JP2002168413A - Burner - Google Patents

Abstract

(57) [Problem] To provide a burner capable of promoting atomization of fuel to improve spray performance and suppressing generation of NOx and dust. A spray medium space to which a spray medium is supplied.
A fuel space 19 located on the outer peripheral side of the spray medium space 18 to which fuel is supplied, and a radial angle at a required angle with respect to the axis so that the spray medium supplied to the spray medium space 18 is introduced. The plurality of injection holes 20 extending to
And a burner tip 22 having a fuel supply hole 21 which communicates with the fuel space 19 and communicates with the fuel injection hole 20 at an intermediate position, so that the spray medium supplied to the spray medium space 18 is introduced axially. On the other hand, a plurality of spray medium injection holes 24 extending radially at a required angle and opening at the tip are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a burner.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a burner apparatus used for a boiler. A burner throat 2 formed on a boiler furnace wall 1 is provided with a liquid fuel such as a heavy oil or an orimulsion and steam or air. An ignition torch 4 for injecting and burning an ignition fuel such as light oil in a mist form by using a spray medium such as steam or air; An ignition plug 5 for igniting an ignition torch 4 is provided so as to be able to be inserted into and removed from an insertion tube 6 provided near the burner 3.

In FIG. 4, reference numeral 7 denotes secondary air for combustion, and reference numeral 8 denotes a register vane for applying a swirling force to the secondary air 7.

As shown in FIGS. 5 to 8, the burner 3 is generally provided with a fuel supply passage 9 for a liquid fuel such as heavy oil and an orimulsion and a spray medium supply passage 10 for a vapor or the like. At the tip of a cylindrical burner main body 11, a nozzle body 14 is formed in which a fuel flow path 12 communicating with the fuel supply flow path 9 and a spray medium flow path 13 communicating with the spray medium supply flow path 10 are formed. At the tip of the nozzle body 14,
A fuel orifice portion 15 communicating with the fuel flow path 12,
An orifice plate 17 having a spray medium passage hole 16 communicating with the spray medium flow path 13 is provided. At the tip of the orifice plate 17, the spray medium communicates with the spray medium passage hole 16 so that the spray medium passes therethrough. A spray medium space 18 to be supplied, a fuel space 19 which is located on the outer peripheral side of the spray medium space 18 and is supplied with fuel in communication with the fuel orifice portion 15, and a spray medium supplied to the spray medium space 18 A plurality of injection holes 20 extending radially at a required angle with respect to the axial center so as to be introduced, and opening at the tip end, and a fuel supply hole communicating with the fuel space 19 and leading to a middle position of the injection hole 20 21 and a burner chip 22 having
The orifice plate 17 and the burner chip 22 are
It has a configuration fixed to the nozzle body 14 by a tip nut 23 screwed to the nozzle body 14.

In the burner device as described above, as shown in FIG. 4, first, the ignition torch 4 and the ignition plug 5 are inserted into the insertion tube 6, and the tip of the ignition torch 4 and the ignition plug 5 are inserted into the insertion tube. 6, while projecting from the tip opening of the burner 3 and positioned near the tip of the burner 3, the ignition fuel and the spray medium are guided to the ignition torch 4 to mix and inject them, and the ignition plug 5 ignites. The fuel and the spray medium are guided to the burner 3 to be mixed and injected, and the burner 3 is ignited by using the flame of the ignition torch 4 as an ignition source.

In the case of the burner 3, as shown in FIG. 5, the spray medium is supplied from the spray medium supply flow path 10 to the spray medium space 18 of the burner chip 22 through the spray medium flow path 13 and the spray medium passage hole 16. Then, the fuel is guided from the spray medium space 18 to the injection holes 20, and the fuel is supplied from the fuel supply passage 9 to the fuel space 19 of the burner chip 22 through the fuel passage 12 and the fuel orifice portion 15. From the fuel supply hole 21 to the injection hole 20, the spray medium and the fuel are mixed in the injection hole 20, and the fuel is injected from the injection hole 20 in the form of a mist by the pressure of the spray medium. It is ignited by the flame of the torch 4 and burns.

When the burner 3 is ignited and the combustion of the fuel is started, the supply of the ignition fuel and the spray medium to the ignition torch 4 is stopped, and after the ignition torch 4 is extinguished, the ignition torch 4 and the ignition The plug 5 is pulled out from the insertion tube 6 so that the combustion by the burner 3 is continued.

[0008]

However, in the conventional burner 3 as described above, the injection hole 2 of the burner chip 22 is not provided.
Since the fuel is simply introduced from the fuel supply hole 21 into the injection hole 20 to be merged and injected into the spray medium that travels straight through the inside of the nozzle 0, the fuel is sprayed without being uniformly distributed at the outlet of the injection hole 20. In addition, fuel having a relatively large spray particle diameter is unevenly distributed, and it is difficult to maintain a good spray particle diameter of the fuel, leading to an increase in NOx and dust.

The present invention has been made in view of the above circumstances, and has as its object to provide a burner capable of promoting atomization of fuel to improve spray performance and suppressing generation of NOx and dust.

[0010]

SUMMARY OF THE INVENTION The present invention provides a spray medium space to which a spray medium is supplied, a fuel space which is located on an outer peripheral side of the spray medium space and is supplied with fuel, and a fuel medium which is supplied to the spray medium space. A plurality of injection holes extending radially at a required angle with respect to the axis so as to introduce the sprayed medium and opening at the tip, and a fuel supply communicating with the fuel space and leading to a middle position of the injection hole A burner tip having a plurality of spray medium injection holes extending radially at a required angle with respect to the axis so as to introduce the spray medium supplied to the spray medium space and opening at the tip end. The present invention relates to a burner.

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

In the case of the burner of the present invention, the spray medium supplied to the spray medium space of the burner chip is guided to the injection hole, and the fuel supplied to the fuel space of the burner chip is
The fuel is guided to the injection hole, whereby the spray medium and the fuel are mixed in the injection hole, and the fuel is injected in the form of a mist from the injection hole by the pressure of the spray medium. A part of the medium is ejected from the spray medium ejection hole,
Combustion takes place.

As a result, unlike a conventional burner, unlike a conventional burner, in which fuel is simply guided from a fuel supply hole into a fuel injection hole into a fuel injection hole and merged with the spray medium which is straight ahead, the fuel is sprayed. The flame temperature is lowered by the spray medium injected from the medium injection hole, and the spray medium injected from the spray medium injection hole collides with the fuel injected from the injection hole, promoting further miniaturization of the fuel mist. As a result, the fuel having a large spray particle diameter is not unevenly distributed, it is possible to maintain a good spray particle diameter of the fuel, and it becomes difficult to generate NOx and dust.

[0014]

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

FIGS. 1 to 3 show an example of an embodiment of the present invention. In the drawings, portions denoted by the same reference numerals as those in FIGS. 4 to 8 represent the same components. This embodiment is similar to the conventional one shown in FIGS. 4 to 8, but is characterized by a spray medium space 18 to which a spray medium is supplied and a spray medium as shown in FIGS. 1 to 3. A fuel space 19 which is located on the outer peripheral side of the space 18 and is supplied with fuel, and which extends radially at a required angle with respect to the axis so that the spray medium supplied to the spray medium space 18 is introduced; The spray medium supplied to the spray medium space 18 is provided to a burner tip 22 having a plurality of injection holes 20 opening to the fuel chamber 19 and a fuel supply hole 21 communicating with the fuel space 19 and communicating with a middle position of the injection hole 20. Radially extending at the required angle to the axis so that Lies in bored a plurality of atomizing medium injection hole 24 which is open at the distal end portion Te.

In the illustrated example, the spray medium injection holes 24
Are arranged on the inner peripheral side of the plurality of injection holes 20 arranged in the circumferential direction of the burner chip 22.

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

A burner chip 22 as shown in FIGS.
Is applied to the burner 3 as shown in FIG. 5, the spray medium is supplied from the spray medium supply channel 10 to the spray medium space 18 of the burner chip 22 through the spray medium channel 13 and the spray medium passage hole 16. The spray medium supplied to the spray medium space 18 is guided to the injection hole 20, and the fuel flows from the fuel supply passage 9 to the fuel space 19 of the burner chip 22 via the fuel passage 12 and the fuel orifice portion 15. The fuel supplied and supplied to the fuel space 19 is guided to the injection hole 20, whereby the spray medium and the fuel are mixed in the injection hole 20, and the fuel is discharged from the injection hole 20 by the pressure of the spray medium. The spray medium is sprayed in a mist, and a part of the spray medium supplied to the spray medium space 18 is sprayed from the spray medium injection holes 24 to perform combustion.

As a result, as with the conventional burner 3, the fuel is simply guided from the fuel supply hole 21 into the injection hole 20 to be injected into the spray medium that travels straight through the injection hole 20 of the burner chip 22. Unlike the spray medium injection holes 24
The flame temperature is lowered by the spray medium injected from the nozzle, and the spray medium injected from the spray medium injection hole 24 collides with the fuel injected from the injection hole 20, thereby further miniaturizing the fuel mist. In addition, a fuel having a large spray particle diameter is not unevenly distributed, and a good spray particle diameter of the fuel can be maintained, so that NOx and dust are less likely to be generated.

Thus, atomization of fuel can be promoted to improve the spraying performance, and the generation of NOx and dust can be suppressed.

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

[0022]

As described above, according to the burner of the present invention, atomization of fuel can be promoted to improve the spraying performance.
An excellent effect of suppressing generation of NOx and dust can be obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a burner chip according to an example of an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is an overall schematic configuration diagram illustrating an example of a burner device used in a boiler.

FIG. 5 is a side sectional view showing an example of a conventional burner, and is an enlarged sectional equivalent view of a V part in FIG. 4;

FIG. 6 is a side sectional view of a burner chip in an example of a conventional burner.

FIG. 7 is a view taken along the line VII-VII in FIG. 6;

8 is a view taken in the direction of arrows VIII-VIII in FIG. 6;

[Explanation of symbols]

 3 Burner 18 Spray medium space 19 Fuel space 20 Injection hole 21 Fuel supply hole 22 Burner chip 24 Spray medium injection hole

Claims (1)

[Claims] A spray medium space to which a spray medium is supplied;
A fuel space which is located on the outer peripheral side of the spray medium space and to which fuel is supplied, and which extends radially at a required angle with respect to an axis so that the spray medium supplied to the spray medium space is introduced; A plurality of injection holes, and a fuel supply hole communicating with the fuel space and leading to a middle position of the injection hole,
A burner tip having a plurality of spray medium ejection holes extending radially at a required angle with respect to an axis so as to introduce the spray medium supplied to the spray medium space and opening at a tip end. And burner.