US3758090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion apparatus for blast furnaces
Assignee: JFE Engineering Corp
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Filing: 1971-03-26
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Granted: 1973-09-11
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Expires: 1991-03-26
Abstract
Abstract A combustion apparatus for a blast furnace for providing complete combustion beyond the tuyeres by injecting a hot blast which is caused to swirl in a blow pipe and into the furnace, causing oxygen or oxygen enriching air to swirl in a burner and into said blow pipe and adding fuels to the burner.
Inventors
- 👤 T Shimotsuma
- 👤 K Kunioka
- 👤 T Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:29
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
In a combustion system for blast furnace, an improved combustion apparatus comprising a blow pipe for hot-blast, a swirl vane is fixed to the inside of said pipe, a burner for fuels is inserted into said pipe, a second swirl vane is fixed to the inside of the burner passage for oxygen or oxygen enrichment air and is around a center passage of the burner for the fuels, delivery side of said burner being a divergent type and the cross-sectional area of the divergent portion increases in a discontinuously manner and the portion of said burner at which the cross-sectional area increases discontinuously starts at a distance of 60 to 90 percent of said divergent portion length.
Claim 2
Dependent Claim
117 words
In a combustion system for blast furnace, an improved combustion apparatus comprising a blow pipe for hot-blast, a swirl vane is fixed to the inside of said pipe, a burner for fuels is inserted into said pipe, a second swirl vane is fixed to the inside of the burner passage for oxygen or oxygen enrichment air and is around a center passage of the burner for the fuels, delivery side of said burner being a divergent type and the cross-sectional area of the divergent portion increases in a discontinuously manner and the portion of said burner at which the cross-sectional area increases discontinuously starts at a distance of 60 to 90 percent of said divergent portion length.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |