US3690627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative air heater such as hot blast stove
Assignee: KONINKLIJKE NEDERLANDSCHE HOOGOVENS EN STAALFABRIKEN NV
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Filing: 1971-03-08
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Granted: 1972-09-12
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Expires: 1991-03-08
Abstract
Abstract The blast stove comprises a preferably cylindrical hollow vertical body of refractory bricks closed at the top by a dome of refractory bricks overlying and protruding radially outside the vertical body at the top thereof, the entire body and dome is surrounded by a jacket of steel, and the dome is built up on and is supported by a steel annular element which is in a gas-tight manner connected to the outer steel jacket of the dome and of the vertical cylindrical body, the connection of the said annular element to the steel jacket of the vertical body and/or of the dome extending with respect to the axis of the vertical body alternately in a mainly radial and in mainly axial directions, this annular element being supported by a row of brackets secured to the outer jacket of the vertical body at a larger distance downwards from the upper edge of the vertical body than where the connection of the annular element to the vertical body is positioned, and preferably at at least twice the last mentioned distance. Several species and auxiliary features are also disclosed.
Inventors
- 👤 Cornelis Van Herk
- 👤 Johannes Cornelis Mes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:04
CPC Classifications
C; C21; C21B; C21B9/00; F; F28; F28D; F28D17/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
199 words
A regenerative air heater such as a hot blast stove for a blast furnace plant, comprising a preferably cylindrical hollow vertical body of refractory bricks closed at the top by a dome of refractory bricks overlying and protruding radially outside said vertical body at the top thereof, the entire structure being surrounded by a jacket of steel of the vertical body and of the dome, characterized in that the dome is built up on and is supported by a steel annular element which is in a gas-tight manner connected to the outer steel jacket of the dome and of the vertical cylindrical body, the connection of the said annular element to the steel jacket of the vertical body and/or of the dome extending with respect to the axis of the vertical body alternately in a mainly radial and in mainly axial directions and that this annular element is supported by a row of brackets secured to the outer jacket of the vertical body at a larger distance downwards from the upper edge of the vertical body than where the connection of the annular element to the vertical body is positioned, and preferably at at least twice the lastmentioned distance.
Claim 2
Dependent Claim
199 words
A regenerative air heater such as a hot blast stove for a blast furnace plant, comprising a preferably cylindrical hollow vertical body of refractory bricks closed at the top by a dome of refractory bricks overlying and protruding radially outside said vertical body at the top thereof, the entire structure being surrounded by a jacket of steel of the vertical body and of the dome, characterized in that the dome is built up on and is supported by a steel annular element which is in a gas-tight manner connected to the outer steel jacket of the dome and of the vertical cylindrical body, the connection of the said annular element to the steel jacket of the vertical body and/or of the dome extending with respect to the axis of the vertical body alternately in a mainly radial and in mainly axial directions and that this annular element is supported by a row of brackets secured to the outer jacket of the vertical body at a larger distance downwards from the upper edge of the vertical body than where the connection of the annular element to the vertical body is positioned, and preferably at at least twice the lastmentioned distance.
Claim 3
Dependent Claim
19 words
An air heater according to claim 1, characterized in that the annular element is rigidly secured to the brackets.
Claim 4
Dependent Claim
49 words
An air heater according to claim 1, characterized in that the annular element is immediately rigidly connected to the outer jacket of the dome, so without intermediary parts, but is connected to the outer jacket of the vertical body by a connecting part which extends alternately in different directions.
Claim 5
Dependent Claim
28 words
An air heater according to claim 3, characterized in that the connecting part includes three curved parts which in total occupy an angle of 200* to 350* .
Claim 6
Dependent Claim
34 words
An air heater according to claim 1, characterized in that the annular element has the shape of a frustoconical body and that the lower edge of the dome is positioned perpendicularly to this element.
Claim 7
Dependent Claim
34 words
An air heater according to claim 1, characterized in that the annular element is provided with means for arresting the position of the lower edge of the inner refractory brick dome against radial movement.
Claim 8
Dependent Claim
26 words
An air heater according to claim 1, characterized in that an outer flange of the brackets smoothly merges into the outer metal jacket of the dome.
Claim 9
Dependent Claim
42 words
An air heater according to claim 1, characterized in that the space between the dome, the vertical body and the connecting part between annular element and outer jacket of the vertical body is at least in part filled with deformable refractory material.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |