JP4148965B2 - Combustion equipment for heating furnace - Google Patents

Description

The present invention includes a fuel ejection portion that ejects gaseous fuel into the furnace,
Oxygen-containing gas supply for supplying a combustion oxygen-containing gas to a combustion area of gas fuel ejected from the fuel ejection section from an oxygen-containing gas supply port provided at a location different from the gas fuel ejection location of the fuel ejection section Are provided,
The fuel ejection portion includes an outer cylindrical body and an inner cylindrical body coaxially, forms a central ejection path in the cylinder of the inner cylindrical body, and the inner cylindrical body and the outer cylinder. The present invention relates to a combustion apparatus for a heating furnace configured so as to form an annular peripheral jet passage between the cylindrical body and the annular body.

  Such a combustion apparatus for a heating furnace (hereinafter sometimes simply referred to as a combustion apparatus) ejects gaseous fuel into the furnace by a fuel ejection section, and oxygen at a location different from the location where the fuel ejection section of the fuel ejection section is located. By supplying the oxygen-containing gas for combustion from the contained gas supply port to the combustion region of the gas fuel ejected from the fuel ejection part, the gas fuel and the oxygen-containing gas are brought into contact with each other in the furnace to form a flame. For example, it is used for the purpose of heating the melting tank by forming a flame above the melting tank for melting the glass raw material.

  In addition, such a combustion apparatus includes a fuel ejection portion, an outer cylindrical body and an inner cylindrical body that are coaxially formed, forms a central ejection path in the cylinder of the inner cylindrical body, and an inner cylindrical body. An annular peripheral jet passage is formed between the outer cylinder and the outer cylindrical body, and the gas fuel is jetted from the peripheral jet passage in a state covering the periphery of the gas fuel jetted from the central jet passage. The luminous flame is formed by suppressing the contact between the gas fuel ejected from the central ejection path and the oxygen-containing gas for combustion, and burning the gas fuel while generating carbon particles.

In such a combustion apparatus, the shape of the flame formed in the furnace is changed by changing the ratio of the amount of gas fuel jetted from the central jet passage and the amount of gas fuel jetted from the surrounding jet passage. It is configured to do.
In other words, when the ratio of the amount of gas fuel ejected from the central ejection path is increased, the ejection speed of the gas fuel from the central ejection path is increased and the ejector action is strengthened, thereby facilitating the suction of the oxygen-containing gas for combustion. Combustion becomes faster and the length of the flame can be shortened. Conversely, if the ratio of the amount of gas fuel ejected from the central ejection path is reduced, the ejector action becomes weaker and the combustion oxygen-containing gas Since the suction of the gas is weakened and the combustion is delayed, the length of the flame can be increased.
For example, changing the length of the flame according to the shape in the furnace, such as shortening the length of the flame as the length in the furnace in the direction along the direction of gas fuel ejection from the gas fuel ejection section becomes shorter become.

  In such a combustion apparatus, conventionally, a fuel supply path for supplying gas fuel to the fuel ejection section is branched into a central ejection path and a surrounding ejection path, and the central ejection path and the surrounding ejection are divided by these branch paths. In addition to supplying gas fuel separately to the road, each branch passage is provided with a fuel adjustment valve for adjusting the distribution ratio that adjusts the amount of gas fuel supplied, and adjusting the fuel adjustment valve for adjusting the distribution ratio Thus, the ratio of the amount of gas fuel ejected from the central ejection path and the amount of gas fuel ejection from the surrounding ejection path is changed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2004-294042

  However, in the conventional combustion apparatus, when the shape of the flame can be changed, the fuel supply passage is branched into a central jet passage and a peripheral jet passage, and a fuel control valve for adjusting a distribution ratio is provided in each branch passage. Therefore, there is a problem that the weight of the combustion apparatus increases and the price increases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a combustion apparatus for a heating furnace that can reduce the weight and the cost while allowing the shape of a flame formed in the furnace to be changed. There is.

A combustion apparatus for a heating furnace according to the present invention includes a fuel ejection portion that ejects gaseous fuel into the furnace,
Oxygen-containing gas supply for supplying a combustion oxygen-containing gas to a combustion area of gas fuel ejected from the fuel ejection section from an oxygen-containing gas supply port provided at a location different from the gas fuel ejection location of the fuel ejection section Are provided,
The fuel ejection portion includes an outer cylindrical body and an inner cylindrical body coaxially, forms a central ejection path in the cylinder of the inner cylindrical body, and the inner cylindrical body and the outer cylinder. It is configured so as to form an annular peripheral ejection path with the body,
The first characteristic configuration is provided such that a fuel supply section that supplies gas fuel to the fuel ejection section supplies gas fuel to the central ejection path,
The fuel ejection part is configured to supply a part of the gas fuel supplied to the central ejection path to the ambient ejection path through a communication part that communicates the central ejection path and the surrounding ejection path.
Distribution ratio adjusting means for adjusting a distribution ratio for distributing the gas fuel supplied to the central ejection path to the surrounding ejection path through the communication part is provided in the fuel ejection part,
The distribution ratio adjusting means passes the gas fuel at a location upstream of the central jet outlet at the tip thereof in the central jet passage and upstream of the communication portion in the gas fuel flow direction. is constructed by detachably attached to the distribution ratio setting member provided with a passage hole to limit,
The inner peripheral surface of the portion on the tip side of the inner cylindrical body where the distribution ratio setting body is provided is a large isometric portion having a substantially equal diameter in a direction along the axis of the inner cylindrical body. A tapered portion extending from the tip of the large isometric portion to the outer peripheral surface and the inner peripheral surface with a smaller diameter toward the tip side, and a small isometric portion extending from the tip of the tapered portion to the same diameter. It is characterized by being composed of

That is, gas fuel is supplied to the central jet passage by the fuel supply unit, and part of the gas fuel supplied to the central jet passage is supplied to the peripheral jet passage through the communicating portion and is jetted from the central jet passage. Since the gas fuel is ejected from the surrounding ejection path in a state of covering the periphery of the gas, the gas fuel ejected from the fuel ejection portion can be burned while forming a luminous flame.
Then, by adjusting the distribution ratio of distributing the gas fuel supplied to the central ejection passage to the surrounding ejection passage through the communication portion by the distribution ratio adjusting means provided in the fuel ejection portion, the gas fuel from the central ejection passage is adjusted. The shape of the flame formed in the furnace can be adjusted by adjusting the ratio of the amount of gas jetted and the amount of gas fuel ejected from the surrounding jet passage.

That is, the fuel supply section as a fuel supply section is configured to supply gas fuel separately to the central ejection path and the surrounding ejection path, for example, by branching the fuel supply path toward the central ejection path and the surrounding ejection path. And the central jet passage and the peripheral jet passage, such as two fuel control valves for adjusting the distribution ratio, which are provided separately in the branch passage for the central jet passage and the branch passage for the peripheral jet passage in the fuel supply passage, respectively. The ratio of the amount of gas fuel from the central jet passage and the amount of gas fuel from the surrounding jet passages while eliminating the need for valves for adjusting the distribution ratio for adjusting the amount of gas fuel supplied to each It is possible to change the shape of the flame formed in the furnace.
Accordingly, it is possible to provide a combustion apparatus for a heating furnace capable of reducing the weight and cost while making it possible to change the shape of the flame formed in the furnace.
Further, the distribution ratio adjusting means is configured by detachably providing a distribution ratio setting body having a passage hole for restricting the passage of the gas fuel at a location downstream of the communication hole in the central jet passage in the gas fuel flow direction. Therefore, the distribution ratio setting body provided in the fuel ejection section is replaced with one having a different area of the passage hole, and the flow resistance of the gas fuel in the central ejection path is changed, thereby being supplied to the central ejection path. By changing the distribution ratio for distributing the gas fuel to the surrounding jet passage through the communication part, the ratio of the gas fuel jet amount from the central jet passage and the gas fuel jet amount from the peripheral jet passage can be adjusted, Therefore, the shape of the flame formed in the furnace can be changed.
Then, the distribution ratio setting body constituting the distribution ratio adjusting means can be configured to be light and small, for example, by forming a plate shape by drilling a passage hole in a plate material, and distributing the distribution ratio setting body. The ratio adjusting means can be reduced in weight and size.
Therefore, since the distribution ratio adjusting means can be reduced in weight and size, the combustion apparatus can be further reduced in weight, and the combustion apparatus can be reduced in size.

In addition to the first feature configuration, the second feature configuration is
A swirling means for swirling gas fuel ejected from the peripheral jet passage is provided in the peripheral jet passage.

That is, since the gas fuel is ejected from the annular peripheral ejection path in a state of being swirled by the swirling action of the swirling means, the gas fuel is ejected from the fuel ejecting portion so as to spread outward in the radial direction of the fuel ejecting portion. Thus, the length of the flame formed in the furnace can be shortened and the width can be widened.
Also, the swirling gas fuel flow ejected from the annular peripheral ejection passage covers the periphery of the gas fuel ejected from the central ejection passage, thereby containing the gas fuel ejected from the central ejection passage and combustion oxygen. Since the contact with the gas can be further suppressed, the carbon particles can be burned while being efficiently generated, and the generation rate of the bright flame can be further improved.
Accordingly, it is possible to shorten the length of the flame and increase the width, and to further improve the generation rate of the bright flame.

In addition to the first or second feature configuration, the third feature configuration is
The fuel ejection portion is configured to include the outer cylindrical body and the inner cylindrical body in a state in which a distal end of the outer cylindrical body protrudes from a distal end of the inner cylindrical body,
The inner peripheral surface on the front end side of the outer cylindrical body has a tapered converging inner peripheral surface portion having a smaller diameter toward the front end side, and extends from the front end of the inner peripheral surface portion for converging to the same diameter or toward the front end side. It is characterized by comprising a guide inner peripheral surface portion extending in a divergent shape having a large diameter.

  That is, the gas fuel flowing through the surrounding jet passage is used for convergence in a state where the flow velocity is increased at the tapered inner peripheral surface portion of the inner peripheral surface on the distal end side of the outer cylindrical body. Since the guide inner peripheral surface portion extending from the tip of the inner peripheral surface portion is straight or widened, it is guided so as to go straight or expand, and is ejected from the outer cylindrical body. The fuel is ejected in a state in which the ejection direction is stable, and a flame with a strong flame that is hard to be beaten by the atmosphere in the furnace can be formed.

For example, when the guide inner peripheral surface portion has an equal diameter, a relatively long and narrow flame can be formed, and when the guide inner peripheral surface portion is widened, the guide inner peripheral surface portion is relatively short. A wide flame and a strong flame can be formed.
Accordingly, it has become possible to form a flame with a strong flame that is difficult to be beaten by the atmosphere in the furnace in a relatively elongated shape or a relatively short and wide shape.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which the present invention is applied to a combustion apparatus for a glass melting furnace will be described based on the drawings.
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 with respect to the raw material transfer direction which goes to the taking-out hole 4e from the inlet 4i, the thermal storage chamber 3 is extended along the raw material transfer direction on each of the left and right sides of the furnace body 1, and the left and right furnace walls 4 of the furnace main body 1 are In the upper part, a plurality of air ports (so-called ports) 5 are arranged side by side along the raw material transfer direction, and the heat storage chamber 3 and each air port 5 are communicated with each other through an air supply path 6 to form a so-called side port type. It is.
That is, the air supply path 6 is configured to supply air from the air port 5 (corresponding to an oxygen-containing gas supply port) on the side of the melting furnace to the furnace 7 as an oxygen-containing gas for combustion. It corresponds to the contained 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 FIG. 3, a fuel ejection portion mounting hole 4 s is provided below each of the plurality of air ports 5 in the left and right furnace walls 4 of the furnace body 1, and a long length for ejecting gas fuel into the furnace 7. A fuel injection part B is provided in each of the plurality of fuel injection part mounting holes 4 s in a state in which the tip is retracted from the inner surface of the furnace wall 4.
The air supply path 6 is configured to supply combustion air to the combustion region of the gas fuel ejected from the fuel ejection section B in an obliquely downward direction from the air port 5.

When the installation structure of the fuel ejection part B is described, as shown in FIG. 3, the inner peripheral surface of the inner part of the furnace in each fuel ejection part mounting hole 4s is formed so as to expand toward the inner side of the furnace. It is.
Each fuel ejection portion mounting hole 4s is provided with a fuel ejection portion B inserted through the tip of the fuel ejection portion B in a state where the tip of the fuel ejection portion B is retracted from the forwardly expanding inner peripheral surface portion.

  That is, the combustion apparatus according to the present invention includes a plurality of fuel ejection portions B provided on the left and right furnace walls 4 as described above, and an air outlet 5 provided above each fuel ejection portion B. A plurality of air supply passages 6 are provided so as to supply combustion air A to the combustion region of the gas fuel G ejected from B, and are configured as a so-called underport type.

  The left and right fuel ejection parts B repeat the ejection of gas fuel G and the ejection stop alternately every certain time (for example, about 15 to 30 minutes), and the fuel ejection part B on the side of the fuel ejection part B ejecting the gas fuel G From the air port 5, the combustion air A preheated to high temperature (about 1000-1200 degreeC) through the thermal storage chamber 3 is supplied to the furnace 7, and the fuel injection part which has stopped the injection of the gas fuel G The combustion gas E in the furnace 7 is discharged from the air port 5 on the B side, and so-called alternating combustion is performed in which combustion is alternately performed in the left and right fuel ejection portions B. 1 to 3 show a state in which combustion is performed at the left fuel injection portion B. FIG.

Combustion air A is supplied from an air port 5 provided with a fuel ejection portion B that ejects the gas fuel G along the ejection direction around the gas fuel G ejected from the fuel ejection portion B. Then, the gas fuel G and the combustion air A come into contact with each other to diffuse and burn, so-called slow combustion, and a flame F including a bright luminance flame is formed. The glass raw material is melted. The arched ceiling of the furnace body 1 reflects the radiant heat of the combustion flame.
The combustion gas E in the furnace 7 flows into the heat storage chamber 3 from the air outlet 5 on the side of the fuel injection portion B where the injection of the gaseous fuel G is stopped, passes through the heat storage material, and is exhausted to the heat storage material. After being recovered, it is exhausted.
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 to the furnace 7.

Hereinafter, the combustion apparatus will be described with reference to FIGS.
6 is a view taken in the direction of arrows in FIG. 5, and FIG. 7 is a view seen in the direction of arrows in FIG.
As shown in FIGS. 4 to 7, the fuel ejection portion B is configured such that the outer cylindrical body 10 and the inner cylindrical body 20 are protruded from the distal end of the inner cylindrical body 20 at the distal end of the outer cylindrical body 10. The central jet passage 31 is formed in the cylinder of the inner cylindrical body 20 and the annular peripheral jet passage 32 is formed between the inner cylindrical body 20 and the outer cylindrical body 10. It is constituted as follows. In addition, since the outer cylindrical body 10 and the inner cylindrical body 20 are coaxially-centered, in the following, the axial centers of the outer cylindrical body 10 and the inner cylindrical body 20 are unified, Sometimes called.

  In the present invention, the fuel supply passage 33 serving as a fuel supply portion for supplying gas fuel to the fuel injection portion B is disposed at the rear of the inner cylindrical body 20 so as to supply gas fuel to the central injection passage 31. A gas supplied to the central ejection path 31 through a plurality of communication holes 34 serving as communication sections that communicate with the central ejection path 31 and the surrounding ejection path 32. A part of the fuel is configured to be supplied to the peripheral jet passage 32, and a distribution ratio (hereinafter, referred to as “distribution ratio”) for distributing the gas fuel supplied to the central jet passage 31 to the peripheral jet passage 32 through the plurality of communication holes 34. A distribution ratio adjusting means S for adjusting a gas fuel distribution ratio from the central ejection path 31 to the surrounding ejection path 32 may be provided in the fuel ejection section B.

In the fuel supply path 33, a fuel interrupt valve 37 for intermittently supplying gas fuel to the fuel ejection part B, and a fuel supply amount adjusting valve 38 for adjusting the gas fuel supply quantity to the fuel ejection part B are provided. Is provided.
In other words, the fuel supply amount adjusting valve 38 adjusts the amount of gas fuel supplied to the entire fuel injection portion B to adjust the combustion amount. Although the details will be described later, the distribution ratio adjusting means S controls the central injection. The shape of the flame F formed in the furnace 7 is changed by changing the ratio of the amount of gas fuel jetted from the passage 31 and the amount of gas fuel jetted from the surrounding jet passage 32.

  The inner cylindrical body 20 includes a long cylindrical inner cylinder main body portion 21 and an inner cylinder nozzle portion 22 that is detachably connected to the tip of the inner cylinder main body portion 21 and is configured in a long shape. The outer cylindrical body 10 includes a cylindrical outer cylinder main body 11 and a cylindrical outer cylinder cap 12 that is detachably connected to the tip of the outer cylinder main body 11. The outer cylindrical body 10 is provided on the outer peripheral portion of the inner cylindrical body 20 in a state of being biased toward the distal end side of the elongated inner cylindrical body 20, and the plurality of communication holes 34 are formed in the inner cylindrical shape. It is provided in a portion of the body 20 located in the outer cylindrical body 10.

The outer cylindrical body 10 and the inner cylindrical body 20 will be further described.
As shown in FIGS. 4 and 5, a ring-shaped cover plate 13 is attached to the rear end opening of the outer cylinder main body 11 by welding, and the tip of the inner cylinder main body 21 is used as a hole in the cover plate 13. In the inserted state, the inner cylinder main body 21 is fixed to the bottom plate 13 by welding, and the outer cylinder main body 11 and the inner cylinder main body 21 are integrally assembled coaxially.
Hereinafter, the assembly in which the outer cylinder main body 11 and the inner cylinder main body 21 are integrally assembled coaxially as described above may be referred to as a fuel ejection part main body Bm.

  As shown in FIG. 5, a male screw portion 11 s is formed at the tip of the outer cylinder main body portion 11, and a screw is inserted into the male screw portion 11 s of the outer cylinder main body portion 21 at the rear end of the outer cylinder cap portion 12. An externally threaded part 12s is formed, and the externally threaded part 12s of the externally cylindrical cap part 12 is screwed into the externally threaded part 11s of the externally cylindrical body part 11 so that the externally cylindrical cap part 12 is connected to the externally cylindrical body part 11 of the external cylinder body part 11. It is configured to be detachably connectable to the tip.

An inner peripheral surface of the outer cylinder cap portion 12 constituting the outer cylindrical body 10 has an equal diameter main inner peripheral surface portion 12a extending in an equal diameter direction in the direction along the ejection portion axis P, and an equal diameter shape thereof. A tapered converging inner peripheral surface portion 12b that is continuous with the front end of the main inner peripheral surface portion 12a and has a smaller diameter toward the front end side, and an isometric guide that extends from the front end of the converging inner peripheral surface portion 12b to an equal diameter. An inner peripheral surface portion 12c is provided.
That is, the inner peripheral surface on the front end side of the outer cylindrical body 10 extends from the front end of the converging inner peripheral surface portion 12b having a smaller diameter toward the front end side, and the same diameter from the front end of the inner peripheral surface portion for convergence. A guide inner peripheral surface portion 12c is provided.

As shown in FIG. 5, a large-diameter inner peripheral surface portion 22 a having a larger diameter than the tip end portion is formed at the rear end portion of the inner peripheral surface of the inner cylinder nozzle portion 22.
Further, the inner cylinder nozzle portion 22 is formed from the front end of the large isometric portion 22A having a substantially equal diameter in the direction along the ejection portion axis P on the outer peripheral surface and the inner peripheral surface, and from the tip of the large equal diameter portion 22A. Both the surface and the inner peripheral surface are configured to include a tapered portion 22B extending in a state where the diameter becomes smaller toward the distal end side, and a small equal diameter portion 22C extending from the distal end of the tapered portion 22B to an equal diameter.

  The plurality of communication holes 34 are formed in a staggered manner arranged in two rows in the direction along the ejection portion axis P at the insertion portion of the inner cylinder main body 21 into the outer cylinder main body 11. .

  As shown in FIGS. 5 and 8, a male screw portion 21 s is formed at the tip of the inner cylinder main body 21, and an inner cylinder is formed on the large-diameter inner peripheral surface portion 22 a of the inner cylinder nozzle portion 22. By forming a female screw portion 22 s that can be screwed into the male screw portion 21 s of the main body portion 21 and screwing the female screw portion 22 s of the inner cylinder nozzle portion 22 into the male screw portion 21 s of the inner cylinder main body portion 21, the inner cylinder The nozzle portion 22 is configured to be detachably connectable to the tip of the inner cylinder main body portion 21.

  As shown in FIGS. 4 to 8, the distribution ratio adjusting means S allows the gas fuel G to pass through the central jet passage 31 at a location downstream of the plurality of communication holes 34 in the gas fuel flow direction. An orifice plate 35 serving as a distribution ratio setting body having a passing hole 35a to be restricted is detachably provided.

  The distribution ratio adjusting means S will be described. As shown in FIGS. 5 and 8, the orifice plate 35 is a disc material that can be fitted into the large-diameter inner peripheral surface portion 22a of the inner cylinder nozzle portion 22. The inner cylinder nozzle portion is formed in a plate shape by drilling one passage hole 35a, and the orifice plate 35 is fitted in the large-diameter inner peripheral surface portion 22a of the inner cylinder nozzle portion 22. 22, the internal thread portion 22 s of the inner cylinder main body portion 21 is engaged with the male screw portion 21 s of the inner cylinder main body portion 21 so that the orifice plate 35 is stepped on the inner peripheral surface of the inner cylinder nozzle portion 22 and the tip surface of the inner cylinder main body portion 21 The inner cylindrical body 20 is held so as to be held between the two.

  That is, the orifice plate 35 gives resistance to the gas fuel G flowing through the central jet passage 31 and a part of the gas fuel G supplied from the fuel supply passage 33 and flowing through the central jet passage 31 is supplied to the gas. The gas fuel G supplied to the central jet passage 31 by the fuel supply passage 33 is distributed to the peripheral jet passage 32 by passing through the plurality of communication holes 34 and flowing into the peripheral jet passage 32. It is.

  The gas fuel distribution ratio from the central ejection path 31 to the surrounding ejection path 32 is set according to the size of the passage hole 35a of the orifice plate 35. Therefore, as the orifice plate 35, the passage hole 35a A plurality of orifice plates 35 having different areas are prepared, and the gas flowing through the central ejection passage 31 is changed by changing the orifice plate 35 held in the inner cylindrical body 20 to one having a different area of the passage hole 35a. The flow resistance of the fuel G is changed to change the gas fuel distribution ratio from the central ejection path 31 to the surrounding ejection path 32.

Furthermore, as shown in FIGS. 4, 5, and 7, a plurality of blade bodies 36w are attached to the outer peripheral surface of the inner cylinder nozzle portion 22 by welding in a state of being spaced apart in the circumferential direction. A plurality of blades 36w constitute a swirl vane 36 as a swiveling means for swirling the gas fuel ejected from the surrounding ejection path 32.
Each of the blade bodies 36w of the swirl blade 36 is inclined to one side in the circumferential direction with respect to the axial center of the inner cylinder nozzle part 22, that is, the ejection part axis P, as viewed in the radial direction of the inner cylinder nozzle part 22. The gas fuel G ejected from the surrounding ejection path 32 is swirled.

  Incidentally, an angle at which the blade body 36w is inclined with respect to the ejection portion axis P (hereinafter sometimes referred to as a turning angle) in the radial direction of the inner cylinder nozzle portion 22 is, for example, 15 ° to 45 °. Set to the range.

  And the inner cylinder nozzle part 22 of the state which fitted the said orifice plate 35 in the large diameter inner peripheral surface part 22a is attached to the front-end | tip of the said inner cylinder main-body part 21 of the said fuel injection part main body Bm, and fuel injection-part main body Bm When the outer cylinder cap 12 is attached to the distal end of the outer cylinder body 11, the outer cylindrical body 10 and the inner cylindrical body 20 are connected to the outer cylindrical body 10 at the distal end of the inner cylindrical body 20, as described above. It is provided coaxially with the ejection portion axis P in a state protruding from the tip, and a central ejection path 31 is formed in the cylinder of the inner cylindrical body 20, and the inner cylindrical body 20 and the outer cylindrical body are formed. 10 is formed with a swirl vane 36 for swirling the gas fuel G ejected from the peripheral jet path 20 in the annular peripheral jet path 20, and the distribution The orifice plate 35 as the ratio adjusting means S is assembled to the fuel ejection part B. To become.

  And the opening part of the front-end | tip of the inner cylindrical body 20 turns into the central ejection port 31n from which the gaseous fuel is ejected from the central ejection path 31, and the outer periphery of the front-end | tip of the inner cylindrical body 20 and the inner periphery of the outer cylindrical body 10 The surface forms an annular peripheral jet 32 n through which gas fuel is jetted from the annular peripheral jet passage 32.

  Further, the tapered inner peripheral surface portion 12b, which has an inner peripheral surface of the protruding portion from the inner cylindrical member 20 in the outer cylindrical member 10, the diameter of which becomes smaller toward the tip side, and the inner peripheral surface portion for the converging thereof. The guide inner peripheral surface portion 12c having the same diameter and extending from the tip of 12b is provided.

  And when changing the gas fuel distribution ratio from the central ejection path 31 to the surrounding ejection path 32, the said outer cylinder cap part 12 is removed from the outer cylinder main-body part 11 of fuel injection-part main body Bm, Then, an inner cylinder nozzle The part 22 is removed from the inner cylinder main body 21 of the fuel ejection main body Bm. Then, the orifice plate 35 is replaced with one having a different area of the passage hole 35a, the orifice plate 35 is fitted into the large-diameter inner peripheral surface portion 22a of the inner cylinder nozzle portion 22, and the inner cylinder nozzle portion 22 is again inserted. It attaches to the front-end | tip of the said inner cylinder main-body part 21 of the said fuel injection part main body Bm, and also attaches the outer cylinder cap part 12 to the front-end | tip of the outer cylinder main-body part 11 of the fuel injection part main body Bm again.

  Incidentally, by changing the orifice plate 35 to one having a different area of the passage hole 35a, the gas fuel distribution ratio from the central jet passage 31 to the peripheral jet passage 32 is changed, and the gas fuel jet from the central jet passage 31 is changed. The ratio between the amount and the amount of gas fuel ejected from the surrounding ejection path 32 is changed, for example, in the range of 1:10 to 5: 5.

Next, the combustion form by the combustion apparatus comprised as mentioned above is demonstrated.
As shown in FIG. 5, the gas fuel G supplied from the fuel supply path 33 to the central ejection path 31 is distributed by the orifice plate 35 to the surrounding ejection paths 32 through the plurality of communication holes 34 at a predetermined distribution ratio. The gas fuel G flowing through the central ejection path 31 is made to travel straight in a small-diameter portion 22C extending from the tip of the tapered portion 22B in a state where the flow rate is increased in the tapered portion 22B. The gas fuel G, which is jetted in a straight line from the central jet port 31n in the jet portion axial direction and flows through the annular peripheral jet passage 32, is swung by the swirling action by the swirl vanes 36, The gas fuel G ejected from the ejection port 31n is ejected from the annular ambient ejection port 32n so as to cover the periphery of the gas fuel G.

  The gas fuel G ejected in such a state that it swirls from the annular peripheral ejection port 32n covers the gas fuel G ejected in a straight line from the central ejection port 31n in the direction of the ejection portion axis. After the flow velocity is increased at the tapered inner peripheral surface portion 12b on the inner peripheral surface on the front end side of the cylindrical body 10, the same diameter shape extends from the front end of the inner peripheral surface portion 12b for converging. The gas fuel G is ejected from the outer cylindrical body 10 so as to advance in the axial direction of the ejection portion while turning by the guidance by the guide inner peripheral surface portion 12c, so that the ejection direction of the gas fuel G from the fuel ejection portion B is stable. Erupted.

  Then, as shown in FIG. 3, combustion air A is supplied from the air port 5 to the combustion region of the gas fuel G ejected from the fuel ejection part B in a state in which the ejection direction is stable, and the gas fuel G is combusted. Therefore, it is possible to form a strong flame F that is difficult to be beaten by the atmosphere in the furnace 7.

Further, since the gas fuel G is ejected from the annular peripheral ejection path 32 in a swirling state, the width of the flame F can be widened.
Further, by covering the periphery of the gas fuel G ejected from the central ejection path 31 with the swirling gas fuel flow G ejected from the surrounding ejection path 32, the gas fuel G ejected from the central ejection path 31 and Since the contact with the combustion air A can be further suppressed, the carbon particles can be burned while being efficiently generated, and the generation rate of the bright flame can be further improved.

  Then, by replacing the orifice plate 35 provided in the fuel ejection part B with one having a different area of the passage hole 35a, the amount of gas fuel ejected from the central ejection path 31 and the gas fuel ejection from the surrounding ejection path 32 By adjusting the ratio to the amount, the shape of the flame F can be changed as shown by the solid line and the alternate long and short dash line in FIGS.

  When the ratio of the amount of gas fuel ejected from the central ejection path 31 and the amount of gas fuel ejection from the surrounding ejection path 32 is changed so that the ratio of the amount of gas fuel ejection from the central ejection path 31 is reduced, the flame F The shape can be changed from, for example, the shape shown by the solid line in FIGS. 1 to 3 to the shape shown by the one-dot chain line in FIGS. 1 to 3 by increasing the length and reducing the width. .

[Second Embodiment]
Hereinafter, the second embodiment of the present invention will be described. In the second embodiment, except that the configuration of the fuel ejection portion B is different, the configuration is the same as that of the first embodiment. The configuration of B will be described.

  As shown in FIG. 9, in the second embodiment, as in the first embodiment, the fuel ejection portion B is replaced by the outer cylindrical body 10 and the inner cylindrical body 20, and the outer cylindrical body 10. Although the tip is configured so as to protrude from the tip of the inner cylindrical body 20, the inner peripheral surface on the tip side of the outer cylindrical body 10 has a tapered converging shape with a smaller diameter toward the tip side. The inner peripheral surface portion 12b and a guide widening inner peripheral surface portion 12d extending in a widening shape with a larger diameter from the tip to the tip end side of the inner peripheral surface portion 12b for convergence are configured.

  Similarly to the first embodiment, the inner cylindrical body 20 includes a large-diameter portion 22A, a tapered portion 22B extending from the tip of the large-diameter portion 22A, and a tip of the tapered portion 22B. The inner cylindrical body 20 is configured to have a small inner diameter portion 22C that extends, the tip of the inner cylindrical body 20 is positioned at the guiding inner peripheral surface portion 12d in the outer cylindrical body 10, and The distance between the outer peripheral surface of the tapered portion 22B of the cylindrical body 20 and the inner peripheral surface portion 12b for convergence of the outer cylindrical body 10 is equal to the outer peripheral surface of the large-diameter portion 22A of the inner cylindrical body 20 and the outer cylindrical body. By providing the outer cylindrical body 10 so as to be narrower than the interval between the ten equal-diameter main inner peripheral surface portions 12a, the tapered inner peripheral surface portion 12b of the outer cylindrical body 10 is provided. The converging action of the gas fuel G is configured to be strong.

  Accordingly, the gas fuel G flowing through the annular peripheral ejection path 32 is formed between the outer peripheral surface of the tapered portion 22B of the inner cylindrical body 20 and the inner peripheral surface portion 12b for convergence of the outer cylindrical body 10. In a state where the flow velocity is effectively increased in the tapered annular flow path portion, the jet is spouted in a state of swirling from the annular peripheral jet port 32n, and further, the outer tubular body 10 is further widened. By the guide of the guide inner peripheral surface portion 12d, it is ejected from the outer cylindrical body 10 in a state of swirling in a broadening manner, so that a flame having a short and wide shape and a strong flame is formed. Can do.

[Another embodiment]
Next, another embodiment will be described.
(B) In addition to the side port type glass melting furnace exemplified in the above embodiment, the combustion apparatus of the present invention is also applicable to a so-called end port type glass melting furnace as shown in FIGS. Can 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 air ports 5 are formed in the furnace wall 4 so as to correspond to the respective heat storage chambers 3. 3 and each air port 5 are communicated with each other through an air supply path 6.
A fuel ejection portion mounting hole 4s is 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 fuel ejection portion mounting hole 4s is provided with the first embodiment. The same fuel ejection part B as that of the first embodiment is provided, and the left and right fuel ejection parts B are used to perform alternating combustion.

A glass raw material inlet 4i is provided at the end of the furnace wall 4 that forms the side surface adjacent to one of the side surfaces provided with the fuel injection portion B, and the side surface where the fuel injection portion B is provided. 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 on which the fuel ejection portion 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 distribution ratio adjusting means S is provided with a passage hole that restricts the passage of the gas fuel G at a location downstream of the plurality of communication holes 34 in the central jet passage 31 in the gas fuel flow direction. In the case where the ratio setting body is provided, the distribution ratio setting body is not limited to the plate-like orifice plate 35 having one passage hole 35a as exemplified in the above embodiments. For example, a porous plate or a cylindrical body may be used.

( C ) As an arrangement form of the outer cylindrical body 10 and the inner cylindrical body 20, the arrangement form exemplified in the above embodiment, that is, the distal end of the outer cylindrical body 10 is more than the distal end of the inner cylindrical body 20. Is not limited to the projecting arrangement form, and the arrangement form in which the distal end of the outer tubular body 10 and the distal end of the inner tubular body 20 are located at the same position in the jet axis direction, or the outer tubular body 10. An arrangement configuration in which the tip of the inner cylinder 20 recedes from the tip of the inner cylindrical body 20 may be employed.

( D ) A plurality of swirl blades 36 having different swivel angles are prepared as the inner tube nozzle part 22 that can be replaced at the tip of the inner cylinder main body 21, and the swirl blade 36 is replaced by replacing the inner cylinder nozzle part 22. You may comprise so that the turning angle of can be changed. In this case, by changing the swirl angle of the swirl vane 36, the extent of the gas fuel ejected from the fuel ejection part B can be varied, and the width and length of the flame can be varied.

( E ) In the above embodiment, the swirl vane 36 may be omitted.

( 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 ) In addition to the glass melting furnace exemplified in each of the above embodiments and the glass melting furnace exemplified in another embodiment shown in FIG. 10 and FIG. Can be applied.

A longitudinal sectional view of a glass melting furnace provided with a combustion apparatus for a heating furnace according to an embodiment Fig. 1 arrow view The longitudinal cross-sectional view of the principal part of the glass melting furnace which provided the combustion apparatus for heating furnaces concerning embodiment The longitudinal cross-sectional view of the fuel injection part of the combustion apparatus for heating furnaces which concerns on 1st Embodiment The longitudinal cross-sectional view of the principal part of the fuel injection part of the combustion apparatus for heating furnaces which concerns on 1st Embodiment Figure 5 Haha arrow view of FIG. The longitudinal cross-sectional view of the principal part of the fuel injection part of the combustion apparatus for heating furnaces which concerns on 1st Embodiment The longitudinal cross-sectional view of the principal part of the fuel injection part of the combustion apparatus for heating furnaces concerning 2nd Embodiment Vertical sectional view of a glass melting furnace according to another embodiment FIG. 10 is a view of the knee arrow.

Explanation of symbols

5 Oxygen-containing gas supply port 6 Oxygen-containing gas supply unit 7 In-furnace 10 Outer cylindrical body 12b Converging inner peripheral surface portion 12c, 12d Guiding inner peripheral surface portion 20 Inner cylindrical body
22A Large diameter part
22B Tapered part
22C Small equal diameter part 31 Central ejection path 31n Central ejection port 32 Peripheral ejection path 33 Fuel supply part 34 Communication part, Communication hole 35 Distribution ratio setting body 35a Passing hole 36 Turning means B Fuel ejection part S Distribution ratio adjustment means

Claims (3)

A fuel ejection section for ejecting gas fuel into the furnace;
Oxygen-containing gas supply for supplying a combustion oxygen-containing gas to a combustion area of gas fuel ejected from the fuel ejection section from an oxygen-containing gas supply port provided at a location different from the gas fuel ejection location of the fuel ejection section Are provided,
The fuel ejection portion includes an outer cylindrical body and an inner cylindrical body coaxially, forms a central ejection path in the cylinder of the inner cylindrical body, and the inner cylindrical body and the outer cylinder. A combustion apparatus for a heating furnace configured to form an annular peripheral ejection path between the cylindrical body and
A fuel supply section for supplying gas fuel to the fuel ejection section is provided to supply gas fuel to the central ejection path;
The fuel ejection part is configured to supply a part of the gas fuel supplied to the central ejection path to the ambient ejection path through a communication part that communicates the central ejection path and the surrounding ejection path.
Distribution ratio adjusting means for adjusting a distribution ratio for distributing the gas fuel supplied to the central ejection path to the surrounding ejection path through the communication part is provided in the fuel ejection part,
The distribution ratio adjusting means passes the gas fuel at a location upstream of the central jet outlet at the tip thereof in the central jet passage and upstream of the communication portion in the gas fuel flow direction. is constructed by detachably attached to the distribution ratio setting member provided with a passage hole to limit,
The inner peripheral surface of the portion on the tip side of the inner cylindrical body where the distribution ratio setting body is provided is a large isometric portion having a substantially equal diameter in a direction along the axis of the inner cylindrical body. A tapered portion extending from the tip of the large isometric portion to the outer peripheral surface and the inner peripheral surface with a smaller diameter toward the tip side, and a small isometric portion extending from the tip of the tapered portion to the same diameter. Combustion device for a heating furnace composed of   The combustion apparatus for a heating furnace according to claim 1, wherein a swirling means for swirling the gas fuel ejected from the peripheral jet passage is provided in the peripheral jet passage. The fuel ejection portion is configured to include the outer cylindrical body and the inner cylindrical body in a state in which a distal end of the outer cylindrical body protrudes from a distal end of the inner cylindrical body,
The inner peripheral surface on the front end side of the outer cylindrical body has a tapered converging inner peripheral surface portion having a smaller diameter toward the front end side, and extends from the front end of the inner peripheral surface portion for converging to the same diameter or toward the front end side. The combustion apparatus for a heating furnace according to claim 1 or 2, comprising a guide inner peripheral surface portion extending in a divergent shape having a large diameter .

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