US3910754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and methods for heat treating fine-grained materials
Assignee: ThyssenKrupp Industrial Solutions AG
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Filing: 1974-05-13
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Granted: 1975-10-07
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Expires: 1994-05-13
Abstract
Abstract Find-grained material adapted to be fired in a rotary tube furnace is preheated by being introduced to a vertical chamber in which there is a heating zone at a level lower than that at which the material enters the chamber. Prior to reaching the heating zone fuel is added to the material, after which the material is broken up and subjected to firing at the heating zone. The material thus heated is delivered to the furnace for final firing.
Inventors
- 👤 Paul Weber
- 👤 Hans Mollenkopf
- 👤 Kurt Henning
- 👤 Otto Heinemann
- 👤 Heinz-Herbert Schmits
- 👤 Wolfgang Rother
- 👤 Horst Ritzmann
- 👤 Jurgen Wurr
- 👤 Jr Karl Krutzner
- 👤 Werner Schossler
- 👤 Wolf Goldmann
- 👤 Georg Schepers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:39
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/434; F; F27; F27B; F27B7/00; F27B7/20; F27B7/2016; F27B7/2025; F27B7/2033
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
121 words
A method of preheating fine-grained material prior to its discharge to a furnace from which hot combustion gases are exhausted in a stream, said method comprising introducing said stream of gases at a first level to a preheater; introducing fine-grained material to said preheater in the path of said stream of gases, said material being introduced to said preheater at a second level above that at which said stream of gases in introduced to said preheater whereby said material may move gravitationally in a direction toward said first level; adding fuel to said material under non-combustion conditions; and subsequently combusting said fuel at a firing zone in said preheater located between said first and second levels s to preheat said material.
Claim 2
Independent Claim
121 words
A method of preheating fine-grained material prior to its discharge to a furnace from which hot combustion gases are exhausted in a stream, said method comprising introducing said stream of gases at a first level to a preheater; introducing fine-grained material to said preheater in the path of said stream of gases, said material being introduced to said preheater at a second level above that at which said stream of gases in introduced to said preheater whereby said material may move gravitationally in a direction toward said first level; adding fuel to said material under non-combustion conditions; and subsequently combusting said fuel at a firing zone in said preheater located between said first and second levels s to preheat said material.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein said stream of gases has an oxygen concentration of between 5 and 14 percent.
Claim 4
Dependent Claim
17 words
A method according to claim 1 wherein said stream of gases contains at least 2.5 percent oxygen.
Claim 5
Dependent Claim
25 words
A method according to claim 1 wherein said fuel is added to said material substantially simultaneously with the introduction of the latter to said pre-heater.
Claim 6
Dependent Claim
37 words
A method according to claim 1 including distributing said material over substantially the cross-sectional area of said pre-heater between the time that fuel is added to said material and the time said material reaches said firing zone.
Claim 7
Dependent Claim
19 words
A method according to claim 1 wherein said material is introduced to said pre-heater in a substantially solid stream.
Claim 8
Dependent Claim
16 words
A method according to claim 6 wherein said fuel is added to said stream of material.
Claim 9
Dependent Claim
33 words
A method according to claim 5 wherein said material reaches said firing zone in annular form and wherein said fuel is added to said material while the latter is in said annular form.
Claim 10
Independent Claim
97 words
A method of preheating fine-grained material prior to its discharge to a furnace, said method comprising establishing an upward flow of gas through a preheater; introducing fine-grained material in a dense stream to said preheater in the path of said gas and at a level between the upper and lower ends of said preheater whereby said material may move gravitationally downward; adding fuel to said stream of material; breaking up said stream of material following the addition of fuel thereto; and combusting said fuel following the breaking up of said stream of material to preheat said material.
Claim 11
Independent Claim
97 words
A method of preheating fine-grained material prior to its discharge to a furnace, said method comprising establishing an upward flow of gas through a preheater; introducing fine-grained material in a dense stream to said preheater in the path of said gas and at a level between the upper and lower ends of said preheater whereby said material may move gravitationally downward; adding fuel to said stream of material; breaking up said stream of material following the addition of fuel thereto; and combusting said fuel following the breaking up of said stream of material to preheat said material.
Claim 12
Dependent Claim
138 words
Apparatus for preheating fine-grained material prior to its discharge to a furnace from which hot combustion gases are exhausted in a stream, said apparatus comprising a preheater; means communicating with said preheater at a first level for introducing said stream of gases to said preheater; material inlet means communicating with said preheater at a second level above said first level for introducing a stream of fine-grained material to said preheater, whereby said material may move gravitationally in a direction toward said first level; fuel feeder means communicating with said preheater for adding fuel to the stream of material introduced to said preheater; means for combusting said fuel in said preheater at a firing zone between said first and second leveLs to preheat said material; and means for discharging preheated material and said stream of gases from said preheater.
Claim 13
Dependent Claim
138 words
Apparatus for preheating fine-grained material prior to its discharge to a furnace from which hot combustion gases are exhausted in a stream, said apparatus comprising a preheater; means communicating with said preheater at a first level for introducing said stream of gases to said preheater; material inlet means communicating with said preheater at a second level above said first level for introducing a stream of fine-grained material to said preheater, whereby said material may move gravitationally in a direction toward said first level; fuel feeder means communicating with said preheater for adding fuel to the stream of material introduced to said preheater; means for combusting said fuel in said preheater at a firing zone between said first and second leveLs to preheat said material; and means for discharging preheated material and said stream of gases from said preheater.
Claim 14
Dependent Claim
23 words
Apparatus according to claim 10 including material distributing means in said preheater at a level between said inlet means and said firing zone.
Claim 15
Dependent Claim
15 words
Apparatus according to claim 10 wherein said means for combusting said fuel comprises burner means.
Claim 16
Dependent Claim
42 words
Apparatus according to claim 10 wherein said inlet means comprises a tube through which said material may pass in a substantially solid stream, and wherein said fuel feeder means has a mouth located in a position to be covered by said stream.
Claim 17
Dependent Claim
18 words
Apparatus according to claim 13 wherein said mouth is directed in the direction of movement of said stream.
Claim 18
Dependent Claim
28 words
Apparatus according to claim 10 wherein said inlet means has a material exit end and wherein said fuel feeder means has a mouth located adjacent said exit end.
Claim 19
Dependent Claim
17 words
Apparatus according to claim 10 including material distributing means between said inlet means and said firing zone.
Claim 20
Dependent Claim
15 words
Apparatus according to claim 10 including burner means in said pre-heater at said firing zone.
Claim 21
Dependent Claim
19 words
Apparatus according to claim 17 including auxiliary burner means in said pre-heater at a level above said inlet means.
Claim 22
Dependent Claim
20 words
Apparatus according to claim 10 wherein said fuel feeder means comprises at least one lance adjustably carried by said pre-heater.
Claim 23
Dependent Claim
20 words
Apparatus according to claim 10 wherein said pre-heater has a number of vertically spaced, cross-sectional constrictions topped by funnel-shaped surfaces.
Claim 24
Dependent Claim
24 words
Apparatus according to claim 20 wherein said fuel feeder means is located in the vicinity of the funnel shaped surface of the lowermost constriction.
Claim 25
Dependent Claim
33 words
Apparatus according to claim 21 wherein said fuel feeder means comprises a number of lances having their mouths lying substantially on the diameter of said lowermost constriction and spaced about the periphery thereof.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |