U.S. patent application number 14/654681 was filed with the patent office on 2015-12-03 for combustion burner and pressurized gasification furnace.
This patent application is currently assigned to MITSUBISHI HEAVY INDUSTRIES, LTD.. The applicant listed for this patent is MITSUBISHI HEAVY INDUSTRIES, LTD.. Invention is credited to Shinya HAMASAKI, Keisuke MATSUO, Yasuyuki MIYATA, Yasuo SODA, Katsuhiko YOKOHAMA.
Application Number | 20150345788 14/654681 |
Document ID | / |
Family ID | 51020701 |
Filed Date | 2015-12-03 |
United States Patent
Application |
20150345788 |
Kind Code |
A1 |
MIYATA; Yasuyuki ; et
al. |
December 3, 2015 |
COMBUSTION BURNER AND PRESSURIZED GASIFICATION FURNACE
Abstract
A combustion burner and a pressurized gasification furnace
provided with: a burner main body (41) capable of blowing a fuel
gas in which fuel and air are mixed; and an ignition torch (42)
that is provided inside the burner main body (41) and propagates a
flame from the base end part of the torch, with the flame being
discharged from the tip end part. By arranging the tip end part
(42a) of the ignition torch (42) at the base-end side with respect
to the tip end part (41a) of the burner main body (41), the thermal
load at the tip end part of the ignition torch during ignition is
reduced, and thus the durability can be improved.
Inventors: |
MIYATA; Yasuyuki; (Tokyo,
JP) ; SODA; Yasuo; (Tokyo, JP) ; YOKOHAMA;
Katsuhiko; (Tokyo, JP) ; HAMASAKI; Shinya;
(Tokyo, JP) ; MATSUO; Keisuke; (Tokyo,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MITSUBISHI HEAVY INDUSTRIES, LTD. |
Minato-ku, Tokyo |
|
JP |
|
|
Assignee: |
MITSUBISHI HEAVY INDUSTRIES,
LTD.
Minato-ku, Tokyo
JP
|
Family ID: |
51020701 |
Appl. No.: |
14/654681 |
Filed: |
November 28, 2013 |
PCT Filed: |
November 28, 2013 |
PCT NO: |
PCT/JP2013/082067 |
371 Date: |
June 22, 2015 |
Current U.S.
Class: |
431/281 ;
431/353 |
Current CPC
Class: |
C10J 2300/0989 20130101;
F23Q 9/00 20130101; F23D 14/70 20130101; F23C 5/32 20130101; F23D
2207/00 20130101; C10J 3/487 20130101; F23D 14/02 20130101; C10J
2200/152 20130101; C10J 2300/093 20130101; C10J 3/726 20130101 |
International
Class: |
F23Q 9/00 20060101
F23Q009/00; F23D 14/02 20060101 F23D014/02 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 26, 2012 |
JP |
2012-283246 |
Claims
1. A combustion burner comprising: a burner main body which is able
to blow fuel gas which is a mixture of fuel and air; and an
ignition torch which is disposed inside the burner main body and
allows a flame to propagate from a base end portion of the ignition
torch so as to be sent out from a tip end portion of the ignition
torch, wherein the tip end portion of the ignition torch is
disposed on the base end portion side with respect to a tip end
portion of the burner main body.
2. The combustion burner according to claim 1, wherein, during a
non-operation of the ignition torch, the tip end portion of the
ignition torch is disposed closer to the base end portion side than
the tip end portion of the burner main body.
3. The combustion burner according to claim 2, wherein a time of
the non-operation of the ignition torch includes a time before
allowing the flame to propagate from the base end portion of the
ignition torch to the tip end portion or a time after stopping the
propagation of the flame by the ignition torch after an ignition of
the fuel gas from the burner main body.
4. The combustion burner according to claim 1, wherein, during an
operation of the ignition torch, the tip end portion of the
ignition torch is disposed at substantially the same position as
that of the tip end portion of the burner main body.
5. The combustion burner according to claim 4, wherein a time of
the operation of the ignition torch includes a time when the flame
is allowed to propagate from the base end portion of the ignition
torch to the tip end portion.
6. The combustion burner according to claim 1, wherein the position
of the tip end portion during the non-operation of the ignition
torch is set in consideration of a length of a pipe through which
the flame propagates.
7. The combustion burner according to claim 1, wherein an ignition
unit is provided in the base end portion of the ignition torch, and
an on-off valve is provided on a downstream side in a fuel flow
direction of the ignition unit.
8. A pressurized gasification furnace comprising: a burner main
body which is fixed to a furnace wall and is able to blow fuel gas
which is a mixture of fuel and air into a furnace; and an ignition
torch which is fixed to the furnace wall to be disposed inside the
burner main body and allows a flame to propagate from a base end
portion of the ignition torch so as to be sent out from a tip end
portion of the ignition torch, wherein the tip end portion of the
ignition torch is disposed on the base end portion side with
respect to a tip end portion of the burner main body.
Description
TECHNICAL FIELD
[0001] The present invention relates to a combustion burner which
is used in a furnace such as a pressurized gasification furnace,
and a pressurized gasification furnace including the combustion
burner.
BACKGROUND ART
[0002] For example, in a gasification furnace such as a coal
gasification furnace, a start-up burner is provided with an
ignition torch in the vicinity thereof to ignite the start-up
burner.
[0003] As the ignition torch of the related art, for example, an
ignition torch is described in PTL 1 as follows. The ignition torch
of PTL 1 is configured to extend across the inside of a
gasification furnace from the outside thereof so as to allow fuel
and combustion air to be received from one end of the gasification
furnace and allow a flame to be sent out from the other end of the
gasification furnace, and an ignition unit is provided on one end
side which is positioned outside the gasification furnace.
CITATION LIST
Patent Literature
[0004] [PTL 1] Japanese Unexamined Patent Application Publication
No. 2011-117713
SUMMARY OF INVENTION
Technical Problem
[0005] In the ignition torch of the related art described above,
the ignition unit is provided on the base end portion side which is
positioned outside the gasification furnace. Therefore, when the
start-up burner is ignited by using the ignition torch, the flame
formed by the ignition unit propagates toward the tip end portion
through the inside of a pipe and ignites fuel gas which is
discharged from the tip end portion of the start-up burner. At this
time, since the pipe of the ignition torch has a predetermined
length, thermal elongation occurs during the propagation of the
flame. In this case, the tip end portion of the ignition torch
protrudes forward from the tip end portion of the start-up burner
and thus is likely to receive a thermal load during the ignition. A
flame stabilization unit is formed in the tip end portion of the
ignition torch, and thus there is concern that the flame
stabilization unit may be burned out by a thermal load during the
ignition.
[0006] In order to solve the above-described problems, an object of
the present invention is to provide a combustion burner and a
pressurized gasification furnace capable of enhancing durability by
reducing a thermal load on a tip end portion of an ignition
torch.
Solution to Problem
[0007] In order to accomplish the object, a combustion burner of
the present invention includes: a burner main body which is able to
blow fuel gas which is a mixture of fuel and air; and an ignition
torch which is disposed inside the burner main body and allows a
flame to propagate from a base end portion of the ignition torch so
as to be sent out from a tip end portion of the ignition torch, in
which the tip end portion of the ignition torch is disposed on the
base end portion side with respect to a tip end portion of the
burner main body.
[0008] Accordingly, when the fuel gas which is blown from the
burner main body is ignited and forms a flame, the tip end portion
of the ignition torch is disposed on the base end portion side with
respect to the tip end portion of the burner main body. Therefore,
a thermal load on the tip end portion of the ignition torch due to
the flame of the burner main body can be reduced, and thus
durability can be enhanced and the life span can be extended.
[0009] In the combustion burner of the present invention, during a
non-operation of the ignition torch, the tip end portion of the
ignition torch is disposed closer to the base end portion side than
the tip end portion of the burner main body.
[0010] Accordingly, the tip end portion is positioned at a retreat
position during the non-operation of the ignition torch, and thus a
thermal load on the tip end portion of the ignition torch due to
the flame of the burner main body can be reduced.
[0011] In the combustion burner of the present invention, a time of
the non-operation of the ignition torch includes a time before
allowing the flame to propagate from the base end portion of the
ignition torch to the tip end portion or a time after stopping the
propagation of the flame by the ignition torch after an ignition of
the fuel gas from the burner main body.
[0012] Accordingly, the tip end portion of the ignition torch is
positioned at the retreat position before allowing a flame to
propagate from the base end portion of the ignition torch to the
tip end portion or after stopping the propagation of the flame by
the ignition torch after the ignition of the fuel gas from the
burner main body, and thus a thermal load on the tip end portion of
the ignition torch due to the flame of the burner main body can be
reduced.
[0013] In the combustion burner of the present invention, during an
operation of the ignition torch, the tip end portion of the
ignition torch is disposed at substantially the same position as
that of the tip end portion of the burner main body.
[0014] Accordingly, the tip end portion of the ignition torch is
positioned at substantially the same position as that of the tip
end portion of the burner main body during the operation.
Therefore, at this time, the ignition torch can appropriately
ignite the fuel gas which is blown from the burner main body by the
flame which propagates from the base end portion and is sent out
from the tip end portion.
[0015] In the combustion burner of the present invention, a time of
the operation of the ignition torch includes a time when the flame
is allowed to propagate from the base end portion of the ignition
torch to the tip end portion.
[0016] Accordingly, when the flame propagates from the base end
portion of the ignition torch to the tip end portion, the tip end
portion of the ignition torch is positioned at substantially the
same position as that of the tip end portion of the burner main
body, and thus the fuel gas which is blown from the burner main
body can be appropriately ignited by the ignition torch.
[0017] In the combustion burner of the present invention, the
position of the tip end portion during the non-operation of the
ignition torch is set in consideration of a length of a pipe
through which the flame propagates.
[0018] Accordingly, the position during the operation and the
position during the non-operation in the ignition torch can be
appropriately set.
[0019] In the combustion burner of the present invention, an
ignition unit is provided in the base end portion of the ignition
torch, and an on-off valve is provided on a downstream side in a
fuel flow direction of the ignition unit.
[0020] Accordingly, since the ignition unit is provided in the base
end portion of the ignition torch, regardless of the state of the
tip end portion side, the inspection of the ignition unit can be
easily performed. In addition, since the on-off valve is provided
on the downstream side in the fuel flow direction of the ignition
unit, the base end portion side and the tip end portion side can be
separated from each other by closing the on-off valve. Therefore,
even in a case where inspection is required, the ignition unit side
can be separated from the flame by closing the on-off valve, and
thus the inspection can be easily performed.
[0021] A pressurized gasification furnace of the present invention
includes: a burner main body which is fixed to a furnace wall and
is able to blow fuel gas which is a mixture of fuel and air into a
furnace; and an ignition torch which is fixed to the furnace wall
to be disposed inside the burner main body and allows a flame to
propagate from a base end portion of the ignition torch so as to be
sent out from a tip end portion of the ignition torch, in which the
tip end portion of the ignition torch is disposed on the base end
portion side with respect to a tip end portion of the burner main
body.
[0022] Accordingly, the tip end portion of the ignition torch is
disposed on the base end portion side with respect to the tip end
portion of the burner main body when the fuel gas which is blown
from the burner main body is ignited and forms a flame. Therefore,
a thermal load on the tip end portion of the ignition torch due to
the flame of the burner main body can be reduced, and thus
durability can be enhanced and the life span can be extended.
Advantageous Effects of Invention
[0023] According to the combustion burner and the pressurized
gasification furnace of the present invention, since the tip end
portion of the ignition torch is disposed on the base end portion
side with respect to the tip end portion of the burner main body, a
thermal load on the tip end portion of the ignition torch due to
the flame of the burner main body can be reduced, and thus
durability can be enhanced and the life span can be extended.
BRIEF DESCRIPTION OF DRAWINGS
[0024] FIG. 1 is a schematic view illustrating a combustion burner
according to an embodiment of the present invention.
[0025] FIG. 2 is a schematic view illustrating an action of the
combustion burner of the embodiment.
[0026] FIG. 3 is a longitudinal sectional view of a coal
gasification furnace container of the embodiment.
[0027] FIG. 4 is a cross-sectional view taken along line A-A of
FIG. 3, illustrating a transverse sectional view of the coal
gasification furnace container of the embodiment.
DESCRIPTION OF EMBODIMENTS
[0028] Hereinafter, an exemplary embodiment of a combustion burner
according to the present invention will be described with reference
to the accompanying drawings. In addition, the present invention is
not limited by the embodiment, and in a case where there are a
plurality of embodiments, a configuration obtained by combining the
embodiments is also included in the present invention.
Embodiment
[0029] FIG. 1 is a schematic view illustrating a combustion burner
according to an embodiment of the present invention, FIG. 2 is a
schematic view illustrating an action of the combustion burner of
the embodiment, FIG. 3 is a longitudinal sectional view of a coal
gasification furnace container of the embodiment, and FIG. 4 is a
cross-sectional view taken along line A-A of FIG. 3, illustrating a
transverse sectional view of the coal gasification furnace
container of the embodiment.
[0030] In the embodiment, as illustrated in FIGS. 3 and 4, a
gasification furnace (pressurized gasification furnace) 1 includes
a light oil combustion chamber 3, a combustor section 5, and a
reductor section 7 in this order from the bottom. The light oil
combustion chamber 3 is provided with start-up burners (combustion
burners) 12. Although described later, the start-up burner 12 is
configured such that an ignition torch 42 is disposed inside a
burner main body 41.
[0031] The combustor section 5 is provided with pulverized coal
burners 14 and char burners 16. The reductor section 7 is provided
with gasification burners 18. In the light oil combustion chamber
3, light oil which is injected and sprayed by the start-up burners
12 is burned, and the generated combustion gas heats the combustor
section 5 on the upper side. In addition, in the combustor section
5 which reaches a coal ignition temperature or higher, coal is
burned with air which is a gasification agent that is only injected
into the combustor section 5 and reaches a high temperature such
that ash in the coal is melted and flows downward and
high-temperature gas generated by the combustion in the combustor
section 5 moves upward. In the reductor section 7, the
high-temperature gas which moves upward from the combustor section
5 and coal which is newly injected react with each other, and thus
the coal can be converted into gas with good efficiency.
[0032] In the embodiment, a plurality of start-up burners are
arranged to oppose each other so as to form a swirling flow in the
gasification furnace 1. As illustrated in FIG. 1, the start-up
burner 12 is configured to include the burner main body 41 and the
ignition torch 42. The burner main body 41 can blow fuel gas which
is a mixture of fuel and air. The ignition torch 42 is disposed
inside the burner main body 41 and allows a flame to propagate from
the base end portion so as to be sent out from the tip end portion.
In addition, the burner main body 41 is ignited by the flame of the
ignition torch 42 and can form a flame as the start-up burner
12.
[0033] The burner main body 41 is provided with a fuel gas passage
53 which is formed between an outer cylinder 51 and an inner
cylinder 52, and a nozzle 54 which is formed at the tip end portion
and can blow the fuel gas into the gasification furnace 1. The
outer cylinder 51 and the inner cylinder 52 have cylindrical shapes
and are fixed to a furnace wall 1a, and the base end portions
thereof are provided with a fuel gas supply portion and a
combustion air supply portion (not illustrated).
[0034] The ignition torch 42 is disposed inside the burner main
body 41, has a cylindrical shape, and is fixed to the furnace wall
1a. The ignition torch 42 is provided with a mixing chamber 20 in
which fuel and combustion air are mixed with each other, an
ignition unit 22, an on-off valve 24, a combustion pipe 26, and a
flame stabilization unit 28 as main components in this order from
the base end portion outside the gasification furnace 1.
[0035] The mixing chamber 20 is provided with a fuel supply port 30
and a combustion air supply port 31. Therefore, the fuel and the
combustion air are sufficiently mixed with each other in the mixing
chamber 20, and the mixture is ignited by the ignition unit 22
which is provided on the downstream side of the fuel flow. As the
ignition unit 22, ignition by a glow plug, an igniter, or the like
is appropriately used.
[0036] The mixing chamber 20 and the ignition unit 22 are disposed
outside the gasification furnace 1. In addition, the on-off valve
24 is provided between the mixing chamber and the combustion pipe
26 which extends across the inside of the gasification furnace 1.
The on-off valve 24 is provided outside the gasification furnace 1.
The on-off valve 24 can allow a fluid between the ignition unit 22
side and the gasification furnace 1 side to flow or to be blocked
by opening or closing the passage. The flame stabilization unit 28
which has a greater inner diameter than that of the combustion pipe
26 is provided in the tip end portion of the combustion pipe 26,
and a flame stabilization plate 28a is fixed to the inside of the
flame stabilization unit 28.
[0037] In addition, an assist fuel pipe 32 through which assist
fuel flows is inserted into the inside of the furnace from the
outside of the furnace, and passes through the side of the
combustion pipe 26 to extend to the flame stabilization unit 28.
The assist fuel can be supplied to the flame stabilization unit 28
by the assist fuel pipe 32.
[0038] The start-up burner 12 of the embodiment described above is
operated as follows.
[0039] Before the ignition of the ignition torch 42, first, only
the combustion air is supplied from the combustion air supply port
31 to heat the ignition unit 22 to be red-hot. After the
temperature of the ignition unit 22 is increased to an ignition
temperature, the fuel is supplied from the fuel supply port 30 to
the inside of the mixing chamber 20, and the fuel and the
combustion air are mixed with each other. The air ratio (the amount
of air actually injected/the amount of air theoretically needed) at
this time is about 0.4 to 0.7.
[0040] The mixed fuel gas is ignited by the ignition unit 22 and
forms a flame. The flame passes through the opened on-off valve 24
and propagates through the inside of the combustion pipe 26. In
addition, the flame which reaches the flame stabilization unit 28
from the combustion pipe 26 becomes a main flame in the flame
stabilization unit 28 and is burned. At this time, the assist fuel
is supplied to the flame stabilization unit 28 from the assist fuel
pipe 32. Accordingly, the main flame which grows in the flame
stabilization unit 28 is stabilized and is burned.
[0041] On the other hand, the burner main body 41 blows the fuel
gas which is a mixture of air and fuel into the gasification
furnace 1 from the nozzle 54. In the ignition torch 42, when the
main flame of the flame stabilization unit 28 is stabilized, the
main flame flows out from the flame stabilization unit 28, and thus
the fuel gas which is blown into the gasification furnace 1 from
the burner main body 41 is ignited by the flame from the ignition
torch 42, thereby igniting the start-up burner 12.
[0042] Next, a method of using the on-off valve 24 will be
described.
[0043] The inside of the gasification furnace 1 is always
maintained under a high temperature condition in a high pressure
state in order to primarily accelerate the combustion gasification
reaction of char. Therefore, in a case of inspecting the ignition
torch 42, time for depressurizing all of the facilities of the
gasification furnace during an operation under pressure to
atmospheric pressure is necessary, and thus there is a burden of
significant cost and energy consumption for operations of various
types of power units during re-pressurization after the
inspection.
[0044] As described above, in the case where the inspection of the
ignition torch 42 is required, the on-off valve 24 which is
provided on the downstream side of the fuel flow of the ignition
unit 22 that is provided outside the gasification furnace 1 is
used. That is, in a case where the ignition torch 42 has a problem
during torch ignition or during the operation of the start-up
burner and thus needs to be inspected, the on-off valve 24 is
closed in this state. Accordingly, the inside of the gasification
furnace 1 is blocked from the ignition unit 22 side, and thus the
ignition unit 22 side is released to the air and the inspection
operation is performed.
[0045] In the start-up burner 12 of the embodiment which is
configured as described above, a tip end portion 42a of the
ignition torch 42 is disposed on the base end portion side (outside
the furnace) with respect to a tip end portion 41a of the burner
main body 41.
[0046] Specifically, during the non-operation of the ignition torch
42, the tip end portion 42a of the ignition torch 42 is disposed
closer to the base end portion side than the tip end portion 41a of
the burner main body 41. A time of the non-operation of the
ignition torch 42 indicates a time before allowing a flame to
propagate from the base end portion of the ignition torch 42 to the
tip end portion or a time after stopping the propagation of the
flame by the ignition torch 42 after the ignition of the fuel gas
from the burner main body 41.
[0047] In addition, during the operation of the ignition torch 42,
the tip end portion 42a of the ignition torch 42 is disposed at
substantially the same position as that of the tip end portion 41a
of the burner main body 41. A time of the operation of the ignition
torch 42 indicates a time when a flame is allowed to propagate from
the base end portion of the ignition torch 42 to the tip end
portion.
[0048] In this case, the position of the tip end portion 42a during
the non-operation of the ignition torch 42 is set in consideration
of the length of a pipe (combustion pipe 26 and the like) through
which the flame propagates. That is, since the ignition torch 42
has a predetermined length, when a flame propagates from the base
end portion to the tip end portion, the base end portion is
thermally elongated with respect to the furnace wall 1a as the
starting point and the ignition torch 42 is thermally elongated
toward the tip end portion. Therefore, a retreat distance L during
the non-operation of the ignition torch 42 is set so that the tip
end portion 42a of the ignition torch 42 is positioned at
substantially the same position as that of the tip end portion 41a
of the burner main body 41 when the ignition torch 42 operates to
allow a flame to propagate.
[0049] Hereinafter, the action and the effect of the start-up
burner 12 of the embodiment will be described.
[0050] Before the start-up burner 12 is started, the tip end
portion 42a of the ignition torch 42 is positioned on the base end
portion side with respect to the tip end portion 41a of the burner
main body 41 by the retreat distance L. Here, when the ignition
torch 42 is operated, the flame propagates from the base end
portion side to the tip end portion side, and thus the combustion
pipe 26 is heated and reaches a high temperature, thereby causing
thermal elongation toward the tip end portion side in the
longitudinal direction. In this case, in the ignition torch 42, as
illustrated in FIG. 2, the tip end portion 42a is positioned at
substantially the same position as that of the tip end portion 41a
of the burner main body 41. Therefore, the burner main body 41
ignites the fuel gas which is blown into the gasification furnace 1
by receiving the flame from the ignition torch 42 and thus can form
a flame as the start-up burner 12.
[0051] Thereafter, when the flame of the start-up burner 12 (the
burner main body 41) is stabilized, the propagation of the flame by
the ignition torch 42 is stopped, and only the combustion air is
supplied. Therefore, in the ignition torch 42, the combustion pipe
26 is cooled and the temperature thereof is reduced. In this case,
the ignition torch 42 contracts toward the base end portion side in
the longitudinal direction, and as illustrated in FIG. 1, the tip
end portion 42a is positioned at a position where the tip end
portion 42a retreats from the tip end portion 41a of the burner
main body 41. Therefore, since the tip end portion 42a is held at
the position where the tip end portion 42a retreats from the tip
end portion 41a of the burner main body 41 toward the inside, a
thermal load due to the flame of the burner main body 41 is
reduced, and thus the burnout of the ignition torch 42 is
prevented.
[0052] As described above, in the combustion burner of the
embodiment, the burner main body 41 which can blow the fuel gas,
which is a mixture of fuel and air, and the ignition torch 42 which
is disposed inside the burner main body 41 and allows a flame to
propagate from the base end portion so as to be sent out from the
tip end portion are provided, and the tip end portion 42a of the
ignition torch 42 is disposed on the base end portion side with
respect to the tip end portion 41a of the burner main body 41.
[0053] Accordingly, the tip end portion 42a of the ignition torch
42 is disposed on the base end portion side with respect to the tip
end portion 41a of the burner main body 41 when the fuel gas which
is blown from the burner main body 41 is ignited and forms a flame.
Therefore, a thermal load on the tip end portion 42a of the
ignition torch 42 due to the flame of the burner main body 41 can
be reduced, and thus durability can be enhanced and the life span
can be extended.
[0054] In the combustion burner of the embodiment, during the
non-operation of the ignition torch 42, the tip end portion 42a of
the ignition torch 42 is disposed closer to the base end portion
side than the tip end portion 41a of the burner main body 41.
Accordingly, the tip end portion is positioned at the retreat
position during the non-operation of the ignition torch 42, and
thus a thermal load on the tip end portion 42a of the ignition
torch 42 due to the flame of the burner main body 41 can be
reduced.
[0055] Specifically, the tip end portion 42a of the ignition torch
42 is positioned at the retreat position before allowing a flame to
propagate from the base end portion of the ignition torch 42 to the
tip end portion or after stopping the propagation of the flame by
the ignition torch 42 after the ignition of the fuel gas from the
burner main body 41, and thus a thermal load on the tip end portion
42a of the ignition torch 42 due to the flame of the burner main
body 41 can be reduced.
[0056] In the combustion burner of the embodiment, during the
operation of the ignition torch 42, the tip end portion 42a of the
ignition torch 42 is disposed at substantially the same position as
that of the tip end portion 41a of the burner main body 41.
Accordingly, the tip end portion 42a of the ignition torch 42 is
positioned at substantially the same position as that of the tip
end portion 41a of the burner main body 41 during the operation.
Therefore, at this time, the ignition torch 42 can appropriately
ignite the fuel gas which is blown from the burner main body 41 by
the flame which propagates from the base end portion and is sent
out from the tip end portion.
[0057] Specifically, when the flame propagates from the base end
portion of the ignition torch 42 to the tip end portion, the tip
end portion 42a of the ignition torch 42 is positioned at
substantially the same position as that of the tip end portion 41a
of the burner main body 41, and thus the fuel gas which is blown
from the burner main body 41 can be appropriately ignited by the
ignition torch 42.
[0058] In the combustion burner of the embodiment, the position of
the ignition torch 42 during the non-operation is set in
consideration of the length of the combustion pipe 26 through which
the flame propagates. Accordingly, the position during the
operation and the position during the non-operation in the ignition
torch 42 can be appropriately set.
[0059] In addition, in the combustion burner of the embodiment, the
ignition unit 22 is provided in the base end portion of the
ignition torch 42, and the on-off valve is provided on the
downstream side in the fuel flow direction of the ignition unit 22.
Accordingly, regardless of the state of the inside of the
gasification furnace 1, the inspection of the ignition unit 22 can
be easily performed. In addition, the inside of the gasification
furnace 1 and the ignition unit 22 side can be separated from each
other by closing the on-off valve 24. As a result, even in a case
where inspection is required due to various problems, the ignition
unit 22 side can be separated from the gasification furnace 1 by
closing the on-off valve 24, and thus the inspection can be easily
performed regardless of the state of the inside of the gasification
furnace 1.
[0060] In addition, in the gasification furnace 1 of the
embodiment, the burner main body 41 which is fixed to the furnace
wall 1a and can blow the fuel gas, which is a mixture of fuel and
air, into the inside of the furnace, and the ignition torch 42
which is fixed to the furnace wall 1a to be disposed inside the
burner main body 41 and allows a flame to propagate from the base
end portion so as to be sent out from the tip end portion are
provided, and the tip end portion 42a of the ignition torch 42 is
disposed on the base end portion side with respect to the tip end
portion 41a of the burner main body 41.
[0061] Accordingly, a thermal load on the tip end portion 42a of
the ignition torch 42 due to the flame of the burner main body 41
can be reduced, and thus durability can be enhanced and the life
span can be extended.
[0062] In addition, in the above-described embodiment, the
combustion burner of the present invention is applied to the
gasification furnace 1 but is not limited to the gasification
furnace 1. In addition, the ignition torch 42 is configured to
include the ignition unit 22, the on-off valve 24, the combustion
pipe 26, and the flame stabilization unit 28, but is not limited to
this configuration and arrangement.
REFERENCE SIGNS LIST
[0063] 1 GASIFICATION FURNACE [0064] 1a FURNACE WALL [0065] 12
START-UP BURNER (COMBUSTION BURNER) [0066] 20 MIXING CHAMBER [0067]
22 IGNITION UNIT [0068] 24 ON-OFF VALVE [0069] 26 COMBUSTION PIPE
[0070] 28 FLAME STABILIZATION UNIT [0071] 41 BURNER MAIN BODY
[0072] 41a TIP END PORTION [0073] 42 IGNITION TORCH [0074] 42a TIP
END PORTION
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