Patent US3706520A successfully refreshed from Google Patents.
US3706520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for heating shaft furnaces with fuel gas
Assignee: Shell USA Inc
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Filing: 1971-08-20
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Granted: 1972-12-19
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Expires: 1991-08-20
Abstract
Abstract An improved fuel gas burner for vertical shaft furnaces has separately controllable fuel and air supply means for controlling combustion in addition to primary fuel and air supply means for supplying the main portion of these combustion gases.
Inventors
- 👤 Werner Grimm
- 👤 Karl H Olschewski
- 👤 Rolf E Sack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:07
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/005; F23; F23D; F23D14/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
An improved shaft-furnace fuel gas burner of the type having a central supply line and distribution chamber for a first portion of combustion air; an annular supply line and annular distribution chamber for fuel gas surrounding the central air supply line; and, surrounding the annular fuel gas supply line, an outer supply line comprising two adjacent, concentric annular passageways one surrounding the other for a second portion of combustion air, the two passageways being in fluid communication at the top portions thereof whereby air may be passed upwardly through the innermost of the passageways to cool the fuel gas in the annular fuel gas supply line and then downwardly away from the top of the burner to a point of combustion air introduction near the bottom of the furnace, the improvement comprising: a second supply line and a second distribution chamber for fuel gas, and means for adjusting the supply of fuel to said second fuel supply line to control the combustion zone of the burner.
Claim 2
Dependent Claim
166 words
An improved shaft-furnace fuel gas burner of the type having a central supply line and distribution chamber for a first portion of combustion air; an annular supply line and annular distribution chamber for fuel gas surrounding the central air supply line; and, surrounding the annular fuel gas supply line, an outer supply line comprising two adjacent, concentric annular passageways one surrounding the other for a second portion of combustion air, the two passageways being in fluid communication at the top portions thereof whereby air may be passed upwardly through the innermost of the passageways to cool the fuel gas in the annular fuel gas supply line and then downwardly away from the top of the burner to a point of combustion air introduction near the bottom of the furnace, the improvement comprising: a second supply line and a second distribution chamber for fuel gas, and means for adjusting the supply of fuel to said second fuel supply line to control the combustion zone of the burner.
Claim 3
Dependent Claim
93 words
The burner of claim 1 wherein, when the burner is vertically disposed in the shaft furnace, the annular discharge chamber for fuel gas is positioned below the distribution chamber for the first portion of combustion air and wherein the second distribution chamber for fuel gas is positioned above the distribution chamber for the first portion of combustion air, the second fuel supply line being located within the central air supply line and passing upwardly through the distribution chamber for the first portion of combustion air to the second distribution chamber for fuel gas.
Claim 4
Independent Claim
178 words
A method for heating vertical shaft furnaces with fuel gas comprising the steps of: introducing a combustion control portion of fuel gas into the furnace through a central conduit in a burner; introducing a combustion control portion of air into the furnace through an annular discharge chamber of the burner positioned below the point of introduction of the combustion control portion of fuel gas; introducing a main portion of fuel gas into the furnace through an annular fuel-discharge chamber of the burner positioned below the point of introduction of the combustion control portion of air; passing a main portion of air through the burner to cool the main portion of fuel gas before it enters the annular fuel-discharge chamber; conducting the main portion of air to a point adjacent the furnace bottom; and introducing the main portion of combustion air into the furnace adjacent the bottom thereof and below the burner whereby the main portion of air rises through the furnace and diffusely combines with fuel gas introduced into the furnace through the burner to heat the furnace.
Claim 5
Independent Claim
178 words
A method for heating vertical shaft furnaces with fuel gas comprising the steps of: introducing a combustion control portion of fuel gas into the furnace through a central conduit in a burner; introducing a combustion control portion of air into the furnace through an annular discharge chamber of the burner positioned below the point of introduction of the combustion control portion of fuel gas; introducing a main portion of fuel gas into the furnace through an annular fuel-discharge chamber of the burner positioned below the point of introduction of the combustion control portion of air; passing a main portion of air through the burner to cool the main portion of fuel gas before it enters the annular fuel-discharge chamber; conducting the main portion of air to a point adjacent the furnace bottom; and introducing the main portion of combustion air into the furnace adjacent the bottom thereof and below the burner whereby the main portion of air rises through the furnace and diffusely combines with fuel gas introduced into the furnace through the burner to heat the furnace.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |