KR100321029B1 - Pilot burner of radian tube for easy adjusting of ignition gap - Google Patents

Abstract

PURPOSE: The ignition gap formed between a plus and minus electrode of a pilot burner is adjusted easily and stably. CONSTITUTION: A pilot burner for radian tube is composed of a rod and an ignition tube connected to the plus and minus electrode of an ignition plug(110). The rod is composed of a main rod(11), a connection rod(12) and an ignition rod(14). The connection rod is formed with female screw portion in both ends. One of the female screw portion is connected to the main rod. The ignition rod is connected to the connection rod in one end, and a spark generating portion is formed in the other end.

Description

Pilot burner for radiant tubes with easy ignition clearance

The present invention relates to a pilot burner mounted to a heating radiant tube together with a main burner to ignite the main burner, and more particularly, to easily adjust an ignition gap formed so that sparks can be generated. Ignition is stable and structural stability is not affected by high temperature environment to prevent breakage due to thermal deformation, and the mixture of ignition fuel gas and air is more complete to improve the ignition performance of fuel gas. The present invention relates to a pilot burner for a radiant tube that is easy to adjust the ignition gap.

In general, annealing furnaces of steelmaking facilities are equipped with radiant tubes for heating strip steel sheets by radiant heat, and inside the radiant tubes, a main burner and radiant are capable of injecting combustion fuel. By mounting a pilot burner configured to ignite the combustion air supplied to the tube and the combustion fuel injected from the main burner, the combustion fuel and the combustion air are mixed and combusted inside the radiant tube. This combustion heat causes the strip to heat through the annealing furnace by radiation.

The conventional structure of the pilot burner 100 for ignition of the main burner is shown in FIG. 1, and is provided with an ignition plug 110 at one end that is located outside the radiant tube so that current can be supplied through the portion. Then, the power supply source of the current is high voltage to 7000V. The rod 120 integrally connected to the anode of the spark plug 110 forms a positive electrode as a member of a circular shaft shape having an appropriate length, and the rod 120 has all the outer surfaces except the end side surface thereof. The surface is insulated by coating with a ceramic insulator 122 having an appropriate thickness, and the ignition tube 130 connected to contact the cathode of the spark plug 110 may accommodate the rod 120 therein. As a hollow-cylindrical member forming a space, a negative electrode is formed, and the rod 120 and the ignition tube 130 extend a predetermined length in parallel with each other, and the end of the ignition tube 130 is a rod ( The inner diameter of the portion where the end of the rod 120 is slightly smaller than the end of the rod 120 is formed to be smaller than the inner diameter of the other portion, so that the outer surface of the rod 120 and the ignition tube 130 are formed. Between the inner surface of the end The gap forms the ignition gap, where electrical sparks form.

And, the outer side of the ignition tube 130 is a fuel supply tube 140 of the hollow cylinder shape is installed, the fuel supply tube 140 is the inner diameter and the ignition tube ( A fuel supply path is set through a space formed between the outer surfaces of the 130, and the fuel supply tube 140 forms a fuel hole 142 at a rear proper portion for receiving fuel.

Therefore, the operation of the pilot burner 100 for the ignition of the main burner is such that the fuel gas supplied through the fuel hole 142 is connected to the inner surface of the fuel supply tube 140 and the outer surface of the ignition tube 130. It is supplied to the end side of the rod 120 and the ignition tube 130 through a space formed between, and in this state to supply current through the spark plug 110 and the end of the positive electrode 120 and the negative electrode The fuel gas may be ignited by generating an electrical spark between the inner surface of the end of the ignition tube 130.

Reference numeral 150 is mounted to the end of the fuel supply tube 140 is formed to a position that extends a predetermined length more than the rod 120 and the ignition tube 130, the hollow park cylinder so that the combustion unit is located in the interior space And the 160 is provided with a plurality of longitudinal through holes 152 and is fixed to the inside of the combustion cylinder 150 so that the fuel hole 142 is supplied with the flow of fuel gas supplied through the rod 120. It is a nozzle to be formed in the appropriate portion of the end of the ignition tube 130 so that the ignition of the fuel gas is made stable.

However, in the conventional pilot burner 100, various problems may occur in that the ignition of the fuel gas is poor due to a change in the ignition gap formed between the rod 120 and the ignition tube 130. The conventional pilot burner 100 has a structure in which a gap between the rod 120 and the ignition tube 130 forming a spark is fixed, and a proper gap set by thermal deformation of the rod 120 (2 to 3 mm). ) Is changed to prevent proper spark generation, or to prevent the spark generation by the fixing of the scale (Scale) generated by the spark, poor ignition by the fixed scale 133 as shown in FIG. This occurs (see FIG. 2A) and the occurrence of ignition failure due to deformation of the rod 120 (see FIGS. 2B and 2C).

Accordingly, the present invention is to solve such a conventional problem, is to be installed in the annealing furnace, etc. of the steelmaking equipment to induce the initial ignition to the main burner which is the main ignition device in the radiant tube installed to heat the strip and the like by radiant heat The purpose of the present invention is to provide a pilot burner for the radiant tube with which the pilot burner can easily control the ignition gap formed between the positive electrode and the negative electrode so that the ignition gap of the main burner can be stably achieved. There is this.

Figure 1 is a schematic cross-sectional view showing a conventional pilot burner for radiant tube

2A to 2C are schematic explanatory diagrams for deriving a problem of a conventional pilot burner;

Figure 3 is a schematic cross-sectional view showing a pilot burner for the radiant tube easy to control the ignition gap in accordance with the present invention

Figure 4 is an exploded perspective view showing the configuration of the rod according to the present invention

5 is an external perspective view showing a pivot member according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ... load

11 ... main load

12 ... connection rod

14 ... ignition rod

15 ... spark generating plate

30,32 ... Ignition tube

40 ... turning member

44 ... through hole

46 ... turning gains

110 ... spark plug

140 ... fuel supply tube

150 ... combustion cylinder

160 ... nozzle

As a technical configuration for achieving the above object, the present invention is provided with a rod and a ignition tube connected to the anode and the cathode of the spark plug which is powered, respectively, the rod is coated on the outer surface of the ceramic insulator with an appropriate thickness The ignition tube is accommodated inside the furnace ignition tube, and the ignition tube is accommodated inside the fuel supply tube which forms the fuel hole, and the fuel supply tube includes a nozzle accommodating therein a nozzle having a plurality of through holes at the end of the ignition tube. A pilot burner configured to couple communication, wherein the rod includes a main rod connected to a spark plug, a connecting rod configured to form female threads at both ends thereof so that one female thread portion is coupled to a thread formed at an end of the main rod, and the connection A screw part formed to be coupled to the other female thread of the rod is formed at one end, and the spark generating plate is integrally fixed to the other end. An ignition gap is formed between the combustion tube and the spark generating plate by being composed of an ignition rod.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Figure 3 is a schematic cross-sectional view showing a pilot burner for the radiant tube easy to adjust the ignition gap according to the present invention, having a spark plug 110 at one end that is located outside the radiant tube The approximate configuration in which the rod 10 and the ignition tube 30 are connected to the anode and the cathode, respectively, to form an electrical spark for ignition therebetween is similar to the prior art.

A positive electrode is formed by integrally connecting the rod 10 having a circular shaft shape having an appropriate length to the anode of the spark plug 110, and the rod 10 has all other ends except the proper length at the end side thereof. The surface is insulated by coating with a ceramic insulator 122 of appropriate thickness, and the rod 10 is a main rod 11 directly connected to the spark plug 110, and female threads 12a (at both ends) ( 12b) is screwed to the connecting rod 12, one end of which is screwed to the threaded portion 11a of the main rod 11, and the female screw portion 12b of the other end of the connecting rod 12. A screw portion 14a formed to be connected to the end is formed at one end, and the other end is formed of a disc-shaped spark generating plate 15 and is composed of an ignition rod 14 which forms an ignition gap for spark generation in connection with an ignition tube. .

The ignition tubes 30 and 32 connected to contact the cathode of the spark plug 110 form a hollow cylinder-shaped member that forms an inner space to accommodate the rod 10 therein. The female thread portion is formed on the inner surface of the front end portion of the ignition tube 30 connected to the spark plug 110 of the ignition tube 30, and the rod 10 end side ignition tube 32 is formed in the rear end portion. The ignition tubes 30 and 32 are connected to each other by the pivot member 40 having the threaded portion 42a formed on the outer surface of both ends by forming a female threaded portion on the surface thereof. An end portion 32 is positioned between the end portion of the ceramic insulator 122 and the spark generating plate 15. Accordingly, an ignition gap is formed between the rear end surface of the spark generating plate 15 forming the rod 10 and the surface of the front end of the ignition tube 32 to generate electrical sparks there. It is.

The pivot member 40 is composed of a substantially hollow cylindrical member 42 having an inner diameter size the same as the inner diameter of the inner surface of the ignition tube (30) (32), the through-hole penetrating in the longitudinal direction ( 44) is provided with a plurality of circumferential directions at regular intervals, the outer surface is provided with a plurality of turning blades (46) to provide a turning path to the fuel gas to flow in the longitudinal direction along the outer surface, The swing blade 46 has a proper thickness, protrudes a predetermined length in the outer surface direction and is continuously formed from one end to the other end, and rotates in one direction (counterclockwise or clockwise) with respect to the longitudinal direction. It is formed in a thread shape.

In addition, the fuel supply tube 140 having a hollow cylinder shape is installed outside the ignition tube 30 as in the conventional structure, and the fuel supply tube 140 has an inner diameter thereof appropriately set so that the inner surface thereof. And a fuel supply path is set through a space formed between the outer surface of the ignition tube 30, and the fuel supply tube 140 forms a fuel hole 142 for receiving fuel at an appropriate rear side. do. In addition, it is mounted to the end of the fuel supply tube 140 is formed to a position that extends a predetermined length more than the rod 10 and the ignition tube 32 to the combustion chamber 150 of the hollow cylinder-shaped cylinder so that the combustion unit is located in the interior space And a plurality of longitudinal through holes 152 are fixed to the inside of the combustion cylinder 150 so that the flow of the fuel gas supplied through the fuel holes 142 is provided in the rod 10 and the ignition tube 32. It is provided with a nozzle 160 to be formed at the appropriate portion of the end so that the ignition of the fuel gas is made stable.

The ignition effect of the main burner by the pilot burner 1 of the present invention having such a configuration is that the fuel gas supplied through the fuel hole 142 is connected to the inner surface of the fuel supply tube 140 and the rear ignition tube 30. Is supplied to an end side of the rod 10 and the ignition tube 32 through a space formed between the outer surface of the), and such fuel gas is a pivot member that serves as a connecting member of the ignition tube 30, 32. Turning so that fuel gas can be uniformly distributed in the circumferential direction on the outer surface of the front ignition tube 32 and the inner surface of the combustion cylinder 140 while passing through the through-hole 44 and the turning blade 46 of 40. By making the ignition by the spark can be made stably to improve the ignition efficiency.

In addition, the spark generating plate 15, which is an end of the rod 10, is configured to protrude outwardly from the ignition tube 32, so that the position of the spark generated between them is close to the portion where the flow of fuel gas is generated. Thus, the ignition of the fuel gas is made easier.

In addition, the ignition rod 14 which integrally fixes the spark generating plate 15, which is an end of the rod 10, is screwed with the main rod 11 via the connecting rod 12 so that the spark generating plate 15 ) And the ignition gap formed between the ignition tube 32 is easy to adjust the appropriate ignition gap for spark generation.

Therefore, the ignition of the main burner by the pilot burner 1 of the present invention can be always performed normally so that the heating equipment such as annealing furnace can be stably maintained.

According to the pilot burner for the radiant tube according to the present invention, the ignition gap adjustment according to the present invention, as described above, the end of the rod, which is a positive electrode, can be positioned outside the ignition tube end, while at the same time the length adjustment is Since the spark generating part is located outside the end of the ignition tube, the spark is generated and the ignition by the spark is made stable, thereby improving the ignition efficiency of the pilot burner for the ignition of the main burner.

In addition, by distributing and turning the fuel gas on the outer surface side path of the supplied fuel gas so as to have a constant distribution with respect to the outer circumferential surface of the outer surface, the ignition is made easier.

Claims (3)

A rod and an ignition tube are respectively connected to the anode and the cathode of the spark plug 110 to which power is supplied, and the rod is accommodated inside the ignition tube with the ceramic insulator 122 coated on the outer surface with an appropriate thickness. The ignition tube is accommodated inside the fuel supply tube 140 forming the fuel hole 142, and the fuel supply tube 140 has a plurality of nozzles 160 having a plurality of through holes 162 at the end of the ignition tube. In the pilot burner to be coupled to the combustion cylinder 150 accommodated therein), The rod 10 has a main rod 11 connected to the spark plug 110 and female threads 12a and 12b formed at both ends thereof so that one female screw portion 12a is provided at an end of the main rod 11. A connecting rod 12 adapted to be coupled to the formed threaded portion 11a and a threaded portion 14a adapted to be coupled to the other female threaded portion 12b of the connecting rod 12 are formed at one end thereof, and a spark generating plate is formed at the other end thereof. 15. A pilot burner for radiant tube control of an ignition gap, characterized in that an ignition gap is formed between the combustion tube and the spark generating plate (15) by ignition rods (14) fixed integrally. The pilot burner for radiant tube according to claim 1, wherein the spark generating plate (15) extends outwardly longer than the ignition tube. According to claim 1, wherein the ignition tube 30, 32 is composed of a plurality of connected to each other, the connecting portion side end of the ignition tube 30, 32 each formed a female screw portion through a plurality of penetrating formed in the longitudinal direction It is characterized in that the fuel gas is pivoted by being connected to the threaded portions 42a provided at both ends of the pivot member 40, which is a hollow-cylindrical cylindrical member having a hole 44 and a plurality of swing blades 46 formed on the outer surface. Pilot burner for radiant tubes with easy ignition clearance.

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