KR19990040394U - Ignition Burner for Annealing Furnace - Google Patents

Abstract

The present invention relates to an ignition burner for annealing furnace that is used to ignite an annealing furnace to determine the material of the metal by heat-treating the cold rolled steel sheet. In particular, the combustion efficiency is improved by improving the mixing of air and combustion gas, and the tip of the ignition burner. To prevent deterioration and damage, to stabilize flames to prevent backflow or extinguishment, and to improve the conductors that cause sparks by the ignition part to ensure stable flame detection at the initial temperature rise and normal operation of the annealing furnace. It is to maintain the temperature.

The present invention provides a combustion gas supply pipe in an air supply pipe, installs an electrode rod wrapped in an insulator therein, and installs a swirler in front of the electrode rod, and in a four-direction inward of the air supply pipe. In a conventional rod-type flame detector, a threaded portion is formed at the tip of the electrode, and a ring is fastened thereto, and a ring is connected to the electrode at the front of the ring, and a cone is formed at the tip of the electrode. The flame detector was formed by forming a mixed gas induction path in which the mixed gas is ejected at equal intervals along the circumferential direction.

Description

Ignition Burner for Annealing Furnace

The present invention relates to an ignition burner for annealing furnace for igniting an annealing furnace to determine the material of the metal by heat-treating the cold-rolled steel sheet, in particular, to improve the combustion efficiency by improving the mixing of air and combustion gas, deterioration of the tip of the ignition burner It prevents from being damaged, stabilizes flames, prevents backfire or extinguishment, and improves conductors causing sparks by the ignition part so that the flames are stably detected at the initial temperature rise of the annealing furnace and during normal operation, thus ensuring uniformity in the furnace. It is to maintain the temperature.

In general, the heat treatment equipment is equipped with an annealing furnace (annealing furnace) for heat-treating the steel sheet to determine the material of the metal. This annealing furnace heats the steel sheet to recrystallize the rolled structure and remove the internal stress to make the structure with appropriate toughness.

In other words, the annealing furnace recrystallizes and grows the rolled structure of the steel sheet to remove internal stress, and in order to deteriorate, it is heated to a predetermined temperature according to the carbon component and the additive element, and then maintained for a sufficient time and then cooled It is made of metal.

The annealing furnace is provided with a plurality of main banners 11 for heating the interior to a constant temperature. The main banners 11 are ignited and burned by a small burner called an ignition burner 12.

The ignition burner 12 (pilot burner) of the annealing furnace supplies combustion gas (Coke Oven Gas) and air to the radiant tube 10 to complete the ignition, and the main burner 11 (main burner). The combustion gas supplied to the combustion gas supply port 13 and the air in the atmosphere by the exhaust gas fan 14 are supplied through the air suction port 15 and then burned in the radiant pipe 10 and then discharged. After the preheating is performed in the heat exchanger 16 by the exhaust gas, the main man 11 is ignited, and heat is transferred by convection and radiation to the steel plate STRIP with heat generated by burning in the radiant pipe 10.

Here, the main manner 11 is improved and ignited and should be controlled according to the amount of combustion gas supplied to the main manner 11, but it has always been correlated with the ignition burner 12.

Accordingly, when the ignition burner 12 receives a signal that the ignition is ignited, combustion is performed by introducing the combustion gas from the main manor 11, and the main gas 11 is automatically extinguished by blocking the combustion gas when the ignition burner 12 extinguishes. Let's do it.

In such an automatic ignition system, the ignition burner 12 should always be ignited, but the material instability and lack of calories due to poor temperature control of the annealing furnace due to the automatic fire extinguishing of the main manor 11 due to the extinguishing of the ignition burner 12 during normal operation. In this case, the amount of combustion gas to be supplied to the unignition burner is excessively supplied with fuel to the ignition main manner (11), resulting in incomplete combustion due to insufficient air supply as much as the amount of fuel, resulting in a decrease in the life of the combustion device and environmental pollution. .

Combustion of the ignition burner 12 is the combustion gas supply pipe 17 is connected to the combustion gas supply pipe 17, the combustion gas is supplied, the air supply through the air supply pipe 18 of the air supply port at the same time the ignition burner ( 12) When the combustion gas and the air are mixed in the swirler 19 installed at the tip of the combustion gas pipe while fuel and air are supplied to the inside, and a predetermined voltage is supplied from the spark plug, the electrode 20 and the air supply pipe 18 The spark is generated by holding a gap of 2-3 mm with the conductor 22 installed in the inner diameter to ignite.

At this time, the insulator 21 protects the electrode 20 from being discharged at a high voltage and induces a spark at the end of the electrode 20.

The flow rate of combustion air and combustion gas supplied into the radiating pipe 10 is changed from time to time according to the working conditions. In particular, the combustion gas and air supplied are instantaneously dropped. When the pressure inside the chamber and radiating tube 10 is maintained at (-) and the combustion gas generated after combustion is released to the atmosphere, the flame length is increased and the flame length is formed at the tip of the conductor 22, and the flame length is instantaneously when the pressure is low. Is shortened so that the flame is not detected and the fuel supply to the ignition burner 12 and the main manner 11 is automatically shut off.

In addition, the electrode 20 is exposed to heat for a long time, causing sagging, unsaturation due to a gap defect with the conductor 22, and the conductor 22 also has a trapezoidal shape, resulting in deformation and dropping due to heat. Cause.

And the turner 19 is also installed on the outer diameter of the electrode 20, so when the sagging of the electrode 20 is not positioned vertically, sagging occurs in a specific direction is not ignited.

Ignition burner 12 Ignition occurs when spark is generated between the electrode rod 20 and the conductor 22 installed in the inner diameter of the air pipe when the S / W is turned on in the IGNITOR PANEL or the cab. (SPARK TIME ≒ 5-7 SEC '), the combustion gas and air are mixed in the swirler 19 and ignited by a spark spark.

When the ignition spark is formed between the electrode 20 (+) electrode and the inner (22) electrode of the inner side of the air supply pipe 18, the flame flame acts as a conductor 22 to ride the electrode 20. An electrical signal is generated through a transformer.

However, the fuel supply pressure changes according to various conditions such as the working condition, the conductor 22, and the deflection and deformation caused by the long time use of the electrode 20, and the inner diameter and the conductor of the electrode 20 and the air supply pipe 18. Even if a spark is not generated or a spark is generated due to a gap defect with (22), when the flame is not present between the electrode rod 20 and the inner diameter conductor 22 of the air supply pipe 18, the flame does not play a role of the conductor 22. Can not detect the ignition can not digest the main burner (11) and ignition burner (12).

The present invention improves the conductor from the conventional rod type to the conical type in order to prevent sparking and non-flame detection due to the deflection and dropping of the conventional electrode rod and the inner diameter of the air pipe conductor. After mixing, the fuel gas and air are mixed in the flame detector secondly, and the fuel gas and air are completely mixed and the spark is formed. Accordingly, the flame is formed and the flame forms the spark at the rear of the flame detector of the cone type. An ignition burner for annealing furnace that diffuses into the surrounding area and the surrounding space and is always sparked even when the flame changes according to the influence of the conventional unignition factor so that the flame can be detected smoothly. The purpose is to provide.

1 is a schematic diagram showing a general combustion control flow

2 is a partially cutaway perspective view of a conventional ignition burner for annealing furnace

Figure 3 is a cross-sectional view of a conventional ignition burner for annealing furnace

Figure 4 is a partial cutaway perspective view of the ignition burner for the annealing furnace of the present invention

5 is a cross-sectional configuration of the ignition burner for the annealing furnace of the present invention

<Description of the symbols for the main parts of the drawings>

10: copy tube 11: main burner

12: ignition burner 13: combustion gas supply port

14: exhaust gas fan 15: air intake

16 heat exchanger 17 combustion gas supply pipe

18: air supply pipe 19: turning machine

20.20a: electrode 21: insulator

22: conductor 23: threaded portion

24: ring 25: body

26: mixed gas induction furnace 27: flame detector

4 of the present invention is a partial cutaway perspective view of the ignition burner for the annealing furnace of the present invention, Figure 5 is a cross-sectional view of the ignition burner for the annealing furnace of the present invention.

In the present invention, the combustion gas supply pipe 17 is installed in the air supply pipe 18, and an electrode bar 20 wrapped with an insulator 21 is installed in the air supply pipe 18 so that the electrode bar 20 is connected to the insulator 21. To be protected.

In addition, the turner 19 was installed in front of the electrode rod 20, and the rod-type flame detector 27a was installed in four directions while maintaining equal intervals inside the air supply pipe 18. This is common.

Meanwhile, the present invention forms a threaded portion 23 at the distal end of the electrode rod 20, and the screw portion 23 is screwed to the ring 24, and the electrode rod 20a is screwed to the front of the ring 24. It was.

In addition, a flame detector (27) is formed at the tip of the electrode (20a) by forming a plurality of mixed gas induction paths (26) through which the mixed gas is ejected at equal intervals along the circumferential direction in the body (25) having a conical shape. It was done.

Referring to the operation of the present invention configured as described above are as follows.

In general, the electrode 20 is installed inside the insulator 21, and the flame detector 27 is installed at the end of the insulator 21, that is, the rear end of the electrode 20. The conventional conductor 22 part is manufactured by shrinking, and when the conductor part 22 falls out, the entire air supply pipe 18 must be replaced, and when the electrode bar 20 is deformed, the entire electrode bar 20 must be replaced. It costs a lot.

Therefore, in the present invention, the ring 25 is installed at the end of the insulator 21, that is, the electrode 20, and installs another electrode 20a at the end thereof, and serves as an inconel or conductor 22 resistant to high heat at its tip. Install the flame detector 27 made of a material that can be.

Therefore, only the flame detector 27 can be replaced when unignitioned due to an abnormal occurrence of the flame detector 27.

According to the present invention, even when the air supply pressure and the flue gas supply pressure are changed or the flame length is changed, the flame is always diffused to the outer diameter of the flame detector 27 and the inner diameter of the air supply pipe 18, so that the accurate detection of the flame and the smooth spark Formation, of course, prevents sagging of the electrode 20, and even if the flame detector 27 is oxidized and corroded, it is possible to induce complete ignition.

As described above, the present invention maintains proper clearance during flame exposure and oxidation corrosion of conductors forming sparks, and detects flames stably even when the combustion gas and air pressure and pressure discharged after combustion are stably minimized by ignition burner. As the main burner is ignited, the initial heating time is shortened and the combustion gas supply is kept the same in all the main burners even during normal operation to prevent soot suppression in the radiant pipe due to incomplete combustion, and to increase the service life and productivity of the equipment. There is an effect of reducing the number of ignition burner replacement.

Claims (1)

A combustion gas supply pipe 17 is installed in the air supply pipe 18, and an electrode rod 20 wrapped with an insulator 21 is installed therein, and a swirler 19 is provided in front of the electrode rod 20. In the conventional installation by installing a rod-type flame detector in four directions on the inner side of the air supply pipe (18), a threaded portion (23) is formed at the tip of the electrode (20), and thus the ring (24), but the front of the ring 24 is connected to the electrode rod (20a) and installed, the front end of the electrode (20a) is a mixed gas at equal intervals along the circumferential direction to the body 25 having a conical shape Ignition burner for annealing furnace, characterized in that by installing a flame detector 27 is formed by forming a mixed gas induction furnace 26 is ejected.