JPH0311540Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention improves the wear resistance of the burner and provides long-term use when spray combustion is performed on highly abrasive fluids such as high-concentration coal-water slurry. The present invention relates to a slurry fuel burner that can be used for.

[Prior Art] As shown in FIG. 3, a conventional slurry fuel burner 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 spray medium supply holes 3 arranged on the circumference of the fuel supply hole 2.
It is equipped with The burner plate 4 includes a fuel distribution chamber 5 that communicates with the fuel supply hole 2 of the burner plug 1 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 distributed fuel and the atomizing medium supplied from the atomizing medium supply hole 3 of the burner plug 1. The burner tip 7 communicates with a plurality of first mixing chambers 6 of the burner plate 4, and has a second second mixing chamber for collecting and further mixing the mixture of fuel and atomizing medium mixed in the first mixing chambers 6. mixing chamber 8 and the second mixing chamber 8
A plurality of nozzle holes 9 are provided at the opposite end of the burner plate 4 to spray the mixture mixed in the burner plate 4 to the outside.

The fuel such as high-concentration coal water slurry and the like that flow into the burner plug 1 from the outside and the atomizing medium such as compressed air are the fuel supply holes 2 of the burner plug 1, respectively.
and the atomizing medium supply hole 3 into the burner plate 4 . In the burner plate 4, 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 flows into the first mixing chamber 6. It is mixed with the spray medium that has flowed into the first mixing chamber 6 and flows into the burner tip 7. In the burner chip 7, the fuel flowing out from the first mixing chamber 6 of the burner plate 4 is collected in a second mixing chamber 8, further mixed, and then sprayed to the outside through a nozzle hole 9 and combusted.

[Problems to be solved by the invention] However, in the above conventional technology, the burner plug 1, the burner plate 4, and the burner tip 7 are each made of the same material, which has strong abrasive properties such as high concentration coal-water slurry. When a fluid is used for spray combustion, the parts that come into contact with the slurry are severely worn, and it is necessary to replace the burner plate 4 and the burner tip 7 every several tens of hours after use.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a slurry fuel burner that has improved wear resistance and can be used for a long time.

[Means for Solving the Problems] The present invention provides a burner plug including a fuel supply hole for supplying slurry fuel and a plurality of atomization medium supply holes for supplying an atomization medium, and the burner plug. a fuel distribution chamber that distributes the fuel supplied from the fuel supply hole of the burner plug; and a fuel distribution chamber that mixes the fuel distributed and supplied from the fuel distribution chamber and the atomization medium that is supplied from the atomization medium supply hole of the burner plug. 1
a burner plate having a mixing chamber; a second mixing chamber for collecting and mixing a mixture of fuel and atomizing medium fed from the first mixing chamber of the burner plate; a burner tip with a plurality of nozzle holes for atomizing a mixture of fuel and atomizing medium to the outside, the fuel distribution chamber of the burner plate and the inner wall of the first mixing chamber and the burner tip A wear-resistant member is removably provided on the inner wall of the second mixing chamber and the nozzle hole to form a slurry fuel burner.

[Function] Therefore, in the present invention, the slurry fuel that is fed from the fuel supply hole of the burner plug to the first mixing chamber via the fuel distribution chamber of the burner plate is transferred from the atomizing medium supply hole of the burner plug to the burner plate. It is mixed with the spray medium fed to the first mixing chamber and fed to the second mixing chamber of the burner chip, where it is further mixed and atomized through the nozzle holes and burned. Since wear-resistant materials are used for the inner walls of the distribution chamber and the first mixing chamber, as well as the inner walls of the second mixing chamber and nozzle hole of the burner tip, the burner can be used even when spraying highly abrasive fluids such as high-concentration coal-water slurry. Inner wall wear is less likely to occur.

[Example] Hereinafter, an example of the present invention will be described based on 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.

The burner plug 1, burner plate 4, and burner tip 7 are made of low alloy steel such as SKD61. Since the fuel distribution chamber 5 of the burner plate 4, the first mixing chamber 6, and the nozzle hole 9 of the burner chip 7 are subject to particularly severe wear, a wear-resistant member made of ceramic such as SiC is used to improve the wear resistance of the inner wall. In order to improve the heat impact resistance of the parts, the wall thickness is 2 to 3 mm.
The fuel distribution chamber block 11a, the first mixing chamber nozzle 11b, and the injection hole nozzle 11c are formed to have a diameter of about 10 to 20 mm and a length of about 10 to 50 mm. In particular, the ceramic wear-resistant member forming the first mixing chamber nozzle 11b of the burner plate 4 and the injection hole nozzle 11c of the burner chip 7 is applied to the base material such as SKD61 from the upstream side in the flow direction of the mixture of slurry and spray medium. It has a tapered surface on the outer periphery in order to fit in and wedge it. Ceramic fuel distribution chamber block 11a, first mixing chamber nozzle 11b,
The injection hole nozzles 11c are removably attached to recesses formed to engage with the base materials of the burner plate 4 and the burner chip 7, respectively, using a ceramic adhesive. Burna Chip 7
In order to protect the second mixing chamber 8 from wear, a hard metal wear-resistant ring 12a is attached to the cylindrical portion of the inner wall of the second mixing chamber 8, and a truncated conical portion of the inner wall of the second mixing chamber 8 is attached to the cylindrical portion of the inner wall of the second mixing chamber 8. Ceramic injection hole nozzle 11c
A wear-resistant plate 12b made of a hard alloy and having a plurality of holes having the same shape as the large diameter portion of the outer periphery of the ceramic nozzle nozzle 11c is fitted so that the nozzle 11c can be fitted therein. Since both the hard metal wear ring 12a and the hard metal wear plate 12b are made of metal materials, thermal shock resistance can be maintained even if the wall thickness is increased. When the burner plug 1, burner plate 4, and burner tip 7 are fixed with the tip nut 10, a wear-resistant ring 12a made of hard metal is attached.
is fixed in the burner chip 7 by having one end pressed by the burner plate 4 and the other end being pressed by a hard metal wear-resistant plate 12b fixed to the burner chip 7 using a set screw 13.

The structure of the other parts is the same as the burner shown in FIG. 3.

When slurry is spray-combusted by a slurry fuel burner having such a configuration, the inner walls of the fuel distribution chamber block 11a and the first mixing chamber nozzle 11b of the burner plate 4, which are the most worn, and the inner wall of the nozzle nozzle 11c of the burner tip 7 are made of ceramic. Since it is made of wear-resistant material, wear is less likely to occur. In addition, when wear progresses due to long-term use, the ceramic wear-resistant member should be replaced.

Next, the inner wall of the second mixing chamber 8, which is subject to severe wear, is protected from wear by being fitted with a hard alloy wear-resistant ring 12a and a hard alloy wear-resistant plate 12b, so that the inner wall of the mixing chamber 8 is also not easily worn. . Further, the wear-resistant ring 12a made of hard alloy and the wear-resistant plate 12a made of hard alloy are replaced when wear progresses. Furthermore, by adjusting the wall thickness, etc., the replacement period can be matched to that of the ceramic wear-resistant member.

FIG. 2 is an explanatory diagram of another embodiment of the present invention, in which the holes drilled in the wear-resistant plate 12b made of hard alloy have the same diameter as the nozzle holes 9, and the nozzles 1 are made of ceramic.
A wear-resistant plate made of a hard alloy is fitted so as to press 1c from inside the second mixing chamber 8.
With such a configuration, the life of the nozzle holes etc. can be extended as described above.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it is also possible to replace the material of each device with another material having the same type of function, and other modifications may be made without departing from the gist of the present invention. Of course, various changes can be made.

[Effects of the invention] As described above, according to the slurry fuel burner of the invention, the wear of the parts that come into contact with the slurry can be reduced, and the wear-resistant member made of ceramic and the wear-resistant ring made of hard alloy can be reduced. By replacing the wear-resistant plate made of hard alloy, various types of excellent hardening can be achieved, such as realizing the demand for an economical slurry fuel burner that can be used for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, FIG. 2 is an explanatory diagram of another embodiment of the present invention, and FIG. 3 is an explanatory diagram of a conventional example. In the figure, 11 is a wear-resistant member made of ceramic, 11a is a fuel distribution chamber block, 11b is a first mixing chamber nozzle, 11c is a jet nozzle, 12a is a wear-resistant ring made of hard alloy, and 12b is a wear-resistant plate made of hard alloy. show.

Claims (1)

[Scope of utility model registration request] A burner plug including a fuel supply hole for supplying slurry fuel and a plurality of atomization medium supply holes for supplying an atomization medium, and a fuel for distributing the fuel supplied from the fuel supply hole of the burner plug. a burner plate comprising a distribution chamber and a first mixing chamber that mixes the fuel distributed and supplied from the fuel distribution chamber and the atomization medium supplied from the atomization medium supply hole of the burner plug; and the burner plate. a second mixing chamber for collecting and mixing the mixture of fuel and atomizing medium fed from the first mixing chamber;
a burner tip having a plurality of nozzle holes for atomizing a mixture of fuel and atomizing medium mixed in a mixing chamber to the outside, the fuel distribution chamber of the burner plate and the first mixing chamber; A burner for slurry fuel, characterized in that a wear-resistant member is removably provided on the inner wall of the burner chip, the second mixing chamber of the burner chip, and the inner wall of the nozzle hole.