US4669399A
Expired / Lapsed
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Method of reducing the NOx content in combustion gases
Assignee: L & C STEINMULLER FABRIKSTRASSE 1 D-5270 GUMMERSBACH GERMANY GmbH
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Filing: 1985-10-28
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Granted: 1987-06-02
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Expires: 2005-10-28
Abstract
Abstract A method of reducing the NO x content in combustion gases by introducing secondary fuel, via a liquid carrier, into the combustion chamber at a location disposed between the supply of fuel and air for the primary combustion, and the supply of secondary air for the complete combustion.
Inventors
- 👤 Helmut Martin
- 👤 Wolfgang Schreier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:12
CPC Classifications
F; F23; F23C; F23C6/00; F23C6/04; F23C6/045; F23C6/047; F23C1/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
In a method of reducing the NO x content in combustion gases by introducing a predetermined secondary fuel, via a carrier medium, into the combustion chamber at a location disposed between a lower location for the supply of fuel and air for the primary combustion and a higher location for the supply of secondary air for the complete combustion, the improvement therewith which comprises the steps of: (a) using a finely particulated solid fuel as secondary fuel; (b) introducing said secondary fuel into said combustion chamber in the form of a suspension in a noncombustible liquid carrier medium; and (c) atomizing said suspension via atomizing means selected from air, steam and gas.
Claim 2
Dependent Claim
112 words
In a method of reducing the NO x content in combustion gases by introducing a predetermined secondary fuel, via a carrier medium, into the combustion chamber at a location disposed between a lower location for the supply of fuel and air for the primary combustion and a higher location for the supply of secondary air for the complete combustion, the improvement therewith which comprises the steps of: (a) using a finely particulated solid fuel as secondary fuel; (b) introducing said secondary fuel into said combustion chamber in the form of a suspension in a noncombustible liquid carrier medium; and (c) atomizing said suspension via atomizing means selected from air, steam and gas.
Claim 3
Dependent Claim
38 words
A method according to claim 1, which includes the step of atomizing a suspension of secondary fuel in liquid carrier medium, with said suspension comprising 20-80% by weight carrier relative to the total weight of fuel and carrier.
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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |