JPH05332515A - Combustion nozzle - Google Patents

Abstract

PURPOSE:To improve an overheating efficiency by a method wherein a discharging port of a combustion nozzle to which an injection passage for injecting fuel toward the discharging port is formed into a slit shape. CONSTITUTION:A burner head 7 is comprised of a burner cap 8, the first nozzle 9 and the second nozzle 10. The burner cap 8 and the first nozzle 9 are integrally assembled with the second nozzle 10. The first nozzle 9 is substantially formed into a cylindrical shape having its one end being closed. A slit-like discharging port 12 is formed at the closed wall part of the first cylindrical nozzle 9 and its opening end is connected to the second nozzle 10. Thus, an inner cylindrical hole of the first cylindrical nozzle 9 is made as a discharging chamber 11 and at the same time the slit-like discharging port 12 is opened at one side of the discharging chamber 11. With such an arrangement, a flame formed by fuel discharged from the slit-like discharging port becomes a fan-like flame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a discharge port which is opened on one side of a discharge chamber, and which is directed toward the discharge port on the side opposite to the opening side of the discharge port in the discharge chamber. TECHNICAL FIELD The present invention relates to a combustion nozzle to which an ejection passage for ejecting a fuel containing an atomized liquid fuel is connected.

[0002]

2. Description of the Related Art As such a combustion nozzle, there is, for example, a gas atomizer burner for heating an object to be heated such as glass stored in a tank kiln or the like. As shown in FIG. Internally,
Combustion air from the openings 22R and 22L and discharge fuel from the gas atomizing burner B (fuel in a state in which a liquid fuel atomized by a gas atomizing medium such as a fuel gas and a gas atomizing medium are mixed) The glass G mixed and burned above the glass G stored in the tank kiln 21
Is melted by heating. Conventionally, in such a gas atomizing burner, as shown in FIG. 7, a discharge port 12 is formed on one side of a discharge chamber 11 in a state that its cross-sectional shape is circular and the discharge side of the discharge chamber 11 is open. The liquid fuel ejecting passage 13 and the atomizing medium ejecting passage 14 connected to the opposite side are ejected from the ejecting port 12 to eject the liquid fuel and the gas atomizing medium ejected toward the ejecting port 12. The fuel discharged from No. 12 was mixed with combustion air and burned.

[0003]

However, in the prior art, since the discharge port is formed so that its cross-sectional shape is circular, the flame formed by the fuel discharged from the discharge port is a cylindrical flame. Therefore, there is a problem that the heating efficiency is poor because the heating area for the object to be heated is small.

The present invention has been made in view of the above circumstances, and an object thereof is to improve heating efficiency by rational improvement.

[0005]

A first characteristic structure of a combustion nozzle according to the present invention is that the discharge port is formed in a slit shape.

A second characteristic configuration is that the discharge chamber is formed in such a manner that the flow passage becomes narrower toward the opening side of the discharge port.

In a third characteristic configuration, the ejection passage ejects liquid fuel toward the ejection port, and a gas for atomizing the liquid fuel ejected from the liquid fuel ejection passage. The atomization medium ejecting path ejects the atomization medium toward the ejection port.

A fourth characteristic configuration is such that the slit intervals of the slit-shaped discharge ports are gradually increased toward both lateral end portions, and the narrowest slit interval of the slit-shaped discharge ports is the liquid fuel. It is located on the extension line of the axis of the jet passage.

In a fifth characteristic configuration, a concave portion having a diameter decreasing toward the discharge destination is formed on the upstream side in the discharge direction of the slit-shaped discharge port in a state where its axis coincides with the axis of the liquid fuel injection passage. There is a point.

In a sixth characteristic configuration, a plurality of the atomizing medium ejection passages are provided around the liquid fuel ejecting passage, and the atomizing medium ejecting passages each have an axial center of the liquid fuel ejecting passage toward the ejection destination. And is formed in a state of being shifted in the same circumferential direction when viewed in the axial direction.

[0011]

According to the first characteristic configuration, the fuel containing the gas fuel or the atomized liquid fuel ejected from the ejection passage toward the slit-shaped ejection port spreads in a plane form from the slit-shaped ejection port. Since it is discharged in a state, the flame formed by the fuel discharged from the slit-shaped discharge port becomes a fan-shaped flame.

According to the second characteristic configuration, the fuel including the gas fuel or the atomized liquid fuel ejected from the ejection passage toward the slit-shaped ejection port is once concentrated before the slit-shaped ejection port. After flowing in the state of being discharged, it is discharged from the slit-shaped discharge port in a state where it is effectively spread in a plane, so the flame formed by the fuel discharged from the slit-shaped discharge port is
A fan-shaped flame with a larger fan-shaped spread.

According to the third characteristic configuration, the liquid fuel and the gas atomization medium ejected from the liquid fuel ejection passage and the atomization medium ejection passage toward the slit-shaped ejection port are slit-shaped ejection ports. From the above, since the liquid fuel is atomized by the gas atomization medium and the liquid fuel and the gas atomization medium are mixed and discharged in a state of spreading in a plane, the liquid fuel is formed by the fuel discharged from the slit-shaped discharge port. The fired flame becomes a fan-shaped flame.

According to the fourth characteristic configuration, the gas atomizing medium ejected from the atomizing medium ejecting passage toward the slit-shaped discharge port flows toward the side where the slit spacing in both lateral directions of the slit is larger. Therefore, the liquid fuel is discharged from the slit-shaped discharge port in a state in which it spreads to both lateral and lateral sides of the slit, and the liquid fuel jetted from the liquid fuel jet passage toward the slit interval narrowest part of the slit-shaped jet port is: Since the slit interval flows from the narrowest part to the larger slit interval in both lateral directions of the slit, it discharges more effectively to both lateral sides of the slit, so that the slit is discharged from the slit-shaped outlet. The flame formed by the discharged fuel becomes a fan-shaped flame with a further fan-shaped spread.

According to the fifth characteristic configuration, the liquid fuel ejected from the liquid fuel ejection passage toward the concave portion of the slit-shaped discharge port once flows toward the central portion of the concave portion in a concentrated state. After that, since it is discharged in a state where it spreads out in a plane form from the slit-shaped discharge port, the flame formed by the fuel discharged from the slit-shaped discharge port becomes a fan-shaped flame with a further fan-shaped spread.

According to the sixth characteristic configuration, the gas atomizing medium ejected from the plurality of atomizing medium ejecting paths flows in a swirling state while enclosing the liquid fuel ejected from the liquid fuel ejecting path, Since it discharges from the slit-shaped discharge port in a state where it spreads to both lateral and lateral sides of the slit, the flame formed by the fuel discharged from the slit-shaped discharge port becomes a fan-shaped flame with a further fan-shaped spread, and discharge After that, since the swirling flow of the gas atomization medium flows in a state of stripping the liquid fuel, the atomization state of the liquid fuel by the gas atomization medium and the mixed state of the liquid fuel and the gas atomization medium are further improved. ..

[0017]

According to the first, second and third characteristic configurations, the flame formed by the fuel discharged from the discharge port can be made into a fan-shaped flame, so that the object to be heated can be heated as compared with the conventional one. The heating area can be increased and the heating efficiency can be improved.

According to the fourth and fifth characteristic configurations, a fan-shaped flame having a further fan-shaped spread can be obtained.
The heating efficiency can be further improved.

According to the sixth characteristic configuration, a fan-shaped flame having a further fan-shaped spread can be obtained, so that the heating efficiency can be further improved and the liquid fuel and the gas atomization medium can be further mixed. Since the state and the atomized state of the liquid fuel by the gas atomizing medium can be further improved, the stable combustibility can be further improved.

By the way, in the conventional gas atomizing burner as shown in FIG. 7, the liquid fuel and the gas atomizing medium are discharged from a circular discharge port having a small opening area. Therefore, the liquid fuel and the gas atomizing medium are respectively discharged. It was necessary to raise the supply pressure of. In addition, since the liquid fuel and the gas atomizing medium are mixed in the discharge chamber and discharged from the discharge port, the atomized liquid fuel tends to have a too small particle size. or,
Since liquid fuel remains in the discharge chamber, liquid fuel jet passage, etc.,
There is a problem that the residual liquid fuel is carbonized and the liquid fuel ejection passage and the discharge port are closed.

On the other hand, in the case of the gas atomized burner obtained by the sixth characteristic construction of the present invention, the liquid fuel and the gas atomizing medium are discharged from the slit-shaped discharge opening having a large opening area, and the liquid fuel is also discharged. Since the gas is discharged from the discharge port with almost no collision with the gas atomizing medium in the discharge chamber, the supply pressures of the liquid fuel and the gas atomizing medium can be made lower than in the conventional case by the synergistic effect of these.
Further, the liquid fuel and the gas atomizing medium that flows in a swirling state enclosing the liquid fuel are discharged from the discharge port with almost no mixing in the discharge chamber, and after the discharge, the swirling flow of the gas atomizing medium is generated. Since the liquid fuel flows in a state of being stripped off, the atomized liquid fuel can have a larger particle size than before. Further, since the liquid fuel hardly remains in the discharge chamber, the liquid fuel jet passage, or the like, it is possible to solve the problem that the residual liquid fuel is carbonized and the liquid fuel jet passage or the discharge port is blocked.

FIG. 8 shows a gas atomized burner.
6 is a graph showing the relationship between the atomized liquid fuel particle diameter and the flame emissivity (the higher the emissivity, the higher the brightness of the flame), the NOX value, and the length. In FIG. 8, the vertical axis represents the relative level of the emissivity, NOX value, and length. The particle size of the liquid fuel in the conventional gas atomizer burner has a low emissivity, a short length, and NOX.
In contrast to the high value of the point a, in the present invention, the particle size of the liquid fuel can be set to the point b larger than the point a,
Higher emissivity, longer length, and more NO than conventional
The X value can be lowered.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the embodiment of the present invention is applied to a gas atomizing burner will be described below with reference to the drawings.

As shown in FIG. 1, as a gas atomizing medium,
For example, in the connection member 1 having the connection portion 1a to the fuel gas supply pipe for supplying the gas fuel and the attachment portion 1b to the furnace body,
A holder 4 having a connecting portion 4a for connecting the outer pipe 2 and supplying a liquid fuel to the liquid fuel supply pipe and having an inner pipe 3 attached thereto is provided with the inner pipe 3 being concentric with the outer pipe 2. In the state of being connected, and the inner hole of the inner pipe 3 and the connecting portion 4a, and the annular gap between the inner pipe 3 and the outer pipe 2 and the connecting portion 1a are communicated with each other. The inner hole of the inner pipe 3 serves as the liquid fuel supply passage 5, and the annular gap between the inner pipe 3 and the outer pipe 2 serves as the gas fuel supply passage 6 to form the burner body of the gas atomizing burner. A burner head 7 is attached to the tip of the burner body.

Next, the specific structure of the burner head 7 will be described with reference to FIGS.

The burner head 7 includes a burner cap 8 and
It is composed of a first nozzle 9 and a second nozzle 10 which are fitted in the burner cap 8, and the second nozzle 10 is connected to the inner pipe 3 by screwing the burner cap 8 onto the outer pipe 2. Together with those burner caps 8 and 1
The nozzle 9 and the second nozzle 10 are integrally assembled.

The first nozzle 9 is formed in a substantially cylindrical shape with one end closed, and a slit-shaped discharge port 12 is formed in the closed wall portion of the cylindrical first nozzle 9, and the opening end thereof is formed into a second shape. It is connected to the nozzle 10. Therefore, the in-cylinder hole of the cylindrical first nozzle 9 serves as the discharge chamber 11, and the slit-shaped discharge port 12 is opened on one side of the discharge chamber 11.

In the second nozzle 10, a liquid fuel jet passage 13 for jetting liquid fuel toward a slit-shaped discharge port 12 is formed.
Is formed so that one end thereof is connected to the liquid fuel supply passage 5 and the other end thereof is connected to the side opposite to the opening side of the slit-shaped discharge port 12 in the discharge chamber 11. Also, the second
The nozzle 10 is provided with a slit-shaped discharge port 1 for gas fuel for atomizing the liquid fuel ejected from the liquid fuel ejection passage 13.
The plurality of gas fuel ejection passages 14 ejecting toward 2 are connected at one end to the gas fuel supply passage 6 and at the other end opposite to the opening side of the slit-shaped ejection port 12 in the ejection chamber 11. It is formed so as to be connected to the side.

The plurality of gas fuel jet passages 14 will be further described. As shown in FIG. 4, the plurality of gas fuel jet passages 14 are arranged around the liquid fuel jet passage 13 and the gas fuel jet passages are provided. 14 are formed so as to be closer to the axis P of the liquid fuel ejection path 13 toward the ejection destination and to be displaced clockwise in the circumferential direction when viewed in the direction of the axis P.

The slit-shaped ejection port 12 will be further described. As shown in FIG. 3, the slit-shaped discharge port 12
A triangular protrusion 12a is formed on one of the long side walls of the. Therefore, slit-shaped discharge port 1
The slit interval of 2 is formed so as to be the narrowest in the central portion in the slit direction and gradually increase toward both lateral end portions, and the narrowest slit interval is the liquid fuel ejection passage 1
It is arranged on the extension line of the axis P of No. 3.

Further, a conical concave portion 15 is formed inside the closed wall portion of the first nozzle 9 with its axis aligned with the axis P of the liquid fuel ejection passage 13.
Therefore, a concave portion 15 whose diameter is reduced toward the discharge destination is formed on the upstream side of the slit-shaped discharge port 12 in the discharge direction, with its axis aligned with the axis P of the liquid fuel jet passage 13.

Reference numeral 16 in FIG. 2 is an O-ring for sealing the liquid fuel supply passage 5 and the gas fuel supply passage 6 in an airtight state.

Specifically, for example, the liquid fuel ejection passage 13
The amount of liquid fuel jetted from the fuel tank is 100 l / h, and the amount of gas fuel jetted from the gas fuel jet passage 14 is a supply pressure of 1 Kg / cm ^2.
At 30 Nm ^{3 /} h, the inner diameter c of the liquid fuel ejection passage 13
Is 2 to 3 mm, and the gas fuel jet passage 14 has an inner diameter h of 3
.About.4 mm, the number is 6, and the proximity angle to the axis P and the shift angle in the circumferential direction are 15 to 20. still,
These dimensions are appropriately changed depending on the ejection amount of the liquid fuel, the supply pressure of the gas fuel, and the ejection amount. Further, when the jetting amount of the liquid fuel, the supply pressure and the jetting amount of the gas fuel are the same as above, the slit-shaped outlet 12 has a slit length e of 5 to 1
0 mm, the protrusion amount g at the narrowest slit interval is 0 to 2
mm, slit spacing f of the widest part on both sides of the slit is 2 to 5
mm, and the depth d of the recess 15 is 1 to 3 mm. The dimensions e, g, f, and d are appropriately changed and adjusted depending on the fan-shaped spread state of the fan-shaped flame and the type and shape of the furnace to which the gas atomizing burner is attached.

Next, referring to FIG. 6, an example of using the above gas atomizing burner will be described.

A plurality of gas atomizing burners B are arranged in parallel on both sides of a tank kiln 21 for melting the glass G, with the respective slit-shaped discharge ports 12 arranged laterally. Further, openings 22R and 22L are formed on both sides of the tank kiln 21 so as to correspond to the gas atomizing burners B provided on the both sides.

A flow path 23 is provided in each of the openings 22R and 22L on both sides.
And the combustion air A from the blower 24
From the air supply passage 29 through the passage 23 to the openings 2 on both sides.
2R, 22L air switching valves 25R, 25L for switching to supply from either one, and the opening 22R, 22L on both sides, which is different from the one supplying the combustion air, to the combustion in the kiln. The exhaust gas H is sucked in, and the flow path 23
Also, exhaust gas switching valves 27R and 27L are provided for switching to discharge from the chimney 26 through the flue 30.

28R and 28L in FIG.
It is a heat exchanger that exchanges heat with the flue gas H flowing therethrough or the combustion air A, and specifically, has a tuker brick inside.

The tank kiln 21 is constructed so that the gas atomizing burners B provided on both sides are alternately burned at intervals of, for example, 15 to 30 minutes. FIG. 6 shows the gas atomizing burner B on the side of the opening 22R. It shows the state of burning. That is, the air switching valve 25R is in the open state and 25L is in the closed state, while the exhaust gas switching valve 27R is in the closed state and 27L is in the open state.
The discharge fuel discharged from the gas atomizing burner B on the side of the opening 22R is heated by the heat exchanger 28R and is then heated by the opening 22R.
It is mixed with the combustion air A supplied from the above and is burned above the glass G in a state of forming a fan-shaped flame F. Then, the combustion exhaust gas H in the kiln is sucked from the opening 22L,
The combustion exhaust gas H is discharged from the chimney 26 after heating the heat exchanger 28L. The heat exchanger 28R is heated by the combustion exhaust gas H sucked from the opening 22R and stores heat when the gas atomizing burner B on the side of the opening 22L is burned before this.

On the other hand, when the gas atomizing burner B on the side of the opening 22L is burned, the air switching valve 25R is closed and 25L is open, while the exhaust gas switching valve 27R is open and 27L is closed. ..
At this time, the heat exchanger 28L heats the combustion air A,
On the other hand, the heat exchanger 28R is heated by the combustion exhaust gas H and stores heat.

[Other Embodiments] Next, other embodiments will be listed.

The structure of the discharge chamber 11 is not limited to the above-described embodiment, but can be variously modified. For example, as shown in FIG. 5, the discharge chamber 11 is formed in a state where the flow passage becomes narrower toward the opening side of the discharge port 12. You may.

The structure of the ejection passage is not limited to the above embodiment, but can be variously changed. For example, only the gas fuel may be ejected.

The arrangement configuration and the number of the atomizing medium ejection passages 14 are not limited to those in the above-described embodiment, but can be variously changed. For example, on both sides of the liquid fuel ejection passage 13,
A plurality of atomizing medium ejection paths 14 may be arranged in parallel along the slit direction of the slit-shaped ejection port 12. Further, in this case, the atomizing medium ejection passages 14 may be formed so as to be closer to the axis P of the liquid fuel ejection passage 13 toward the ejection destination.

The shape of the cross section of the slit-shaped ejection port 12 is not limited to the above-mentioned embodiment, but can be variously changed, and may be rectangular, for example.

In the above embodiment, the slit-shaped discharge port 1
On one of the side walls on the long side of 2, the triangular protrusion 12 is formed.
Although the case of forming a is illustrated, the convex portion 12a may be formed on each of the long side walls on both sides. Also, the convex portion 1
The shape of 2a can be variously changed, and may be, for example, an arc shape.

In the above-described embodiment, the case where the recess 15 whose diameter is reduced toward the discharge destination is formed on the upstream side in the discharge direction of the slit-shaped discharge port 12 has been exemplified.
Need not be formed.

In the above embodiment, each of the plurality of gas fuel ejection passages 14 is closer to the axis P of the liquid fuel ejection passage 13 toward the ejection destination and is displaced clockwise in the circumferential direction when viewed from the direction of the axis P. Although the case of forming is described as an example, it may be formed in a state in which it is closer to the axis P of the liquid fuel ejection passage 13 toward the ejection destination and is displaced in the counterclockwise direction in the circumferential direction when viewed from the direction of the axis P.

The gas atomizing medium is not limited to the gas fuel of the above embodiment, but may be air.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an overall configuration of a gas atomizing burner according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a burner head portion of a gas atomized burner according to an embodiment of the present invention.

FIG. 3 is a front view of a burner head portion of a gas atomized burner according to an embodiment of the present invention.

FIG. 4 is a view on arrow XX in FIG.

FIG. 5 is a side sectional view of a burner head portion of a gas atomized burner according to another embodiment.

FIG. 6 is a sectional view of a tank kiln for explaining an example of using a gas atomizing burner.

FIG. 7 is a side sectional view of a burner head portion of a conventional gas atomized burner.

FIG. 8 is a graph showing the relationship between the particle size of atomized liquid fuel, the emissivity of the flame, the NOX value, and the length of each gas atomized burner.

[Explanation of symbols]

 11 Discharge chamber 12 Discharge port 13 Liquid fuel ejection passage 14 Atomization medium ejection passage 15 Recess P P-axis

Claims (6)

[Claims] 1. A discharge port (1) on one side of a discharge chamber (11).
2) is opened, and the discharge port (12) is provided on the opposite side of the discharge chamber (11) from the opening side of the discharge port (12).
A combustion nozzle to which an ejection path for ejecting gas fuel or fuel containing atomized liquid fuel is connected to, and the ejection port (12) is formed in a slit shape. 2. The discharge chamber (11) is provided with the discharge port (1).
The combustion nozzle according to claim 1, wherein the flow passage is narrowed toward the opening of 2). 3. The liquid fuel jet passage (13) for jetting liquid fuel toward the discharge port (12) and the liquid fuel jetted from the liquid fuel jet passage (13) are atomized by the jet passage. The combustion nozzle according to claim 1 or 2, further comprising: an atomizing medium ejection passage (14) for ejecting a gas atomizing medium for ejecting toward the discharge port (12). 4. The slit-shaped ejection openings (12) are formed such that the slit spacing gradually increases toward both lateral end portions, and the slit-shaped ejection openings (12) have the narrowest slit spacing between the liquids. The combustion nozzle according to claim 3, wherein the combustion nozzle is arranged on an extension of the axis (P) of the fuel ejection passage (13). 5. A recess (1) having a diameter that decreases toward the discharge destination on the upstream side in the discharge direction of the slit-shaped discharge port (12).
The combustion nozzle according to claim 3 or 4, wherein 5) is formed so that its axis coincides with the axis (P) of the liquid fuel ejection passage (13). 6. A plurality of the atomization medium ejection passages (14) are provided around the liquid fuel ejection passage (13), and each of the atomization medium ejection passages (14) ejects the liquid fuel ejection toward the ejection destination. The combustion nozzle according to claim 3, 4 or 5, wherein the combustion nozzle is formed so as to be close to the axis (P) of the passage (13) and deviate in the same circumferential direction when viewed from the direction of the axis (P).