JP7138487B2 - Regenerative alternating combustion device for heating furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a regenerative alternating combustion apparatus for a heating furnace, which is used in 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.

In addition, in order to improve productivity, hot rolling may be performed by gradually increasing the speed 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 rises, causing scale defects or exceeding the upper limit of the finish rolling temperature.
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.
This heating furnace has a plurality of pairs of alternately burning regenerative combustion devices (also referred to as regenerative combustion burners or regenerative burners) arranged on both the left and right sides of the conveying path of the material to be heated (slab), and further, A continuous combustion device is placed on the upper side of the transfer path from the middle of the transfer route to the outlet 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 is uniform. Or controlled arbitrarily.

Like the heating furnace described in Patent Document 1, in a heating furnace equipped with regenerative combustion burners, 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. , making it possible to control the temperature distribution in the width direction of the furnace, which was difficult with only 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 width direction of the furnace by using the continuous combustion device arranged on the ceiling wall, it is difficult to improve the energy efficiency. Therefore, there is a demand for a technique capable of efficiently and obliquely heating the material to be heated from above.

In addition, if a regenerative combustion device is used instead of the conventional continuous combustion device as a means of tilting heating from the ceiling side of the furnace, a pair of regenerative combustion devices must be arranged in the furnace height direction. There was a problem that the installation space was greatly restricted, and the equipment had to be excessively enlarged.
Furthermore, even if the regenerative combustion device is arranged adjacent to the furnace width direction, when adjusting the temperature of the inclined heating, the flame becomes too large especially on the high temperature side, and the spread of the injected flame may cause damage to the furnace wall. This could lead to damage to the installed refractories.

The present invention has been made in view of the above circumstances, and is capable of efficiently performing temperature control in the longitudinal direction (furnace width direction) of the material to be heated, as well as making the heating furnace compact (saving space) and heating furnace. It is an object of the present invention to provide a regenerative alternating combustion apparatus for a heating furnace, which is capable of ensuring the integrity of both.

The gist of the present invention, which aims to solve the above problems, is as follows.
[1] One or more fuel nozzles and a pair of air nozzles are arranged at least either above or below the conveying path of the material to be heated charged from the charging part of the heating furnace. and a flame inclined at a predetermined angle in a plan view of the heating furnace with respect to the direction in which the material to be heated is conveyed from the charging portion of the heating furnace to the extracting portion. and a pair of heat storage chambers arranged adjacent to each other, each housing a heat storage element, and connected to the pair of air/exhaust gas nozzles, wherein the pair of air/exhaust gas nozzles Heating the material to be heated by the flame injected by the burner while alternately heating the heat storage body and heating the discharged air by alternately performing the intake of the exhaust gas and the discharge of the air in each of the two . In the regenerative alternating combustion apparatus for a heating furnace, the pair of air/exhaust gas nozzles are arranged adjacent to each other in the width direction of the heating furnace, and when the heating furnace is viewed from above, the pair of air/exhaust gas nozzles The air and exhaust gas nozzles are inclined with respect to the conveying direction of the material to be heated so that the extension lines of the air and exhaust gas nozzles intersect, and when the heating furnace is viewed from above, the shape of the flame formed is expressed by the following formula (1) and A regenerative alternating combustion apparatus for a heating furnace, characterized by being adjusted so as to satisfy the following formula (2).
L×cos θ<L ₁ (1)
L×sin θ<L ₂ (2)
In the above formulas (1) and (2), L is the flame length (mm), and θ is the angle formed by the flame and the conveying direction of the material to be heated when the heating furnace is viewed from above. (°), L1 is the distance (mm) between the _point where the extension lines of the pair of air/exhaust gas nozzles intersect and the wall surface of the charging section or extraction section, and L2 is the _pair of air/exhaust gas nozzles. The distance (mm) between the point where each extension line intersects and the side wall surface on the side where the flame is inclined is shown.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to efficiently control the temperature of the material to be heated in the longitudinal direction (furnace width direction), and to achieve both compact equipment and maintenance of the heating furnace. A regenerative alternating combustion device can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view explaining an example of schematic structure of the heating furnace which concerns on one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the figure seen from the side explaining an example of the schematic structure of the heating furnace which concerns on one Embodiment of this invention. 1 is a plan view illustrating an example of a schematic configuration of a heating furnace according to an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram illustrating an example of the schematic configuration of a self-regenerative burner according to an embodiment of the present invention, where (a) is a plan view of the self-regenerative burner and (b) is a side view of the self-regenerative burner; It is a diagram. FIG. 2 is a partial cross-sectional view of a heating furnace in plan view for explaining a flame injection angle in the self-regenerative burner according to one embodiment of the present invention.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG.
1 to 3 are diagrams for explaining an example of the schematic configuration of a heating furnace according to one 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, and FIG. 3 shows a plan view. In the figure, reference numeral 1 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.

As shown in FIGS. 1 to 3, the heating furnace 1 of one embodiment includes a conveying path 2 for sequentially conveying the material to be heated from the charging section 1A side toward the extracting section 1B side, and extracting from the charging section 1A. A furnace chamber 3 formed along the conveying path 2 to the part 1B, a plurality of regenerative combustion burners (regenerative burners) 4 arranged on the left and right sides of the conveying path 2 in the conveying direction, and A plurality of self-regenerative burners (regenerative burners ) 5.

In the heating furnace 1 according to one 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 30 has a plurality of (for example, four) combustion regions 30A, 30B, 30C, and 30D divided in the furnace width direction, and a regenerative burner is arranged in each combustion region. ing. In this embodiment, the furnace width direction temperature control unit 30 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 30 can be arbitrarily set. can.

In the heating furnace 1, 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 stored between the charging section 1A and the self-regenerative burner 5. 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 30, the self-regenerative burner 5 performs inclined heating or reverse inclined heating of the material to be heated, thereby forming a temperature gradient along the longitudinal direction of the material to be heated.

Materials to be heated by the heating furnace 1 of the present embodiment are steel materials such as cast slabs, billets, and blooms. These materials to be heated are subjected to oblique heating or reverse oblique heating by the heating furnace 1 of the present embodiment, and then subjected to hot rolling by a hot rolling mill (not shown) disposed in the rear stage of the heating furnace 1. .

The material to be heated is sequentially conveyed by a conveying path 2 provided in the heating furnace 1 .
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 while being arranged such that its longitudinal direction is 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. For the regenerative burner 4, for example, an FDI (registered trademark (hereinafter the same)) (Fuel Direct Injection) type regenerative burner can be used. In the heating furnace 1 shown in FIGS. 1 to 3, the regenerative burner 4 is arranged on the side wall surface 3a of the furnace chamber 3, and the flame (frame) F is blown out along the width direction of the furnace. there is

In addition, the regenerative burners 4 are arranged along the conveying direction on the left and right side wall surfaces 3a of the conveying path 2 above and below the conveying path 2, and the regenerative burners 4 on both the left and right sides are arranged to face each other. ing.
Specifically, the regenerative burners 4 according to the present embodiment are arranged on both left and right sides above the conveying path 2 to face each other in the first heating region T1 from the charging portion 1A to the extracting portion 1B. and a plurality of upper regenerative combustion burners (regenerative combustion burners) 4A arranged below the conveying path 2 on both left and right sides facing each other, and a plurality of lower regenerative combustion burners (regenerative combustion burners) for alternating combustion. ) and 4B. With this configuration, when the material to be heated is conveyed along the conveying path 2 , the material to be heated can be heated from both the left and right sides above and below the conveying path 2 .

When the furnace width direction temperature control unit 30 performs tilt heating or reverse tilt heating, if the regenerative combustion burner 4 is arranged in the furnace width direction temperature control unit 30 and heated at the same time as the self-regenerative burner 5, regenerative combustion is performed. Since the inclined heating or reverse inclined heating is diluted by the burner 4 to uniformly heat the material to be heated, the temperature control unit 30 in the furnace width direction where the self-regenerative burner 5 is arranged (the transfer path 2 near the extraction unit 1B) It is preferable not to arrange the regenerative combustion burner 4 on the upper side). However, in the case of uniformly heating the material to be heated, the regenerative combustion burner 4 may be arranged above the conveying path 2 closer to the extraction section 1B where the self-regenerative burner 5 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.

Further, in the regenerative burner 4, for example, alternating combustion is performed between the upper regenerative combustion burners 4A, 4A (or the lower regenerative combustion burners 4B, 4B) arranged facing each other on both sides of the conveying path 2. is configured as

First, when one of the left and right regenerative burners burns, the other regenerative burner draws in the combustion gas of the one regenerative burner, thereby heating the heat storage material incorporated in the other regenerative burner. Next, when the other of the left and right regenerative burners is burned, air for combustion is brought into contact with the heated heat storage 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 case where alternating combustion is performed by the regenerative combustion burners 4, 4 arranged on both left and right sides of the conveying path 2 has been described, but for example, regenerative combustion burners arranged adjacent to each other along the conveying direction Alternating combustion may be performed between the burners 4,4.

Specifically, in the second heating region T2 on the extraction part 1B side of the arrangement position of the self-regenerative burner 5 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 on the extraction part 1B side of the arrangement position of the self-regenerative burner 5 , between adjacent burners (for example, lower regenerative combustion burners 4Ba shown in FIG. Alternating combustion is preferably performed by combustion burners 4Bd and 4Bd.

In this way, in the second heating region T2 on the extraction part 1B side of the position where the self-regenerative burner 5 is arranged, alternating combustion is performed by the lower regenerative combustion burners 4B, 4B arranged next to each other, 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 given.

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, self-regenerative burners have a structure in which two burners are placed adjacent to each other, and these adjacent burners alternately burn. is.

The structure of the self-regenerative burner will be described below with reference to FIG. 4A and 4B are schematic diagrams illustrating an example of a schematic configuration of a self-regenerative burner according to an embodiment, FIG. 4A is a plan view of the self-regenerative burner, and FIG. 4B is a self-regenerative burner. is a side view of the .

As shown in FIGS. 4(a) and 4(b), the regenerative alternating combustion apparatus (self-regenerative burner) 5 according to this embodiment includes a fuel nozzle 51a and a pair of air/exhaust gas nozzles 52a and 52b. and a pair of heat storage chambers 53 and 54 that house a heat storage element, are arranged adjacent to each other, and are connected to a pair of air/exhaust gas nozzles 52a and 52b.

It is a regenerative alternating combustion device that heats the material to be heated being conveyed in the heating furnace while alternately discharging air and taking in exhaust gas between the pair of regenerative chambers 53 and 54 . As shown in FIGS. 1 to 3, at least one regenerative alternating combustion device 5 is arranged above the material-to-be-heated conveying path 2 provided in the heating furnace 1 .
Note that the regenerative alternating combustion device 5 may be arranged not only above the conveying path 2 but also above or below the conveying path 2 . At least one or more regenerative alternating combustion devices 5 may be arranged.

As shown in FIGS. 4A and 4B, the self-regenerative burner 5 includes a burner portion 51 integrated with a pair of adjacent heat storage chambers (heat storage element 53 and heat storage element 54). The burner portion 51 continues to burn, but the combustion-supporting gas (for example, air) for combustion alternately passes through a pair of heat storage chambers 53 and 54, is preheated, and is supplied to the air/exhaust gas nozzle 52a (or the air/exhaust gas nozzle 52b). ). Exhaust gas generated by combustion is sent into the heat storage chamber through the air/exhaust gas nozzle 52b (or air/exhaust gas nozzle 52a) through which the combustion-supporting gas does not pass, and heats the heat storage medium.

That is, the pair of heat storage chambers 53 and 54 alternately repeats the role of being heated by the exhaust gas and the role of preheating the combustion-supporting gas. A pair of adjacent heat storage chambers 53 and 54 share one circular burner tile 55 . Therefore, unlike a normal regenerative burner, flames (frames) F are emitted continuously from one burner tile.

Therefore, the self-regenerative burner 5 according to the present embodiment has the advantage that it has energy saving properties equivalent to those of a normal regenerative burner and is more space-saving than a normal regenerative burner.

As shown in FIG. 5, the regenerative alternating combustion device 5a is adjusted so that the shape of the flame formed satisfies the following formulas (1) and (2) when the heating furnace is viewed from above. FIG. 5 is a schematic plan view of the heating furnace for explaining the injection angle of the flame. Further, the X direction in FIG. 5 represents the furnace length direction, and the Y direction represents the furnace width direction.

L×cos θ<L ₁ (1)
L×sin θ<L ₂ (2)
In the above formulas (1) and (2), L is the flame length (mm), and θ is the angle formed by the flame and the conveying direction of the material to be heated when the heating furnace is viewed from above (° ), L1 is the distance (mm) between the _point where the extension lines of the pair of air/exhaust gas nozzles intersect and the wall surface 3c of the charging section or the extraction section, and L2 is the distance between the _pair of air/exhaust gas nozzles. , and the distance (mm) between the intersection of the extension lines of and the side wall surface 3a on the side where the flame is inclined.

By adjusting the injection angle of the flame (frame) F so as to satisfy the above two expressions, that is, by adjusting the fuel nozzle 51a and the air/exhaust gas nozzle 52a (or the air/exhaust gas nozzle 52b), the integrity of the heating furnace can be increased.

Note that the regenerative alternating combustion device 5 according to the present embodiment heats the material to be heated while alternately performing air discharge and exhaust gas intake between the pair of regenerative chambers 53 and 54, so that the flame F , the flame F moves so that its tip traces an arc-shaped trajectory. That is, the flame F alternately moves toward and away from the side wall surface of the heating furnace. Therefore, from the viewpoint of maintenance of the side wall surface (furnace wall), it suffices that the above equation (2) is satisfied when the flame F is closest to the side wall surface.

In the present embodiment, in the regenerative alternating combustion device 5a, the point where the extension lines of the air/exhaust gas nozzle 52a and the air/exhaust gas nozzle 52b intersect (symbol X in FIG. 4(a)) and the fuel nozzle It is preferable to adjust the inclination angle β of the fuel nozzle 51a so that the extension lines of 51a intersect. That is, the flame is formed in the area where the air injection area and the fuel gas injection area intersect. It can suppress the generation of exhaust gas and ensure highly efficient combustion.

In addition, in all regenerative alternating combustion devices 5, it is not necessary to adjust the inclination angles of the fuel nozzle 51a, the air/exhaust gas nozzle 52a, and the air/exhaust gas nozzle 52b within the above range. From the viewpoint of preventing damage and maintaining the heating furnace, in particular, in the regenerative alternating combustion device 5a (see FIGS. 1 to 3) arranged on the furnace wall side of the heating furnace 1, the fuel nozzle 51a and the air/exhaust gas nozzle It is preferable to adjust the inclination angle of the air/exhaust gas nozzle 52a and the air/exhaust gas nozzle 52b within the above range.

Here, "L: flame length (mm)" in the above formulas (1) and (2) will be explained.
Generally, the method of determining the "flame length" can be exemplified by <1> a method of obtaining by combustion experiment and <2> a method of obtaining by calculation formula.

<1> The method of determination by combustion experiment is a method of directly measuring how far the visible flame extends in the horizontal direction by observing it in, for example, a box-type experimental furnace.

<2> The method of finding by the formula can be found by, for example, the following formula.
Flame length _Lf= γ×Qn×L3/(ρ×Cp× _√g ×β×T× ^{L35 /2} ₎ ⁿ ( ₃ )
where γ is a constant, Q is the heat generation density _, L3 is the absolute length of the fire source, ρ is the air density, _Cp is the specific heat, g is the gravitational acceleration, β is the volume expansion coefficient, and T is the absolute temperature of the atmosphere. , respectively.

Although FIGS. 1 to 3 show an example in which the burner tile 55 has a circular shape, it is not limited to this, and may have a polygonal (for example, rectangular) or other shape.

In addition, the self-regenerative burner 5 has a burner port (burner tile 55) disposed on the inclined wall surface 30S of the furnace chamber 3 so as to face obliquely downward toward the extraction section 1B.
Specifically, the ceiling surface 3b of the furnace inner chamber 3 is formed with a recess that is partially recessed toward the transport path 2 in the middle of the transport direction. A burner port (burner tile 55) of the self-regenerative burner 5 is arranged in the .

As shown in FIGS. 1 to 3, the self-regenerative burners 5 are arranged in four evenly divided combustion regions 30A to 30D along the furnace width direction. In this embodiment, an example in which the number of combustion regions is four is shown, but the number of combustion regions is preferably two or more, and more preferably three to four.
The position (distance from the charging portion 1A) of the self-regenerative burner 5 is not particularly limited, and may be determined as appropriate from the longitudinal temperature difference (inclined heating amount) of the material to be heated.

In this embodiment, as shown in FIGS. 1 to 3, two self-regenerative burners 5 are arranged in one combustion region along the furnace width direction. The number 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 5 in one combustion zone is two or more.

The self-regenerative burner 5 can adjust the amount of combustion for each of the combustion regions 30A-30D. For example, the self-regenerative burner in the combustion area 30A on one end in the furnace width direction is burned with a certain rated combustion amount, and the self-regeneration burner in the adjacent combustion area 30B is burned with a combustion amount smaller than that in the combustion area 30A. , the self-regenerative burner in the combustion area 30C is burned with a smaller amount of combustion than in the combustion area 30B, and the self-regenerative burner in the combustion area 30D is burned with a smaller amount of combustion than in the combustion area 30C. It is possible to let

Thereby, below the self-regenerative burner 5, it is possible to incline the furnace temperature in the furnace chamber 3 along the furnace width direction.

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 30A toward the combustion area 30D as described above, but the combustion amount is sequentially decreased from the combustion area 30A toward the combustion area 30D. may be increased. Further, uniform heating may be performed by setting the combustion amount of all the combustion regions 30A to 30D to be the same.

As described above, according to the present invention, by using the self-regenerative burner arranged on the ceiling surface in the furnace as a means for imparting an inclination to the temperature distribution in the longitudinal direction of the material to be heated, stable inclined heating or Since it is possible to apply reverse inclination 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 material to be heated and excellent energy saving.

Further, in the self-regenerative burner of the present invention, compared with the conventional regenerative burner, the pair of heat storage bodies and the burner part are integrated, and even when adjusting the temperature of the inclined heating, the flame length can be expressed by the formula (1) and within the range of formula (2), the inclination angles of the combustion nozzle and the air/exhaust gas nozzle are adjusted so that the refractory provided on the furnace wall is not damaged by the injected flame. It is possible to achieve both compactness (space saving) and maintenance of the heating furnace.

In addition, since the self-regenerative burner is arranged in each combustion area divided into a plurality along the furnace width direction, the target temperature distribution of the material to be heated can be achieved by adjusting the operating status of each combustion area. The degree of tilt 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 the above embodiment, the self-regenerative burner burns the flame toward the extraction section of the heating furnace, but it may burn toward the charging section.

According to the regenerative alternating combustion apparatus for a heating furnace according to the present invention, the temperature control in the longitudinal direction (furnace width direction) of the material to be heated can be efficiently performed, and the heating furnace can be made compact (space saving) and heating. Since it is possible to ensure the integrity of the furnace, it is industrially applicable.

REFERENCE SIGNS LIST 1 heating furnace 1A charging section 1B extracting section 2 conveying path 3 furnace inner chamber 3a furnace wall surface, side wall surface 3b ceiling surface 3c Wall surface 30 of the charging or extracting unit Furnace width direction temperature control unit 30S: Inclined wall surfaces 30A, 30B, 30C, 30D Furnace width direction temperature control unit 4: Regenerative alternating combustion device (regenerative burner)
4A: Upper regenerative combustion burner (regenerative combustion burner)
4B: Lower regenerative combustion burner (regenerative combustion burner)
5, 5a: Regenerative alternating combustion device (self-regenerative burner)
51 Burner portion 51a Fuel nozzles 52a, 52b Air/exhaust gas nozzles 53, 54 Thermal storage chamber 55 Burner tile
F... flame (frame)
T1: First heating area
T2・・・Second heating area
X・・・Point where extension lines of a pair of air/exhaust gas nozzles intersect

Claims (1)

One or more arranged at least either above or below the conveying path of the material to be heated charged from the charging section of the heating furnace,
The heating furnace has a single fuel nozzle and a pair of air/exhaust gas nozzles , and the heating furnace is plane with respect to the conveying direction of the material to be heated that is conveyed from the charging section of the heating furnace toward the extraction section. a burner section that injects a flame inclined at a predetermined angle toward the side wall when viewed ;
a pair of heat storage chambers arranged adjacent to each other, each housing a heat storage element, and connected to each of the pair of air/exhaust gas nozzles;
Each of the pair of air/exhaust gas nozzles alternately performs intake of exhaust gas and discharge of air, and alternately heats the heat storage body and heats the discharged air, while the burner section A regenerative alternating combustion device for a heating furnace that heats a material to be heated by an ejected flame,
The pair of air/exhaust gas nozzles are arranged adjacent to each other in the furnace width direction of the heating furnace, and when the heating furnace is viewed from above, the extension lines of the pair of air/exhaust gas nozzles intersect. inclined with respect to the conveying direction of the material to be heated,
A regenerative alternating combustion apparatus for a heating furnace, characterized in that the shape of the flame formed when the heating furnace is viewed from above is adjusted so as to satisfy the following equations (1) and (2).
L×cos θ<L ₁ (1)
L×sin θ<L ₂ (2)
In the above formulas (1) and (2), L is the flame length (mm), and θ is the angle formed by the flame and the conveying direction of the material to be heated when the heating furnace is viewed from above. (°), L1 is the distance (mm) between the _point where the extension lines of the pair of air/exhaust gas nozzles intersect and the wall surface of the charging section or extraction section, and L2 is the _pair of air/exhaust gas nozzles. The distance (mm) between the point where each extension line intersects and the side wall surface on the side where the flame is inclined is shown.

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