KR20020039385A - Burner for having a capacity of enhanced heating - Google Patents

Abstract

PURPOSE: A uniformed heating type burner is provided which is capable of preventing alloying deviation generated on the surface of the strip by uniformly distributing a flame ejected on a strip along a full width of the strip, thereby preventing quality defects due to generation of the alloying deviation on the surface of the strip. CONSTITUTION: In a burner which directly heating the surface of a strip(S) that is zinc coated in a heat protecting truck(122) after coating zinc on the surface of the strip(S) during galvanizing, the uniformed heating type burner is characterized in that a plural casings(10) which are extended in a width direction of the strip(S) and oppositely arranged each other are installed at the inner side of a housing(122a) of the heat protecting truck(122), a fuel gas and air are supplied into the casings(10), stirring means(20) capable of uniformly mixing the fuel and air are installed inside the casings(10), and a knife type nozzle is formed at the front part of the casing(10) so that a curtain type flame is ejected into the side of the strip(S).

Description

BURNER FOR HAVING A CAPACITY OF ENHANCED HEATING}

The present invention relates to a burner that performs a heating operation by direct heating method on the surface of the zinc coated strip in the heating bogie, after performing a zinc coating on the strip surface during the galvanizing operation, more specifically the flame sprayed into the strip By uniformizing over the entire width of the strip relates to a burner of a uniform heating method that can prevent the quality defects caused by the alloying deviation of the strip surface to prevent the alloying deviation occurring on the strip surface.

In general, the galvanizing process, as shown in Figure 1, the plating bath 110 is located at the rear end of the heating furnace 100 is made of zinc plating on the strip (S), to control the galvanizing thickness to the upper side The plating amount controller 112 is positioned, and the upper side is equipped with a heat balance truck 122 having a plurality of burners 120 to heat the strip S. Then, the upper end side has a structure in which no load 130 or the like is disposed so that the strip S is continuously galvanized.

Good quality strip (S) manufacturing requirements of Ga material produced in the galvanization process (Galvannealed), the plating bath lead strip (S) temperature, the amount of Al in the plating bath, alloying temperature and time, steel components, plating thickness, etc. There is, the heat treatment should be made in the range that the alloy layer is not produced. In particular, the Al concentration in the plating bath is controlled to be lower than the Al concentration in the GI material in order to promote the alloying reaction, and in the case of the rapid heating furnace in which the cracking zone and the cooling zone are not provided, it is to be avoided to overalloy.

In order to make a phase structure excellent in powdering resistance in such a Ga material, it is necessary to select appropriate alloying conditions. The alloy image structure is affected by the addition element of ferrous iron, but generally, the alloy has good powder resistance when the Al concentration is increased in the plating bath, the alloying treatment is performed at low temperature, and the plating bath temperature is lowered to select an appropriate alloying speed. You can get a floor.

The alloying hot-dip galvanized steel sheet of such a GA operation is a steel sheet alloyed by thermally diffusing a ferrous iron 'Fe' into a zinc-plated layer on the surface of the steel sheet heated by heating the hot-dip galvanized steel sheet at an appropriate temperature. It has excellent paintability and corrosion resistance after painting and is used for home appliances, building materials and automobile steel plates.

In the process of manufacturing a Ga-plated steel sheet as described above, the burners 120 provided in the conventional thermal balance trolley 122 may move the housing 125 of the thermal balance trolley 122 as shown in FIGS. 2 and 3. A plurality of burner tips 127 are mounted through both sides, and the gas supply pipes 128 of the hollow pipe member are connected to the burner tips 127, respectively, and the COG gas pipes 129a are connected to the gas supply pipes 128. ) And an air pipe 129b are connected to supply fuel gas and air media.

However, in the conventional working method as described above, the flame length of each burner 120 which is directly heated on the surface of the strip S which is in progress during the work of the GA material is unevenly generated, thereby compensating the temperature by the heat balance 122. This becomes unstable. The reason is that the fuel gas and the air must be uniformly mixed and injected in the gas supply pipe 128, but the mixing ratio of the conventional burners is not constant due to the pressure hunting of the fuel gas and the air, and they are properly mixed. The problem is caused by not having the means to stir.

FIG. 7 is a graph showing Al% in the plating bath and Fe% in the plating layer according to the alloying temperature change in the Ti-Nb-added ultra low carbon steel.

It can be seen that as the Al% decrease of the plating Pot in the plating layer, the factor of the alloying temperature increase is also increased, but the direct and indirect most sensitively affecting the alloying reaction depends on the non-uniform flame of the burner. In addition, when the alloying temperature increases, the rate of diffusion of Fe, which is the base iron, into Zn increases, so that alloying is rapidly performed in the plating layer, and as the Fe content increases, the alloying deviation is severely generated. In this way, quality defects in which alloying is unevenly formed on the surface of the GA steel sheet are generated.

As described above, the burner 120 of the conventional heating method is due to unalloyed generation due to uneven strip S heating during the strip alloying operation of the galvanizing process and due to the flame instability of the burner 120. Intensive heating in a particular place has a problem that a heating imbalance (Buckle) phenomenon occurs in that portion.

The present invention has been made to solve the conventional problems as described above, its purpose is to maintain a constant flame during the alloying operation of the Ga material, so that the temperature control in the heat balance to maintain a constant without hunting preheating due to poor temperature control It is to provide a burner of a uniform heating method to prevent the occurrence of insufficient alloying deviation and thereby prevent heating imbalance due to overheating, and to increase the alloying powdering property to produce high quality products.

1 is a side view showing a schematic structure of a general galvanizing facility;

2 is an external configuration diagram illustrating a heating furnace of a zinc plating apparatus according to the prior art;

3 is a cross-sectional view taken along the line A-A of FIG. 2, illustrating a heating furnace according to the prior art;

Figure 4 is a side view of a partially cut burner of the uniform heating method according to the invention mounted on the furnace;

Figure 5 is a perspective view showing in detail the burner of the uniform heating method according to the present invention;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5, illustrating an burner of a uniform heating method according to the present invention; FIG.

7 is a graph showing the correlation of Fe% in the plating layer according to Al% and alloying temperature in the galvanizing process

8 is a diagram showing the amount of gas and air according to the strip speed, and the rotation speed of the rotary blade.

Explanation of symbols on the main parts of the drawings

10 ..... Casing 20 ..... Stirring means

22 ..... rotary shaft 24 ..... rotary blade

26 ..... Bearing 28 ..... Motor

30 ..... Nozzle 35 ..... Flame

40 ..... air supply pipe 42 ..... gas pipe

50a, 50b ... Automatically Opening and Closing Valves

70 ..... Control terminal 110 ... Plating bath

122 .... thermos

In order to achieve the above object, the present invention, after performing a zinc coating on the surface of the strip during the galvanizing operation, in the burner to perform a heating operation by direct heating method on the surface of the zinc-coated strip in the bogie, The casing includes a plurality of casings extending in the width direction of the strip and arranged opposite to each other inside the housing of the tropical car, wherein the casing is provided with a stirring means capable of uniformly mixing fuel gas and air, Is to provide a burner of a uniform heating method, characterized in that to form a knife-shaped injection port in the tip portion to inject the curtain flame to the strip side.

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

The burner 1 of the uniform heating method according to the present invention is a burner which performs heating by direct heating on the surface of the zinc-coated strip S in the heat balance truck 122 as shown in FIG. 5. . The burner 1 of the present invention has a plurality of casings 10 extending in the width direction of the strip S and disposed opposite to each other in the housing 122a of the heat balance trolley 122, and in the casing 10. Each is supplied with fuel gas and air, it has a stirring means 20 that can be uniformly mixed. In addition, the casing 10 is configured to spray the curtain flame (35) to the strip (S) side by forming a knife-shaped injection port 30 in its front end, respectively.

In the present invention, since the casing 10 and all components connected to the casing 10 are arranged to be opposed to each other about the strip S, the following description will be given in more detail with respect to any one of them in order to simplify the description. The same reference numerals are used to denote the same. However, we can see that they will all work equally.

The casings 10 are completely fixed to the housing 122a of both sides of the heat balance trolley 122 by a bracket (not shown) around the strip S, and the air supply pipe 40 at the upper front side of the casing 10. ) And the COG gas pipe 42, each of the air supply pipe 40 and the gas pipe 42 is divided into 10 locations and extends through the top of the casing 10 to the inside of the casing 10, and the air supply pipe ( 40 and the front end of the COG gas pipe 42 are provided with automatic opening and closing valves 50a, 50b and the like each having automatic control valves.

In addition, an ignition switch 52, a connection pipe 54, and an ignition rod 56 are installed at the upper end of the casing 10 for the ignition operation, and the combustion gas and air are stirred and mixed inside the casing 10. The stirring means 20 is provided to the bar, the stirring means 20 is connected to the rotary blades 24 to the rotary shaft 22, the rotary shaft 22 is fixed to the circular bearing 26 casing (10) It is fixedly mounted on both sides, and then the rotary shaft 22 extends outward of the casing 10 and is connected to the shaft of the reducer motor 28. In addition, the rear end of the motor 28 is equipped with a rotation controller 29 which is a data value transmission and reception device in the control terminal 70 for speed adjustment.

On the other hand, the casing 10 is a tip portion toward the strip (S) forms a knife-shaped injection port 30, the knife-shaped injection port 30 is to form a predetermined gap in the longitudinal direction of the casing 10, Through the injection port 30, a mixture of combustion air and air is sprayed continuously like a curtain. This is the fuel gas and air are injected in a uniformly mixed state by the rotation of the rotary blades 24 of the stirring means 20.

The control terminal 70 is electrically connected to remotely operate the automatic control valves 50a and 50b, the driving motor 28, and the ignition switch 52.

The operation and effects of the present invention configured as described above are as follows.

In case of GA reworking, COG and air mixing ratio is adjusted in the range of 1: 5 ratio for smooth alloying operation. As shown in FIG. 8 a), when a data value corresponding to the COG gas and air ratio is set (SET) and transmitted to the control terminal 70 according to the traveling speed of the strip S, it is based on this value. The COG automatic regulating valve 51b and the air automatic regulating valve 51a are automatically adjusted in accordance with the ratio, and the automatic valves 50a and 50b are automatically adjusted in accordance with the data values, and the ignition switch 52 is started. It is transmitted to the ignition rod 56 through 54, and the ignition operation (flame formation) is performed to the casing 10. FIG.

In addition, the rotation controller 24 mounted on the rear end of the reduction gear motor 28 is equipped with a rotary blade 24 of the rotary shaft 22 installed at the rear end of the casing 10 in accordance with the speed of the strip S. The control terminal 70 The motor 28 rotates at the same speed as b) of FIG. 8 according to the indicated value, and while the rotary blade 24 rotates, the flame flame 35 of the casing 10 is sprayed.

In this case, the COG gas and the air supplied through the air supply pipe 40 and the gas pipe 42 are uniformly mixed by the rotary blade 24 which is stirred in the casing 10, and through the knife-type injection hole 30. Sprayed to the side of the strip (S), is ignited by the ignition rod 56 is the flame 35 is to be injected.

According to the present invention as described above, the unalloyed alloy due to the non-uniform strip (S) heating generated during the strip (S) alloying operation is prevented, the knife flame 35 from the casing 10 is sprayed to the strip (S) side As a result, the strip S is uniformly heated, whereby the effect of obtaining a good alloying quality product is obtained. At the same time, by maintaining the temperature control in the heat balance (122) without hunting, to prevent the occurrence of alloying deviation of the preheating shortage due to the poor temperature control and to prevent the heating imbalance due to a certain part overheating, thereby increasing the alloying powdering properties Can produce high quality products.

Claims (3)

In the burner which performs a zinc coating on the surface of the strip (S) during the galvanizing operation, and performs a heating operation by direct heating method on the surface of the zinc-coated strip (S) in the heat balance truck 122, The casing 10 extends in the width direction of the strip S and is disposed in the housing 122a of the heat insulating trolley 122, and the casing 10 is supplied with fuel gas and air. While having a stirring means 20 that can be mixed uniformly, the casing 10 to form a knife-shaped injection port 30 in the front end to inject the curtain flame 35 to the strip (S) side Burner of uniform heating method, characterized in that configured. According to claim 1, wherein the stirring means 20 is connected to the rotary blades 24 to the inner rotary shaft 22 of the casing 10, the rotary shaft 22 is fixed to the circular bearing 26 and the casing (10) It is fixed to both sides, the rotary shaft 22 passes through the circular bearing 26 to the outside of the casing 10, and is connected to the shaft of the reducer motor 28, the rear end of the motor 28 The burner of the uniform heating method, characterized in that the rotation controller 29 which is a data value transmission and reception device is mounted on the control terminal 70 for speed adjustment. The method of claim 1, wherein the knife-shaped injection port 30 is formed by forming a predetermined gap in the longitudinal direction of the casing 10, through the injection port 30, a mixture of combustion air and air in the flame-like curtain 35 The burner of the uniform heating method characterized in that the spray is formed continuously.