EP0499184A2
Expired / Lapsed
EP
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Combustion method for simultaneous control of nitrogen oxides and products of incomplete combustion
Assignee: Praxair Technology Inc
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Filing: 1992-02-10
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Granted: —
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Expires: 2012-02-10
Abstract
Abstract A combustion method for the simultaneous control of PICs and NOx wherein the combustion is carried out in two combustion zones. High velocity oxidant is injected into the second combustion zone to aspirate exhaust from the first combustion zone prior to combustion within the second combustion zone. The first combustion zone is preferably operated under pyrolytic conditions. <IMAGE>
Inventors
- 👤 Min-Da Ho
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 00:30
CPC Classifications
F; F23; F23C; F23C9/00; F23C9/006; F23G; F23G5/00; F23G5/08; F23G5/14; F23G5/16; F23L; F23L7/00; F23N; F23N1/00; F23N1/02; F23N1/022; F23N5/00; F23N5/003; F23C2900/00; F23C2900/06041; F23C2900/09002; F23G2202/00; F23G2202/10; F23G2202/101; F23G2202/102; F23G2207/00; F23G2207/10; F23G2207/103; F23G2209/00; F23G2209/12; F23G2209/24; F23G2900/00; F23G2900/52001; F23L2900/00; F23L2900/07005; F23L2900/07006; F23L2900/07008; F23N2237/00; F23N2237/16; Y; Y02; Y02E; Y02E20/00; Y02E20/34
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
109 words
A method for combusting material with controlled generation of both nitrogen oxides and products of incomplete combustion comprising: (A) combusting material in a first combustion zone to produce gaseous exhaust containing products of incomplete combustion; (B) passing the gaseous exhaust from the first combustion zone into a second combustion zone; (C) injecting at least one stream of oxidant having an oxygen concentration of at least 25 percent into a second combustion zone at a high velocity sufficient to aspirate gaseous exhaust into the high velocity oxidant stream(s); and (D) combusting products of incomplete combustion contained in the aspirated gaseous exhaust with high velocity oxidant within the second combustion zone.
Claim 2
Dependent Claim
17 words
The method of claim 1 wherein the high velocity oxidant is injected in a plurality of streams.
Claim 3
Dependent Claim
22 words
The method of claim 2 wherein at least two of the high velocity oxidant streams are injected in an outwardly diverging direction.
Claim 4
Dependent Claim
23 words
The method of claim 3 wherein at least two outwardly diverging streams converge with the other stream(s) downstream of the point of injection.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the high velocity oxidant is technically pure oxygen.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein the high velocity oxidant has a velocity of at least 300 feet per second.
Claim 7
Dependent Claim
16 words
The method of claim 1 further comprising the aspiration of coolant into the high velocity oxidant.
Claim 8
Dependent Claim
11 words
The method of claim 7 wherein the coolant is atomized water.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein aspiration of gaseous exhaust into the high velocity oxidant occurs upstream of the second combustion zone.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein aspiration of gaseous exhaust into the high velocity oxidant occurs within the second combustion zone.
Claim 11
Dependent Claim
26 words
The method of claim 1 wherein the aspiration of gaseous exhaust into the high velocity oxidant occurs both upstream of and within the second combustion zone.
Claim 12
Dependent Claim
18 words
The method of claim 1 wherein combustion within the first combustion zone is carried out under pyrolytic conditions.
Claim 13
Dependent Claim
19 words
The method of claim 1 wherein the combustion within the second combustion zone is carried out under oxidative conditions.
Claim 14
Dependent Claim
33 words
The method of claim 1 wherein the combustion within the first combustion zone is carried out under pyrolytic conditions and the combustion within the second combustion zone is carried out under oxidative conditions.
Claim 15
Dependent Claim
69 words
The method of claim 1 wherein the level of oxygen within the second combustion zone is maintained at a desired level by monitoring the level of oxygen within the second combustion zone or within the effluent passed out from the second combustion zone and increasing the flow of high velocity oxidant into the second combustion zone when the level of oxygen within the effluent falls below a predetermined level.
Claim 16
Dependent Claim
74 words
The method of claim 1 wherein the level of oxygen within the second combustion zone is maintained at a desired level by monitoring the level of carbon monoxide within the second combustion zone or within the effluent passed out from the second combustion zone and increasing the flow of high velocity oxidant into the second combustion zone when the level of carbon monoxide within the second combustion zone or effluent exceeds a predetermined level.
Claim 17
Dependent Claim
40 words
The method of claim 1 wherein the gaseous exhaust additionally contains products of complete combustion and further comprising aspirating products of complete combustion with the gaseous exhaust into the high velocity oxidant to serve as ballast for the combustion reaction.
Claim 18
Independent Claim
146 words
A method for operating a pyrolytic combustion zone for simultaneously controlling the generation of both nitrogen oxides and products of incomplete combustion comprising: (A) injecting into a combustion zone containing furnace gases including fuel at least one jet of oxidant at a high velocity sufficient to entrain furnace gases including fuel into the jet; (B) increasing the fuel to oxygen ratio within the jet to exceed the stoichiometric ratio while causing intense mixing of the fuel and oxidant in the combustion zone due to the high velocity jet; and (C) combusting fuel and oxidant in the combustion zone while maintaining the level of nitrogen oxides generation low because of the high fuel to oxygen ratio and while generating products of incomplete combustion because of the high fuel to oxygen ratio but limiting the amount of soot produced because of the intense mixing of fuel and oxidant.
Claim 19
Dependent Claim
15 words
The method of Claim 18 wherein a plurality of high velocity oxidant jets is employed.
Claim 20
Dependent Claim
31 words
The method of Claim 19 wherein at least two high velocity oxidant jets are injected into the combustion zone in a diverging orientation and subsequently converge downstream in the combustion zone.
Claim 21
Dependent Claim
16 words
The method of claim 18 wherein the velocity of the oxidant jet(s) exceeds the blow-off velocity.
Claim 22
Dependent Claim
19 words
The method of claim 18 wherein the high velocity oxidant jet(s) cause recirculation to occur within the combustion zone.
Claim 23
Dependent Claim
35 words
The method of claim 22 wherein at least one of steam and carbon dioxide within the combustion zone are brought to the combustion by the internal recirculation and serve to provide oxygen to the combustion.
Claim 24
Dependent Claim
21 words
The method of claim 18 further comprising passing products of incomplete combustion into a second combustion zone and combusting them therein.
Claim 25
Dependent Claim
60 words
The method of claim 24 further comprising injecting at least one stream of oxidant having an oxygen concentration of at least 25 percent into the second combustion zone at a high velocity sufficient to aspirate products of incomplete combustion into the high velocity oxidant stream(s) and combusting products of incomplete combustion with high velocity oxidant within the second combustion zone.
References Cited (Backward Citations)
No citation records indexed.
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