JP2007139380A - Combustion device for heating furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device for a heating furnace capable of shortening flame and increasing width of the flame. <P>SOLUTION: In the combustion device for the heating furnace, an oxygen-containing gas supply part for supplying oxygen-containing gas for combustion toward above an object to be heated in the furnace from a side part of the heating furnace is provided and a plurality of fuel blow-out passages 10 for blowing out gas fuel toward a combustion area in the furnace to which the oxygen-containing gas is supplied from an oxygen-containing gas supply part are provided below the oxygen-containing gas supply part in the side part of the heating furnace side by side with clearances in a horizontal direction or an approximately vertical direction. A rotation means 11 for rotating the gas fuel blown from a fuel blow-out passage 10 is provided for each of the plurality of fuel blow-out passages 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention is provided with an oxygen-containing gas supply unit for supplying a combustion oxygen-containing gas from the side portion of the heating furnace toward the upper side of the heating object in the furnace,
Below the oxygen-containing gas supply unit on the side portion of the heating furnace, there are a plurality of fuel ejection passages that eject gas fuel toward the in-furnace combustion zone to which oxygen-containing gas is supplied from the oxygen-containing gas supply unit. The present invention relates to a combustion apparatus for a heating furnace that is arranged in parallel in the horizontal direction or substantially in the horizontal direction.

  Such a combustion apparatus for a heating furnace (hereinafter may be simply referred to as a combustion apparatus) contains oxygen for combustion from the side of the heating furnace toward the upper side of the object to be heated by the oxygen-containing gas supply unit. The oxygen-containing gas is supplied from the oxygen-containing gas supply unit by a plurality of fuel ejection passages that supply gas and are arranged in parallel in the horizontal or substantially horizontal direction below the oxygen-containing gas supply unit on the side portion of the heating furnace. The gas fuel is ejected toward the in-furnace combustion zone to which the gas is supplied so that the gas fuel and the oxygen-containing gas are brought into contact with each other in the furnace to form an integral or substantially integral flame and burn it. It is a thing. For example, it is used for the purpose of forming a flame above the melting tank for melting the glass raw material and heating the melting tank.

  In such a combustion apparatus, conventionally, gas fuel is caused to go straight from each of the plurality of fuel ejection paths in the axial direction of each fuel ejection path (hereinafter sometimes referred to as the ejection path axial direction). It was configured to eject (see, for example, Patent Document 1).

JP 2004-301369 A

By the way, when heating a heating furnace using such a combustion apparatus, it may be desired to shorten the flame length and widen the flame width as described below.
In other words, in the case of a heating furnace having a short length in the furnace along the direction in which the oxygen-containing gas is supplied from the oxygen-containing gas supply section, the flame hits the furnace wall and the durability of the furnace wall decreases as the flame length increases. Therefore, it is desirable to shorten the length of the flame, and in the case of a heating furnace provided with an exhaust port for the gas inside the furnace in the direction of oxygen-containing gas supply from the oxygen-containing gas supply unit, the length of the flame However, since the amount of heat released outside the furnace increases and energy efficiency decreases, it is desirable to shorten the flame length in order to reduce the amount of heat released outside the furnace. In order to reduce the temperature distribution in the furnace in the horizontal direction orthogonal to the oxygen-containing gas supply direction from the oxygen-containing gas supply unit, it is desired to increase the width of the flame.

However, in the conventional combustion apparatus, gas fuel is ejected from each of the plurality of fuel ejection paths so as to travel straight, so that it is difficult to shorten the length of the flame as described below. It was difficult to widen the width.
That is, since the gas fuel ejected from each of the fuel ejection paths has strong straightness, the distance to flow forward in the axial direction of the ejection path becomes longer, and it is difficult to shorten the flame length.
Further, since the gas fuel ejected from each of the fuel ejection paths hardly spreads in a direction perpendicular to the axial direction of the ejection path, it is difficult to widen the flame width.
Incidentally, if the interval between adjacent fuel ejection passages is widened, the gas fuel ejected from the plurality of fuel ejection passages burns in a state in which they form separate flames, so that an integral or substantially integral flame Can not form.

  This invention is made | formed in view of this situation, The objective is to provide the combustion apparatus for heating furnaces which can aim at shortening of the length of a flame and increase of a width | variety.

The combustion apparatus for the heating furnace of the present invention is provided with an oxygen-containing gas supply unit that supplies an oxygen-containing gas for combustion toward the upper side of the heating object in the furnace from the side part of the heating furnace,
Below the oxygen-containing gas supply unit on the side portion of the heating furnace, there are a plurality of fuel ejection passages that eject gas fuel toward the in-furnace combustion zone to which oxygen-containing gas is supplied from the oxygen-containing gas supply unit. , Arranged side by side in the horizontal or substantially horizontal direction,
The first characteristic configuration is characterized in that each of the plurality of fuel ejection paths is provided with a turning means for turning gas fuel ejected from the fuel ejection path.

  That is, since the gas fuel is ejected from each of the plurality of fuel ejection paths in a state of being swirled by the action of the swirling means, the gas fuel ejected from each of the plurality of fuel ejection paths is orthogonal to the axis of the ejection path. It is easy to spread in the direction, and the distance to flow forward in the direction of the jet path axial center is shortened.

That is, the gas fuel ejected from each of the plurality of fuel ejection paths can easily spread in the direction orthogonal to the axial direction of the ejection path, so that the width of the flame can be widened, and it is integral or substantially integral. Although it is possible to widen the interval between the adjacent fuel ejection paths while forming the flame, the width of the flame can be further widened.
In addition, since the distance over which the gas fuel ejected from each of the plurality of fuel ejection passages flows forward in the axial direction of the ejection passage is shortened, the length of the flame can be shortened.
Accordingly, it is possible to provide a combustion apparatus for a heating furnace that can shorten the length of the flame and increase the width thereof.

In addition to the first feature configuration, the second feature configuration is
The plurality of fuel ejection paths are provided in a fuel ejection nozzle provided below the oxygen-containing gas supply unit in the side portion of the heating furnace in a radial state in a plan view. .

  That is, gas fuel is ejected radially from a plurality of fuel ejection passages provided in a radial state in a plan view on the fuel ejection nozzle, with the flow state from each fuel ejection passage being in a swirl flow state. Therefore, the width of the flame can be widened and the length can be shortened while forming an integral or substantially integral flame.

Then, the plurality of fuel ejection paths are provided in a radial state in a plan view on the fuel ejection nozzle provided below the oxygen-containing gas supply section on the side portion of the heating furnace, so that the plurality of fuel ejection paths are provided in the heating furnace. Since the configuration can be simplified as compared with the case where the oxygen-containing gas supply unit is provided one by one in the lateral side portion, the cost of the combustion apparatus can be reduced.
Therefore, it has become possible to provide a combustion apparatus for a heating furnace that can shorten the length of the flame and increase the width thereof while reducing the cost.

The third feature configuration is in addition to the second feature configuration,
As the fuel ejection nozzles, a plurality of fuel ejection nozzles are horizontally or substantially arranged so as to eject gas fuel toward the in-furnace combustion zone to which oxygen-containing gas is supplied from one oxygen-containing gas supply unit. It is characterized in that it is arranged in parallel in the horizontal direction with an interval.

  That is, gas is directed from a plurality of fuel injection nozzles arranged in parallel in the horizontal direction or substantially in the horizontal direction toward a combustion zone in the furnace in which oxygen-containing gas is supplied from one oxygen-containing gas supply unit. Fuel is ejected, and gas fuel flows from a plurality of fuel ejection passages provided in a radial state in each fuel ejection nozzle in a plan view, and the flow state from each fuel ejection passage becomes a swirl flow state. In a state, it is ejected radially.

That is, a plurality of fuel ejection paths corresponding to one oxygen-containing gas supply section are provided to a plurality of fuel ejection nozzles, and each fuel ejection nozzle is provided with a plurality of fuel ejection paths corresponding to one oxygen-containing gas supply section. Of these, a plurality of fuel ejection paths are provided separately in a state of being provided radially in plan view.
The plurality of fuel injection nozzles are horizontally or substantially horizontally spaced so that gas fuel is ejected from one oxygen-containing gas supply section toward the in-furnace combustion zone where the oxygen-containing gas is supplied. As a result, the plurality of fuel ejection passages corresponding to one oxygen-containing gas supply section are integrated or substantially as compared with the case where all of the fuel ejection passages are radially provided in one fuel ejection nozzle in a plan view. While forming an integral flame, the width of the flame can be further increased.
Therefore, the flame width can be further increased.

[First Embodiment]
Hereinafter, based on the drawings, a first embodiment when the present invention is applied to a combustion apparatus for a glass melting furnace will be described.
First, a glass melting furnace which is an example of a heating furnace provided with a combustion apparatus will be described.
As shown in FIGS. 1 and 2, the glass melting furnace is provided with a rectangular melting tank 2 at a lower part in a plan view and a furnace body 1 having an arched ceiling in the center, and one side of the melting tank 2. The glass raw material is charged from a charging port 4i provided in the furnace wall 4 defining the edge, and the molten glass is extracted from a sampling hole 4e formed in the furnace wall 4 facing the furnace wall 4 provided with the charging port 4i. It is.
And the heat storage chamber 3 is extended along the raw material transfer direction on each of the left and right sides of the furnace body 1 with respect to the raw material transfer direction from the charging port 4i toward the take-out hole 4e. A plurality (four in this first embodiment) of air ports (so-called ports) 5 are arranged in parallel along the raw material transfer direction, and the heat storage chamber 3 and each of the air ports 5 are connected by an air supply path 6. The so-called side port type is formed in communication.
That is, the air supply path 6 is configured to supply air as a combustion oxygen-containing gas into the furnace 7 obliquely downward from the air port 5 (corresponding to the oxygen-containing gas supply location) on the side portion of the melting furnace. It corresponds to an oxygen-containing gas supply unit.

  A work tank 8 is provided outside the furnace wall 4 in which the take-out hole 4e is formed and communicated with the melting tank 2 through the take-out hole 4e. And is made to flow toward the work tank 8 so that clean molten glass is guided to the work tank 8 through the take-out hole 4e.

  As shown in FIGS. 3 and 4, the inside of the furnace in which combustion air A is supplied from the air supply path 6 below each of the plurality of air ports 5 in the left and right furnace walls 4 of the furnace body 1. A plurality of fuel ejection passages 10 for ejecting the gaseous fuel G toward the combustion zone are arranged in parallel in the horizontal direction at intervals, and are configured as a so-called underport type. Incidentally, in the first embodiment, two fuel ejection paths 10 are provided for one air supply path 6.

  And in this invention, as shown in FIG.5 and FIG.6, in each of the said several fuel ejection paths 10, the turning body 11 as a turning means which turns the gaseous fuel G injected from the fuel injection path 10 is provided. It is provided.

Further, as shown in FIGS. 3 to 6, the plurality of fuel ejection passages 10 are radiated in a plan view to a fuel ejection nozzle B provided in the furnace wall 4 below the air supply passage 6. It is provided as follows.
Incidentally, in the first embodiment, all of the plurality of (two in the first embodiment) fuel ejection paths 10 corresponding to the one air supply path 6 are disposed below the one air supply path 6. One provided fuel jet nozzle B is provided.

  That is, the combustion apparatus includes a plurality of air supply paths 6 provided to supply combustion air A to the furnace 7 from the plurality of air ports 5 provided on the left and right furnace walls 4 as described above, A plurality of gas fuels G are respectively provided below the air supply passages 6 in the left and right furnace walls 4 so as to eject the gas fuel G toward the in-furnace combustion zone where the combustion air A is supplied from the air supply passages 6. The fuel injection nozzle B is provided.

  The left and right fuel injection nozzles B alternately repeat the injection of gas fuel G and stop the injection every predetermined time (for example, about 15 to 30 minutes), and as shown in FIGS. 1 and 2, the gas fuel G is injected. Combustion air A preheated to a high temperature (about 1000 to 1200 ° C.) through the heat storage chamber 3 is supplied to the furnace 7 from the air outlet 5 on the side of the fuel injection nozzle B, and the gas fuel G So-called alternating combustion in which the combustion gas E in the furnace 7 is discharged from the air port 5 on the side of the fuel injection nozzle B where the injection of the fuel is stopped, and is alternately burned by the left and right fuel injection nozzles B. It is supposed to be done. 1 and 2 show a state in which combustion is performed by the left fuel injection nozzle B. FIG.

Then, the combustion air A supplied from the air port 5 and the fuel injection nozzle B below the air port 5 are ejected from the air port 5 toward the in-furnace combustion region where the combustion air A is supplied. The gas fuel G thus made contacts in the furnace 7 and diffuses and burns to form a flame F including a high-luminance luminous flame.
In the heat storage chamber 3, when the combustion gas E is discharged, the exhaust heat is recovered from the combustion gas E into the heat storage material to store heat, and when the combustion air A is supplied, the heat storage chamber 3 is burned by the heat storage of the heat storage material. Preheat air A. The combustion air A thus preheated flows through the air supply path 6 and is supplied from the air port 5 into the furnace 7.

  The installation structure of the fuel injection nozzle B will be described. As shown in FIGS. 3 and 4, nozzle mounting holes are provided below the plurality of air ports 5 in the left and right furnace walls 4 of the furnace body 1. 4s is provided one by one, and the long fuel injection nozzle B is inserted into each nozzle mounting hole 4s toward the in-furnace combustion region where the combustion air A is supplied from the air supply path 6. G is ejected.

The inner peripheral surface of the inner part of the furnace in each nozzle mounting hole 4s is formed so as to widen toward the inner side of the furnace.
Then, the gas fuel ejected from the fuel ejecting nozzle B is provided in each nozzle mounting hole 4s by inserting the fuel ejecting nozzle B in a state where the tip of the fuel ejecting nozzle B is retracted from the forwardly expanding inner peripheral surface portion. Is stably combusted in a state where the flame is held on the inner circumferential surface of the nozzle mounting hole 4s.

Hereinafter, the combustion apparatus will be described.
When the fuel injection nozzle B is described further, as shown in FIGS. 3 to 5, the fuel injection nozzle B includes two circular fuel injection holes 12 as the plurality of fuel injection passages 10. The nozzle portion 13 and a fuel supply pipe portion 14 that can be screwed to the tip of the nozzle portion 13 are configured, and a fuel supply passage 15 that supplies gas fuel to the base end portion of the fuel supply pipe portion 14. Are connected, and the gas fuel supplied through the fuel supply passage 15 is ejected from the nozzle portion 13.

The fuel supply path 15 is provided in two systems: one connected to a plurality of fuel injection nozzles B provided on the left furnace wall 4 and one connected to a plurality of fuel injection nozzles B provided on the right furnace wall 4. The fuel supply passage 15 of each system includes a fuel interrupt valve 16 for intermittently supplying gas fuel to the plurality of fuel injection nozzles B connected to the fuel supply passage 15, and the plurality of fuel injection nozzles B. A fuel supply amount adjustment valve 17 for adjusting the supply amount of the gas fuel to is provided.
Then, by alternately opening and closing the fuel intermittent valve 16 in each of the two fuel supply passages 15, the left and right fuel injection nozzles B perform alternating combustion, and the fuel supply amount adjusting valve 17 By adjusting the opening, the amount of gas fuel supplied to each fuel injection nozzle B is adjusted to adjust the amount of combustion.

  As shown in FIGS. 5 and 6, the nozzle portion 13 is formed in a closed portion of a cylindrical jet portion forming body having one end closed and a female screw 13 n formed at the other end. In the state where the two fuel ejection holes 12 penetrating in the axial direction are distributed to both sides of the axial center P1 of the ejection portion forming body as viewed in the radial direction of the ejection portion forming body, the fuel is closer to the end side. It is formed so as to have a radial shape in which the interval between the ejection holes is wide.

  As shown in FIG. 5, a male screw 14 n is formed at the tip of the fuel supply pipe portion 14 so that the female screw 13 n of the nozzle portion 13 can be screwed.

Based on FIG. 5 thru | or FIG. 7, the said turning body 11 is added. 7A is a front view of the revolving structure 11, and FIG. 7B is a perspective view of the revolving structure 11. FIG.
The revolving body 11 has a circular arc shape on the side circumferential surface of a cylindrical body that can be fitted in the fuel injection hole 12, extending over both axial ends of the cylindrical body and viewed in the axial direction of the cylindrical body. The four concave grooves 11m are formed so as to be arranged at equal intervals in the circumferential direction in a state inclined to the same side with respect to the axis P2 of the columnar body as viewed in the radial direction of the columnar body. It is configured. Incidentally, the angle at which the concave groove 11m is inclined with respect to the axis P2 of the cylindrical body in the radial direction view of the cylindrical body is set to a range of 15 ° to 45 °, for example, 30 °.

  Then, the revolving body 11 formed as described above is provided in the two fuel ejection holes 12 of the nozzle portion 13 so as to fit inside, and the gas fuel ejected from the fuel ejection holes 12 is revolved. It is.

Next, the combustion form by the combustion apparatus comprised as mentioned above is demonstrated.
As shown in FIGS. 3 to 5, the gas fuel G supplied from the fuel supply passage 15 to the fuel injection nozzle B is two fuel injections provided in the fuel injection nozzle B in a radial state in plan view. From the hole 12, it is ejected radially toward the in-furnace combustion region where the combustion air A is supplied from the air supply path 6 in a state where the flow state from each fuel injection hole 12 becomes a swirl flow state.
The gas fuel G ejected in a swirling flow state from each fuel ejection hole 12 is likely to spread in a direction orthogonal to the axial direction of the fuel ejection hole 12 (hereinafter sometimes referred to as the ejection hole axial direction). In addition, since the distance to flow forward in the axial direction of the ejection hole is shortened, the gas fuel G ejected from the two fuel ejection holes 12 of the fuel ejection nozzle B is integrally formed with almost no gap in plan view. While burning so as to form a flame F, the length of the flame F thus formed can be made sufficiently short and the width can be made sufficiently wide.

[Second Embodiment]
Hereinafter, the second embodiment of the present invention will be described, but the same components as those in the first embodiment and the components having the same action are omitted by giving the same reference numerals in order to avoid duplicate description, A configuration different from the first embodiment will be mainly described.

  As shown in FIG. 8, in the second embodiment, combustion air A is supplied from a plurality of (two in the second embodiment) fuel injection nozzles B through one air supply path 6. The gas fuel G is jetted toward the in-furnace combustion zone, and the gas fuel G is juxtaposed at intervals in the horizontal or substantially horizontal direction.

In addition, in the second embodiment, four fuel ejection paths 10 are provided for one air supply path 6.
Then, four fuel injection holes 12 as a plurality of fuel injection paths 10 corresponding to one air supply path 6 are provided in the two fuel injection nozzles B, and the fuel injection holes 12 are provided in each fuel injection nozzle B. Two are provided separately in a state of being provided radially in plan view.

  The fuel injection nozzle B is configured in the same manner as in the first embodiment, but of the plurality of fuel injection nozzles B arranged in parallel on the left and right furnace walls 4, the fuel injection nozzles at both ends in the arrangement direction. The formation form of the two fuel injection holes 12 in B (hereinafter sometimes referred to as an end fuel injection nozzle Bs) is referred to as another fuel injection nozzle B (hereinafter referred to as an inner fuel injection nozzle Bi). This is different from the form in which the two fuel ejection holes 12 are formed. Incidentally, the formation form of the two fuel injection holes 12 in the fuel injection nozzle Bi for the inner side is the same as that in the first embodiment.

Hereinafter, the formation form of the two fuel ejection holes 12 in the end fuel ejection nozzle Bs will be described.
As shown in FIGS. 9 and 10, one of the two fuel injection holes 12 (hereinafter, sometimes referred to as a straight fuel injection hole 12) has an axial center at the nozzle portion. 13 is parallel to the axis P1 and the other fuel injection hole 12 is inclined so that the distance from the straight fuel injection hole 12 becomes wider toward the tip side. 13 is formed so as to be radial when viewed from the radial direction of the ejection portion forming body.

  As shown in FIG. 8, below each air supply path 6, two fuel ejection nozzles B are included in all (four in this embodiment) fuel ejection holes 12 included in these two fuel ejection nozzles B. So that the gas fuel G ejected from the combustion chamber in a plan view forms a substantially integrated flame F that is continuous at least in the combustion air supply direction from the air supply passage 6 in the combustion air supply direction. They are arranged in parallel in the horizontal direction or in the substantially horizontal direction.

Further, the end fuel injection nozzle Bs is provided in such a posture that the straight fuel injection hole 12 is located outside the arrangement direction of the plurality of fuel injection nozzles B.
When the end fuel injection nozzle Bs is provided in this way, the flame F formed by the end fuel injection nozzle Bs comes into contact with the furnace wall 4 adjacent to the arrangement direction of the plurality of fuel injection nozzles B. Since it can prevent, the fall of durability of the furnace wall 4 can be suppressed.

[Another embodiment]
Next, another embodiment will be described.
(A) The combustion apparatus of the present invention is not limited to the side port type glass melting furnace exemplified in the above embodiments, but is used in a so-called end port type glass melting furnace as shown in FIGS. Can also be applied.
Hereinafter, the endport type glass melting furnace will be described.
A pair of left and right heat storage chambers 3 are provided outside the furnace wall 4 forming one side surface of the furnace body 1, and one air port 5 is formed in the furnace wall 4 corresponding to each heat storage chamber 3, Each heat storage chamber 3 and each air port 5 are communicated with each other through an air supply path 6.
Two nozzle mounting holes 4 s are provided below the pair of left and right air ports 5 in the furnace wall 4 in which the pair of left and right air ports 5 are formed, and each nozzle mounting hole 4 s is provided with the first embodiment. Similar fuel injection nozzles B are provided in the same manner as in the first embodiment, and alternate combustion is performed using the left and right fuel injection nozzles B.
That is, four fuel injection holes 12 are provided for one air supply path 6.
Then, four fuel injection holes 12 corresponding to one air supply path 6 are formed in two fuel injection nozzles B, and each fuel injection nozzle B has two fuel injection holes 12 in a radial view in plan view. They are provided separately.

A glass raw material inlet 4i is provided at the end of the fuel injection nozzle B side of the furnace wall 4 forming a side surface adjacent to one of the side surfaces provided with the fuel injection nozzle B, and the fuel injection nozzle B is provided on the side surface provided with the fuel injection nozzle B. A work tank 8 is provided outside the furnace wall 4 that forms the opposite side faces, and a take-out hole that allows the melting tank 2 and the work tank 8 to communicate with the furnace wall 4 between the work tank 8 and the melting tank 2. 4e is formed.
That is, the glass raw material is introduced into the melting tank 2 from the inlet 4i, and the glass raw material is directed from the side surface where the fuel injection nozzle B is provided toward the side extraction hole 4e facing the longitudinal direction of the flame F. The molten glass is melted while being flown along the flow path, and clean molten glass is guided to the working tank 8 through the take-out hole 4e.

(B) The number of the plurality of fuel ejection paths 10 provided for one air supply path 6 is not limited to the two or four illustrated in the first and second embodiments, but is 3 It may be 5 or more.
Further, the plurality of fuel ejection nozzles B are spaced horizontally or substantially horizontally so that the gas fuel is ejected from one air supply path 6 toward the combustion area in the furnace where combustion air is supplied. In the case where they are arranged apart from each other, the number of fuel ejection nozzles B with respect to one air supply path 6 is not limited to the two illustrated in the second embodiment, and may be three or more.
When a plurality of air supply paths 6 are provided, the number of fuel ejection nozzles B provided in parallel with respect to one air supply path 6 may be varied.

Therefore, the number of the plurality of fuel injection holes 12 provided in one fuel injection nozzle B is not limited to the two illustrated in the first and second embodiments, but one air supply. The number of fuel ejection paths 10 provided for the path 6 and the number of fuel ejection nozzles B provided for one air supply path 6 are changed.
For example, as shown in FIG. 13, one fuel injection nozzle B is provided with three fuel injection holes 12 in a radial state in plan view, or as shown in FIG. 14, one fuel injection nozzle B In addition, four fuel injection holes 12 may be provided in a radial state in plan view.
13 and 14, (a) is a longitudinal sectional view of the nozzle portion 12 of the fuel injection nozzle B, and (b) is a front view of the nozzle portion 12 of the fuel injection nozzle B.

  Further, the plurality of fuel injection nozzles B arranged in parallel may include those having different numbers of fuel injection holes 12.

(C) The shape of the fuel injection hole 12 as the fuel injection passage 10 formed in the fuel injection nozzle B is not limited to the circular hole exemplified in the above embodiment.
For example, as shown in FIG. 15, the fuel injection nozzle B is provided with a fuel injection hole 12 having a long hole shape whose cross-sectional shape is an ellipse or the like in a state where the longitudinal direction thereof is along the arrangement direction of the plurality of fuel injection holes 12. Also good. Incidentally, in FIG. 15, (a) is a longitudinal sectional view of the nozzle portion 12 of the fuel injection nozzle B, and (b) is a front view of the nozzle portion 12 of the fuel injection nozzle B.
In this case, since the gas fuel is ejected in a flat shape from each fuel ejection hole 12 in a swirling state, the width of the flame can be further increased.

(D) In the above embodiment, the plurality of fuel injection holes 12 as the plurality of fuel injection paths 10 are provided in the fuel injection nozzle B provided below the air supply path 6 in the side portion of the heating furnace. Although the case where it is provided in a state of being radial in a plan view is illustrated, a plurality of fuel ejection pipes having the inside as a fuel ejection path 10 are arranged in the horizontal direction or substantially below the air supply path 6 in the side portion of the heating furnace. You may arrange in parallel at intervals in the horizontal direction. In this case, each of the plurality of fuel ejection pipes is provided with a turning means for turning the gas fuel ejected from the fuel ejection passage 10 of each fuel ejection pipe.

(E) The specific configuration of the swirling means for swirling the gas fuel ejected from the fuel ejection path 10 is not limited to the swiveling body 11 exemplified in the above embodiment.
For example, as shown in FIGS. 13 to 15, a plurality of plate-like blade bodies 18 w can be configured with swirl blades 18 arranged in a state of being aligned in the circumferential direction of the fuel ejection path 10.
Or although illustration is abbreviate | omitted, in the closed part of the cylindrical ejection part formation body which the one end part similar to said embodiment obstruct | occluded, in the several slit formed at intervals in the circumferential direction of the ejection part formation body Can be configured.

(F) As the combustion oxygen-containing gas supplied from the air port 5 to the furnace interior 7, in addition to the air exemplified in the above embodiment, a mixture of the combustion exhaust gas discharged from the furnace 7 into the air, Various things such as oxygen-enriched air with a high rate can be used.

(G) The present invention is applicable to various heating furnace combustion apparatuses other than the glass melting furnace exemplified in the above embodiment and the glass melting furnace exemplified in another embodiment shown in FIGS. can do.

Vertical sectional view of the glass melting furnace according to the first embodiment Fig. 1 arrow view The longitudinal cross-sectional view of the principal part of the glass melting furnace which concerns on 1st Embodiment Cross-sectional plan view of the main part of the glass melting furnace according to the first embodiment The longitudinal cross-sectional view of the principal part of the fuel injection nozzle which concerns on 1st Embodiment The front view of the fuel injection nozzle which concerns on 1st Embodiment The figure which shows the turning body which concerns on 1st Embodiment. Transverse plan view of a glass melting furnace according to the second embodiment The longitudinal cross-sectional view of the principal part of the fuel injection nozzle which concerns on 2nd Embodiment The front view of the fuel injection nozzle which concerns on 1st Embodiment Vertical sectional view of a glass melting furnace according to another embodiment FIG. The figure which shows the principal part of the fuel injection nozzle which concerns on another embodiment. The figure which shows the principal part of the fuel injection nozzle which concerns on another embodiment. The figure which shows the principal part of the fuel injection nozzle which concerns on another embodiment.

Explanation of symbols

6 Oxygen-containing gas supply section 7 In the furnace 10 Fuel ejection passages 11 and 18 Rotating means B Fuel ejection nozzle

Claims (3)

An oxygen-containing gas supply unit that supplies a combustion oxygen-containing gas toward the upper side of the heating object in the furnace from the side portion of the heating furnace is provided,
Below the oxygen-containing gas supply unit on the side portion of the heating furnace, there are a plurality of fuel ejection passages that eject gas fuel toward the in-furnace combustion zone to which oxygen-containing gas is supplied from the oxygen-containing gas supply unit. A combustion apparatus for a heating furnace arranged in parallel in the horizontal direction or substantially in the horizontal direction,
A combustion apparatus for a heating furnace, wherein each of the plurality of fuel ejection paths is provided with a swirling means for swirling gas fuel ejected from the fuel ejection path.   2. The plurality of fuel ejection paths are provided in a fuel ejection nozzle provided below the oxygen-containing gas supply unit in the side portion of the heating furnace in a state of being radial in a plan view. Combustion device for heating furnace.   As the fuel ejection nozzles, a plurality of fuel ejection nozzles are horizontally or substantially arranged so as to eject gas fuel toward the in-furnace combustion zone to which oxygen-containing gas is supplied from one oxygen-containing gas supply unit. The combustion apparatus for a heating furnace according to claim 2, wherein the combustion apparatus is arranged side by side in the horizontal direction at intervals.

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