U.S. patent application number 14/400883 was filed with the patent office on 2016-09-15 for a forced reversal combustion chamber.
The applicant listed for this patent is Yanxin LI. Invention is credited to Yanxin LI.
Application Number | 20160265766 14/400883 |
Document ID | / |
Family ID | 50859595 |
Filed Date | 2016-09-15 |
United States Patent
Application |
20160265766 |
Kind Code |
A1 |
LI; Yanxin |
September 15, 2016 |
A FORCED REVERSAL COMBUSTION CHAMBER
Abstract
Burners, such as all kinds of fuel oil, gas and powdered coal,
have combustion chambers for stabilizing combustion and air
distribution. The invention discloses a forced reversal combustion
chamber, which has a combustion chamber body, configured as a
hollow cavity a plurality of swirl vanes for delivering combustion
air into the combustion chamber, correspondingly provided on
interior side of flame outlet end of the combustion chamber; in the
middle of inner end of the combustion chamber, a fuel nozzle is
provided, which inserts into interior wall of the combustion
chamber and outlet of which extends through the interior wall of
the combustion chamber; outlet end of the combustion chamber after
mixing air and fuel is flame outlet. The forced reversal combustion
chamber of the invention can provide good flame stabilization, high
burn-off rate of fuel and good environmental protection
property.
Inventors: |
LI; Yanxin; (Beijing,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LI; Yanxin |
Beijing |
|
CN |
|
|
Family ID: |
50859595 |
Appl. No.: |
14/400883 |
Filed: |
April 4, 2014 |
PCT Filed: |
April 4, 2014 |
PCT NO: |
PCT/CN2014/000371 |
371 Date: |
November 13, 2014 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F23C 7/004 20130101;
F23C 7/02 20130101; F23D 11/40 20130101; F23C 2900/03006 20130101;
F23D 14/24 20130101; F23C 3/00 20130101 |
International
Class: |
F23D 14/24 20060101
F23D014/24; F23D 11/40 20060101 F23D011/40; F23C 3/00 20060101
F23C003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 28, 2014 |
CN |
201410121259.1 |
Claims
1-4. (canceled)
5. A forced reversal combustion chamber, the combustion chamber
comprising: a combustion chamber body formed as a hollow cavity
which is similar to an arcing shape formed by folding fingers
towards a palm and symmetrically configured around a center of the
palm; and a plurality of swirl vanes that deliver combustion air
into the combustion chamber, correspondingly provided on an
interior side of a flame outlet end of the combustion chamber; said
plurality of swirl vanes comprising a plurality of secondary air
swirl vanes for delivering radial secondary air into the combustion
chamber, provided on the interior side of the flame outlet end of
the combustion chamber.
6. A forced reversal combustion chamber in accordance with claim 5,
wherein in a middle of the inner end of the combustion chamber, a
fuel nozzle is provided, the fuel nozzle inserts into the interior
wall of the combustion chamber and an outlet of the fuel nozzle
extends through the interior wall of the combustion chamber; and an
outlet end of the combustion chamber that is a flame outlet, after
mixing air and fuel.
7. A forced reversal combustion chamber in accordance with claim 6,
wherein said plurality of swirl vanes comprises a plurality of
tertiary air swirl vanes that deliver tangential tertiary air to
the flame, the tertiary air swirl vanes provided on the interior
side of the flame outlet of the combustion chamber.
8. A forced reversal combustion chamber in accordance with claim 5,
wherein an air delivery channel is provided on the side of the
hollow arcing cavity of the combustion chamber away from the flame;
an air blower for delivering combustion air into the combustion
chamber is provided inside the air delivery channel, an air outlet
of which is disposed on an opposite cavity wall of the hollow
arcing cavity of the combustion chamber.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to technical field of burners,
in particular, relates to a forced reversal combustion chamber.
BACKGROUND OF THE INVENTION
[0002] Combustion chambers of conventional burners for fuel oil,
gas and powdered coal all have forward air distribution (moving
direction of air is same with that of the flame); as shown in FIG.
1, when secondary air flowing through outer side of swirl vanes
(also known as, flame plates, or diffusion vanes) at high speed,
partial negative pressure area is formed in front of flame plates
that flame is passively reversed and igniting continually ejected
fuel. For achieving effect of flame stabilization, the method
usually has about 20% of primary air that 80% remainder air of
secondary air mixes with fuel at outlet of the combustion chamber
and fiercely blazes.
[0003] Conventional burners, as shown in FIG. 1, comprises
combustion chamber (e.g. combustion chamber 3), wherein side wall
of the combustion chamber is arcing structure projecting outward,
one end of the combustion chamber is flame outlet for emitting
flame, a fuel nozzle (e.g. fuel nozzle 2) is provided opposite the
flame outlet on center of inner end of the combustion chamber, a
pair of swirl vanes (e.g. swirl vanes 5) are disposed at opposite
sides of the fuel nozzle inside the combustion chamber, a
horizontally set air delivery channel is disposed on the other end
of the combustion chamber, an air blower (e.g. air blower 1) for
delivering secondary air (e.g. secondary air 4) into the combustion
chamber is provided inside the air delivery channel, air outlet of
which is opposite periphery of fuel nozzle.
[0004] The defects of this forward air distribution are:
[0005] (1) For small combustion chamber or nonflammable fuel with
higher ignition point, since passively reversal of flame is weak
because of the partial negative pressure, and temperatures of both
initial phases of air and fuel are low, it is usually hard to
ignite and easily blowing-off that leads to instability of
burning;
[0006] (2) Since primary air has small air quantity and slow flow
speed, burning of the fuel mainly happens outside the combustion
chamber; when fuel is high viscosity oil or other nonflammable
fuel, burn-off rate would obviously decline that leads to huge
increase of energy consumption and emission pollution;
[0007] (3) For big combustion chamber or flammable fuel, since
temperature inside the combustion chamber is high and temperature
of secondary air is already very high before mixing with fuel,
which leads to partial of oxygen reacting with nitrogen, it
increases emission of nitric oxide.
SUMMARY OF THE INVENTION
[0008] Regarding to above problems, the object of the invention is
to provide a forced reversal combustion chamber, to achieve
advantages of good flame stabilization, high burn-off rate of fuel
and good environmental protection property.
[0009] To achieve above object, technical solution of the invention
is: a forced reversal combustion chamber comprises a combustion
chamber body, configured as a hollow cavity which is similar to a
arcing shape formed by folding fingers towards palm and
symmetrically configured around center of palm; and a plurality of
swirl vanes for delivering combustion air into the combustion
chamber, correspondingly provided on interior side of the end of
the combustion chamber; said plurality of swirl vanes comprises a
plurality of secondary air swirl vanes (or air vents) for radially
delivering secondary air into the combustion chamber, provided on
interior side of flame outlet of the combustion chamber.
[0010] Furthermore, said plurality of swirl vanes comprises a
plurality of tertiary air swirl vanes for delivering tertiary air
to the combustion chamber, provided on interior side of the end of
the combustion chamber.
[0011] Furthermore, a fuel nozzle is provided in the middle of the
combustion chamber, which inserts into interior wall of the
combustion chamber and outlet of which extends through interior
wall of the combustion chamber; outlet end after mixing the air and
fuel is flame outlet of combustion chamber.
[0012] Furthermore, an air delivery channel is provided on the side
of the hollow arcing cavity of the combustion chamber away from the
flame outlet; an air blower for delivering combustion air into
combustion chamber is provided inside said air delivery channel,
air outlet of which is opposite cavity wall of hollow arcing cavity
of the combustion chamber.
[0013] Forced reversal combustion chamber in embodiments of the
invention comprises a combustion chamber body, configured as a
hollow cavity which is similar to a arcing shape formed by folding
fingers towards palm and symmetrically configured around center of
palm; a plurality of swirl vanes for delivering secondary air into
the combustion chamber, correspondingly provided on interior side
of the end of the combustion chamber; a fuel nozzle is provided in
the middle of the combustion chamber, which inserts into interior
wall of the combustion chamber and outlet of which extends through
interior wall of the combustion chamber; outlet end after mixing
the air and fuel is flame outlet of the combustion chamber. Since
air distribution of secondary air forced reversal is used, flame
and high temperature air could be forced to flow to fuel nozzle to
quickly ignite the fuel, which overcomes disadvantages of bad flame
stabilization, low burn-off rate of fuel and poor environmental
protection property in the prior art and achieves advantages of
good flame stabilization, high burn-off rate of fuel and good
environmental protection property.
[0014] Other features and advantages of the invention will be
illustrated in following description, and partially be obvious from
the description or understood by carrying out the invention.
[0015] There will be described embodiments of this invention, with
reference to the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Drawings are used for further understanding of the
invention, which is also a part of the description for explanation
of the invention, with reference to embodiments of the invention,
but not for limitation. In the drawings:
[0017] FIG. 1 is working schematic diagram of forward air
distribution of a conventional combustion chamber;
[0018] FIG. 2 is working schematic diagram of air distribution of
forced reversal combustion chamber of the invention.
[0019] Figure references of embodiments of the invention, with
reference of FIG.
[0020] 1, are as follow:
[0021] 1--air blower; 2--fuel nozzle; 3--combustion chamber;
4--secondary air; 5--swirl vanes; 6--flame.
[0022] Figure references of embodiments of the invention, with
reference of FIG. 2, are as follow:
[0023] 1--air blower; 2--fuel nozzle; 3--combustion chamber;
4--secondary air swirl vanes; 5--tertiary air swirl vanes;
6--flame.
DETAILED DESCRIPTION OF THE INVENTION
[0024] Preferred embodiments of the invention are further explained
as follow; it should be understood that description herein of
preferred embodiments is only used for explanation and illustration
of the invention, not for limitation of the invention.
[0025] According to embodiment of the invention, as shown in FIG.
2, it provides a forced reversal combustion chamber.
[0026] Forced reversal combustion chamber of the embodiment
comprises a combustion chamber body (e.g. combustion chamber 3),
configured as a hollow cavity which is similar to a arcing shape
formed by folding fingers towards palm and symmetrically configured
around center of palm; a plurality of swirl vanes for delivering
combustion air into the combustion chamber, correspondingly
provided on interior side of the end of the combustion chamber,
which comprise a plurality of secondary air swirl vanes (e.g.
secondary air swirl vanes 4) for delivering secondary air into the
combustion chamber provided on interior side of flame outlet of the
combustion chamber, and comprise a plurality of tertiary air swirl
vanes (e.g. tertiary air swirl vanes 5) for delivering tertiary air
into the combustion chamber, provided on interior side of flame
outlet of the combustion chamber; a fuel nozzle (e.g. fuel nozzle
2) is provided in the middle of the combustion chamber, which
inserts into interior wall of the combustion chamber and outlet of
which extends through interior wall of the combustion chamber;
common outlet end of combustion chamber fuel nozzle is flame (e.g.
flame 6) outlet.
[0027] In foresaid embodiment, an air delivery channel is provided
on the side of the hollow arcing cavity of the combustion chamber
away from the flame; an air blower (e.g. air blower 1) for
delivering combustion air into the combustion chamber is provided
inside the air delivery channel, air outlet of which is opposite
cavity wall of hollow arcing cavity of the combustion chamber.
[0028] As shown in FIG. 2, the forced reversal combustion chamber
of foresaid embodiment uses air distribution of secondary air
forced reversal, cancels primary air swirl vanes in the back of
conventional combustion chamber, and adds swirl vanes of secondary
air and tertiary air on forepart of the combustion chamber. When
using the forced reversal combustion chamber for air distribution,
proportion of primary air for providing oxygen in flame center in
the center is very small; proportion of radial forced reversal
secondary air is bigger, it turns back when reaching inner end of
the combustion chamber to form inner spin flow that flows to flame
outlet; remainder air tangentially rotatably emits when flowing
through tertiary air swirl vanes, and sufficiently mixes with the
inner spin flow to ensure burning out of the fuel. The air
distribution of the forced reversal combustion chamber could at
least achieve following beneficial effects:
[0029] (1) Backwards outer spinning reversal secondary air,
wrapping outer flame of the flame, flows to fuel nozzle; since
temperature of the flow is high, it could effectively ignite
continually emitted high ignition point fuel or nonflammable fuel,
and form inner spin flame which turns back at outlet of the
combustion chamber so that flame stabilization effect of
nonflammable fuel would be great;
[0030] (2) Air quantity of secondary air is big, its angular
kinetic energy could rapidly break fuel flow and mix with it; since
fuel emits in a high temperature and oxygen-enriched environment,
it blazes immediately, which is very important for burn-off rate of
high viscosity or nonflammable fuel;
[0031] (3) Air temperature of outlet of secondary air swirl vanes
is low; secondary air is continuously heated when flowing to fuel
nozzle, while temperature of inner spin flame is declined that is
good for reducing generation of high-temperature nitric oxide;
[0032] (4) Coefficient of excess air in combustion chamber is
controlled at about 0.7 to 0.8; oxygen-deficient environment is
good for reduction of fuel type nitric oxide and for reducing
generation of high-temperature nitric oxide;
[0033] (5) Tertiary air swirl vanes is configured at outlet of
combustion chamber, adding low temperature tertiary air not only
ensures burn-off rate of fuel, but also lowers flame temperature
and reduces generation of high-temperature nitric oxide.
[0034] There have been described a preferred embodiment of this
invention, of which the contents of disclosure should be construed
illustrative, not restrictive to the invention. Artisan may
perceive a modification to technical solution of foresaid
embodiments, or an equal substitution to partial technical features
therein. Without departing from the spirit and scope of the
invention, any modification, equal substitution, and improvement
shall be comprised in protection scope of the invention.
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