KR100758416B1 - An auxiliary ignition apparatus for sensing flame - Google Patents

Abstract

The present invention performs auxiliary ignition before the main ignition and if the flame by the auxiliary ignition is not detected is automatically moved to detect the flame, if the flame is not detected for a certain time automatically shut off the supply of gas incomplete combustion It relates to an auxiliary ignition device for flame detection configured to prevent and improve the combustion efficiency.

The present invention provides an ignition apparatus for performing auxiliary ignition, including a gas supply pipe installed in a radiating tube of an annealing furnace, a cutoff valve for blocking gas supply to the gas supply pipe, a combustion pipe on one side of the gas supply pipe, and a current supply power supply. An ignition detection unit (10) including a plurality of ignition rods (15) installed radially movably on the combustion pipe (41) and having a current detection sensor therein; A moving unit 20 including a cylinder 21 for moving the ignition detecting unit 10; And a controller 30 receiving the current sensing signal from the ignition sensing unit 10 and transferring the current sensing signal to the moving unit 20 and the cutoff side 65. It provides an auxiliary ignition device for detecting the flame, characterized in that to perform the main ignition or flame incineration automatically by controlling the operation of the moving unit 20 and the blocking side 65 according to the signal.

Ignition rod, flame detection, ignition detection unit, moving unit, control unit

Description

Auxiliary ignition device for flame detection {AN AUXILIARY IGNITION APPARATUS FOR SENSING FLAME}

1A is an installation diagram of a conventional auxiliary ignition apparatus;

1B is a schematic diagram showing the detection range of a flame;

2A is a cross-sectional view of an unignitioned state of a conventional auxiliary ignition apparatus;

2B is a sectional view of an ignition state of a conventional auxiliary ignition apparatus;

Figure 2c is a cross-sectional view showing a short flame state of a conventional auxiliary ignition apparatus;

Figure 2d is a cross-sectional view showing a long flame state of the conventional auxiliary ignition apparatus;

2E is a cross-sectional view showing a state in which the ignition rod of the conventional auxiliary ignition apparatus is damaged;

3 is a perspective view showing an assembled state of the auxiliary ignition apparatus according to the present invention;

4 is a cross-sectional view of the auxiliary ignition apparatus according to the present invention;

5 is an exploded perspective view of the auxiliary ignition apparatus according to the present invention;

6 is a perspective view of the insulating ring and the traverse ring of the auxiliary ignition apparatus according to the present invention; And

7 is an operation diagram showing the operation of the auxiliary ignition apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

 10 ... ignition detector 11 ... traverse ring

 12 ... insulation ring 15 ... ignition rod                 

 20 ... moving part 21 ... cylinder

 22 ... shaft 23 ... insulated shaft

 24 ... insulating ring 25 ... electrorod

 30 ... Controls 31 ... Power Switch

 32 ... amplifier 33 ... detector

 34 ... Monitor 39 ... Control Computer

 41 ... combustion line 42 ... touch ring

 43 ... injection nozzle 55 ... gas supply line

 64 ... Mixed gas 65 ... Shut-off valve

100 ... auxiliary ignition apparatus for flame detection according to the present invention

The present invention relates to an apparatus for auxiliary ignition of a combustion apparatus for indirectly heating a radiating tube in an annealing furnace, and more particularly, to perform auxiliary ignition before main ignition and to automatically move when a flame by auxiliary ignition is not detected. The present invention relates to an auxiliary ignition device for flame detection configured to detect flames and to prevent incomplete combustion and improve combustion efficiency by automatically shutting off gas supply when flame detection is not performed for a predetermined time.

FIG. 1A shows a conventional auxiliary ignition device, FIG. 1B shows a detection range of a flame, and FIGS. 2A to 2B show an unignition state and an ignition state of a conventional auxiliary ignition device, and FIGS. The state of the flame of the auxiliary ignition device of the short and long state is shown, Figure 2e shows a state that the ignition rod of the conventional auxiliary ignition device is damaged.

In general, a pilot burner 50, which is a combustion device that indirectly heats the radiating tube 51 in the annealing furnace, includes an electrode 54, a gas supply pipe 55, and one side of the electrode 54. It is composed of a power supply for supplying current to the ignition rod 57 through the ignition rod 57 mounted on the stage, the nozzle 56 installed around the ignition rod 57 and the electrification rod 54. as shown in e.

1A and 2A to 2B, currents supplied from the power source generate sparks in the ignition rod 57 via the electric rod 54 and at this time, through the nozzle 56. The injected mixed gas is ignited and combusted to make auxiliary ignition. The mixed gas includes COG (Coke Oven Gas) gas and air, and when the mixed gas is injected through the nozzle 56 while the ignition rod 57 maintains a constant interval, the ignition rod 57 Auxiliary ignition is achieved by the spark generated in Usually, the ignition rod 57 is equipped with a detection sensor (not shown) capable of detecting a microcurrent generated in the flame ignited by the auxiliary ignition.

Referring to FIG. 1B, the flame is generally divided into subdivisions, and there is a sensing portion 58b in which a microcurrent is sensed in the middle portion of the flame, and an undetectable region 58c in which the microcurrent is not sensed on both sides thereof.

When the minute current of the flame ignited by the auxiliary ignition is detected by a detection sensor installed in the ignition rod 57, this detection signal is transmitted to the control panel installed outside via the electric rod 54, and the detection signal is Opening the shut-off side of the COG supply pipe of the pilot burner 50 to supply the mixed gas 63 of the COG and air is made dominant.

On the other hand, if the detection signal is not sent to the control panel for a predetermined time (approximately 10 seconds), the control panel automatically closes the cutoff valve of the COG supply pipe to stop the supply of the main raw material gas and thereby assists. Flames ignited by ignition are extinguished.

However, in the pilot burner 50, which is a conventional auxiliary ignition device, as shown in FIG. 2E, the spark ignition rod 57 deteriorates due to the sudden rise in temperature due to the flame caused by the auxiliary ignition and the flame caused by the main ignition. Accordingly, a phenomenon in which the ignition rod 57 is bent occurs.

When the ignition rod 57 is bent, the spacing between the nozzle 56 and the ignition rod 57 is not kept constant, so that spark is not easily generated, and thus, auxiliary ignition is not easily performed. In addition, since the ignition rod 57 continues to be bent even though the flame is generated by the auxiliary ignition, the sensor installed in the ignition rod 57 does not detect the flame properly, and thus the control panel It is determined that the flame is extinguished without detecting the flame, thereby blocking the blocking side of the COG supply pipe to the pilot burner 50, thereby preventing the main lighting from being properly performed.

In addition, even in a state in which the ignition rod 57 is normally ignited, the state of the flame is often shortened or lengthened by a change in supply of COG and air and a change in atmospheric pressure.

Referring to FIG. 2C, this illustrates a case where the flame generated by the pilot burner 50 is short, and the sensor in the ignition rod 57 does not properly detect the flame. Referring to FIG. As the flame generated from the pilot burner 50 is elongated, the ignition rod 57 is disposed in an undetectable area of the flame, and thus, the flame is not properly detected. That is, when the flame is formed short or long in accordance with the peripheral supply conditions of the mixed gas in a state where the ignition rod 57 of the pilot burner 50 is fixed, the ignition rod 57 may be disposed in an undetectable area of the flame. If the flame detection is not possible for a certain time, the control panel will automatically block the COG supply blocking valve, there is a problem that the ignition is not properly made.

In addition, the flame is formed long or short from the normal state as a result of the combustion of the air ratio compared to the COG out of the normal condition, there is a problem that a large amount of carbon monoxide (CO) that is one of the environmental pollution gas is generated to pollute the environment.

In addition, the temperature of the annealing furnace is not kept constant by an abnormal flame longer or shorter than the normal flame, and more fuel is input to compensate for this, and fuel waste is generated accordingly. There is a problem that adversely affects the production of the product because it is impossible to maintain unbalanced temperature.

In order to solve the above problems, Utility Model No. 20-1998-7034, `` Pilot Burner for Ignition Main Burner Ignition Furnace '', has four ignition rods arranged up, down, left, and right to detect flames. The ignition rod is thus prevented from flexing to one side by high temperature. However, the ignition rod also has a problem in that the burner is not extinguished because the ignition rod may not be properly detected because the flame is likely to be disposed in an undetectable area of the fine current when the flame length is long or short.

The present invention is to solve the conventional problems as described above, even if the length of the flame in accordance with the change in the pressure of the mixed gas and air in the auxiliary ignition device automatically finds the flame and detects it, accordingly It is an object of the present invention to provide an auxiliary ignition apparatus for flame detection that improves thermal efficiency by keeping the temperature in the annealing furnace constant at all times so as to easily occur.

In order to achieve the above object, the present invention provides a gas supply pipe installed in the radiating tube of the annealing furnace and including an injection nozzle therein, a blocking side for blocking gas supply to the gas supply pipe, and coupled to one side of the gas supply pipe. An ignition apparatus for performing auxiliary ignition including a combustion tube and a current supply power source, comprising: a plurality of ignition rods 15 radially installed on the combustion tube 41 so as to be movable and having a current sensing sensor therein; Ignition detection unit 10; A moving unit 20 including a cylinder 21 for moving the ignition detecting unit 10; And a controller 30 receiving the current sensing signal from the ignition sensing unit 10 and transferring the current sensing signal to the moving unit 20 and the cutoff side 65. By controlling the operation of the moving unit 20 and the blocking valve 65 according to whether the signal is provided by the auxiliary ignition device for the flame detection, characterized in that the main ignition or flame incineration is automatically performed.

Hereinafter, the configuration of the auxiliary ignition device 100 (hereinafter referred to as the auxiliary ignition device 100) for flame detection according to the present invention will be described in more detail with reference to the drawings.

3 shows an assembled state of the auxiliary ignition device 100 according to the present invention, FIG. 4 shows a cross section of the auxiliary ignition device 100, and FIG. 5 shows an exploded view of the auxiliary ignition device 100. 6 shows the insulating ring 12 and the traverse ring 11 of the auxiliary ignition device 100 in more detail.

3 to 6, the auxiliary ignition apparatus 100 according to the present invention includes an ignition detection unit including a plurality of ignition rods 15 which are radially movably disposed on a combustion tube 41 in which a flame is largely generated. 10, the moving unit 20 including the cylinder 21 for moving the ignition detecting unit 10 and the current sensing signal received from the ignition detecting unit 10 receive the current from the moving unit 20 and the It is composed of a control unit 30 for transmitting to the blocking side (65).

3, the auxiliary ignition apparatus 100 according to the present invention includes a gas supply pipe 55 for supplying a mixed gas 64 composed of COG and air. The gas supply pipe 55 has a cylindrical shape, and a gas pipe connector 45 for supplying COG to one side and an air pipe connector 44 for supplying air are formed, and the COG and air supplied through the gas supply pipe It is mixed and supplied in the 55.

The gas supply pipe 55 has a transparent member 46 inserted into and mounted on one side thereof, and a protective tool 47 for protecting it is screwed thereon. The transparent member 46 is made of glass and transparent plastic, the operator can observe the internal flame state from the outside through the transparent member 46.

In the gas supply pipe 55, a cylindrical pipe 58 connected to the transparent member 46 is elongated, and an injection nozzle 43 is inserted and mounted at one end thereof. The mixed gas 64 in the gas supply pipe 55 is injected and discharged through the injection nozzle 43.

In one side of the gas supply pipe 55, a plurality of ignition rods 15 are radially installed, the ignition detection unit 10 is disposed. The ignition detection unit 10 includes a combustion tube 41 in which the flame generated by the ignition is burned.

Referring to FIG. 5, threaded portions 41b are formed at both sides of the combustion tube 41, and touch rings 42 are screwed to the threaded portions 41b, respectively. In addition, the outer circumferential surface of the combustion tube 41 is formed with a rectangular departure prevention jaw (41a) protruding, and four long sliding holes (41b) are formed in the outer circumferential surface area except the departure prevention jaw (41a) at regular intervals.

A cylindrical insulating ring 12 is disposed around the combustion tube 41, and a rectangular sliding groove 12a is formed on an inner side surface of the insulating ring 12 to correspond to the separation preventing jaw 41a. 6, four insertion holes 12b are formed on the outer circumferential surface of the insulating ring 12 to insert the ignition rods 15 at positions corresponding to the sliding holes 41b, respectively. have. In addition, female screw holes 12c through which screws can be coupled are formed between the insertion holes 12b. The insulating ring 12 is made of a ceramic material.                     

The sliding groove 12a is formed to be slightly larger in size than the release preventing jaw 41a. Accordingly, the insulating ring 12 can be freely moved along the longitudinal direction of the outer circumferential surface of the combustion tube 41.

A circular ring-shaped traverse ring 11 is disposed around the insulating ring 12, and a side plate 11a is attached to a side surface of the outer circumferential surface of the traverse ring 11, and the side plate 11a is provided. Two female screw holes 11c and 11d are formed in the hole. In addition, four insertion holes 11e corresponding to the sliding hole 41b and the insertion holes 12b are formed on the outer circumferential surface of the traverse ring 11, and the female screw holes are formed between the insertion holes 11e. Female threaded holes 11d corresponding to the holes 12c are formed.

Referring to FIG. 5, the insulating ring 12 is inserted into and coupled with the sliding groove 12a to the release preventing jaw 41a around the combustion tube 41, and traverses around the insulating ring 12. The traverse ring 11 is integrally coupled to the insulating ring 12 by the bolts 63 inserted into the ring 11 and screwed through the female screw holes 12c and 11d at once. do.

In addition, the insertion holes 11e of the traverse ring 11 and the insertion holes 12b of the insulating ring 12 and the sliding holes 41b of the combustion tube 41 correspond to each other. Ignition rods 15 are mounted to the traverse ring 11 while passing through the holes 11e, 12b and 41b at once. Accordingly, when the traverse ring 11 is moved, the insulating ring 12 integrally screwed thereto is guided along the longitudinal direction of the combustion tube 41, and the ignition rods 10 are the sliding holes 41b. ).                     

Referring to FIG. 3, the traversing ring 11 is coupled to a moving unit 20 capable of moving it. The moving part 20 includes a cylinder 21 coupled to one end of the shaft 22 screwed to the female screw hole 11b formed in the side plate 11a of the traverse ring 11. Threaded portions 22a are formed at both ends of the shaft 22, and an insulating shaft 23 made of ceramic is fitted in the middle of the shaft 22 to be coupled thereto.

Another female screw hole (11c) formed in the side plate (11a) of the traverse ring (11) is screwed with an electric rod (25) through which a current having a threaded portion (25a) formed at the side end is screwed, and the electric rod ( At one end of the 25, the connection ring 28 is screwed while being tightened by nuts 26 disposed on both sides. The connection ring 28 is connected to the power cable 37 of the controller 30 to be described later.

An insulating ring 24 made of ceramic is inserted into and coupled to the middle of the electric rod 25, and the insulating ring 24 extends downward to be inserted into the shaft 22.

The middle plate 29 is inserted into the middle of the gas supply pipe 55, the holes (29a, 29b) formed in the square plate 29 and the shaft 22 is coupled to the cylinder 21, respectively; The electric rod 25 is passing.

According to the configuration described above, when the shaft 22 is moved by the operation of the cylinder 21, the traverse ring 11 connected thereto is moved and thus the ignition rods 15 coupled to the traverse ring 11. The movable rod 15 is movable in the area of the sliding hole 41b of the combustion tube 41.

Figure 7 shows the overall operation of the auxiliary ignition device 100 according to the present invention, a control unit 30 connected to the moving unit 20 is shown.

The control unit 30 is a power source 31 for supplying current to the electric rod 25 through a power cable 37 connected to the connection ring 28 screwed to the electric rod 25, connected to the current An amplifier 32 for amplifying a, a detector 33 connected to the amplifier 32 and receiving a current signal from a current sensing sensor installed in the ignition rods 15 and outputting the current signal for the operator to see. A monitor 34, a control computer 39 connected to the monitor 34 and receiving signals from the detector 33 and transferring the signals to the moving unit 20 and the blocking side 65, respectively.

That is, the control computer 39 of the control unit 30 is arranged in front of the COG supply device 68 which is connected to the gas pipe connection 45 through the cable 37 to supply the COG to adjust the supply amount of the COG Is connected to the blocking side 65 and is connected to the cylinder 21 of the moving part 20.

By the configuration as described above, the controller 30 detects the current signals from the ignition rods 15 by the detector 33 and displays the result through the monitor 34 based on the current signal. The control computer 39 controls the operation of the cylinder 21 and the shut-off side 65 of the moving part 20 according to the internal control logic.

Hereinafter, the operation of the auxiliary ignition device 100 according to the present invention.

Referring to FIG. 7, in the auxiliary ignition device 100 according to the present invention, when a power switch 31 is pressed, a small amount of COG and air are supplied to the gas supply pipe 55 together with a current from the power supply 31. It is supplied to the electrorod 25 via 37.

That is, the signal of the power switch 31 partially opens the blocking side 65 disposed at the front end of the gas supply device 68 for supplying the COG, so that the COG is discharged from the gas supply device 68. It is moved to the connector 45 and the COG and air in the gas supply pipe 55 forms a mixed gas (64).

The mixed gas 64 is injected through the injection nozzle 43 coupled to one end of the gas supply pipe 55, and at the same time, the amplifier 32 in the control unit 30 amplifies the voltage to 10000 volts A high current is supplied to the electrorod 25 via a cable 37.

At this time, since the insulating ring 24 made of ceramic and the insulating shaft 23 made of ceramic are disposed in the middle of the electric rod 25, discharge of current is prevented, and the ignition detecting unit 10 is already disposed at an initial position, that is, a position approximately 2 mm apart from the injection nozzle 43, before the power switch 31 is pressed.

When the mixed gas 64 is injected from the injection nozzle 43, the high current amplified by the amplifier 32 and supplied to the electric rod 25 is applied to the traverse ring 11 of the ignition detection unit 10. The spark is generated between the ignition rods 15 and the ignition rods 15, and the mixed gas 64 is ignited by the spark generated thereby to ignite the combustion tube 41. Is done.

When the ignition is made, there is a flame passing through the ignition rods 15 having a constant gap, wherein the current sensor in the ignition rods 15 is in the detection range of the flame (see FIG. 1B). Detects the existing microcurrent. The microcurrent is approximately 0.2 to 1.6 mmA and the current sensing signal of the current sensing sensor is transmitted to the detector 33 of the controller 30 via the electrod 25 and the cable 37.

The detector 33 transmits the current signal back to the cutoff side 65 disposed at the front end of the gas supply device 68, and the cutoff side 65 is completely opened by the current signal. 55, a large amount of mixed gas 64 is supplied, and the mixed gas 63 is burned out by the flame formed in the combustion tube 41. The heat generated by the main ignition is transferred to the radiation tube 51 coupled around the combustion tube 41 to directly heat the radiation tube 51 and indirectly induce the temperature in the annealing furnace. Heating is performed to maintain a constant annealing temperature in the annealing furnace.

However, the flame formed by the auxiliary ignition in the combustion tube 41 before the main ignition is formed is shorter or longer than the normal flame when the supply amount of COG and air is not constant or the pressure is changed, in which case the flame The detection range of is out of the ignition rods 15 so that the current detection sensors in the ignition rods 15 do not detect the fine current in the flame, and thus the flame detection signal is not transmitted to the detector 33. .

If the detector 33 does not receive a current signal, the ignition rods 15 automatically generate a spark for about 10 seconds, and the detector 33 generates a current undetected signal to the control computer 39. The control computer 39 transmits an operation signal to the cylinder 21 of the moving unit 20 according to the internal control logic.

According to the operation signal, the cylinder 21 is activated and the shaft 22 moves in the right direction (see FIG. 7), and the traverse ring 11 coupled thereto moves in the right direction and the traverse ring 11 eventually. The radially coupled ignition rods 15 are moved to the right to detect the flame.

The control computer 39 moves the cylinder 21 to the right for a predetermined time and then to the opposite direction, so that the insulating ring 12 screwed with the traverse ring 11 is right. When moved to the right for a predetermined time to meet the touch ring 42 screwed to the right end of the combustion pipe 41, at this time the cylinder 21 is operated in the reverse direction, the insulating ring 12 is left Will be moved to.

The control computer 39 also stops the operation of the cylinder 21 when the ignition rods 15 detect a microcurrent while moving left and right, i.e., detect a flame.

Since the ignition rods 15 are radially mounted on the traverse ring 11, the flames can be easily detected even when the flame is inclined to one side, and are hardly bent or damaged by the high temperature of the flame.

The cylinder 21 is set to reciprocate the insulating ring 12 to the left and right for approximately 10 seconds, and the set time can be appropriately adjusted according to the peripheral equipment and the operating environment.

If the ignition rods 15 mounted on the traverse ring 11 detect the micro current in the flame during the operation of the cylinder 21, the current sensing signal is sent back to the control computer 39 through the detector 33. The control computer 39 transmits the operation stop signal to the cylinder 21.

The insulating ring 12 is guided by sliding the sliding groove (12a) is inserted into the departure prevention jaw (41a) of the combustion tube 41, and naturally moves to the left and right without twisting.

The control computer 39 receives the flame detection signal and transmits it to the cutoff valve 65 so that the cutoff valve 65 is completely opened, and the COG of the gas supply device 68 receives the gas supply pipe ( 55) and the main ignition is achieved by the auxiliary flame.

If the ignition rods 15 do not detect the flame even when the cylinder 21 is operated for the time set in the control computer 39 (for about 10 seconds), the undetected signal is again returned to the control computer ( 39, the control computer 39 moves the insulation ring 12 to an initial position through the operation of the cylinder 21, and sends a signal to the blocking side 65 to transmit the blocking side 65. To completely block the supply of COG to the gas supply pipe 55, and the flame in the auxiliary ignition device is incinerated.

When the auxiliary ignition device 100 needs to be extinguished due to a repair work or the like, the blocking side 65 is blocked and the ignition rods 15 are moved to an initial position to be in a standby state.

According to the series of actions as described above, the automatic flame detection of the auxiliary ignition device 100 is made automatically, and accordingly, main lighting and flame incineration are automatically performed.

As described above, according to the auxiliary ignition apparatus for flame detection according to the present invention, even if the length of the flame is changed according to the change of the mixed gas ratio and the air pressure in the auxiliary ignition apparatus, the flame is automatically detected and detected. Accordingly, the main ignition is facilitated to maintain a constant temperature in the annealing furnace at all times, thereby improving thermal efficiency, and thus improving the quality of the heat-treated product in the annealing furnace.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of Easily know.

Claims (5)

It is installed in the radiating tube of the annealing furnace and includes a gas supply pipe including a spray nozzle therein, a shutoff valve for blocking the gas supply to the gas supply pipe, a combustion pipe coupled to one side of the gas supply pipe and the current ignition power supply In the ignition device to be carried out, An ignition detection unit (10) including a plurality of ignition rods (15) installed radially movably on the combustion pipe (41) and having a current detection sensor therein; A moving unit 20 including a cylinder 21 for moving the ignition detecting unit 10; And Including the control unit 30 receives the current detection signal from the ignition detection unit 10 and transmits it to the moving unit 20 and the blocking side 65, Auxiliary ignition for flame detection, characterized in that the main ignition or flame incineration is automatically performed by controlling the operation of the moving unit 20 and the cut-off valve 65 in accordance with the current detection signal of the ignition detection unit (10). Device. The method of claim 1, The ignition detection unit 10 includes a traverse ring 11 in which the ignition rods 15 are radially mounted, and the traverse ring 11 has a periphery of the combustion tube 41 having a departure prevention jaw 41a formed on an outer circumferential surface thereof. Is screwed to the outer circumferential surface of the insulating ring 12 that is movably coupled along the separation preventing jaw (41a) through the sliding groove (12a) formed on the inner circumferential surface, the ignition rod 15 is the traverse ring (11) The insertion groove 11e formed in the through hole 12b formed in the insulating ring 12 and the slide hole 41b formed long in the combustion tube 41 extend to be disposed inside the combustion tube 41. Mounted on the traverse ring (11), Ignition and flame detection is facilitated by the ignition rods 15 arranged radially at regular intervals, the auxiliary ignition device for flame detection. The method of claim 1, The cylinder 21 of the moving part 20 is coupled to the side end of the shaft 22 screwed to the side plate 11a of the traverse ring 11 in which the ignition rods 15 are radially installed, and the control unit ( 30 is connected to the side plate (11a) is arranged in parallel with the shaft 22 and the electric rod 25 connected to the power source 31 is screwed, Auxiliary ignition device for detecting the flame, characterized in that for moving or stopping the traverse ring (11) in the lateral direction by the operation of the cylinder 21 in accordance with the signal of the control unit (30). The method of claim 3, wherein Insulated shaft 23 made of ceramic is inserted and coupled to the middle of the shaft 22, the shaft 22 and the electric rod 25 is coupled by an insulating ring 24 made of ceramic, The secondary ignition device for detecting the flame, characterized in that the discharge of the current is prevented by the insulating shaft 23 and the insulating ring (24). The method of claim 1, The controller 30 includes a detector 33 for detecting a current sensing signal of the ignition rods 15, a monitor 34 connected thereto and outputting a current sensing signal, and a control computer 39 connected thereto. The control computer 39 is connected to the moving unit 20 and the blocking side 65, If the detector 33 does not receive the current detection signal from the ignition detection unit 10, the moving unit 20 is operated, and if the continuous detection of the current detection signal for a predetermined time, the moving unit 20 is Auxiliary ignition device for detecting the flame, characterized in that for controlling the gas supply by stopping and operating the shut-off valve (65).

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