JP2009243853A - Combustion device for heating furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device for a heating furnace, appropriately realizing cleanness and high efficiency of combustion gas, in the case where it is used for changing a combustion device for an oil-type heating furnace, for example. <P>SOLUTION: A peripheral wall part at an leading end side of a fuel ejection body B and facing the inside of the furnace is provided with a gas fuel ejecting nozzle 9 comprising a plurality of ejection holes 9a for ejecting gas fuel supplied from a gas fuel flow passage 20 toward the inside of the furnace in a state of being aligned to a supply passage width direction of an oxygen containing gas supply passage. The gas fuel ejecting nozzle 9 is composed to eject the gas fuel so as to form a flame whose flame formation range is spread more extensively on one side than on the other side in the supply passage width direction, which forms a fan-shaped flame with its flame formation range spreading in the supply passage width direction. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention provides a gas fuel flow path for allowing gas fuel to flow from the base end side toward the tip end side, and a long fuel jetting body in a posture along the vertical direction that is provided along the vertical direction. From the gas combustion flow path to the peripheral wall portion on the tip side of the fuel jetting body and facing the furnace. There is provided a gas fuel injection nozzle provided with a plurality of injection holes for injecting supplied gas fuel toward the inside of the furnace in a state in which the oxygen-containing gas supply path is arranged in the width direction of the supply path. The present invention relates to a combustion apparatus for a heating furnace configured to form a flame having a fan shape extending in a lateral width direction.

Such a combustion apparatus for a heating furnace (hereinafter sometimes simply referred to as a combustion apparatus) is provided with a fuel ejection body in a state of entering into an oxygen-containing gas supply path, and gas is emitted from a gas fuel ejection nozzle of the fuel ejection body. It is configured to form a flame in which the fuel is ejected toward the inside of the furnace and the flame forming range expands in the width direction of the supply path, for example, a fan shape above the melting layer that dissolves the glass raw material The flame is formed and the melting tank is heated.
In such a combustion apparatus for a heating furnace, conventionally, the gas fuel injection nozzle forms a flame in which the flame formation range is expanded in the same manner on one side and the other side in the supply passage width direction. It was comprised in the state which ejects gas fuel to (for example, refer patent document 1).

JP-A-11-346174

  In recent years, in order to reduce CO2 and the like, a combustion apparatus for an oil-type heating furnace in which oil fuel is ejected toward the inside of the furnace by a fuel ejection body provided with an oil fuel ejection nozzle is used as a gas fuel ejection nozzle. May be changed to a combustion apparatus for a gas-type heating furnace in which gas fuel is ejected toward the inside of the furnace with a fuel ejection body provided with an oil-type heating furnace. When changing to a combustion furnace for a heating furnace, a hole is formed in the bottom wall portion of the oxygen-containing gas supply path to allow an oil-type fuel jet to enter. A fuel jet for gas type is provided.

In other words, in the combustion apparatus for an oil-type heating furnace, a position where the fuel ejector is biased to one side with respect to the oxygen-containing gas supply path and a position biased to the other side with respect to the central position in the lateral direction of the feed path. In the case where each is provided, since two holes are formed in the bottom wall portion of the oxygen-containing gas supply path to allow the oil-type fuel jets to enter. When changing to the combustion apparatus, a fuel jet body provided with a gas fuel jet nozzle is provided in each of the two holes formed, and as shown in FIG. 19, from each of the two fuel jet bodies. The gas fuel is ejected and changed to a combustion apparatus for a gas-type heating furnace.
Incidentally, in a combustion apparatus for a gas-type heating furnace in which gas fuel is ejected from each of two fuel ejection bodies, one side and the other side of the oxygen-containing gas supply path from the center position in the lateral direction of the supply path. In each of the above, a flame is formed that has a fan shape in which the flame formation range extends in the width direction of the supply path.

  By the way, in a combustion apparatus for a heating furnace, it is desired to improve the cleanliness of combustion gas and the improvement in efficiency while forming a flame of an appropriate length for heating the object to be heated. As described above, when a conventional combustion apparatus for a heating furnace is used to change a combustion apparatus for an oil-type heating furnace, it may be difficult to accurately improve combustion gas cleaning and efficiency. Improvement is desired.

  The present invention has been made in view of the above circumstances, and its purpose is to accurately clean and improve the efficiency of combustion gas when used for changing a combustion apparatus for an oil-type heating furnace. It is in providing a combustion apparatus for a heating furnace that can be achieved.

A combustion apparatus for a heating furnace according to the present invention has a long fuel jet body in a posture along a vertical direction provided with a gas fuel flow path for allowing gas fuel to flow from the base end side toward the tip end side. A peripheral wall portion that is provided in a state of being rushed into an oxygen-containing gas supply path for supplying combustion oxygen-containing gas into the furnace through a supply port of the heating furnace side wall portion, and is opposed to the furnace at the front end side of the fuel ejection body In addition, a gas fuel injection nozzle is provided that includes a plurality of injection holes for injecting the gas fuel supplied from the gas fuel flow channel toward the inside of the furnace in a state in which the supply holes in the oxygen-containing gas supply channel are arranged in the lateral width direction. The flame forming range is configured to form a fan-shaped flame extending in the width direction of the supply path, and the first characteristic configuration is
The gas fuel injection nozzle is configured to inject fuel so that the flame formation range forms a flame in which one side in the lateral direction of the supply path is larger than the other side.

That is, since the gas fuel injection nozzle is configured in a state in which the gas fuel is ejected so as to form a flame in which the flame formation range expands on one side in the supply passage width direction more than the other side, It is possible to form a flame in which the range is a fan shape in which one side in the lateral direction of the supply path is wider than the other side.
And when using it for the change of the combustion apparatus for oil-type heating furnaces, for example, the fuel jet is provided at a position that is biased to one of the center positions in the width direction of the supply path of the oxygen-containing gas supply path. In this case, in the fuel jet body, the side where the fuel jet body is not provided is one side, the side where the fuel jet body is provided is the other side, and the flame forming range is one side in the lateral direction of the supply path. By forming a flame that expands more greatly, an appropriate flame can be formed for the oxygen-containing gas supply path.
Thus, in the case where one fuel jet is provided at a position deviated to one side from the central position in the supply passage width direction of the oxygen-containing gas supply passage, the central position in the supply passage width direction of the oxygen-containing gas supply passage is provided. Compared to the case where fuel jets are provided on both sides, the gas fuel supplied separately into two fuel jets can be gathered and supplied to a single fuel jet, thus broadening the flame. In addition, since the jet speed of the gas fuel can be slowed while the flame length is the same length, the combustion gas can be cleaned and the efficiency can be improved accurately.
In other words, in the case where one fuel jet is provided at a position biased to one side from the central position in the supply passage width direction of the oxygen-containing gas supply passage, the central position in the supply passage width direction of the oxygen-containing gas supply passage As shown in FIG. 18, the flame length is the same as shown in FIG. 18, and as shown in FIG. 14, FIG. 16 and FIG. Although the temperature distribution is the same, slow combustion is achieved by slowing down the gas fuel injection speed, so that the temperature of the flue can be lowered and the efficiency can be improved as shown in FIG. As shown in FIG. 19, it was also found from the experimental results that the amount of NO emission can be reduced to clean the combustion gas. The contents of this experiment will be described later.

Therefore, since the gas fuel injection nozzle is configured to inject gas fuel so as to form a flame in which the flame formation range is in a state in which one side in the lateral direction of the supply path is larger than the other side, the oil type In the case where the combustion apparatus for a heating furnace is used, for example, an oxygen-containing gas supply path is provided with a single fuel jet at a position biased to one side from the center position in the lateral width direction of the supply path. While forming an appropriate flame for the contained gas supply path, that is, forming a flame of an appropriate length for heating an object to be heated, the combustion gas can be cleaned and the efficiency can be improved. It becomes possible.
Accordingly, it is possible to provide a combustion apparatus for a heating furnace capable of accurately purifying combustion gas and improving efficiency when used for changing a combustion apparatus for an oil-type heating furnace. It came.

  A second characteristic configuration of a combustion apparatus for a heating furnace according to the present invention is that, in the first characteristic configuration, a plurality of ejection holes in the gas fuel ejection nozzle are formed radially.

That is, since the plurality of ejection holes in the gas fuel ejection nozzle are formed radially, gas fuel can be ejected toward the inside of the furnace over the entire flame formation range, so that the entire flame formation range It is easy to form a flame that burns in a uniform state.
Accordingly, it has become possible to provide a combustion apparatus for a heating furnace that easily forms a flame that burns in a uniform state over the entire flame formation range.

  A combustion apparatus for a heating furnace according to a third aspect of the present invention is the combustion apparatus for a heating furnace according to the second aspect, wherein the gas fuel injection nozzle is formed in an arcuate body having an outer peripheral surface and an inner peripheral surface that are concentric arcs. It is in the point.

That is, since the gas fuel injection nozzle is formed in an arcuate body in which each of the outer peripheral surface and the inner peripheral surface is a concentric arc shape, the gas fuel injection nozzle has an amount of protrusion from the outer peripheral surface of the fuel jet body. It is possible to improve the durability of the gas fuel injection nozzle by preventing overheating of the gas fuel injection nozzle by minimizing it as much as possible or preventing it from projecting from the outer peripheral surface of the fuel injection body. By equalizing the length, it is possible to make the resistance of the ejection holes uniform, and it becomes easy to burn in a more uniform state over the entire flame formation range.
Accordingly, it has become possible to provide a combustion apparatus for a heating furnace that improves the durability of the gas fuel nozzle and facilitates combustion in a more uniform state over the entire flame formation range.

  A combustion apparatus for a heating furnace according to a fourth aspect of the present invention is the combustion apparatus for a heating furnace according to the third aspect, wherein the gas fuel ejection nozzle is mounted in a state of being symmetrical with respect to the fuel ejection body, and the plurality of ejections The holes are formed in a radial shape centering on a position that is biased to the side opposite to the side that greatly expands the flame forming range, rather than the center position of the fuel jet body in the lateral direction of the supply path.

That is, the gas fuel ejection nozzle is mounted in a state of being symmetrical with respect to the fuel ejection body, and the plurality of ejection holes of the gas fuel ejection nozzle thus mounted are arranged in the center in the lateral direction of the supply path of the fuel ejection body. It is formed in a radial shape centered on the position opposite to the side that greatly expands the flame formation range than the position, so the gas fuel injection nozzle is connected to the other side with the flame formation direction on the other side of the supply passage width direction. The gas fuel can be ejected so as to form a flame that expands more than the side.
That is, in general, the fuel injector is configured so that the gas fuel injection nozzle is mounted in a bilaterally symmetric state, and therefore, the plurality of injection holes are arranged from the center position in the lateral direction of the supply passage of the fuel injector. However, by forming the gas fuel injection nozzle radially, centering on a position that is biased to the side opposite to the side that greatly expands the flame formation range, the flame formation range is set so that one side in the width direction of the supply path is more than the other side. The gas fuel can be ejected so as to form a flame that expands greatly.
Therefore, in the case where the combustion apparatus for the oil type heating furnace is changed and used, the fuel ejection body provided with the gas fuel ejection nozzle is attached while utilizing the mounting configuration of the combustion apparatus for the oil type heating furnace. It has become possible to provide a combustion apparatus for a heating furnace that can be used more conveniently.

  A combustion apparatus for a heating furnace according to a fifth aspect of the present invention is the combustion apparatus for a heating furnace according to any one of the first to fourth characteristic structures, wherein the fuel ejection body is in the supply path with respect to the oxygen-containing gas supply path. It exists in the point provided in the position biased to the opposite side to the side which expands the said flame formation range largely rather than the center position of a width direction.

That is, since the fuel jet body is provided at a position that is biased to the side opposite to the side that greatly expands the flame formation range with respect to the oxygen-containing gas supply path, rather than the center position in the supply path lateral width direction. Since the flame can be formed in such a state that the central position side of the oxygen-containing gas supply path in the width direction of the supply path is wider than the other side, a flame suitable for the oxygen-containing gas supply path is formed. Can do.
Accordingly, when a combustion apparatus for an oil-type heating furnace is changed and used, a combustion apparatus for a heating furnace capable of forming a flame suitable for the oxygen-containing gas supply path can be provided. It came.

Hereinafter, based on the drawings, an embodiment in which the present invention is applied to a combustion apparatus for a glass melting furnace, which is an example of a combustion apparatus for a heating furnace, will be described.
As shown in FIGS. 6 and 7, the glass melting furnace is provided with a melting tank 2 at the bottom and a furnace body 1 having an arched ceiling at the center, and a glass raw material is charged from one end of the melting tank 2, The molten glass is taken out from the other end, the heat storage chambers 3 are extended along the raw material transfer direction T on the left and right sides of the furnace main body 1 with respect to the glass raw material transfer direction T, and the furnace main body 1 is melted. Four air ports (so-called ports, which correspond to supply ports) 5 are arranged in parallel along the raw material transfer direction T in the upper part of the left and right furnace walls 4 as the furnace side walls, and the heat storage chamber 3 and each air The port 5 is communicated with an air supply path 6 so as to be a so-called side port type.
The air supply path 6 is configured to supply combustion air as combustion oxygen-containing gas into the furnace 7 through the air ports 5 of the left and right furnace walls 4 and corresponds to an oxygen-containing gas supply path.

Next, description is added about a glass melting furnace.
An inlet 4 i is formed in the furnace wall 4 of the furnace body 1, a work tank 8 is provided outside the furnace wall 4 facing the furnace wall 4 where the inlet 4 i is formed, and the work tank 8 communicates with the melting tank 2. An extraction hole 4e to be formed is formed in the furnace wall 4, and the glass raw material charged from the charging port 4i is melted in the melting tank 2 to flow toward the working tank 8, and clean molten glass is passed through the extraction hole 4e. It is configured to be guided to the work tank 8.

  As shown in FIG. 6, a long-sized fuel ejection body B having a cylindrical cross-sectional shape having a gas fuel ejection nozzle 9 for ejecting the gas fuel G toward the inside 7 of the furnace on the tip side is provided in the furnace. For each of the four air supply paths 6 provided on the right side of the main body 1 and the four air supply paths 6 provided on the left side, it is provided in a state of protruding into the inside from the lower side to the inside, The so-called through-port type is used.

  The fuel ejector B on the left side and the fuel ejector B on the right side alternately repeat the ejection of the gas fuel G and stop the ejection every certain time (for example, about 15 to 30 minutes), and eject the gas fuel G. 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 fuel ejector B side, and the gas fuel G The combustion gas E in the furnace 7 is discharged from the air outlet 5 on the side of the fuel jet B that has stopped jetting, and the fuel jet B on the right side and the fuel jet B on the left side burn alternately. The so-called alternating combustion is performed. 6 and 7 show a state in which the fuel jet B on the left side is burning.

Around the gas fuel G ejected from the gas fuel ejection nozzle 9 of the fuel ejection body B, from the air port 5 provided with the fuel ejection body B ejecting the gas fuel G along the ejection direction. Combustion air A is supplied, and gaseous fuel G and combustion air A come into contact and diffusely burn, so-called slow combustion, and a high-intensity flame (luminous flame) F is formed. The glass raw material in the melting tank 2 is melted by radiant heat. The arched ceiling of the furnace body 1 reflects the radiant heat of the flame F.
The combustion gas E in the furnace 7 flows into the heat storage chamber 3 from the air port 5 on the side of the fuel jet B where the ejection 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.
The fuel ejection body B is formed in a long shape having a gas fuel flow path 20 for allowing the gas fuel G to flow from the base end side toward the front end side, and the front end side in the air supply path 6. It is provided in a state of rushing.
A plurality of ejection holes 9a for ejecting the gas fuel G supplied from the gas fuel flow path 20 toward the inside of the furnace 7 on the peripheral wall portion facing the inside of the furnace 7 on the front end side of the fuel ejection body B. Are arranged so as to be arranged in the width direction of the supply path in the air supply path 6, and the flame formation range is configured to form a fan-shaped flame F extending in the width direction of the supply path. is there.

The fuel ejection body B is provided at a position that is offset from the air supply path 6 on the side opposite to the side that greatly expands the flame formation range from the center position in the supply path lateral width direction.
Specifically, out of the four air supply paths 6 arranged along the transfer direction T of the glass material, the first and third air supply paths 6 from the inlet 4 i side are connected to the air supply path 6. Thus, one fuel jet B is provided at a position deviated from the center position in the lateral direction of the supply passage toward the inlet 4i, and provided on the fuel jet B in the first and third air supply passages 6. The gas fuel injection nozzle 9 has a fan shape in which the discharge port 4e side is one side and the input port 4i side is the other side, and the flame formation range extends in the supply passage width direction as described above, and one side in the supply passage width direction is The gas fuel G is ejected so as to form a flame F that expands more than the other side.
Further, in the second and fourth air supply passages 6 from the inlet 4i side, the fuel ejection body B is placed at a position that is biased toward the take-out port 4e with respect to the air supply passage 6 from the center position in the lateral direction of the supply passage. One gas fuel injection nozzle 9 provided in the fuel injection body B in the second and fourth air supply passages 6 is provided on the one side on the inlet 4i side and on the other side on the outlet 4e side. The gas fuel G is jetted out so as to form a flame in which the flame forming range is widened from one side of the supply passage width direction to the other side.

  In other words, in the air supply path 6 (first and fourth air supply paths 6) adjacent to the furnace wall 4 that forms the inlet 4 i and the outlet 4 e, the fuel jet B is connected to the air supply path 6. On the other hand, a gas fuel injection nozzle 9 provided in the fuel injection body B in the air supply path 6 adjacent to the furnace wall 4 is provided at a position deviated to the furnace wall 4 side adjacent to the center position in the horizontal direction of the supply path. A flame F is formed in which the side away from the adjacent furnace wall 4 is one side, the adjacent furnace wall 4 side is the other side, and the flame formation range is larger than the other side in one side in the lateral direction of the supply path. Thus, the gas fuel G is ejected.

  The gas fuel ejection nozzle 9 is fitted in a nozzle fitting opening 10 formed on the distal end side of the side peripheral wall of the fuel ejection body B, and is ejected to eject the gas fuel G supplied from the gas fuel flow path 20. The hole 9a is formed between the front surface 9c on the gas fuel ejection side exposed from the nozzle fitting opening 10 and the rear surface 9d on the inner surface located inside the fuel ejection body B.

  Next, the fuel jet B will be described. The fuel jet B provided in the air supply path 6 closest to the inlet 4i of the four left air supply paths 6 and the other fuel jets B are: Since the left and right air supply paths 6 are configured to be the same or different from each other, the fuel ejection body B provided in the air supply path 6 on the most inlet side 4i side of the left four air supply paths 6 will be described. The description of the fuel jet body B will be omitted.

  As shown in FIGS. 1 to 4, the fuel ejection body B includes an outer cylindrical body 11 having a cylindrical cross section and an inner cylindrical body 12 shorter than the outer cylindrical body 11 arranged in a substantially coaxial core shape. 11 and the base end portion of the inner cylindrical body 12 are closed by the bottom plate 13, the tip of the inner cylindrical body 12 is retracted from the tip of the outer cylindrical body 11, and the tip of the outer cylindrical body 11 is hemispherically shaped. The cap 14 is closed. That is, the peripheral wall portion of the fuel ejection body B having a cylindrical cross section is composed of the outer cylinder body 11 and the inner cylinder body 12.

  Then, on the front end side of the fuel ejection body B, a notch extending approximately half in the circumferential direction is formed at the upper end portion of the inner cylinder body 12 and extending approximately half in the circumferential direction at a position spaced from the upper end of the outer cylinder body 11. A notch is formed, and an upper closing plate 15 positioned above the notched portion and a lower closed position positioned below the notched portion between the outer cylindrical body 11 and the inner cylindrical body 12 at the notched portion. The plate 16 is closed by a pair of side closing plates 17 located on both the left and right sides of the cutout portion, thereby forming a recessed portion that is recessed substantially half a circumference on the distal end side of the side peripheral wall of the fuel ejector B. The recessed portion is used as a nozzle fitting opening 10.

The upper closing plate 15 has a circular portion whose outer diameter is substantially the same as the outer diameter of the inner cylindrical body 12, an inner diameter that is substantially the same as the outer diameter of the inner cylindrical body 12, and an outer diameter that is substantially the same as the outer diameter of the outer cylindrical body 11. The upper closing plate 15 formed in a shape having the same arcuate portion and provided in a posture along the radial direction of the fuel ejection body B is used in the entire upper end opening of the inner cylinder 12 and in the notch portion. The space between the inner cylinder 12 and the outer cylinder 11 in the upper part is closed.
The lower closing plate 16 is formed in an arc shape whose inner diameter is substantially the same as the outer shape of the inner cylinder body 12 and whose outer diameter is substantially the same as the outer diameter of the outer cylinder body 11, and is along the radial direction of the fuel ejection body B. A lower closing plate 16 provided in a posture closes the space between the inner cylindrical body 12 and the outer cylindrical body 11 in the lower portion of the cutout portion.
The side closing plate 17 is formed in a rectangular shape and is provided with a pair of side closing plates 17 provided in a posture along the longitudinal direction of the fuel jet B. The space between the cylinder 12 and the outer cylinder 11 is closed.

  Further, nozzle mounting columns 18 in a posture along the longitudinal direction of the fuel jet B are attached to the plate surfaces of the left and right side closing plates 17 facing the inside of the furnace 7, and the nozzle mounting columns 18 are attached to the nozzle mounting columns 18. Is formed with a screw insertion hole 18b so as to penetrate in the lateral width direction.

  The upper closing plate 15, the lower closing plate 16, and the pair of nozzle mounting columns 18 constitute a mounting portion Bn of the nozzle 9 (hereinafter sometimes referred to as a nozzle mounting portion).

  As shown in FIGS. 3 and 4, the inside of the inner cylinder 12 is a gas fuel flow path 20 through which the gas fuel G flows from the base end side toward the tip end side, and the bottom plate 13 communicates with the fuel flow path 20. In this state, the gas fuel supply pipe 19 is connected, and the gas fuel G is supplied to the fuel flow path 20 through the gas fuel supply pipe 19.

  The closed space formed between the outer cylinder 11 and the inner cylinder 12 is used as a cooling jacket 21 through which cooling water flows, and the cooling water is communicated with the cooling jacket 21 below the outer cylinder 11. The supply pipe 22 is connected, and the cooling water is supplied to the cooling jacket 21 through the cooling water supply pipe 22, and the cooling water drain pipe 23 is connected to the upper end portion of the cap 14 in communication with the cooling jacket 21. The cooling water of the cooling jacket 21 is discharged through the cooling water drain pipe 23.

As shown in FIGS. 1 to 4, the front surface 9 c of the lower surface 9 f located on the upper side in the gas fuel flow direction of the gas fuel flow path 20 is inserted by inserting the gas fuel injection nozzle 9 into the nozzle fitting opening 10. A portion adjacent to the side is brought into contact with the lower closing plate 16, and an upper surface 9 e located on the lower side in the gas fuel flow direction is brought into contact with the upper closing plate 15, as viewed in the longitudinal direction of the fuel ejection body B The both end portions located on both end sides are configured to be fitted in the fuel ejection body B in contact with the nozzle mounting columns 18.
Further, the screw for fixing the gas fuel injection nozzle 9 is stopped by inserting a screw 25 for preventing the screw into the screw insertion hole 18b of each nozzle mounting column 18 and screwing it into the mounting plate 24 of the gas fuel injection nozzle 9. It is configured.

The gas fuel injection nozzle 9 is mounted such that the outer shape formed by the outer peripheral surface 9c, the inner peripheral surface 9d, and the like is symmetrical with respect to the fuel jet B, and the flame forming range is in the supply passage width direction. The gas fuel G is ejected so as to form a flame F that is in a state in which one side of the gas is larger than the other side.
Incidentally, the gas fuel ejection nozzle 9 is mounted on the fuel ejection body B as described above, so that the gas fuel ejection nozzle 9 is opposed to the air port 5 at the center in the circumferential direction of the outer peripheral surface 9c. In addition, the state in which the gas fuel injection nozzle 9 is symmetric with respect to the fuel injection body B is a state in which the gas fuel injection nozzle 9 is symmetric in the lateral direction of the supply path.

Next, the gas fuel injection nozzle 9 will be described with reference to FIGS.
The gas fuel injection nozzle 9 has an outer circumferential surface 9c of the gas fuel ejection nozzle 9 formed in an arc shape along the outer shape of the outer cylinder 11 (the outer circumferential surface of the fuel ejection body B) when viewed in the longitudinal direction of the fuel ejection body B. The inner peripheral surface 9d of the gas fuel injection nozzle 9 is formed in an arc shape along the outer shape of the inner cylinder 12 (the inner peripheral surface of the fuel jet body), and the outer peripheral surface 9c and the inner peripheral surface 9d are concentric arc shapes. It is formed in an arcuate body.
Further, the gas fuel injection nozzle 9 has an upper surface 9e and a lower surface 9f aligned in the longitudinal direction of the fuel ejector B formed in a planar shape parallel to each other and perpendicular to the outer peripheral surface 9c, and at both ends in the circumferential direction. The mounting plate 24 protrudes from the inner peripheral surface 9d of the gas fuel injection nozzle 9 so as to extend to the opposite side of the furnace 7 side.
Incidentally, the gas fuel ejection nozzle 9 has an outer peripheral surface 9c as an arc-shaped body that extends over a substantially half circumference in the circumferential direction of the fuel ejection body B.

As shown in FIG. 5, the five ejection holes 9a as the plurality of ejection holes 9a are arranged at a central position in the supply passage lateral direction of the fuel ejection body B (a central position in the lateral width direction of the gas fuel ejection nozzle 9). Rather, it is formed in a radial pattern centered on a position that is biased to the side opposite to the side that greatly expands the flame formation range.
Specifically, the gas fuel ejection nozzle 9 is formed with five ejection holes 9a radially in a state of being aligned in the circumferential direction of the fuel ejection body B, and these five ejection holes 9a are connected to the fuel ejection body. In the plan view of B, as the first to fifth ejection holes 9a in the clockwise order, the spread angle with the fourth ejection hole is 15 °, the fifth ejection hole is 15 °, and the third ejection hole is 18. 33 °, the second ejection hole is 36.66 °, the first ejection hole is 55 °, and the side opposite to the side that greatly expands the flame formation range than the central position in the lateral direction of the fuel ejection body B It is formed in a radial shape centering on the position biased to the center.
Further, the five ejection holes 9a formed radially are formed in two rows in the longitudinal direction of the fuel ejection body B, and the gas fuel ejection nozzle 9 is formed with a total of 10 ejection holes 9a. is there.

Incidentally, the 4th injection hole 9a is formed in the location biased to the opposite side to the side which expands a flame formation range largely rather than the center position of the horizontal direction in the gas fuel injection nozzle 9, and the plane of a fuel injection body It is formed in a posture along the longitudinal direction of the air supply path 6 as viewed.
Further, the first to third ejection holes 9 a and the fifth ejection hole 9 a are formed in a posture inclined with respect to the longitudinal direction of the air supply path 6 in a plan view of the fuel ejection body 9. The first to third ejection holes 9a are formed in a posture in which the opening on the outer peripheral surface 9c side is biased toward the side that greatly expands the flame formation range than the opening on the inner peripheral surface 9d side, No. 5 ejection hole 9a is formed in a posture in which the opening on the outer peripheral surface 9c side is shifted to the opposite side to the side that greatly expands the flame formation range than the opening on the inner peripheral surface 9d side.
In addition, the 3rd ejection hole 9a is formed in the center position of the horizontal width direction in the gas fuel ejection nozzle 9. FIG. Moreover, the 1st ejection hole 9a and the 2nd ejection hole 9a are mutually connected in the edge part by the side of the internal peripheral surface 9d.

The ejection direction of each ejection hole 9 a is configured to be perpendicular to the axis of the fuel ejection body B when viewed in the radial direction along the radial direction of the fuel ejection body B.
Each of the plurality of ejection holes 9a is formed so that the length of the hole is at least twice the diameter of the hole.

Next, the result of verifying the performance of the combustion apparatus for a heating furnace configured as described above will be described.
As shown in FIGS. 11 to 13, in the verification test, when the fuel ejection bodies B are provided on both sides of the center position in the lateral direction of the supply path as in the conventional case (referred to as two-combustion), A comparison was made with the case where one fuel jet B was provided at a position deviated to one side from the center position in the lateral direction of the supply path as in the above embodiment (referred to as single combustion).
The dimensions (outside dimensions) of the test furnace used for the verification test are 8.8 m in vertical width, 1.8 m in horizontal width, and 1.5 m in height along the jet direction of the gas fuel ejected from the fuel ejector B. is there. The combustion amount of the combustion device is 900 kW, the temperature of the combustion air after preheating is 1000 ° C., the oxygen concentration in the combustion gas is about 2.5%, the furnace pressure at a point 1.5 m from the floor is around 5 Pa, The length of the flame is around 3 m (see FIG. 17).
Although not shown in detail, the gas fuel injection nozzles for single combustion and double combustion are formed with five injection holes radially, and these five injection holes are formed in the longitudinal direction of the fuel injection body B. Three rows are formed in the direction, and a total of 15 ejection holes 9 a are formed in the gas fuel ejection nozzle 9.
The diameter of the single-combustion injection hole is set to 7 mm, the flame width angle is set to 50 °, the diameter of the two-combustion injection hole is set to 4 mm, and the flame angle is set to 10 °.

The test furnace includes a plurality of ceiling thermocouples 31 for measuring the temperature distribution at the center in the width direction on the ceiling, and a plurality of center thermocouples for measuring the temperature distribution at the center in the width direction on the floor. 32 and each of a plurality of thermocouples 33 on the right side of the floor surface for measuring the temperature distribution at a location that is biased to the side opposite to the side (right side) that greatly expands the flame formation range from the center in the width direction on the floor surface. Are provided along the vertical width direction.
In addition, a flue is formed in the ceiling on the side opposite to the side of the test furnace where the longitudinal air supply path 6 is provided, and in the flue, the combustion gas from the flue is collected. An outlet 34 is provided.
And the result of having measured the data after 28 minutes and 24 second have passed since the center temperature of the floor surface 2250mm away from the edge part inside a furnace of the air supply path 6 reached | attained 1000 degreeC is shown to FIGS. . Incidentally, FIG. 14 is a diagram showing the temperature distribution at the center in the width direction on the ceiling, FIG. 15 is a diagram showing the temperature of the combustion gas in the flue, and FIG. 16 is the temperature distribution at the center in the width direction on the floor. FIG. 17 is a diagram showing the temperature distribution at the right side of the center in the width direction on the floor, FIG. 18 is a diagram showing the flame length, and FIG. 19 is a diagram showing the NO amount of the combustion gas.

As shown in FIGS. 14, 16, and 17, when comparing the temperature distribution in the road, there is a significant difference between the single combustion and the double combustion at the boundary of about 2/3 of the flame length (about 2 m). It can be seen.
That is, in the single combustion, the temperature is higher on the side of the air supply path 6 than in the vicinity of 2/3 of the flame length (about 2 m), and the temperature is lower on the side opposite to the air supply path 6, As a result, as shown in FIG. 15, the temperature of the combustion gas in the flue could be reduced by about 20 ° C.
Further, as shown in FIG. 19, with respect to NO, the single combustion could be reduced by less than 10% compared with the double combustion. This is thought to be due to the fact that the single combustion is less likely to promote mixing of the combustion gas and the combustion air, and the heat spot of the flame is reduced, as compared to the double combustion.
Therefore, in the single combustion, the temperature of the flue combustion gas is reduced and NO is reduced as compared with the double combustion, so that a combustion apparatus for a heating furnace with high environment and efficiency can be obtained.

[Another embodiment]
(1) In the above-described embodiment, the plurality of ejection holes 9a in the gas fuel ejection nozzle 9 are formed in a radial shape. In addition to the radial shape, for example, the first to third ejection holes 9a are formed on the fuel ejection body B. It is formed in a posture inclined with respect to the longitudinal direction of the air supply path 6 in plan view, and the fourth to fifth ejection holes 9a are formed in the longitudinal direction of the air supply path 6 in plan view of the fuel ejection body B. For example, it may be formed in a posture other than the radial direction.

(2) In the above embodiment, the gas fuel injection nozzle 9 is formed in an arcuate body in which the outer peripheral surface 9c and the inner peripheral surface 9d are concentric arcs, but the outer peripheral surface 9c is formed in an arcuate shape. Further, the inner surface (inner peripheral surface 9d) may be formed in a semicircular body having a linear shape.

(3) In the above-described embodiment, the gas fuel injection nozzle 9 is mounted in a state that is bilaterally symmetric with respect to the fuel injection body B, that is, in a state in which the central portion in the circumferential direction of the outer peripheral surface 9c is closest to the furnace 7 However, the gas fuel ejection nozzle 9 is asymmetrical with respect to the fuel ejection body B, assuming that the location of the circumferential surface of the outer peripheral surface 9c that is biased in the circumferential direction is closest to the inside of the furnace 7. You may wear it.
In this case, the plurality of ejection holes 9a may be formed radially with the center position in the lateral width direction of the gas fuel ejection nozzle 9 as the center.

(4) In the above embodiment, the fuel ejector B is provided at a position that is biased to the side opposite to the side that greatly expands the flame formation range with respect to the air supply path 6 rather than the center position in the width direction of the supply path. However, the fuel ejector B may be provided at a position biased toward the side where the flame formation range is greatly expanded with respect to the air supply path 6 relative to the center position in the lateral direction of the supply path. The air supply path 6 may be provided at the center position in the lateral direction of the supply path.

(5) In the above embodiment, the present invention is applied to a side port type glass melting furnace, but as shown in FIGS. 8 and 9, it can also be applied to a so-called end port type glass melting furnace combustion apparatus. .
Hereinafter, the endport type glass melting furnace will be described.
Two 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 corresponding to the respective heat storage chambers 3. 3 and each air port 5 are communicated with each other through an air supply path 6, and a fuel jet B similar to that in the above embodiment is provided in each air supply path 6 in the same manner as in the above embodiment. The left and right fuel ejectors B are used to perform alternating combustion.
A glass raw material inlet 4i is provided at the end of the side of the fuel jet B in the furnace wall 4 that forms a side surface adjacent to the side provided with the fuel jet B, and faces the side provided with the fuel jet B. A work tank 8 is provided outside the furnace wall 4 forming the side surface, and a take-out hole 4e is formed in the furnace wall 4 between the work tank 8 and the melting tank 2 to allow the melting tank 2 and the working tank 8 to communicate with each other. It is.
That is, a glass raw material is introduced into the melting tank 2 from the inlet 4i, and the glass raw material is melted while flowing in a meandering manner toward the outlet hole 4e, and clean molten glass is operated through the outlet hole 4e. It is configured to lead to the tank 8.

(6) In the above embodiment, one fuel jet B is provided for each air supply path 6, but two or more fuel jets B may be provided for each air supply path 6.
That is, for example, when two fuel ejectors B are provided in each of the air supply passages 6, the fuel ejector B is arranged at the center in the supply passage lateral direction with respect to the air supply passage 6 as shown in FIG. 10. It is provided at each of a position biased to one side and a position biased to the other side of the position.

(7) In the above embodiment, the gas fuel injection nozzle 9 is provided with the five ejection holes 9a as the plurality of ejection holes 9a, but the gas fuel ejection nozzle 9 has two to four as the plurality of ejection holes 9a. The ejection holes 9a may be provided, and the gas fuel ejection nozzle 9 may be provided with six or more ejection holes 9a as the plurality of ejection holes 9a.

Exploded perspective view of main part of fuel jetting body in combustion apparatus for heating furnace The perspective view of the principal part of the fuel ejection body in the combustion apparatus for heating furnaces Longitudinal side view of fuel jet in combustion apparatus for heating furnace Cross-sectional view of fuel jet in combustion apparatus for heating furnace Plan view showing nozzle of combustion apparatus for heating furnace Longitudinal side view of a glass melting furnace equipped with a combustion device for a heating furnace VII-VII arrow view of FIG. Vertical sectional view of a glass melting furnace provided with a combustion apparatus for a heating furnace according to another embodiment IX-IX arrow view of FIG. Vertical section of a glass melting furnace provided with a combustion apparatus for a heating furnace according to another embodiment Longitudinal side view of test furnace Longitudinal side view of a test furnace with two fuel jets Longitudinal side view of a test furnace with a single fuel jet Diagram showing the temperature distribution at the center in the horizontal direction on the ceiling Diagram showing the temperature of the combustion gas in the flue Figure showing the temperature distribution at the center in the width direction on the floor Diagram showing temperature distribution on the right side of the floor in the width direction center Illustration showing flame length The figure which shows NO quantity of combustion gas Cross-sectional plan view for a glass furnace equipped with a combustion apparatus for a conventional heating furnace

Explanation of symbols

4 Heating furnace side wall part 5 Supply port 6 Oxygen-containing gas supply path 9 Gas fuel injection nozzle 9a Injection hole 20 Gas fuel flow path B Fuel injection body

Claims (5)

A long fuel jet is installed in the furnace through the supply port on the side wall of the heating furnace, with a gas fuel flow path that allows gas fuel to flow from the base end side toward the tip end side, and a posture along the vertical direction. Provided in a state of rushing into the oxygen-containing gas supply path for supplying the oxygen-containing gas for combustion,
Supplying in the oxygen-containing gas supply path a plurality of injection holes for injecting the gas fuel supplied from the gas fuel flow path toward the inside of the furnace on the tip side of the fuel spray body and facing the inside of the furnace A combustion apparatus for a heating furnace provided with gas fuel injection nozzles arranged in a state arranged in a width direction of a road, and configured to form a flame having a flame forming range extending in the width direction of the supply path. ,
For the heating furnace, the gas fuel ejection nozzle is configured to eject gas fuel so that the flame formation range forms a flame in which one side of the supply passage width direction is larger than the other side. Combustion equipment.   The combustion apparatus for a heating furnace according to claim 1, wherein the plurality of ejection holes in the gas fuel ejection nozzle are formed in a radial pattern.   The combustion apparatus for a heating furnace according to claim 2, wherein the gas fuel injection nozzle is formed in an arcuate body in which each of an outer peripheral surface and an inner peripheral surface is a concentric arc shape. The gas fuel ejection nozzle is mounted in a state of being symmetrical with respect to the fuel ejection body,
The plurality of ejection holes are formed in a radial shape centering on a position that is biased to a side opposite to a side that greatly expands the flame formation range, rather than a center position of the fuel ejection body in the lateral direction of the supply path. Item 4. A combustion apparatus for a heating furnace according to Item 3.   The fuel jet body is provided at a position that is biased toward a side opposite to a side that greatly expands the flame forming range with respect to the oxygen-containing gas supply path, rather than a central position in the width direction of the supply path. The combustion apparatus for a heating path according to any one of 1 to 4.

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