JPH0490408A - Burner for slurry fuel - Google Patents

Abstract

PURPOSE:To reduce the abrasion of the inner surface of a burner tip, and to prevent the generation of coarse particles during atomizing by installing each first mixing chamber in the inward oblique direction so that extensions in the direction of injection of each first mixing chamber are crossed in a second mixing chamber. CONSTITUTION:Slurry-like fuel fed to a first mixing chamber 6 through the fuel distributing chamber 5 of a burner plate 4 from the fuel feed hole 2 of a burner plug 1 is mixed with an atomizing medium supplied to the first mixing chamber 6 of the burner plate 4 from the atomizing-medium feed hole 3 of the burner plug 1 and fed to the second mixing chamber 8 of a burner tip, and further mixed in the second mixing chamber 8 and atomized from a nozzle hole 9 and burnt. A mixture injected from a plurality of the first mixing chambers 6 is crossed in the second mixing chamber 8. Consequently, the mixture violently collides in the second mixing chamber 8 and is dispersed uniformly, is mixed sufficiently, and is ejected from the nozzle hole 9. In this case, abrasion of the burner tip 7 is reduced remarkably, and atomizing concentration is equalized. The generation of coarse particles during atomizing is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a burner for use with slurry fuel such as coal water slurry (CWM).

[Prior art] Conventional slurry fuel burners (for example, Utility Model No. 62-20
No. 4133), as shown in FIG. 3, has a structure in which a burner plug 1, a burner plate 4, and a burner tip 7 are fixed from the outer periphery with a tip nut 10. The burner plug 1 includes a fuel supply hole 2 in the center and a plurality of atomizing medium supply holes 3 arranged around the circumference of the fuel supply hole 2. The burner plate 4 is connected to the burner plug 1.
a fuel distribution chamber 5 that communicates with the fuel supply hole 2 and has a flow path for distributing the fuel supplied from the fuel supply hole 2; A plurality of first mixing chambers 6 are provided for mixing the atomizing medium supplied from the atomizing medium supply hole 3 of the burner plug 1. The burner chip 7 is connected to the burner plate 4
a second mixing chamber 8 that communicates with the plurality of first mixing chambers 6 and collects and further mixes the mixture of fuel and spray medium mixed in the first mixing chambers 6; said burner plate 4 for spraying the mixture mixed in the chamber 8 to the outside;
A plurality of nozzle holes 9 are provided at the opposite end of the nozzle hole 9 .

Fuel such as a highly concentrated coal-water slurry and a spray medium such as compressed air that flow into the burner plug 1 from the outside flow into the burner plate 4 which passes through the fuel supply hole 2 and the spray medium supply hole 3 of the burner plug 1, respectively. do. The burner plate 4
Then, the fuel flowing from the fuel supply hole 2 is distributed from the flow path of the fuel distribution chamber 5 toward the first mixing chamber 6, and the distributed fuel passes through the atomization medium supply hole 3 and enters the first mixing chamber. It mixes with the atomizing medium that has flowed into 6 and flows into burner chip 7 . In the burner chip 7, the fuel flowing out from the first mixing chamber 6 of the burner plate 4 is collected in the second mixing chamber 8, further mixed, and then sprayed to the outside through the nozzle hole 9 and burned.

Incidentally, since the high concentration coal water slurry has strong abrasive properties, the burner plate 4 and the burner tip 7 are equipped with wear-resistant members.

[Problems to be Solved by the Invention] In the conventional slurry fuel burner shown in FIG. There was a problem in that the inner surface of the tip 7 (particularly around the nozzle hole 9) was easily worn out because of the collision.

Further, in the conventional slurry fuel burner described above, a part of the mixture ejected from the first mixing chamber 6 into the second mixing chamber 8 is ejected as it is from the nozzle hole 9, and the remainder of the mixture is ejected from the inner surface of the burner chip 7. collide with For this reason, mixing within the second mixing chamber 8 is insufficient, resulting in uneven spray concentration. Furthermore, since the slurry flowing along the inner wall of the second mixing chamber 8 is not sufficiently stirred, it is directly ejected from the nozzle hole 9, producing coarse particles.

[Means for Solving the Problems] The slurry fuel burner of the present invention includes a burner plug equipped with a fuel supply hole for supplying slurry fuel and a plurality of atomization medium supply holes for supplying an atomization medium. , a fuel distribution chamber for distributing the fuel supplied from the fuel supply hole of the burner plug, and the fuel distributed and supplied from the fuel distribution chamber and the fuel supplied from the atomizing medium supply hole of the burner plug. a burner plate having a plurality of first mixing chambers for mixing the fuel and the atomizing medium; and a 's2 mixing chamber for collecting and mixing the mixture of the fuel and the atomizing medium fed from the first mixing chamber of the burner plate. between the burner plate and the burner chip, the burner chip having a plurality of nozzle holes for atomizing the mixture of fuel and atomizing medium mixed in the second mixing chamber to the outside. In the slurry fuel burner, each of the first and second mixing chambers is arranged such that the extension line in the ejection direction of each of the first and second mixing chambers intersects inside the second mixing chamber.
This device is characterized in that the mixing chamber is provided diagonally inward.

[Operation] In the slurry fuel burner of the present invention, the first
The slurry-like fuel fed to the mixing chamber is mixed with the atomizing medium fed from the atomizing medium supply hole of the burner plug to the first mixing chamber of the burner plate, and is then fed to the second mixing chamber of the burner chip. The mixture is further mixed in the second mixing chamber, sprayed from the nozzle hole, and combusted. The mixtures ejected from the plurality of first mixing chambers intersect within this 'tS2 mixing chamber. Therefore, the mixture collides violently in the second mixing chamber, is evenly dispersed, and is jetted out from the nozzle hole after being sufficiently mixed.

In this case, the mixture ejected from the first mixing chamber is mixed into the second mixing chamber.
Since they collide with each other in the mixing chamber and are evenly distributed, they impinge on the inner surface of the burner tip at a lower velocity than when ejected from the first mixing chamber, which significantly reduces wear on the burner tip.

Furthermore, since the second mixing chamber is sufficiently mixed, the aitrs concentration becomes uniform.

Furthermore, since a vigorous stirring action occurs in the second mixing chamber, the slurry flowing along the inner wall of the second mixing chamber is sufficiently sheared into a thin film, thereby preventing the generation of coarse particles in 17J8.

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

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and the same parts as in FIG. 3 are given the same reference numerals.

In this embodiment, a total of six first mixing chambers 6 are provided in the burner plate 4 at equal positions in the circumferential direction. These first mixing chambers 6 extend obliquely inward toward the second mixing chamber 8 , and the extension lines of the first mixing chambers 6 intersect within the second mixing chamber 8 . In this example, in order to ensure sufficient dispersion, mixing, and stirring area, this intersection point C
The position of is the distance 1142 between C and the tip surface of the burner tip 7.
A/L is 0.5 with respect to the internal length of burner tip 7.
Preferably, the value is between 0.8 and 0.8.

A total of eight nozzle holes 9 are provided in the burner chip 7 at equal positions in the circumferential direction.

In addition, in this embodiment, the burner plug 1 is the central pipe member IA.
and an outer tube member IB. A flange portion 1a is provided on the distal end side of the central tube member IA, and this flange portion 1a is overlapped with the burner plate 4. A conduit 12 is provided in the fuel supply hole 2 in the central tube member IA.
CWM is supplied from the central tube member IA and the outer tube member IB.
Steam is supplied to the spray medium supply hole 3 between.

In the embodiment shown in FIG. 1, a portion of the first mixing chamber 6 on the upstream side of the guide hole 5a has a small diameter, and a portion on the second mixing chamber 8 side has a larger diameter.

The other configurations are the same as in FIG. 3 except for the presence or absence of wear-resistant members.

In the slurry fuel burner configured in this way, the slurry fuel fed from the fuel supply hole 2 of the burner plug 1 to the first mixing chamber 6 via the fuel distribution chamber 5 of the burner plate 4 is The gIN medium is mixed with the gIN medium fed from the spray medium supply hole 3 of No. 1 to the first mixing chamber 6 of the burner plate 4, and is fed to the second mixing chamber 8 of the burner chip, where it is further mixed. It is sprayed from the nozzle hole 9 and burned. Thus, the mixtures ejected from the plurality of first mixing chambers 6 intersect within this second mixing chamber 8. Therefore, the mixture collides violently in the TS2 mixing chamber 8 and is evenly dispersed, and after being sufficiently mixed, it is ejected from the nozzle hole 9.

In this case, the mixtures ejected from the first mixing chamber 6 collide with each other in the second mixing chamber 8 and are evenly dispersed, so the speed is lower than the speed when ejected from the first mixing chamber 6. Since the burner tip 7 collides with the inner surface of the burner tip 7, wear of the burner tip 7 is significantly reduced.

Furthermore, since sufficient mixing occurs in the second mixing chamber 8, the spray concentration becomes uniform.

Furthermore, in the '=2 mixing chamber 8, as shown in FIG. Since the slurry flowing through is sufficiently sheared into an i-film, generation of coarse particles during spraying is prevented.

In addition, in the present invention, in addition to the burner tip 7, which is prone to wear, it is preferable that the burner plate 4 and the like are also formed of a wear-resistant member made of ceramic (for example, silicon nitride).

In the present invention, it is preferable to send water, steam, or air to the fuel supply hole 2 to purge the residue after combustion of the slurry fuel burner is stopped.

[Effects] As described above, according to the slurry fuel burner of the present invention,
The ejected mixtures from the plurality of first mixing chambers collide and are evenly dispersed in the second mixing chamber, resulting in more thorough mixing.

In addition, the collision speed of the ejected mixture from the first mixing chamber with the inner surface of the second mixing chamber (inner surface of the burner chip) is reduced, and the mixture is sufficiently mixed within the second mixing chamber. Internal wear is significantly reduced, and
Spray concentration bias is reduced. Furthermore, according to the invention:
Since the slurry flowing along the inner wall of the S2 mixing chamber is sufficiently sheared into a thin film, generation of coarse particles during spraying is prevented.

[Brief explanation of drawings]

FIG. 341 is a sectional view of the slurry fuel burner according to the embodiment, FIG. 2 is an explanatory view of the same operation, and FIG. 3 is a sectional view of the conventional slurry fuel burner. 1... Burner plug, 2... Fuel supply hole, 3...
... Spray medium supply hole, 4... Burner plate, 6...
- First mixing chamber, 7... Burner chip, 8... Second mixing chamber, 9... Nozzle hole.

Claims (1)

[Claims] (1) A burner plug equipped with a fuel supply hole for supplying slurry-like fuel and a plurality of atomization medium supply holes for supplying an atomization medium; The burner plug includes a fuel distribution chamber for distributing the fuel, and a plurality of first mixing chambers for mixing the fuel distributed and supplied from the fuel distribution chamber with the atomization medium supplied from the atomization medium supply hole of the burner plug. a second mixing chamber for collecting and mixing the mixture of fuel and atomizing medium fed from the first mixing chamber of the burner plate; A burner chip for slurry fuel comprising: a burner chip having a plurality of nozzle holes for atomizing the mixture of fuel and atomization medium mixed in the second mixing chamber to the outside; and a jetting direction of each first mixing chamber. A slurry fuel burner characterized in that each of the first mixing chambers is provided diagonally inward so that an extension line of the first mixing chamber intersects inside the second mixing chamber.