JPH0674421A - Atomizer burner - Google Patents

Abstract

PURPOSE:To make it hard for backfire to occur in the case of low load combustion and enable enhancing a revolving force of a swirl vane with the result that a good combustion performance resulted from a good flame holding capacity is provided. CONSTITUTION:An atomizer burner is constructed such that fuel sprayed and supplied from a fuel spray nozzle is introduced into a combustion cylinder 5 through a central hole 3a of a forwardly positioned swirl vane 3 for supply of air, and at least a part of air supplied is divided by a primary air partition cylinder 7 into a primary air which is to be introduced into a combustion chamber 5 through the central hole 3a of the swirl vane 3 from around the fuel spray nozzle 1 and a secondary air which is to be introduced into the combustion chamber 5 through a vane portion 3b of the swirl vane 3 and secondary air blowout holes 10 provided around the vane portion 3b. About the central hole 3a of the swirl vane 3 is provided a backfire screening ring 20 which converges toward the fuel spray nozzle located inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel spray type burner which sprays fuel into a combustion chamber for combustion.

[0002]

2. Description of the Related Art FIG. 3 shows a sectional view of a conventional fuel spray burner of this type. Reference numeral 1 is a fuel spray nozzle for oil fuel, and a spray cut plate 2 is arranged immediately in front of the nozzle 1.
The fuel sprayed from the nozzle 1 at a constant spread angle is partially cut by the spray cut plate 2, reaches a predetermined spray supply amount, passes through the central hole 3a of the swirl vane 3 arranged further forward, and burns. Introduced into chamber 5. Reference numeral 4 is an igniter. The swirl vane 3 is attached to a cone-shaped partition wall 6 that partitions the combustion chamber 5 from the fuel spray nozzle side. On the side of the fuel spray nozzle partitioned by the cone-shaped partition wall 6, a primary air partition cylinder 7 is arranged around the fuel spray nozzle 1, the tip of which is at the edge of the center hole 3a of the swirl vane 3. Further, the rear end reaches the fixed wall 8. A part of the air supplied along the arrow A enters the primary air partition tube 7 through the distribution holes 9 provided in the primary air partition tube 7, and is supplied as primary air to the fuel spray nozzle 1 from the fuel spray nozzle 1. It is introduced into the combustion chamber 5 from the surroundings through the central hole 3a of the swirl vane 3. The rest of the air supplied along arrow A is introduced into the combustion chamber 5 as secondary air through the blade portion 3b of the swirl blade 3 and the secondary air blowing hole 10 of the cone-shaped partition wall 6. To be done. The outer periphery of the combustion cylinder 11 is a tertiary air chamber 12, and the tertiary air supplied along the arrow B is introduced into the combustion chamber 5 from the tertiary air outlet 13.

[0003]

In the above conventional fuel spray type burner, in order to favorably perform combustion under a low load, the vane portion 3b of the swirl vane 3 and the secondary air blowing hole 10 are provided.
The amount of primary air introduced into the combustion chamber 5 from the periphery of the fuel spray nozzle 1 through the center hole 3a of the swirl vane 3 is preferably reduced by increasing the blowout pressure from the center hole 3a.
If the amount of primary air introduced into the combustion chamber 5 through the same is reduced, there is a problem that the flame in the combustion chamber 5 tends to flash back from the central hole 3a of the swirl vane 3 to the nozzle 1 side. For this purpose, the diameter of the central hole 3a of the swirl vane 3 may be reduced, but the central hole 3a has a limit to the diameter reduction because it secures the passage of the supplied spray fuel. . Therefore, the amount of primary air passing through the central hole 3a cannot be extremely reduced, and as a result, the swirl force of the swirl vane 3 cannot be increased, and the flame holding power and combustion performance cannot be improved. .

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, makes it difficult for flashback to occur even when performing low-load combustion, and can improve the turning force of the turning blades.
As a result, an object of the present invention is to provide a fuel spray burner having good combustion performance with good flame holding power.

[0005]

In order to achieve the above object, the fuel spray burner of the present invention has a center of a swirl vane for supplying the fuel spray-supplied from the fuel spray nozzle side to the front. The air is introduced into the combustion chamber through the holes, and at least a part of the supplied air is introduced into the combustion chamber from the periphery of the fuel spray nozzle through the center hole of the swirl vane by the primary air partition tube. What is claimed is: 1. A fuel spray burner for distributing air and secondary air introduced into a combustion chamber through a secondary air blowing hole provided in the swirl vane and its surroundings, It is characterized in that the central hole is provided with a flashback shield ring which is tapered toward the inner side of the fuel spray nozzle.

[0006]

According to the above feature, since the flashback shield ring, which is tapered toward the inner side of the fuel spray nozzle, is provided in the center hole of the swirl vane, it does not hinder the passage of the sprayed fuel. The hole through which the fuel spray nozzle side and the combustion chamber side communicate with each other can be made small, and flashback can be made difficult to occur. That is, since the cross-sectional area of the fuel spray becomes smaller as it approaches the fuel spray nozzle side, by providing a flashback shield ring that is tapered toward the fuel spray nozzle side in the center hole of the swirl vane, It is possible to make the hole communicating between the fuel spray nozzle side and the combustion chamber side small without hindering. Therefore, the primary air can be throttled to increase the distribution ratio of the secondary air passing through the blade portion of the swirl blade, and a fuel spray burner having good flame holding property and low back load combustion performance without backfire can be provided. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a fuel spray burner showing an embodiment of the present invention, and FIG.

The structure of the fuel spray nozzle 1, the spray cut plate 2, the swirl vane 3, the combustion chamber 5, the primary air partition cylinder 7, the fixed wall 8 and the like is the same as that of the conventional example described above, and therefore has the same function. The same members and elements are given the same numbers, and the description thereof will be omitted.

In the present invention, the central hole 3a of the swirl vane 3
Further, a flashback shield ring 20 is provided which is tapered toward the inner side of the fuel spray nozzle. This flashback shield ring 20
In the embodiment, the tip portion of the primary air partition cylinder 7 that abuts on the edge of the center hole 3a of the swirl vane 3 is extended and bent inward to be integrally formed. The converging angle of the flashback shield ring 20 is set to be approximately the same as the spread angle of the fuel spray passing through the center hole 3a of the swirl vane 3, so that the fuel spray is not hindered and the opening efficiency is improved. It can be made small. The tip of the flashback shield ring 20 extends close to the periphery of the spray cut plate 2 to make the gap through which the primary air passes relatively narrow. Further, a part of the flashback shield ring 20 is cut out so as not to interfere with the spark generated by the igniter 4.

The flashback shield ring 20 may be fixed to the edge of the central hole 3a of the swirl vane 3 so as to be provided integrally therewith, or it may be provided integrally with the edge of the central hole of the cone-shaped partition wall 6. Good.

[0011]

According to the fuel spray burner of the present invention, the central hole of the swirl vane is tapered toward the inner side of the fuel spray nozzle. Since the flashback shield ring is provided, the flashback from the combustion chamber side can be suppressed without hindering the fuel spray. Therefore, the distribution amount of the primary air introduced into the combustion chamber from the periphery of the fuel spray nozzle through the central hole of the swirl vane can be reduced to increase the distribution amount of the secondary air. It is possible to increase the amount of air passing through and increase the flame holding power of combustion, and to stably perform low load combustion. Further, by providing the flashback shield ring, the gap between the ring and the fuel spray nozzle side becomes narrower by that amount, and the flow velocity of the primary air passing through the central hole of the swirl vane becomes faster, which also prevents flashback. The effect can be improved.
In addition, since the flow velocity of the primary air is increased, the spray is suppressed from adhering to the flashback shield ring due to the presence of the flashback shield ring.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of a fuel spray type burner showing an embodiment of the present invention.

FIG. 2 is a cross-sectional configuration diagram of a main part.

FIG. 3 is a cross-sectional configuration diagram of a conventional fuel spray burner.

[Explanation of symbols]

 1 Fuel Spray Nozzle 2 Spray Cut Plate 3 Swirling Blade 3a Center Hole 3b Blade 5 Combustion Chamber 7 Primary Air Partition Tube 10 Secondary Air Blowing Hole 20 Flashback Shield Ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akinobu Kawafu 32 No. Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu

Claims (1)

[Claims] 1. A fuel spray-supplied from a fuel spray nozzle side is introduced into a combustion chamber through a center hole of a swirl vane for air supply arranged in the front, and at least a part of the supplied air is 1 The primary air introduced into the combustion chamber from the periphery of the fuel spray nozzle through the central hole of the swirl vane and the vane portion of the swirl vane and the secondary air blowout holes provided in the periphery thereof are provided by the secondary air partition tube. A fuel spray burner adapted to be distributed to the secondary air that is introduced into the combustion chamber through a reverse hole that is tapered in the center hole of the swirl vane toward the inner fuel spray nozzle side. A fuel spray burner characterized by having a fire shield ring.