U.S. patent application number 14/557022 was filed with the patent office on 2015-06-04 for burner.
The applicant listed for this patent is Normand Brais, Eric Duplain, John Viskup. Invention is credited to Normand Brais, Eric Duplain, John Viskup.
Application Number | 20150153065 14/557022 |
Document ID | / |
Family ID | 53265028 |
Filed Date | 2015-06-04 |
United States Patent
Application |
20150153065 |
Kind Code |
A1 |
Brais; Normand ; et
al. |
June 4, 2015 |
BURNER
Abstract
The disclosure is directed toward a burner having a burner
assembly and a large transparent door for viewing various
components of the burner assembly and/or an integral pilot system.
The burner can also include a windbox to manipulate air used by the
burner assembly and/or an air manipulation device to ensure a
proper air flow distribution in the burner assembly. The burner can
also include a fan and a housing having holes disposed therein to
permit fuel to enter various portions of the burner assembly.
Inventors: |
Brais; Normand; (Rosemere,
CA) ; Viskup; John; (Owasso, OK) ; Duplain;
Eric; (Montreal, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Brais; Normand
Viskup; John
Duplain; Eric |
Rosemere
Owasso
Montreal |
OK |
CA
US
CA |
|
|
Family ID: |
53265028 |
Appl. No.: |
14/557022 |
Filed: |
December 1, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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61911827 |
Dec 4, 2013 |
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Current U.S.
Class: |
122/18.4 ;
110/206; 110/234; 110/297; 122/19.2; 431/181 |
Current CPC
Class: |
F23L 5/02 20130101; F23D
14/64 20130101; F23D 14/02 20130101; F24H 9/1836 20130101; F23C
2206/102 20130101; F23M 7/00 20130101; F23D 14/36 20130101; F24H
9/02 20130101; F23C 9/00 20130101; F23D 14/62 20130101 |
International
Class: |
F24H 1/12 20060101
F24H001/12; F23D 14/64 20060101 F23D014/64; F23L 5/02 20060101
F23L005/02; F23C 9/00 20060101 F23C009/00; F24H 9/18 20060101
F24H009/18; F24H 9/02 20060101 F24H009/02 |
Claims
1. A burner, the burner comprising: a burner assembly for
combusting a fuel to provide heat to a heat exchanger; and a large
transparent door disposed in the burner for viewing components of
the burner assembly and providing access to components of the
burner assembly.
2. The burner of claim 1 further comprising a flue gas return
system for directing a portion of flue gas present in the heat
exchanger back to the burner assembly, the flue gas system
comprising: an inlet to the flue gas return system in gaseous
communication with the heat exchanger; an outlet from the flue gas
return system in gaseous communication with the burner assembly;
and a duct disposed between the inlet and outlet.
3. The burner of claim 2 wherein the flue gas return system further
comprises a damper that can be selectively opened and closed to
control the amount and flow rate of flue gas entering the burner
assembly.
4. The burner of claim 1 wherein the large door has a diameter
greater than about 16 inches.
5. The burner of claim 1 wherein the large door has a diameter
greater than about 28 inches.
6. The burner of claim 1 wherein at least 50 percent of the large
door is constructed of a transparent material.
7. The burner of claim 1 further including a fan for forcing air
into the burner assembly, the burner assembly further comprising: a
windbox to manipulate the flow of air exiting the fan; a fuel
injection section for providing fuel into the burner assembly to
mix with the manipulated air exiting the windbox; an integral pilot
system to light and maintain a pilot flame; and a throat section
where primary combustion of the mixture of the air and fuel is
initiated.
8. The burner of claim 8 wherein the integral pilot system is
centrally disposed within the burner assembly and includes a fuel
supply, an igniter and a diffuser to distribute a stabilizing
diffusion flame into the throat section of the burner assembly.
9. The burner of claim 9 wherein the fuel injection section
provides the fuel into the burner assembly to mix with the
manipulated air prior to the fuel and air encountering the
stabilizing diffusion flame extending from the diffuser of the
integral pilot system.
10. The burner of claim 8 wherein the windbox includes an air
distribution device disposed therein to create a uniform air
profile to flow into the fuel injection section.
11. The burner of claim 11 wherein the air distribution device is a
substantially cylindrically shaped tube having a plurality of
openings disposed therein that create baffles that extend along a
length of the cylindrically shaped tube.
12. The burner of claim 12 wherein the openings and the baffles are
substantially triangular shaped and one corner of the opening is
rounded and has a radius of curvature greater than about 1
inch.
13. The burner of claim 12 wherein the air from the fan flows into
the windbox and perpendicular to the length of the air distribution
device.
14. The burner of claim 8 wherein the burner assembly further
includes an air manipulation device centrally disposed in the
burner assembly and downstream from the windbox to ensure a proper
air flow distribution of the fuel and air entering the throat
section.
15. The burner of claim 15 wherein the air manipulation device is a
substantially cylindrically shaped tube having a plurality of
openings disposed therein that create baffles that extend along a
predetermined length of the cylindrically shaped tube.
16. The burner of claim 16 wherein the openings and the baffles of
the air manipulation device are substantially triangular shaped and
one corner of the opening is rounded and has a radius of curvature
greater than about 0.1 inch.
17. The burner of claim 16 wherein the air manipulation device has
a first end connected to a backside of the diffuser and a second
end having the openings disposed therein.
18. The burner of claim 8 wherein the fuel injection section
further includes a housing disposed between the windbox and the
throat section, the housing has a plurality of holes disposed
therein to permit the passage of fuel into the burner assembly.
19. The burner of claim 19 wherein the holes disposed in the
housing vary in size to facilitate the depth at which the fuel is
injected into the fuel injection section to adequately mix the
manipulated air exiting the windbox and the fuel passing through
the holes.
20. A burner, the burner comprising: a burner assembly for
combusting a fuel to provide heat to a heat exchanger; an integral
pilot system to light and maintain a pilot flame is centrally
disposed within the burner assembly, the integral pilot system
includes a fuel supply, an igniter and a diffuser to distribute a
stabilizing diffusion flame into a throat section of the burner
assembly.
21. The burner of claim 21 wherein the fuel injection section
provides the fuel into the burner assembly to mix with the
manipulated air prior to the fuel and air encountering the
stabilizing diffusion flame extending from the diffuser of the
integral pilot system.
22. The burner of claim 21 wherein the burner assembly further
includes an air manipulation device centrally disposed in the
burner assembly and downstream from the windbox to ensure a proper
air flow distribution of the fuel and air entering the throat
section.
23. The burner of claim 23 wherein the air manipulation device is a
substantially cylindrically shaped tube having a plurality of
openings disposed therein that create baffles that extend along a
predetermined length of the cylindrically shaped tube.
24. The burner of claim 24 wherein the openings and the baffles of
the air manipulation device are substantially triangular shaped and
one corner of the opening is rounded and has a radius of curvature
greater than about 0.1 inch.
25. The burner of claim 24 wherein the air manipulation device has
a first end connected to a backside of the diffuser and a second
end having the openings disposed therein.
26. A burner, the burner comprising: a windbox disposed between a
fan and a fuel injection section of a burner assembly to manipulate
the flow of air exiting the fan, the windbox having an air
distribution device disposed therein to create a uniform air
profile to flow into the fuel injection section; and an air
manipulation device centrally disposed in the burner assembly and
downstream from the windbox to ensure a proper air flow
distribution of fuel and air exiting the fuel injection
section.
27. The burner of claim 27 wherein the air distribution device is a
substantially cylindrically shaped tube having a plurality of
openings disposed therein that create baffles that extend along a
length of the cylindrically shaped tube.
28. The burner of claim 28 wherein the openings and the baffles are
substantially triangular shaped and one corner of the opening is
rounded and has a radius of curvature greater than about 1
inch.
29. The burner of claim 28 wherein the air from the fan flows into
the windbox and perpendicular to the length of the air distribution
device.
30. The burner of claim 27 wherein the air manipulation device is a
substantially cylindrically shaped tube having a plurality of
openings disposed therein that create baffles that extend along a
predetermined length of the cylindrically shaped tube.
31. The burner of claim 31 wherein the openings and the baffles of
the air manipulation device are substantially triangular shaped and
one corner of the opening is rounded and has a radius of curvature
greater than about 0.1 inch.
32. The burner of claim 31 wherein the air manipulation device has
a first end connected to a backside of the diffuser and a second
end having the openings disposed therein.
33. A burner, the burner comprising: a fan for forcing air into a
fuel injection section disposed in a burner assembly; a housing
disposed between a fan and a throat section, the housing having a
plurality of holes disposed therein to permit the passage of fuel
into the fuel injection section of the burner assembly.
34. The burner of claim 34 wherein the holes disposed in the
housing vary in size to facilitate the depth at which the fuel is
injected into the fuel injection section to more thoroughly mix the
manipulated air exiting the windbox and the fuel passing through
the holes.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a conversion of U.S. Provisional
Application having U.S. Ser. No. 61/911,827, filed Dec. 4, 2013,
which claims the benefit under 35 U.S.C. 119(e). The disclosure of
which is hereby expressly incorporated herein by reference.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] Not applicable.
SUMMARY OF THE INVENTION
[0003] The present disclosure is directed toward a burner that
includes a burner assembly for combusting a fuel to provide heat to
a heat exchanger and a large transparent door disposed in the
burner for viewing components of the burner assembly and providing
access to components of the burner assembly.
[0004] The present disclosure is also directed toward a burner
having a a burner assembly for combusting a fuel to provide heat to
a heat exchanger and an integral pilot system to light and maintain
a pilot flame. The integral pilot system centrally disposed within
the burner assembly. The integral pilot system includes a fuel
supply, an igniter and a diffuser to distribute a stabilizing
diffusion flame into a throat section of the burner assembly.
[0005] The disclosure is also directed toward a burner that
includes a windbox disposed between a fan and a fuel injection
section of a burner assembly to manipulate the flow of air exiting
the fan. The windbox further including an air distribution device
disposed therein to create a uniform air profile to flow into the
fuel injection section. The burner also includes an air
manipulation device centrally disposed in the burner assembly and
downstream from the windbox to ensure a proper air flow
distribution of fuel and air exiting the fuel injection
section.
[0006] Another portion of this disclosure is directed toward a
burner having a fan for forcing air into a fuel injection section
disposed in a burner assembly. The burner also includes a housing
disposed between a fan and a throat section, the housing having a
plurality of holes disposed therein to permit the passage of fuel
into the fuel injection section of the burner assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is a perspective view of a burner constructed in
accordance with the present disclosure.
[0008] FIG. 2 is a side-elevation view of the burner constructed in
accordance with the present disclosure.
[0009] FIG. 3 is a front-elevation view of the burner constructed
in accordance with the present disclosure.
[0010] FIG. 4 is a perspective view of the burner constructed in
accordance with the present disclosure.
[0011] FIG. 5 is a top plan view of the burner constructed in
accordance with the present disclosure.
[0012] FIG. 6 is a cross-sectional view of a burner assembly
constructed in accordance with the present disclosure.
[0013] FIG. 7 is a perspective view of a flue gas recirculation
system and an air delivery system constructed in accordance with
the present disclosure.
[0014] FIG. 8A is a perspective view of an air manipulation device
constructed in accordance with the present disclosure.
[0015] FIG. 8B is a flat pattern engineering view of the air
manipulation device of FIG. 8A constructed in accordance with the
present disclosure.
[0016] FIG. 9A is a perspective view of an air distribution device
constructed in accordance with the present disclosure.
[0017] FIG. 9B is a flat pattern engineering view of the air
distribution device of FIG. 9A constructed in accordance with the
present disclosure.
DETAILED DESCRIPTION OF THE DISCLOSURE
[0018] The present disclosure is directed to a burner 10 for use
with a heat exchanger, such as a boiler 12 (boiler/burner
components shown in FIGS. 1-3). The present disclosure is also
directed toward a method of applying heat to a heat exchanger using
the burner 10 described herein. In one embodiment, shown in FIGS.
4-5, the burner 10 includes a burner assembly 14 for directing and
supplying a heat source, and a fan 16 for supplying air to and
through the burner assembly 14. The burner 10 can also include a
flue gas return system 18 for directing at least a portion of the
flue gas back to the fan 16. In another embodiment, the portion of
the flue gas can be directed to an air duct 20, which can
process/filter air and mix the air and the flue gas prior to this
mixture entering the fan 16 and the burner assembly 14.
[0019] The burner assembly 14, shown in FIG. 6, includes a windbox
22 and an air distribution device 56 for manipulating the flow of
air that flows through the burner assembly 14, a gas injection
section 24 for manipulating the flow of gas into the burner
assembly 14 to be mixed with the air coming from the windbox 22, a
throat section 26 where primary combustion of the air and gas
mixture occurs, and an integral pilot system 28 centrally disposed
within the burner assembly 14. The integral pilot system 28
maintains a pilot flame, ignites a main premix flame and is a
stabilizing diffusion flame to anchor the main premix flame in the
throat section 26. It should be understood and appreciated that the
term "gas" used herein can be any type of gaseous material capable
of being used to fuel a burner.
[0020] The integral pilot system 28 includes a gas supply 30, an
igniter 32, an air manipulation device 44 (FIGS. 8A and 8B) and a
diffuser 34 for anchoring the main premix flame in the throat
section 26. The igniter 32 extends into the diffuser 34 to ignite
the gas flowing from the gas supply 30 into the diffuser 34. The
diffuser 34 is designed such that the stabilizing diffusion flame
is sufficiently distributed into the throat section 26 to ignite
the air and gas mixture entering the throat section 26 from the
windbox 22 and the gas injection section 24. The use of this pilot
system 28 allows for higher burner turndown ratios. The capacity of
the pilot system 28 can be easily increased by increasing the size
of the pilot gas train size. The capacity of the pilot system 28
can be in a range up to about 20 percent of the capacity of the
burner 10.
[0021] The air manipulation device 44 is a cylindrically-shaped
tube and has a first end 45 and a second end 47. The first end 45
can be attached to a backside portion of the diffuser 34. The air
manipulation device 44 is designed to ensure a proper air flow
distribution in the throat section 26 by allowing a gradual
transfer of air to this section over the length of openings 46
disposed in the second end 47 of the air manipulation device 44.
The openings 46 cooperate to create a plurality of baffles 48. In
one embodiment, the openings 46 are triangular shaped. In one
embodiment, the length of the triangular shaped openings 46 is in a
range of from about 6 inches to about 12 inches. In another
embodiment, the length of the triangular shaped openings 46 is in a
range of from about 20 percent of the length of the air
manipulation device 44 to about 50 percent of the length of the air
manipulation device 44.
[0022] In another embodiment, shown in FIG. 7, the flue gas return
system 18 includes an inlet 36 in gaseous communication with the
boiler 12 for receiving flue gas from the boiler 12, an outlet 38
in gaseous communication with the air duct 20, a duct 40 disposed
between the inlet 36 and the outlet 38, and a damper 42 for
controlling the flow of flue gas into the air duct 20.
[0023] The windbox 22 includes an air distribution device 56 (FIGS.
9A and 9B) disposed therein for creating a uniform air profile for
flowing through the gas injection section 24. The air distribution
device 56 is a cylindrically-shaped tube and includes a plurality
of openings 58 that cooperate to create a plurality of baffles 60
that the air from the fan 16 flows through and around prior to
entering the gas injection section 24. In this embodiment, the air
is forced in a direction that is perpendicular to the length of the
air manipulation device 56. Thus, the air manipulation device 56 is
disposed in the windbox 22 such that the air from the fan 16 flows
across it perpendicularly. In yet another embodiment, the air
distribution device 56 can include a second set of baffles 62
attached to and extending outward from the baffles 60. Each of the
baffles 62 can have a length and width that varies in a range of
from about 30 percent of the length of the windbox 22 in the axis
of the air manipulation device 56 to about 100 percent of the
length of the windbox 22 in the axis of the air manipulation device
56.
[0024] In a further embodiment of the present disclosure, the
openings 58 are triangular shaped wherein one of the corners of the
triangular shaped openings 58 is a rounded corner 59. In a further
embodiment of the present disclosure, the radius of curvature of
the rounded corner 59 is greater than about 1 inch.
[0025] The gas injection section 24 includes a housing 50 having a
plurality of holes 52 disposed therein for the injection of gas
into the burner assembly 14. The holes 52 can be varied in size
(diameter), shape, location, and number to create a better mixture
of the gas and air that is premixed prior to entering the throat
section 26. For example, some of the holes 52 can have a larger
diameter to allow for a deeper injection of gas into the air cross
flow in the gas injection section 24.
[0026] Moreover, some of the holes 52 can have a smaller diameter
to force a shallow injection of gas into the air cross flow in the
gas injection section 24. Changing the size, shape, location and
number of holes 52 disposed in the housing 50 permits more control
of the amount of premix of the gas and air prior to encountering
the premix flame. The mixing of the gas and air is done upstream of
the mixture contacting the main premix flame and combusting in the
throat section 26.
[0027] In one embodiment, the larger holes 52 can have a diameter
in a range of from about 3/16 inch to about 1/2 inch. The smaller
holes 52 can have a diameter in a range of from about 1/16 inch to
about 1/4 inch. In yet another embodiment, the housing 50 can
include medium sized holes 52 to facilitate the injection of
fuel/gas into the gas injection section 24 a distance greater than
the smaller holes 52 and less than the larger holes 52. The medium
sized holes 52 can have a diameter in a range of from about 1/8
inch to about 3/8 inch.
[0028] In another embodiment, the smaller holes 52 have diameters
that are in a range of 30 percent to about 50 percent of the
diameters of the larger holes 52. Similarly, the medium sized holes
52 have diameters that are in a range of 60 percent to about 75
percent of the diameters of the larger holes 52. Similarly, the
smaller holes 52 have diameters that are in a range of 50 percent
to about 70 percent of the diameters of the medium sized holes
52.
[0029] The centrally-disposed pilot system 28, and the more
homogenous premix, permits the burner 10 to have ultra-low NOx
emissions (less than 10 ppm) while maintaining a stable combustion
of the air and gas mixture starting in the throat section 26.
[0030] In a further embodiment of the present disclosure, the
burner 10 includes a large door 54 hingedly attached to a portion
of the burner 10. The door 54 can be constructed of a transparent
material, such as double pane glass, to allow visual inspection of
various internal parts of the burner assembly 14 and the fan 16. In
one embodiment, the transparent material makes up at least 50
percent of the area of the door 54. In another embodiment, the
transparent material makes up at least 80 percent of the area of
the door 54.
[0031] In one embodiment, the door 54 is sized such that access to
the burner assembly 14 is permitted to an individual and/or allows
various components of the burner assembly 14 to be removed via the
door 54. In one embodiment, the door 54 has a diameter in a range
greater than about 16 inches. In another embodiment, the door 54
has a diameter in a range of greater than about 28 inches.
[0032] In one embodiment, the door 54 can be located on the windbox
22. This permits access to burner components almost immediately
after the burner is shut off because the design of the burner 10 is
such that a number of burner components are cooled quickly by the
fan 16. The door 54 made of see-through glass eases the diagnostic
process of the burner 10 when problems arise.
[0033] The present disclosure is also directed to a method of using
the burner 10 described herein. The method includes the step of
forcing air into and through the burner assembly 14 via any manner
known in the art, such as the fan 16 described herein. The method
can also include mixing the air forced into the burner assembly 14
with a fuel, or gas, to create a combustion mixture. The combustion
mixture can then be combusted to create heat to be provided to the
boiler 12 (or heat exchanger). In a further embodiment, the method
includes the step of mixing the air forced into the burner assembly
14 with a portion of flue gas removed from the boiler 12 via the
flue gas return system 18.
[0034] From the above description, it is clear that the present
disclosure is well adapted to carry out the objectives and to
attain the advantages mentioned herein as well as those inherent in
the disclosure. While embodiments have been described for purposes
of this disclosure, it will be understood that numerous changes may
be made which will readily suggest themselves to those skilled in
the art and which are accomplished within the spirit of the
disclosure.
* * * * *