JP6727729B2 - Heat treatment furnace - Google Patents

Description

The present invention heats combustion air by the heat stored in the heat storage material accommodated in the heat storage section, guides the combustion air heated through the guide path from the air supply/exhaust port into the furnace, and is supplied from the fuel supply nozzle. While performing a combustion operation in which the fuel and the heated combustion air are burned in the furnace, the combustion exhaust gas after combustion in the furnace is guided to the heat storage section in which the heat storage material is housed, and the heat of the combustion exhaust gas is transferred. The present invention relates to a heat treatment furnace in which a combustion operation and a heat storage operation are alternately switched by using a heat storage type combustion burner configured to perform a heat storage operation for storing heat in a heat storage material. In particular, in a heat treatment furnace in which a heat storage type combustion burner is provided in each of the furnace ceiling and the body, a ceiling side heat storage type combustion burner provided in the furnace ceiling and a body provided in the furnace body When switching the combustion operation and the heat storage operation alternately with the side heat storage type combustion burner to heat the inside of the furnace to heat-treat the object to be treated, the flame from the ceiling side heat storage type combustion burner and the heat storage on the body side While suppressing the flame from the combustion burner coming into contact with the object to be treated, causing damage to the object, and increasing the temperature of the flame during combustion and increasing the amount of NOx produced The feature is that the inside of the furnace is efficiently heated so that the object to be processed can be sufficiently heat-treated.

BACKGROUND ART Conventionally, in a heat treatment furnace such as a heating furnace, when heat-treating an object to be treated in the furnace, the combustion burned in the furnace is used to perform efficient combustion by utilizing the heat of combustion exhaust gas in the furnace. After the heat of the exhaust gas is stored in the heat storage material stored in the heat storage portion, the combustion air is guided to this heat storage portion, and this combustion air is heated by the heat stored in the heat storage material in the heat storage portion, A regenerative combustion burner is widely used in which heated combustion air and fuel supplied from a fuel supply nozzle are mixed to burn the fuel in a furnace.

However, in the case of the regenerative combustion burner as described above, since the heated combustion air and the fuel are mixed and burned, the flame temperature at the time of combustion becomes high and the amount of NOx generated increases. There was a problem. Further, in the case of the conventional regenerative combustion burner, generally, the spread of the flame is small and the flame is long, and the flame contacts the object to be processed in the furnace, which may cause damage to the object to be processed, On the other hand, when the furnace is enlarged to prevent the flame from coming into contact with the object to be processed, there is a problem that various costs such as equipment cost and running cost are high in order to sufficiently heat the inside of the furnace. It was

Further, conventionally, in order to shorten the flame at the time of combustion in the heat storage type combustion burner as described above, as shown in Patent Document 1, a porous material having air permeability is installed at the tip of the fuel supply nozzle. The combustion air heated by the heat storage material in the heat storage portion is formed into the flame hole portion at the tip of the fuel supply nozzle, and the combustion air heated by the heat storage material in the heat storage portion is provided with the porous material as described above. Japanese Patent Application Laid-Open No. 2004-242242 proposes a method in which a fuel jetted from a fuel jetting unit is mixed with the fuel to burn it, and the length of the flame at the time of burning is shortened.

However, as described in Patent Document 1, in the flame hole portion in which the porous material is installed, in order to mix the fuel ejected from the fuel ejection portion and the heated combustion air for combustion, Since air is blown out through the flame hole portion in which the above-mentioned porous material is installed, a large blower or the like is required, which causes a problem of high equipment cost and running cost.

Further, in the related art, as shown in Patent Document 2, a plurality of regenerative combustion burners are provided along the circumferential direction of the body of the heat treatment furnace, and the adjacent regenerative combustion burners perform combustion operation and heat storage operation. It has been proposed to alternately switch between.

However, when combustion is performed by the heat storage type combustion burners provided along the circumferential direction in the body of the heat treatment furnace as described above, it becomes difficult to sufficiently heat the central portion of the furnace, and the circumferential direction is also increased. In the adjacent heat storage type combustion burners provided along with, when the combustion operation and the heat storage operation are alternately switched, during the combustion operation and the heat storage operation, the direction of burning the fuel ejected from the air supply and exhaust port and , The direction in which the combustion exhaust gas in the furnace is sucked through the air supply/exhaust port is opposite, making it difficult to obtain a smooth swirling flow, and the gas is ejected from the air supply/exhaust port of the regenerative combustion burner that is performing combustion. There is a problem that the heat of the generated flame is immediately sucked through the air supply/exhaust port of the heat storage type combustion burner provided next to the heat storage operation, which makes it difficult to sufficiently heat the inside of the furnace.

Further, as disclosed in Patent Document 3, a cylindrical cylindrical portion is provided in a portion of the heat storage portion for supplying combustion air heated by a heat storage material into the furnace, and the heating is performed in the cylindrical portion. The combustion air is swirled, and the fuel gas is supplied to the cylindrical portion from the gas nozzle, and the combustion air that is heated and swirled as described above is mixed with the fuel gas for combustion, and is provided on the furnace wall. It has been proposed to introduce the flame into the furnace through the expanded diameter portion and gradually increase the diameter of the flame to be burned to shorten the length of the flame during combustion and reduce the amount of NOx produced.

However, as shown in Patent Document 3, the heated combustion air is swirled in the cylindrical portion that supplies the combustion air into the furnace, and the fuel gas is supplied to the cylindrical portion from the gas nozzle. Even when the heated combustion air that is swirled and the fuel gas are mixed and burned, and the diameter of the flame that is burned through the expanded portion provided on the furnace wall is gradually increased, the entire furnace inside the heat treatment furnace is It is necessary to increase the supply amount of fuel and combustion air in order to sufficiently heat the material to be processed. When the amount of fuel or combustion air supplied is increased in this way, the temperature of the flame during combustion becomes high, and the amount of NOx produced cannot be reduced sufficiently. It becomes difficult to expand the diameter of the flame sufficiently along the section to shorten the length of the flame during combustion, and the flame contacts the workpiece in the furnace, causing damage to the workpiece. There was a problem that.

JP, 2000-199611, A JP-A-7-71879 JP, 2013-2706, A

The present invention heats combustion air by the heat stored in the heat storage material accommodated in the heat storage section, guides the combustion air heated through the guide path from the air supply/exhaust port into the furnace, and is supplied from the fuel supply nozzle. While performing a combustion operation in which the fuel and the heated combustion air are burned in the furnace, the combustion exhaust gas after combustion in the furnace is guided to the heat storage section in which the heat storage material is housed, and the heat of the combustion exhaust gas is transferred. To solve the above-mentioned various problems in the heat treatment furnace configured to alternately switch the combustion operation and the heat storage operation by using the heat storage type combustion burner configured to perform the heat storage operation for storing heat in the heat storage material. This is an issue.

Then, in the heat treatment furnace in the present invention, a regenerative combustion burner is provided in each of the ceiling portion and the body portion of the furnace, and the ceiling side regenerative combustion burner provided in the ceiling portion of the furnace and the body portion of the furnace are provided. In the body side heat storage type combustion burner, the combustion operation and the heat storage operation are alternately switched to heat the inside of the furnace to heat the object to be treated in the furnace. The flame from the body side heat storage type combustion burner may come into contact with the object to be treated, resulting in damage to the object to be treated, or the temperature of the flame at the time of combustion becomes high and the amount of NOx generated increases. It is an object of the present invention to efficiently heat the inside of the furnace while suppressing the above so that the object to be processed can be sufficiently heat-treated.

In the heat treatment furnace according to the present invention, in order to solve the above problems, the combustion air is heated by the heat stored in the heat storage material accommodated in the heat storage section, and the combustion air heated through the guide path is heated. A combustion operation is performed in which the fuel supplied from the fuel supply nozzle and the heated combustion air are burnt in the furnace from the air supply/exhaust port, while the combustion exhaust gas after combustion in the furnace is used as a heat storage material. In a heat treatment furnace using a heat storage type combustion burner that is configured to perform a heat storage operation in which the heat of the combustion exhaust gas is stored in a heat storage material by introducing the heat storage type combustion burner to the heat storage part in which the heat storage part is accommodated. And the body part, respectively, the ceiling side heat storage type combustion burner provided on the ceiling part of the furnace, and the body side heat storage type combustion burner provided on the body part of the furnace, the combustion operation and heat storage operation described above. By alternately switching, during the combustion operation of the ceiling side heat storage type combustion burner, while the heated combustion air is swirling along the inner circumference of the cylindrical ceiling side guide path. While being supplied from the ceiling side air supply/exhaust port into the furnace to burn the fuel while swirling in the furnace, during the combustion operation of the body side heat storage type combustion burner, the heated combustion air, The fuel was supplied from the body side air supply/exhaust port along the inner circumference of the body in the furnace through the body side guide path, and the fuel was burned while swirling along the inner circumference of the body.

Here, as in the heat treatment furnace according to the present invention, the combustion operation and the heat storage operation are performed by the ceiling side regenerative combustion burner provided in the ceiling of the furnace and the body side regenerative combustion burner provided in the body of the furnace. By alternately switching and, during the combustion operation of the ceiling side heat storage type combustion burner, the heated combustion air is swirled along the inner circumference of the cylindrical guide path on the ceiling side. While being supplied to the furnace from the ceiling side air supply/exhaust port, the fuel is mixed with the heated combustion air while being swirled in the furnace and burned. As it is heated in a wide range, the length of the flame in the ceiling side heat storage type combustion burner becomes shorter. Then, since the central part of the swirling vortex has a negative pressure, the combustion exhaust gas is burned while being burned, the flame temperature is lowered, and the amount of NOx generated can be reduced. Further, during the combustion operation of the body side heat storage type combustion burner, heated combustion air is supplied from the body side supply/exhaust port through the body side guide path along the inner circumference of the body in the furnace. At the same time, fuel is supplied to this and is burned while being swirled along the inner circumference of the body, so that the peripheral portion in the furnace is heated.

When the ceiling side heat storage type combustion burner provided in the ceiling portion of the furnace and the body side heat storage type combustion burner provided in the body portion of the furnace are alternately switched between the combustion operation and the heat storage operation. By the combustion operation of the ceiling side heat storage type combustion burner and the body side heat storage type combustion burner, it is possible to sufficiently heat the entire furnace and to reduce the amount of NOx generated.

Here, in the heat treatment furnace according to the present invention, it is preferable to provide a plurality of body side heat storage type combustion burners in the body of the furnace. With this configuration, during the combustion operation of the body side heat storage type combustion burner, the heated combustion air is supplied from each body side heat supply/exhaust port of each body side heat storage type combustion burner to the body part of the furnace. The fuel is supplied along the inner circumference, and the fuel is burned while appropriately swirling along the inner circumference of the body from each body side air supply/exhaust port, and the entire peripheral area inside the furnace is efficiently Be heated.

Further, in the heat treatment furnace according to the present invention, the swirling direction in which the fuel is swirled in the furnace during the combustion operation of the ceiling side heat storage type combustion burner and the combustion operation of the body side heat storage type combustion burner. At times, it is preferable to reverse the swirling direction in which the fuel is burned while swirling along the inner circumference of the body portion. By doing so, the direction of rotation of the flame is switched between the combustion operation of the ceiling side heat storage type combustion burner and the combustion operation of the body side heat storage type combustion burner, stirring the entire inside of the furnace and heating more uniformly. Will be done.

Further, in the heat treatment furnace according to the present invention, the combustion amount during the combustion operation of the ceiling side heat storage type combustion burner and the combustion amount during the combustion operation of all the body side heat storage type combustion burners are the same. Preferably. By doing so, it is possible to prevent unevenness in the amount of heat generated during each combustion due to the difference in the amount of combustion between the ceiling side heat storage type combustion burner and the body side heat storage type combustion burner, and the entire furnace interior. Can be uniformly heated, and the operation of alternately switching the combustion operation and the heat storage operation can be stably performed.

In the heat treatment furnace according to the present invention, the combustion operation and the heat storage operation are alternately switched between the ceiling side regenerative combustion burner provided in the ceiling of the furnace and the body side regenerative combustion burner provided in the body of the furnace. At the time of combustion operation of the ceiling side regenerative combustion burner, the heated combustion air is swirled along the inner circumference of the cylindrical guide path on the ceiling side, and is heated from the ceiling side supply/exhaust port to the furnace. Is supplied to the inside of the furnace, the fuel is burned while being swirled in the furnace from the ceiling side air supply/exhaust port, the central part of the furnace is heated widely, and at the time of combustion operation of the body side heat storage combustion burner. The heated combustion air is supplied from the body side supply/exhaust port through the body side guide path along the inner periphery of the body in the furnace, and the fuel is swirled along the inner periphery of the body. While being burned, the periphery of the furnace is heated.

As a result, in the heat treatment furnace in the present invention, the combustion operation and the heat storage operation are performed by the ceiling side regenerative combustion burner provided in the ceiling of the furnace and the body side regenerative combustion burner provided in the body of the furnace. By performing the switching alternately, the entire furnace can be sufficiently heated to heat the object to be processed without the flame coming into contact with the object to be processed, and the amount of NOx generated can be reduced. Like

In a heat treatment furnace according to an embodiment of the present invention, a state is shown in which a ceiling side regenerative combustion burner provided in the ceiling of the furnace is provided and two body side regenerative combustion burners are provided in the body of the furnace. , (A) is a schematic plan view, and (B) is a schematic side view. In the heat treatment furnace according to the above-mentioned embodiment, while the combustion operation is performed in the ceiling side heat storage type combustion burner, the heat storage operation is performed in the body side heat storage type combustion burner, (A) is a schematic plan view FIG. 1B is a schematic side view. In the heat treatment furnace according to the above-described embodiment, while the combustion operation is performed in the body side heat storage type combustion burner, while the heat storage operation is performed in the ceiling side heat storage type combustion burner, (A) shows each body FIG. 3B is a cross-sectional explanatory view of the body side air supply/exhaust port portion showing a combustion state by the part side heat storage type combustion burner, and FIG. In the heat treatment furnace according to the embodiment, it is a schematic side view showing a first modified example in which the ceiling side air supply/exhaust port of the ceiling side heat storage type combustion burner is formed so as to widen toward the inside of the furnace. .. In the heat treatment furnace according to the embodiment, the ceiling side supply nozzles for supplying fuel to the ceiling side regenerative combustion burner are provided on both sides of the ceiling side air supply/exhaust port in addition to the ceiling side guide passage. It is a schematic plan view which showed the example of 2 changes. FIG. 9 is a schematic plan view showing a third modified example in which one body side heat storage combustion burner is provided in the body of the furnace in the heat treatment furnace according to the embodiment. In the heat treatment furnace according to the above-mentioned embodiment, it is a schematic plan view showing a fourth modified example in which the furnace ceiling portion is quadrangular and the body portion is quadrangular tubular.

A heat treatment furnace according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. The heat treatment furnace according to the present invention is not limited to the one shown in the following embodiment, and can be appropriately modified and implemented without changing the gist of the invention.

Here, in the heat treatment furnace according to the first embodiment, as shown in FIGS. 1(A) and 1(B), etc., a ceiling side heat storage type is installed at the center of the circular ceiling part 11 in the furnace 10. While the combustion burner 20 is provided, two cylindrical body side heat storage type combustion burners 30, 30 are provided on the cylindrical body portion 12 of the furnace 10 so as to be located on opposite sides of the center portion of the furnace 10. ing.

Then, as shown in FIGS. 2A and 2B, when the ceiling side heat storage type combustion burner 20 performs a combustion operation, the two body side heat storage type combustion burners 30, 30 perform a heat storage operation. On the other hand, as shown in FIGS. 3A and 3B, when the combustion operation is performed in the two body side heat storage type combustion burners 30, 30, the ceiling side heat storage type combustion burner is performed. A heat storage operation is performed in the burner 20, and a combustion operation and a heat storage operation are alternately switched between the ceiling side heat storage type combustion burner 20 and the two body side heat storage type combustion burners 30, 30. I'm trying to do it.

Here, when performing the combustion operation in the ceiling side heat storage type combustion burner 20, as shown in FIGS. 2A and 2B, combustion air is supplied from the ceiling side air supply/exhaust pipe 21 to the heat storage material 22a. Is introduced into the ceiling side heat storage chamber 22 and the combustion air is heated by the heat stored in the heat storage material 22a, and the combustion air heated in this way is formed into a tubular shape from the guide portion 23a. It is guided to the ceiling side guide path 23, guided along the inner circumference of the ceiling side guide path 23 into the furnace 10 from the ceiling side air supply/exhaust port 24, and in this manner, The fuel is supplied from the ceiling-side fuel supply nozzle 25 to the heated combustion air introduced into the furnace 10 from the above. Then, the combustion air and the fuel which are heated while being swirled from the ceiling side air supply/exhaust port 24 are mixed with each other, and are burned in the furnace 10. As described above, when the combustion air heated from the ceiling-side air supply/exhaust port 24 and the fuel are mixed in the furnace 10 and burned while swirling, the central portion of the furnace 10 is heated in a wide range. And the length of the flame in the ceiling side heat storage type combustion burner 20 becomes shorter.

Further, when performing the heat storage operation in the two body side heat storage type combustion burners 30, 30 during the combustion operation of the ceiling side heat storage type combustion burner 20 shown in FIGS. 2(A) and 2(B) described above. As described above, the combustion exhaust gas in the furnace 10 is sucked from the body side supply/exhaust ports 31, 31 provided in the body side heat storage type combustion burners 30, 30 to the body side guide paths 32, 32. The combustion exhaust gas is introduced through the respective body part side guide paths 32, 32 while the body part side fuel supply nozzles 33, 33 connected to the body part side guide paths 32, 32 are closed. Is guided to each body part side heat storage chamber 34, 34, and after the heat of the combustion exhaust gas is stored in the heat storage materials 34a, 34a in each body part side heat storage chamber 34, 34, the combustion exhaust gas after the heat storage is stored in each body. The heat storage chambers 34, 34 are guided to the outside through the body air supply/exhaust pipes 35, 35, respectively.

Further, when performing the combustion operation in the two body side heat storage type combustion burners 30, 30, as shown in FIGS. 3(A) and 3(B), the respective body side supply/exhaust pipes 35, 35 are provided. The combustion air is guided to the body-side heat storage chambers 34 and 34 in which the heat storage materials 34a and 34a are housed, respectively, by the heat stored in the heat storage materials 34a and 34a in the body-side heat storage chambers 34 and 34, respectively. The combustion air is heated, and the combustion air heated in this way is guided to the body part side guide paths 32, 32, and is passed through the body part side guide paths 32, 32 from the body part side air supply/exhaust ports 31, 31. The fuel is supplied from the body-side fuel supply nozzles 33 and 33 to the heated combustion air that is guided into the furnace 10 from the body-side guide paths 32 and 32. I have to. Then, the heated combustion air and fuel are mixed and supplied from the respective body part side air supply/exhaust ports 31, 31 along the inner circumference of the body part 12, and each body part side air supply/exhaust port 31, Along the inner circumference of the body portion 12 from 31, the combustion is performed in the furnace 10 while swirling in the opposite direction to the case of the above-mentioned ceiling side heat storage type combustion burner 20.

By doing so, the flame swirling direction is switched between the combustion operation of the ceiling side heat storage type combustion burner 20 and the combustion operation of each body side heat storage type combustion burner 30, 30 and the entire furnace 10 is agitated. , More evenly heated.

Further, when performing the heat storage operation in the ceiling side heat storage type combustion burner 20 during the combustion operation of each of the body side heat storage type combustion burners 30 and 30, as shown in FIG. The combustion exhaust gas in the furnace 10 is sucked from the ceiling side supply/exhaust port 24 of the ceiling side heat storage type combustion burner 20 and guided to the ceiling side guide path 23, and is connected to the ceiling side guide path 23. In the state where the ceiling side fuel supply nozzle 25 is closed, the combustion exhaust gas is guided to the ceiling side heat storage chamber 22 in which the heat storage material 22a is accommodated through the ceiling side guide path 23, and the heat storage material in the ceiling side heat storage chamber 22 is After the heat of the combustion exhaust gas is stored in 22a, the combustion exhaust gas after the heat storage is guided to the outside from the ceiling side heat storage chamber 22 through the ceiling side supply/exhaust pipe 21.

Here, as described above, the combustion operation is performed by the ceiling side heat storage type combustion burner 20 provided in the ceiling portion 11 of the furnace 10 and the respective body side heat storage type combustion burners 30, 30 provided in the body portion 12 of the furnace 10. By alternately switching between the heat storage operation and the heat storage operation, at the time of the combustion operation of the ceiling side heat storage type combustion burner 20, the inner circumference of the ceiling side guide path 23 in which the heated combustion air has a tubular shape. The fuel is supplied from the ceiling-side air supply/exhaust port 24 into the furnace 10 while being swirled along, and fuel is burned while being swirled in the furnace 10 from the ceiling-side air supply/exhaust port 24. The central portion of the heat source is heated in a wide range, and the length of the flame in the ceiling side regenerative combustion burner 20 is shortened, so that the flame comes into contact with an object to be treated (not shown) or the like, It is possible to prevent the processed material from being damaged, and to prevent the amount of NOx generated from increasing due to the temperature of the flame during combustion increasing.

Further, during the combustion operation of the body side heat storage type combustion burners 30, 30, heated combustion air is passed through the body side guide paths 32, 32 from the body side air supply/exhaust ports 31, 31 respectively. As it goes along the inner circumference of the body 12, it is burned in the furnace 10 while being swirled in the opposite direction to the case of the above-mentioned ceiling side heat storage type combustion burner 20, and the flame does not come into contact with the object to be treated. Thus, the inner peripheral portion of the furnace 10 is heated.

As a result, the entire interior of the furnace 10 can be sufficiently heated by the combustion operation of the ceiling side heat storage type combustion burner 20 and the body side heat storage type combustion burners 30, 30.

Further, as described above, when the combustion operation and the heat storage operation are alternately switched between the ceiling side heat storage type combustion burner 20 and the body side heat storage type combustion burners 30, 30, the ceiling side heat storage type combustion burner is used. The combustion amount of the burner 20 during the combustion operation is made equal to the combustion amount of each of the body side heat storage type combustion burners 30, 30 during the combustion operation. With this configuration, when the combustion operation and the heat storage operation are alternately switched between the ceiling side heat storage type combustion burner 20 and the body side heat storage type combustion burners 30, 30, the amount of heat generated during each combustion It is possible to prevent unevenness in the temperature distribution, etc., to uniformly heat the entire inside of the furnace 10, and to stably perform the operation of alternately switching the combustion operation and the heat storage operation.

Here, in the heat treatment furnace in the above-described embodiment, the ceiling side air supply/exhaust port 24 of the ceiling side heat storage type combustion burner 20 has the same diameter as that of the ceiling side guide path 23. As shown in FIG. 5, the ceiling side air supply/exhaust port 24 may be formed in an R shape so as to spread toward the inside of the furnace 10. With this configuration, the combustion air is swirled along the inner circumference of the ceiling-side guide path 23 while being spread toward the inside of the furnace 10 when being supplied from the ceiling-side air supply/exhaust port 24 into the furnace 10. In the state where the combustion air is further spread from the ceiling side air supply/exhaust port 24 formed as described above, the combustion air is swirled and supplied into the furnace 10 to be mixed with the fuel. You will be able to shorten the length of.

Further, in the heat treatment furnace in the above-described embodiment, in the ceiling-side regenerative combustion burner 20, the ceiling-side fuel supply nozzle 25 is connected to the ceiling-side guide path 23 in the vicinity of the ceiling-side air supply/exhaust port 24. However, as shown in FIG. 5, in addition to the ceiling side fuel supply nozzle 25, the ceiling side 11 near both the ceiling side air supply/exhaust port 24 is connected to the ceiling 11 respectively. It is also possible to provide the second ceiling side fuel supply nozzles 25a, 25a.

Then, in such a case, the fuel is not supplied from the ceiling side fuel supply nozzle 25, and each of the second sections provided on the ceiling section 11 on both sides near the ceiling side air supply/exhaust port 24 is provided. When the fuel is supplied from the ceiling side fuel supply nozzles 25a, 25a to the combustion air guided into the furnace 10 while swirling through the ceiling side supply/exhaust port 24, the combustion exhaust gas in the furnace 10 is generated. As described above, while being swirled, the negative pressure generated in the central portion of the swirling flow of the combustion air introduced into the furnace 10 is taken in to perform combustion, and the amount of NOx generated during combustion is reduced, and The fuel supplied from the respective second ceiling side fuel supply nozzles 25a, 25a into the furnace 10 is in a wide range with the combustion air supplied into the furnace 10 while being swirled from the ceiling side supply/exhaust port 24. When mixed and burned, the flame upon combustion spreads further and the length of the flame becomes shorter.

Further, in the heat treatment furnace in the above-described embodiment, the two barrel side heat storage combustion burners 30, 30 are provided in the cylindrical barrel portion 12 of the furnace 10 on the opposite side via the center portion of the furnace 10. Although the number of the body side heat storage type combustion burners 30 provided in the body portion 12 is not particularly limited and is provided so as to be positioned, a larger number of body side heat storage type combustion burners 30 are provided. You can also do so. Further, as shown in FIG. 6, it is possible to provide one barrel-side heat storage combustion burner 30 on the barrel 12 of the furnace 10 which has a cylindrical shape. Even in this case, the combustion amount of the ceiling side heat storage type combustion burner 20 during the combustion operation and the combustion amount of the body side heat storage type combustion burner 30 during the combustion operation should be the same. Therefore, it is possible to prevent uneven generation of heat in each combustion, to uniformly heat the entire furnace 10, and to stably switch the combustion operation and the heat storage operation alternately. To be able to do it.

Further, in the heat treatment furnace in the above-described embodiment, as the furnace 10, the one in which the ceiling portion 11 has a circular shape and the body portion 12 has a cylindrical shape is used, but the shape of the furnace 10 is as follows. For example, as shown in FIG. 7, it is possible to use a ceiling part 11 having a quadrangular shape and a body part 12 having a quadrangular tubular shape, and further, a quadrangular shape or more. It may be polygonal.

10: Furnace 11: Ceiling 12: Body 20: Ceiling side regenerative combustion burner 21: Ceiling side air supply/exhaust pipe 22: Ceiling side heat storage chamber 22a: Heat storage material 23: Ceiling side guide path 23a: Guide part 24: Ceiling side air supply/exhaust port 25: Ceiling side fuel supply nozzle 25a: Second ceiling side fuel supply nozzle 30: Body side heat storage combustion burner 31: Body side air supply/exhaust port 32: Body side guide Path 33: Body part side fuel supply nozzle 34: Body part side heat storage chamber 34a: Heat storage material 35: Body part side supply/exhaust pipe

Claims (4)

The combustion air is heated by the heat stored in the heat storage material accommodated in the heat storage unit, the heated combustion air is guided through the guide path into the furnace from the air supply/exhaust port, and the fuel supplied from the fuel supply nozzle and the aforesaid While performing combustion operation to burn the heated combustion air of the inside of the furnace, it guides the combustion exhaust gas after combustion in the furnace to the heat storage part containing the heat storage material, and stores the heat of the combustion exhaust gas in the heat storage material. In a heat treatment furnace using a regenerative combustion burner configured to perform a regenerative operation, the above regenerative combustion burners are provided in the furnace ceiling and the body, respectively. Type combustion burner and a body side heat storage type combustion burner provided in the body of the furnace, the combustion operation and the heat storage operation are alternately switched, and the ceiling side heat storage type combustion burner is burned. During operation, while the heated combustion air is swirling along the inner circumference of the cylindrical guide path on the ceiling side, it is supplied from the ceiling side air supply/exhaust port into the furnace to supply the fuel in the furnace. While burning while swirling, at the time of the combustion operation of the body side heat storage type combustion burner, the heated combustion air is fed through the body side guide path from the body side supply/exhaust port to the body part of the furnace. A heat treatment furnace, characterized in that the fuel is supplied along the inner circumference and the fuel is burned while swirling along the inner circumference of the body. The heat treatment furnace according to claim 1, wherein a plurality of body side heat storage type combustion burners are provided in a body portion of the furnace. The heat treatment furnace according to claim 1 or 2, wherein a swirl direction in which fuel is burned while swirling in the furnace during the combustion operation of the ceiling side regenerative combustion burner, and the body side regenerative combustion burner. The heat treatment furnace is characterized in that the swirling direction in which the fuel is burned while swirling along the inner circumference of the body during the burning operation is opposite to the swirling direction. The heat treatment furnace according to any one of claims 1 to 3, wherein a combustion amount of the ceiling side heat storage type combustion burner during a combustion operation and a total combustion operation of the body side heat storage type combustion burner. A heat treatment furnace, which has the same amount of combustion as time.

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