JPH0311539Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a burner for slurry fuel.

[Conventional technology] In recent years, there has been a tendency for coal to be reconsidered as an energy resource among fossil fuels. Slurry fuel, which is made by pulverizing coal into fine particles and suspending them in water, oil, methanol, etc., is being used. It is becoming more and more common.

In the atomizer for the slurry fuel burner, the inner surface of the slurry nozzle hole is severely worn, and in the case of the alloy tool steel used in a normal oil fuel atomizer, the life is only about 10 hours, making it impractical.

To prevent this wear, conventionally, silicon carbide (SiC), which is a wear-resistant material, is used in the nozzle hole part a, as shown in Figure 3.
Insert and fit sleeves b, c or bushes made of ceramics such as silicon nitride (Si ₃ N ₄ ),
It is fixed to a metal plate d using an inorganic adhesive.

The ceramic sleeve b and the like can reduce wear on the inner surface of the slurry nozzle hole.

[Problems to be solved by the invention] However, the gap between the inner surfaces of the holes in sleeve b and plate d is about 0.1 mm, and the particle size of the inorganic adhesive is about 0.01 mm.
~0.03 mm, and several layers of adhesive particles are formed in the gap, but since the adhesive layer is soluble in steam or hot water of 100°C or higher, it is not possible to feed it from the spray medium supply hole f of plug e. It melts due to the supplied spraying steam, causing the sleeve b to wobble, resulting in a problem.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention provides a plug having a plurality of atomizing medium supply holes around the slurry fuel supply hole, a second mixing chamber, and a second mixing chamber. and a chip having spray holes, the same number of first mixing chambers as the number of spray medium supply holes are in communication with each of the spray medium supply holes of the plug, and slurry fuel is supplied from the slurry fuel supply holes to each of the first mixing chambers. The burner was constructed by interposing a ceramic plate having a slurry fuel inlet hole for introducing the slurry fuel.

[Operation] The spray vapor supplied from the spray medium supply hole of the plug enters the first mixing chamber of the ceramic plate, and mixes with the slurry fuel from the slurry fuel introduction hole.
Next is mixed.

Since the sprayed steam does not come into contact with the ceramic joint, there is no risk of rattling or coming off.

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

FIG. 1 shows an embodiment of the present invention, in which 1 is a plug, 2 is a slurry fuel supply hole, 3 is a spray medium supply hole, 4 is a chip, 5 is a ceramic sleeve, 6 is an adhesive layer, and 7 is a It is a spray hole and plug 1
A plate 8 made of ceramic such as SiC or Si ₃ N ₄ is interposed between the chip 4 and the chip 4 .

A branch chamber 9 is provided in the center of the plug 1 side end of the plate 8, and first mixing chambers 10 of the same number as the spray medium supply holes 3 are bored around the branch chamber 9. The end of the chamber 10 on the side of the plug 1 is constricted to form a spray medium inlet 11, and furthermore, a slurry fuel introduction hole 12 is provided for communicating between the branch chamber 9 and each first mixing chamber 10.
are perforated in each case. Furthermore, a hollow portion 13 is provided at the center of the end of the plate 8 on the side of the chip 4 to make the plate 8 as thin as possible.

With the above structure, the plate 8 is integrally formed of ceramics, so that the atomizing steam of 100° C. or higher supplied from the atomizing medium supply hole 3 of the plug 1 reaches the atomizing medium inlet 1 of the plate 8.
When entering the first mixing chamber 10 from the first mixing chamber 10, there is no contact with the joints of the ceramics.

Therefore, a burner having this plate can be used stably for a long time.

FIG. 2 is an explanatory diagram of another embodiment of the present invention,
In substantially the same configuration as the embodiment described above, the flow dividing chamber body 1
4 and the plate body 15 are constructed separately from ceramics, and are bonded with an inorganic adhesive with the respective slurry fuel introduction holes 16 and 17 communicating with each other. The outer diameter of the branch chamber 9' is smaller than the inscribed circle of each spray medium supply hole 13 arranged on the same circumference.

In the case of this embodiment, the spray medium supplied from the spray medium supply hole 3 comes into direct contact with the adhesive part because the space between the plate 8' and the plug 1 is highly airtight due to the high sealing finish. Of course, indirect contact can also be prevented. Therefore, the inorganic adhesive at the bonded portion is not melted by the high-temperature sprayed steam, so that the diversion chamber body 14 will not wobble.

In each of the above embodiments, since the hollow part 13 is provided and the whole is made thin, the thermal shock resistance is high.
It is hard to break and has a long life.

Incidentally, the burner of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the invention] As explained above, according to the burner of the invention,
Various excellent effects can be achieved as described below.

() Since the plate is made of ceramics, the high-temperature atomizing steam supplied from the atomizing medium supply hole of the plug immediately enters the first mixing chamber.
Do not come into contact with the adhesive layer. Therefore, the conventional problems such as rattling and coming off of the ceramic sleeve are completely eliminated.

() It has high hardness and high thermal shock resistance, so it has a long life.

() It is relatively easy to mold, and only the contact surface with the plug and chip needs to be processed, so it is inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a partial explanatory diagram of one embodiment of the burner of the present invention, FIG. 2 is a partial explanatory diagram of another embodiment of the burner of the present invention, and FIG. 3 is an explanatory diagram showing an example of a conventional burner. . 1 is a plug, 2 is a slurry fuel supply hole, 3 is a spray medium supply hole, 4 is a tip, 8, 8' is a plate,
9 is a branching chamber, 10 is a first mixing chamber, 12, 16, 1
7 is a slurry fuel introduction hole, 13 is a hollow part, 14 is a branch chamber body, and 15 is a plate body.

Claims (1)

[Scope of utility model registration request] Between a plug having a plurality of atomizing medium supply holes drilled around the slurry fuel supply hole and a chip having a second mixing chamber and a spray hole, the atomizing medium supply hole can communicate with each atomizing medium supply hole of the plug. the same number of first
A burner comprising a ceramic plate having a mixing chamber and a slurry fuel introduction hole for guiding slurry fuel from the slurry fuel supply hole to each of the first mixing chambers.