JPS58198612A - Fuel atomizer - Google Patents

Abstract

PURPOSE:To reduce the abrasion of a fluid mixture passage by a method wherein an atomized medium pipe is coaxially inserted into the fluid mixture passage so as to communicate with an atomized medium passage or a fuel passage and the distance between the nozzle of the atomized medium pipe and the nozzle of the fluid mixture passage is determined to be in the order of zero to the diameter of the latter. CONSTITUTION:A plurality of the atomized medium pipes 24 are provided radially from an atomized medium distribution passage 23 provided in the center of the rear end of the atomizer 20 and the atomized medium passage 26 is provided within each of the atomized medium pipes 24. Further, an annular fuel pool 21 provided at the rear end of the atomizer 20 is made to communicate with a shield pipe 27 for the atomized medium pipe 24 through the fuel passage 22 and then with a fuel-atomized medium mixture passage 25. In this case, the distance between the tip of the nozzle of the atomized medium pipe 24 and the tip of the nozzle of the passage 25 is determined to be in the order of zero to the diameter (d) of the passage 25. As a consequence, even if a slurry fuel is separated into a fuel oil and solid particles, there is no danger of the solid particles running against, or sliding with, the inner wall of the fuel-atomized medium mixture passage 25.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a fuel spray atomizer that uses a two-fluid spray atomizer to spray slurry fuel containing solid particles.

Main parts of a two-fluid ash atomizer that has been commonly used are shown in FIGS. 1 to 5. In the figure, 01 is the atomizer main body, 02 is a fuel reservoir, 03 is a fuel passage, 04 is an atomizing medium distribution passage, and 05 is a fuel mixing passage. Further, arrow AO3 indicates the flow of fuel, and arrow AO5 indicates the flow of the atomizing medium.

In the atomizer with the above structure, the fuel is stored in a fuel reservoir of 0.
2 to a plurality of fuel passages 03. On the other hand, the atomizing medium (e.g. steam) is injected into the fuel mixing path 05 through the atomizing medium distribution path 04, and collides with the fuel, mixes, and
Stirred. At this time, the fuel is atomized by the energy of the spray medium and injected into the furnace from the fuel mixing passage 05.

In this type of two-fluid spray atomizer, since the fuel density is about 1000 times the density of the spray medium, the spray medium is released in the fuel mixing passage 05 and flows into the fuel mixing passage 05 on the opposite side of the fuel passage 03. collide.

Therefore, as shown by the broken arrow mAo3 in FIG. 4, the fuel collides with the inner wall of the fuel mixing passage 05.

When the above-mentioned two-fluid NX fine atomizer is applied to slurry-like liquid fuel, since the slurry-like liquid fuel contains solid particles, when the fuel flows while colliding with the wall surface of the fuel mixing passage 05, it is already l'Jt mist medium. The solid particles atomized and separated from the fuel oil flow while colliding or sliding on the wall surface of the fuel mixing passage 05 along with the commercial flow of the atomizing medium, so that the inner wall of the fuel mixing passage 05 flows as shown in FIGS. As shown by the hunting in the figure, this wear enlarges the hole in the fuel mixing passage 05, and as a result, it affects the flow rate characteristics of the atomizer, making it impossible to perform its function as an atomizer. There was a problem that required replacement.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fuel spray atomizer that overcomes the above-mentioned drawbacks, has high combustion efficiency, and can withstand long-term use.

The present invention provides a fuel system comprising a plurality of mixed fluid passages that open at intervals in the circumferential direction of the front end face of an atomizer main body, and a plurality of @Wj medium passages and fuel passages that are communicated with each of the mixed fluid passages. In the spray atomizer, the spray medium pipe or In the atomizer, an axial distance between an ejection port of the fuel pipe to the mixed fluid passage and an injection port of the mixed fluid passage ranges from zero to a diameter of the injection port of the mixed fluid passage.

According to the invention, therefore, the fuel in the mixing passage.

Even if the liquid fuel oil and solid particles are separated by the atomizing medium in the mixing passage, there is almost no axial distance between the jet port of the fuel pipe or the atomizing medium pipe and the jet port of the mixing passage. As shown in FIG.

Therefore, since there is no need to use a superhard material from the mixing section of the fuel and atomizing medium in the mixing passage to the injection port, it is possible to provide an atomizer with a simple structure and less wear and tear.

The present invention will be explained with reference to the embodiments shown in the accompanying drawings.
In FIG. 7, a spray medium distribution passage 23 is provided at the center of the rear end of the atomizer body 20, a large number of spray medium pipes 24 are provided radially in the spray medium distribution passage 23, and a spray medium is disposed inside the spray medium pipes 24. A passage 26 is provided. Further, an annular fuel reservoir 21 is provided outside the distribution passage 23 at the rear end of the atomizer body 20, and the fuel reservoir 21 communicates with the cladding tube 27 of the atomizing medium pipe 24 via the fuel passage 22, so that the atomizing medium pipe is A fuel/spray medium mixed fluid passage (hereinafter referred to as mixed fluid passage) 25 is formed at the tip end, which joins the cladding tube 27 .

Further, arrow A22 indicates the flow of fuel, and arrow A26 indicates the flow of the spray medium.

Note that l indicates the axial distance between the tip jet port of the spray medium pipe 24 and the jet port of the mixed fluid passage 25, and its value is between approximately zero and the diameter d of the jet port of the mixed fluid passage 25. .

(Function) In the atomizer having the above structure, fuel flows from the fuel reservoir 21 as shown by arrow A22 (fuel passage 22, cladding tube 27,
The mixed fluid is injected through the mixed fluid passageway 25.

On the other hand, the spray medium is sprayed and supplied from the spray medium distribution passage 23 to the mixed fluid passage 25 through the spray medium passage 26 as shown by arrow A26. Under such operating conditions, the spray medium is injected from the fuel passage 22 into the mixed fluid passage 25. The fuel collides with the spray medium that has passed through the cladding tube 27, and is atomized while being mixed and stirred.
The mixed fluid is injected into the furnace from the mixed fluid passage 25.

Fuel indicated by arrow A22 and arrow A26 in FIG.
Since both of the spray fluids indicated by 2 flow straight through the mixed fluid passage 25, the fuel does not collide with the wall (8) of the mixed fluid passage. Further, the fuel jet flows through the mixed fluid passage 25 while mixing with the atomizing medium in a state that includes the atomizing medium pipe 24, and even if the slurry fuel is separated into fuel oil and solid particles by the atomizing medium, the fuel jet does not become atomized. If the distance between the ejection port of the medium pipe 24 and the ejection port of the mixed fluid passage 25 is within the length of the diameter d of the injection port of the mixed fluid passage 25, the solid will not collide or slide against the inner wall of the mixing pipe. Therefore, wear on the inner wall of the mixed fluid passage 25 is not accelerated. Note that if the spout of the atomized medium pipe 24 protrudes into the furnace beyond the spout of the mixed fluid passage 'f625, there is a risk of burnout or the like. Therefore, the ejection port of the spray medium pipe 24 needs to be arranged inside the ejection port of the mixed fluid passage 25.

(effect) Since the present invention has the above configuration, it has the following effects.

(1) Abrasion of the wall of the mixed fluid passage 25 of the atomizer is extremely reduced, allowing stable fuel spraying.

(2) The fuel is also supplied to the outer cladding tube 2 of the atomizing medium tube 24.
7, the atomization phenomenon of the fuel due to expansion of the atomizing medium at the outlet of the atomizing medium pipe 24 is not impaired, and good atomization can be obtained.

In the embodiment of the atomizer, the atomizer was supplied from the axial center of the atomizer and the fuel from the outer circumference of the atomizer, but conversely, the fuel was supplied from the narrow part and the atomizer was supplied from the outer circumference. The design can be modified to feed the mixed fluid passageway from the chest.

Another embodiment of the present invention will be described with reference to FIG. 8. A spray medium section C path 33 is provided at the center of the rear end of the atomizer body 30, and a spray medium pipe 34 is provided in the spray distribution passage 33.

A fuel reservoir 31 is provided behind the atomizer body 30, and a fuel pipe 36 having a fuel passage 32 inside is connected to the fuel reservoir 31, and the fuel pipe 36 is inserted into the middle of the atomizing medium pipe 34 to form an L-shape. 3, and pass it through in the narrow direction of the spray medium tube 34. A mixing fluid passage 35 is provided at the tip of the spray medium pipe 34.
form. L is the axial distance between the injection port of the fuel pipe 36 and the injection port of the mixed fluid passage 35. D indicates the diameter of the mixed fluid passage 35. Arrow A32 indicates the flow of fuel.
34 indicates the flow of the spray medium. Also, there is a relationship of 0 to D in L. The functions and effects of this embodiment are the same as those of the embodiment shown in FIG. 6, and the explanation thereof will be omitted.

In addition, in this embodiment as well as in the above-described embodiment, fuel can be supplied from the axial center of the atomizer, and a spray medium can be supplied from the external chest of the atomizer to the mixed fluid passage.

(Experimental Data) FIG. 9 shows an experiment using the atomizer shown in FIG. 8 according to the present invention, where L is the axial distance between the jet port of the fuel pipe 36 and the jet port of the mixed fluid passage 35; D is the diameter of the mixed gas passage 36. The figure shows the amount of slight wear change in the wall of the mixed gas passage 36 in percentage when L is varied.

The horizontal axis shows the amount of slight wear on the wall of the mixed gas passage 36 (the time of L/D 21 is taken as 100 inches) and the vertical axis shows the amount of slight wear on the wall of the mixed gas passage 36.

The length is 8 mm.

As inferred from FIG. 9, it can be seen that when "/D" is 1 or more, the wear of the wall is significantly accelerated.

For the above reasons, it is necessary to do the following.

[Brief explanation of drawings]

Figures 1 to 5 show conventional examples; Figure 1 is a vertical sectional view taken along line I-I in Figure 3; Figure 2 is a view taken along line 1-1 in Figure 1; 1 is a vertical cross-sectional view of main parts, FIG. 5 is a V-V line cross-sectional view of FIG. 4, and FIG. 6 is a vertical cross-sectional front view of the present invention. , FIG. 7 is a view taken along the vn-vn # arrow in FIG. 6, FIG. 8 is a longitudinal sectional front view of another embodiment of the present invention, and FIG.
The figure is a graph showing the relationship between the amount of wear and L/D when FIG. 8 is used. 20.30...Atomizer body, 21,3]...Fuel reservoir, 22.32...Fuel passage, 23,33...Atomizing medium distribution passage, 24,34...Atomizing medium pipe, 25°35...
Spray medium mixed fluid passage, 26... Spray medium passage, 27.
- Cladding tube, l... Distance between the tip jet port of the spray medium pipe 24 and the jet port of the spray medium mixed fluid passage, d... Diameter of the jet port of the spray medium mixed fluid passage, 36... Fuel pipe. Figure 1 Figure 2 Figure 3 Figure 4 Figure 1 5 Figure 6 Figure 7 Figure 6 Figure 9 00 0C 70〇-Yu

Claims (1)

[Claims] A fuel comprising a plurality of spray medium mixed fluid passages that open at intervals in the circumferential direction of the front end face of an atomizer main body, and a plurality of spray medium passages and fuel passages that are communicated with each of the mixed fluid passages. In the spray atomizer, the spray medium pipe or fuel A fuel spray atomizer characterized in that an axial distance between an ejection port of the pipe to the mixed fluid passage and an injection port of the mixed fluid passage has a length from zero to a diameter of the injection port of the mixed fluid passage. .