JPH07198113A - Flame holding device for burner - Google Patents

Abstract

PURPOSE:To prevent a ring flame from quenching due to the adhesion of carbon on the surface at the furnace internal side of a flame holding device of a burner. CONSTITUTION:A ring flame 7 is formed in the vicinity of the surface at the furnace internal 10 side of a flame holding device 6 with one part of a fuel 4 which is fed from a burner gun 3 and one part of primary air 5 which is fed from a primary air nozzle 1, for a flame holding device of a burner. For such a flame holding device, a plurality of primary air intake holes 11 which go through the flame holding device 6 are provided. At the same time, on the furnace internal 10 side of said holes 11, a guide plate 12 which changes the direction of the primary air having passed said holes 11 in the direction being approx. in parallel with the surface on the furnace internal 10 side of the flame holding device 6 is provided to form an air curtain which goes along the surface on the furnace internal 10 side of the flame holding device 6, and carbon is prevented from adhering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame holding device used for a burner of a commercial boiler, an industrial boiler, etc.

[0002]

2. Description of the Related Art An example of a conventional flame holding device for an oil-fired burner will be described with reference to FIGS. Fuel 4 in the furnace 10
The burner gun 3 to be supplied to the furnace is arranged in the guide tube 2, and a flame stabilizer 6 having a trumpet shape toward the furnace 10 is attached to the tip end of the guide tube 2 on the furnace inside 10 side. Are arranged around the tip of the burner gun 3 inside the furnace. A primary air nozzle 1 is provided around the burner gun 3 and the guide tube 2 to supply primary air 5 into the furnace 10 coaxially therewith.
Are arranged.

The fuel 4 is supplied into the furnace 10 from the tip of the burner gun 3 on the side of the furnace 10. On the other hand, the primary air 5 is provided at the outlet of the primary air nozzle 1 on the in-furnace 10 side by the flame stabilizer 6 and a plurality of through holes 6a provided near the center of the flame stabilizer 6, as shown in FIG. Flows 5a to 5d and inside the furnace 10
Is supplied to.

When ignited by an ignition source (not shown) in the above state, the ring frame 7 and the combustion flame 8 are formed. When the primary air 5 is supplied, a negative pressure is generated in the vicinity of the surface of the flame stabilizer 6 on the furnace side 10 side, and a part of the primary air 5b and the fuel 4 is entrained in this negative pressure portion to form a proper air-fuel mixture. Therefore, the ring frame 7 is formed. This ring frame 7 is a stable flame, and once formed, it self-holds flames even without an ignition source, enabling continuous combustion.

[0005]

In the above-mentioned conventional flame holding device for a burner, a portion near the surface of the flame holder 6 on the inside 10 side of the furnace is in a direction along the surface of the flame holder 6 although there is a flow of entrainment. There is almost no flow. Therefore, the carbon 9 generated by combustion adheres to the flame stabilizer 6 and grows. When the adhesive force is weak, the carbon is peeled off by its own weight when it grows to some extent, but when the adhesive force is strong, the carbon is grown and is not peeled off. If the carbon 9 remains adhered and grown on the surface of the flame stabilizer 6 on the side of the furnace 10 side, the primary air 5b and a part of the fuel are not entrained in the vicinity of the surface of the flame stabilizer 6 on the side of the furnace 10 side. 7 disappears. As a result, the ignition point of the combustion flame 8 becomes unstable, and in the worst case, misfire occurs.

The present invention is intended to provide a flame holding device for a burner which can solve the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention comprises a burner gun for supplying fuel into a furnace and a flame stabilizer provided around the tip of the burner gun inside the furnace. Part and a part of the primary air supplied into the furnace, in the flame stabilizer of the burner forming a ring frame in the vicinity of the surface of the flame stabilizer inside the furnace, the flame stabilizer from outside the furnace to inside the furnace A guide plate for providing a plurality of primary air intake holes penetrating therethrough and deflecting the primary air that has passed through the primary air intake hole inside the furnace toward the furnace inside surface of the flame stabilizer by being deflected substantially parallel to the surface. I placed it.

[0008]

In the present invention, part of the primary air from the primary air nozzle passes through the plurality of primary air intake holes provided in the flame stabilizer toward the inside of the furnace, and this air is guided by the guide plate to the flame stabilizer. It is deflected and blasted almost parallel to the inner surface of the furnace, and flows along the inner surface of the flame stabilizer to form an air curtain. This prevents carbon generated by combustion from adhering to the surface of the flame stabilizer inside the furnace.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2, the same parts as those of the conventional device shown in FIGS. 3 and 4 are denoted by the same reference numerals as those in FIGS. 3 and 4, and the description thereof will be omitted. Only new parts will be described below. .

In the present embodiment, a plurality of primary elongated shapes are arranged outside the through hole 6a of the flame stabilizer 6 in the radial direction of the flame stabilizer 6 and penetrate the flame stabilizer 6 from the outside of the furnace to the inside 10 of the furnace. The air intake holes 11 are provided at equal intervals. Further, on the inside 10 side (downstream side) of each primary air intake hole 11,
A guide plate 12 arranged in parallel with the surface of the flame stabilizer 6 on the side of the furnace 10 at a slight distance from the side of the flame holder 6 on the side of the furnace 10.
Is provided. As shown in FIG. 1, each guide plate 12 is arranged in the radial direction of the flame stabilizer 6 and has a fan shape. As shown in FIG. 2, the outer and inner portions of the radial direction are L-shaped. The air chamber 13 is formed in a curved shape and is attached at its tip to the flame stabilizer 6, and is open at both sides, and between the guide plate 12 and the flame stabilizer 6 is open at both sides. Has been done.

In the present embodiment, a part 5e of the primary air from the primary air nozzle passes through a plurality of primary air intake holes 11 of the flame stabilizer 6 and a plurality of air chambers on the furnace side 10 side of the flame stabilizer 6. 1
3, the flow direction is changed by the guide plate 12 in each air chamber 13, and a part 5e of the primary air flows from both sides of the air chamber 13 into the furnace of the flame stabilizer 6 as shown by the arrow in FIG. 1
It jets out almost in parallel with the surface on the 0 side, flows along the surface of the flame stabilizer 6 on the side of the furnace 10 side, and forms an air curtain on the surface.

This prevents carbon generated by combustion from adhering to the surface of the flame stabilizer 6 on the side of the furnace 10 side, and the ring frame formed near the surface of the flame stabilizer 6 on the side of the furnace 10 side. 7 can be reliably maintained without disappearing, the ignition point of the combustion flame 8 can be stabilized, stable combustion can be continuously performed, and misfire can be prevented.

[0013]

According to the present invention, a plurality of primary air intake holes penetrating the flame stabilizer from the outside of the furnace to the inside of the furnace are provided, and the primary air passing through the primary air intake holes inside the furnace is retained by the flame stabilizer. By arranging a guide plate that deflects and ejects gas almost parallel to the surface, an air curtain is formed along the inner surface of the flame stabilizer in the furnace, and carbon adheres to the inner surface of the flame stabilizer in the furnace. This prevents the ring flame from disappearing, and stable combustion can be continued.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a front view of a conventional flame holding device for a burner.

4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 Primary Air Nozzle 2 Guide Tube 3 Burner Gun 4 Fuel 5 Primary Air 5a to 5d Flow of Primary Air 5e Part of Primary Air 6 Flame Holder 7 Ring Frame 8 Combustion Flame 11 Primary Air Intake Hole 12 Guide Plate 13 Air Chamber

Claims (1)

[Claims] 1. A burner gun for supplying fuel into the furnace, and a flame stabilizer provided around a tip of the burner gun inside the furnace, and a part of the fuel supplied from the burner gun and the fuel supplied to the inside of the furnace. In a flame stabilizer of a burner that forms a ring frame near the surface of the flame stabilizer inside the furnace by a part of the primary air, a plurality of primary air intakes penetrating the flame stabilizer from outside the furnace to inside the furnace. A hole is provided, and a guide plate is arranged inside the furnace of the primary air intake hole for diverting and ejecting the primary air that has passed through the hole while changing its direction substantially parallel to the surface of the flame stabilizer inside the furnace. Burner flame holding device.