U.S. patent number 3,844,705 [Application Number 05/410,757] was granted by the patent office on 1974-10-29 for gasified fuel burner for burning a liquid fuel and water in a gaseous mixture.
This patent grant is currently assigned to Kabushiki Kaisha Dowa. Invention is credited to Kingo Miyahara.
United States Patent |
3,844,705 |
Miyahara |
October 29, 1974 |
GASIFIED FUEL BURNER FOR BURNING A LIQUID FUEL AND WATER IN A
GASEOUS MIXTURE
Abstract
A diffuser-vaporizer is rotatably mounted in a combustion
cylinder and formed with an opening which is disposed in spaced
juxtaposed relationship to an opening formed substantially in the
central portion of a gas chamber defined in the combustion
cylinder. There is formed, between the opening in the
diffuser-vaporizer and the opening in the gas chamber, a fuel
scattering clearance large enough for a liquid fuel to move
therethrough and scatter in the combustion cylinder in atomized
particles to sustain combustion of the liquid fuel. A
frusto-conical blast supply member extends through the gas chamber
into the diffuser-vaporizer to supply a stream of air under
pressure to the diffuser-vaporizer and then to the gas chamber. A
liquid fuel and water are supplied to the diffuser-vaporizer to
vaporize quickly on the inner surface of the diffuser-vaporizer. A
combustion plate is provided at the periphery of the gas chamber
for ejecting therethrough a mixture of gasified fuel and steam
together with the stream of air supplied under pressure through the
blast supply member to carry out combustion of the gasified fuel.
Water may be vaporized separately from the liquid fuel in a steam
generating annular chamber provided at the end of a flame ejecting
opening of the combustion cylinder. The superheated steam produced
is supplied through a steam line to the diffuser-vaporizer where it
is mixed with the gasified fuel together with the stream of air
supplied under pressure. Means may be provided for converting the
stream of air supplied under pressure through the blast supply
member into a hot blast and mixing such hot blast with the mixture
of gasified fuel and superheated steam to increase the degree of
efficiency with which combustion of the gasified fuel is carried
out.
Inventors: |
Miyahara; Kingo (Tokyo,
JA) |
Assignee: |
Kabushiki Kaisha Dowa (Tokyo,
JA)
|
Family
ID: |
27295570 |
Appl.
No.: |
05/410,757 |
Filed: |
October 29, 1973 |
Foreign Application Priority Data
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|
|
|
|
May 18, 1973 [JA] |
|
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48-55335 |
Jun 19, 1973 [JA] |
|
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48-73292 |
Jun 19, 1973 [JA] |
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48-73293 |
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Current U.S.
Class: |
431/168;
239/214.25; 431/210; 239/214.17; 431/190; 431/242 |
Current CPC
Class: |
F23D
11/04 (20130101) |
Current International
Class: |
F23D
11/04 (20060101); F23D 11/00 (20060101); F23d
011/04 () |
Field of
Search: |
;431/190,168,162,210,242,243 ;239/214.17X,214.25X |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Favors; Edward G.
Attorney, Agent or Firm: Hill, Gross, Simpson, Van Santen,
Steadman, Chiara & Simpson
Claims
What I claim is:
1. A gasified fuel burner adapted to convert a liquid fuel and
water into a mixture of a gasified fuel and steam for combustion of
the fuel in gasified state, comprising a combustion cylinder, a gas
chamber defined in said combustion cylinder and formed with an
opening substantially in its central portion, a diffuser-vaporizer
rotatably mounted in said combustion cylinder and formed with an
opening disposed in spaced juxtaposed relationship to said opening
in said gas chamber, with a fuel scattering clearance of a size
large enough for the liquid fuel to move therethrough and scatter
in the combustion cylinder in atomized particles formed between the
opening in the diffuser-vaporizer and the opening in the gas
chamber to sustain combustion of the liquid fuel, a frusto-conical
blast supply member extending through the gas chamber into the
diffuser-vaporizer to supply a stream of air under pressure to the
diffuser-vaporizer and then to the gas chamber, a steam generating
annular chamber provided at the end of a flame ejecting opening of
the combustion cylinder for heating supplied water by the heat
produced by combustion of the fuel in liquid state and generating
superheated steam therein, a steam line connected at one end to
said steam generating annular chamber and opening at the other end
in said frusto-conical blast supply member so that the superheated
steam produced in said steam generating annular chamber is mixed
with the gasified fuel produced in said diffuser-vaporizer together
with the stream of air supplied under pressure through the blast
supply member, and a combustion plate provided at the periphery of
the gas chamber for ejecting therethrough a mixture of gasified
fuel and superheated steam together with the stream of air supplied
under pressure through the blast supply member whereby combustion
of the gasified fuel can be carried out satisfactorily.
2. A gasified fuel burner adapted to convert a liquid fuel and
water into a mixture of a gasified fuel and steam for combustion of
the fuel in gasified state, comprising a combustion cylinder, a gas
chamber defined in said combustion cylinder and formed with an
opening substantially in its central portion, a diffuser-vaporizer
rotatably mounted in said combustion cylinder and formed with an
opening disposed in spaced juxtaposed relationship to said opening
in said gas chamber, with a fuel scattering clearance of a size
large enough for the liquid fuel to move therethrough and scatter
in the combustion cylinder in atomized particles formed between the
opening in the diffuser-vaporizer and the opening in the gas
chamber to sustain combustion of the liquid fuel, a frusto-conical
blast supply member extending through the gas chamber into the
diffuser-vaporizer to supply a stream of air under pressure to the
diffuser-vaporizer and then to the gas chamber a steam generating
annular chamber provided at the end of a flame ejecting opening of
the combustion cylinder for heating supplied water by the heat
produced by combustion of the fuel in liquid state and generating
superheated steam therein, a hot blast producing annular chamber
provided outside said steam generating annular chamber, a steam
line connected at one end to said steam generating annular chamber
and opening at the other end in said frusto-conical blast supply
member, and a hot blast duct connected at one end to said hot blast
producing annular chamber and opening at the other end in said
frusto-conical blast supply member, said steam line opening at the
other end in said hot blast duct so that the superheated steam
generated in said steam generating annular chamber is ejected into
said hot blast producing annular chamber and mixed with the
gasified fuel produced in said diffuser-vaporizer while being
ejected through said combustion plate whereby combustion of the
gasified fuel can be carried out satisfactorily.
3. A gasified fuel burner adapted to convert a liquid fuel and
water into a mixture of a gasified fuel and steam for combustion of
the fuel in gasified state, comprising a combustion cylinder, a gas
chamber defined in said combustion cylinder and formed with an
opening substantially in its central portion, a diffuser-vaporizer
rotatably mounted in said combustion cylinder and formed with an
opening disposed in spaced juxtaposed relationship to said opening
in said gas chamber, with a fuel scattering clearance of a size
large enough for liquid fuel to move therethrough and scatter in
the combustion cylinder in atomized particles formed between the
opening in the diffuser-vaporizer and the opening in the gas
chamber to sustain combustion of the liquid fuel, a frusto-conical
blast supply member extending through the gas chamber into the
diffuser-vaporizer to supply a stream of air under pressure to the
diffuser-vaporizer and then to the gas chamber, a liquid fuel
supply line and a water supply line opening on the inner surface of
the diffuser-vaporizer to supply the liquid fuel and water to the
diffuser-vaporizer and cause the same to vaporize quickly, and a
combustion passage provided at the periphery of the gas chamber and
fluidly connected to said diffuser-vaporizer for ejecting at the
periphery of the gas chamber a mixture of gasified fuel and steam
together with the stream of air supplied under pressure through the
blast supply member whereby combustion of the gasified fuel can be
carried out satisfactorily.
Description
This invention relates to burners, and more particularly it is
concerned with a gasified fuel burner adapted to vaporize a liquid
fuel and water and cause a mixture of a gasified fuel and steam to
burn in gaseous state.
The outstanding characteristic of the invention is that a liquid
fuel, particularly kerosene, and water are vaporized by
precombustion and heating of the fuel in liquid form to produce a
gasified fuel and generate steam which gasified fuel and steam are
thoroughly mixed together and ejected through a combustion plate as
a mixture of gasified fuel and steam in atomized particules for
combustion of the gasified fuel.
Heretofore, in gasified fuel burners of the prior art wherein a
liquid fuel is vaporized and burned without producing noise and
odor, the supplied liquid fuel is vaporized in most cases by
suitable means to produce a gasified fuel which is mixed with a
stream of air supplied under pressure before being ejected for
combustion. Thus, although the gasified fuel burners of the type
described offer an advantage in that combustion takes place quietly
without producing noise as is the case with burners adapted to burn
a fuel in liquid state and without producing odor, they do not lend
themselves to economizing on fuel consumption, with only 20 to 30
percent of the fuel being saved by vaporization combustion carried
out by means of conventional gasified fuel burners as compared with
the combustion of a fuel in liquid state.
Accordingly, a principal object of the invention is to provide a
gasified fuel burner wherein a liquid fuel and water are vaporized
into gaseous state and mixed together while they vaporize, and a
mixture of a gasified fuel and steam thus produced is ejected for
combustion with a high degree of efficiency so that fuel
consumption can be greatly reduced.
Another object of the invention is to provide a gasified fuel
burner wherein a liquid fuel is first burned in liquid state and
the heat produced by combustion of the fuel in liquid state is
utilized for expedition vaporization of the liquid fuel and water,
and a mixture of a gasified fuel and steam produced by the
aforementioned precombustion and heating of the fuel in liquid
state is further mixed with a stream of air supplied under pressure
before the mixture is automatically ejected through the combustion
plate for combustion.
A still another object of the invention is to provide a gasified
fuel burner wherein there are separately provided a chamber in
which a liquid fuel is converted into a gasified fuel by
precombustion and heating of the liquid fuel in liquid state and a
chamber in which water is heated to generate superheated steam,
with a gasified fuel and super heated steam being thoroughly mixed
together and ejected through the combustion plate for combustion
while the volume of the gases as a whole is increased.
A further object of the invention is to provide a gasified fuel
burner wherein the superheated steam generated by the heat produced
by precombustion of the liquid fuel in liquid state is injected
into a hot blast which is produced by heating a stream of air under
pressure or blast by the heat produced by precombustion of the
liquid fuel in liquid state, whereby combustion of a gasified fuel
can take place satisfactorily with a high degree of efficiency.
According to the invention, there is provided a gasified fuel
burner wherein a diffuser-vaporizer is rotatably mounted in a
combustion cylinder and formed with an opening which is disposed in
spaced juxtaposed relationship to an opening formed substantially
in the central portion of the gas chamber, with a fuel scattering
clearance of a size large enough for the liquid fuel to move
therethrough and scatter in the combustion cylinder in atomized
particles being formed between the opening in the gas chamber and
the opening in the diffuser-vaporizer to sustain combustion of the
fuel in liquid state; a frustoconical blast supply member extends
through the gas chamber into the diffuser-vaporizer to supply a
stream of air under pressure to the diffuser-vaporizer and then to
the gas chamber; a liquid fuel supply line and a water supply line
opening on the inner surface of the diffuser-vaporizer to supply
the liquid fuel and water to obtain quick vaporization thereof; and
a combustion plate is provided at the periphery of the gas chamber
for ejecting therethrough a mixture of a gasified fuel and steam
together with the stream of air supplied under pressure through the
blast supply member so as to effect combustion of the gasified fuel
with a high degree of efficiency.
According to the invention, there is provided in the gasified fuel
burner of the type described, means for vaporizing the water
separately from the liquid fuel comprising a steam generating
annular chamber disposed at the end of a flame ejecting opening of
the combustion cylinder for obtaining quick vaporization of water
to generate superheated steam by the heat produced by precombustion
of the liquid fuel in liquid state on the inner surface of the
diffuser-vaporizer while the liquid fuel is vaporized on the inner
surface of the diffuser-vaporizer, and a steam line connected at
one end to the steam generating annular chamber and an opening at
the other end in the frusto-conical blast supply member for
introducing the superheated steam therethrough into the
diffuser-vaporizer together with the stream of air supplied under
pressure through the blast supply member.
According to the invention, there is also provided, in the gasified
fuel burner of the type described, means for producing a hot blast
by heating a stream of air under pressure or blast by the heat
produced by precombustion of the fuel in liquid state, so that the
superheated steam can be injected into the hot blast to obtain
improved mixing of not only the superheated steam and hot blast but
also of the gasified fuel and superheated steam, such means
comprising a hot blast producing annular chamber disposed outside
the steam generating annular chamber, a blast duct connected at one
end to the hot blast producing annular chamber to supply a cool
blast thereto, and a hot blast duct connected at one end to the hot
blast producing annular chamber and opening at the other end in the
blast supply member, with the steam line connected at one end to
the steam generating annular chamber and opening at the other end
in the hot blast duct, whereby the superheated steam generated in
the steam generating annular chamber can be injected into a hot
blast produced in the hot blast producing annular chamber while the
superheated steam is mixed with the gasified fuel produced on the
inner surface of the diffuser-vaporizer to produce a mixture of
gasified fuel and superheated steam for combustion through the
combustion plate.
Additional and other objects and features of the invention will
become evident from the description set forth hereinafter when
considered in conjunction with the accompanying drawings, in
which:
FIG. 1 and FIG. 2 illustrate an embodiment of the invention in
which a liquid fuel and water are vaporized in the same vaporizing
chamber, FIG. 1 being a vertical sectional front view of the burner
with certain parts being cut out and FIG. 2 being a side view
thereof;
FIG. 3 to FIG. 6 illustrate another embodiment in which a liquid
fuel and water are vaporized in separate chambers into gaseous
state and mixed together later for combustion, FIG. 3 being a
vertical sectional view of the burner with certain parts being cut
out, FIG. 4 being a sectional view taken along the line IV--IV of
FIG. 3, FIG. 5 being a sectional view taken along the line V--V of
FIG. 3 and FIG. 6 being a perspective view of the frusto-conical
blast supply member; and
FIG. 7 to FIG. 9 illustrate still another embodiment in which a
stream of air supplied under pressure and mixed with a gasified
fuel and steam is heated into a hot blast before being mixed
therewith, FIG. 7 being a vertical sectional front view of the
burner with certain parts being cut out, FIG. 8 being a side view
thereof and FIG. 9 being a sectional view taken along the line
IX--IX of FIG. 7.
The construction of the gasified fuel burner in basic form
according to the invention shown in FIG. 1 and FIG. 2 will now be
described. 1 designates a combustion cylinder defining therein a
gas chamber 2 having a combustion plate 3 mounted at its periphery
for ejecting a mixture of gasified fuel and steam therethrough for
combustion. An opening 4 is formed substantially in the central
portion of the gas chamber. A diffuser-vaporizer 5 formed with an
opening 6 disposed in spaced juxtaposed relationship to the opening
4 is mounted in combustion cylinder 1 and supported for rotation by
a shaft 7 extending through the gas chamber 2 and its opening 4. A
fuel scattering clearance 8 is formed between the opening in the
diffusion-vaporizer 5 and the opening 4 in the gas chamber 2.
The diffuser-vaporizer 5 may be provided on its inner surface with
a rough material layer by mounting thereon a wire netting 9 for
promoting diffusion and vaporization of the liquid fuel.
Alternatively, the wire netting 9 may be done without and a smooth
material layer may be provided instead.
10 designates a frusto-conical blast supply member coaxial with the
rotary shaft 7 and extending through the gas chamber 2 into the
diffuser-vaporizer 5 to supply a stream of air under pressure to
the diffuser-vaporizer 5 and then to the gas chamber 2. 11 is a
fuel supply line for supplying a liquid fuel to the inner surface
of the diffuser-vaporizer 5 while 12 is water supply line for
supplying water to the inner surface of the diffuser-vaporizer 5.
The fuel supply line 11 and the water supply line 12 open in the
vicinity of diffuser elements 13 and 14 respectively which are
separately connected to the rotary shaft 7 for supplying a liquid
fuel and water to the inner surface of the diffuser-vaporizer 5.
Alternatively, the fuel supply line 11 and the water supply line 12
may be made to open in the vicinity of one diffuser element 13, in
place of two diffuser elements 13 and 14 respectively, for
supplying a liquid fuel and water to the inner surface of the
diffuser-vaporizer 5. 15 is an ignition plug.
In operation, the rotary shaft 7 is rotated to operate the
diffuser-vaporizer 5 and at the same time a stream of air is
supplied under pressure through the frusto-conical blast supply
member 10 to the inner surface of the duffuser-vaporizer 5. Then, a
liquid fuel is supplied to the surface of the diffuser element 13
which is rotating with the rotary shaft 7. The supply of liquid
fuel delivered to the diffuser elements 13 moves to the inner
surface of the diffuser-vaporizer 5 while spreading in all
directions. The liquid fuel moves and spreads quickly and uniformly
by virtue of centrifugal forces exerted on the rotating
diffuser-vaporizer 5 and the action of the stream of air supplied
under pressure to the diffuser-vaporizer 5 through the
frusto-conical blast supply member 10. Thus, the liquid fuel mixes
with a portion of the air stream and scatters in atomized particles
through the fuel scattering clearance 8, into the combustion
cylinder 1 where combustion of the liquid fuel in liquid state is
initiated when it is ignited.
As combustion of the liquid fuel is started as a preliminary
combustion step, the rotating diffuser-vaporizer 5 is heated at
once, so that the liquid fuel supplied to its inner surface through
the fuel supply line 11 is vaporized into a gasified fuel while
quickly moving and scattering along the diffuser-vaporizer 5 which
gasified fuel is supplied, together with the stream of air supplied
under pressure through the frusto-conical blast supply member 10,
to the gas chamber 2 where they are mixed together and the mixture
is ejected through the combustion plate 3 for combustion.
When combustion of gasified liquid is initiated as aforementioned,
water is supplied through the water supply line 12 and the rotating
diffuser element 14 and sprinkled on to the surface of the
diffuser-vaporizer 5. The water is vaporized and expands to
generate steam while it moves and spreads quickly on the
diffuser-vaporizer 5 by virtue of heating of diffuser-vaporizer 5,
centrifugal forces exerted on the rotating diffuser-vaporizer 5 and
the action of the stream of air supplied under pressure through the
frusto-conical blast supply member 10. Thus, the diffuser-vaporizer
5 simultaneously performs the functions of producing a gasified
fuel and generating steam, and the gasified fuel and steam produced
in this way are mixed together. The mixture is thoroughly mixed
with the stream of air while the former is introduced under
pressure into the gas chamber 2 by the latter, and the mixture of
gasified fuel, steam and air is ejected through the combustion
plate 3 for combustion. Flames produced when such mixture of
gasified fuel, steam and air is burned have a high temperature
because the mixture contains moisture.
FIG. 3 to FIG. 6 illustrate a second embodiment of the invention
which represents a modification of the aforementioned basic form of
the burner according to the invention. As shown, the burner further
comprises a steam generating annular chamber 16 disposed at the
periphery of a flame ejection opening 17, and a steam line 18
connected at one end to the steam generating annular chamber 16 and
opening at the other end in the frusto-conical blast supply member
10. By this means, the liquid fuel is converted into a gasified
fuel by the rotating diffuser-vaporizer 5 while the water is
quickly heated and generates superheated steam in the steam
generating annular chamber 16 as it is heated by the heat produced
by precombustion of the liquid fuel in liquid state, with the
superheated steam being ejected into the blast supply member 10
through which the stream of air moves under pressure. Thus, the
arrangement is effective to obtain a better mixing of the gasified
fuel with the superheated steam so that combustion of the gasified
fuel can be carried out more satisfactorily than in conventional
gasified fuel burners.
The steam generating annular chamber 16 is coated on its inner
surface with a moisture-containing material layer 19 for converting
water into steam as quickly as possible by precombustion and
heating of the liquid fuel in liquid state on the
diffuser-vaporizer 5. Water is supplied through a water supply line
20 opening at one end in the steam generating annular chamber 16.
In the second embodiment shown and described above, a suitable
number of rotary guide vanes 21 best seen in FIG. 6 may be provided
at the forward end of the frusto-conical blast supply member 10 to
cause the stream of air supplied under pressure through the blast
supply member 10 to be ejected in a direction opposite to the
direction of rotation of the diffuser-vaporizer 5 so as to thereby
promote diffusion, scattering and vaporization of the liquid
fuel.
Characteristic of the second embodiment described above is that the
liquid fuel and water are vaporized separately in the
diffuser-vaporizer 5 and steam generating annular chamber 16
respectively. This arrangement permits vaporization and combustion
of not only a small volume of fuel and water but also a large
volume thereof to be carried out any time as desired. Besides, the
steam generated in this way is a superheated steam which is capable
of attaining better mixing with gasified fuel to enable
vaporization and combustion of liquid fuel to be carried out with a
higher degree of efficiency.
FIG. 7 to FIG. 8 illustrate a third embodiment which represents a
modification of the second embodiment. As shown, the third
embodiment of the invention further comprises means for converting
the stream of air supplied under pressure through the
frusto-conical blast supply member into a hot blast before
producing a mixture thereof with the mixture of gasified fuel and
superheates steam. More specifically, such means comprises a hot
blast producing annular chamber 22 disposed directly outside the
steam generating annular chamber 16 described with reference to the
second embodiment, a blast duct 23 connected at one end to the hot
blast producing annular chamber 22 to supply a cool blast to the
interior of the hot blast producing annular chamber 22, and a hot
blast duct 24 connected at one end to the hot blast producing
annular chamber 22 and opening at the other end in the interior of
the blast supply member 10. The steam line 18 connected at one end
to the steam generating annular chamber 16 opens at the other end
in the interior of the hot blast duct so as to thoroughly mix
superheated steam with hot blast and injecting the mixture into the
diffuser-vaporizer 5 together with the stream of air supplied under
pressure through the frusto-conical air blast member 10 thereby
attaining better mixing of the gasified fuel with the superheated
steam and increasing the volume of gases. Thus, combustion of the
gasified liquid fuel can be carried out satisfactorily.
From the foregoing description, it will be appreciated that
according to the invention, the rotating diffuser-vaporizer 5 is
quickly heated by precombustion of the liquid fuel in liquid state,
and not only the liquid fuel supplied to the diffuser-vaporizer 5
thereafter but also the water supplied thereto is vaporized
simultaneously. The gasified fuel and steam produced in this way
are mixed together with a stream of air supplied under pressure
through the blast supply member to produce a perfect mixture of
gasified fuel, steam and air for combustion. The invention offers
the advantages of permitting to greatly economize on fuel,
increasing the volume of gases to sustain combustion at elevated
temperatures over a prolonged period, and producing flames which
contains mixture because of mixing of fuel with steam to thereby
naturalize noxious components of gases. Thus, the gasified fuel
burner according to the invention is devoid of the danger of
emitting noxious gases and highly efficient in operation.
While the invention has been shown and described with reference to
some embodiments thereof, it is to be understood that the invention
is not limited to the specific forms of the embodiments and that
many changes and modifications may be made therein without
departing from the spirit and scope of the invention.
* * * * *