US4648331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the reduction of NOx in fluidized-bed furnaces
Assignee: Steag GmbH
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Filing: 1985-03-04
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Granted: 1987-03-10
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Expires: 2005-03-04
Abstract
Abstract In a process for lowering the NO x content in combustion waste gases with the use of a reducing agent, the reducing agent has heretofore been added in all cases to the combustion gases downstream of the incineration. According to the invention, it is suggested in a fluidized-bed incineration to introduce the reducing agent into the fluidized bed. It is preferred, in this connection, to admix reducing agent to the utilized fuel and/or to the combustion air and/or to introduce the reducing agent directly into the incineration. Especially preferred reducing agents are NH 3 or nitrogen-containing hydrocarbon compounds. Various additional versions of the feeding operation are possible.
Inventors
- 👤 Franz Thelen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:15
CPC Classifications
F; F23; F23J; F23J7/00; C; C10; C10L; C10L10/00; C10L10/02; C10L9/00; C10L9/10; F23C; F23C10/00; F23C10/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
A process for the reduction of NO x content in combustion waste gases, comprising introducing into the fluidized bed of a fluidized bed incineration, a reducing agent selected from the group consisting of NH 3 and a nitrogen-containing hydrocarbon compound, and maintaining the temperature of the fluidized bed about 800°-950° C.
Claim 2
Dependent Claim
51 words
A process for the reduction of NO x content in combustion waste gases, comprising introducing into the fluidized bed of a fluidized bed incineration, a reducing agent selected from the group consisting of NH 3 and a nitrogen-containing hydrocarbon compound, and maintaining the temperature of the fluidized bed about 800°-950° C.
Claim 3
Dependent Claim
16 words
A process as claimed in claim 1, in which said reducing agent is NH 3 .
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1, in which said reducing agent is an aqueous solution of NH 3 .
References Cited (Backward Citations)
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JPS5217217A
Cited
DE2535357A1
Cited
DE2852800A1
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US4284015A
Cited
US4388877A
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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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |