US5302111A
Expired / Lapsed
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Process and apparatus for pulsed combustion
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1992-07-23
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Granted: 1994-04-12
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Expires: 2012-07-23
Abstract
Abstract In at least one of the ducts for feeding a fuel and an oxidant to a burner, a device for flow pulsation is provided to cause in the duct a pulsation of the flow of fluid which is fed at a frequency lower than 3 Hz, typically lower than 1 Hz. Application for example to oxycombustible burners of industrial furnaces having high yield and low emission of nitrogen oxides.
Inventors
- 👤 Dominique Jouvaud
- 👤 Bernard Genies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:17
CPC Classifications
F; F23; F23C; F23C15/00; F23D; F23D14/00; F23D14/32; F23C2205/00; F23C2205/10; F23C2205/20; Y; Y02; Y02E; Y02E20/00; Y02E20/34; Y02P; Y02P40/00; Y02P40/50
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
63 words
Process of pulsed combustion, where a pulsation is provided to a flame of a burner discharging into an industrial furnace which is supplied with fuel and oxidant by producing cyclic variations of at least one of the flows of fuel and oxidant, wherein the oxidant contains at least 80% O 2 and the frequency of the cyclic variations is lower than 3 Hz.
Claim 2
Dependent Claim
63 words
Process of pulsed combustion, where a pulsation is provided to a flame of a burner discharging into an industrial furnace which is supplied with fuel and oxidant by producing cyclic variations of at least one of the flows of fuel and oxidant, wherein the oxidant contains at least 80% O 2 and the frequency of the cyclic variations is lower than 3 Hz.
Claim 3
Dependent Claim
14 words
Process according to claim 1, wherein the frequency is between 0.1 and 1 Hz.
Claim 4
Dependent Claim
12 words
Process according to claim 2, wherein the frequency is about 0.2 Hz.
Claim 5
Dependent Claim
26 words
Process according to claim 1, wherein the ratio between the maximum flow duration and the minimum flow duration which varies cyclically is between 0.5 and 2.
Claim 6
Dependent Claim
24 words
Process according to claim 4, wherein the ratio between the maximum flow duration and the minimum flow duration is of the order of 1.
Claim 7
Dependent Claim
24 words
Process according to claim 1, wherein the volume ratio between a minimum flow and a maximum flow which varies cyclically is lower than 0.7.
Claim 8
Dependent Claim
13 words
Process according to claim 6, wherein the volume ratio is lower than 0.5.
Claim 9
Dependent Claim
12 words
Process according to claim 7, wherein the volume ratio is about 0.25.
Claim 10
Dependent Claim
36 words
Process according to claim 7, wherein the volume ratio between a minimum flow and a flow provided with pulsations of the flow which varies cyclically is between 0.3 and 2, preferably of the order of 0.3.
Claim 11
Dependent Claim
16 words
Process according to claim 1, wherein the cyclic variations are produced in the flow of fuel.
Claim 12
Dependent Claim
22 words
Process according to claim 1, wherein the cyclic variations are produced in the flow of fuel and in the flow of oxidant.
Claim 13
Dependent Claim
24 words
Process according to claim 11, wherein the cyclic variations are carried out at a common frequency in the two flows of fuel and oxidant.
Claim 14
Dependent Claim
23 words
Process according to claim 11, wherein the cyclic variations of the flows of fuel and oxidant are dephased by at least π; 2.
Claim 15
Dependent Claim
21 words
Process according to claim 13, wherein the cyclic variations of the flows of fuel and oxidant are dephased by about π.
Claim 16
Dependent Claim
12 words
Process according to claim 1, wherein the oxidant is substantially pure oxygen.
Claim 17
Dependent Claim
12 words
Process according to claim 1, wherein the fuel is a natural gas.
Claim 18
Independent Claim
98 words
An apparatus for flame heating a furnace, comprising at least a burner having at least a first channel connectable via a first supply duct to a source of fuel and a second channel connectable via a second supply duct to a source of oxidant containing not less than 80% O 2 , the first and second channels discharging into the furnace, at least one of said first and second supply ducts is provided with pulsating means to pulse the flow of fluid supplied by said duct to the burner at a frequency comprised between 0.1 and 3 Hz.
Claim 19
Independent Claim
98 words
An apparatus for flame heating a furnace, comprising at least a burner having at least a first channel connectable via a first supply duct to a source of fuel and a second channel connectable via a second supply duct to a source of oxidant containing not less than 80% O 2 , the first and second channels discharging into the furnace, at least one of said first and second supply ducts is provided with pulsating means to pulse the flow of fluid supplied by said duct to the burner at a frequency comprised between 0.1 and 3 Hz.
Claim 20
Dependent Claim
29 words
The apparatus of claim 17, wherein each of said first and second supply ducts is provided with pulsating means operable to pulse the respective flows with a selectable dephasage.
Claim 21
Dependent Claim
20 words
Apparatus according to claim 17, wherein the pulsating means comprises an electro-valve bypassed by a neck with given minimum flow.
Claim 22
Dependent Claim
30 words
Apparatus according to claim 17, wherein the pulsating means comprises a pivot wing disposed in the duct and means are provided to produce an alternative oscillation movement of the wing.
Claim 23
Dependent Claim
48 words
Apparatus according to claim 17, wherein the pulsating means comprises a valve with a rotary valve head including a tubular wall formed with openings angularly distributed and defining a sequence of openings and closings of the flow of fluid in the valve during rotation of the valve head.
Claim 24
Dependent Claim
17 words
Apparatus according to claim 17, wherein the burner comprises two concentric channels for ejecting fuel and oxidant.
References Cited (Backward Citations)
US3819318A
Cited
WO1982000047A1
Cited
EP0046898A1
Cited
SU1039966A1
Cited
US4645448A
Cited
US4699588A
Cited
US4846665A
Cited
SU1498724A1
Cited
US4946381A
Cited
DE4026555A1
Cited
US4993938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-11 | 1997-10-11 | 1998-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-11 | 2001-10-11 | 2002-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-11 | 2005-10-11 | 2006-04-12 | $7700.00 | Window Closed / Lapsed |