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US 5,266,025 AGranted
Composite lance
AssigneePraxair Technology, Inc.
InventorsArthur W. Francis, Jr., Hisashi Kobayashi, Geoffrey B. Tuson
Life of this patent
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Abstract
A lance and gas injection system wherein the lance comprises a metallic supply tube and a two piece small diameter nozzle comprising a metallic backpiece and a ceramic frontpiece.
Claims12
A composite lance comprising:
- (A) a supply tube comprised of metal;
- (B) a nozzle having a backpiece and a frontpiece, and backpiece comprised of metal different from that comprising the supply tube, said backpiece communicating with the supply tube, said frontpiece comprised of ceramic and adjoining said backpiece, wherein the metallic backpiece comprises from 10 to 60 percent and ceramic frontpiece comprises from 40 to 90 percent of the axial length of the nozzle measured on the inner side of the nozzle;
- (C) at least one aperture through which gas may be ejected from the ceramic frontpiece of the nozzle;
- and
- (D) means for providing protective gas around the nozzle.
2 more elements
A composite lance gas injection system comprising a cavity within a wall of a combustion zone and having an opening communicating with the combustion zone, and a composite lance within the cavity said composite lance comprising:
- (A) a supply tube comprised of metal and communicating with a source of gas;
- (B) a nozzle recessed from the opening, said nozzle having a backpiece and a frontpiece, said backpiece comprised of metal and communicating with the supply tube, said frontpiece comprised of ceramic and adjoining said backpiece wherein the metallic backpiece comprises from 10 to 60 percent and the ceramic frontpiece comprises from 40 to 90 percent of the axial length of the nozzle measured on the inner side of the nozzle;
- (C) at least one aperture through which gas may be ejected from the ceramic frontpiece of the nozzle;
- and
- (D) means for providing protective gas around the nozzle.
2 more elements
Dependencies are inferred from the claim text.