JPS5833012A - Mixed fuel spray type atomizer - Google Patents

Abstract

PURPOSE:To provide a liquid-solid fuel mixture spray type atomizer which is prominent in wear resistance by a method wherein a fuel spray hole including a part which intersects an extension of a mixed fuel passage is designed to have an aperture gradually widened toward an outlet and treated by a wear proof process. CONSTITUTION:A passage from a joining point of a team passage 6 and a fuel passage 5 to a fuel spray hole 8 is shaped in a horn widened about 5 deg. toward its opening end. In this instance, the part 9 of the passage where abrasion loss occurs most severely is dimensioned in an aperture of 8mm. or the like. Further, the inside thereof is treated by permeation and diffusion process of boron so as to form a boron hardened layer 10 of a thickness about 250mum. The layer 10 is further treated by plating to form an extremely hardened layer 11 thereon. By this, the wear resistance of the atomizer is much improved, resulting in an improvement of reliability and elongation of the service life of the atomizer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid-solid mixed fuel spray atomizer, and more particularly to a mixed fuel spray atomizer that prevents abrasion damage to the inner wall of the spray hole caused by the liquid-solid mixed fuel.

Conventionally, this type of atomizer has a main supply path 3 for steam 1 formed in the central part of the atomizer, as shown in FIGS. 1 and 2, and
A passage 5 for liquid-solid mixed fuel 2 provided on the outside thereof;
A steam passage 6 provided through an orifice hole 4 at the tip of the main steam supply passage 3, and the solid-liquid heated fuel passage 5.
and a spray hole 8 including a spray mixing section where the above-mentioned inlet passage 6 joins. The liquid-solid mixed fuel passage 5 and the vapor passage 6 intersect, for example, at an angle of about 500 degrees.

However, such a configuration has the disadvantage that the inner wall 9 of the spray hole on the arc length line of the fuel passage 5 in the spray mixing section where the mixed fuel passage 5 and the steam passage 60 join is subject to severe wear and damage. That is, in the apparatus shown in FIG. 2, the steam 1 passes through the steam supply path 3 and the steam passage 6 at a pressure of 13 to 15 ajp, and the liquid-solid mixed fuel 2 passes at a pressure of 11 to 13 ajp.
The fuel passes through the fuel passage 5 at a pressure of at II@ and is supplied to the spray mixing section, where they are combined and mixed, and then sent to the spray hole 8.
Conventionally, the pore diameter of the spray mixing part 1.7 was 4 to 5W11 degrees, and its inner surface was used without any surface treatment. For this reason, as mentioned above, there is severe wear damage in the part 9 on the extension line of the fuel passage 5 in the spray mixing section 7 in the joining area of the vapor passage 6 and the liquid-solid mixed fuel passage 5, and a hole with a diameter of 2 to 3 m is formed. Problems such as scum often occur, which requires the atomizer to be replaced within a short period of time, and the reliability of the device is poor.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a liquid-solid mixed fuel atomizer having excellent wear resistance.

The present invention provides an atomizer in which a liquid-solid mixed fuel and vapor are converged and mixed from respective flow paths and ejected from a spray hole, in which a spray hole including a portion intersecting with a longitudinal line of the flow path of the mixed fuel is directed toward the outlet. It is characterized by gradually increasing the diameter and applying wear-resistant treatment to this part.

The inventor of the present invention examined the above-mentioned wear phenomenon in detail and found that the wear-damaged part 9 in FIG.
It was found that the angle was within the range below. Therefore, in the present invention, in order to prevent these wear phenomena, the passage from the joining area of the fuel passage 5 to the fuel spray hole 8 is made into a trumpet shape with a width of about 5 degrees, and the hole diameter of the 90 part where wear damage is desired for the longest 4 hours is determined. It was set to about 8W. Furthermore, this inner surface is penetrated and diffused with Poron.
A hardened boron layer 10 having a thickness of approximately 250 m was formed by burying. Moreover, it is extremely hard due to plating treatment (HV2000-3000) Plating layer 1
1 was formed. In this way, the fuel spray hole 8 is formed to have a larger diameter toward the outlet, and the spray mixture II 7 has severe wear and damage.
By forming two inner HK hardened layers extending from the spray hole 8 to the spray hole 8, wear resistance was significantly improved, and it was possible to achieve improved loading reliability and a longer service life.

The angle of inclination toward the outlet of the fuel spray hole 8 is 5″1
It is not limited to 1 fK, but may be made larger depending on the degree of wear and K. Furthermore, by forming the spray hole 8 into a trumpet shape, it becomes easy to perform wear-resistant processing on the spray hole 8, and for example, it is possible to form a thick poron hardened layer as described above. The abrasion-resistant treatment applied to the spray holes may be any treatment other than a combination of boron hardening and plating as long as it provides abrasion resistance superior to that of boron hardening and plating.

Although the above embodiments are directed to a liquid-solid mixed fuel such as mixed coal and heavy oil, the atomizer of the present invention is equally applicable to conventional oil-fired and coal-fired atomizers.

As described above, according to the present invention, the diameter of the spray hole of the spray mixing section in the joining area of the liquid-solid mixed fuel passage and the steam passage, which is subject to severe wear and tear, is increased toward the outlet, and the inner surface thereof is further subjected to metal hardening treatment. k, the wear resistance of the spray hole of the atomizer is significantly improved, and the reliability of the device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional atomizer, FIG. 2 is a cross-sectional view of the atomizer along Tl-l111, and FIG. 3 is a cross-sectional view of an atomizer showing an embodiment of the present invention. . 1-...Steam, 2...Fuel, 3...Steam supply path, 4
...Steam orifice hole, 5...Fuel passage, 6...
Steam passage, 8... fuel spray hole. Agent Patent Attorney Takenaga Kawakita

Claims (1)

[Claims] (1) In an atomizer that mixes liquid-solid mixed fuel and vapor from their respective flow paths and sprays the mixture from a spray hole,
A mixed fuel spray atomizer, characterized in that the diameter of the spray hole including the portion intersecting the elongated line of the mixed fuel flow path is gradually increased toward the outlet, and this portion is subjected to a wear-resistant treatment. (In claim 1, the wear-resistant treatment is
A mixed fuel spray atomizer characterized by forming two hardened layers: a hardened layer of Pron and a plating layer.