US3860384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method to control NOX formation in fossil-fueled boiler furnaces
Assignee: Intelcon Rad Technology
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Filing: 1972-05-25
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Granted: 1975-01-14
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Expires: 1992-05-25
Abstract
Abstract The invention is directed to a method and apparatus for reducing the nitrogen oxide content of flue gases produced during operation of an external combustion engine or furnace. In the method moisture is dispersed into preheated combustion air prior to entrance of the combustion air into the combustion chamber of an external combustion engine or furnace.
Inventors
- 👤 William G Vulliet
- 👤 Wolfram G Schuetzenduebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:25
CPC Classifications
F; F23; F23L; F23L7/00; F23L7/002; F23L7/005; F02; F02M; F02M25/00; F02M25/022; F02M25/025; F02M25/028; F23B; F23B5/00; F23B2700/00; F23B2700/022; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A METHOD FOR REDUCING THE NITROGEN OXIDE CONTENT OF THE FLUE GAS OF EXTERNAL COMBUSTION FURNACES COMPRISING PREHEATING THE COMBUSTION AIR AND THEREAFTER ADDING TO SAID PREHEATED COMBUSTION AIR PRIOR TO INTRODUCTION OF SAID PREHEATED COMBUSTION AIR INTO A COMBUSTION CHAMBER A PREDETERMINED LEVEL OF MOISTURE, SAID MOISTURE BEING ADDED AT A LEVEL OF FROM ABOUT 2 PERCENT, BY WWIGHT TO ABOUT 6 PERCENT BY WEIGHT OF SAID COMBUSTION AIR, SAID COMBUSTION AIR BEING PREHEATED TO A TEMPERATURE SUCH THAT THE RELATIVE HUMIDITY OF THE COMBUSTION AIR AFTER ADDITION OF SAID MOISTURE IS LESS THAN ABOUT 25 PERCENT AND SAID MOISTURE BEING FULLY EVAPORATED PRIOR TO INTRODUCTION OF SAID COMBUSTION AIR INTO SAID COMBUSTION CHAMBER.
Claim 2
Independent Claim
115 words
A METHOD FOR REDUCING THE NITROGEN OXIDE CONTENT OF THE FLUE GAS OF EXTERNAL COMBUSTION FURNACES COMPRISING PREHEATING THE COMBUSTION AIR AND THEREAFTER ADDING TO SAID PREHEATED COMBUSTION AIR PRIOR TO INTRODUCTION OF SAID PREHEATED COMBUSTION AIR INTO A COMBUSTION CHAMBER A PREDETERMINED LEVEL OF MOISTURE, SAID MOISTURE BEING ADDED AT A LEVEL OF FROM ABOUT 2 PERCENT, BY WWIGHT TO ABOUT 6 PERCENT BY WEIGHT OF SAID COMBUSTION AIR, SAID COMBUSTION AIR BEING PREHEATED TO A TEMPERATURE SUCH THAT THE RELATIVE HUMIDITY OF THE COMBUSTION AIR AFTER ADDITION OF SAID MOISTURE IS LESS THAN ABOUT 25 PERCENT AND SAID MOISTURE BEING FULLY EVAPORATED PRIOR TO INTRODUCTION OF SAID COMBUSTION AIR INTO SAID COMBUSTION CHAMBER.
Claim 3
Dependent Claim
27 words
A method in accordance with claim 1 wherein said combustion air is preheated to a temperature of at least about 120*F prior to addition of said moisture.
Claim 4
Dependent Claim
28 words
A method in accordance with claim 1 wherein said combustion air is preheated to a temperature of at least about 200* F prior to addition of said moisture.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |