JP2004301369A - Combustion apparatus for heating furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion apparatus for a heating furnace, of which maintenance work can be simplified while allowing heating inside the furnace in the condition of uniforming temperature distribution. <P>SOLUTION: The combustion apparatus is constituted by being provided with an oxygen containing gas supply part for supplying combustion oxygen containing gas flowing with the existence of its horizontal width from a lateral side portion of the heating furnace to the upper side of a heated object in the furnace and a gas fuel jet nozzle 11 for jetting gas fuel from the lower side of an oxygen containing gas supply portion of the oxygen containing gas supply part at a lateral side portion of the heating furnace to an in-furnace combustion region S to which the oxygen containing gas is supplied flowing with the existence of its horizontal width. Herein, as the gas fuel jet nozzle 11, one gas fuel jet nozzle 11 is provided in an integrated condition for jetting the gas fuel from a plurality of jetting portions N radially in a plan view so that sector flames are formed to spread over all or almost all of the horizontal width of the in-furnace combustion region S to which the oxygen containing gas is supplied flowing with the existence of its horizontal width. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is directed to an oxygen-containing gas supply unit that supplies an oxygen-containing gas for combustion in a fluid state having a width from the side of the heating furnace toward the upper side of the object to be heated in the furnace,
From the lower part of the oxygen-containing gas supply part of the oxygen-containing gas supply part on the lateral side of the heating furnace, gaseous fuel is ejected toward the in-furnace combustion zone where the oxygen-containing gas is supplied in a flow state having the lateral width. The present invention relates to a combustion device for a heating furnace provided with a gas fuel ejection nozzle.
[0002]
[Prior art]
Such a combustion device for a heating furnace (hereinafter, may be simply referred to as a combustion device) has a flow having a lateral width from the lateral side of the heating furnace to an upper side of a heating target in the furnace by an oxygen-containing gas supply unit. The oxygen-containing gas is supplied in a state, and the oxygen-containing gas is supplied by the gas fuel jet nozzle from below the oxygen-containing gas supply point of the oxygen-containing gas supply unit on the side of the heating furnace in a flow state having the lateral width. Gas fuel toward the in-furnace combustion zone (hereinafter, sometimes simply referred to as the in-furnace combustion zone), bringing the gas fuel into contact with the oxygen-containing gas for combustion in the furnace, and It burns so as to form a flame upward.
In such a combustion device, it is desired to heat the furnace in a state where the temperature distribution is made uniform, and in such a case where the temperature distribution in the furnace is made uniform, the gas fuel ejection nozzle is It is necessary to discharge the gaseous fuel so as to form a flame over the entire width or substantially the entire width of the in-furnace combustion zone.
[0003]
For this reason, conventionally, a plurality of gas fuel ejection nozzles for ejecting gas fuel so as to form a flame having a width smaller than the width of the in-furnace combustion zone are provided on the lateral side of the heating furnace as gas fuel ejection nozzles. The flame is formed over the entire width or substantially the entire width in the width direction of the in-furnace combustion zone. Incidentally, as described above, when providing a plurality of gas fuel ejection nozzles as gas fuel ejection nozzles in order to equalize the temperature distribution in the furnace, the width of the flame formed by one gas fuel ejection nozzle is: For example, when three gas fuel ejection nozzles are provided so as to be equal to or less than the width obtained by dividing the width of the in-furnace combustion zone by the number of installed gas fuel ejection nozzles, the width is less than 1/3 of the width of the in-furnace combustion zone. It was configured to have a narrow width.
[0004]
In some cases, a plurality of oxygen-containing gas supply units are provided side by side on the lateral side of the heating furnace. In such a case, in-furnace combustion zones corresponding to the plurality of oxygen-containing gas supply units are provided in front of each of the plurality of oxygen-containing gas supply units. And a plurality of gas fuel jets for jetting gas fuel so as to form a flame having a width narrower than the width of the in-furnace combustion zone as a gas fuel jet nozzle corresponding to each oxygen-containing gas supply section. Nozzles are provided side by side at intervals in the lateral direction of the heating furnace so as to form a flame over the entire width or substantially the entire width of the in-furnace combustion zone corresponding to each oxygen-containing gas supply unit. (For example, see Patent Document 1).
[0005]
[Patent Document 1]
See Japanese Patent Application Laid-Open No. 2001-201262
[Problems to be solved by the invention]
By the way, in such a combustion device, it is necessary to perform maintenance of the gas fuel ejection nozzle, and at the time of the maintenance, the gas fuel ejection nozzle is removed from the side portion of the heating furnace to perform inspection and maintenance. It will be attached to the side.
However, in the conventional combustion device, as described above, a plurality of gas fuel ejection nozzles are provided for one oxygen-containing gas supply unit as the gas fuel ejection nozzles, and thus each of the plurality of gas fuel ejection nozzles is provided. Requires maintenance work, and the maintenance work becomes complicated as a whole.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a combustion furnace for a heating furnace capable of simplifying maintenance work while heating the inside of the furnace in a state where the temperature distribution is uniform. It is to provide a device.
[0008]
[Means for Solving the Problems]
[Invention of claim 1]
The oxygen-containing gas supply for supplying the oxygen-containing gas for combustion in a fluid state with a width from the lateral side of the heating furnace toward the upper side of the object to be heated in the furnace, the combustion device for a heating furnace according to claim 1. Department and
From the lower part of the oxygen-containing gas supply part of the oxygen-containing gas supply part on the lateral side of the heating furnace, gaseous fuel is ejected toward the in-furnace combustion zone where the oxygen-containing gas is supplied in a flow state having the lateral width. A gas fuel jet nozzle is provided,
As the gas fuel ejection nozzle, so as to form a fan-shaped flame that spreads over the entire width or substantially the entire width in the width direction of the in-furnace combustion zone in which the oxygen-containing gas is supplied in a flow state with the horizontal width, A characteristic feature is that one gas fuel ejection nozzle is integrally provided so as to eject gas fuel radially in a plurality of ejection portions in plan view.
That is, at a plurality of ejection portions of one gas fuel ejection nozzle, the gas fuel is ejected radially in a plan view, and spreads over the entire width or substantially the entire width of the in-furnace combustion area in a fan shape. The formation of the flame makes it possible to make the temperature distribution in the furnace uniform.
In addition, since one gas fuel ejection nozzle is provided for one oxygen-containing gas supply unit as the gas fuel ejection nozzle, the gas fuel ejection nozzle that performs maintenance when the gas fuel ejection nozzle is maintained Is reduced, and the maintenance work can be simplified.
By the way, in the case where a plurality of oxygen-containing gas supply units are provided side by side on the heating furnace side portion, in front of each of the plurality of oxygen-containing gas supply units, there is a corresponding in-furnace combustion zone. As described above, as the gas fuel ejection nozzle corresponding to each oxygen-containing gas supply unit, a plurality of fan-shaped flames are formed so as to form a fan-shaped flame that extends over the entire width or substantially the entire width in the in-furnace combustion zone, as described above. A single gas fuel ejection nozzle is integrally provided so as to eject gas fuel radially at the ejection portion in plan view.
Therefore, it is possible to provide a combustion apparatus for a heating furnace that can simplify the maintenance work while heating the inside of the furnace in a state where the temperature distribution is made uniform.
[0009]
[Invention of claim 2]
According to a second aspect of the present invention, in the combustion apparatus for a heating furnace according to the first aspect, the gas fuel ejection nozzle is formed such that a plurality of ejection holes as the plurality of fuel ejection portions are radially formed in a nozzle forming body in a plan view. The feature of the present invention is that it is formed in the following manner.
In other words, the gas fuel is radially ejected in plan view by the plurality of ejection holes formed in the nozzle forming body so as to be radial in plan view, and extends over the entire width or substantially the entire width of the in-furnace combustion area in the lateral width direction. A fan-shaped flame spreading like this is formed.
In other words, the gas fuel ejection nozzle can be configured with a simple configuration in which a plurality of ejection holes are formed in the nozzle forming body so as to be radial in a plan view, so that the cost of the combustion device can be reduced. Become.
By the way, it is conceivable to configure the gas fuel ejection nozzle in a configuration in which a plurality of tubular bodies as a plurality of ejection portions are integrally arranged in a state of being arranged radially in a plan view, but in this case, Since the configuration of the gas fuel ejection nozzle is complicated, the cost of the combustion device rises.
Accordingly, it has become possible to reduce the cost of the combustion device for the heating furnace.
[0010]
[Invention of claim 3]
A combustion apparatus for a heating furnace according to a third aspect is characterized in that, in the second aspect, the ejection hole is formed so that the length of the hole is at least twice the diameter of the hole. .
That is, the gas fuel is jetted with good straightness by each jet hole formed so that the length of the hole becomes twice or more the diameter of the hole, so that the entire width or almost the entire width of the in-furnace combustion zone is obtained. A fan-shaped flame that spreads over is formed in a stable shape.
That is, even if the ejection hole is formed, the straightness of gas fuel ejection from the ejection hole decreases as the ratio of the length of the hole to the diameter of the hole decreases. If the ejection holes are formed so that the ratio becomes 2 or more, it is possible to eject the gas fuel in a state where the straightness is effectively given, thereby stabilizing the shape of the flame. It becomes possible to do.
Further, since the fan-shaped flame which spreads over the entire width or substantially the entire width in the in-furnace combustion area is formed in a stable shape, the temperature distribution in the furnace can be made more uniform.
Therefore, it is possible to provide a preferred specific configuration for making the temperature distribution in the furnace even more uniform.
[0011]
[Invention of claim 4]
The combustion apparatus for a heating furnace according to claim 4 is the combustion apparatus according to any one of claims 1 to 3, wherein the plurality of ejection sections pass through a location where the gas fuel ejection nozzle is installed in plan view and include the oxygen-containing gas. It is characterized in that gas fuel is ejected to both sides of an imaginary line along the supply direction of the oxygen-containing gas for combustion from the gas supply unit.
That is, by a plurality of ejection parts, in plan view, the gas fuel passes through the installation location of the gas fuel ejection nozzle and on both sides of an imaginary line along the supply direction of the oxygen-containing gas for combustion from the oxygen-containing gas supply part. So that, in plan view, the fan-shaped flame spreads on both sides of an imaginary line passing through the installation location of the gas fuel ejection nozzle and along the supply direction of the oxygen-containing gas for combustion from the oxygen-containing gas supply unit. Is formed.
Then, in plan view, a fan-shaped flame is formed which extends through both sides of an imaginary line passing through the installation location of the gas fuel ejection nozzle and along the supply direction of the oxygen-containing gas for combustion from the oxygen-containing gas supply unit. Since it is possible to uniformly cover the upper part of the object to be heated with the flame over a wide range as much as possible in the lateral width direction, the temperature distribution in the furnace can be made more uniform.
Therefore, it is possible to provide a preferred specific configuration for making the temperature distribution in the furnace even more uniform.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a combustion apparatus for a glass melting furnace as a heating furnace will be described with reference to the drawings.
First, a glass melting furnace provided with a combustion device will be described.
As shown in FIGS. 1 and 2, the glass melting furnace includes a melting tank 2 having a rectangular shape in a plan view at a lower portion in a furnace body 1, and a furnace wall for installing a combustion device on one side of the melting tank 2. 4, a combustion device is provided so as to blow gas fuel G into the furnace 3 and form a flame F above the melting tank 2 in a state facing the furnace wall 4 facing the furnace wall 4 for installing the combustion device. It is configured in.
[0013]
At the end on the combustion device installation side of the furnace wall 4 connected to the lateral end of the furnace wall 4 for installing the combustion device, a glass material is supplied in a direction substantially orthogonal to the direction of gas fuel ejection from the combustion device. An opening 4i is provided, a work tank 9 is provided outside the furnace wall 4 facing the furnace wall 4 for installing the combustion device, and a melting tank 2 is provided on the furnace wall 4 between the work tank 9 and the melting tank 2. An opening 4e for communication between the melting tank 2 and the work tank 9 is formed at the hearth of the melting tank 2 to form a so-called end port.
That is, the glass raw material in the melting tank 2 is melted by the flame F formed by the combustion device, the glass raw material is charged into the melting tank 2 through the inlet 4i, and the glass raw material is directed toward the opening 4e. It is configured to melt while flowing in a meandering manner, and to lead clean molten glass to the work tank 9 through the opening 4e of the hearth.
[0014]
The combustion device will be described in more detail. The combustion device includes a pair of combustion units provided side by side on the furnace wall 4 for installing the combustion device, and the pair of combustion units is operated for a predetermined time (for example, Every 15 to 30 minutes), so-called alternating combustion is performed.
Each of the pair of combustion units is provided with a combustion air A as a combustion oxygen-containing gas through an air port 5 formed in a furnace wall 4 for installing a combustion device, and a width of the combustion air A obliquely downward toward the upper part of the melting tank 2 in the furnace 3. In-furnace combustion in which combustion air A is supplied in a flow state with a certain width from below one air supply path 6 as an oxygen-containing gas supply section to be supplied in a certain flow state and the air port 5. A gas burner B for ejecting gaseous fuel G toward the region S, so-called underport type, and further, one gas burner communicating with the air supply passage 6 and having a heat storage material. It has a heat storage chamber 8 and is configured as a heat storage type. The furnace wall 4 for installing the combustion device corresponds to the side portion of the heating furnace, and the air port 5 corresponds to a supply point of the oxygen-containing gas for combustion in the air supply passage 6 in the side portion of the heating furnace. I do.
[0015]
That is, the in-furnace combustion zones S corresponding to the respective air inlets 5 of the pair of air supply passages 6 are provided in front of the respective air inlets 5, and the width of each in-furnace combustion zone S (combustion air from the air outlet 5). The horizontal width along the supply direction when viewed in the combustion air supply direction) is approximately の of the horizontal width of the furnace interior 3 when viewed in the combustion air supply direction.
One gas burner B is provided for each of the pair of air supply passages 6, that is, for each in-furnace combustion zone S.
[0016]
The gas burners B of the pair of combustion units alternately switch between an ejection state in which the gas fuel G is ejected to the in-furnace combustion zone S and an ejection stop state in which the gas fuel G is stopped being ejected at regular intervals. The air supply passages 6 of the pair of combustion sections pass through the heat storage chamber 8 through the air supply passages 6 of the combustion section toward the gas burner B in the jetting state and have a high temperature (1000 to 1000). An air supply path in which combustion air A preheated to about 1200 ° C. is supplied from the air port 5 to the in-furnace combustion zone S, and an air supply passage of a combustion section of the gas burner B in the injection stopped state. Through the air passage 6, the combustion gas E in the furnace 3 is discharged from the air port 5, and the exhaust gas E is switched to an exhaust state in which the exhaust heat of the combustion exhaust gas E is stored in the heat storage material.
Then, the gas burners B of the pair of combustion sections are alternately switched to the ejection state and the ejection stop state at regular intervals, and the air supply path 6 of the pair of combustion sections is switched between the supply state and the exhaust state. The state is switched to the state, and the pair of combustion sections are alternately burned as described above. FIGS. 1 and 2 show a state in which the right burning part is burning and the left burning part is extinguished.
[0017]
Hereinafter, the gas burner B will be described.
As shown in FIGS. 3 to 6, the gas burner B cools one gas fuel jet nozzle 11 for jetting gas fuel G into the in-furnace combustion zone S of the furnace 3. And a fuel supply unit 13 that supplies gas fuel G to the gas fuel ejection nozzle 11. The gas fuel jet nozzle 11 is configured to be detachable from the fuel supply unit 13 and a plurality of gas fuel jet nozzles 11 are prepared as described later, and one of the plurality of gas fuel jet nozzles 11 is selected. Then, it is configured to be attached to the fuel supply unit 13.
[0018]
That is, since one gas burner B is provided for each of the pair of air supply passages 6, the gas fuel ejection nozzle 11 corresponding to each of the pair of air supply passages 6 is configured as follows. A plurality of gas fuel ejection nozzles 11 are provided.
[0019]
The gas fuel ejection nozzle 11 will be described with reference to FIG. 7 in addition to FIGS. 3 to 6. 7A is a partially cutaway plan view of the gas fuel ejection nozzle 11, and FIG. 7B is a vertical side view of the gas fuel ejection nozzle 11.
The gas fuel ejection nozzle 11 forms a fan-shaped flame F that spreads over the entire width or substantially the entire width of the in-furnace combustion zone S in which the combustion air A is supplied in a flow state with the horizontal width. As described above, the gas fuel G is integrally formed so as to be radially ejected from the plurality of ejection portions N in plan view.
Specifically, the gas fuel ejection nozzle 11 has, in a plan view, a substantially semicircular portion 11b lacking both sides in the diametric direction, and a square cylinder connected to a portion corresponding to the diameter of the substantially semicircular portion 11b. The nozzle forming body having a shape similar to a semicircle provided with a fitting portion 11c having a shape of a circle has a plurality of jetting portions N such that an arc-shaped front surface 11d of the substantially semicircular portion 11b is a gas fuel jetting side. The three ejection holes 11a are formed radially in a plan view. The three orifices 11a are formed so as to be bilaterally symmetric with respect to the axis of the central orifice 11a at the center in the direction in which the orifices are arranged in plan view, so that the plurality of orifices N are formed. In a plan view, the gas fuel G is ejected so as to be symmetrical with respect to an imaginary line passing through the installation location of the gas fuel ejection nozzle 11 and along the supply direction of the combustion air A from the air supply passage 6. I have. That is, the plurality of ejection portions N are configured to eject the gas fuel to both sides of an imaginary line passing through the installation location of the gas fuel ejection nozzle 11 and along the supply direction of the combustion air from the air supply passage 6 in a plan view. It is configured in.
Each ejection hole 11a is formed such that the length of the hole is at least twice the diameter of the hole.
[0020]
The width in the diametrical direction of the substantially semicircular portion 11b of the fitting portion 11c is smaller than the diametrical width of the approximately semicircular portion 11b, and the axial center of the substantially semicircular portion 11b in the fitting portion 11c. The thickness in the direction is smaller than the thickness in the axial direction of the substantially semicircular portion 11b.
[0021]
The gas fuel jet nozzle 11 has three radial jets formed by making the angles formed by the axial centers of the jet holes 11a at both ends different from, for example, 40 °, 50 °, 60 °, etc. in plan view. A plurality of holes 11a having different radiation angles are prepared.
Then, from the plurality of gas fuel ejection nozzles 11 having different emission angles of the three ejection holes 11a, a fan-shaped flame F is appropriately formed so as to spread over the entire width or substantially the entire width of the in-furnace combustion zone S in the width direction. A possible one is selected and attached to the fuel supply unit 13.
[0022]
The fuel supply unit 13 is formed in a cylindrical box shape, and an opening 13w for fitting the fitting portion 11c of the gas fuel ejection nozzle 11 is formed at a tip end surface thereof. Then, the gas fuel ejection nozzle 11 is attached to the fuel supply unit 13 by being fitted into the fitting portion 11c of the gas fuel ejection nozzle 11 and screwing a screw (not shown) into the fitting portion 11c.
A gas fuel supply pipe (not shown) for supplying gas fuel A such as city gas is connected to the rear end of the fuel supply unit 13 to supply gas fuel G to the gas fuel ejection nozzle 11 through the fuel supply unit 13. Thus, the plurality of ejection holes 11a are ejected radially as described above.
[0023]
The cooling water jacket 12 is formed in a rectangular tube shape surrounding the side peripheral portion of the gas fuel jet nozzle 11, connects a cooling water supply pipe (not shown) to a cooling water supply port 12i, and has a cooling water discharge port 12e. Is connected to a cooling water discharge pipe (not shown) so as to allow the cooling water to flow therethrough.
The cooling water jacket 12 is fixedly attached to the tip of the fuel supply unit 13. By inserting and removing the gas fuel ejection nozzle 11 through the rectangular tubular cooling water jacket 12, the gas fuel ejection nozzle 11 is It is configured to be attached to the supply unit 13 or detached from the fuel supply unit 13.
[0024]
As shown in FIGS. 3 and 4, the gas burner B configured as described above is inserted into the burner insertion hole 4 b of the furnace wall 4 from the tip side of the gas fuel jet nozzle 11, and is disposed around the gas burner B. The gap between the insertion hole 4b and the insertion hole 4b is sealed with a sealing material 10 to block air from entering the inside of the furnace 3 from outside through the outer peripheral portion of the gas burner B.
[0025]
By configuring the gas fuel ejection nozzle 11 as described above, as shown in FIGS. 2 and 4, the gas fuel G is ejected in a symmetrical radial shape in plan view, and the in-furnace combustion zone in plan view. Since it is possible to form a substantially symmetrical fan-shaped flame F extending over the entire width or substantially the entire width in the lateral width direction of S, the temperature distribution in the furnace 3 can be made uniform.
[0026]
[Another embodiment]
Next, another embodiment will be described.
(A) The gas fuel is sprayed at a plurality of ejection portions N in a plan view so that the gas fuel ejection nozzle 11 forms a fan-shaped flame that extends over the entire width or substantially the entire width of the in-furnace combustion area. In the case where the fuel cell is integrally formed so as to eject radially, the specific structure is not limited to the structure exemplified in the above embodiment.
For example, as shown in FIG. 8, a plurality of (three in FIG. 8) cylindrical ejection pipes 15 as a plurality of fuel ejection sections N are integrally formed so that the gas fuel ejection nozzles 11 are radially formed in a plan view. Alternatively, it may be configured by assembling them.
[0027]
(B) In the above embodiment, the case where the present invention is applied to an end-port type glass melting furnace is illustrated. However, for example, the present invention can also be applied to a so-called side-port type glass melting furnace. it can.
As shown in FIG. 9, the side-port type glass melting furnace is provided with an inlet 4i in a furnace wall 4 on one side of a rectangular melting tank 2 in a plan view, and the furnace wall 4 provided with the inlet 4i. A work tank 9 is provided outside the furnace wall 4 facing the furnace, and an opening 4e (not shown) for communicating the melting tank 2 and the work tank 9 to the furnace wall 4 between the work tank 9 and the melting tank 2. ) Is formed on the hearth of the melting tank 2.
The combustion device is provided with a pair of combustion sections provided on the furnace wall 4 located on the left and right sides from the input port 4i toward the work tank 9, respectively.
Each of the pair of combustion units supplies combustion air to the furnace 3 in a flow state having a width that is obliquely downward toward the inside of the furnace 3 through an air port 5 (not shown) formed in a furnace wall 4 for installing a combustion device. A gas fuel is injected from below the air supply path 6 (not shown) and below the air port 5 toward the in-furnace combustion zone S in which the combustion air is supplied in a flow state having the lateral width. And a plurality of gas burner sets (four in FIG. 9) including the gas burners B, and one heat storage chamber 8 communicating with a plurality of air supply passages 6 included in the plurality of gas burner sets. It is configured.
Then, the pair of combustion sections are alternately burned at regular intervals to perform alternating combustion, and the glass material is charged into the melting tank 2 through the charging port 4i, and the glass material is melted while taking out the glass hole 4e. , And the clean molten glass is guided to the work tank 9 through the extraction hole 4e.
Also in this case, in-furnace combustion zones S corresponding to the respective air supply paths 6 exist in front of the air ports 5 of the respective air supply paths 6. Correspondingly, the gas burners B are provided one by one. Then, the plurality of ejection portions N of the gas fuel ejection nozzles 11 of each gas burner B form a fan-shaped flame F that spreads over the entire width or substantially the entire width of the corresponding in-furnace combustion zone S in the lateral direction. The gas fuel is jetted radially in plan view.
[0028]
(C) A plurality of ejection portions N eject gas fuel on both sides of an imaginary line passing through the installation location of the gas fuel ejection nozzle 11 and along the direction in which the combustion air is supplied from the air supply passage 6 in plan view. The configuration is not limited to the configuration in which the gas fuel is ejected in a symmetrical radial manner in plan view as exemplified in the above embodiment.
For example, when the gas fuel ejection nozzle 11 is disposed at the center in the width direction of the in-furnace combustion zone S, it is preferable to eject the gas fuel in a radially symmetric manner in plan view. When arranged at a position shifted to the left or right from the corresponding, corresponding to the arrangement position, so that it is possible to form a fan-shaped flame that spreads over the entire width or substantially the entire width of the in-furnace combustion zone S, It is preferable to make the ejection angles of the left and right ejection portions N different in plan view.
[0029]
(D) The number of the ejection portions N provided in the gas fuel ejection nozzle 11 is not limited to the three illustrated in the above embodiment, but may be two or four or more.
[0030]
(E) The ratio of the length to the diameter of the ejection hole 11a is not limited to two or more as exemplified in the above embodiment, and may be smaller than two. Since it is inferior, it is better to make it as large as possible.
[0031]
(F) When the gas fuel ejection nozzle 11 is configured by forming a plurality of ejection holes 11a as a plurality of ejection portions N in a nozzle formation body in a radial manner in a plan view, the shape of the nozzle formation body in a plan view is as follows. However, the shape is not limited to the shape similar to the semicircle as exemplified in the above embodiment, and may be a semicircle or a rectangle.
[0032]
(G) As a means for cooling the gas fuel ejection nozzle 11, in the above-described embodiment, the case where the cooling water jacket 12 that allows the cooling water to flow to cool the gas fuel ejection nozzle 11 is provided. An air cooling jacket that cools the gas fuel jet nozzle 11 by flowing the gas may be provided.
Alternatively, when the temperature in the furnace 3 is low, the means for cooling the gas fuel ejection nozzle 11 can be omitted.
[0033]
(H) As the oxygen-containing gas for combustion supplied from the air port 5 to the inside 3 of the furnace, in addition to the air exemplified in the above embodiment, a mixture of air and a combustion exhaust gas discharged from the inside of the furnace 3 or an oxygen-containing gas may be used. Various materials such as oxygen-enriched air with a high rate can be used.
[0034]
(I) The present invention can be applied to various types of heating furnace combustion devices other than the glass melting furnace exemplified in the above embodiment and the glass melting furnace exemplified in another embodiment shown in FIG. it can.
For example, in addition to the type in which the gas burner B is alternately burned, the present invention can be applied to a continuous combustion type.
Further, the present invention can be applied to a combustion device for a heating furnace provided with one air port 5 and one air supply path 6 as an oxygen-containing gas supply unit.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a glass melting furnace provided with a heating furnace combustion device according to an embodiment. FIG. 2 is a view taken along the line II in FIG. 1. FIG. FIG. 4 is a longitudinal sectional side view of a main part of a glass melting furnace provided with the apparatus. FIG. 4 is a cross-sectional plan view of a main part of a glass melting furnace provided with a combustion device for a heating furnace according to the embodiment. FIG. 6 is a vertical sectional side view of a gas burner of a combustion device for a furnace. FIG. 6 is a front view of a gas burner of a combustion device for a heating furnace according to the embodiment. FIG. FIG. 8 is a plan view of a gas fuel ejection nozzle of a combustion apparatus for a heating furnace according to another embodiment. FIG. 9 is a cross-sectional view of a glass melting furnace provided with a combustion apparatus for a heating furnace according to another embodiment. [Explanation of symbols]
3 In-furnace 6 Oxygen-containing gas supply unit 11 Gas fuel ejection nozzle 11a Injection holes 11b, 11c Nozzle body N Injection unit S In-furnace combustion zone

Claims (4)

An oxygen-containing gas supply unit that supplies the oxygen-containing gas for combustion in a fluid state with a width from the side of the heating furnace toward the upper side of the object to be heated in the furnace,
From the lower part of the oxygen-containing gas supply part of the oxygen-containing gas supply part on the lateral side of the heating furnace, gaseous fuel is ejected toward the in-furnace combustion zone where the oxygen-containing gas is supplied in a flow state having the lateral width. A combustion device for a heating furnace provided with a gas fuel ejection nozzle,
As the gas fuel ejection nozzle, so as to form a fan-shaped flame that spreads over the entire width or substantially the entire width in the width direction of the in-furnace combustion zone in which the oxygen-containing gas is supplied in a flow state with the horizontal width, A combustion device for a heating furnace provided with a single gas fuel ejection nozzle integrally formed so as to eject gas fuel radially in a plan view from a plurality of ejection portions. The combustion device for a heating furnace according to claim 1, wherein the gas fuel ejection nozzle is formed by forming a plurality of ejection holes as the plurality of fuel ejection portions in a nozzle forming body so as to be radial in plan view. . The combustion device for a heating furnace according to claim 2, wherein the ejection hole is formed such that the length of the hole is at least twice the diameter of the hole. The plurality of ejection sections eject gas fuel on both sides of a virtual line passing through the installation location of the gas fuel ejection nozzle and along the supply direction of the oxygen-containing gas for combustion from the oxygen-containing gas supply section in plan view. The combustion device for a heating furnace according to any one of claims 1 to 3, wherein the combustion device is configured to perform heating.

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