JP4953369B2 - Regenerative burner - Google Patents

Description

  The present invention relates to a regenerative burner used in an industrial combustion furnace.

  In recent years, regenerative burners have been used in industrial combustion furnaces in order to improve fuel efficiency. As shown in Patent Document 1 and Patent Document 2, this heat storage type burner is a burner having a heat storage body in the air supply / exhaust path of the burner, and alternately repeats combustion and exhaust in a relatively short period of about 30 seconds. The combustion gas retains the heat stored in the exhaust burner, and the combustion burner preheats the combustion air through the heat accumulator to achieve high thermal efficiency. is there.

  Such a heat storage burner has a structure in which the combustion section and the heat storage section are integrated, as shown in FIG. 7, for example. The burner tile 51 has a very complicated shape because the fuel gas injection port 52 opened to the furnace interior 55 side is provided at the center and the plurality of air injection ports 53 are provided around the burner tile 51. This burner tile 51 is formed of an integrally molded product of refractory. The inside of the burner tile 51 is filled with a heat storage body 54, and high-temperature exhaust gas sucked from the furnace interior 55 and combustion air supplied from the outside of the furnace 56 flow alternately in that portion. Abrupt temperature changes repeatedly occur inside the burner tile 51. However, since the burner tile 51 of such a heat storage burner has a complicated shape, a large thermal stress is likely to be generated due to a temperature difference between the inside and outside of the burner tile 51, so that it has been conventionally damaged and has a problem in durability.

  Therefore, in Patent Document 3, as shown in FIG. 8, by dividing the burner tile 61 into a plug-shaped inner tile 61a and a cylindrical outer tile 61b, the tile shape can be simplified and durability can be improved. Possible heat storage burners have been proposed. However, even if such a structure is adopted, especially when a regenerative burner with this structure is used in a high-temperature combustion furnace of 1400 ° C. or higher, such as ceramic firing, or batch-type combustion in which heating and cooling are repeated frequently When a regenerative burner of this structure is used in the furnace, after a certain period of time, the outer tile 61b begins to crack, and gradually approaches the inside 62 of the furnace together with the inner tile 61a in which the damaged portion of the outer tile 61b is fitted. In some cases, the trouble of dropping into the furnace 62 may occur.

  Thus, as a result of repeated verification to solve this problem, it was found that the burner tile 61 is damaged not only by the thermal stress of the tile itself but also by the following stress. The inside of the burner tile 61 is filled with a heat storage body 63 such as a spherical shape or a ring shape, and high-temperature exhaust gas flows through that portion, so the burner tile 61 and the heat storage body 63 are heated to a temperature close to the high furnace temperature. Is done. At that time, a thermal expansion difference is generated between the heat storage body 63 and the burner tile 61. Initially, the heat storage body 63 flows while repeating expansion and contraction according to a temperature change, so that the stress is relieved. However, among them, the heat storage body 63 is closely packed by the rearrangement, and finally, the heat storage body 63 is firmly stacked. As a result, the burner tile 61 receives a large pressure due to the thermal expansion difference from the stacked heat storage body 63 inside, and the stress a from the heat storage body 63 acts on the burner tile 61.

The pressure at which the stacked heat accumulator 63 pushes the burner tile 61 at this time is estimated based on experiments and the like. As a result, the pressure varies depending on the shape and material of the heat accumulator 63, the temperature, and the state of the stack. I found out. Actually, if the burner tile 61 has a complicated shape or receives an external force at a minute part, stress concentration occurs inside the burner tile 61, and stress is applied several to several tens of times. Become. On the other hand, the strength of the refractory used for the burner tile 61 is about 10 to 100 MPa in compressive strength and about 1 to 10 MPa in tensile strength, and the tensile strength is very weak. Therefore, for example, in the case of the burner tile 61 as shown in FIG. 8, the inner tile 61a pushed from the heat storage body 63 pushes the cylindrical outer tile 61b fitted with the taper surface 61c. As a result, the outer tile 61b As shown in FIG. 8, the stress acts in the front direction b and the radial direction c, and a portion where tensile stress acts on the outer tile 61b is generated. As described above, since the strength of the refractory 63 is very weak against tension, if the thermal storage burner is continuously operated, cracks such as a torn piece or a radial crack enter the outer tile 61b, and the burner tile 61 is placed on the furnace 62 side. It will come out. In the worst case, the burner tile 61 falls into the furnace 62 and the heat storage burner not only breaks down, but also destroys the object to be heated, resulting in a very large damage. .

Accordingly, there has been a demand for the development of a heat storage burner that can withstand the stress from the heat storage body 63.
Japanese Patent Publication No. 51-47131 No. 03-46742 JP-A-10-196935

  Provided is a heat storage burner in which a burner tile can withstand stress from a heat storage body.

The present invention made to solve the above problems comprises a heat storage section in which combustion air and exhaust gas are circulated, in which a heat storage body is disposed, heats the heat storage body with exhaust gas, and stores heat. In a regenerative burner that circulates combustion air through the heat storage unit, exchanges heat with a stored heat storage body, preheats, burns the preheated combustion air, and alternately and repeatedly operates heat storage and combustion. ,
The outer edge has a tapered surface configured to become smaller from the outside of the furnace toward the inside of the furnace, and has a fuel injection port that communicates between the heat storage section side and the inside of the furnace substantially at the center, and the fuel supply pipe is connected to the fuel injection pipe. An inner tile disposed inside the furnace of the heat storage section, inserted and held at the outlet,
The entire inner surface is fitted with the tapered surface, and the front tile is divided into a plurality of portions in the circumferential direction in a cylindrical shape that is wrapped around the outside of the inner tile.
On the outside of the furnace of the front tile, a cylindrical trunk tile provided coaxially with the front tile,
Holding the front tile and the body tile on its inner peripheral surface, and having a cylindrical metal holding member embedded in the furnace wall,
The holding member is provided with a misalignment prevention hook projecting inward at the furnace inner tip, and having a diameter-enlarged portion at the furnace outer tip,
The space composed of the inner tile, front tile, and body tile is used as the heat storage section, and the heat storage section and the inside of the furnace communicate with each other between the inner tile and the front tile. An air outlet is formed.

  In addition, it is preferable to form a slit that communicates between the inside and the outside of the holding member.

  Moreover, it is preferable to comprise an inner tile with a fireproof material, and to comprise a front tile and a trunk | drum tile with a fireproof heat insulating material.

  Moreover, it is preferable that the angle which the taper surface of an inner tile and the axial direction of an inner tile cross is 10-20 degrees.

  An inner tile having a tapered surface configured such that the outer edge decreases from the outside of the furnace toward the inside of the furnace, and the outside tile of the inner tile that fits with the tapered surface of the inner tile is divided into a plurality of circumferential directions. Since the front tile is held by the inner peripheral surface of the cylindrical metal holding member, even if the inner tile is pressed by the stress from the heat storage body The taper surface presses the front tile divided into a plurality in the circumferential direction toward the holding member, and a drag is generated on the front tile. This drag causes friction between the front tile and the holding member. Force is generated and it is possible to prevent the front tile from being pushed out into the furnace. Even when the inner tile is pressed by the stress from the heat storage body, only the compressive stress acts on the inner tile and the front tile, and tensile stress is generated on the holding member, but the holding member is made of metal. Since it is made of, it can withstand the tensile stress, and the regenerative burner will not be damaged.

In addition, the front tile's anti-displacement hook is projected inward at the furnace inner tip, and the holding member having the enlarged diameter part is provided at the furnace outer tip. When there is a gap between the front tile and the holding member and no frictional force is generated between the front tile and the holding member, it is possible to prevent the front tile from shifting.

  In addition, if the holding member is provided with a slit that communicates between the inside and the outside, the slit enables the thermal expansion of the holding member to be released, and the holding member expands due to the thermal expansion and the drag is reduced. It is possible to prevent a reduction in the frictional force acting between the holding member and the holding member.

  In addition, when the inner tile is made of a refractory material, the inner tile can be prevented from being damaged even if the inner tile is exposed to a high temperature and a thermal stress is generated. Further, when the front tile and the body tile are made of a fireproof heat insulating material, the heat insulating action of the front tile and the body tile prevents the metal holding member from being exposed to a high temperature, and It is possible to prevent the strength from decreasing.

  Further, when the angle between the taper surface of the inner tile and the axial direction of the inner tile is 10 to 20 °, the force between the front tile and the holding member is larger than the force that the front tile tends to approach the inside of the furnace. Thus, the frictional force generated at the top is increased, and the front tile can be prevented from being pushed out into the furnace.

(First embodiment)
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of a regenerative burner showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. As shown in FIG. 1, the heat storage burner of the present invention mainly includes an inner tile 1, a front tile 2, a trunk tile 3, a heat storage portion 4, a holding member 5, a burner front heat insulating material 6, and a fuel supply pipe 7. It is composed of

  The holding member 5 has a cylindrical shape, is inserted into an attachment hole 11 formed in the furnace wall 10 of the combustion furnace, and is embedded in the furnace wall 10. In this embodiment, the holding member 5 has a cylindrical shape. The holding member 5 is made of metal, and is preferably a heat resistant metal such as SUS310 or Inconel (registered trademark, Ni—Cr, or Ni—Cr—Fe alloy). At the tip of the holding member 5 on the side of the furnace 12, a shift preventing hook 5 a is projected inward.

The inner tile 1 is disposed on the furnace inner side 12 of the heat storage unit 4. Since the inner tile 1 is exposed to a high temperature, the inner tile 1 is made of a refractory material such as a dense refractory brick having heat resistance and high strength. The outer edge of the inner tile 1 has a tapered surface 1a configured to become smaller from the outside of the furnace 13 toward the inside of the furnace 12. In the present embodiment, the cross section of the inner tile 1 has a circular shape, and the inner tile 1 has a substantially truncated cone shape. Near the center of the inner tile 1 is formed a fuel injection port 1b in which the heat storage section 4 side and the furnace interior 12 side communicate with each other. The fuel supply pipe 7 is inserted into the fuel injection port 1b from the heat storage section 4 side, and the fuel supply pipe 7 is held by the fuel injection port 1b. Fuel is supplied from the fuel supply pipe 7. In this embodiment, gaseous fuel such as liquefied petroleum gas (LPG) or liquefied natural gas (LNG) is used. However, liquid fuel such as kerosene may be mixed with combustion air.

The front tile 2 has a substantially cylindrical shape, and is divided in the circumferential direction at a certain angle as shown in FIG. In the present embodiment, the front tile 2 is divided into three pieces in the circumferential direction. The entire surface of the front tile 2 is fitted around the tapered surface 1 a of the front tile 1 and is wrapped around the outside of the inner tile 1. The outer peripheral surface of the front tile 2 is in contact with the inner peripheral surface of the holding member 5, and the front tile 2 is held by the inner peripheral surface of the holding member 5. The front tile 2 is made of a porous fireproof heat insulating brick or a castable fireproof heat insulating material so as to insulate from the high temperature inside the furnace 12 and protect the holding member 5 from high temperature to 800 ° C. or less. Yes.

  The trunk tile 3 has a substantially cylindrical shape. The trunk tile 3 is arranged coaxially with the front tile 2 on the outside tile 13 side of the front tile 2. The outer peripheral surface of the trunk tile 3 and the inner peripheral surface of the holding member 5 are in contact with each other, and the trunk tile 3 is held by the inner peripheral surface of the holding member 5. The trunk tile 3 is made of a porous castable refractory heat insulating material so as to protect the holding member 5 from high temperature by heat insulation and to be 800 ° C. or lower.

  A fitting protrusion 3a having a shape protruding toward the furnace 12 direction is provided on the front end of the trunk tile 3 on the furnace inner side 12 so as to protrude toward the furnace 12 direction. A fitting recess 2 a having a shape corresponding to the fitting protrusion 3 a is formed on the outside tile 13 side of the front tile 2. The fitting protrusion 3a and the fitting recess 2a are matched, and the trunk tile 3 and the front tile 2 are fitted. The mating surfaces of the trunk tile 3 and the front tile 2 are filled with an irregular refractory 8 such as mortar. In this manner, the fitting protrusion 3a protruding forward over the entire circumference is provided at the front end in the furnace 12 of the trunk tile 3, and the trunk tile 3 and the front tile 2 are fitted with the fitting protrusion 3a. Since the mating surface of the trunk tile 3 and the front tile 2 is filled with the irregular refractory material 8 such as mortar, the high temperature exhaust gas from the heat storage section 4 is prevented from being ejected to the holding member 5. The holding member 5 is prevented from being exposed to a high temperature and the strength is lowered.

  Thus, in this embodiment, since it was made into the 2 body structure which consists of the trunk | drum tile 3 by the side of the furnace 13 and the front part tile 2 by the side of the furnace 12, compared with the case where it is a 1 body structure, it is a burner. It becomes possible to reduce the thermal stress acting on the tile.

  A space constituted by the inner tile 1, the front tile 2, and the trunk tile 3 is a heat storage unit 4. The heat storage unit 4 is provided with a heat storage body 9 made of a refractory material. For the heat storage body 9, for example, a filler having a spherical shape or a cylindrical shape is used. The heat storage body 9 is held by a wire net provided on the outside of the furnace 13 side of the heat storage unit 4.

  As shown in FIG. 1 and FIG. 2, a combustion air jet 1 c is formed between the inner tile 1 and the front tile 2 so that the heat storage section 4 side and the furnace interior 12 side communicate with each other. The width dimension m of the combustion air outlet 1c is smaller than the dimension of the heat accumulator 9, so that the heat accumulator 9 cannot pass through.

The outside of the furnace 13 side of the heat storage unit 4 is a supply / exhaust port 4a. Combustion air is supplied from the supply / exhaust port 4a, and exhaust gas is exhausted. By operating a blower (not shown) provided outside the furnace and switching the switching valve 20 for a predetermined time (for example, 30 seconds), the supply of combustion air and the exhaust gas are alternately performed. It has become.

(Operation of the present invention)
Next, the operation of the present invention will be described. At the time of combustion, the blower is operated, and combustion air is supplied from the air supply / exhaust port 4a through the heat accumulator 4 to the furnace air 12 from the combustion air injection port 1c, and the fuel supplied from the fuel injection port 1b is combusted. . When the predetermined time has elapsed, the switching valve 20 is switched, the blower is operated, the exhaust gas is sucked from the air supply / exhaust port 4a, and the exhaust gas is exhausted from the inside of the furnace 12 to the outside of the furnace 13. At this time, high-temperature exhaust gas flows through the heat storage unit 4, and heat exchange is performed by the exhaust gas coming into contact with the surface of the heat storage unit 9 filled in the heat storage unit 4 to heat the heat storage unit 9. Is stored.

  After the predetermined time has elapsed, the switching valve 20 is switched again to supply combustion air from the air supply / exhaust port 4a. At this time, the combustion air flows through the heat storage section 4 and comes into contact with the surface of the heat storage body 9 where the heat is stored, so that the combustion air is heat-exchanged and preheated, and the combustion air is ejected from the combustion air outlet 1c. 12 is supplied. In this way, heat storage and combustion are alternately repeated to operate, the retained heat of the combustion exhaust gas is recovered by the heat storage body 9, and the combustion air is preheated through the heat storage body 9, thereby achieving high thermal efficiency. Can improve fuel efficiency.

  FIG. 3 shows a detailed view of the main part. The heat accumulator 9 is heated to a temperature close to a high furnace temperature (1000 ° C. to 1600 ° C., 1400 ° C. in the present embodiment). At that time, a difference in thermal expansion occurs between the heat storage body 9 and the inner tile 1, the front tile 2, and the body tile 3, but at first, the heat storage body 9 flows while repeating expansion and contraction according to the temperature change. Stress is relieved. However, among them, the heat storage elements 9 are closely packed by the rearrangement, and finally, the heat storage elements 9 are firmly stacked. As a result, the inner tile 1 receives a large pressure due to the difference in thermal expansion from the stacked heat accumulators 9 inside, and the stress d from the heat accumulator 9 acts on the inner tiles 1 on the furnace inner side 12.

  Due to the stress d, the stress e acts on the front tile 2 in a direction perpendicular to the tapered surface 1a. When the taper angle f is an intersection angle between the taper surface 1a and the inner tile 1 (hereinafter simply referred to as an axial direction), the intersection angle between the stress e and the direction perpendicular to the axis direction is the same as the taper angle f. It becomes. The stress e is decomposed into a horizontal component g (stress e × sinf) in the axial direction and a vertical component h (stress e × cosf) in the vertical direction. The stress d and the horizontal component force g are equal. Since the front tile 2 is divided in the circumferential direction, the front tile 2 can move outward, and the holding member 5 is pressed by the vertical component force h acting on the front tile 2. A drag force i acts on the tile 2. When the front tile 2 is pushed in the furnace 12 direction, a frictional force j is generated between the holding member 5 and the front tile 2. The frictional force j is j = i × k, where k is the coefficient of static friction between the holding member 5 and the front tile 2. When the horizontal component force g is equal to or less than the frictional force j, the front tile 2 does not protrude toward the furnace 12 direction. In the present invention, since the taper angle f is set to 10 to 20 ° which is a preferable angle, the horizontal component force g becomes equal to or less than the frictional force j, and the front tile 2 does not squeeze out in the furnace 12 direction.

The strength of the inner tile 1 and the front tile 2 is 10 to 100 MPa in compressive strength and 1 to 10 MPa in tensile strength, and the tensile strength is extremely weak. In the present invention, since the front tile 2 is wrapped around the outer side of the inner tile 1 so as to be fitted to the tapered surface 1a of the inner tile 1, the inner tile 1 is pressed by the stress d from the heat storage body 9. Even so, only the compressive stress acts on the inner tile 1 and the front tile 2, and no tensile stress acts on the inner tile 1 and the front tile 2, so that the inner tile 1 and the front tile 2 are not damaged. Further, the front tile 2 is pressed outward toward the holding member 5, and tensile stress acts in the circumferential direction of the holding member 5 in an attempt to spread, but the holding member 5 is made of metal, There is strength against tensile stress, and the holding member 5 is not damaged. When the holding member 5 is made of SUS310S, the tensile strength at 800 ° C. is about 200 MPa, which is sufficient in strength. In the case where the holding member 5 is made of Inconel (registered trademark), there is further strength.

  FIG. 4 shows a detailed view of the holding member 5. When the holding member 5 becomes high temperature, it expands outward due to thermal expansion. When the diameter of the holding member 5 is 400 mm and the holding member 5 reaches 800 ° C., the outer periphery of the holding member 5 is about 10 to 20 mm longer. When the holding member 5 expands to the outside due to thermal expansion, a gap is formed between the holding member 5 and the front tile 2, and the drag i as described above does not occur or the drag i is small. Thus, when the frictional force j between the holding member 5 and the front tile 2 becomes smaller than the horizontal component force g, the front member 5 is pushed out toward the furnace 12 direction. For this reason, as shown in FIG. 4, a plurality of slits 5 b are formed in the holding member 5 so that the inside and the outside communicate with each other and extend from the front end in the furnace 12 side toward the outside of the furnace 13 side at a certain angle. did. As described above, since the slit 5b is formed in the holding member 5, the holding member 5 spreads outward due to thermal expansion, the frictional force j is reduced, and the front tile 2 is prevented from being pushed out toward the furnace 12 side. ing.

  On the other hand, when the slit 5 b is formed in the holding member 5, the holding member 5 is bent and the drag force i is lowered. Therefore, the rib 5 c is provided on the outer surface of the holding member 5 at a certain angle, and the holding member 5 is provided. Prevents bending.

As shown in FIG. 1, FIG. 3, and FIG. 4, a hook 5 a for preventing misalignment of the front tile protrudes inward from the front end of the holding member 5 on the furnace side 12. When the operation of the heat storage burner is started, the front tile 2 is not pushed outward by the inner tile 1, and there is a gap between the front tile 2 and the holding member 5, and the front tile 2 and the holding member 5 are rubbed. When the force j is not generated, the front tile 2 is prevented from being displaced toward the furnace 12 side by contacting the front end 2 of the front tile 2 with the hook 10a for preventing misalignment. On the other hand, when the heat storage burner is operated and a predetermined time has elapsed, as described above, the front tile 2 is moved into the furnace 12 by the frictional force j generated between the front tile 2 and the holding member 5. It prevents it from coming out to the side.

As shown in FIG. 1 and FIG. 3, the furnace 12 side tip of the holding member 5 and the shift prevention hook 5 a are covered with a burner front heat insulating material 6. The burner front heat insulating material 6 is composed of a low heat conductive fireproof heat insulating material, for example, a ceramic fiber heat insulating material. As described above, the furnace 12 side tip of the holding member 5 and the slip prevention hook 5a are covered with the burner front heat insulating material 6 so that the furnace member 12 side tip of the holding member 5 and the slip prevention hook 5a are in the furnace having a high temperature. Direct contact with the gas is prevented, and the strength of the holding member 5 is prevented from decreasing due to the high temperature of the tip of the holding member 5 on the furnace side 12 and the shift prevention hook 5a. As shown in FIG. 1, an enlarged diameter portion in contact with the outer surface of the furnace wall 10 is formed at the front end of the holding member 5 outside the furnace.

  In addition, when gaps are generated between the inner tile 1 and the front tile 2, the dividing surface of the front tile 2, and the front tile 2 or the trunk tile 3 and the holding member 5 during assembly, these gaps are generated. In order to protect the holding member 5 from a high temperature, it is preferable to fill an irregular refractory such as mortar.

(Embodiment 2)
Next, the second embodiment will be described. A second embodiment is shown in FIG. In the second embodiment, a portion of the combustion air jet 1d of the inner tile 1 that is open to the furnace 12 side is parallel to the fuel jet 1b. If comprised in this way, since a combustion air jet is injected in parallel with a fuel jet, mixing of a fuel and combustion air will become slow combustion, and the effect that NOx (nitrogen oxide) discharge | emission amount will reduce as a result. There is.

(Third embodiment)
Next, a third embodiment will be described. A third embodiment is shown in FIG. In the third embodiment, the combustion air outlet 1e has a vertically long slit shape, and is opposed to each other. In order to form such a combustion air jet 1e, the inner tile 1 has a quadrangular cross section, and the front tile 2 has a shape corresponding to the inner tile 1 and is divided into four. When configured in this manner, the combustion air jet sandwiches the fuel jet from both sides, so that the flame shape becomes flat and there is an advantage that combustion can be performed in a narrow space.

  Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. However, the present invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and a regenerative burner with such a change should also be understood as being included in the technical scope. I must.

It is a sectional side view of the heat storage type burner which shows embodiment of this invention. It is AA sectional drawing of FIG. It is detail drawing of the principal part. It is detail drawing of a holding member. It is a sectional side view which shows 2nd Embodiment. It is a front sectional view showing a third embodiment. (A-A sectional view of FIG. 1) It is a sectional side view of the thermal storage type burner which shows the conventional embodiment. It is a sectional side view of the thermal storage type burner which shows the conventional embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner tile 1a Tapered surface 1b Fuel jet 1c Combustion air jet (1st Embodiment)
1d Combustion air outlet (second embodiment)
1e Air outlet for combustion (third embodiment)
DESCRIPTION OF SYMBOLS 2 Front tile 2a Fitting recessed part 3 Trunk part tile 3a Fitting protrusion 4 Heat storage part 4a Air supply / exhaust port 5 Holding member 5a Shifting prevention hook 5b Slit 5c Rib 6 Burner front heat insulating material 7 Fuel supply pipe 8 Indeterminate refractory 9 Heat storage body 10 Furnace wall 11 Mounting hole 12 Furnace 13 Outside the furnace 20 Switching valve 51 Burner tile 52 Fuel gas outlet 53 Air outlet 54 Heat storage body 55 In the furnace 56 Outside the furnace 61 Burner tile 61a Plug-like inner tile 61b Outer tile 61c Tapered surface 62 Inside the furnace 63 Heat storage body a Stress from the heat storage body b Forward stress c Axial stress d Stress acting on the inner tile e Stress acting on the front tile f Taper angle g Horizontal component of the stress e h Vertical component force of stress e i Drag j Friction force k Static friction coefficient m Width of combustion air outlet

Claims (4)

It has a heat storage part in which a heat storage body is disposed, in which combustion air and exhaust gas circulate, heats the heat storage body with exhaust gas to store heat, and distributes combustion air to the heat storage part to store heat. In a regenerative burner that performs heat exchange with the regenerator and preheats, burns the preheated combustion air, and operates by repeatedly repeating heat storage and combustion,
The outer edge has a tapered surface configured to become smaller from the outside of the furnace toward the inside of the furnace, and has a fuel injection port that communicates between the heat storage section side and the inside of the furnace substantially at the center, and the fuel supply pipe is connected to the fuel injection pipe. An inner tile disposed inside the furnace of the heat storage section, inserted and held at the outlet,
The entire inner surface is fitted with the tapered surface, and the front tile is divided into a plurality of portions in the circumferential direction in a cylindrical shape that is wrapped around the outside of the inner tile.
On the outside of the furnace of the front tile, a cylindrical trunk tile provided coaxially with the front tile,
Holding the front tile and the body tile on its inner peripheral surface, and having a cylindrical metal holding member embedded in the furnace wall,
The holding member is provided with a front tile misalignment prevention hook projecting inward at the furnace inner tip, and having an enlarged diameter portion at the furnace outer tip,
The space composed of the inner tile, front tile, and body tile is used as the heat storage section, and the heat storage section and the inside of the furnace communicate with each other between the inner tile and the front tile. A regenerative burner characterized in that an air outlet is formed. The regenerative burner according to claim 1, wherein a slit is formed in the holding member so that the inside and the outside communicate with each other. The regenerative burner according to any one of claims 1 to 2, wherein the inner tile is made of a refractory material, and the front tile and the trunk tile are made of a refractory heat insulating material. The regenerative burner according to any one of claims 1 to 3, wherein an angle between the tapered surface of the inner tile and the axial direction of the inner tile is 10 to 20 °.

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