JPH10132218A - Fuel injection burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently mix fuel with injection medium, to improve a combustion efficiency and to reduce Nox by opening an injection medium supply hole at a base end of an injection hole so that a center axis of the medium supply hole is deviated to an inner peripheral wall opposed to the fuel injection hole with regard to that of the injection hole. SOLUTION: Fuel S is supplied from a fuel supply hole 10 into an injection hole 13. Then, when a spraying medium supply hole 15 is opened with a base end of the hole 13 so that an axial center O2 of the hole 15 is deviated to an inner peripheral wall side opposed to the hole 10 of the hole 13 to that O1 of the hole 13, an inner peripheral wall of the hole 13 opposed to the hole 10 is protected by spraying medium V to eliminate deviated flow of the fuel S supplied into the hole 13 in shape to collide with the inner peripheral wall side of the hole 13 opposed to the hole 10, but to pass substantially a center of the hole 13, thereby expediting mixture of the fuel S with the medium V.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection burner.

[0002]

2. Description of the Related Art Generally, as a fuel injection burner used for a power generation boiler or the like, there is a fuel injection burner as shown in FIG.

[0003] In Fig. 10, reference numeral 1 denotes a hollow tubular barrel tube. A hollow tubular barrel tube 2 having a plug 3 screwed to a tip thereof is inserted and arranged in the barrel tube 1 in a concentric manner. At the tip of the burner tip 5, a burner tip 5 is provided so as to abut. The barrel tube 1, the plug 3, and the burner tip 5 are screwed to the outer periphery of the barrel tube 1, and the tip of the They are integrally fastened by the engaging tip nut 6.

[0004] The barrel tube 1 and the barrel tube 2
A flow path 7 for supplying a fuel S such as heavy oil is formed between the fuel tank 1 and the inside of the barrel tube 2 for miniaturizing the fuel S so as to perform good combustion when the fuel S is injected. A flow path 8 for supplying a spray medium V such as steam is formed.

[0005] The plug 3 communicates with the flow path 7 and the fuel S
Is formed to guide the gas to the burner chip 5.

The burner chip 5 has a hollow portion 9 into which the spray medium V is introduced from the flow channel 8, a spray medium supply hole 15 communicating with the hollow portion 9, and a flow channel 14 of the plug 3. And the fuel supply hole 1 in the inner peripheral wall surface.
0 is opened and the spray medium supply hole 15 is opened at the base end, and an injection hole 13 for mixing the fuel S and the spray medium V and injecting the fuel S in a mist by the pressure of the spray medium V is formed. ing.

In a fuel injection burner as shown in FIG. 10, fuel S is introduced from a flow path 7 through a flow path 14 of a plug 3 into a fuel supply hole 10 of a burner chip 5, and injected from the fuel supply hole 10. While being guided to the hole 13, the spray medium V
Is introduced into the spray medium supply hole 15 from the flow path 8 through the hollow portion 9 of the burner chip 5 and is guided from the spray medium supply hole 15 to the injection hole 13 where the fuel S and the spray medium V are separated. The fuel S is mixed by the pressure of the spray medium V
Is atomized into fine particles and is injected to perform combustion.

On the other hand, CWM which is a mixed fluid of coal and water
As a fuel injection burner for injecting and burning a slurry-like fuel called (coal-water-mixture), there is a conventional one shown in FIG.

The fuel injection burner shown in FIG. 12 is a combination of intermediate mixing and internal mixing, and has a hollow tubular barrel tube 1 having a hollow plug 3 'fixed at the tip thereof. The burner plate 4 is disposed so as to abut on the tip of the barrel tube 1 and the plug 3 ′, and the burner tip 5 ′ is abutted on the tip of the burner plate 4. Has been established,
The barrel tube 1, the burner plate 4, and the burner tip 5 ′ are screwed to the outer periphery of the barrel tube 1, and are integrally fastened by a tip nut 6 whose tip engages with a step portion of the burner tip 5 ′.

A flow path 7 ′ for supplying a slurry-like fuel S ′ is formed in the barrel tube 2, and the fuel S ′ is provided between the barrel tube 2 and the plug 3 ′ and the barrel tube 1. A flow path 8 ′ for supplying a spray medium V such as steam for miniaturizing the fuel S ′ is formed so that the combustion is favorably performed during the injection.

The burner plate 4 has a hollow portion 9 'into which fuel S' is introduced from a flow path 7 'via a plug 3'.
A fuel supply hole 10 ′ communicating with the hollow portion 9 ′; a spray medium supply hole 15 ′ communicating with the flow path 8 ′; The spray medium supply hole 15 ′ is opened, and an intermediate mixing chamber 11 for mixing the fuel S ′ and the spray medium V is formed.

An intermediate mixing chamber 1 is provided in the burner chip 5 '.
1; an internal mixing chamber 12 for remixing the fuel / spray medium mixed fluid B mixed in 1;
An injection hole 13 'is formed for injecting the spray medium mixed fluid B so as to radially spread to the outside.

In a fuel injection burner as shown in FIG. 12, a slurry-like fuel S 'is introduced from a flow path 7' into a fuel supply hole 10 'through a plug 3' and a hollow portion 9 'of a burner plate 4. The spray medium V is guided from the fuel supply hole 10 ′ to the intermediate mixing chamber 11, while the spray medium V is introduced from the flow path 8 ′ to the spray medium supply hole 15 ′ of the burner plate 4, and the intermediate medium is mixed through the spray medium supply hole 15 ′. The fuel S ′ and the spray medium V are mixed in the intermediate mixing chamber 11 to generate the fuel / spray medium mixed fluid B. The fuel / spray medium mixed fluid B is discharged from the intermediate mixing chamber 11. The mixture enters the internal mixing chamber 12 of the burner chip 5 'and is remixed, and the injection holes 13'
The fuel is injected from the tip of the nozzle to be miniaturized and burned.

[0014]

However, FIG.
In the case of a fuel injection burner as shown in FIG. 11, as shown in FIG. 11, the fuel S is supplied into the injection hole 13 from the fuel supply hole 10 opened on the inner peripheral wall surface of the injection hole 13. The fuel S supplied into the nozzle 13 flows unevenly in such a manner as to collide with the inner peripheral wall surface of the injection hole 13 facing the fuel supply hole 10, and the spray of the fuel S becomes coarse,
In some cases, a decrease in combustion efficiency or an increase in NOx is caused, or the inner peripheral wall surface of the injection hole 13 facing the fuel supply hole 10 is locally worn, so that the life of the fuel injection burner is extremely shortened.

On the other hand, in the case of a fuel injection burner as shown in FIG. 12, as shown in FIG. 13, fuel S 'is supplied from a fuel supply hole 10' which opens to the inner peripheral wall of the intermediate mixing chamber 11 through the intermediate mixing chamber. 11, the intermediate mixing chamber 11
The fuel S ′ supplied to the inside flows unevenly toward the inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11, and the fuel S ′ and the spray medium V are sufficiently mixed in the intermediate mixing chamber 11. And the fuel S ′ thus biased flows along the inner wall of the internal mixing chamber 12, and the fuel S ′ and the spray medium V
There is a tendency that the fuel S is not sufficiently mixed, and the spray of the fuel S becomes coarse, which causes a decrease in combustion efficiency and an increase in NOx.

In view of such circumstances, the present invention can sufficiently mix a fuel and a spray medium, can improve fuel spray, improve combustion efficiency, and reduce NOx. It is another object of the present invention to provide a fuel injection burner that can suppress local wear and extend the life.

[0017]

According to a first aspect of the present invention, a fuel supply hole is opened on an inner peripheral wall surface and a spray medium supply hole is opened at a base end, and the fuel and the spray medium are mixed, and the pressure of the spray medium is reduced. A fuel injection burner having an injection hole for injecting fuel in a mist state, wherein the axis of the spray medium supply hole is closer to the inner peripheral wall surface facing the fuel supply hole of the injection hole with respect to the axis of the injection hole. The fuel injection burner is characterized in that the spray medium supply hole is opened at the base end of the injection hole so as to be eccentric.

According to a second aspect of the present invention, a fuel supply hole is opened on an inner peripheral wall surface and a spray medium supply hole is opened at a base end, the fuel and the spray medium are mixed, and the fuel is atomized by the pressure of the spray medium. A fuel injection burner provided with an injection hole for injecting, wherein a flow path for guiding a spray medium toward an inner peripheral wall surface of the injection hole and a spray medium guided from the flow path into the injection hole are provided to a spray medium supply hole. A fuel injection burner characterized in that a spray medium flow restricting member having a cone portion for moving the portion toward the center of the injection hole is fitted.

According to a third aspect of the present invention, there is provided an intermediate mixing chamber for mixing a fuel and a spray medium, wherein a fuel supply hole is opened in an inner peripheral wall surface and a spray medium supply hole is opened at a base end. An internal mixing chamber for remixing the fuel / spray medium mixed fluid and injecting the fuel from the injection hole, wherein the fuel supply hole is provided in the intermediate mixing chamber on a side far from the axis of the internal mixing chamber. The present invention relates to a fuel injection burner characterized by having an opening in a peripheral wall surface.

According to a fourth aspect of the present invention, there is provided an intermediate mixing chamber in which a fuel supply hole is opened in an inner peripheral wall surface and a spray medium supply hole is opened in a base end, and a fuel and a spray medium are mixed. A fuel injection burner having an internal mixing chamber for remixing a fuel / spray medium mixed fluid and injecting the mixture from an injection hole, wherein an opening of the intermediate mixing chamber with respect to the internal mixing chamber is directed toward the center of the internal mixing chamber. And a fuel injection burner characterized in that the intermediate mixing chamber is arranged obliquely with respect to the axis of the internal mixing chamber.

In the third invention or the fourth invention, the axis of the spray medium supply hole is eccentric with respect to the axis of the intermediate mixing chamber toward the inner peripheral wall surface facing the fuel supply hole of the intermediate mixing chamber. Thus, the spray medium supply hole can be opened at the base end of the intermediate mixing chamber.

In the third and fourth aspects of the present invention, a flow path for guiding the spray medium toward the inner peripheral wall of the intermediate mixing chamber is provided to the spray medium supply hole, and the flow path is guided from the flow path to the intermediate mixing chamber. A spray medium flow restricting member having a cone portion for directing a part of the spray medium toward the center of the intermediate mixing chamber can be fitted.

According to the above means, the following effects can be obtained.

As in the first invention, the spray medium supply hole is formed so that the axis of the spray medium supply hole is eccentric with respect to the axis of the injection hole toward the inner peripheral wall surface facing the fuel supply hole of the injection hole. When opened at the base end of the injection hole, the inner peripheral wall surface facing the fuel supply hole of the injection hole is protected by the spray medium, and the fuel supplied into the injection hole is exposed to the inner circumference facing the fuel supply hole of the injection hole. It does not flow unevenly in such a way as to collide with the wall surface, passes through the approximate center of the injection hole, promotes mixing of fuel and spray medium, improves fuel spray, and improves combustion efficiency In addition to reducing the NOx, the inner peripheral wall surface of the injection hole facing the fuel supply hole is not locally worn.

As in the second invention, a flow path for guiding the spray medium toward the inner peripheral wall surface of the injection hole into the spray medium supply hole, and a part of the spray medium guided from the flow path into the injection hole is supplied to the spray hole. When the spray medium flow restricting member having a cone portion directed toward the center of the nozzle is fitted, the inner peripheral wall surface of the injection hole is protected by the spray medium guided from the flow path of the spray medium flow restricting member into the injection hole. By the flow of the spray medium toward the center of the injection hole along the cone portion of the spray medium flow restricting member, the fuel supplied into the injection hole is directed toward the center of the injection hole and moves substantially toward the center of the injection hole. As a result, the fuel does not flow eccentrically in such a way as to collide with the inner peripheral wall surface facing the fuel supply hole of the injection hole, the mixing of the fuel and the spray medium is promoted, and the fuel spray becomes good, As well as improving combustion efficiency and reducing NOx In addition, the inner peripheral wall surface of the injection hole facing the fuel supply hole is not locally worn.

According to the third aspect of the present invention, when the fuel supply hole is opened in the inner peripheral wall surface of the intermediate mixing chamber on a side far from the axis of the internal mixing chamber, the fuel flows from the intermediate mixing chamber to the axis of the internal mixing chamber. It does not flow to the near side, and does not flow along the inner wall of the internal mixing chamber, the fuel and the spray medium are sufficiently mixed in the internal mixing chamber, the fuel spray is improved, the combustion efficiency is improved, and It also leads to NOx reduction.

According to a fourth aspect of the present invention, when the intermediate mixing chamber is inclined with respect to the axis of the internal mixing chamber such that the opening of the intermediate mixing chamber with respect to the internal mixing chamber faces the center of the internal mixing chamber,
Fuel flows from the intermediate mixing chamber to the center side of the internal mixing chamber,
It does not flow along the inner wall of the internal mixing chamber, the fuel and the spray medium are sufficiently mixed in the internal mixing chamber, the fuel spray is improved, the combustion efficiency is improved, and the NOx is reduced. .

In the third invention or the fourth invention, the axis of the spray medium supply hole is eccentric toward the inner peripheral wall face facing the fuel supply hole of the intermediate mixing chamber with respect to the axis of the intermediate mixing chamber. When the spray medium supply hole is opened at the base end of the intermediate mixing chamber, the inner peripheral wall facing the fuel supply hole of the intermediate mixing chamber is protected by the spray medium, and the fuel supplied to the intermediate mixing chamber is supplied to the intermediate mixing chamber. The fuel does not flow unevenly in such a way that it collides with the inner peripheral wall side facing the fuel supply hole of the fuel supply hole, and flows through substantially the center of the intermediate mixing chamber. Fuel is prevented from flowing along the inner wall of the internal mixing chamber, the fuel and the spray medium are sufficiently mixed also in the internal mixing chamber, and the fuel spray is improved, and the combustion efficiency is improved. Improves and reduces NOx In addition, the inner peripheral wall surface facing the fuel supply hole of the intermediate mixing chamber is not locally worn.

In the third invention or the fourth invention, a flow path for guiding the spray medium toward the inner peripheral wall of the intermediate mixing chamber through the spray medium supply hole, and a flow path for the spray medium guided from the flow path into the intermediate mixing chamber. When a spray medium flow restricting member having a cone portion that partially faces the center of the intermediate mixing chamber is fitted, the inner peripheral wall surface of the intermediate mixing chamber is guided from the flow path of the spray medium flow restricting member into the intermediate mixing chamber. While being protected by the spray medium, the flow of the spray medium toward the center of the intermediate mixing chamber along the cone of the spray medium flow restricting member causes the fuel supplied to the intermediate mixing chamber to flow to the center of the intermediate mixing chamber. In the opposite direction, the fuel flows through the substantially central portion of the intermediate mixing chamber, and does not flow unevenly in such a way as to collide with the inner peripheral wall surface facing the fuel supply hole of the intermediate mixing chamber. Enhanced mixing with spray medium In addition, the fuel does not flow along the inner wall of the internal mixing chamber, and the fuel and the spray medium are sufficiently mixed even in the internal mixing chamber, so that the fuel is sprayed well and the combustion efficiency is improved. In addition to reducing the NOx, the inner peripheral wall surface of the intermediate mixing chamber facing the fuel supply hole is not locally worn.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first example of an embodiment of the present invention. In FIG. 1, the portions denoted by the same reference numerals as those in FIGS. 10 and 11 represent the same components, and the basic configuration is as follows. 10 and 11 is the same as the conventional one shown in FIGS. 10 and 11, except that the axis O ₂ of the spray medium supply hole 15 is changed to the axis O of the injection hole 13 as shown in FIG. _The point is that the spray medium supply hole 15 is opened at the base end of the injection hole 13 so as to be eccentric to the inner peripheral wall surface of the injection hole 13 facing the fuel supply hole 10 with respect to 1.

Next, the operation of the illustrated example will be described.

The fuel S is supplied to the injection holes 13 as in the conventional case.
From the fuel supply hole 10 opening to the inner peripheral wall of the fuel injection hole 13
Is supplied to the spray medium supply hole 15 as described above.
Heart O _TwoIs the axis O of the injection hole 13₁Of the injection hole 13
So as to be eccentric toward the inner peripheral wall facing the material supply hole 10,
The spray medium supply hole 15 is opened at the base end of the injection hole 13.
And the inner peripheral wall surface of the injection hole 13 facing the fuel supply hole 10
Protected by the spray medium V and supplied into the injection holes 13
Of the fuel S facing the fuel supply hole 10 of the injection hole 13
It does not flow unevenly in such a way as to collide with the peripheral wall side
The fuel S passes through the substantially central portion of the injection hole 13 and the fuel S
Of the fuel S and the spray medium V are promoted, and the spray of the fuel S is good.
Which leads to improved combustion efficiency and reduced NOx
And an inner peripheral wall of the injection hole 13 facing the fuel supply hole 10.
There is no local wear on the surface side.

Thus, the fuel S and the spray medium V can be sufficiently mixed, the spray of the fuel S can be improved, the combustion efficiency can be improved, and the NOx can be reduced. Wear can be suppressed to extend the life.

FIGS. 2 and 3 show a second embodiment of the present invention. In the figure, the portions denoted by the same reference numerals as those in FIG. A flow path 16 for guiding the spray medium V toward the inner peripheral wall of the injection hole 13;
The spray medium flow restricting member 18 having a cone portion 17 for directing a part of the spray medium V guided from the flow path 16 into the injection hole 13 toward the center of the injection hole 13 is fitted.

In the example shown in FIGS. 2 and 3, the fuel S
Is supplied from the fuel supply hole 10 opening on the inner peripheral wall surface of the injection hole 13 into the injection hole 13 as in the conventional case. A flow path 16 for guiding the spray medium V toward the wall surface, and a part of the spray medium V guided from the flow path 16 into the injection hole 13
When the spray medium flow restricting member 18 having the cone portion 17 directed toward the center of the spray medium is fitted, the inner peripheral wall surface of the injection hole 13 is sprayed from the flow path 16 of the spray medium flow restricting member 18 into the injection hole 13. The fuel S supplied into the injection hole 13 is protected by the medium V and is supplied into the injection hole 13 by the flow of the spray medium V toward the center of the injection hole 13 along the cone 17 of the spray medium flow restricting member 18. 13 and pass through substantially the center of the injection hole 13 so that the fuel does not flow unevenly in such a way as to collide with the inner peripheral wall surface of the injection hole 13 facing the fuel supply hole 10. S and spray medium V
Is promoted, the spraying of the fuel S is improved, the combustion efficiency is improved and the NOx is reduced, and the inner peripheral wall surface of the injection hole 13 facing the fuel supply hole 10 may be locally worn. Disappears.

Thus, also in the case of the examples shown in FIGS. 2 and 3, the fuel S and the spray medium V can be sufficiently mixed, the spray of the fuel S can be improved, the combustion efficiency can be improved, and the N can be improved.
Ox can be reduced, and further, local wear can be suppressed to extend the life.

FIG. 4 shows a third embodiment of the present invention. In FIG. 4, the parts denoted by the same reference numerals as those in FIGS. To the intermediate mixing chamber 1 on the side remote from the axis O of the internal mixing chamber 12.
1 is opened on the inner peripheral wall surface. In this case, the spray medium V is flown through the flow path 7 ′ formed in the barrel tube 2, and the slurry medium is flown through the flow path 8 ′ formed between the barrel tube 2 and the plug 3 ′ and the barrel tube 1. Of the fuel S ′.

In the example shown in FIG. 4, the fuel S 'is supplied into the intermediate mixing chamber 11 from a fuel supply hole 10' opened in the inner peripheral wall of the intermediate mixing chamber 11, as in the conventional case. The fuel S ′ supplied into the mixing chamber 11 flows unevenly toward the inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11. When the fuel S ′ flows from the intermediate mixing chamber 11 to the side closer to the axis O of the internal mixing chamber 12, the fuel S ′ flows from the intermediate mixing chamber 11 to the side closer to the axis O of the internal mixing chamber 12. No longer flows along the inner wall,
The fuel S 'and the spray medium V are sufficiently mixed in the internal mixing chamber 12, so that the spray of the fuel S' is improved, the combustion efficiency is improved, and the NOx is reduced.

Thus, in the case of the example shown in FIG. 4, the fuel S 'and the spray medium V can be sufficiently mixed, the spray of the fuel S' can be improved, the combustion efficiency can be improved, and NOx can be improved.
Can be reduced.

FIG. 5 shows a modification of the third embodiment of the present invention shown in FIG.
Is opened on the inner peripheral wall of the intermediate mixing chamber 11 on the side far from the axis O of the internal mixing chamber 12, and the axis O ₂ ′ of the spray medium supply hole 15 ′ is aligned with the axis O ₁ ′ of the intermediate mixing chamber 11. The spray medium supply hole 15 ′ is opened at the base end of the intermediate mixing chamber 11 so as to be eccentric toward the inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11.

In the example shown in FIG. 5, the fuel S 'is supplied into the intermediate mixing chamber 11 from a fuel supply hole 10' opened on the inner peripheral wall surface of the intermediate mixing chamber 11. The hole 10 ′ is opened in the inner peripheral wall of the intermediate mixing chamber 11 on the side far from the axis O of the internal mixing chamber 12, and the axis O ₂ ′ of the spray medium supply hole 15 ′ is connected to the intermediate mixing chamber 1.
The spray medium supply hole 15 ′ is opened at the base end of the intermediate mixing chamber 11 so as to be eccentric with respect to _one axis O ₁ ′ toward the inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11. The inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11 is protected by the spray medium V, and the fuel S ′ supplied into the intermediate mixing chamber 11 is supplied to the fuel supply hole 10 ′ of the intermediate mixing chamber 11. No longer flows in such a way as to collide with the inner peripheral wall surface facing the inner peripheral wall surface, and passes through the substantially central portion of the intermediate mixing chamber 11, whereby the fuel S 'and the spray medium V in the intermediate mixing chamber 11 Mixing is promoted, and the fuel S 'does not flow along the inner wall of the internal mixing chamber 12, and the fuel S' and the spray medium V
And the fuel S 'is sprayed well, the combustion efficiency is improved and the NOx is reduced, and the inner peripheral wall surface of the intermediate mixing chamber 11 facing the fuel supply hole 10' is locally localized. Wear is also eliminated.

Thus, in the case of the example shown in FIG. 5, the fuel S 'and the spray medium V can be sufficiently mixed, the spray of the fuel S' can be improved, the combustion efficiency can be improved, and NOx can be improved.
Can be reduced, and further, local wear can be suppressed to extend the life.

FIG. 6 shows another modification of the third embodiment of the present invention shown in FIG.
0 ′ is opened on the inner peripheral wall surface of the intermediate mixing chamber 11 on the side remote from the axis O of the internal mixing chamber 12, and the spray medium V is supplied to the spray medium supply hole 15 ′ near the inner peripheral wall surface of the intermediate mixing chamber 11. And a cone portion 17 for directing a part of the spray medium V guided from the flow path 16 into the intermediate mixing chamber 11 toward the center of the intermediate mixing chamber 11. It is fitted.

In the example shown in FIG. 6, the fuel S 'is supplied into the intermediate mixing chamber 11 from a fuel supply hole 10' opened in the inner peripheral wall of the intermediate mixing chamber 11, but as described above, The hole 10 ′ is opened in the inner peripheral wall surface of the intermediate mixing chamber 11 on the side remote from the axis O of the internal mixing chamber 12, and the spray medium supply hole 15 ′ is provided near the inner peripheral wall surface of the intermediate mixing chamber 11. A spray medium flow restricting member 18 having a flow path 16 for guiding the V and a cone 17 for directing a part of the spray medium V guided from the flow path 16 into the intermediate mixing chamber 11 toward the center of the intermediate mixing chamber 11. Into the intermediate mixing chamber 11
Of the spray medium flow restricting member 18 is protected by the spray medium V guided from the flow path 16 of the spray medium flow restricting member 18 into the intermediate mixing chamber 11, and the intermediate mixing chamber 11 extends along the cone 17 of the spray medium flow restricting member 18. The fuel S ′ supplied into the intermediate mixing chamber 11 flows toward the center of the intermediate mixing chamber 11 and passes through the approximate center of the intermediate mixing chamber 11 due to the flow of the spray medium V toward the center of the intermediate mixing chamber 11. Fuel supply hole 1 in intermediate mixing chamber 11
It does not flow unevenly in such a way that it collides with the inner peripheral wall side facing 0 ′, and the mixing of the fuel S ′ and the spray medium V in the intermediate mixing chamber 11 is promoted. The fuel S 'does not flow along the inner wall of the mixing chamber 12, the fuel S' and the spray medium V are sufficiently mixed even in the internal mixing chamber 12, the fuel S 'is sprayed well, and the combustion efficiency is reduced. In addition to the improvement and reduction of NOx, the inner peripheral wall surface of the intermediate mixing chamber 11 facing the fuel supply hole 10 'is not locally worn.

Thus, also in the example shown in FIG. 6, the fuel S 'and the spray medium V can be sufficiently mixed, the spray of the fuel S' can be improved, the combustion efficiency can be improved, and the NOx can be improved.
Can be reduced, and further, local wear can be suppressed to extend the life.

FIG. 7 shows a fourth embodiment of the present invention. In FIG. 7, the parts denoted by the same reference numerals as those in FIGS. 12 and 13 represent the same parts. The intermediate mixing chamber 11 is arranged to be inclined with respect to the axis O of the internal mixing chamber 12 so that the opening to the internal mixing chamber 12 faces the center of the internal mixing chamber 12.

In the example shown in FIG. 7, the fuel S 'is supplied into the intermediate mixing chamber 11 from a fuel supply hole 10' opened in the inner peripheral wall of the intermediate mixing chamber 11, as in the conventional case. Although the fuel S ′ supplied into the mixing chamber 11 flows unevenly toward the inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11, as described above, the internal mixing chamber 1 of the intermediate mixing chamber 11
When the intermediate mixing chamber 11 is arranged obliquely with respect to the axis O of the internal mixing chamber 12 so that the opening for 2 is directed toward the center of the internal mixing chamber 12, the fuel S ′ is transferred from the intermediate mixing chamber 11 to the internal mixing chamber 12. The fuel does not flow toward the center and does not flow along the inner wall of the internal mixing chamber 12, and the fuel S 'and the spray medium V are sufficiently mixed in the internal mixing chamber 12, so that the fuel S' is sprayed well. And the combustion efficiency is improved and NOx is reduced.

Thus, in the case of the example shown in FIG. 7, the fuel S 'and the spray medium V can be sufficiently mixed, the spray of the fuel S' can be improved, the combustion efficiency can be improved, and NOx can be improved.
Can be reduced.

FIG. 8 shows a modification of the fourth embodiment of the present invention shown in FIG. 7, in which the opening of the intermediate mixing chamber 11 with respect to the internal mixing chamber 12 is directed toward the center of the internal mixing chamber 12. The intermediate mixing chamber 11 is inclined with respect to the axis O of the internal mixing chamber 12 so as to face the spray medium supply hole 15 ′.
The spray medium supply hole 15 ′ so that the axis O ₂ ′ of the intermediate mixing chamber 11 is eccentric toward the inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11 with respect to the axis O ₁ ′ of the intermediate mixing chamber 11. The opening is provided at the base end of the intermediate mixing chamber 11.

In the example shown in FIG. 8, the fuel S 'is supplied into the intermediate mixing chamber 11 from a fuel supply hole 10' opened in the inner peripheral wall of the intermediate mixing chamber 11, but as described above, The intermediate mixing chamber 11 is inclined with respect to the axis O of the internal mixing chamber 12 so that the opening of the chamber 11 with respect to the internal mixing chamber 12 faces the center of the internal mixing chamber 12, and the spray medium supply hole 15 ′ is formed. The axis O ₂ ′ is the axis O ₁ ′ of the intermediate mixing chamber 11.
With respect to the inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11 so as to be eccentric to the spray medium supply hole 15 ′.
Is opened at the base end of the intermediate mixing chamber 11, the inner peripheral wall surface facing the fuel supply hole 10 ′ of the intermediate mixing chamber 11 is protected by the spray medium V, and the fuel S ′ supplied into the intermediate mixing chamber 11 is The flow does not flow in a biased manner so as to collide with the inner peripheral wall surface of the intermediate mixing chamber 11 facing the fuel supply hole 10 ′, and passes through the approximate center of the intermediate mixing chamber 11. The mixing of the fuel S 'and the spray medium V in the fuel cell 11 is promoted, and the fuel S'
Flows into the center of the internal mixing chamber 12 from the internal mixing chamber 1
2, the fuel S ′ and the spray medium V are sufficiently mixed even in the internal mixing chamber 12, the spraying of the fuel S ′ becomes good, and the combustion efficiency is improved. In addition to reducing the NOx, the inner peripheral wall surface of the intermediate mixing chamber 11 facing the fuel supply hole 10 ′ is not locally worn.

Thus, in the case of the example shown in FIG. 8, the fuel S 'and the spray medium V can be sufficiently mixed, the spray of the fuel S' can be improved, the combustion efficiency can be improved, and the NOx can be improved.
Can be reduced, and further, local wear can be suppressed to extend the life.

FIG. 9 shows another modification of the fourth embodiment of the present invention shown in FIG.
The intermediate mixing chamber 11 is arranged obliquely with respect to the axis O of the internal mixing chamber 12 such that the opening of the internal mixing chamber 12 is directed toward the center of the internal mixing chamber 12.
5 ′, a flow path 16 for guiding the spray medium V toward the inner peripheral wall of the intermediate mixing chamber 11 and a part of the spray medium V guided from the flow path 16 into the intermediate mixing chamber 11 Medium restricting member 1 having a cone portion 17 directed toward the spray portion
8 is fitted.

In the example shown in FIG. 9, the fuel S 'is supplied into the intermediate mixing chamber 11 from a fuel supply hole 10' opened in the inner peripheral wall of the intermediate mixing chamber 11, but as described above, the intermediate mixing is performed. The intermediate mixing chamber 11 is arranged obliquely with respect to the axis O of the internal mixing chamber 12 so that the opening of the chamber 11 with respect to the internal mixing chamber 12 faces the center of the internal mixing chamber 12, and is provided in the spray medium supply hole 15 ′. A channel 16 for guiding the spray medium V toward the inner peripheral wall of the intermediate mixing chamber 11,
When a spray medium flow restricting member 18 having a cone portion 17 for directing a part of the spray medium V guided into the inside 1 toward the center of the intermediate mixing chamber 11 is fitted, the inner peripheral wall surface of the intermediate mixing chamber 11 From the flow path 16 of the flow restricting member 18 to the intermediate mixing chamber 11
While being protected by the spray medium V guided into the inside, the spray medium V is supplied into the intermediate mixing chamber 11 by the flow of the spray medium V along the cone 17 of the spray medium flow restricting member 18 toward the center of the intermediate mixing chamber 11. Fuel S ′ is supplied to the intermediate mixing chamber 11
Of the intermediate mixing chamber 11 so as to pass through the substantially central part of the intermediate mixing chamber 11 so that it does not flow unevenly in such a manner as to collide with the inner peripheral wall surface of the intermediate mixing chamber 11 facing the fuel supply hole 10 ′. The mixing of the fuel S ′ and the spray medium V in the intermediate mixing chamber 11 is promoted, and the fuel S ′ flows from the intermediate mixing chamber 11 to the center side of the internal mixing chamber 12, and flows along the inner wall of the internal mixing chamber 12. Will not flow
Also in the internal mixing chamber 12, the fuel S 'and the spray medium V are sufficiently mixed, the spraying of the fuel S' is improved, the combustion efficiency is improved, and the NOx is reduced. The inner peripheral wall surface facing the fuel supply hole 10 'does not wear locally.

Thus, also in the example shown in FIG. 9, the fuel S 'and the spray medium V can be sufficiently mixed, the spray of the fuel S' can be improved, the combustion efficiency can be improved, and the NOx can be improved.
Can be reduced, and further, local wear can be suppressed to extend the life.

It should be noted that the fuel injection burner of the present invention is not limited to the illustrated example described above, and it is a matter of course that various changes can be made without departing from the gist of the present invention.

[0057]

As described above, according to the fuel injection burner of the present invention, the fuel and the spray medium can be sufficiently mixed, the fuel spray can be improved, the combustion efficiency can be improved, and NOx can be improved. , And furthermore, it is possible to obtain an excellent effect that local wear can be suppressed to extend the life.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a first example of an embodiment of the present invention, and is a view corresponding to an XI part in FIG.

FIG. 2 is an enlarged sectional view of a main part of a second example of the embodiment of the present invention, and is a view corresponding to the XI part in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part of a modification of the third example of the embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a main part of another modification of the third example of the embodiment of the invention.

FIG. 7 is a sectional view of a fourth embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part of a modification of the fourth example of the embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a main part of another modification of the fourth example of the embodiment of the present invention.

FIG. 10 is a sectional view of a conventional example.

11 is an enlarged cross-sectional view of the XI part of FIG.

FIG. 12 is a sectional view of another conventional example.

FIG. 13 is an enlarged sectional view of a part XIII in FIG. 12;

[Explanation of symbols]

Reference Signs List 10 fuel supply hole 10 'fuel supply hole 11 intermediate mixing chamber 12 internal mixing chamber 13 injection hole 13' injection hole 15 spray medium supply hole 15 'spray medium supply hole 16 flow path 17 cone portion 18 spray medium flow restricting member B fuel Spray medium mixture fluid O axis O ₁ axis O ₁ 'axis O ₂ axis O ₂ ' axis S Fuel S 'Fuel V Spray medium

Claims (6)

[Claims] An injection hole for opening a fuel supply hole on an inner peripheral wall surface and opening a spray medium supply hole at a base end for mixing a fuel and a spray medium and injecting the fuel in a mist state by the pressure of the spray medium. A fuel injection burner comprising: a spray medium supply hole, wherein the axis of the spray medium supply hole is eccentric with respect to the axis of the injection hole toward the inner peripheral wall surface facing the fuel supply hole of the injection hole,
A fuel injection burner wherein a spray medium supply hole is opened at a base end of the injection hole. 2. An injection hole for opening a fuel supply hole on an inner peripheral wall surface and opening a spray medium supply hole at a base end to mix the fuel and the spray medium and inject the fuel in a mist state by the pressure of the spray medium. A fuel injection burner comprising: a spray medium supply hole, a flow path for guiding the spray medium toward the inner peripheral wall of the injection hole, and a part of the spray medium guided from the flow path into the injection hole. A fuel injection burner, characterized in that a spray medium flow restricting member having a cone portion directed toward the center of the spray medium is fitted. 3. An intermediate mixing chamber for mixing a fuel and a spray medium with a fuel supply hole opened on an inner peripheral wall surface and a spray medium supply hole at a base end, and a fuel / spray medium from the intermediate mixing chamber. A fuel injection burner having an internal mixing chamber for remixing the mixed fluid and injecting the mixed fluid from the injection hole, wherein the fuel supply hole is opened in the inner peripheral wall surface of the intermediate mixing chamber on a side far from the axis of the internal mixing chamber. A fuel injection burner characterized by the following. 4. An intermediate mixing chamber for mixing a fuel and a spray medium with a fuel supply hole opening on an inner peripheral wall surface and a spray medium supply hole at a base end, and a fuel / spray medium from the intermediate mixing chamber. A fuel injection burner having an internal mixing chamber for remixing the mixed fluid and injecting the mixed fluid from an injection hole, wherein the opening of the intermediate mixing chamber with respect to the internal mixing chamber faces toward the center of the internal mixing chamber. Wherein the fuel injection burner is disposed obliquely with respect to the axis of the internal mixing chamber. 5. The spray medium supply hole is positioned such that the axis of the spray medium supply hole is eccentric toward the inner peripheral wall facing the fuel supply hole of the intermediate mixing chamber with respect to the axis of the intermediate mixing chamber. 5. The fuel injection burner according to claim 3, wherein the fuel injection burner is opened at a base end of the fuel injection burner. 6. A flow path for guiding a spray medium toward an inner peripheral wall of an intermediate mixing chamber through a spray medium supply hole, and a part of the spray medium guided from the flow path into the intermediate mixing chamber is provided at a central portion of the intermediate mixing chamber. 5. The fuel injection burner according to claim 3, wherein a spray medium flow restricting member having a cone portion facing the fuel injection medium is fitted.