is such that the interior of the elongated tubular refractory body 10 with its relatively thick walls is uni~ormly cooled by the cooling air flowing upwardly therethrough and the life of the refractory body 10 thus considerably increased. The cooling air e~its from the upper end of the cross sectionally triangular metal tube 13 as shown by the arrows in Figure 2 of the drawings.
By reIerring now -to Figures 1 and 2 of the drawings, it wil:l be seen that a secondary tube 23 provided with an elbow 2~ on its upper end is positioned alongside -the cross sectionally -triangular metal -tube 13 and ex-tends longitudinally ~5~337~
of and completely -through the elongated -tubular refractory body 10 and forms an outlet port 25 in the bottom of the tip end 11 of -the refractory body 10. Alternately, -the ou-tlet por-t 25 may be positioned in the side of the tip end 11 of the refractory body 10 and by forming a T-shaped passageway on -the lower end of -the secondary rube 23, multiple outlet ports may be provided.
A still further variation is possible by adding a porous member to the tip end 11 of the refractory body 10 and utilizing the porous member as a multiple orificed outle-t for stirring gas or the like directed downwardly through the secondary tube 23. The tube 14 may be of several alternate cross sectional shapes, such as square, triangular, etc. The above-described air cooled refractory lance forms an efficient relatively simple device for introducing a stirring gas into a molten metal bath or alternately directing an oxygen stream against or into a molten metal bath such as molten iron in refining the same in a steel making process. The elongated -tubular refractory body member 10 preferably has a wall thickness at least equal to the largest cross sectional area of the bore 12 ~i8~
therein.
The device o~ the invention is simply and easily formed and is possessed of an unusually long life as compared wi-th the prior art lances due to the novel and highly efficient air cooling passageways formed in the lance by the novel tubular members incorporated therein.
Having thus described my invention, wha~ I claim is:
Claims (10)
1. A fluid cooled lance for use in treating a bath of molten metal comprising an elongated tubular refractory body, a pair of tubular metal members arranged coaxially in said elongated refractory body, one of said tubular metal members having a plurality of trans-versely flat wall sections engaging the inner surface of said elongated tubular refractory body, the other of said tubular metal members disposed within said first mentioned tubular metal member shaped to form a plurality of separate longitudinally extending passageways, said tubular metal members extending outwardly of one end of said elongated tubular refractory body and forming means for introducing a coolant fluid into said lance and directing said coolant fluid therefrom, a secondary tubular member in said elongated tubular refractory body communicating with the opposite ends thereof and means for introducing stirring and refining gas into said secondary tubular member for delivery by said lance to said molten metal bath and means in communication with one of said pair of tubular metal members for introducing a coolant fluid thereinto, one of said pair of tubular metal members extending outwardly of said elongated tubular refractory body to a greater extent than the other so as to form a handling and supporting means.
2. The fluid cooled lance for use in treating a bath of molten metal as set forth in claim 1 and wherein said one of said tubular metal members having a plurality of transversely flat wall sections is triangular in cross section.
3. The fluid cooled lance for use in treating a bath of molten metal set forth in claim 1 and wherein the other of said tubular metal members disposed within said first mentioned tubular member is cross sectionally circular and ends inwardly of the adjacent end of said tubular metal member having a plurality of transversely flat wall sections.
4. The fluid cooled lance for use in treating a bath of molten metal set forth in claim 1 and wherein said other of said tubular metal members disposed within said first mentioned tubular member is cross sectionally circular.
5. The fluid cooled lance for use in treating a bath of molten metal set forth in claim 1 and wherein said one of said pair of tubular metal members extending outwardly of said elongated tubular refractory body to a greater extent than the other is disposed within said first mentioned tubular member and has means on the outermost end thereof for introducing coolant fluid thereinto.
6. The fluid cooled lance for use in treating a bath of molten metal as set forth in claim 1 wherein said elongated tubular refrac-tory body is cross sectionally circular on its exterior and cross sectionally non-circular on its interior and has a total wall thick-ness at least equal to the largest cross sectional open area therein.
7. The fluid cooled lance for use in treating a bath of molten metal set forth in claim 1 and wherein a solid refractory tip por-tion is formed on one end of said elongated tubular refractory body and wherein said secondary tubular member extends therethrough.
8. The fluid cooled lance for use in treating a bath of molten metal set forth in claim 1 and wherein a porous refractory tip is formed on one end of said elongated tubular refractory body and wherein said secondary tubular member communicates with said porous tip.
9. The fluid cooled lance of claim 1 and wherein the other of said tubular metal members is cross sectionally shaped in several transversely flat wall sections.
10. A fluid cooled lance for use in treating a bath of molten metal comprising an elongated tubular refractory body, a pair of tubular members arranged coaxially in said elongated refractory body, one of said tubular members having a plurality of longitudinally extending configurations in its wall sections which engage the inner surface of said elongated tubular refractory body, the other of said tubular members disposed within said first mentioned tubular member and shaped to engage the inner surfaces of said longitudinally extending configurations thereof so as to form a plurality of separate longitudinally extending passageways, said tubular members extending outwardly of one end of said elongated tubular refractory body and forming means for introducing coolant fluid into said lance and directing said coolant fluid therefrom, a secondary tubular member in said elongated tubular refractory body communicating with the opposite ends thereof and means for introducing stirring and refin-ing gas into said secondary tubular member for delivery by said lance to said molten metal bath and means in communication with one of said pair of tubular members for introducing a coolant fluid thereinto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000490034A CA1258371A (en) | 1985-09-05 | 1985-09-05 | Air cooled refractory lance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000490034A CA1258371A (en) | 1985-09-05 | 1985-09-05 | Air cooled refractory lance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1258371A true CA1258371A (en) | 1989-08-15 |
Family
ID=4131312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000490034A Expired CA1258371A (en) | 1985-09-05 | 1985-09-05 | Air cooled refractory lance |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1258371A (en) |
-
1985
- 1985-09-05 CA CA000490034A patent/CA1258371A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |