US4436286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of afterburning combustible constituents of exhaust gases from rotary kilns
Assignee: GEA Group AG
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Filing: 1982-09-14
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Granted: 1984-03-13
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Expires: 2002-09-14
Abstract
Abstract In order to avoid incrustation and an excessively strong thermal attack on the afterburning chamber, the exhaust gases which contain gaseous and solid constituents which are combustible are afterburned in a plurality of stages, which are connected in series. The rate at which oxygen is supplied to each stage is so controlled that part of the combustible constituents is afterburned in each stage. The gas which is about to enter each succeeding stage is cooled by injected water.
Inventors
- 👤 Wolfram Schnabel
- 👤 Ernst Scheu
- 👤 Harry Serbent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:21
CPC Classifications
F; F27; F27D; F27D17/00; F27D17/10; F27D17/18; C; C21; C21B; C21B13/00; C21B13/08; F27D17/15; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
In a process of afterburning combustible constituents of exhaust gases from rotary kilns used for metallurgical processes, comprising afterburning the exhaust gases from the rotary kiln at a temperature above their ignition temperature in an afterburning chamber and supplying oxygen-containing gases to said afterburning chamber, the improvement comprising burning part of the combustible constituents in each of a plurality of series connected stages in said afterburner, supplying each of such stages with oxygen at a controlled rate, and cooling the gas which is about to enter each succeeding stage by injecting water to a temperature above the ignition temperature of the gas and below the caking temperature of the entrained fine dust.
Claim 2
Dependent Claim
112 words
In a process of afterburning combustible constituents of exhaust gases from rotary kilns used for metallurgical processes, comprising afterburning the exhaust gases from the rotary kiln at a temperature above their ignition temperature in an afterburning chamber and supplying oxygen-containing gases to said afterburning chamber, the improvement comprising burning part of the combustible constituents in each of a plurality of series connected stages in said afterburner, supplying each of such stages with oxygen at a controlled rate, and cooling the gas which is about to enter each succeeding stage by injecting water to a temperature above the ignition temperature of the gas and below the caking temperature of the entrained fine dust.
Claim 3
Dependent Claim
40 words
A process according to claim 1, further comprising introducing oxygen-containing gas into the first stage in an amount such that the heat produced by afterburning does not increase the gas temperature above the caking temperature of the entrained fine dust.
Claim 4
Dependent Claim
19 words
A process according to claim 1, further comprising introducing the oxygen-containing gases enter the afterburning chamber with a swirl.
Claim 5
Dependent Claim
33 words
A process according to claim 1, further comprising controlling the velocity of the oxygen-containing gases leaving the nozzles by varying the exit cross-section of the nozzle or nozzles through which it is introduced.
Claim 6
Dependent Claim
22 words
A process according to claim 3, further comprising feeding the oxygen-containing gases into successive afterburning stages with swirls in mutually opposite senses.
Claim 7
Dependent Claim
35 words
A process according to claim 1, further comprising cooling exhaust gas which is about to enter an afterburning stage to a temperature which is slightly above the ignition temperature of the gases in said stage.
Claim 8
Dependent Claim
38 words
A process according to claim 1, wherein the oxygen-containing gas supplied to the afterburner plant consists of dust-entraining air from locations where coal is unloaded and/or the locations where coal is transferred and/or from a crusher for coal.
References Cited (Backward Citations)
US3705711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |