JP2019211185A - heating furnace - Google Patents

Abstract

To provide a heating furnace capable of combining the temperature control in the longitudinal direction of the material to be heated and energy saving.SOLUTION: A heating furnace 101 where the material to be heated is heated while being carried in a direction orthogonal to its longitudinal direction comprises: a plurality of regenerative combustion burners 4a arranged at a first heating region T1 formed along a carrier passage 2 between a charge part 1A and an extraction part 1B and mutually alternation-burnt so as to be confronted with the right and left of the carrier passage in the part upper than the carrier passage 2; a plurality of regenerative combustion burners 4B mutually alternation-burnt so as to be confronted with the right and left of the carrier passage in the part lower than the carrier passage 2; and regeneration burners 51 arranged at a furnace width direction temperature control part formed at the upper side of the carrier passage. The furnace width direction temperature control part includes a plurality of combustion regions 31A to 31D divided in a furnace width direction, and the regeneration burners 51 are arranged at each of the combustion region.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heating furnace for heating a material to be heated such as a slab when the material to be heated is hot-rolled.

A heating furnace is used to heat a material to be heated such as a slab, billet, and bloom after casting to a temperature suitable for hot rolling. This heating furnace is generally charged with a material to be heated so that the longitudinal direction of the material to be heated is orthogonal to the conveying direction of the conveying path provided in the heating furnace, and the heated material is placed in the conveying path. It is structured to be heated and extracted outside the furnace while being conveyed along.
In addition, such a heating furnace is generally composed of a pre-tropical zone, a heating zone, and a soaking zone, and a material to be heated such as a slab is moved to the pre-tropical zone, the heating zone, and the soaking zone in order to achieve a uniform temperature at a predetermined temperature. It is configured so that it can be heated.

By the way, recently, not only the material to be heated, such as a slab, is heated uniformly, but also inclined heating (or reverse inclination heating) so as to have a temperature gradient between the front end portion and the rear end portion of the slab. To be done.
For example, when manufacturing a thin rolled sheet, the time from the start of finish rolling of the slab tip to the start of finish rolling of the slab rear end becomes longer, during which the temperature drop of the slab rear end is reduced. growing. As a result, deformation resistance may increase, leading to deterioration of dimensions and shapes due to load fluctuations, and the slab rear end may be less than a predetermined lower limit of the finish rolling temperature.

  Therefore, in anticipation of such a temperature drop amount, gradient heating is performed in which the temperature at the rear end of the slab is higher than the temperature at the front end when heating is performed before hot rolling. Thereby, the slab rear end can be rolled within the range of the target finish rolling temperature, the load fluctuation at the slab rear end can be reduced, or the slab rear end can be rolled within the predetermined finish rolling temperature range. It becomes possible.

In addition, in order to improve productivity, after the slab tip is caught in the finish rolling mill, hot rolling may be performed at a gradually increased speed, and the processing calorific value increases as the rolling speed increases. The temperature at the rear end of the slab (rolled steel plate) after rolling increases. As a result, scale wrinkles 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 finish delivery temperature, if reverse gradient heating is performed to lower the temperature at the rear end of the slab to be lower than the temperature at the front end, the finish rolling exit temperature at the rear end of the slab is predetermined. This makes it possible to achieve both high quality and improved productivity of the rolled steel sheet.

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 regenerative combustion devices (also referred to as a regenerative combustion burner or a regenerative burner) are arranged on both the left and right sides of the conveying path of the material to be heated (slab). On the upper side, a continuous combustion device is arranged from the middle of the conveyance path to the exit side of the heating furnace, and the temperature of the slab in the furnace width direction is made uniform or arbitrary by adjusting the combustion amount of the continuous combustion device I have control.

  As in the heating furnace described in Patent Document 1, in a heating furnace provided with a regenerative combustion burner, between a pair of regenerative combustion burners arranged opposite to each other across the conveyance path of the material to be heated. In addition, while performing alternating combustion that alternately repeats combustion and exhaust, the exhaust heat of the combustion exhaust gas is stored and recovered by the heat storage body at the time of exhaust, and the combustion air is preheated by the heat stored in the heat storage body at the time of combustion Yes.

JP 2009-161837 A

As described above, in the heating furnace described in Patent Document 1, exhaust heat of combustion exhaust gas is recovered from the viewpoint of reducing fuel consumption and CO ₂ emission on both sides of the conveyance path (the furnace wall of the heating furnace). Then, improvement of energy efficiency (energy saving) is performed using a regenerative combustion burner capable of preheating combustion air.

  On the other hand, on the upper side of the conveyance path (the ceiling wall of the heating furnace), a continuous combustion apparatus (also referred to as a roof burner) capable of adjusting the combustion amount is arranged between the middle of the conveyance path and the exit side. This makes it possible to control the temperature distribution in the furnace width direction, which was difficult with only the regenerative combustion burner arranged on the furnace wall.

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

  More recently, in addition to the above-described gradient heating and reverse gradient heating, there has been a demand for a technique for imparting a desired temperature distribution (including a uniform distribution) in the longitudinal direction of the material to be heated and further improving accuracy. ing.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the heating furnace which can make temperature control of the longitudinal direction (furnace width direction) of a to-be-heated material and energy saving compatible. .

The gist of the present invention aimed at solving the above problems is as follows.
[1] A heating furnace that heats a material to be heated while transporting it in a direction perpendicular to the longitudinal direction, and is between a charging portion for charging the material to be heated and an extraction unit for extracting the material to be heated. A plurality of regenerative combustion burners that are disposed in a first heating region formed along the conveyance path, are opposed to the left and right of the conveyance path above the conveyance path, and alternately burn, and below the conveyance path A plurality of regenerative combustion burners that are arranged opposite to the left and right of the conveyance path and alternately burn, and formed between the charging section and the extraction section on at least one of the upper side and the lower side of the conveyance path A regenerative burner disposed in the furnace width direction temperature control unit, and the furnace width direction temperature control unit has a plurality of combustion regions divided in the furnace width direction, and each of the combustion regions has the Regenerative burner placed Furnace, characterized in that is.
[2] The heating furnace according to [1] above, wherein the regenerative burner is disposed on the upper side of the conveyance path, and is located on the extraction unit side with respect to the regenerative burner, A heating furnace, which is disposed below the conveying path and alternately burns between regenerative combustion burners adjacent to each other.
[3] The heating furnace according to [1] or [2], wherein the plurality of heaters are arranged on both left and right sides of the conveyance path of the conveyance path from the regenerative burner arrangement position to the extraction side. A heating furnace comprising a continuous combustion burner.
[4] The heating furnace according to any one of [1] to [3], wherein a plurality of regenerative burners are arranged along the transport direction in each of the combustion regions. heating furnace.

  ADVANTAGE OF THE INVENTION According to this invention, the heating furnace which can make the temperature control of the longitudinal direction (furnace width direction) of a to-be-heated material and energy saving compatible can be provided.

It is a perspective view explaining an example of schematic structure of the heating furnace concerning a 1st embodiment of the present invention. It is a side view explaining an example of the schematic structure of the heating furnace concerning a 1st embodiment of the present invention. It is a top view explaining an example of the schematic structure of the heating furnace concerning a 1st embodiment of the present invention. It is a conceptual diagram explaining the schematic structure of the regeneration burner used for the heating furnace which concerns on 1st Embodiment of this invention. It is a conceptual diagram explaining schematic structure of the modification of the regeneration burner used for the heating furnace which concerns on 1st Embodiment of this invention. It is a perspective view explaining an example of the schematic structure of the heating furnace which has arranged the continuous combustion burner concerning a 2nd embodiment of the present invention. It is a perspective view explaining an example of the schematic structure of the heating furnace which has arranged the continuous combustion burner concerning a 3rd embodiment of the present invention. It is a figure explaining schematic structure of the heating furnace which concerns on 3rd Embodiment of this invention, and is a side view of the heating furnace shown in FIG. It is a perspective view explaining an example of the schematic structure of the heating furnace which has arranged the continuous combustion burner concerning a 4th embodiment of the present invention. It is a figure explaining schematic structure of the heating furnace which concerns on 4th Embodiment of this invention, and is a side view of the heating furnace shown in FIG.

<First Embodiment>
The first embodiment of the present invention will be described below with reference to FIGS.
1-3 is a figure explaining an example of schematic structure of the heating furnace which concerns on 1st Embodiment of this invention, FIG. 1 is a perspective view of a heating furnace, FIG. 2 is a side view of a heating furnace, FIG. 3 shows a plan view. In the figure, reference numeral 101 denotes a heating furnace.
Note that in the drawings illustrating the structure of the heating furnace, the size, thickness, dimensions, and the like of each part may be emphasized regardless of the actual dimensional relationship.

  As shown in FIGS. 1 to 3, the heating furnace 101 according to the first embodiment includes a conveyance path 2 that sequentially conveys a material to be heated from the charging unit 1 </ b> A side toward the extraction unit 1 </ b> B side, and a charging unit 1 </ b> A. Furnace chamber 3 formed along the conveyance path 2 from the first to the extraction section 1B, a plurality of regenerative combustion burners (regenerative burners) 4 disposed on the left and right sides of the conveyance direction of the conveyance path 2, and conveyance A plurality of self-regenerative burners (regeneration burners) having a pair of heat storage elements adjacent to each other in the furnace width direction in the furnace width direction temperature control unit 31 disposed on the upper side (inclined wall surface 31S) of the conveying path 2 on the extraction unit 1B side in the direction 51). The ceiling surface 3b on the charging portion 1A side is provided with a flue 7.

In the heating furnace 101 according to the first embodiment, the conveyance path 2 conveys the material to be heated in a direction orthogonal to the longitudinal direction.
Moreover, 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 disposed in each combustion region. In this embodiment, the furnace width direction temperature control unit 31 indicates a region where gradient heating can be performed, but whether or not the furnace width direction temperature control unit 31 performs gradient heating can be arbitrarily set. it can.

When the material to be heated is sequentially transported from the charging unit 1A side to the extracting unit 1B side by the transport path 2, the heating furnace 101 first stores heat between the charging unit 1A and the self-regenerative burner 51. The material to be heated is uniformly heated to a predetermined temperature by the type combustion burner 4.
Next, in the furnace width direction temperature control unit 31, the material to be heated is subjected to gradient heating or reverse gradient heating by the self-regenerative burner 51 to form a temperature gradient along the longitudinal direction in the material to be heated.

The to-be-heated material heat-processed by the heating furnace 101 of this embodiment is steel materials, such as a slab, billet, and bloom after casting, for example.
The material to be heated is subjected to gradient heating, reverse gradient heating, or uniform heating by the heating furnace 101, and then hot-rolled by a hot rolling mill (not shown) arranged at the subsequent stage of the heating furnace 101.

The material to be heated is sequentially conveyed by the conveyance path 2 provided in the heating furnace 101.
As the conveyance path 2, for example, a walking beam device that can sequentially convey the material to be heated can be used.
Further, the material to be heated is transported along the transport path 2 in a posture in which the longitudinal direction is directed in a direction substantially orthogonal to the transport direction. That is, the material to be heated is transported with its longitudinal direction arranged in a direction along the furnace width direction.

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

Further, the regenerative combustion burner 4 is arranged along the transport direction on the left and right sides of the transport direction of the transport path 2 on the upper side and the lower side of the transport path 2.
Specifically, the regenerative combustion burner 4 according to the present embodiment is disposed opposite to the left and right above the conveyance path 2 in the first heating region T1 from the charging unit 1A toward the extraction unit 1B, and alternates with each other. A plurality of upper regenerative combustion burners (heat storage combustion burners) 4A for combustion, and a plurality of lower regenerative combustion burners (heat storage combustion burners) disposed opposite to the left and right below the conveying path 2 and alternately combusting each other 4B. With this configuration, when the material to be heated is conveyed along the conveyance path 2, the material to be heated can be heated from the left and right on the upper side and the lower side.

In addition, when gradient heating or reverse gradient heating is performed in the furnace width direction temperature control unit 31, heat storage is performed in the furnace width direction temperature control unit 31 (the upper side of the conveyance path 2 near the extraction unit 1B) where the self-regenerative burner 51 is disposed. If the regenerative burner 4 is arranged and heated at the same time, the regenerative burner 4 is diluted by the regenerative burner 51 because the regenerative burner 4 dilutes the regenerative burner 4 because the regenerative burner 4 tries to uniformly heat the material to be heated. It is preferable not to arrange the regenerative combustion burner 4 in the temperature control unit 31. However, in the case of heating the material to be heated uniformly, the regenerative combustion burner 4 may be disposed on the upper side wall 3a ′ of the transport path 2 near the extraction unit 1B where the self-regeneration burner 51 is disposed.
On the other hand, a lower regenerative combustion burner 4B is disposed below the conveyance path 2 near the extraction unit 1B in order to heat the lower surface side of the material to be heated.

In the regenerative combustion burner 4, for example, alternating between the upper regenerative combustion burners 4 </ b> A and 4 </ b> A (or the lower regenerative combustion burners 4 </ b> B and 4 </ b> B) arranged opposite to both sides of the conveyance path 2. It is configured to burn.
When one of the left and right heat storage combustion burners burns, the other heat storage combustion burner sucks the combustion gas, thereby heating the heat storage material built in the other heat storage combustion burner. Next, when the other heat storage combustion burner is burned, the combustion heat is brought into contact with the heated heat storage material to preheat the air. By alternating combustion in this way, heat energy can be used efficiently.

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

  Moreover, in this embodiment, although the case where the regenerative combustion burner 4 and 4 arrange | positioned at the both right and left both sides of the conveyance path 2 carried out alternating combustion was demonstrated, for example, the regenerative combustion burner 4 and 4 and 4 which were arrange | positioned adjacently were demonstrated. You may make it burn alternately.

Specifically, in the second heating region T2 on the extraction unit 1B side from the arrangement position of the self-regeneration burner 51 on the most extraction unit side, alternating between the lower regenerative combustion burners 4B and 4B adjacent in the transport direction. It is preferable to burn. That is, as shown in FIG. 1, in the lower regenerative combustion burner 4 </ b> B, in the lower regenerative burner 4 </ b> B arranged in the second heating region T <b> 2 on the extraction unit 1 </ b> B side than the arrangement position of the self-regenerative burner 51. Adjacent burners (for example, lower heat storage combustion burners 4Ba, 4Ba shown in FIG. 3, lower heat storage combustion burners 4Bb, 4Bb, lower heat storage combustion burners 4Bc, 4Bc, lower heat storage combustion burners 4Bd and 4Bd) are preferably alternately burned.
Thus, in the 2nd heating area | region T2 by the side of the extraction part 1B rather than the arrangement position of the self-regenerative burner 51, the furnace width is obtained by alternating combustion between the lower regenerative combustion burners 4B and 4B arranged next to each other. It becomes possible to control the amount of combustion with respect to the direction, and in the case of performing gradient heating or reverse gradient heating, the temperature difference in the longitudinal direction of the material to be heated (temperature difference in the furnace in the furnace width direction) is more efficiently performed. Can be granted.

Next, the self-regeneration burner 51 will be described.
The self-regenerative burner 51 according to the present embodiment is, as shown in FIGS. 1 to 3, a furnace width direction temperature control formed on the upper side of the conveyance path 2 in an arbitrary region between the charging unit 1 </ b> A and the extracting unit 1 </ b> B. The unit 31 is disposed. Moreover, the furnace width direction temperature control part 31 has several combustion area | regions 31A-31D divided | segmented into 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 burner 51 includes a plurality of self-regenerative burners 51 in a predetermined direction along the furnace width direction above the conveying path 2 on the extraction unit 1B side from the installation position of the upper heat storage combustion burner 4A. They are arranged side by side at intervals.

The furnace width direction temperature control unit 31 is not limited to the upper side of the conveyance path 2, and is provided on at least one of the upper side and the lower side of the conveyance path 2 in an arbitrary region between the charging unit 1 </ b> A and the extraction unit 1 </ b> B. It only has to be arranged. In addition, the self-regenerative burner 51 is preferably disposed in each of a plurality of combustion regions obtained by dividing the furnace width direction temperature control unit 31 in the furnace width direction.
In addition, it is possible to arbitrarily set whether or not a plurality of self-regenerative burners 51 are arranged in each combustion region.

  In 1st Embodiment, it is preferable to employ | adopt the self-regenerative burner 51 as a gene burner arrange | positioned above the conveyance path 2 of the extraction part 1B side rather than the installation position of 4 A of upper side heat storage type combustion burners. The “self-regenerative burner” will be described below.

  The self-regenerative burner is a kind of regenerative combustion burner, but a normal regenerative burner (thermal storage combustion burner) alternately burns between a pair of (two) burners arranged opposite to each other as described above. In other words, the flame (flame) is intermittently released from each burner, whereas the self-regenerative burner has a structure in which two burners are arranged adjacent to each other, and the adjacent burners burn alternately. It is. The structure of the self-regeneration 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). The combustion supporting gas (for example, air) is a pair of heat storage bodies A and B (heat storage body A and heat storage body B) via a pair of air exhaust gas nozzles A and B (air exhaust gas nozzle A and 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 no combustion-supporting gas passes.

That is, the pair of heat storage bodies A and B (the heat storage body A and the heat storage body B) alternately repeat the role of being heated by the exhaust gas and the role of preheating the combustion-supporting gas. The self-regeneration burner includes a pair of adjacent heat storage bodies (heat storage body A and heat storage body B), and both the heat storage bodies share one burner tile and fuel nozzle C. Therefore, unlike a normal regenerative burner, frames are continuously emitted from one burner tile.
Therefore, the self-regenerative burner has the advantage that it has energy saving performance equivalent to that of a normal regenerative burner and is superior in space saving performance to a normal regenerative burner.

  In addition, in FIG. 4, although the two heat storage bodies (the heat storage body A and the heat storage body B) were formed separately and the example arrange | positioned adjacently mutually parallelly was given, two heat storage bodies (the heat storage body A and the heat storage body) were given. B) may be connected to one. Moreover, although the example which the shape of a burner tile is circular was given in FIG. 4, it is not limited to this, A rectangle or the refractory material of a furnace wall itself may be sufficient.

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

  Specifically, a part of the inclined wall surface 31S of the furnace chamber 3 is formed with a concave portion on the conveyance path side in the conveyance direction, and is a wall surface facing the extraction unit side in this concave portion. A burner mouth (burner tile) is arranged.

As shown in FIGS. 1 to 3, the self-regenerative burner 51 is disposed in each of the four combustion regions 31 </ b> A to 31 </ b> D that are equally divided in the furnace width direction along the transport direction in the furnace width direction temperature control unit 31. ing.
In the present embodiment, an example in which the furnace width direction temperature control unit 31 has four combustion regions that are equally divided in the furnace width direction is shown. The number can be set arbitrarily. Note that the number of combustion regions is preferably three or more, and 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. However, the present invention is not limited to equalizing the furnace width direction size of the combustion region, The dimensions in the furnace width direction of each combustion region can be set as appropriate according to the form of gradient heating.

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

  In the present embodiment, as shown in FIGS. 1 to 3, two self-regeneration burners 51 are arranged in one combustion region along the furnace width direction. However, the number of self-regeneration burners 51 in one combustion region is the same. May be determined appropriately 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 region is 2 or more.

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

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

It is necessary to adjust the combustion amount for each combustion region 31A to 31D of the self-regenerative burner according to the target temperature distribution in the longitudinal direction of the material to be heated.
For example, in the target temperature distribution in the longitudinal direction of the material to be heated, the heating target temperature at the front end of the material to be heated is t ₁ ° C, and the heating target temperature at the rear end is t ₂ ° C (for example, t ₁ > t ₂ ). Suppose that the temperature between the front end portion and the rear end portion is a temperature distribution that changes at a predetermined rate along the longitudinal direction of the material to be heated. In this case, the combustion amount for each of the combustion regions 31A to 31D of the self-regenerative burner is such that the temperature difference in the furnace width direction of the furnace chamber 3 is optimal so that the temperature distribution after heating of the heated material matches the target temperature distribution. It is preferable to adjust so that it becomes.

  The control of the combustion amount of the self-regenerative burner is not limited to the case where the combustion amount is decreased sequentially from the combustion region 31A toward the combustion region 31D as described above, but the combustion amount is sequentially increased from the combustion region 31A toward the combustion region 31D. May be increased. Further, uniform heating may be performed with the same amount of combustion from the combustion region 31A to the combustion region 31D.

Hereinafter, with reference to FIG. 5, the regeneration burner which concerns on the modification of 1st Embodiment is demonstrated. FIG. 5 is a conceptual diagram illustrating a schematic configuration of a modified example of the regenerative burner used in the heating furnace 101 according to the first embodiment.
In the said 1st Embodiment, although the self-regeneration burner 51 suitable as the regenerative burner 5 was demonstrated with reference to FIG. 4, it is not limited to the self-regeneration burner shown in FIG. A normal regenerative burner 51A may be used.

Second Embodiment
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a perspective view illustrating an example of a schematic configuration of a heating furnace according to the second embodiment of the present invention. In FIG. 6, the code | symbol 102 has shown the heating furnace.

  As shown in FIG. 6, the heating furnace 102 according to the second embodiment has, for example, a plurality of continuous types on both the left and right sides of the conveyance path 2 from the self-regenerative burner 51 arranged closest to the extraction unit 1B to the extraction side 1B. A combustion burner 6 is arranged.

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

The continuous combustion burner 6 forms a combustion frame shorter than the combustion frame formed by the regenerative combustion burner 4 in the furnace width direction. Further, the continuous combustion burner 6 burns only from the side where the temperature of the heated material is desired to be increased, or by increasing the amount of combustion on the side where the temperature of the heated material is desired to be increased. It is possible to locally heat the side on which it is desired to raise.
In addition, this continuous combustion burner 6 compensates for the insufficient heating amount generated in the rolling longitudinal direction of the material to be heated, and may be disposed (or operated) as necessary, and may be omitted. is there.
Since other points are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

<Third Embodiment>
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.
7 and 8 are diagrams for explaining an example of a schematic configuration of a 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 indicates a heating furnace.

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

The furnace width direction temperature control unit 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 disposed on the inclined wall surface 32S toward the extraction unit 1B side in each combustion region 32A to 32D of the furnace width direction temperature control unit 32 disposed on the charging unit 1A side, and toward the extraction unit 1B side. It comes to heat.

  In the heating furnace 103 according to the third embodiment, when the self-regenerative burner 52 is disposed in the first heating region T1 in addition to the second heating region T2, the heating material is subjected to inclined heating or reverse inclined heating. Thus, a more efficient and large amount of inclination can be imparted.

  7 shows an example in which the self-regenerative burner 52 is arranged in each of the combustion regions 32A to 32D that are equally divided into four along the furnace width direction, as in FIG. Is not limited to four and may be determined as appropriate. Further, the number of divisions does not have to 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 applied.

Further, as shown in FIGS. 7 and 8, even when the self-regeneration burner 52 is disposed also in the first heating region T1 from the charging unit 1A to the extraction unit 1B, the self-regeneration burner 52 is disposed from the position of the self-regeneration burner 52. A plurality of continuous combustion burners 6 as shown in FIG. 6 may be arranged on both the left and right sides of the conveying path 2 up to the arrangement of the burners 51.
Since other points are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

<Fourth embodiment>
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS.
9 and 10 are diagrams for explaining an example of a schematic configuration of a heating furnace according to the 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, a furnace width direction temperature control unit formed on the upper side of the conveyance path 2 between the charging unit 1 </ b> A and the extraction unit 1 </ b> B. 33 and a furnace width direction temperature control unit 34 formed on the lower side of the conveyance path 2 are formed. Each of the furnace width direction temperature controllers 33 and 34 has combustion regions 33A to 33D and 34A to 34D divided into four in the furnace width direction.

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

  In this way, a plurality of self-regenerative burners may be arranged in one heating region along the conveyance direction, and the conveyance path 2 is disposed in the second heating region T2 on the downstream side of the self-regeneration burner (regeneration burner) 53 in the conveyance direction. A self-regenerative burner (regenerative burner) 54 may be arranged on the upper side.

  In the heating furnace 104 according to the fourth embodiment, the self-regeneration burner (regeneration burner) 55 is also disposed below the self-regeneration burner (regeneration burner) 53, thereby heating the material to be heated from the lower side of the conveyance path 2. Therefore, when performing the gradient heating or the reverse gradient heating, it is possible to provide a more efficient and large amount of gradient.

  According to the heating furnace 104 according to the fourth embodiment, the self-regenerative burner (regeneration burner) 54 is also arranged on the downstream side of the self-regeneration burner (regeneration burner) 53, so that the material to be heated is inclined or heated reversely. When performing this, it is possible to impart a more efficient and large amount of inclination.

  In addition, in the heating furnace 104 according to the fourth embodiment, a regenerative burner (not shown) that corresponds to the self-regenerative burner 54 and injects toward the charging portion 1A may be disposed below the self-regenerative burner 54.

  It should be noted that any self-regeneration burner (not shown) corresponding to the self-regeneration burner 53, the self-regeneration burner 54, the self-regeneration burner 55, and the self-regeneration burner 54 (not shown) corresponding to the self-regeneration burner 54 located below the conveyance path 2 is selected. May be arranged.

  As described above, according to the heating furnace 104, by using the reself regenerative burners 53, 54, and 55 disposed on the inclined wall surface in the furnace as means for imparting an inclination to the longitudinal temperature distribution of the material to be heated. In addition, it is possible to stably perform gradient heating or reverse gradient heating, and the exhaust heat recovery rate can be remarkably improved, so that both temperature control in the longitudinal direction of the material to be heated and excellent energy saving are compatible. be able to.

  Moreover, according to the heating furnace 104, since the regenerative burner excellent in exhaust heat recovery is used, the fuel load (kcal / hour) is compared with the conventional inclination imparting means (such as a roof burner) for the temperature distribution of the material to be heated. Can be reduced by 3% at the maximum, and the manufacturing cost can be greatly reduced.

  Moreover, since the self-regenerative burners 53, 54, and 55 are arranged for each combustion region divided into a plurality along the furnace width direction, the target heating target is adjusted by adjusting the operation status for each combustion region. The inclination 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, the combustion load of the burner corresponding to the side where the temperature is desired to be increased while the temperature rise is suppressed. By reducing or stopping the combustion load of the burner, a temperature distribution having a steep slope can be imparted to the material to be heated.

Moreover, in the area | region of the extraction part side rather than the arrangement position of a self-regenerative burner, by making it burn alternately between adjacent lower thermal storage type combustion burners, a gradient is given to temperature distribution of a material to be heated more effectively. It becomes possible.
Furthermore, by arranging a plurality of continuous combustion burners on the left and right sides of the conveyance path from the installation position of the self-regeneration burner to the extraction side, a temperature gradient can be given to the material to be heated. A temperature gradient of 30 ° C. can be applied.

  According to the heating furnace according to the present invention, temperature control in the longitudinal direction (furnace width direction) of the material to be heated and energy saving can be achieved at the same time.

101, 102, 103, 104 ... heating furnace 1A ... charging part 1B ... extraction part 2 ... conveying path 3 ... furnace inner chamber 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 burner (regenerative burner)
4A ... Upper regenerative combustion burner (Regenerative combustion burner)
4B: Lower heat storage combustion burner (heat storage 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,
It is arranged in a first heating region formed along a conveyance path between a charging part for charging the heated material and an extracting part for extracting the heated material,
A plurality of regenerative combustion burners that are disposed above the conveyance path and opposite to the left and right of the conveyance path, and alternately burn with each other;
A plurality of regenerative combustion burners that are disposed below the conveyance path and opposite to the left and right of the conveyance path, and alternately burn with each other,
A regenerative burner disposed in a furnace width direction temperature control unit formed on at least one of the upper side and the lower side of the conveyance path between the extraction unit and the extraction unit,
With
The furnace width direction temperature controller is
A heating furnace having a plurality of combustion regions divided in a furnace width direction, wherein the regenerative burner is disposed in each of the combustion regions. The heating furnace according to claim 1,
The regenerative burner is disposed on the upper side of the conveyance path,
A heating furnace characterized in that, in a second heating region located closer to the extraction unit than the regenerative burner, the combustion is alternately performed between the regenerative combustion burners which are arranged below the conveyance path and are adjacent to each other. A heating furnace according to claim 1 or 2,
A heating furnace comprising a plurality of continuous combustion burners arranged on the left and right sides of the transfer path of the transfer path from the position where the regenerative burner is arranged to the extraction side. The heating furnace according to any one of claims 1 to 3,
A heating furnace characterized in that a plurality of regenerative burners are arranged in each of the combustion regions along the conveying direction.

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