JP7117902B2 - heating furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating furnace for heating a material to be heated such as a slab during hot rolling.

A heating furnace is used to heat a material to be heated such as a cast slab, billet, or bloom to a temperature suitable for hot rolling. In this heating furnace, the material to be heated is generally charged so that the longitudinal direction of the material to be heated is perpendicular to the conveying direction of a conveying path provided in the heating furnace, and the material to be heated is passed through the conveying path. It is a structure that heats and extracts out of the furnace while being conveyed along.
In addition, such a heating furnace is generally composed of a preheating zone, a heating zone and a soaking zone. It is configured so that it can be heated to

By the way, in recent years, in addition to uniformly heating a material to be heated such as a slab as a whole, it has been proposed to apply a gradient heating (or a reverse gradient heating) so as to have a temperature gradient between the leading end and the trailing end of the slab. is being done.
For example, when producing a thin rolled plate, the time from the start of finish rolling of the front end of the slab to the start of finish rolling of the rear end of the slab becomes longer, and the temperature of the rear end of the slab decreases during that time. growing. As a result, the deformation resistance increases, causing deterioration in dimensions and shape due to load fluctuations, and the rear end of the slab sometimes falls below the lower limit of the predetermined finish rolling temperature.

Therefore, in anticipation of such a temperature drop, tilt heating is performed so that the temperature of the trailing edge of the slab is higher than the temperature of the leading edge when heating the slab before hot rolling. As a result, the rear end of the slab can be rolled within the target finish rolling temperature range, the load fluctuation at the rear end of the slab can be reduced, and rolling can be performed within the predetermined finish rolling temperature range. It becomes possible.

Also, in order to improve productivity, there are cases where hot rolling is gradually increased after the tip of the slab is caught in the finishing mill. As a result, the temperature at the rear end of the slab (rolled steel sheet) after rolling becomes high. As a result, scale defects may occur or the upper limit of the finish rolling temperature may be exceeded.
In such a case, in anticipation of an increase in the finishing delivery side temperature, if reverse inclination heating is performed to lower the temperature of the slab trailing end portion than the temperature of the leading end portion, the finish rolling delivery side temperature of the slab trailing end portion can be set to a predetermined value. can be set within the temperature range of , and it becomes possible to achieve both high-quality rolled steel sheets and improved productivity.

As a conventional heating furnace, for example, a heating furnace described in Patent Document 1 is known.
In this heating furnace, a plurality of pairs of alternating combustion regenerative combustion devices (also called regenerative combustion burners or regenerative burners) are arranged on the left and right sides of the conveying path of the material to be heated (slab), and further, the conveying path is On the upper side, a continuous combustion device is arranged from the middle of the conveying path to the exit side of the heating furnace, and by adjusting the combustion amount of the continuous combustion device, the temperature of the slab in the furnace width direction can be made uniform or arbitrarily. controlling.

In a heating furnace equipped with regenerative combustion burners, such as the reheating furnace described in Patent Document 1, between a pair of regenerative combustion burners arranged facing each other on both sides of a conveying path for the material to be heated, While performing alternating combustion in which combustion and exhaust gas are alternately repeated, exhaust heat of combustion exhaust gas is stored and recovered by a heat storage medium during exhaust, and combustion air is preheated by the heat stored in the heat storage medium during combustion. there is

JP 2009-161837 A

As described above, in the heating furnace described in Patent Document 1, exhaust heat of combustion exhaust gas is recovered on both sides of the conveying path (furnace walls of the heating furnace) from the viewpoint of reducing fuel consumption and _CO2 emissions. A regenerative combustion burner capable of preheating combustion air is used to improve energy efficiency (energy saving).

On the other hand, on the upper side of the conveying path (the ceiling wall of the heating furnace), a continuous combustion device (also called a roof burner) that can adjust the amount of combustion is installed from the middle of the conveying path to the exit side. It is possible to control the temperature distribution in the width direction of the furnace, which was difficult only with the regenerative combustion burner placed on the furnace wall.

However, in the heating furnace described in Patent Document 1, although it is possible to control the temperature distribution of the material to be heated in the furnace width direction by using the roof burner arranged on the ceiling wall, it is difficult to improve the energy efficiency. There has been a demand for a technology capable of efficiently slanting the heating material from above.

Furthermore, recently, in addition to the above-described inclined heating and reverse inclined heating, techniques for imparting a desired temperature distribution (including uniform distribution) in the longitudinal direction of the material to be heated and for improving accuracy have been required. ing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating furnace capable of achieving both temperature control in the longitudinal direction (furnace width direction) of the material to be heated and energy saving. .

The gist of the present invention, which aims to solve the above problems, is as follows.
[1] A heating furnace in which a material to be heated is heated while being conveyed in a direction perpendicular to its longitudinal direction, and is located between a charging section for charging the material to be heated and an extraction section for extracting the material to be heated. a plurality of regenerative combustion burners arranged in a first heating area formed along the conveying path, arranged above the conveying path and opposed to the left and right of the conveying path, and performing alternating combustion with each other, and below the conveying path. A plurality of regenerative combustion burners arranged to face each other on the left and right sides of the conveying path and alternately burning with each other, and formed on at least one of the upper side and the lower side of the conveying path between the charging section and the extracting section. and a self- regenerative burner disposed in the furnace width direction temperature control unit, the furnace width direction temperature control unit having a plurality of combustion regions divided in the furnace width direction, and each of the combustion regions and a heating furnace, wherein the self- regenerative burner capable of adjusting the amount of combustion is arranged for each combustion zone .
[2] The heating furnace according to [1] above, wherein the self- regenerative burner is arranged above the conveying path, and the second heating region is positioned closer to the extraction part than the self- regenerative burner. 2. A heating furnace according to claim 1, wherein alternating combustion is performed between adjacent regenerative combustion burners arranged below the conveying path.
[3] The heating furnace according to [1] or [2] above, wherein a plurality of heating furnaces are arranged on both left and right sides of the transport path from the position where the self- regenerative burner is arranged to the extraction side. A heating furnace characterized by comprising a continuous combustion burner of
[4] The heating furnace according to any one of [1] to [3] above, wherein a plurality of self- regenerative burners are arranged in each of the combustion regions along the conveying direction. heating furnace.

According to the present invention, it is possible to provide a heating furnace capable of achieving both temperature control in the longitudinal direction (furnace width direction) of the material to be heated and energy saving.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view explaining an example of schematic structure of the heating furnace which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view explaining an example of schematic structure of the heating furnace which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view explaining an example of a schematic structure of the heating furnace which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual diagram explaining schematic structure of the regenerative burner used for the heating furnace which concerns on 1st Embodiment of this invention. FIG. 5 is a conceptual diagram illustrating a schematic configuration of a modification of the regenerative burner used in the heating furnace according to the first embodiment of the present invention; Fig. 2 is a perspective view illustrating an example of a schematic configuration of a heating furnace in which continuous combustion burners are arranged according to a second embodiment of the present invention; FIG. 11 is a perspective view illustrating an example of a schematic configuration of a heating furnace in which continuous combustion burners are arranged according to a third embodiment of the present invention; FIG. 8 is a side view of the heating furnace shown in FIG. 7, for explaining the schematic configuration of the heating furnace according to the third embodiment of the present invention; FIG. 11 is a perspective view illustrating an example of a schematic configuration of a heating furnace in which continuous combustion burners are arranged according to a fourth embodiment of the present invention; FIG. 10 is a side view of the heating furnace shown in FIG. 9 for explaining the schematic configuration of the heating furnace according to the fourth embodiment of the present invention;

<First embodiment>
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG.
1 to 3 are diagrams illustrating an example of the schematic configuration of the heating furnace according to the first embodiment of the present invention. FIG. 1 is a perspective view of the heating furnace, FIG. 2 is a side view of the heating furnace, FIG. 3 shows a plan view. In the figure, reference numeral 101 indicates a heating furnace.
In the drawings for explaining the configuration of the heating furnace, the size, thickness, dimensions, etc. of each part may be emphasized regardless of the actual dimensional relationship.

The heating furnace 101 according to the first embodiment, as shown in FIGS. A furnace chamber 3 formed along the conveying path 2 between the furnace and the extraction section 1B, a plurality of regenerative combustion burners (regenerative burners) 4 arranged on both left and right sides of the conveying path 2 in the conveying direction, and conveying A plurality of self-regenerative burners (regenerative burners ) 51. A flue 7 is provided on the ceiling surface 3b on the side of the charging section 1A.

In the heating furnace 101 according to the first embodiment, the conveying path 2 conveys the material to be heated in a direction orthogonal to the longitudinal direction.
Further, the furnace width direction temperature control unit 31 has a plurality of combustion regions divided in the furnace width direction, and a regenerative burner is arranged in each combustion region. In this embodiment, the furnace width direction temperature control unit 31 indicates a region in which tilt heating can be performed, but whether or not to perform tilt heating in the furnace width direction temperature control unit 31 can be arbitrarily set. can.

In the heating furnace 101, when the material to be heated is sequentially conveyed from the charging section 1A side to the extracting section 1B side by the conveying path 2, first, heat is accumulated between the charging section 1A and the self-regenerative burner 51. The material to be heated is uniformly heated to a predetermined temperature by the combustion burner 4 .
Next, in the oven width direction temperature control section 31, the material to be heated is subjected to inclined heating or reverse inclined heating by the self-regenerative burner 51 to form a temperature gradient along the longitudinal direction of the material to be heated.

The material to be heated by the heating furnace 101 of the present embodiment is, for example, a steel material such as a cast slab, billet, or bloom.
The material to be heated is subjected to tilt heating, reverse tilt heating, or uniform heating by the heating furnace 101 , and then hot rolled by a hot rolling mill (not shown) arranged after the heating furnace 101 .

The material to be heated is sequentially conveyed by the conveying path 2 provided in the heating furnace 101 .
As the transport path 2, for example, a walking beam device capable of sequentially transporting the material to be heated can be used.
Further, the material to be heated is conveyed on the conveying path 2 with its longitudinal direction oriented in a direction substantially orthogonal to the conveying direction. That is, the material to be heated is conveyed with its longitudinal direction arranged along the width direction of the furnace.

Next, on both left and right sides of the conveying path 2, a plurality of regenerative combustion burners 4 are arranged from the charging section 1A to the extracting section 1B.
As the regenerative combustion burner 4, for example, an FDI (Fuel Direct Injection) (registered trademark (hereinafter the same)) type regenerative burner can be used. In the heating furnace 101 shown in FIGS. 1 to 3, the regenerative combustion burner 4 is arranged on the side wall surface 3a of the furnace inner chamber 3, and the flame (flame) F is blown out along the width direction of the furnace. ing.
The angle of the regenerative combustion burner 4 is adjusted so that the flame F does not directly hit the material to be heated.

Further, the regenerative combustion burners 4 are arranged on the left and right sides of the conveying path 2 along the conveying direction above and below the conveying path 2 .
Specifically, the regenerative combustion burners 4 according to the present embodiment are arranged facing left and right above the conveying path 2 in the first heating region T1 from the charging section 1A to the extraction section 1B. A plurality of combusting upper regenerative combustion burners (regenerative combustion burners) 4A and a plurality of lower regenerative combustion burners (regenerative combustion burners) arranged opposite to each other on the left and right below the conveying path 2 for alternating combustion. 4B and . With this configuration, when the material to be heated is conveyed on the conveying path 2, the material to be heated can be heated from the left and right on the upper and lower sides thereof.

When the furnace width direction temperature control unit 31 performs tilt heating or reverse tilt heating, heat is accumulated in the furnace width direction temperature control unit 31 (upper side of the transfer path 2 near the extraction unit 1B) where the self-regenerative burner 51 is arranged. When the regenerative combustion burner 4 is arranged and heated at the same time, the regenerative combustion burner 4 tries to uniformly heat the material to be heated, and the inclined heating or reverse inclined heating is diluted. It is preferable not to arrange the regenerative combustion burner 4 in the temperature control section 31 . However, in the case of uniformly heating the material to be heated, the regenerative combustion burner 4 may be arranged on the upper side wall 3a' of the conveying path 2 closer to the extraction section 1B where the self-regenerative burner 51 is arranged.
On the other hand, a lower regenerative combustion burner 4B is arranged on the lower side of the conveying path 2 near the extraction section 1B to heat the lower surface side of the material to be heated.

In addition, in the regenerative combustion burners 4, for example, the upper regenerative combustion burners 4A, 4A (or the lower regenerative combustion burners 4B, 4B) arranged on both sides of the conveying path 2 are alternately arranged. configured to burn.
When one of the left and right regenerative combustion burners burns, the other regenerative combustion burner sucks the combustion gas, thereby heating the heat storage material contained in the other regenerative combustion burner. Next, when the other of the left and right regenerative combustion burners is burned, air for combustion is brought into contact with the heated regenerative material to preheat the air. By performing alternating combustion in this way, thermal energy can be used efficiently.

Regenerative combustion burners include, for example, an FDI type regenerative burner and a gun type regenerative burner, but the FDI type regenerative burner is more effective than the gun type regenerative burner in making the temperature distribution in the furnace chamber uniform. Therefore, it is preferable to use an FDI type regenerative burner for heating the material to be heated by the regenerative combustion burner 4 .

Further, in the present embodiment, the alternating combustion is performed by the regenerative combustion burners 4, 4 arranged on both left and right sides of the conveying path 2, but for example, the regenerative combustion burners 4, 4 arranged adjacent to each other Alternating combustion between

Specifically, in the second heating region T2 on the extraction part 1B side of the arrangement position of the self-regenerative burner 51 closest to the extraction part, the lower regenerative combustion burners 4B, 4B adjacent to each other in the conveying direction are alternately arranged. Combustion is preferred. That is, as shown in FIG. 1, among the lower regenerative combustion burners 4B, the lower regenerative combustion burner 4B arranged in the second heating region T2 closer to the extraction part 1B than the arrangement position of the self-regenerative burner 51 , adjacent burners (for example, lower regenerative combustion burners 4Ba and 4Ba shown in FIG. 3, lower regenerative combustion burners 4Bb and 4Bb, lower regenerative combustion burners 4Bc and 4Bc, lower regenerative combustion burners 4Bd and 4Bd) are preferably alternately burned.
In this way, in the second heating region T2 on the extraction part 1B side of the position where the self-regenerative burner 51 is arranged, the lower regenerative combustion burners 4B, 4B arranged next to each other are alternately burned, so that the furnace width It is possible to control the amount of combustion in the direction, and when performing inclined heating or reverse inclined heating, the temperature difference in the longitudinal direction of the material to be heated (temperature difference in the furnace in the width direction) can be more efficiently can be granted.

Next, the self-regenerative burner 51 will be described.
As shown in FIGS. 1 to 3, the self-regenerative burner 51 according to the present embodiment is a furnace width direction temperature control device formed above the conveying path 2 in an arbitrary region between the charging section 1A and the extraction section 1B. It is arranged in the section 31 . Further, the furnace width direction temperature control section 31 has a plurality of combustion regions 31A to 31D divided in the furnace width direction.

Two self-regenerative burners 51 are arranged at predetermined intervals in each of the combustion regions 31A to 31D. Specifically, the self-regenerative burners 51 are arranged along the furnace width direction above the conveying path 2 on the extraction part 1B side of the installation position of the upper regenerative combustion burner 4A. They are arranged side by side at intervals.

Note that the furnace width direction temperature control unit 31 is not limited to the upper side of the conveying path 2, and can be installed in at least one of the upper side and the lower side of the conveying path 2 in an arbitrary region between the charging section 1A and the extraction section 1B. It is sufficient if it is arranged. Further, the self-regenerative burner 51 is preferably arranged in each of a plurality of combustion regions obtained by dividing the furnace width direction temperature control section 31 in the furnace width direction.
Further, it is possible to arbitrarily set whether a plurality of self-regenerative burners 51 or one self-regenerative burner 51 is arranged in each combustion area.

In the first embodiment, it is preferable to adopt the self-regenerative burner 51 as the gene burner arranged above the conveying path 2 on the extraction section 1B side of the installation position of the upper regenerative combustion burner 4A. This "self-regenerative burner" will be described below.

A self-regenerative burner is a type of regenerative combustion burner, and a normal regenerative burner (regenerative combustion burner) alternately burns between a pair of burners (two units) arranged opposite to each other as described above. In other words, while each burner emits flames intermittently, the self-regenerative burner has a structure in which two burners are placed next to each other, and these adjacent burners alternately burn. is. The structure of the self-regenerative burner will be described with reference to FIG.

As shown in FIG. 4, the self-regenerative burner includes a burner portion D integrated with a pair of adjacent heat storage bodies (heat storage body A and heat storage body B). A combustion-supporting gas (e.g., air) for is supplied to a pair of heat storage bodies A and B (heat storage body A, heat storage body B) via a pair of air exhaust gas nozzles A and B (air exhaust gas nozzle A, air exhaust gas nozzle B). are alternately passed through and preheated. The exhaust gas also heats the heat storage body A or the heat storage body B by sequentially passing through the heat storage body B or the heat storage body A through which the combustion-supporting gas for combustion does not pass.

That is, the pair of heat storage bodies A and B (heat storage body A and heat storage body B) alternately repeats the role of being heated by the exhaust gas and the role of preheating the combustion-supporting gas. Also, the self-regenerative burner has a pair of adjacent heat storage bodies (heat storage body A and heat storage body B), and both heat storage bodies share one burner tile and fuel nozzle C. Therefore, unlike normal regenerative burners, frames are emitted continuously from one burner tile.
Therefore, the self-regenerative burner has an energy saving property equivalent to that of a normal regenerative burner, and has the advantage of being more space-saving than a normal regenerative burner.

In FIG. 4, two heat storage bodies (heat storage body A and heat storage body B) are separately formed and arranged adjacent to each other in parallel, but two heat storage bodies (heat storage body A and heat storage body It may be a structure in which B) is linked together. Also, although FIG. 4 shows an example in which the shape of the burner tile is circular, it is not limited to this, and may be rectangular or the refractory itself of the furnace wall.

The self-regenerative burner 51 is positioned above the transport path 2 . More specifically, for example, as shown in FIG. 2, the inclination formed in the furnace width direction temperature control section 31 is such that the burner port (burner tile) of the self-regenerative burner 51 faces obliquely downward toward the extraction section 1B side. It is arranged on the wall surface 31S.

Specifically, the inclined wall surface 31S of the furnace inner chamber 3 has a concave portion formed in the middle of the conveying direction toward the conveying path side. A burner mouth (burner tile) is arranged.

As shown in FIGS. 1 to 3, the self-regenerative burners 51 are arranged in four combustion regions 31A to 31D equally divided in the furnace width direction along the conveying direction in the furnace width direction temperature control section 31. ing.
In this embodiment, an example in which the furnace width direction temperature control unit 31 has four combustion regions evenly divided in the furnace width direction is shown. Any number can be set. The number of combustion regions is preferably three or more, more preferably four or more.

Further, in the present embodiment, the case where the width direction dimension of the combustion region in the furnace width direction temperature control unit 31 is uniform has been described, but it is not limited to making the furnace width direction dimension of the combustion region uniform. The furnace width direction dimension of each combustion zone can be appropriately set according to the form of the inclined heating.

The position of the self-regenerative burner 51 (distance from the charging portion 1A) is not particularly limited, and is determined as appropriate from the longitudinal temperature difference (inclined heating amount) of the material to be heated and the soaking performance. good.

In this embodiment, as shown in FIGS. 1 to 3, two self-regenerative burners 51 are arranged in one combustion zone along the furnace width direction. may be appropriately determined from the longitudinal temperature difference (inclined heating amount) of the material to be heated. Preferably, the number of self-regenerative burners 51 in one combustion zone is two or more.

The self-regenerative burner 51 can adjust the amount of combustion for each of the combustion regions 31A-31D. For example, the regenerative burner in the combustion area 31A on one end in the furnace width direction is burned with a certain rated combustion amount, and the regenerative burner in the adjacent combustion area 31B is burned with a combustion amount smaller than that in the combustion area 31A. Similarly, in the combustion areas 31C and 31D, the amount of combustion can be gradually reduced or extinguished.

As a result, the temperature in the furnace below the self-regenerative burner 51 can be tilted along the width direction of the furnace. As a result, for example, the temperature difference between the maximum temperature and the minimum temperature in the longitudinal direction of the material to be heated on the conveying path 2 can be set to 30° C. or more.

The amount of combustion in each of the combustion regions 31A-31D of the self-regenerative burner must be adjusted according to the target temperature distribution in the longitudinal direction of the material to be heated.
For example, the target temperature distribution in the longitudinal direction of the material to be heated is such that the heating target temperature of the leading end of the material to be heated is t ₁ ° C. and the heating target temperature of the trailing end is t ₂ ° C. (for example, t ₁ >t ₂ ). , assume that the temperature between the leading end and the trailing end has a temperature distribution that changes at a predetermined rate along the longitudinal direction of the material to be heated. In this case, the amount of combustion in each of the combustion regions 31A to 31D of the self-regenerative burner is determined when the temperature difference in the furnace width direction of the furnace chamber 3 is optimal so that the temperature distribution of the material to be heated after heating matches the target temperature distribution. It is preferable to adjust so that

Note that the control of the combustion amount of the self-regenerative burner is not limited to the case where the combustion amount is sequentially decreased from the combustion area 31A toward the combustion area 31D as described above, and the combustion amount is sequentially decreased from the combustion area 31A toward the combustion area 31D. may be increased. Further, uniform heating may be performed by setting the combustion amount of all the combustion regions 31A to 31D to be the same.

Hereinafter, a regenerative burner according to a modification of the first embodiment will be described with reference to FIG. FIG. 5 is a conceptual diagram illustrating a schematic configuration of a modification of the regenerative burner used in the heating furnace 101 according to the first embodiment.
In the first embodiment, the self-regenerative burner 51 suitable as the regenerative burner 5 has been described with reference to FIG. A normal regenerative burner 51A may be used.

<Second embodiment>
A second embodiment of the present invention will be described below with reference to FIG.
FIG. 6 is a perspective view illustrating an example of the schematic configuration of the heating furnace according to the second embodiment of the present invention. In FIG. 6, reference numeral 102 indicates a heating furnace.

As shown in FIG. 6, the heating furnace 102 according to the second embodiment includes, for example, a plurality of continuous burners on both left and right sides of the conveying path 2 from the self-regenerative burner 51 arranged closest to the extraction section 1B to the extraction side 1B. Combustion burners 6 are arranged.

The continuous combustion burner 6 is a combustion device that continuously blows out and burns flames. As the continuous combustion burner 6, for example, a short flame burner can be used.

Further, the continuous combustion burner 6 forms a combustion frame shorter than the combustion frame formed by the regenerative combustion burner 4 in the width direction of the furnace. In addition, the continuous combustion burner 6 burns only the side of the material to be heated whose temperature is desired to be raised, or burns the side of the material to be heated whose temperature is desired to be raised by increasing the amount of combustion to increase the temperature of the material to be heated. It is possible to locally heat the side where you want to raise the
This continuous combustion burner 6 is for compensating for the insufficient amount of heating that occurs in the direction of compression of the material to be heated, and may be arranged (or operated) as necessary, or may be omitted. be.
Since other points are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

<Third Embodiment>
A third embodiment of the present invention will be described below with reference to FIGS. 7 and 8. FIG.
7 and 8 are diagrams for explaining an example of the schematic configuration of the heating furnace according to the third embodiment of the present invention. FIG. 7 is a perspective view of the heating furnace, and FIG. 8 is a side view of the heating furnace. ing. 7 and 8, reference numeral 103 denotes a heating furnace.

In the heating furnace 103 according to the third embodiment, two furnace width direction temperature control portions 31 and 32 are formed between the charging portion 1A and the extraction portion 1B. An example in which a self-regenerative burner (regenerative burner) 52 is also arranged in the furnace width direction temperature control section 32 arranged in the first heating region T1 located on the charging section 1A side of the burner 51 is shown.

The furnace width direction temperature control section 32 on the charging section 1A side has four combustion regions 32A to 32D divided in the furnace width direction.
The self-regenerative burner 52 is arranged on the inclined wall surface 32S toward the extraction section 1B side in each of the combustion regions 32A to 32D of the furnace width direction temperature control section 32 arranged on the charging section 1A side, and is arranged toward the extraction section 1B side. It is designed to be heated.

In the heating furnace 103 according to the third embodiment, the self-regenerative burner 52 is arranged in the first heating region T1 in addition to the second heating region T2. , a more efficient and large amount of tilt can be imparted.

Note that FIG. 7 shows an example in which the self-regenerative burners 52 are arranged in four evenly divided combustion regions 32A to 32D along the width direction of the furnace, as in FIG. is not limited to four and may be determined as appropriate. Also, the number of divisions need not be the same as that of the self-regenerative burner 51 in the second heating region T2, and may be appropriately determined according to the amount of inclination to be imparted.

Moreover, as shown in FIGS. 7 and 8, even when the self-regenerative burner 52 is arranged in the first heating region T1 extending from the charging section 1A to the extracting section 1B, the position where the self-regenerative burner 52 is arranged also leads to the self-regenerative heat. A plurality of continuous combustion burners 6 as shown in FIG.
Since other points are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

<Fourth Embodiment>
A fourth embodiment of the present invention will be described below with reference to FIGS. 9 and 10. FIG.
9 and 10 are diagrams for explaining an example of the schematic configuration of a heating furnace according to a fourth embodiment of the present invention. FIG. 9 is a perspective view of the heating furnace, and FIG. 10 is a side view of the heating furnace. ing. 9 and 10, reference numeral 104 denotes a heating furnace.
As shown in FIGS. 9 and 10, the heating furnace 104 according to the fourth embodiment is, for example, between the charging section 1A and the extraction section 1B. 33 and a furnace width direction temperature control section 34 formed below the transport path 2 are formed. Each furnace width direction temperature control unit 33, 34 has combustion regions 33A to 33D, 34A to 34D divided into four in the furnace width direction.

Further, the heating furnace 104 according to the fourth embodiment is a self-regenerative burner that is arranged on the inclined wall surface 33S formed facing the extraction part 1B side in the upper furnace width direction temperature control part 33 and injects obliquely downward. (regenerative burner) 53, and a self-regenerative burner (regenerative burner) 54 arranged on an inclined wall surface 33T formed facing the charging section 1A side in the furnace width direction temperature control section 33 on the upper side and emitting obliquely downward. and a self-regenerative burner (regenerative burner) 55 arranged on an inclined wall surface 34S formed facing the extraction part 1B side in the furnace width direction temperature control part 34 on the lower side and injecting obliquely upward.

In this way, a plurality of self-regenerative burners may be arranged along the transport direction in one heating region, and the transport path 2 A self-regenerative burner (regenerative burner) 54 may be arranged above the .

In the heating furnace 104 according to the fourth embodiment, a self-regenerative burner (regenerative burner) 55 is arranged below the self-regenerative burner (regenerative burner) 53, so that the material to be heated is also heated from the lower side of the conveying path 2. This makes it possible to provide a more efficient and large amount of tilt when performing tilt heating or reverse tilt heating.

According to the heating furnace 104 according to the fourth embodiment, by arranging the self-regeneration burner (regeneration burner) 54 also on the downstream side of the self-regeneration burner (regeneration burner) 53, the material to be heated can be subjected to inclined heating or reverse inclined heating. , a more efficient and large amount of tilt can be imparted.

In addition, in the heating furnace 104 according to the fourth embodiment, a regenerative burner (not shown) may be arranged below the self-regenerative burner 54 so as to correspond to the self-regenerative burner 54 and inject toward the charging portion 1A side.

Any self-regenerative burner (not shown) corresponding to the self-regenerative burner 53, the self-regenerative burner 54, the self-regenerative burner 55, and the self-regenerative burner 54 positioned below the conveying path 2 is selected. can be placed

As described above, according to the heating furnace 104, as means for imparting an inclination to the temperature distribution in the longitudinal direction of the material to be heated, the re-self regeneration burners 53, 54, and 55 arranged on the inclined wall surface in the furnace are used. Since it is possible to stably perform inclined heating or reverse inclined heating, and the exhaust heat recovery rate can be significantly improved, it is possible to achieve both temperature control in the longitudinal direction of the heated material and excellent energy saving. be able to.

In addition, according to the heating furnace 104, since a regenerative burner with excellent exhaust heat recovery is used, compared with conventional means for giving a gradient to the temperature distribution of the heated material (for example, a roof burner, etc.), the fuel load (kcal/hour) can be reduced by 3% at the maximum, making it possible to significantly reduce the manufacturing cost.

In addition, since the self-regenerative burners 53, 54, and 55 are arranged for each combustion area divided into a plurality along the furnace width direction, by adjusting the operation status of each combustion area, the target heated The degree of slope of the temperature distribution of the material can be easily controlled. That is, for example, when it is desired to give a steep slope to the temperature distribution in the longitudinal direction of the material to be heated, while increasing the combustion load of the burner corresponding to the side where the temperature is desired to be increased, the side corresponding to the side where the temperature rise is desired to be suppressed By lowering or stopping the combustion load of the burner, a temperature distribution having a steep slope can be imparted to the material to be heated.

In addition, in the area closer to the extraction part than the self-regenerative burner is arranged, alternating combustion is performed between the adjacent lower regenerative combustion burners, thereby more effectively imparting a gradient to the temperature distribution of the material to be heated. becomes possible.
Furthermore, by arranging a plurality of continuous combustion burners on both the left and right sides of the conveying path from the installation position of the self-regenerative burner to the extraction side, it is possible to impart a temperature gradient to the material to be heated. , a temperature ramp of 30° C. can be applied.

INDUSTRIAL APPLICABILITY According to the heating furnace of the present invention, it is possible to achieve both temperature control in the longitudinal direction (furnace width direction) of the material to be heated and energy saving, so that it is industrially applicable.

101, 102, 103, 104 ... heating furnace 1A ... charging section 1B ... extracting section 2 ... transport path 3 ... furnace inner chambers 3a, 3a' ... furnace wall surface, side wall surface 3b Ceiling surfaces 31, 32, 33, 34 Furnace width direction temperature control units 31S, 32S, 33S, 34S Inclined wall surfaces (inclined wall surfaces facing the extraction unit)
33T: Inclined wall surface (inclined wall surface facing the charging section)
31, 32, 33, 34 Furnace width direction temperature control unit 4 Regenerative combustion burner (regenerative burner)
4A: Upper regenerative combustion burner (regenerative combustion burner)
4B: Lower regenerative combustion burner (regenerative combustion burner)
51, 52, 53, 54, 55 Self-regenerative burner (regenerative burner)
51A... regenerative burner 6... continuous combustion burner 7... flue T1... first heating zone T2... second heating zone

Claims (4)

A heating furnace that heats a material to be heated while conveying it in a direction perpendicular to its longitudinal direction,
arranged in a first heating region formed along a conveying path between a charging portion for charging the material to be heated and an extracting portion for extracting the material to be heated;
a plurality of regenerative combustion burners arranged above the conveying path to face each other on the left and right sides of the conveying path and performing alternating combustion;
a plurality of regenerative combustion burners arranged below the conveying path to face each other on the left and right sides of the conveying path and performing alternating combustion;
a self- regenerative burner disposed in a furnace width direction temperature control section formed on at least one of the upper side and the lower side of the conveying path between the charging section and the extracting section;
with
The furnace width direction temperature control unit
A heating furnace comprising a plurality of combustion zones divided in the furnace width direction, wherein the self- regenerative burner capable of adjusting the combustion amount for each combustion zone is arranged in each of the combustion zones . The heating furnace according to claim 1,
The self- regenerative burner is arranged above the conveying path,
A heating furnace characterized in that, in a second heating region positioned closer to the extraction part than the self- regenerative burner, alternating combustion is performed between regenerative combustion burners arranged below the conveying path and adjacent to each other. . The heating furnace according to claim 1 or 2,
A heating furnace comprising a plurality of continuous combustion burners arranged on both left and right sides of the conveying path from the position where the self- regenerative burner is arranged to the extracting side. The heating furnace according to any one of claims 1 to 3,
A heating furnace, wherein a plurality of self- regenerative burners are arranged along the conveying direction in each of the combustion areas.

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