JPH08143949A - Continuous heating apparatus - Google Patents

Abstract

PURPOSE: To heat plural steel slabs to uniform temp. in good thermal efficiency by constituting the inner part of a continuous heating furnace for steel slab with plural combustion zones having a high temp. air injecting hole and a fuel gas injecting hole and making the temp. at each zone controllable. CONSTITUTION: Plural steel slab S-Sn are continuously introduced into the heating furnace 9, and while shifting the slabs on skid pipes 3 from the right side to the left side, the slabs are continuously heated in plural combustion zones Z1 -Zn constituted with the high temp. air injecting holes 1, 2 arranged at both side walls and the fuel gas injecting holes 14, 15 arranged at a furnace roof 13 or the support pipe 4 of the skid. The combustion waste gas is supplied into a regenerator 16 to recover the heat content and this heat is realized to the heating of the fuel gas and the air for combustion. The temp. at each combustion zone is detected with a temp. detector 10 and inputted into a temp. control device 20, and plural steel slabs continuously shifted in the heating furnace 9 are uniformly heated to a desired temp. by adjusting the temp. in each combustion zone, and the combustion waste gas is introduced into the regenerator 16, and after recovering the heat content, the gas is discharged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for heating a metal material such as steel slab one after another to a predetermined temperature.
The present invention relates to a high-efficiency continuous heating device capable of controlling the temperature of each object to be heated.

[0002]

2. Description of the Related Art As a heating furnace for performing hot rolling or heat treatment on metal materials such as steel slabs such as slabs and billets, there is used a continuous heating furnace for heating a material to be heated to a predetermined temperature one after another. ing. As the temperature control of the material to be heated, one that controls the temperature of the entire furnace, one that divides the inside of the furnace into a heating zone and a soaking zone, and that controls in each zone is adopted. For heating, generally, a direct heating gas burner as shown in FIG. 5 or a spiral burner as shown in FIG. 6 installed on the inner wall surface of the furnace is used (“combustion equipment engineering”). Shoichi Tsuji)).

In recent years, there has been an increasing demand for stricter quality of steel materials, and it is required that the baking temperature of steel slabs be made uniform at the target temperature. On the other hand, due to the increase in the size of the heating furnace facility, variations in the furnace temperature within the heating furnace are likely to occur, and as a result, a temperature distribution in the furnace as shown in FIG. 8 occurs,
There were cases where the steel material temperature became uneven. As a technique for improving this problem, for example, in Japanese Patent Publication No. 53-3106, a temperature detector using a plurality of burners and thermocouples is installed in the furnace width direction, and a fuel flow control valve is automatically operated based on the temperature information. A method has been proposed in which burner combustion control is performed by doing so to uniformly heat the temperature in the width direction of the heating furnace.

Japanese Unexamined Patent Publication (Kokai) No. 5-118764 adopts a heat storage type exchange combustion burner system for supplying combustion air to a burner through a heat storage body and discharging combustion gas from the burner, thereby making a zone of a heating furnace. We have proposed a steel heating furnace that makes the internal temperature distribution uniform. In addition, JP-A-5-
Japanese Patent No. 180409 discloses that in a high-temperature heating furnace such as a glass melting furnace, a fuel gas injection portion is provided in an air duct opened to the inner surface of the side wall and in several places on the inner surface of the side wall next to the duct opening to adjust the supply amount of fuel gas. A method of performing combustion control by doing so has been proposed.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The method proposed in Japanese Laid-Open Patent Publication No. 06 is a technique to be noted in that it pays attention to the furnace temperature variation in the furnace width direction and controls the combustion of each burner according to the detected value, but it is a conventional heating gas burner. Since the position of the high temperature frame depends on the burner port position, it is difficult to practically achieve uniform heating of the steel material evenly by controlling the combustion amount and adjusting the frame length and temperature. Met. Further, since the furnace temperature atmosphere is distributed in the furnace length direction, it is difficult to control the temperature when mixed in the materials to be heated under different heating conditions.

Further, the method of applying the heat storage type exchange combustion burner system proposed in the above-mentioned Japanese Patent Laid-Open No. 5-1187764 is also a heating furnace using a gas burner, and the temperature distribution in the furnace depends on the burner position. It was difficult to remove the non-uniformity of the temperature in the furnace.

The method proposed in the above-mentioned Japanese Patent Laid-Open No. 5-180409 is a remarkable technique in that a fuel gas jetting portion is provided on the inner surface of the side wall of the heating furnace to control combustion in the vicinity of the duct opening. The fuel gas injection on the side wall is a secondary low carbon combustion using the exhaust gas of the combustion performed in the duct, and it was difficult to make the temperature in the furnace uniform by this method. The present invention provides a continuous heating furnace that heats a metal material such as a steel slab such as a slab or a billet to a predetermined temperature in order to uniformly heat various materials to be heated not only in the furnace width direction but also in the furnace length direction. To aim.

[0008]

[Means for Solving the Problems] A first means of the present invention for achieving the above object is to provide a continuous heating furnace in which a material to be heated is passed to heat it to a predetermined temperature. In the line direction, high-temperature combustion air discharge ports are provided opposite to both side walls of the heating furnace, and a plurality of fuel gas discharge ports are provided on either or both of the ceiling and skid support pipes. Combustion control for each combustion zone formed by partitioning the inside of the furnace in the passage line direction of the material to be heated by each set of one or more pairs of high-temperature combustion air discharge ports and the plurality of fuel gas discharge ports A combustion control device for performing the above is provided. Preferably, as the second means,
In the first means, a partition wall is provided between the combustion zones and above or below the heated material passage line.

Further, as a third means, in a continuous heating furnace for heating a material to be heated to a predetermined temperature, a plurality of partition walls are provided above and below the material passing line between the side walls of the heating furnace. Forming combustion zones, each combustion zone comprising:
One or more pairs of high temperature combustion air discharge ports provided opposite to both side walls and a plurality of fuel gas discharge ports provided on the partition wall, and a combustion control device for performing combustion control for each combustion zone Is.

Further, as a fourth means, in a continuous heating furnace for heating a material to be heated to a predetermined temperature, a plurality of high temperature combustion air discharge ports are provided on a nose wall of the heating furnace,
A plurality of fuel gas discharge ports are provided on either or both of the ceiling and the skid support pipe.

[0011]

The device of the present invention will be described below with reference to the drawings. FIG.
FIG. 3 is a perspective view showing an example of the first invention, in which a material S to be heated such as a slab or the like is walked along a passage line L on the skid pipe 3 in the continuous heating furnace 9 from the right to the left in the drawing (FIG. (Not shown) and so on.

The first means of the present invention, in such a furnace, has a plurality of pairs (10 in the drawing) facing each other on both upper and lower side walls of the heated material passage line L as shown in FIG.
(The pair is visible) 1)
2, 2 '(2' is not shown) are provided in the direction of the line L. Further, a plurality of fuel gas discharge ports 14 are provided on the ceiling of the upper part of the furnace in a direction orthogonal to the passage line, that is, the furnace width direction and the line direction. A fuel gas discharge port 15 is provided in the direction.

Next, the combustion method in FIG. 1 will be described. Air outlets 1, 1 ', 2, 2'provided in pairs
(2 'is not shown) From either side or both simultaneously or from one side, combustion air heated to a temperature 100 ° C or more higher than the ignition temperature of the fuel gas is blown to generate a high temperature flow field in the furnace 9, and this high temperature is generated. Fuel gas is blown into the flow field from a plurality of fuel gas outlets 14 provided on the ceiling 13 and a plurality of fuel gas outlets 15 provided on the support pipe 4. The high-temperature combustion air is produced by exchanging sensible heat of exhaust gas with the heat storage device 16 or the like, or by a hot stove outside the furnace.

Combustion starts at the moment when the fuel gas and the hot air in the hot flow field contact each other, and proceeds while diffusing in the hot flow field. When the high temperature combustion air is blown from one of the paired discharge ports, the combustion exhaust gas is sucked by the other pair of discharge ports, heat-exchanged by the heat accumulator, and then discharged. In this case, it is desirable to switch discharge and suction appropriately according to the heat capacity of the heat accumulator. When the high temperature combustion air is discharged from both sides, the combustion exhaust gas is discharged from left to right in the figure through the joint 11.

By supplying fuel from a large number of fuel gas discharge ports distributed in the furnace width direction by the device of the present invention, it is possible to form a combustion field that spreads evenly in the width direction, and at the burner flame position. Unlike the conventional heating furnace that produces a dependent temperature distribution, the object to be heated can be uniformly heated in the furnace width direction. In addition, by heating the amount of gas supplied from each fuel gas discharge port of the device of the present invention, it becomes possible to locally heat the object to be heated.

In FIG. 1, the combustion zone Z ₁ is a pair of facing combustion air discharge ports 1 provided on both side walls of the steel slab S.
1'and a plurality of fuel gas discharge ports 14 provided on the ceiling above the discharge ports are formed as one set, and the temperature detector 1
0, the ambient temperature of the zone is detected and input to the combustion control device 12 as shown by the broken line in FIG. The combustion zone R ₁ is for discharging one or more pairs of facing air discharge ports 2, 2 ′ (2 ′ not shown) provided on both side walls below the steel slab S and for discharging fuel gas between these discharge ports. 1. A plurality of fuel gas discharge ports 15 provided in the support pipe 4 are formed as one set, and the ambient temperature of the zone R ₁ is detected by a temperature detector (not shown), which is indicated by the broken line in FIG. Is input to the combustion control device 12.

Based on the information inputted in advance, the fuel gas regulating valve is operated as shown by the dotted line to adjust the supply amount and the combustion control is performed to heat the heated material S ₁ to the target temperature. It should be noted that the number of combustion zones to be divided and formed is determined from the perspective of the size of the furnace and the required control accuracy, etc., in consideration of combustion control efficiency, but in a small furnace, even if the entire furnace is controlled as one combustion zone. Good.

Combustion zones Z ₂ , Z ₃ ... Z _n-1 , Z _n
Similarly, for the combustion zones R ₂ , R _3, ... R _n-1 , R _n , the supply amount of each fuel gas is controlled, and the heated materials S ₂ , S ₃ ... S _n-1 , S _n-1 . Each _n can be heated to a predetermined temperature uniformly. Even if the charging temperature of each material to be heated is different, or even if the predetermined heating target temperature is different, the combustion control of the device of the present invention enables uniform heating in the respective predetermined temperatures.

As shown in FIG. 1, the upper combustion zones Z _{1 to} Z _n and the lower combustion zones R _{1 to} R _n are preferably divided and formed so that the upper and lower combustion zones substantially correspond to each other. However, depending on the conditions such as the arrangement of the high temperature combustion air discharge ports 15 at the top and bottom, and the arrangement of the support pipes, each combustion zone includes the number of different high temperature combustion air discharge ports at the top and bottom, or the number of different support pipes. The number and position of the combustion zones of the furnace may be different from each other.

The second means of the present invention is, as shown in the perspective view of FIG. 2, a plurality of high temperature combustion air discharge ports 1, 1'on both upper and lower side walls of the heated material passage line L. 2,
2 '(2' is not shown) is provided in the direction of the line L,
The upper ceiling is provided with a plurality of fuel gas discharge ports 14 in the width direction orthogonal to the heated material passage line, and a plurality of fuel gas discharge ports 15 in the width direction on both sides or one side of the support pipe 4 of the skid pipe 3. There is.

As described above, the combustion zone is defined by a set of one or more pairs of high temperature combustion air discharge ports and a plurality of combustion gas discharge ports, and partition walls 5 and 7 are provided for each of these partitions. It is a thing. The partition wall is provided between the adjacent high temperature combustion air discharge ports on the side wall and between both side walls. When the combustion zone is formed by a set including two pairs of high temperature combustion air outlets, the partition wall 5 is arranged in the line direction for every two pairs of high temperature combustion air outlets.

It should be noted that this combustion zone is preferably formed by partitioning the upper and lower portions of the furnace in substantially corresponding positions, and the partition wall is also provided corresponding to this, but the location of the high temperature combustion air discharge port, If the number of the combustion zones is different in the upper and lower parts due to the difference in the number of the upper and lower parts or the arrangement condition of the support pipes, the partition walls are also provided in the different positions in the upper and lower parts.

The combustion method in FIG. 2 will be described. The combustion air heated to 100 ° C. or more higher than the ignition temperature of the fuel gas is blown from both sides of the high-temperature combustion air discharge ports 1 and 2 simultaneously or from one side to generate a high-temperature flow field in the furnace 9, A plurality of fuel gas discharge ports 14 and a plurality of fuel gas discharge ports 15 are provided on both sides or one side of the support pipe 4 in the furnace width direction. Combustion starts at the moment when the fuel gas and the hot air in the high-temperature fluidized field generated earlier come into contact with each other, and proceeds while diffusing in the high-temperature fluidized field sandwiched between the partition walls.

The high temperature combustion air may be produced by exchanging sensible heat of exhaust gas with the heat storage unit 16 or the like, or may be generated by a hot air stove outside the furnace. By the device of the present invention, the fuel is supplied from a large number of gas discharge ports into the combustion zone formed by the partition wall and the furnace wall, whereby a combustion field that is evenly spread in the width direction can be formed, and the heating target Uniform heating in the width direction of the object becomes possible.

In FIG. 2, the combustion zone Z ₁ is located above the steel slab S and is surrounded by the ceiling, the side wall and the partition wall 5,
A pair of facing combustion air discharge ports 1 provided on the side walls and a plurality of fuel gas discharge ports 14 provided on the upper ceiling between the discharge ports are formed as a set. The temperature is detected and input to the combustion control device 12 as shown by the broken line in FIG.

The combustion zone R ₁ is located below the billet S,
Inside the floor, the side wall and the partition wall 7, a pair of facing air discharge ports 2 provided on the side wall and a plurality of support pipes 4 for discharging fuel gas between the discharge ports are provided. Formed as a set of fuel gas discharge ports 15 of
A temperature detector (not shown) detects the ambient temperature of the zone R ₁ , and as shown by the broken line in FIG.
Enter 2. Based on the information input in advance, the fuel gas adjusting valve is operated as shown by the dotted line to adjust the supply amount to perform combustion control and heat the material to be heated S ₁ to the target temperature.

Combustion zones Z ₂ , Z ₃ ... Z _n-1 , Z _n
Similarly, for the combustion zones R ₂ , R _3, ... R _n-1 , R _n , the supply amount of each fuel gas is controlled, and the heated materials S ₂ , S ₃ ... S _n-1 , S _n-1 . Each _n can be heated to a predetermined temperature uniformly. Even if the charging temperature of each material to be heated is different, or even if the predetermined heating target temperature is different, the combustion control of the device of the present invention enables uniform heating in the respective predetermined temperatures.

As shown in FIG. 2, the upper combustion zones Z _{1 to} Z _n and the lower combustion zones R _{1 to} R _n are preferably formed so that the upper and lower combustion zones substantially correspond to each other. However, depending on conditions such as the arrangement of the high temperature combustion air discharge ports 15 at the top and bottom and the arrangement of the support pipes, each combustion zone includes the number of different high temperature combustion air discharge ports at the top and bottom, or different support pipes are provided. The number of combustion zones in the furnace may be different from each other in the number and position of the combustion zones.

The partition wall is made of different materials in the central part and the surface layer part, the central part is made of heat-resistant refractory brick or heat-resistant castable, and the surface part is made of alumina-silica plastic refractory or heat-resistant ceramic fiber. can do.

Next, in the third means of the present invention, as shown in the perspective view of FIG. 3, partition walls 5 and 7 are provided above and below the heated material passage line L and between both side walls. And a section surrounded by side walls forms a combustion zone. On both side walls of this combustion zone, a plurality of high temperature combustion air outlets 1, 1 ',
2, 2 '(2' is not shown) is provided in the direction of the line L, and the partition walls 5, 7 are provided with a plurality of fuel discharge ports 6, 8 in the furnace width direction, respectively.

The number of air outlets for high temperature combustion provided on both side walls of the combustion zone may be at least one pair, but may be selected depending on the size of the combustion zone, the size of the air outlets and the like. The number of partition walls arranged, that is, the number of combustion zones to be formed is determined from the viewpoint of the combustion control efficiency from the viewpoint of the size of the furnace and the required control accuracy, but as described above, the size of the air outlet for high temperature combustion. , Number of pairs, etc. are also taken into consideration.

Although it is desirable that the partition wall is formed at a position where the upper part and the lower part of the furnace substantially correspond to each other, that is, a position where the combustion zones vertically correspond to each other, the structure of the furnace, for example, the arrangement of support pipes, etc. If it is difficult to provide the upper and lower parts at corresponding positions, the positions of the partition walls and the number of the partition walls may be different between the upper and lower parts, that is, the position of the combustion zone and the number of zones may be different between the upper and lower parts.

The combustion method in FIG. 3 will be described. From both sides of the high temperature combustion air outlets 1 and 2 simultaneously or from one side, the combustion air heated to 100 ° C. or more higher than the ignition temperature of the fuel gas is blown into the high temperature flow field generated in the furnace 9 The fuel gas is simultaneously blown toward the hot air discharge flow from the fuel gas discharge ports 6 and 8 arranged on both sides of the wall in the furnace width direction. The high temperature combustion air may be produced by exchanging sensible heat of exhaust gas with the heat storage unit 16 or the like, or may be generated by a hot air stove outside the furnace.

Since the inside of the furnace has a high thermal energy field sufficient to ignite the fuel gas, the combustion starts from the moment when the fuel gas and the high temperature air come into contact with each other, and proceeds while diffusing into the high temperature flow field. With the device of the present invention, it is possible to form a combustion field that is evenly spread in the width direction by supplying fuel from a large number of gas discharge ports distributed in the furnace width direction, and to make the heating target uniform in the furnace width direction. It becomes possible to heat.

The combustion zone Z ₁ is formed as a set of upper and lower sides by partition walls, and the temperature detector 10 detects the ambient temperature of the zone and inputs it to the combustion control device 12 as shown by the broken line in FIG. Based on the information entered in advance,
As shown by the dotted line, the fuel gas adjusting valve is operated to adjust the supply amount to control combustion and heat the material to be heated S ₁ to the target temperature. The upper combustion zones Z _{1 to} Z _n and the lower combustion zones R _{1 to} R _n are preferably formed at positions substantially corresponding to each other in the upper and lower combustion zones as shown in FIG. When it is difficult to provide the upper and lower positions corresponding to each other due to the arrangement, etc., the position of the combustion zone and the number of the zones may be different between the upper and lower positions.

Combustion zones Z ₂ , Z ₃ ... Z _n-1 , Z _n
In the same manner, the supply amount of each fuel gas can be controlled to heat the materials to be heated S ₂ , S ₃ ... S _n-1 and S _n to a predetermined temperature uniformly. Even if the charging temperature of each material to be heated is different, or even if the predetermined heating target temperature is different, the combustion control of the device of the present invention enables uniform heating in the respective predetermined temperatures.

As shown in FIG. 3, the upper combustion zones Z _{1 to} Z _n and the lower combustion zones R _{1 to} R _n are respectively billets S.
It is preferably located above and below the ₁ to S _n, but the arrangement condition of the support pipe 4, can place each combustion zone vertically different positions in different number. In the first and second invention devices, the uniformity of the combustion zone can be further increased by alternately switching the combustion air discharge and the combustion exhaust gas suction of the air ports 1 and 2.

Next, in the third device of the present invention, as shown in a perspective view of FIG.
A plurality of outlets 1 for high temperature combustion air are provided on one wall, and a plurality of fuel outlets 4 are provided on the upper ceiling in the line direction.

The combustion method in FIG. 4 will be described. 1 from the ignition temperature of the fuel gas from the high temperature combustion air outlet 1.
Combustion air heated to a high temperature of 00 ° C. or more is blown into the high-temperature flow field generated in the furnace, and the fuel gas is blown toward the high-temperature air discharge stream from the fuel gas discharge ports 4 provided in plural in the ceiling line direction. The high temperature combustion air may be generated by a hot air stove 22 outside the furnace, or may be produced by exchanging sensible heat of exhaust gas with a heat accumulator or the like.

Since the inside of the furnace has a high thermal energy field sufficient to ignite the fuel gas, the combustion starts at the moment when the fuel gas and the high temperature air come into contact with each other, and proceeds while diffusing into the high temperature flow field. The combustion exhaust gas is discharged from the left to the right in the figure through the joint portion 11 in the front direction of the furnace. By supplying fuel from a large number of gas discharge ports distributed in the line direction by the device of the present invention, an arbitrary temperature combustion field can be formed in the width direction.

In the third invention device, a method of discharging fuel gas from the skid support pipe to promote combustion can be used together. When adopting the first to third invention devices, they may be combined with a conventional continuous heating furnace comprising a pre-tropical zone, a heating zone, and a soaking zone. For example, by adopting the device of the present invention in the form of combining the heating zone and the soaking zone, it is possible to realize slab heating at a higher speed with a compact heating furnace having excellent temperature uniformity.

[0042]

(Example of the present invention) With a continuous heating device of the present invention as shown in FIG. 3, a thickness of 250 mm, a width of 1200 mm and a length of 9
A 000 mm steel slab was heated. Seven combustion zones Z ₁ ... Z ₇ are provided in the longitudinal direction of the line, and the partition walls 6 and 8 have 1
COG was blown from the fuel gas discharge ports 7 and 9 arranged every m. The high temperature combustion air is generated in an external hot air stove (not shown) when the furnace temperature is low at the beginning of the heating furnace startup,
When the furnace temperature reaches 800 ° C or higher, the line is switched to the heat storage unit 16 to store the heat while sucking the combustion exhaust gas from the air port 1, and at the same time heat the combustion air through the heat storage unit 16.
Discharge from the air port 2.

A heating piece having an average temperature of 800 ° C. during charging was heated to a target temperature of 1200 ° C. (the surface temperature of the center of the steel piece). In the combustion zone Z ₂ , a temperature detector was arranged in the width direction of the furnace, and when the furnace temperature at the center of the combustion zone reached 1250 ° C., the temperature of the atmosphere inside the furnace was measured. As a result, the temperature distribution shown in FIG. 5 was measured. The temperature deviation was about 100 degrees. Further, the temperature deviation in the longitudinal direction on the surface of the billet at the outlet of the heating furnace was suppressed to 20 degrees or less.

(Conventional Example) A material to be heated similar to the above-mentioned example of the present invention was heated in a conventional side-burner type continuous heating furnace consisting of a preheating zone, a heating zone and a soaking zone. As a result, the temperature distribution as shown in FIG. The temperature deviation in the furnace atmosphere in the width direction of the furnace in the heating zone was 300 degrees or more, and the temperature deviation in the width direction of the billet surface at the exit of the heating furnace was 40 degrees or more. Even in the conventional axial flow burner type continuous heating furnace, the temperature distribution as shown in FIG. 7 was measured, and a deviation of 200 degrees or more occurred in the furnace width direction.
A temperature deviation of about 300 degrees occurred in the furnace length direction.

[0045]

According to the present invention, in a continuous heating furnace that heats metal materials such as steel slabs such as slabs and billets to a predetermined temperature in the furnace width direction that occurs in a conventional burner type heating furnace. It greatly reduces the temperature deviation in the furnace atmosphere of
The billet can be heated to a predetermined temperature with low temperature deviation.
Therefore, many effects such as quality improvement by uniform temperature of the steel slabs, yield improvement, equipment cost reduction by equipment compaction, and heating time reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a device of the present invention.

FIG. 2 is a perspective view showing an example of the device of the present invention.

FIG. 3 is a perspective view showing an example of the device of the present invention.

FIG. 4 is a perspective view showing an example of the device of the present invention.

FIG. 5 is a cross-sectional view showing an example of a conventional high temperature gas burner.

FIG. 6 is a cross-sectional view showing an example of a conventional roof gas burner.

FIG. 7 is an isotherm diagram showing a temperature distribution in a combustion zone in the device of the present invention.

FIG. 8 is an isotherm diagram showing a temperature distribution in a combustion zone in a conventional side burner heating furnace.

FIG. 9 is an isotherm diagram showing a temperature distribution in a combustion zone in a conventional axial flow burner heating furnace.

[Explanation of symbols]

1: Upper combustion air discharge port or exhaust gas suction port 1 ': Upper combustion air discharge port or exhaust gas suction port (paired with 1) 2: Lower combustion air discharge port or exhaust gas suction port 3: Skid pipe 4: Support pipe 5: Upper partition wall 6: Fuel gas discharge port of upper partition wall 7: Lower partition wall 8: Fuel gas discharge port of lower partition wall 9: Continuous heating furnace 10: Temperature detector 11: Front part of furnace 12: Gas adjustment Valve 13: Ceiling part 14: Fuel gas discharge port of ceiling part 15: Fuel gas discharge port of support pipe 16: Heat storage device 17: Air introduction pipe 18: Gas introduction pipe 19: Exhaust gas pipe 20: Combustion control device 21: Nose wall 22: Hot Stove 23: Side Burner 24: Axial Flow Burner L: Heated Material Passing Line S: Heated Material Z: Upper Combustion Zone R: Lower Combustion Zone

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C21D 9/00 101 U 9352-4K F23L 15/00 Z 15/02 F27B 9/36 9/40

Claims (4)

[Claims] 1. In a continuous heating furnace for passing a material to be heated to a predetermined temperature, a high temperature combustion air discharge port is opposed to both side walls of the heating furnace in the direction of the material passing line of the heating furnace. A plurality of fuel gas discharge ports are provided on either or both of the ceiling and the skid support pipe, and the one or more pairs of high temperature combustion air discharge ports and the plurality of fuel gas discharge ports provided facing each other are provided. A continuous heating device comprising a combustion control device for performing combustion control for each combustion zone formed by dividing the inside of the furnace in the passage line direction of the material to be heated by each set. 2. The continuous heating device according to claim 1, wherein a partition wall is provided above or below the material-to-be-heated passage or between both combustion zones. 3. A continuous heating furnace for heating a material to be heated to a predetermined temperature, wherein a plurality of partition walls are provided above and below the material passing line between the side walls of the heating furnace to form a combustion zone, Each of the combustion zones is provided with one or more pairs of high-temperature combustion air discharge ports provided on opposite side walls and a plurality of fuel gas discharge ports provided on the partition wall, and combustion control is performed for each combustion zone. A continuous heating device characterized by being provided with a combustion control device. 4. A continuous heating furnace for heating a material to be heated to a predetermined temperature by providing a plurality of high-temperature combustion air discharge ports on a nose wall of the heating furnace, and providing either a ceiling or a skid support pipe or A continuous heating device characterized in that a plurality of fuel gas discharge ports are provided on both sides.