US4409909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of combustion in a fluidized-bed incinerator
Assignee: Okawara Mfg Co Ltd
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Filing: 1981-03-17
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Granted: 1983-10-18
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Expires: 2001-03-17
Abstract
Abstract An incinerator for combusting sludge or the like is supplied with combustion air which is mixed with 5-40% by weight of a high-humidity, low-oxygen-concentration gas for adjustment of the excess ratio of combustion air and control over burning of nitrogen oxides in the incinerator. The gas is supplied from a predrier for drying the sludge or comprises a gas discharged from the incinerator.
Inventors
- 👤 Takekazu Tomizawa
- 👤 Susumu Ueda
- 👤 Toyoji Sakyo
- 👤 Sumio Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:57
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/30; F23G5/02; F23G5/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A process of combustion of particulate or powdery materials such as dried sludge, which comprises feeding said material to a predrier in which said material is dried by hot combustion products of a direct flame furnace to produce predried material and high-humidity low oxygen content exhaust gas, discharging said predried material from said predrier to a fluidized-bed incinerator, separately supplying to said incinerator an air-gas mixture comprising air and from 5-40% by weight of said high-humidity low oxygen content exhaust gas from said predrier, to thereby adjust the excess ration of combustion air and burn nitrogen oxides in the incinerator.
Claim 2
Dependent Claim
100 words
A process of combustion of particulate or powdery materials such as dried sludge, which comprises feeding said material to a predrier in which said material is dried by hot combustion products of a direct flame furnace to produce predried material and high-humidity low oxygen content exhaust gas, discharging said predried material from said predrier to a fluidized-bed incinerator, separately supplying to said incinerator an air-gas mixture comprising air and from 5-40% by weight of said high-humidity low oxygen content exhaust gas from said predrier, to thereby adjust the excess ration of combustion air and burn nitrogen oxides in the incinerator.
Claim 3
Dependent Claim
24 words
A process according to claim 1, in which a portion of the exhaust gas from said predrier is supplied to said direct flame furnace.
Claim 4
Dependent Claim
28 words
A process according to claim 1 or 2 in which the exhaust gas from said predrier is heated in a heat exchanger by combustion products of said incinerator.
Claim 5
Dependent Claim
40 words
A process according to claim 1 in which air and exhaust gas from said predrier are fed into a second direct-flame furnace in which the air-gas mixture is heated before being fed into the fluidized bed furnace as combustion air.
Claim 6
Dependent Claim
32 words
A process according to claim 1, in which exhaust gas from said predrier is passed through a cyclone which removes therefrom solids which are fed to said incinerator with said predried material.
References Cited (Backward Citations)
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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) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |