US3889933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical lance
Assignee: Vale Canada Ltd
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Filing: 1974-02-28
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Granted: 1975-06-17
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Expires: 1994-02-28
Abstract
Abstract A lancing system for introducing heat and process oxygen into a pyrometallurgical furnace comprising a lance of nested pipes, a lance tip of special design on one end of the lance, means to introduce high pressure process oxygen, low pressure combustion oxygen, air and natural gas to the other end of the lance and gas control means to provide at least 10% of the oxygen needed for combustion as pure oxygen.
Inventors
- 👤 Louis Harold Jaquay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:34
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/143
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
14 words
A LANCE CONSISTING OF AT LEAST FOUR NESTING PIPES SPACED APART FROM ONE ANOTHER,
Claim 2
Dependent Claim
14 words
A LANCE CONSISTING OF AT LEAST FOUR NESTING PIPES SPACED APART FROM ONE ANOTHER,
Claim 3
Independent Claim
13 words
A SYSTEM FOR SUPPLYING HEAT AND PROCESS OXYGEN TO A METALLURICAL OPERATION COMPRISING:
Claim 4
Independent Claim
13 words
A SYSTEM FOR SUPPLYING HEAT AND PROCESS OXYGEN TO A METALLURICAL OPERATION COMPRISING:
Claim 5
Dependent Claim
62 words
MEANS CONNECTEDD TO ONE END OF THE LANCE A. TO SUPPLY HIGH PRESSURE OXYGEN TO THE CENTERMOST PIPE, B. TO SUPPLY LOW PRESSURE OXYGEN AND AIR TO AT LEAST ONE CONDUIT BETWEEN THE NESTING PIPES, C. TO SUPPLY NATURAL GAS TO ONE OTHER CONDUIT BETWEEN THE NESTING PIPES, D. TO SUPPLY AND CIRCULATE WATER WITHIN THE OUTERMOST CONDUIT BETWEEN SAID NESTING PIPES;
Claim 6
Dependent Claim
62 words
MEANS CONNECTEDD TO ONE END OF THE LANCE A. TO SUPPLY HIGH PRESSURE OXYGEN TO THE CENTERMOST PIPE, B. TO SUPPLY LOW PRESSURE OXYGEN AND AIR TO AT LEAST ONE CONDUIT BETWEEN THE NESTING PIPES, C. TO SUPPLY NATURAL GAS TO ONE OTHER CONDUIT BETWEEN THE NESTING PIPES, D. TO SUPPLY AND CIRCULATE WATER WITHIN THE OUTERMOST CONDUIT BETWEEN SAID NESTING PIPES;
Claim 7
Dependent Claim
68 words
means connected to one end of the lance a. to supply high pressure oxygen to the centermost pipe, b. to supply combustion oxidizer in the forms of low pressure oxygen and air to at least one conduit between the nesting pipes, c. to supply natural gas to one other conduit between the nesting pipes, d. to supply and circulate water within the outermost conduit between said nesting pipes;
Claim 8
Dependent Claim
68 words
means connected to one end of the lance a. to supply high pressure oxygen to the centermost pipe, b. to supply combustion oxidizer in the forms of low pressure oxygen and air to at least one conduit between the nesting pipes, c. to supply natural gas to one other conduit between the nesting pipes, d. to supply and circulate water within the outermost conduit between said nesting pipes;
Claim 9
Dependent Claim
24 words
A system as in claim 1 wherein the end wall of the lance tip has the shape of the surface of a truncated cone.
Claim 10
Dependent Claim
62 words
means connected to one end of the lance a. to supply high pressure oxygen to the centermost pipe, b. to supply low pressure oxygen and air to at least one conduit between the nesting pipes, c. to supply natural gas to one other conduit between the nesting pipes, d. to supply and circulate water within the outermost conduit between said nesting pipes;
Claim 11
Dependent Claim
62 words
means connected to one end of the lance a. to supply high pressure oxygen to the centermost pipe, b. to supply low pressure oxygen and air to at least one conduit between the nesting pipes, c. to supply natural gas to one other conduit between the nesting pipes, d. to supply and circulate water within the outermost conduit between said nesting pipes;
Claim 12
Dependent Claim
84 words
a tip affixed to the other end of said lance and enclosing said conduit carrying water, comprising a concave end wall having at the point of greatest concavity a port comprising a nozzle for said high pressure oxygen and having arcuate sets of ports therein communicating with the conduits carrying low pressure oxygen, natural gas and air each set of ports being spaced apart from the next set of ports by a distance of about 0.75 to 1.5 inch in the axial direction and
Claim 13
Dependent Claim
84 words
a tip affixed to the other end of said lance and enclosing said conduit carrying water, comprising a concave end wall having at the point of greatest concavity a port comprising a nozzle for said high pressure oxygen and having arcuate sets of ports therein communicating with the conduits carrying low pressure oxygen, natural gas and air each set of ports being spaced apart from the next set of ports by a distance of about 0.75 to 1.5 inch in the axial direction and
Claim 14
Dependent Claim
84 words
a tip affixed to the other end of said lance and enclosing said conduit carrying water, comprising a concave end wall having at the point of greatest concavity a port comprising a nozzle for said high pressure oxygen and having arcuate sets of ports therein communicating with the conduits carrying low pressure oxygen, natural gas and air each set of ports being spaced apart from the next set of ports by a distance of about 0.75 to 1.5 inch in the axial direction and
Claim 15
Dependent Claim
84 words
a tip affixed to the other end of said lance and enclosing said conduit carrying water, comprising a concave end wall having at the point of greatest concavity a port comprising a nozzle for said high pressure oxygen and having arcuate sets of ports therein communicating with the conduits carrying low pressure oxygen, natural gas and air each set of ports being spaced apart from the next set of ports by a distance of about 0.75 to 1.5 inch in the axial direction and
Claim 16
Dependent Claim
27 words
A system as in claim 1 wherein the lance comprises five concentrically nesting pipes adapted to convey natural gas, low pressure oxygen and air in separate conduits.
Claim 17
Dependent Claim
20 words
A TIP AFFIXED TO THE OTHER END OF SAID LANCE AND ENCLOSING SAID CONDUIT CARRYING WATER, COMPRISING A CONCAVE END
Claim 18
Dependent Claim
20 words
A TIP AFFIXED TO THE OTHER END OF SAID LANCE AND ENCLOSING SAID CONDUIT CARRYING WATER, COMPRISING A CONCAVE END
Claim 19
Dependent Claim
78 words
means to regulate the flow of said low pressure oxygen, natural gas and low pressure air to provide at least 10% of the oxygen needed for combustion of said natural gas in the form of low pressure oxygen, under conditions whereby the combustion oxidizer and natural gas flow turbulently from the supply means through the lance, thoroughly mix in the space immediately external to the lance tip and maintain a stable flame structure forward of the lance tip.
Claim 20
Dependent Claim
78 words
means to regulate the flow of said low pressure oxygen, natural gas and low pressure air to provide at least 10% of the oxygen needed for combustion of said natural gas in the form of low pressure oxygen, under conditions whereby the combustion oxidizer and natural gas flow turbulently from the supply means through the lance, thoroughly mix in the space immediately external to the lance tip and maintain a stable flame structure forward of the lance tip.
Claim 21
Dependent Claim
38 words
MEANS TO REGULATE THE FLOW OF SAID LOW PRESSURE OXYGEN, NATURAL GAS AND LOW PRESSURE AIR TO PROVIDE AT LEAST 10% OF THE OXYGEN NEEDED FOR COMBUSTION OF SAID NATURAL GAS IN THE FORM OF LOW PRESSURE OXYGEN.
Claim 22
Dependent Claim
38 words
MEANS TO REGULATE THE FLOW OF SAID LOW PRESSURE OXYGEN, NATURAL GAS AND LOW PRESSURE AIR TO PROVIDE AT LEAST 10% OF THE OXYGEN NEEDED FOR COMBUSTION OF SAID NATURAL GAS IN THE FORM OF LOW PRESSURE OXYGEN.
Claim 23
Dependent Claim
25 words
In a process for operating a top blown rotary converter the improvement comprising introducing heat and process oxygen by means of a lancing system comprising:
Claim 24
Dependent Claim
25 words
In a process for operating a top blown rotary converter the improvement comprising introducing heat and process oxygen by means of a lancing system comprising:
Claim 25
Dependent Claim
38 words
means to regulate the flow of said low pressure oxygen, natural gas and low pressure air to provide at least 10% of the oxygen needed for combustion of said natural gas in the form of low pressure oxygen.
Claim 26
Dependent Claim
38 words
means to regulate the flow of said low pressure oxygen, natural gas and low pressure air to provide at least 10% of the oxygen needed for combustion of said natural gas in the form of low pressure oxygen.
Claim 27
Dependent Claim
33 words
A process as in claim 4 wherein turbulently flowing low pressure air and oxygen flow in separate conduits in the lance which separate conduits radially abut the conduit carrying turbulently flowing natural gas.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |