US3873671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for disposal of oxides of nitrogen
Assignee: KGI Inc
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Filing: 1973-02-01
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Granted: 1975-03-25
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Expires: 1993-02-01
Abstract
Abstract A process for converting gases containing oxides of nitrogen into gases which may be safely vented to the atmosphere wherein the gases containing the oxides of nitrogen (NOx) are mixed with excess combustible products obtained by burning a hydrocarbon fuel with less than its stoichiometric requirements of oxygen, the mixture thus obtained is cooled to avoid temperatures substantially above 2,000* F. but not below about 1,200* F., the combustible material remaining after substantially all of the oxides of nitrogen have been reduced to nitrogen are oxidized, so that the resulting gas, substantially free of NOx and carbon monoxide (CO), may be vented to the surrounding atmosphere without contamination of the environment and without smoke or other particulate matter.
Inventors
- 👤 Robert D Reed
- 👤 Eugene C Mcgill
- 👤 Charles G Mcconnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:54
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/06; F23G7/061; F23G7/065; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; B01D53/56; F23C; F23C6/00; F23C6/04; F23C6/045; Y; Y02; Y02C; Y02C20/00; Y02C20/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
120 words
A PROCESS OF CONVERTING GASES CONTAINING OXIDES OF NITROGEN INTO GASES WHICH MAY BE VENTED SAFELY TO THE SURROUNDING ENVIRONMENT WHICH COMPRISES: BURNING A FUEL IN A FIRST ZONE IN THE PRESENCE OF AT LEAST 65 PERCENT BUT LESS THAN 100 PERCENT OF SAID FUEL''S STOICHIOMETRIC REQUIREMENTS OF OXYGEN; MIXING SAID GASES CONTAINING OXIDES OF NITROGEN WITH THE COMBUSTION PRODUCTS RESULTING FROM SAID BURNING IN A RATIO WHICH PROVIDES AN EXCESS OF OXIDIZABLE COMBUSTION PRODUCTS OVER OXYGEN AVAILABLE FROM SAID OXIDES; COOLING THE AFORESAID COMBUSTION MIXTURE TO MAINTAIN A TEMPERATURE THAT IS WITHIN THE RANGE BETWEEN ABOUT 2000* FAHRENHEIT AND ABOUT 1200* FAHRENHEIT; MIXING, IN A SECOND ZONE, THE OXIDIZABLE COMBUSTION PRODUCTS REMAINING AFTER SUBSTANTIALLY ALL OF THE OXIDES OF
Claim 2
Dependent Claim
120 words
A PROCESS OF CONVERTING GASES CONTAINING OXIDES OF NITROGEN INTO GASES WHICH MAY BE VENTED SAFELY TO THE SURROUNDING ENVIRONMENT WHICH COMPRISES: BURNING A FUEL IN A FIRST ZONE IN THE PRESENCE OF AT LEAST 65 PERCENT BUT LESS THAN 100 PERCENT OF SAID FUEL''S STOICHIOMETRIC REQUIREMENTS OF OXYGEN; MIXING SAID GASES CONTAINING OXIDES OF NITROGEN WITH THE COMBUSTION PRODUCTS RESULTING FROM SAID BURNING IN A RATIO WHICH PROVIDES AN EXCESS OF OXIDIZABLE COMBUSTION PRODUCTS OVER OXYGEN AVAILABLE FROM SAID OXIDES; COOLING THE AFORESAID COMBUSTION MIXTURE TO MAINTAIN A TEMPERATURE THAT IS WITHIN THE RANGE BETWEEN ABOUT 2000* FAHRENHEIT AND ABOUT 1200* FAHRENHEIT; MIXING, IN A SECOND ZONE, THE OXIDIZABLE COMBUSTION PRODUCTS REMAINING AFTER SUBSTANTIALLY ALL OF THE OXIDES OF
Claim 3
Dependent Claim
26 words
A process of claim 1 including the step of: injecting a cooling fluid to maintain the temperature of said second zone substantially less than 2000* Fahrenheit.
Claim 4
Dependent Claim
20 words
A process of claim 1 wherein said required oxygen for such fuel burning is furnished by air and nitrogen oxides.
Claim 5
Dependent Claim
32 words
The process of claim 1 wherein the cooling of said combustion mixture comprises the steps of: cooling said resultant gas product, and controllably injecting said cooled gas product into said combustion mixture.
Claim 6
Dependent Claim
19 words
The process of claim 2 wherein at least a portion of said cooling fluid is cooled resultant gas product.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein said cooling of said combustion mixture in said first zone occurs by indirect contact heat exchange with a cooler fluid.
Claim 8
Dependent Claim
30 words
The process of claim 1 including the step of maintaining the temperature of said second zone substantially less than 2,000* F by indirect contact heat exchange with a cooler fluid.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein cooling the aforesaid combustion mixture occurs by feeding substantially oxygen free fluid into the zone of said burning of said fuel.
Claim 10
Dependent Claim
10 words
A process of claim 8 wherein said fluid is nitrogen.
Claim 11
Dependent Claim
11 words
The process of claim 8 wherein said fluid is carbon dioxide.
Claim 12
Dependent Claim
13 words
The process of claim 8 wherein said fluid is water or water vapor.
Claim 13
Dependent Claim
15 words
The process of claim 1 wherein water or water vapor is injected with said fuel.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |