KR100380732B1 - Main burner having rotation member in annenling furnace - Google Patents

Abstract

PURPOSE: An annealing furnace main burner with rotator is provided to prevent damage of annealing line, suppress formation of non-burnt deposit and smoothly supply amount of heat by installing a fuel tube comprising inner and outer diameter rotators at the tip of gas pipe of the main burner. CONSTITUTION: The annealing furnace main burner(1) with rotator comprises a fixed support(10) which is fixed to the outer circumferential surface of gas pipe(6), and on one end of which a catching projection(12) is projectingly formed; an assembly nut part(20) clamped to the outer circumferential surface of the fixed support; a fuel tube(30) comprising an inner pipe(30a) which is connected to the tip of the assembly nut part, on which a fixing hole(31) is perforated, and on an inclination plane of which a plural first air inflow holes(33) are circumferentially perforated in such a way that outer diameter of the inclination plane of the inner pipe is gradually enlarged in an axial direction, an outer pipe(30b) which distributes preheated air led-in, and on an inclination plane(34a) of which a plural second air inflow holes(34) are circumferentially perforated in such a way that outer diameter of the inclination plane of the outer pipe is gradually enlarged in an axial direction, and a main body(30c) on outer surface and front inner surface of which inner and outer diameter rotators(36,37) are respectively installed, wherein the fuel tube is fixed to an assembly projection(6a) of the gas pipe; and a nozzle part which is mounted on the tip of the gas pipe, on an outer surface of which a plural diffusion holes(42) are slantly formed, and on the front center of which a straight hole(43) is perforated so that the nozzle part is positioned in an inner space of the fuel tube.

Description

MAIN BURNER HAVING ROTATION MEMBER IN ANNENLING FURNACE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main burner mounted in a radiant tube installed in an annealing furnace, and more particularly, pre-combustion air is firstly distributed to a nozzle side from which fuel gas is discharged, and secondly is distributed into a fuel tube where combustion is performed. And a preheating air that is turned as an outer diameter turner mounted on the outer diameter of the fuel tube and a combustion flame that turns as an inner turner meet each other to form a complete combustion condition by completely mixing the incompletely burned fuel gas. The main burner for the annealing furnace.

In general, annealing furnaces installed in steel making facilities are core equipments that determine the material of metals by heat-treating cold-rolled steel sheets as radiant heat.The annealing furnaces recrystallize and grow into a rolling structure by heating steel. It removes stress and makes tissue with proper toughness. That is, the annealing furnace is to maintain the heating time of the steel in accordance with a predetermined temperature according to the carbon component and the additive element in order to remove the softening of the internal stress of the steel, and then to cool it to produce a material of the metal desired by the demand .

The structure of the annealing furnace, that is, the heat treatment sequence, includes a preheating furnace section (section) for removing the rolling oil and foreign substances from the surface of the steel plate, a direct fired furnace for rapidly raising the temperature of the steel plate, a heating table for heating the steel plate, and It consists of a cracking stand which maintains the temperature of a steel plate uniformly, a slow cooling stand which gradually cools a steel plate, an overaging band for preventing the aging of a steel plate, and a quenching zone.

Meanwhile, the heating and cracking zones are called Radiant Tube Sections (RTS), and the main equipment of the radiant tube section is Coke Oven Gas (COG) supplied and mixed as shown in FIG. A main burner (1a) which burns combustion air to supply heat, and an auxiliary burner (2) which is a pilot burner which serves to ignite the main burner (1a), and the main burner It consists of a radiant tube (3) which conducts heat transfer to the steel sheet by convection and radiation of the exhaust gas combusted in (1a).

Here, the ignition of the main burner (1a) is made by the auxiliary burner (2) ignited by a spark (Spark) in the electric rod (Rod), the combustion air and fuel gas supplied is the main burner (1a) It is ignited while being mixed with each other around the base 8 attached to one end of the) to form a combustion flame which is a heating source at the end of the nozzle 9. As the combusted exhaust gas flows into the radiant pipe 3 and flows into the heat exchanger 4 side, the exhaust gas forcibly introduced from the heat and atmosphere of the exhaust gas combusted by the heat exchanger 4, which is an air preheater, is introduced. After phosphorus combustion air meets each other to exchange heat, the combusted exhaust gas is discharged to the chimney 5b through the exhaust gas pipe 5. In FIG. 1, reference numeral 5a denotes a dilution damper, 5c denotes a bellows tube in which exhaust gas is induced, 7 denotes a main burner body, 7a denotes a burner support, and 7b denotes a contact tube in which preheated air is induced. to be.

In addition, the supply of the combustion air required for the combustion flame operation of the main burner (1a) is made of a constant pressure by a fan (not shown) for suctioning the atmospheric air, the pipe by the flow rate adjusted by the flow valve (not shown) After the preheated heat exchanger (4) is made to be preheated to about 300 ~ 450 ℃ at atmospheric temperature. In addition, the supply of fuel gas is made according to the air-fuel ratio according to the air flow rate adjusted in the flow valve (not shown), and the burned exhaust gas is adapted to the suction pressure set in the suction blower (not shown). Through the atmosphere.

However, in order to secure sufficient calories during operation, complete combustion must be achieved by the complete mixing of combustion air and fuel gas, and the structure of the flame insulator 8 installed in the conventional main burner 1a becomes a problem and various incomplete combustion It is causing a factor.

Looking at the incomplete combustion factors of the main burner (1a), 1) the flow rate of the combustion air and fuel gas supplied to the radiation pipe (3), that is, the inlet pressure is changed according to the working conditions, in particular the pressure supplied 2) When the air-fuel ratio is defective while the air-fuel ratio is high or low, 2) When the exhaust gas suction pressure of the rear end of the radiating tube 3 changes according to the change of working conditions or the suction pressure rises to the positive pressure, 3) The main The flame insulator 8 structure of the burner 1a is diffused and combusted so that the incoming combustion air passes through the contact tube 7b and is simultaneously introduced into the place where the outer diameter of the radiator tube 3 is about 19 mm. 4) When the air-fuel ratio is poor due to simultaneous injection of combustion air, 4) When the main burner (1a) in the same area is extinguished, the supplied fuel gas is supplied to the ignited burner in a large quantity and exceeds the maximum flow rate. Wealth 5) At the time of occurrence, the suction pressure is fixed at a constant pressure at a low load where a small amount of supply of combustion air and fuel gas is introduced, and the incoming combustion air is spread to the floor after the radiant tube (3) is introduced and the flame sprayer (8) 1 While passing under / 3, fuel gas rises above the inner wall of the radiator tube 3, and is mainly generated when combustion occurs in the heat exchanger 4 because complete mixing of combustion air and fuel gas is impossible.

That is, the flame combusted from the flame insulator 8 of the main burner 1a by such various incomplete combustion factors, when the exhaust gas suction pressure is high, the preheated combustion air is laid on the bottom of the radiation pipe (3) Incomplete mixing and passing below 1/3 of (1), when hunting (when the output flows in and out of the flow rate flows in and out) The combustion air and the fuel gas were not mixed at all, and were mixed and burned in the vicinity of the heat exchanger 4 which is the rear end of the radiation tube 3.

In this case, the secondary burner is discharged inside the flue gas moving pipe 5 through which the flue gas is discharged, causing premature corrosion of the equipment, or the soot generated by incomplete mixing around the flame insulator 8. It shortens the lifespan and causes breakage and banding due to local heating of the radiation tube 3 due to incomplete combustion, which causes damage of the radiation tube 3, and an undeposited deposit is generated inside, which causes backfire. On the other hand, when the incompletely burned gas is second burned in the exhaust gas moving tube 5 to heat the pipe, carbon monoxide (CO) gas is contained in the exhaust gas components, thereby greatly causing environmental pollution.

Accordingly, damage to annealing equipment such as a burner body, a heat exchanger 4, an exhaust gas pipe 5, and a radiator tube 3 due to incomplete combustion due to incomplete mixing in the main flame burner 8 of the main burner 1a. It causes a decrease in lifespan, a large amount of harmful components such as carbon monoxide and nitrogen oxides are generated in the exhaust gas components, which increases air pollution, while it is impossible to secure enough heat due to incomplete combustion. There was a fatal problem that lowered the productivity.

Accordingly, the present invention has been made to solve such a conventional problem, and its object is to provide a fuel tube having an inner and outer diameter turner at the tip of the gas pipe of the main burner so that the combustion air and fuel are introduced without being affected by various incomplete combustion conditions. By completely mixing the gas to achieve complete combustion, it prevents the destruction of the annealing facility, suppresses the generation of unsediment deposits, improves the productivity by smoothly supplying the heat, and reduces the generation of harmful gases in the flue gas, greatly increasing air pollution. It is an object of the present invention to provide a main burner for annealing furnaces having a revolving turner.

1 is a block diagram showing a main burner for the annealing furnace according to the prior art,

Figure 2 is a longitudinal sectional view showing a main burner for the annealing furnace having a turner according to the present invention,

3 is an exploded perspective view showing a main burner for the annealing furnace having a turner according to the present invention;

4 is an exploded cross-sectional view showing a main burner for the annealing furnace having a swirler according to the present invention;

Figure 5 is a front view showing the combustion tube of the main burner for the annealing furnace having a swirler according to the present invention.

Explanation of symbols on the main parts of the drawings

3 .... radiant tube 4 .... heat exchanger

10 .... Fixed Support 12 .... Hanging Jaw

20 .... Assembled nut part 30 .... Fuel tube

30a ..... Interior 30b ..... Appearance

30c ..... Body 31 .... fixing hole

33 .... 1st air inlet hole 33a, 34a ..... slope

34 .... 2nd Air Inlet Hole 36 ..... Outer Diameter Turning Machine

36a, 37a ..... turning wing 37 ..... inner turning machine

40 ..... Nozzle part 42 ..... Diffusion hole

The present invention as a technical configuration for achieving the above object,

In an annealing facility comprising a gas pipe for supplying fuel gas, an auxiliary burner serving as an ignition source, a radiating tube for conducting heat transfer to the steel sheet by convection and radiation of the combusted exhaust gas, and a heat exchanger for preheating the outside air,

A fixed support fixed to an outer circumferential surface of the gas pipe and protruding a locking step at one end thereof;

An assembly nut part which is fastened and fixed to an outer circumferential surface of the fixing support;

It is connected to the distal end of the assembling nut, punctures the fixing hole, and distributes the inner tube and the preheated air that is formed in the circumferential direction of the plurality of primary air inlet holes on the inclined surface gradually increasing in outer diameter in the axial direction, Assembly of the gas pipe with an external appearance of a plurality of secondary air inlet holes in the circumferential direction on the inclined surface gradually increasing in the axial direction, and a main body provided on the outer surface and the inner surface of the distal end of the inner and outer diameter turners. A fuel tube fixed to the; And

An annealing furnace having a swirler, which is mounted at the tip of the gas pipe and has a plurality of diffusion holes inclined on an outer surface thereof and perforations a straight hole in the front center thereof and is located in the fuel tube inner space. By preparing a main burner.

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

Figure 2 is a longitudinal sectional view showing a main burner for the annealing furnace having a swirler according to the present invention, Figure 3 is an exploded perspective view showing a main burner for the annealing furnace having a swirler according to the present invention, Figure 4 is 5 is an exploded cross-sectional view showing a main burner for annealing furnace having a swirler, and FIG. 5 is a front view showing a combustion tube of the main burner for annealing furnace having a swirler according to the present invention.

The main burner (1) for the annealing furnace having a swirler according to the present invention, as shown in Figs. 2 to 5, inside the radiant pipe (3) to completely mix the preheated combustion air and the fuel gas introduced therethrough. The main burner 1 is installed at the gas pipe 6 to which fuel gas is supplied, the fixed support 10, the assembly nut part 20, the fuel tube 30, the nozzle part 40, and the like. It is composed.

That is, the hollow support cylindrical fixing support 10 is fixed to the outer surface of the gas pipe (6) forms a male screw portion 11 on the outer surface of the body, and protruding the locking step 12 at the tip. In addition, the hollow nut cylindrical assembly nut part 20 fixed to the outer circumferential surface of the fixing support 10 is fastened to the female screw part 21 fastened to the male screw part 11 and the fuel tube 30 to be described later. Another female screw portion 22 is formed on the inner circumferential surface of the line and the rear end, respectively.

In addition, the fuel tube 30 is assembled to the assembling nut part 20 so as to be installed at the tip of the gas pipe 6, and the fuel tube 30 fixed to the assembling jaw 6a of the gas pipe 6 is an inner tube 30a. , The outer body 30b and the body 30c are integrally configured, such an inner tube 30a has a male screw part 32 coupled to the female screw part 22 of the inner circumferential surface of the distal end of the assembly nut part 20 at a rear end thereof. It is formed through the fixing hole 31 is assembled to the fastening member (31a) so that the flow is not possible after assembly, the primary air inlet hole 33 at regular intervals on the inclined surface (33a) the outer diameter gradually increases in the axial direction Perforations are formed in the circumferential direction.

In addition, the exterior 30b extends longer than the extension length of the inner tube 30a, is provided with a size larger than its diameter, and the secondary air inflow hole at regular intervals on the inclined surface 34a in which the outer diameter gradually increases in the axial direction. A plurality of holes (34) are drilled in the circumferential direction. Accordingly, the preheated and introduced combustion air is distributed and introduced into the primary air inlet hole 33 through the outer circumferential surface of the inner tube 30a and the inner circumferential surface of the outer shell 30b, and the outer shell 30b. It is distributed into the secondary air inlet hole (34) between the outer circumferential surface of the) and the inner circumferential surface of the radiation tube (3) and completely mixed with the fuel gas in the fuel tube (30).

On the other hand, the outer surface of the body having the largest outer diameter (30c) a plurality of at regular intervals to turn in one direction preheating air that has not been distributed into the interior through the first and second air inlet holes 33, 34 The outer turning rotor 36 equipped with two turning blades 36a in the circumferential direction has a plurality of turning wings at predetermined intervals so as to rotate the combustion flame of the complexed fuel gas in one direction on the inner surface of the narrowed tip ( The inner diameter turner 37 which mounted 37a) in the circumferential direction is provided and comprised. At this time, the turning blade (37a) of the inner diameter turning machine 37 of the outer diameter turning machine (36) so that the combustion flame and the secondary preheating air is completely mixed with each other at the discharge side of the fuel tube (30) and completely burned. It is good to be provided in the opposite direction from the turning blade 36a.

In addition, the nozzle portion 40, which is assembled at the tip of the gas pipe 6 and located in the internal space of the fuel tube 30, has a male screw portion 41 at one end thereof, and radiates a combustion flame complexed on the outer circumferential surface thereof. A plurality of diffusion holes 42 are formed to be inclined so as to be discharged in a straight line, and a straight hole 43 is formed in the front center so as to discharge the combustion flames in a straight line.

Referring to the operation and effects of the main burner for the annealing furnace having a swirler having the configuration as described above are as follows.

That is, the fuel tube is installed so that the nozzle portion 40 is located in the inner space of the assembly nut 20 and the assembly nut 20 installed on the fixed support 10 of the gas pipe (6) to which the fuel gas is supplied. When performing the operation of determining the material of the steel sheet by using the radiant heat generated during ignition of the main burner (1) for the annealing furnace consisting of (30), first, atmospheric air forcedly supplied by a fan (not shown) When heat is exchanged in a heat exchanger (4) installed inside the radiant pipe (3), and is preheated to a predetermined temperature, and then supplied to the radiant pipe (3), the fuel gas is also supplied to the preheated combustion air introduced by the set flow rate. It is supplied simultaneously through 6).

Accordingly, as shown in FIG. 2, the preheated combustion air forced into the air is distributed to the primary preheating air and the secondary preheating air by the exterior 30b of the fuel tube 30 serving as the distributor. That is, the primary preheating air distributed between the inner surface of the outer tube 30b and the outer surface of the inner tube 30a is connected to the fuel tube through the primary air inlet hole 33 formed in the inclined surface 33a of the inner tube 30a. 30, the secondary preheated air introduced into the outer surface of the outer surface 30b and the inner surface of the radiation tube 3 at the same time is formed in the plurality of secondary air inlet holes formed on the inclined surface 34a of the outer surface 30b. It is introduced into the fuel tube 30 through the 34. At this time, when ignition is performed using the auxiliary burner 2 as the ignition source, the fuel gas supplied through the gas pipe 6 and diffused radially widely through the diffusion hole 42 of the nozzle unit 40 is 1 Combustion is primarily performed while mixing with combustion air, which is primary preheating air, distributed and introduced through the secondary air inlet hole 33.

Subsequently, the fuel gas discharged in a straight line through the straight hole 43 of the nozzle unit 40 is smoothly mixed with combustion air, which is secondary preheating air, distributed and introduced through the secondary air inlet hole 34. As described above, the combustion occurs secondarily to meet the primary combustion flame formed during the primary combustion and to promote complete combustion. At this time, inside the body 30c of the fuel tube 30, the primary and secondary combustion flames are formed to form a combustion flame concentrating portion that concentrates the flames.

Meanwhile, the third preheating air, which is some combustion air that has not been introduced into the fuel tube 30 through the first and second air inflow holes 33 and 34 of the inner and outer tubes 30a and 30b, is the largest. The flame that is rotated in one direction while passing through the turning blades 36a of the outer diameter turning machine 36 installed on the outer surface of the body 30c having an outer diameter, and burned and ignited in the fuel tube 30 is discharged forward. The preheated air and the combustion flame are rotated in the direction opposite to the turning direction of the tertiary preheating air while passing through the turning vanes 37a of the inner diameter turning machine 37 provided on the reduced tip inner circumferential surface. On the discharge side of the mixture to meet each other to promote complete combustion. Accordingly, the third combustion is performed by finally mixing the combustion air and the fuel gas which have not been burned to the discharge end of the fuel tube 30 to each other, thereby reducing the amount of heat and generating incomplete combustion factors that generate harmful gases. All can be removed.

Then, annealing heat treatment is performed to determine the structure of the steel sheet by transferring heat to the steel sheet which proceeds by providing a heat source to the radiation tube 3 as a combustion flame generated inside and outside the fuel tube 30. In addition, the combusted exhaust gas passes through the heat exchanger (4) to exchange heat with the sucked atmospheric air, and is finally discharged to the outside through the exhaust gas transfer pipe (5).

As described above, according to the main burner for the annealing furnace having the swirler according to the present invention, the combustion air is completely mixed with the primary and secondary preheating air introduced through the primary and secondary air inflow holes 33 and 34. At the same time as the combustion in the fuel tube 30, the third preheated air that is turned by the outer diameter turner 36 meets each other at the combustion flame and the discharge side that is turned by the inner turner 37 to finally promote complete mixing. By complete combustion, it is possible to secure enough heat to improve productivity, to adjust the proper temperature of the annealing furnace during operation, to suppress the generation of undeposited deposits, and to heat exchange according to incomplete combustion as in the prior art. Prevents damage to the annealing equipment such as gas and piping to enable stable operation of the equipment, while minimizing the generation of harmful substances such as carbon monoxide and nitrogen oxides in the exhaust gas, thereby minimizing air pollution. The effect of remarkably reducing this is obtained.

Claims (2)

A gas pipe 6 for supplying fuel gas, an auxiliary burner 2 serving as an ignition source, a radiant pipe 3 for conducting heat transfer to the steel sheet by convection and radiation of the combusted exhaust gas, and a heat exchanger 4 for preheating the outside air. In the annealing equipment consisting of A fixed support 10 fixed to an outer circumferential surface of the gas pipe 6 and protruding a locking jaw 12 at one end thereof; An assembly nut part 20 fixed to the outer circumferential surface of the fixing support 10; A plurality of primary air inlet holes 33 in the circumferential direction are connected to the distal end of the assembling nut part 20, puncturing the fixing hole 31, and the inclined surface 33a in which the outer diameter is gradually increased in the axial direction. An outer casing 30b in which a plurality of secondary air inflow holes 34 are circumferentially laid on the inclined surface 34a which distributes the laid inner pipe 30a and the incoming preheating air and gradually increases in outer diameter in the axial direction; And a fuel tube 30 having a main body 30c having inner and outer diameter turners 36 and 37 installed on the outer surface and the inner surface of the tip, respectively, and fixed to the assembly jaw 6a of the gas pipe 6. ; And It is mounted to the tip of the gas pipe 6, a plurality of diffusion holes 42 are formed to be inclined on the outer surface, and the nozzle portion located in the inner space of the fuel tube 30 by drilling a straight hole 43 in the front center Main burner for annealing furnace having a swirler, characterized in that it comprises a (40). According to claim 1, The inner and outer diameter turning machine 36, 37 for the annealing furnace having a turner, characterized in that a plurality of turning wings 36a, 37a in the opposite direction are formed at regular intervals, respectively. State burner.