A burner assembly is provided for combining oxygen and fuel to produce a flame. The burner assembly includes a burner block formed to include a flame chamber having inlet and outlet openings, a bypass structure for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber and structure for discharging fuel into the flame chamber formed in the burner block.
|
1. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber,
an oxygen-supply housing including chamber means for receiving a supply of oxygen and a base wall adjacent to the burner block, the base wall being formed to include first aperture means for discharging oxygen from the chamber means into the flame chamber and second aperture means for discharging oxygen from the chamber means into the bypass means, said first and second aperture means metering the supply of oxygen passing therethrough, and
means for discharging fuel into the flame chamber formed in the burner block, the discharging means including a nozzle extending through the chamber means and the first aperture means formed in the base wall and supported by the base wall to discharge fuel into the flame chamber.
0. 69. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
an oxygen-supply housing defining an oxygen chamber configured to receive a supply of oxygen and a base wall positioned to lie adjacent to the burner block, the base wall being formed to include an aperture positioned to lie in alignment with the inlet opening and to pass oxygen from the oxygen chamber into the flame chamber,
a fuel-discharge nozzle configured to discharge fuel,
a removable collar engaging the oxygen-supply housing and the fuel-discharge nozzle, the collar being formed to support the fuel-discharge nozzle within the inlet opening of the burner block to discharge fuel into the flame chamber formed in the burner block,
wherein the removable collar engages the fuel-discharge nozzle and threadedly engages the oxygen-supply housing, and
wherein the oxygen-supply housing includes an annular lip defining a cylindrical nozzle aperture receiving the nozzle and the removable collar includes an annular side wall surrounding and engaging the annular lip.
16. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber,
means for discharging fuel into the flame chamber formed in the burner block, and
an oxygen-supply housing including chamber means for receiving a supply of oxygen and a base wall adjacent to the burner block, the base wall being formed to include first aperture means for discharging oxygen from the chamber means into the flame chamber and second aperture means for discharging oxygen from the chamber means into the bypass means, said first and second aperture means metering the supply of oxygen passing therethrough, the oxygen-supply housing including a hollow shell appended to the base wall to define the chamber means therebetween, wherein the hollow shell has a pyramidal shape and includes at least one triangular side wall appended to the base wall and formed to include an oxygen-admission port, and wherein the means for discharging fuel extends through the base wall.
21. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber, means for discharging fuel into the flame chamber formed in the burner block, and
an oxygen-supply housing including chamber means for receiving a supply of oxygen and a base wall adjacent to the burner block, the base wall being formed to include first aperture means for discharging oxygen from the chamber means into the flame chamber and second aperture means for discharging oxygen from the chamber means into the bypass means, said first and second aperture means metering the supply of oxygen passing therethrough the oxygen-supply housing including a hollow shell appended to the base wall to define the chamber means therebetween, wherein the hollow shell includes a tip and a side wall extending between the tip and the base wall, the tip is formed to include an aperture, and the discharging means includes a nozzle supported by the base wall and extending through the aperture formed in the tip and the first aperture means formed in the base wall and terminating in the inlet opening of the flame chamber.
0. 76. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
an oxygen conductor conduit configured to conduct oxygen outside of the flame chamber to the outlet opening of the flame chamber,
an oxygen-supply housing defining an oxygen chamber configured to receive a supply of oxygen and a base wall positioned to lie adjacent to the burner block, the base wall being formed to include a first-stage aperture in alignment with the inlet opening to pass oxygen from the oxygen chamber into the flame chamber and a second-stage aperture arranged to lie in spaced-apart relation to the first-stage aperture to pass oxygen from the oxygen chamber into the oxygen conductor conduit,
a fuel-discharge nozzle extending the oxygen chamber and the first-stage aperture formed in the base wall to discharge fuel into the flame chamber,
further comprising a removable collar engaging the fuel-discharge nozzle and threadedly engaging the oxygen-supply housing, and
wherein the oxygen-supply housing includes an annular lip defining a cylindrical nozzle aperture receiving the fuel-discharge nozzle and the removable collar includes an annular side wall surrounding and engaging the annular lip.
37. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber,
means for discharging fuel into the flame chamber formed in the burner block, and
an oxygen-supply housing including chamber means for receiving a supply of oxygen and a base wall adjacent to the burner block, the base wall being formed to include first aperture means for discharging oxygen from the chamber means into the flame chamber and second aperture means for discharging oxygen from the chamber means into the bypass means, said first and second aperture means metering the supply of oxygen passing therethrough, the discharging means including a fuel discharge nozzle and means for fixing the fuel discharge nozzle in the inlet opening, the fixing means being positioned to lie between the base wall and the burner block, the fixing means being formed to include third aperture means for conducting oxygen discharged through the first aperture means into the flame chamber, the third aperture means defining a first-stage oxygen port having a first effective cross-sectional area and communicating oxygen from the chamber means into the flame chamber, the second aperture means defining a second-stage oxygen port having a second effective cross-sectional area less than the first effective cross-sectional area and communicating oxygen from the chamber means to the outlet opening of the flame chamber through the bypass means.
40. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
a nozzle including means for discharging fuel into the flame chamber formed in the burner block,
means for fixing the nozzle adjacent to the burner block to position the discharging means at the inlet opening of the flame chamber so that a primary combustion zone is established in the flame chamber between the inlet and outlet openings,
means for supplying oxygen to the flame chamber through the inlet opening so that the oxygen supplied by the supplying means mixes with the fuel discharged by the nozzle in a first-stage region inside the flame chamber to produce a combustible mixture that can be ignited in the primary combustion zone to define a flame having a root portion in the flame chamber and a tip portion outside the flame chamber,
first-stage metering means for metering the flow rate of oxygen from the supplying means into the flame chamber through the inlet opening, the first-stage metering means being appended to the nozzle,
bypass means for delivering oxygen from the supplying means into a downstream second-stage region containing a portion of the flame and lying outside the flame chamber to supplement oxygen supplied to the first-stage region inside the flame chamber by the supplying means, and
second-stage metering means for metering the flow rate of oxygen from the supplying means into the bypass means so that the downstream second-stage region outside the flame chamber through the bypass means is fixed in proportion to the flow rate of oxygen passing through the first-stage metering means.
36. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber,
means for discharging fuel into the flame chamber formed in the burner block,
an oxygen-supply housing including chamber means for receiving a supply of oxygen and a base wall adjacent to the burner block, the base wall being formed to include first aperture means for discharging oxygen from the chamber means into the flame chamber and second aperture means for discharging oxygen from the chamber means into the bypass means, said first and second aperture means metering the supply of oxygen passing therethrough, the burner block being formed to include at least one oxygen-admission port lying adjacent to the base wall and communicating with the second aperture means and the bypass means being coupled to the oxygen-admission port and arranged to pass through the burner block to conduct oxygen from the chamber means through the burner block to the outlet opening of the flame chamber, the second aperture means including a plurality of wall apertures formed in the base wall, the burner block being formed to include an oxygen-admission port communicating with each wall aperture, and frame means for supporting the burner block, the base wall being mounted on the frame means, the burner block being formed to include an annular channel around the inlet opening of the flame chamber, the frame means including means for covering the annular channel to define an annular oxygen-conducting passageway therein and means for communicating oxygen discharged from the chamber means through the wall apertures to the annular oxygen-conducing passageway for delivery to the outlet opening of the flame chamber through the bypass means, and wherein the means for discharging fuel is supported by the base wall.
2. The burner assembly of
3. The burner assembly of
4. The burner assembly of
5. The burner assembly of
6. The burner assembly of
7. The burner assembly of
8. The burner assembly of
9. The burner assembly of
10. The burner assembly of
11. The burner assembly of
12. The burner assembly of
13. The burner assembly of
14. The burner assembly of
15. The burner assembly of
17. The burner assembly of
18. The burner assembly of
19. The burner assembly of
20. The burner assembly of
22. The burner of
23. The burner assembly of
24. The burner assembly of
25. The burner assembly of
26. The burner assembly of
27. The burner assembly of
28. The burner assembly of
0. 29. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber,
means for discharging fuel into the flame chamber formed in the burner block, and
an oxygen-supply housing including chamber means for receiving a supply of oxygen and a base wall adjacent to the burner block, the base wall being formed to include first aperture means for discharging oxygen from the chamber means into the flame chamber and second aperture means for discharging oxygen from the chamber means into the bypass means, the oxygen-supply housing further including a hollow shell appended to the base wall to define the chamber means therebetween and modular fastening means for selectively connecting the base wall to the burner block to position the first aperture means in confronting relation to the inlet opening of the frame chamber so that the oxygen-supply housing can be disconnected from the burner block during rehabilitation of the burner assembly, the modular fastening means including a frame positioned to lie between the base wall and the burner block, means for coupling the frame to the burner block, and fasteners interconnecting the base wall and the frame.
0. 30. The burner assembly of
0. 31. The burner assembly of
0. 32. The burner assembly of
0. 33. The burner assembly of
34. The burner assembly of
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber,
means for discharging fuel into the flame chamber formed in the burner block,
an oxygen-supply housing including a chamber means for receiving a supply of oxygen and a base wall adjacent to the burner block, the base wall being formed to include first aperture means for discharging oxygen from the chamber means into the flame chamber and second aperture means for discharging oxygen from the chamber means into the bypass means, said first and second aperture means metering the supply of oxygen passing therethrough, and with the oxygen-supply housing further including a hollow shell appended to the base wall to define the chamber means therebetween the modular fastening means for selectively connecting the base wall to the burner block to position the first aperture means in confronting relation to the inlet opening of the flame chamber so that the oxygen-supply housing can be disconnected from the burner block during rehabilitation of the burner assembly, the modular fastening means including a frame positioned to lie between the base wall and the burner block, means for coupling the frame to the burner block, the fasteners interconnecting the base wall and the frame, and
wherein the burner block is formed to include a plurality of oxygen-conducting passageways defining the bypass means and an annular channel surrounding the inlet opening of the flame chamber and interconnecting each of the oxygen-conducting passageways, the frame includes means for covering the annular channel to define a circular oxygen-conducting passageway between the frame and the burner block and at least one oxygen-conducting channel interconnecting the second aperture means formed in the base wall and the circular oxygen-conducting passageway.
35. The burner assembly of
38. The burner assembly of
39. The burner assembly of
41. The burner assembly of
42. The burner assembly of
43. The burner assembly of
44. The burner assembly of
45. The burner assembly of
46. The burner assembly of
47. The burner assembly of
48. The burner assembly of
49. The burner assembly of
50. The burner assembly of
51. The burner assembly of
52. The burner assembly of
53. The burner assembly of
0. 54. A burner assembly for combining oxygen and fuel to produce a flame, the burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening,
bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber,
an oxygen-supply housing including chamber means for receiving a supply of oxygen,
frame means for coupling the oxygen-supply housing to the burner block,
a fuel nozzle module having a nozzle body and a discharge tip, and
means for supporting the nozzle body of the fuel nozzle module in the chamber means to aim the discharge tip of the fuel nozzle module into the inlet opening of the flame chamber.
0. 55. The burner assembly of
0. 56. The burner assembly of
0. 57. The burner assembly of
0. 58. The burner assembly of
0. 59. The burner assembly of
0. 60. A burner assembly comprising
a burner block formed to include a flame chamber having an inlet opening and an outlet opening, and
an oxygen-supply housing including a base wall and a hollow shell appended to the base wall to define an oxygen-supply chamber for receiving a supply of oxygen, the base wall being formed to include an oxygen-discharge aperture, the base wall being fixed to lie adjacent to the burner block to place the oxygen-discharge aperture in the base wall in fluid communication with the inlet opening in the burner block to allow oxygen to pass from the oxygen-supply chamber to the flame chamber through the oxygen-discharge aperture, the hollow shell having a pyramidal shape and a plurality of triangular side walls.
0. 61. The burner assembly of
0. 62. The burner assembly of
0. 63. The burner assembly of
0. 64. The burner assembly of
0. 65. The burner assembly of
0. 66. The burner assembly of
0. 67. The burner assembly of
0. 68. The burner assembly of
0. 70. The burner assembly of
0. 71. The burner assembly of
0. 72. The burner assembly of
0. 73. The burner assembly of
0. 74. The burner assembly of
0. 75. The burner assembly of
0. 77. The burner assembly of
|
|||||||||||||||||||||||
This application is a continuation-in-part of application Ser. No. 08/092,008, filed Jul. 15, 1993, now U.S. Pat. No. 5,431,559, issued on Jul. 11, 1995.
The present invention relates to burner assemblies, and particularly to oxygen-fuel burner assemblies. More particularly, the present invention relates to a burner having a fuel-delivery system and a staged oxygen-supply system.
One challenge facing the burner industry is to design an improved burner that produces lower nitrogen oxide emissions during operation than conventional burners. Typically, an industrial burner discharges a mixture of fuel and either air or oxygen. A proper ratio of fuel and air is established to produce a combustible fuel and air mixture. Once ignited, this combustible mixture burns to produce a flame that can be used to heat various products in a wide variety of industrial applications. Combustion of fuels such as natural gas, oil, liquid propane gas, low BTU gases, and pulverized coals often produce several unwanted pollutant emissions such as nitrogen oxides (NOx), carbon monoxide (CO), and unburned hydrocarbons (UHC).
Burners that combine oxygen with an atomized fuel and oxygen mixture to produce a combustible mixture are known. See, for example, U.S. Pat. No. 5,092,760 to Brown and Coppin. Burners having oxygen-enrichment systems are also known as disclosed in the IHEA Combustion Technology Manual, Fourth Edition (1988), pp. 320-21, published by The Industrial Heating Equipment Association of Arlington, Va.
Burners were developed to burn a mixture of fuel and pure oxygen in an attempt to lower the amount of NOx produced during combustion. Atmospheric combustion air contains approximately 79% nitrogen (N2) and pure oxygen contains no nitrogen. It has been observed that the higher flame temperatures brought on by burning a mixture of fuel and pure oxygen has caused the conversion of fuel-bound N2 into NOx to increase. Additionally, new technology that allows on-site generation of combustion oxygen has been developed by oxygen suppliers. This on-site generated oxygen is not pure and can contain as much as 10% nitrogen by volume. This additional nitrogen, in contact with the high-temperature oxy-fuel flame, represents an additional source of NOx emissions.
A burner assembly designed to burn fuel more completely using a lower flame temperature would lead to lower nitrogen oxide emissions. What is needed is a burner assembly that is able to burn a fuel and oxygen mixture without generating a lot of unwanted nitrogen oxide emissions. A staged oxygen burner designed to direct oxygen to various regions of a flame produced by the burner using modular components and easily manufactured precision oxygen-flow metering apparatus would lead to lower nitrogen oxide emissions and thus be a welcomed improvement over conventional burner assemblies. Ideally, an improved staged oxygen burner would be configured to accept various fuel nozzles to permit a user to burn either fuel gas or fuel oil at the option of the user.
According to the present invention, a burner assembly is provided for combining oxygen and fuel to produce a flame. The burner assembly includes a burner block formed to include a flame chamber having inlet and outlet openings, bypass means for conducting oxygen outside of the flame chamber to the outlet opening of the flame chamber, and means for discharging fuel into the flame chamber formed in the burner block.
The burner assembly also includes an oxygen-supply housing including chamber means for receiving a supply of oxygen and a base wall adjacent to the burner block. The base wall is formed to include first aperture means for discharging oxygen from the chamber means into the flame chamber and second aperture means for discharging oxygen from the chamber means into the bypass means.
In preferred embodiments, pure oxygen under pressure is admitted into the chamber means. Some of this pressurized oxygen is discharged into the inlet opening of the flame chamber through the first aperture means formed in the base wall. The rest of this pressurized oxygen is discharged from the chamber means through the second aperture means formed in the base wall to bypass the flame chamber and follow predetermined paths to the outlet opening of the flame chamber.
Illustratively, a flow-metering device is provided to control flow of oxygen discharged through the first aperture means into the inlet opening of the flame chamber. The flow-metering device is formed to include a first-stage oxygen port controlling flow of oxygen into the inlet opening of the flame chamber. The second aperture means defines a second-stage oxygen port controlling flow of oxygen to the outlet opening of the flame chamber.
By establishing a fixed ratio between the effective cross-sectional area of the first-stage oxygen port and the effective cross-sectional area of the second-stage oxygen port, it is possible to proportion and control the relative flow of oxygen to each of the inlet and outlet openings of the flame chamber. Illustratively, a first set of holes is formed in the flow-metering device to define the first-stage oxygen port and a second set of holes is formed in the base wall to define the second-stage oxygen port. Advantageously, it is possible to change the fixed ratio described above simply by varying the diameter of the holes formed in the base wall at the time that those holes are created (e.g., drilled or milled).
Some of the pressurized oxygen discharged from the oxygen-supply housing chamber means (i.e., “first-stage oxygen”) passes through the first aperture means and the first-stage oxygen port formed in the flow-metering device and then mixes with fuel provided by the discharging means in a first-stage region inside the flame chamber. This combustible fuel and oxygen mixture can be ignited to define a flame having a root portion in the flame chamber and a tip portion outside the flame chamber.
The burner block is also formed to include oxygen-discharge ports around the outlet opening of the flame chamber and oxygen-conducting means for conducting oxygen along one or more paths through the burner block and outside of the flame chamber to the oxygen-discharge ports. The rest of the pressurized oxygen discharged from the oxygen-supply housing chamber means passes through the second aperture means formed in the base wall into the oxygen-conducting means formed in the burner block. This “second-stage” oxygen passes through the oxygen-discharge ports and is ejected from the burner block into a downstream second-stage region containing a portion of the flame and lying outside the flame chamber.
In preferred embodiments, the burner block is made of a refractory material and includes an outside wall formed to include the flame chamber inlet opening and a plurality of oxygen-admission ports around the inlet opening. The burner block also includes a furnace wall configured to lie in a furnace and formed to include the flame chamber outlet opening and the plurality of oxygen-discharge ports around the outlet opening.
Illustratively, the burner block is also formed to include a plurality of oxygen-conducting passageways. These passageways are formed during casting of the burner block. Each passageway extends through the burner body to connect one of the oxygen-admission ports to one of the oxygen-discharge ports. Essentially, these passageways are arranged to bypass the flame chamber and deliver second-stage oxygen to the second-stage region downstream of the flame chamber. Illustratively, the second-stage region lies in a furnace adjacent to the burner block and the flame produced by the burner assembly heats products in the furnace.
The oxygen-supply housing is provided to hold temporarily a supply of pressurized combustion oxygen for use in the burner assembly. In use, a continuous stream of pressurized oxygen is admitted into the oxygen-supply housing using any suitable means. Some of that pressurized oxygen is distributed to the first-stage region through the first aperture means and the rest of that pressurized oxygen is distributed by the bypass means to the second-stage region using the oxygen-conducting passageways formed in the burner block.
The burner assembly in accordance with the present invention introduces combustion oxygen into two regions or combustion zones. The first-stage combustion zone is near the root of the flame inside the flame chamber and the second-stage combustion zone is in the furnace itself in a location downstream from the flame chamber and nearer to the tip of the flame. Advantageously, by withholding a portion of the combustion oxygen from the root of the flame, the fuel partially burns and the fuel-bound nitrogen is converted into reducing agents. These nitrogenous compounds are subsequently oxidized to elemental nitrogen, thereby minimizing the generation of fuel nitrogen oxides. Also, the peak flame temperature is lowered in the fuel-rich first-stage combustion zone since the generated heat dissipates rapidly. This reduction in flame temperature reduces the formation of nitrogen oxides which are temperature-dependent. In the second-stage combustion zone, additional oxygen is injected through the burner block oxygen-discharge ports to complete combustion and optimize flame shape and length.
Illustratively, the burner assembly includes several modular components that can be assembled and changed easily. An oxygen-supply housing can be connected to or disconnected from a burner block using a frame and removable fasteners. A fuel nozzle module is mounted in the oxygen-supply housing so that it can be removed easily. By replacing a gas-fuel nozzle module with an oil-fuel nozzle module, it is possible to convert the burner assembly from a gas-burning unit to an oil-burning unit.
Additional features and advantages of the invention will become apparent to those skilled in the art upon consideration of the following detailed description of preferred embodiments exemplifying the best mode of carrying out the invention as presently perceived.
The detailed description particularly refers to the accompanying figures in which:
As shown in FIG. 1, a staged oxygen burner assembly 10 includes a burner block 12, a frame 14 mounted on an inlet end of the burner block 12, and a hollow oxygen-supply housing 16 mounted on the frame 14 by means of removable fasteners 18. A fuel nozzle 20 is positioned to lie inside the hollow oxygen-supply housing 16 and is retained in place by means of a removable collar 22. It is easy to replace the fuel nozzle 20 because of the modular nature of the staged oxygen burner assembly 10. For example, to convert the staged oxygen burner assembly 10 from a gas-fired unit to an oil-fired unit, it is necessary only to replace the gas-fuel nozzle module shown in FIG. 3A with the oil-fuel nozzle module shown in FIG. 7. Body portion 155 includes a mounting fixture 271 for effectuating a seal with a rear lip portion 75 of the tip 62 of hollow shell 56. Mounting fixture 271 includes an outer end 350 and an opposite inner end 352 facing chamber 56. Threaded portion 232 and limit rib 234 of removable collar 22 cooperate to support burner tip portion 158 in an installed position within the inlet opening 34. Thus, to convert staged oxygen burner assembly 10 from a gas-fired unit to an oil-fired unit, it is necessary only to remove collar 22 from rear lip portion 75 of hollow shell 56, pull nozzle 20 from chamber 56, insert fuel-delivery assembly 152 into passageway so that burner tip portion extends through inlet opening 34, and couple collar 22 to rear lip portion 75 and mounting fixture 271. A central fuel-oil passageway 160, formed in a channel member 162, is provided with an inlet connector for receiving a suitable supply of fuel such as oil.
The burner tip portion 158 forms a chamber 164 between a forward channel portion of the channel member 162 and the inner circumferential wall portion of the burner tip portion 158. An atomizing member 166 is secured to an outlet end of the forward channel portion and projects within the central fuel-oil passageway 160. The forward end of the burner tip portion 158 terminates at its outer end in a burner tip opening.
An atomizing fluid passageway 168 extends through the inlet body portion 155 and central body portion 156 of the fuel assembly 152 exteriorly of channel member 162, and communicates at its outlet end with the chamber 164 formed between the burner tip portion 158 and the channel member 162. The atomizing fluid passage 168 is provided at its inlet end with a connector for receiving a suitable supply of atomizing fluid such as oxygen from atomizing fluid supply 169 coupled to atomizing fluid passage 168 by conduit 171. The centering ring or spider 154 is provided with a plurality of openings or ports for the flow of oxygen outwardly along the outer surface of burner tip portion 158.
An oxygen inlet 60 communicates with the oxygen-supply housing 16 which surrounds the central body portion 156 and the burner tip portion 158 of the fuel-delivery assembly 152. A first portion 37 of the oxygen supplied to the housing 16 exits first aperture 66 formed in base wall 52 through the plurality of oxygen ports or openings formed in the spider or centering ring 154, so as to provide an oxygen envelope about the atomized oil discharged from the outlet end of the fuel assembly 152. A remaining portion 39 of the oxygen supplied to the housing 16 is diverted to flow through second apertures 68 formed in base wall 52 along a different path to reach flame 44 in the manner described above. Such diversion of combustion oxygen flow is an important feature of the staged oxygen-fuel burner assembly and contributes to the lowered nitrogen oxide emissions achieved by the burner assembly 210.
Although the invention has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the scope and spirit of the invention as described and defined in the following claims.
| Patent | Priority | Assignee | Title |
| 10371377, | Sep 05 2013 | Honeywell International Inc. | Pulverized fuel-oxygen burner |
| 7775791, | Feb 25 2008 | General Electric Company | Method and apparatus for staged combustion of air and fuel |
| 7963764, | Aug 23 2004 | GENERAL ELECTRIC TECHNOLOGY GMBH | Hybrid burner lance |
| Patent | Priority | Assignee | Title |
| 1118506, | |||
| 1304402, | |||
| 2368370, | |||
| 2390056, | |||
| 2583736, | |||
| 2952307, | |||
| 2986206, | |||
| 3132683, | |||
| 3168131, | |||
| 3244220, | |||
| 3418062, | |||
| 3514244, | |||
| 3574508, | |||
| 4004875, | Jan 23 1975 | KOCH ENGINEERING COMPANY, INC | Low nox burner |
| 4181491, | Sep 22 1976 | Bloom Engineering Company, Inc. | Method and apparatus for heating a furnace chamber |
| 4230445, | Jun 17 1977 | Sulzer Brothers Ltd. | Burner for a fluid fuel |
| 4351632, | Jul 01 1977 | Chugairo Kogyo Kaisha Ltd. | Burner with suppressed NOx generation |
| 4439137, | Dec 21 1978 | Kobe Steel, Limited | Method and apparatus for combustion with a minimum of NOx emission |
| 4583936, | Jun 24 1983 | Gas Research Institute | Frequency modulated burner system |
| 4690635, | Jul 21 1986 | Maxon Corporation | High temperature burner assembly |
| 4986748, | Dec 15 1989 | Corning Incorporated | Wide range oxy-fuel burner and furnace operation |
| 5092760, | Aug 01 1990 | CORNING INCORPORATED A CORP OF NY | Oxygen-fuel burner assembly and operation |
| 5240410, | Jan 07 1992 | Industrial Technology Research Institute | Dual fuel low nox burner |
| 5263849, | Dec 20 1991 | Hauck Manufacturing Company | High velocity burner, system and method |
| 5269679, | Oct 16 1992 | Gas Technology Institute | Staged air, recirculating flue gas low NOx burner |
| 5431559, | Jul 15 1993 | Maxon Corporation | Oxygen-fuel burner with staged oxygen supply |
| GB1107703, | |||
| JP1167502, | |||
| JP352014227, | |||
| JP352140920, | |||
| JP354054340, | |||
| JP354055825, | |||
| JP354072523, | |||
| JP356082306, | |||
| JP401070606, | |||
| JP5232132, | |||
| JP5592804, | |||
| JP5634006, |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Oct 17 1997 | Maxon Corporation | (assignment on the face of the patent) | / | |||
| Dec 07 2007 | SIGNATURE 7 L P | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0047 | |
| Dec 07 2007 | SIGNATURE 5 L P | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0047 | |
| Dec 07 2007 | HANCOCK MEZZANINE PARTNERS III, L P | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0047 | |
| Dec 07 2007 | JOHN HANCOCK LIFE INSURANCE COMPANY | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0047 | |
| Dec 07 2007 | MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0033 | |
| Dec 07 2007 | MASSMUTUAL CORPORATE INVESTORS | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0033 | |
| Dec 07 2007 | MASSMUTUAL PARTICIPATION INVESTORS | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0033 | |
| Dec 07 2007 | C M LIFE INSURANCE COMPANY | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0033 | |
| Dec 07 2007 | ALLSTATE LIFE INSURANCE COMPANY | Maxon Corporation | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 020218 | /0047 |
| Date | Maintenance Fee Events |
| Apr 17 2007 | M1553: Payment of Maintenance Fee, 12th Year, Large Entity. |
| Apr 23 2007 | ASPN: Payor Number Assigned. |
| Mar 06 2009 | ASPN: Payor Number Assigned. |
| Mar 06 2009 | RMPN: Payer Number De-assigned. |
| Date | Maintenance Schedule |
| Dec 12 2009 | 4 years fee payment window open |
| Jun 12 2010 | 6 months grace period start (w surcharge) |
| Dec 12 2010 | patent expiry (for year 4) |
| Dec 12 2012 | 2 years to revive unintentionally abandoned end. (for year 4) |
| Dec 12 2013 | 8 years fee payment window open |
| Jun 12 2014 | 6 months grace period start (w surcharge) |
| Dec 12 2014 | patent expiry (for year 8) |
| Dec 12 2016 | 2 years to revive unintentionally abandoned end. (for year 8) |
| Dec 12 2017 | 12 years fee payment window open |
| Jun 12 2018 | 6 months grace period start (w surcharge) |
| Dec 12 2018 | patent expiry (for year 12) |
| Dec 12 2020 | 2 years to revive unintentionally abandoned end. (for year 12) |