KR20060072358A - Plate type heating apparatus for continuous annealing furnace having the same - Google Patents

Abstract

A flat plate heater and a continuous annealing furnace having the same are provided.

The flat plate heating apparatus of the present invention includes a hot plate means having a vacuum inside and filled with a phase change material, an electric heat fin means for providing heat transfer while being provided on an outer side of the hot plate means, and adjacent to the electric heat fin means. An annealing furnace body in which a continuous steel sheet continuously passes in a multi-loop form, and a plurality of flat plate heaters installed in the longitudinal direction of the annealing furnace body. The inner space of the furnace body is separated into an annealing chamber in which annealing of the combustion chamber and the continuous steel sheet is performed by the wall means of the heating apparatus.

Such a flat plate heating apparatus of the present invention not only increases the heating efficiency of the continuous steel sheet but also increases the heating efficiency, and stabilizes the combustion system of the heating apparatus and the continuous annealing furnace, and in particular, independently of the combustion chamber of the continuous annealing furnace. In the construction, a heating device, which is a flat plate type heat transfer medium, is installed between the combustion chamber and the annealing chamber through which the continuous steel sheet passes, so that smooth heat exchange between the heat transfer medium and the continuous steel sheet is achieved, thereby improving the annealing quality of the entire steel sheet.

Continuous steel sheet, continuous annealing furnace, flat plate heating device, combustion chamber, annealing chamber

Description

Plate Type Heating Apparatus for Continuous Annealing Furnace Having The Same}             

1 is a schematic diagram showing an annealing process of a continuous steel sheet

Figure 2 is a schematic diagram showing a state of performing annealing of the continuous steel sheet using a conventional radiation tube

Figure 3 is a perspective view showing the overall configuration of a flat plate heating apparatus according to the present invention

4 is a structural diagram of FIG. 3,

(a) is a side structure diagram

(b) is a plan view

(c) is a front view

5 is an overall configuration diagram showing a continuous annealing furnace having a flat plate heating apparatus of the present invention.

6 is a side configuration diagram of FIG.

Explanation of symbols on the main parts of the drawings

1 .... Flat plate heater 10 .... Hot plate means

12 .... Phase change material 20 .... Heating fin means                 

30 .... combustion means 40 .... wall means

50 .... Moses means 100 .... Continuous annealing furnace

110 .... Annealing furnace body 120 .... Combustion chamber

130 .... Annealing chamber A1 .... Heating space

A2 .... combustion space

The present invention relates to a flat plate heating device and a continuous annealing furnace having the same, and more particularly to uniform heating of the continuous steel sheet, as well as to increase the heating efficiency, and to stabilize the combustion system of the heating device and the continuous annealing furnace. In particular, while the combustion chamber of the continuous annealing furnace is constructed independently, a heating device, which is a flat plate type heating medium, is installed between the combustion chamber and the annealing chamber through which the continuous steel sheet passes, so that the heat exchange medium and the continuous steel sheet are smoothly exchanged, thereby improving the overall annealing quality of the steel sheet. It relates to a flat plate heater and a continuous annealing furnace having the same.

A facility for heat-treating a continuous steel sheet in which a process such as annealing is performed while the steel sheet is continuously moved is called a continuous annealing furnace, and this conventional continuous annealing furnace is schematically illustrated in FIG. 1.                         

That is, as shown in Figure 1, the continuous steel sheet (S) is a heating zone 210 and crack zone 220, the first 1-3 cooling zone 230 and the water cooling zone 232 of the continuous annealing furnace 200. Processed while passing.

At this time, the temperature of the steel sheet heat-treated in the heating zone 210 and the crack zone 220 of the continuous annealing furnace 200 is raised to a recrystallization temperature of approximately 800 ℃, in this way the steel sheet (S) 800 ℃ in an anoxic atmosphere In order to heat up to use the indirect heating type radiation apparatus shown in detail in FIG.

That is, as shown in Figure 2, in the conventional continuous annealing furnace 200, a facility for substantially heating (annealing) the continuous steel sheet (S) is a copying device 240, which heats the steel sheet using radiant heat It is an indirect heating device.

On the other hand, as shown in Figure 2, the conventional copying apparatus 240 used in the continuous annealing furnace 200 is provided with a radiation tube 242, which is usually installed in the W-type, one side of such a radiation tube 242 The burner 244 which supplies the air and fuel which has a temperature of about 400 degreeC, and combusts by a predetermined ratio is installed, and heats the inside of the radiation tube 242.

Therefore, the continuous steel sheet S passing close to the radiation tube 242 by the radiant heat radiated from the heated radiation tube 242 during combustion of the burner is heated in an indirect manner.

On the other hand, the hot gas generated during combustion is discharged to the atmosphere at a temperature of approximately 500 ~ 600 ℃ through a heat exchanger (not shown) installed in the rear end of the radiation tube 242.

At this time, as shown in Figure 2, the burner combustion in the radiation pipe 242 is mainly generated in the first straight pipe portion 242a of the radiation pipe, so the temperature of the straight pipe portion 242a is the highest, and toward the rear end The temperature drops.

As a result, in the continuous annealing furnace 200 of the indirect heating method using the conventional radiation tube 242, the oxidation pipe or heat deformation of the straight tube portion 242a of the radiation tube 242 is easily generated due to high temperature, Due to this, there is a problem in that the maintenance cost of the equipment is increased while the radiant pipe needs to be replaced frequently.

In addition, the continuous annealing furnace 200 according to the conventional indirect method has another problem that the thermal efficiency is substantially low because the annealing of the steel sheet proceeds by radiant heat.

On the other hand, in order to solve the problems caused by the use of the radiation tube, the technique of using a material with high heat and oxidation resistance of the straight pipe portion 242a which is a high temperature portion of the radiation tube 242 or to prevent local overheating through multi-stage combustion This is applied but it does not solve the fundamental problem.

In addition, in the conventional radiation tube type heating apparatus 240 shown in FIG. 2, the diameter of the radiation tube 242 is about 190 to 200 mm, and as the use of the radiation tube is prolonged, As tar and other contaminants accumulate on various resistance elements (not shown) for recovery of the installed heat, severely block the exhaust passage of the exhaust gas, which causes other problems that make the combustion system and the whole operation unstable. It is becoming.

When the continuous steel sheet is moved by using the radiation tube 242, the steel sheet is mainly heated by radiant heat radiated from a high-temperature radiation tube, so that the radiation exchange area between the radiation tube 242 and the steel sheet S is increased. The larger the value, the more efficiently the steel sheet can be heated. When heating the steel sheet using the conventional radiation tube 242, there is a region where the radiant energy radiated from the radiation tube cannot reach the steel sheet, which reduces the heating efficiency of the steel sheet, In addition to thermal efficiency, another problem arises that the temperature uniformity of the steel sheet being heated is not constant.

That is, the radiation tube continues to fall until the temperature of the exhaust gas passing through the tube is exhausted, so that a significant temperature deviation occurs in the width direction of the steel plate and the surface temperature of the radiation tube, and eventually the heating is uneven in the width direction of the steel plate. Non-uniform internal stress of the steel sheet is acting, this variation of the internal stress of the steel sheet causes plastic deformation of the steel sheet, causing severe interruption of operation, as well as meandering occurs when the steel sheet is not progressing normally.

Accordingly, it would be more desirable to provide a plate-type heating apparatus using a metal plate assembly having a low occurrence of cracks and the like, as a heat transfer medium, and a continuous annealing furnace having the same.

SUMMARY OF THE INVENTION The present invention has been made to improve the above-mentioned problems, and the object thereof is to use a plate-type heat transfer medium instead of a radiation tube type, and thus, to solve various problems occurring in the radiation tube, in particular, It is to provide a flat type heating device which has less local cracking or damage, prolongs its service life, and prevents uneven heating, thereby increasing the overall heating efficiency.                         

Further, by performing continuous annealing of the continuous steel sheet using the flat plate heating device, while stably controlling the entire combustion system, in particular, by eliminating the uneven heating pattern in the steel plate width direction of the continuous steel sheet, the annealing of the entire continuous steel sheet An object of the present invention is to provide a continuous annealing furnace having a flat plate heating device which improves the annealing quality of a steel sheet while improving operability.

As a technical aspect of the present invention for achieving the above object, the present invention comprises a hot plate means filled with a phase change material in a vacuum state;

An electrothermal fin means for providing heat to the heat plate while being provided on an outer side of the hot plate means; And,

Combustion means disposed adjacent to the heat transfer fin means;

It provides a plate-type heating device configured to heat the metal body disposed or close to the hot plate means, including.

In this case, the heating fin means and the heating means may further include a wall means for separating the space between the heating light and the combustion space, respectively.

In addition, the hot plate means is composed of a rectangular body assembled with a metal plate that does not react with the phase change material, the phase change material filled in the hot plate means is made of a liquid metal.

In this case, preferably, the phase change material filled in the hot plate means is made of sodium, and the hot plate means is made of a stainless plate that does not react with the sodium.

In addition, a capillary means for smoothing the phase change of the phase change material and transferring the phase change material condensed in the heating space to the combustion space may be further provided inside the hot plate means.

Next, the present invention as another technical aspect, the continuous steel sheet is continuously passed in a multi-loop form annealing furnace body; And,

A plurality of flat plate heaters installed in the longitudinal direction of the annealing furnace body;

Including,

The inner space of the annealing furnace main body provides a continuous annealing furnace having a flat plate heating device composed of an annealing chamber in which annealing of the combustion chamber and the continuous steel sheet is performed by the wall means of the heating apparatus.

At this time, preferably, the combustion means of the heating device is preferably arranged in a pair of upper and lower sides of the heating device hot plate means arranged in the longitudinal and transverse direction between the continuous steel sheet.

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

Figure 3 is a perspective view showing the overall configuration of a flat plate heating apparatus according to the present invention, Figure 4 is a structural view of Figure 3, Figure 4a is a side view, Figure 4b is a plan view, Figure 4c is a front view, Figure 5 is an overall configuration diagram showing a continuous annealing furnace having a flat plate heating apparatus of the present invention, Figure 6 is a side configuration diagram of FIG.

3 and 4 show a flat plate heating device 1 of the present invention, the heating device 1 of the present invention, the hot plate means 10, the heat transfer fin means 20 and the combustion means 30 It is composed of, further comprising a wall means 40 and the capillary means 50, these components (10), 20, 30, 40, 50 will be described in detail as follows.

3 and 4 show the hot plate means 10 of the heating apparatus 1 according to the present invention. The hot plate means 10 of the present invention has a vacuum inside, and will be described in detail below. The phase change material 12 is filled.

That is, the hot plate means 10 is assembled with a rectangular body assembled with a metal plate that does not react with the phase change material, and as described above, the inside is in a vacuum state in which the air is released, wherein the hot plate means 10 is filled in The phase change material is a liquid metal.

On the other hand, the phase change material filled in the inside of the hot plate means 10 preferably uses sodium (Sodium), such a liquid metal of sodium is known.

In addition, the hot plate means 10 is preferably assembled with a stainless plate that does not react with sodium, the liquid metal.

Next, Figure 3 and Figure 4 shows the heat transfer fin means 20 of the heating device 1 of the present invention, the heat transfer fin means 20 of the present invention as described above is one outer side of the hot plate means 10 While being provided to the heat transfer, that is, the heat applied by the combustion means 30 is very smoothly transferred, and thus the heating plate means 10 is coupled to the heating plate means 10 is configured to be heated. .                     

At this time, the heat transfer fin means 20 is a plurality of integrally vertically assembled in one out of the vertical direction in the outward direction on one side of the heat plate means 10 is a rectangular plate heat transfer well.

On the other hand, the combustion means 30 of the present invention may use a normal burner.

And, as shown in Figure 3, the wall means 40 for separating the heating fin means 20 and the space that is not provided with the heating fin means 20 into a heating space A1 and a combustion space A2, respectively. ) May be provided to one side of the heat transfer fin means 20, the device cover body for blocking the heat plate means 10, heat transfer fin means 20, continuous means 30 and wall means 40 from the outside (60) That is, a fireproof cover body is provided.

In addition, the inside of the hot plate means 10 is a capillary means (50), that is, the mesh netting means for smoothly changing the phase according to the heat transfer state of the liquid metal, which is a phase change material such as sodium, which will be described in more detail below. It is provided on the upper and lower sides.

Thus, as shown in Figure 3, the constitutional features of the flat plate heating apparatus 1 of the present invention, the heat transfer fin means located in the combustion space (A2) affected by the flame of the burner which is the direct combustion means 30 ( 20 is transferred to the hot plate means 10 which is a heat medium, and heating (annealing) of the heating element S and the like which are located adjacent to the heating space A1 of the hot plate means 10 is performed. Therefore, in the present invention, the hot plate means 10 with less cracks is used as a heat medium instead of the conventional radiation tube.

At this time, since the inside of the hot plate means 10 is sealed in a state in which the phase change material 12 is filled in a vacuum state, as shown in Figs. 3 and 4A, the phase change in the combustion space (A2) The material, ie, the liquid metal 12 of sodium, is heated by heat applied by the heat transfer fin means 20 and vaporizes inside the heat plate means 10, so that the heating space A1 of the heat plate means 10 having a low temperature. In this phase change material 12 is condensed to release heat, and thus heat is transferred to the heating fin means 20 and the hot plate 10 of the combustion space-> hot plate 10 of the heating space (A1) Heat is released from the space, and the heating target object is heated.

As a result, the liquid metal which is the phase change material 12 filled in the heat plate means 10 has a flow flow (arrow of FIG. 4) by repeating the combustion space and the heating space, and heat is heated on the combustion space side. Delivered to the side.

At this time, the heating temperature by the hot plate means 10 is controlled by the combustion means 30, in particular in the subsequent continuous annealing furnace 100, the fuel of the burners which are the combustion means 30 arranged vertically on the body of the annealing furnace By adjusting the dosage, the temperature of the continuous annealing furnace may be controlled.

In addition, the hot plate means 10 itself receives thermal energy in the form of radiation and convection from the high temperature combustion gas generated by the combustion of the burner in the combustion space (A2), but the heat transfer fin means ( 20) Install.

On the other hand, looking at the phase change material to be filled in the inside of the hot plate means 10 in detail, such a phase change material 12 is the temperature of the heating device (1 in Figure 3) or the continuous annealing furnace (100 in Figure 5) According to the present invention, various materials may be used, and when the internal temperature of the continuous annealing furnace is about 800 ° C., it is most preferable to use a liquid metal such as sodium.

At this time, as shown in Figures 3 and 4a, the capillary means 50 provided in the inside of the hot plate means 10, for example, the mesh is the image when heating or radiating heat inside the hot plate means 10 The phase change of the liquid metal, which is the change material 12, is facilitated, and the precious gas into the combustion space of the liquid that is liquefied and condensed is smoothed.

That is, the internal phase change material 12 of the hot plate means 10 is present in the liquid state between the metal net mesh, which is the capillary means 50, and the heat transfer fin means 20 by the high temperature combustion gas on the combustion space A2 side. ) And the hot plate means 10 are heated to a high temperature, and vaporizes.

Therefore, when the vapor pressure is increased by the steam inside the hot plate means 10 of the combustion space A2, the vapor of the phase change material moves to the heating space side (arrow of FIG. 4A), and the heating space A1. Heat is transferred from the surface of the hot plate means 10 to the heating target to lower the surface temperature of the hot plate means 10 on the heating space A1, and the phase change material in the vapor state changes into a liquid state.

Again, the phase change material in the liquid state is returned to the combustion space (A2) side by the capillary action of the metal net mesh, which is the capillary means 50, where the action of being heated again and vaporized is repeated.

As a result, the liquid metal, which is the phase change material 12, emits heat in the heating space in a natural circulation form inside the hot plate means 10, wherein the hot plate means 10, the heat transfer fin means 20, and the hot plate means Due to the interaction of the internal phase change material 12, it is possible to transfer a lot of heat even at a small temperature change, and the heat is also kept very uniform.

 In addition, the heat transfer efficiency according to the phase change of the liquid metal is very higher than the efficiency of convective or radiative heat transfer because there is almost no resistance on the surface can transmit a large heat flux.

Accordingly, the flat plate heater 1 of the present invention is to perform uniform heat transfer without causing local cracks or the like in the conventional radiation tube.

Next, FIG. 5 and FIG. 6 show a continuous annealing furnace 100 having a flat heating device of the present invention. Hereinafter, the configuration and detailed description of the heating device 1 will be briefly described.

That is, as shown in Figures 5 and 6, the continuous annealing furnace 100 of the present invention, the annealing furnace main body 110 through which the continuous steel sheet (S) passes in a multi-loop form, and the annealing furnace body ( Including a plurality of the plate-type heating device (1) described so far installed in the longitudinal direction of the 110, wherein the internal space of the annealing furnace body 110 is by the wall means 40 of the heating device (1) The combustion chamber 120 and the continuous steel sheet 100 is composed of an annealing chamber 130 is annealing is made.

At this time, the continuous annealing furnace 100 of the present invention is installed so that a plurality of steel sheet feed rolls (R) in the continuous steel sheet proceeds in a loop shape, and thus, as shown in Figure 6, enters the initial continuous annealing furnace Once the steel sheet has been continuously heated, the annealing of the steel sheet will be completed at the desired temperature at the time of final extraction.

At this time, the annealing furnace body 110 is configured as a firebrick and a wall, and the wall means 40 shown in FIG. 4 is also made of a fireproof material.

On the other hand, as shown in Figure 5 and Figure 6, the combustion means 30 of the heating device 1 provided in the continuous annealing furnace 100 is the moving of the continuous steel sheet (S) which is transferred in a loop form as a burner. When the hot plate means 10 is arranged on the basis of the pair, it is preferable to be installed on the upper and lower sides.

Therefore, the combustion gas heated by the burner which is the combustion means 30 in the combustion chamber 120 at one side of the wall means 40 is heated by the heat transfer fin means 20 and the hot plate means 10 of the heating device 1. When it is transmitted, as described above, by the action of the internal phase change material of the hot plate means 10 is to transfer heat to the continuous steel sheet (S) that is continuously flown in the annealing chamber 130 is to perform the annealing of the steel sheet .

Accordingly, according to the continuous annealing furnace 100 of the present invention using the flat plate heating apparatus of the present invention, the hot plate means 10 arranged across the combustion chamber and the annealing chamber, the heat transfer fin means 20 of the combustion chamber, and the hot plate means. Due to the high heat transfer effect of the heat transfer fin means and the high thermal efficiency and temperature uniformity of the heat plate means by the internal phase change material of the continuous steel sheet, it is possible to anneal the temperature distribution more uniformly than the steel sheet annealing of the conventional radiant tube type. In this way, it is to improve the overall thermal efficiency of the continuous annealing furnace, operating productivity and annealing quality of the steel sheet.

In addition, since the combustion structure is directly formed in the combustion chamber internal space of the annealing furnace, since combustion is performed inside the conventional radiant tube, there is no resistance element, and thus the combustion structure is made stable, and the combustion control is performed separately. By controlling the fuel supply of the combustion means 30 it is possible to simply control.

 Thus, according to the flat plate heating apparatus of the present invention, since the flat heat transfer medium is used instead of the radiation tube type, it solves various problems occurring in the radiation pipe, and in particular, there is little local cracking or damage of the heat transfer medium, By preventing this prolonged and uneven heating, it provides an excellent effect of increasing the overall heating efficiency.

In addition, according to the continuous annealing furnace of the present invention, by performing continuous annealing of the continuous steel sheet by using the flat plate heating device, while controlling the overall combustion system stably, in particular the non-uniform heating pattern in the width direction of the steel sheet of the continuous steel sheet By solving the above, it is to provide another excellent effect of improving the annealing quality of the steel sheet while improving the annealing operation of the overall continuous steel sheet.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (7)

Hot plate means in which a vacuum is inside and filled with a phase change material; An electrothermal fin means for providing heat to the heat plate while being provided on an outer side of the hot plate means; And, Combustion means disposed adjacent to the heat transfer fin means; Flat plate heating device configured to heat the heating element to be disposed close to or passing through the hot plate means. The flat plate heating apparatus according to claim 1, further comprising wall means for separating the heating fin means and the space where the heating fin means are not provided into a heating space and a combustion space, respectively. According to claim 1, wherein the hot plate means is composed of a rectangular body assembled with a metal plate that does not react with the phase change material, And a phase change material filled in the hot plate means is a liquid metal. According to claim 3, The phase change material filled in the hot plate means is composed of sodium (Sodium), And said hot plate means, which is a rectangular assembly of metal plates, comprises a stainless plate which does not react with this sodium. The flat plate type of claim 1, further comprising capillary means for smoothing the phase change of the phase change material and transferring the phase change material condensed in the heating space to the combustion space. Heating device. Annealing furnace body that the continuous steel sheet continuously passes in a multiple loop form; And, A flat plate heating apparatus according to any one of claims 1 to 5, wherein a plurality of said annealing furnace bodies are installed in the longitudinal direction; Including, An inner space of the annealing furnace main body is a continuous annealing furnace having a plate-type heating device consisting of an annealing chamber in which annealing of the combustion chamber and the continuous steel sheet is made by the wall means of the heating apparatus. 7. The continuous annealing furnace according to claim 6, wherein the combustion means of the heating device is disposed on the upper and lower sides of the heating device hot plate means arranged in the longitudinal and transverse directions between the continuous steel plates.

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