GB1600368A - Metallurgical immersion blowing lances - Google Patents

Metallurgical immersion blowing lances Download PDF

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Publication number
GB1600368A
GB1600368A GB35449/77A GB3544977A GB1600368A GB 1600368 A GB1600368 A GB 1600368A GB 35449/77 A GB35449/77 A GB 35449/77A GB 3544977 A GB3544977 A GB 3544977A GB 1600368 A GB1600368 A GB 1600368A
Authority
GB
United Kingdom
Prior art keywords
annular gap
tube
lance
inlet
sectors
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
Application number
GB35449/77A
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.)
Gr Stein Refractories Ltd
Original Assignee
Gr Stein Refractories Ltd
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 Gr Stein Refractories Ltd filed Critical Gr Stein Refractories Ltd
Priority to GB35449/77A priority Critical patent/GB1600368A/en
Priority to DE19782834829 priority patent/DE2834829A1/en
Priority to SE7808894A priority patent/SE7808894L/en
Publication of GB1600368A publication Critical patent/GB1600368A/en
Expired legal-status Critical Current

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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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO METALLURGICAL IMMERSION BLOWING LANCES (71) We, GR-STEIN REFRACTOR IES LIMITED, a British Company of Genefax House, Tapton Park Road, Sheffield, S10 3FJ. do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to metallurgical immersion blowing lances and is particularly concerned with lances for the injection of fluids, e.g. a gas stream including particulate materials or powders, into a molten bath.
Such lances are usually a two part construction, with a steel tube encased in a refractory material, with steel tube supplying a major part of the strength of the lance, leaving the encasing refractory to protect the steel tube from the thermal and corrosive nature of the environment. Inevitably, during use, the lance is subject to thermal expansion, and because of the thermal expansion differences between the steel and the refractory, cracking and even destruction of the encasing refractory can occur. Lances have been developed which considerably enhance the cooling effect of carrier gases passed at high velocity along the tube, the cooling effect being sufficient to cool the steelwork and prevent major stresses being set up in the refractory during operation.However, on the removal of the lance from the melt, the flow of carrier gas is stopped and the lance equalises in temperature. This causes the steel tube to heat up and expand, causes stress. and possibly cracks and even destruction of the encasing refractory, According to the present invention, a metallurgical immersion blowing lance comprises inner and outer concentric metal tubes, and an encasing refractory coating on the outer tube, inlet means to the annular gap between the tubes for cooling gas and outlet means from the annular gap for the exhaust of cooling gas.
Thus, when the lance is withdrawn from the melt, cooling gas is continued to be supplied with the effect that the steelwork is still cooled by the cooling gas, thereby preventing any temperature rise in the outer tube particularly, thereby reducing any tendency for stressing, cracking or destruction of the encasing refractory.
With plug means closing the upper and lower ends of the annular gap, a gas inlet may be provided to the annular gap at its outer (in use) end, and hollow fins secured to the outside of the outer tube communicating with the annular gap at its inner (in use) end through appropriate holes in the outer tube. Thus with the fins closed at the inner end of the lance and open at the outer end of the lance, cooling gas admitted through the inlet port passes along the annular gap, through the holes, and along the hollow fins to atmosphere.
Alternatively, the annular gap may be divided longitudinally by diametrically disposed dividing plates extending between the tubes, the dividing plates extending from the plug at the outer end of the lance and stopping short of the plug at the inner end.
Thus with inlet and outlet ports to the annular gap through the outer tube being at the same (outer) end of the lance, cooling gas is admitted to one half of the annular gap, passes along that half, around the bottom of the dividing plates and along the other half of the annular gap to the outlet port. Yet again, four equally spaced dividing plates can be provided, with two inlet and two outlet ports through the outer tube at the outer end of the lance.
Instead of radial dividing plates, parallel dividing plates can be provided bridging the bore of the outer tube and in contact with the inner tube. Again the dividing plates stop short of the inner end to provide two inlet sectors and two outlet sectors of the annular gap, with again two inlet and outlet ports provided through the outer tube at the outer end of the lance.
Yet again, the annular gap may be divided into two annular gaps by a further concentric tube stopping short of the inner end of the lance. Thus, with an inlet port extending through the outer tube and the further concentric tube, and an outlet port extending through the outer tube, both at the outer end of the lance, with cooling gas admitted to the inside of the further concentric tube. passes along that annular gap, round the bottom of the further concentric tube and up between the further concentric tube and the outer tube to the outlet port.
Several embodiments of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a sectional side elevation of a cooling lance in accordance with the inven tion Figure 2 is a section on the line 2-2 of Figure 1; Figures 3, 5, 7 and 9 correspond to Figure 1 but show alternative embodiments of cooling lance; and Figures 4, 6, 8 and 10 correspond to Figure 2 but are respective sections on the lines 4-4, 6-6, 8-8 and 10-10 of Figures 3, 5,7 and 9.
In all the drawings, the refractory coating applied to the outer steel tubes has been omitted for clarity. and like parts are given the same reference numeral.
In Figures 1 and 2, a lance has an outer steel tube 1 and an inner steel tube 2 secured together in concentric relationship by top and bottom plugs 3 and 4 of heat resistant material, to provide an annulus 5. A cooling gas inlet 6 is provided through the wall of the outer tube towards its outer end, and a series of holes 7 are formed through the wall of the outer tube towards its inner end, the holes 7 co-operating with corresponding holes in cooling gas exhaust ducts 8 secured externally of the outer steel tube 1. The fin-like exhaust ducts 8 are closed at their inner ends and open at their outer ends.
Thus, cooling gas admitted to the annulus 5 flows through the holes 7 and to atmosphere along the exhaust ducts.
In Figures 3 and 4, the annular gap 5 between the inner and outer tubes is divided by diametrically disposed dividing plates 9 which stop short of the plug 4. In addition to the gas inlet 6, a gas outlet 10 is provided through the outer tube towards its outer end at the opposite side of the dividing plates.
Thus, gas admitted through the inlet 6 passes down one half of the annular gap around the bottom of the dividing plates. up the other half of the annular gap and out through the exhaust port 10.
In Figures 5 and 6, the annular gap 5 is divided longitudinally by two parallel plates 11 bridging the bore of the outer tube and touching the inner tube, both plates stopping short of the plug 4, to provide two inlet sectors 12 and two outlet sectors 13 of the annular gap. Two inlet ports 6 are provided one to each sector 11, and two outlet ports 10 one from each sector 13. Thus, gas admitted through the inlet ports 6 passes down the sectors 12 around the bottoms of the plates 11 and up the sectors 13 to the outlet ports 10.
In Figures 7 and 8, the annular gap 5 is divided into two inlet sectors by radial plates 14 diametrically disposed, the radial plates stopping short of the plug 4. Here again, gas admitted to the sectors 12 through the inlets 6 passes down the sectors round the bottoms of the plates and up the sectors 13 to the outlet 10.
In Figures 9 and 10, a further concentric tube 15 lying mid-way between the outer tube 1 and the inner tube 2, and is secured in place by the plug 3. The concentric tube 15 stops short of the plug 4. Thus two annular gaps 5A and 5B are provided, the annular gap 5B communicating with the inlet port 6 and the annular gap 5A communicating with the outlet port 10, incoming gas passing through the inlet port 6, down the annular gap 5B, round the bottom of the tube 15, up the annular gap 5A and out through the outlet port 10.
WHAT WE CLAIM IS: 1. A metallurgical immersion blowing lance comprising inner and outer concentric metal tubes, and an encasing refractory coating on the outer tube, inlet means to the annular gap between the tubes for cooling gas and outlet means from the annular gap for the exhaust of cooling gas.
2. A lance as in Claim 1, wherein plug means close the upper and lower ends of the annular gap, the plug means serving to locate the outer tube with respect to the inner tube.
3. A lance as in Claim 1 or Claim 2.
wherein a gas inlet is provided to the annular gap at its outer (in use) end. and hollow fins secured to the outside of the outer tube communicate with the annular gap at its inner (in use) end through appropriate holes in the outer tube.
4. A lance as in Claim 1 or Claim 2, wherein the annular gap is divided longitudinally by diametrically disposed dividing plates extending between the tubes, the dividing plates extending from the plug at the outer end of the lance and stopping short of the plug at the inner end with inlet and outlet ports to the annular gap through the outer tube being at the same (outer) end of the lance, and to opposite sides of the plates.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. inlet sectors and two outlet sectors of the annular gap, with again two inlet and outlet ports provided through the outer tube at the outer end of the lance. Yet again, the annular gap may be divided into two annular gaps by a further concentric tube stopping short of the inner end of the lance. Thus, with an inlet port extending through the outer tube and the further concentric tube, and an outlet port extending through the outer tube, both at the outer end of the lance, with cooling gas admitted to the inside of the further concentric tube. passes along that annular gap, round the bottom of the further concentric tube and up between the further concentric tube and the outer tube to the outlet port. Several embodiments of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a sectional side elevation of a cooling lance in accordance with the inven tion Figure 2 is a section on the line 2-2 of Figure 1; Figures 3, 5, 7 and 9 correspond to Figure 1 but show alternative embodiments of cooling lance; and Figures 4, 6, 8 and 10 correspond to Figure 2 but are respective sections on the lines 4-4, 6-6, 8-8 and 10-10 of Figures 3, 5,7 and 9. In all the drawings, the refractory coating applied to the outer steel tubes has been omitted for clarity. and like parts are given the same reference numeral. In Figures 1 and 2, a lance has an outer steel tube 1 and an inner steel tube 2 secured together in concentric relationship by top and bottom plugs 3 and 4 of heat resistant material, to provide an annulus 5. A cooling gas inlet 6 is provided through the wall of the outer tube towards its outer end, and a series of holes 7 are formed through the wall of the outer tube towards its inner end, the holes 7 co-operating with corresponding holes in cooling gas exhaust ducts 8 secured externally of the outer steel tube 1. The fin-like exhaust ducts 8 are closed at their inner ends and open at their outer ends. Thus, cooling gas admitted to the annulus 5 flows through the holes 7 and to atmosphere along the exhaust ducts. In Figures 3 and 4, the annular gap 5 between the inner and outer tubes is divided by diametrically disposed dividing plates 9 which stop short of the plug 4. In addition to the gas inlet 6, a gas outlet 10 is provided through the outer tube towards its outer end at the opposite side of the dividing plates. Thus, gas admitted through the inlet 6 passes down one half of the annular gap around the bottom of the dividing plates. up the other half of the annular gap and out through the exhaust port 10. In Figures 5 and 6, the annular gap 5 is divided longitudinally by two parallel plates 11 bridging the bore of the outer tube and touching the inner tube, both plates stopping short of the plug 4, to provide two inlet sectors 12 and two outlet sectors 13 of the annular gap. Two inlet ports 6 are provided one to each sector 11, and two outlet ports 10 one from each sector 13. Thus, gas admitted through the inlet ports 6 passes down the sectors 12 around the bottoms of the plates 11 and up the sectors 13 to the outlet ports 10. In Figures 7 and 8, the annular gap 5 is divided into two inlet sectors by radial plates 14 diametrically disposed, the radial plates stopping short of the plug 4. Here again, gas admitted to the sectors 12 through the inlets 6 passes down the sectors round the bottoms of the plates and up the sectors 13 to the outlet 10. In Figures 9 and 10, a further concentric tube 15 lying mid-way between the outer tube 1 and the inner tube 2, and is secured in place by the plug 3. The concentric tube 15 stops short of the plug 4. Thus two annular gaps 5A and 5B are provided, the annular gap 5B communicating with the inlet port 6 and the annular gap 5A communicating with the outlet port 10, incoming gas passing through the inlet port 6, down the annular gap 5B, round the bottom of the tube 15, up the annular gap 5A and out through the outlet port 10. WHAT WE CLAIM IS:
1. A metallurgical immersion blowing lance comprising inner and outer concentric metal tubes, and an encasing refractory coating on the outer tube, inlet means to the annular gap between the tubes for cooling gas and outlet means from the annular gap for the exhaust of cooling gas.
2. A lance as in Claim 1, wherein plug means close the upper and lower ends of the annular gap, the plug means serving to locate the outer tube with respect to the inner tube.
3. A lance as in Claim 1 or Claim 2.
wherein a gas inlet is provided to the annular gap at its outer (in use) end. and hollow fins secured to the outside of the outer tube communicate with the annular gap at its inner (in use) end through appropriate holes in the outer tube.
4. A lance as in Claim 1 or Claim 2, wherein the annular gap is divided longitudinally by diametrically disposed dividing plates extending between the tubes, the dividing plates extending from the plug at the outer end of the lance and stopping short of the plug at the inner end with inlet and outlet ports to the annular gap through the outer tube being at the same (outer) end of the lance, and to opposite sides of the plates.
5. A lance as in Claim 1 or Claim 2,
wherein the annular gap is divided longitudinally by four diametrically disposed dividing plates extending between the tubes, the dividing plates extending from the plug at the outer end of the lance and stopping short of the plug at the inner end with two inlet ports and two outlet ports through the outer tube towards the outer end communicating with two inlet annular gap sectors and two outlet annular gap sectors respectively.
6. A lance as in Claim 1 or Claim 2, wherein two parallel dividing plates are provided bridging the bore of the outer tube and in contact with the inner tube, the dividing plates stopping short of the inner end to provide two inlet sectors and two outlet sectors of the annular gap, with two inlet and outlet ports provided through the outer tube at the outer end of the plane.
7. A lance as in Claim 1 or Claim 2, wherein the annular gap is divided into two annular gaps by a further concentric tube stopping short of the inner end of the lance with an inlet port extending through the outer tube and the further concentric tube, and an outlet port extending through the outer tube. both at the outer end of the lance.
8. A lance substantially as hereinbefore described with reference to Figures 1 and 2, Figures 3 and 4. Figures 5 and 6, Figures 7 and 8, and Figures 9 and 10 of the accompanying drawings.
GB35449/77A 1977-08-24 1977-08-24 Metallurgical immersion blowing lances Expired GB1600368A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB35449/77A GB1600368A (en) 1977-08-24 1977-08-24 Metallurgical immersion blowing lances
DE19782834829 DE2834829A1 (en) 1977-08-24 1978-08-09 INJECTOR LANCE
SE7808894A SE7808894L (en) 1977-08-24 1978-08-23 LANS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35449/77A GB1600368A (en) 1977-08-24 1977-08-24 Metallurgical immersion blowing lances

Publications (1)

Publication Number Publication Date
GB1600368A true GB1600368A (en) 1981-10-14

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ID=10377869

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GB35449/77A Expired GB1600368A (en) 1977-08-24 1977-08-24 Metallurgical immersion blowing lances

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DE (1) DE2834829A1 (en)
GB (1) GB1600368A (en)
SE (1) SE7808894L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123129A (en) * 1982-07-06 1984-01-25 British Steel Corp Improvements in and relating to lances for introducing a flowable medium into a bath of molten metal.
GB2162932A (en) * 1984-07-11 1986-02-12 Tolltreck Systems Limited Cooling metallurgical apparatus
GB2172384A (en) * 1985-03-29 1986-09-17 Vasipari Kutato Fejleszto Metallurgical blowing lances

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR8008777A (en) * 1979-03-16 1981-05-26 Hoeganaes Ab REFRACTORY COATING FOR A METAL PIPE
US4779847A (en) * 1988-02-02 1988-10-25 Rodway Jack L Metallurgical injection lance
US4913735A (en) * 1989-02-09 1990-04-03 Palmer Manufacturing & Supply, Inc. Flux injector lance for use in processing aluminum and method
EP0919634A1 (en) * 1997-12-01 1999-06-02 Plibrico G.m.b.H. Blow lance with gas cooled refractory casing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE849582R (en) * 1976-01-07 1977-04-15 Rene Desaar POCKET CAST IRON DESULFURATION LANCE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123129A (en) * 1982-07-06 1984-01-25 British Steel Corp Improvements in and relating to lances for introducing a flowable medium into a bath of molten metal.
GB2162932A (en) * 1984-07-11 1986-02-12 Tolltreck Systems Limited Cooling metallurgical apparatus
GB2172384A (en) * 1985-03-29 1986-09-17 Vasipari Kutato Fejleszto Metallurgical blowing lances

Also Published As

Publication number Publication date
SE7808894L (en) 1979-02-25
DE2834829A1 (en) 1979-03-08

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee