JPH09145028A - Combination burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the construction of a combination burner and to reduce operation costs. SOLUTION: A combination burner includes a scattering means 1 for scattering liquid fuel L and an atomizing gas blowoff port 6 for blowing off atomizing gas X against the scattered liquid fuel L' to atomize the fuel L' to burn the atomized liquid fuel L" and a gas fuel G fed from a gas fuel mixing means M in a mixed state. And a gas fuel feed source S, which can feed the gas fuel G at a pressure high enough to allow the fuel G to be used as the gas X, is provided, while the high pressure gas fuel G fed from the source S, in such a condition that the port 6 can be used as the means M, is blown off from the port 6 as the gas X.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses heavy oil, light oil, kerosene, or waste oil from various equipment as a liquid fuel, and this liquid fuel, natural gas, propane gas, or various by-product fuel gases, etc. Regarding the co-firing burner that simultaneously burns with the gaseous fuel, in detail, the scattering means for scattering the liquid fuel and the atomizing gas is ejected to the liquid fuel scattered by the scattering means to atomize the scattered liquid fuel. The present invention relates to a co-firing burner, which is equipped with an atomizing gas ejection port, and burns the atomized liquid fuel and the gaseous fuel supplied from the gaseous fuel mixing means in a mixed state.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional rotary type co-firing burner, in which the liquid fuel L supplied into the cylinder by a liquid fuel supply passage 2 is scattered from the tip end of the cylinder by a centrifugal force generated by the cylinder rotation. The atomizing cylinder 6 as a scattering means is the primary air A1 that is taken in from the primary air intake 13a and pressurized by the fan F as the atomizing gas X from the outer peripheral portion of the atomizing cylinder 1 to the scattered liquid fuel L '. An annular atomizing gas ejection port for ejecting, thereby atomizing the scattered liquid fuel L ′ from the atomizing cylinder 1, 9a is a secondary combustion air A2 from the outer peripheral portion of the atomizing gas ejection port 6. Secondary air outlet for ejecting Ng, Ng
Is a ring-shaped gaseous fuel jet that jets gaseous fuel G from the outer peripheral portion of the secondary air jet 9a as the gaseous fuel mixing means M, and 9b is for combustion and cooling from the further outer circumferential portion of the gaseous fuel jet Ng. Of the three annular air outlets 6, 9a, N
g and 9b are formed concentrically on the outer peripheral side of the atomizing cylinder 1.

That is, in the conventional co-firing burner, the air A1 (primary air) pressurized by the fan F with respect to the liquid fuel L'scattered by the scatterer 1 is atomized into the atomizing gas X.
As a result, the scattered liquid fuel L ′ is atomized by being ejected from the atomizing gas ejection port 6, and the gaseous fuel G is mixed with the gas fuel mixing means M provided separately from the atomizing gas ejection port 6. By injecting the gas fuel G from the atomized liquid fuel L ″ onto the atomized liquid fuel L ″,
This jet gas fuel G is mixed with the atomized liquid fuel L ″.

Reference numeral 3 is a motor for integrally rotating the atomizing cylinder 1 as a scattering means and the fan F for primary air pressurization via the speed increasing mechanism 4 and the common rotary shaft 5, and 1
Reference numeral 8'denotes a plurality of guide vanes that impart a swirling force to the pressurized primary air A1 as the atomizing gas X.

[0005]

However, in the conventional structure as described above, the atomizing gas ejection port 6 for ejecting the primary air A1 as the atomizing gas X, and the gaseous fuel injection as the gaseous fuel mixing means M are provided. The outlet Ng is required separately, and therefore, as shown in FIG. 4, the atomizing gas outlet 6 and the secondary air outlet 9 are provided around the atomizing cylinder 1 as the scattering means.
a, the gaseous fuel jet Ng, and the tertiary air jet 9b, and the supply paths for these jets 6, 9a, Ng, and 9b need to be formed in a multiple structure, which complicates the structure and reduces the manufacturing cost. However, there is a problem in that the overall structure of the burner becomes large relative to its combustion ability.

Further, in order to pressurize the atmospheric air A1 taken in from the primary air intake 13a to a high pressure (for example, 600 to 1000 mm water column) sufficient to be used as the atomizing gas X, the driving of the pressurizing fan F is required. The required power consumption of the motor 3 is large and the operating cost is high.
Also, the motor 3 needs to have a large capacity and a large size, and there is a problem that the entire structure of the burner is further increased.

In view of the above situation, the main object of the present invention is to make the structure of the structure by atomizing the liquid fuel scattered from the scattering means and mixing the gas fuel with the atomized liquid fuel rationally. It is in terms of simplification and reduction of power consumption.

[0008]

[Means for Solving the Problems]

[Regarding the Invention of Claim 1] In the invention of claim 1, the gas fuel supply source to be employed is capable of supplying gas fuel at a high pressure sufficient to use the gas fuel as atomizing gas as its original supply function. On the other hand, in the form of effectively utilizing the supply pressure of the gaseous fuel supply source for atomization of the liquid fuel,
The high pressure gaseous fuel supplied from the gaseous fuel supply source is used as the atomizing gas to atomize the scattered liquid fuel by the scattering means.

That is, with respect to the liquid fuel scattered by the scattering means, the high-pressure gaseous fuel supplied from the above-mentioned gaseous fuel supply source is used as the atomizing gas from the atomizing gas ejection port which also serves as the gas fuel mixing means. It is jetted, thereby atomizing the scattered liquid fuel by the scattering means, and at the same time mixing the gaseous fuel with the atomized liquid fuel.

Therefore, according to the first aspect of the invention, the gas fuel injection port as the gas fuel mixing means, which is formed separately from the atomization gas injection port in the above-mentioned conventional burner, can be omitted. Jet structure in the device,
In addition, the structure of the supply path to the ejection port can be simplified, and the device cost can be reduced and the overall burner configuration can be effectively reduced.

Moreover, since the supply pressure of the gas fuel supply source is effectively used for atomizing the liquid fuel, a large-capacity air-pressurizing fan, which has a large capacity like a conventional burner, can be omitted.
Even if the gas fuel supplied from the above-mentioned gas fuel supply source is pressurized by an auxiliary booster and supplied to the atomizing gas ejection port, this auxiliary booster has a small capacity and a small size. As a result, the operating cost can be effectively reduced, and in addition to the simplification of the device structure as described above, the downsizing of the entire burner structure can be achieved more effectively.

Furthermore, by using the gaseous fuel as the atomizing gas to atomize the scattered liquid fuel by the scattering means and at the same time mixing the atomized liquid fuel and the gaseous fuel, as in the conventional burner. , Compared to mixing the gas fuel with the atomized liquid fuel by ejecting the gas fuel in a form of joining the atomized liquid fuel from a gas fuel outlet different from the atomizing gas outlet By promoting the mixing of fuel and liquid fuel, the combustibility of mixed combustion can be enhanced. As a result, high combustibility can be stably maintained even when a low quality combustible liquid or gas fuel is used. Obtainable.

[Regarding the Invention of Claim 2] Claim 2
In the invention described, in the atomizing cylinder as a scattering means, the liquid fuel supplied into the cylinder is scattered from the tip end edge of the cylinder by the centrifugal force by the cylinder rotation, and, with respect to the liquid fuel scattered from the atomizing cylinder, The high-pressure gaseous fuel supplied from the gas supply source is ejected as an atomizing gas from an atomizing gas outlet on the outer peripheral portion of the atomizing cylinder, which also serves as a gas fuel mixing means, to scatter from the atomizing cylinder. At the same time as atomizing the liquid fuel
The gas fuel is mixed with the atomized liquid fuel.

That is, according to the second aspect of the invention, since the liquid fuel is scattered by the centrifugal force generated by the rotation of the atomizing cylinder,
For example, as compared with the case where the scattering means is of a type in which the liquid fuel is simply ejected from an ejection port and scattered, it is possible to reliably and stably disperse even a highly viscous liquid fuel in an easily atomized state. Therefore, it is possible to more effectively achieve the improvement of the combustibility in mixed firing.

[Regarding the Invention of Claim 3] Claim 3
In the invention described, the gas fuel ejected from the atomizing gas jet port is provided with a swirling flow forming means to impart a swirling force around the cylinder axis of the atomizing tube, so that the gas from the atomizing gas jet port is discharged. The jetted gaseous fuel is swirled around the cylinder axis of the atomizing cylinder while being atomized against the liquid fuel scattered from the atomizing cylinder, and mixed with this atomized liquid fuel.
The atomization efficiency of the liquid fuel and the mixing efficiency of the gas fuel and the liquid fuel are further improved as compared with the case where the gas fuel is ejected linearly from the atomization gas ejection port along the cylinder axis of the atomization cylinder. To improve.

That is, according to the third aspect of the present invention, by further improving the atomization efficiency and the mixing efficiency of the gaseous fuel and the liquid fuel, it is possible to more effectively achieve the improvement of the combustibility in the mixed combustion. You can

[Regarding the Invention of Claim 4] Claim 4
In the described invention, as the swirl flow forming means, a plurality of guide vanes are provided in parallel around the cylinder axis of the atomizing cylinder in the gas fuel supply path to the atomizing gas jet outlet, A swirling force is applied to the passing gas fuel around the cylinder axis of the atomizing cylinder by the guiding action of the guide vanes with respect to the passing gas fuel, whereby the gas fuel ejected from the atomizing gas ejection port is atomized. While being swung around the cylinder axis, the liquid fuel scattered from the atomizing cylinder is atomized and mixed with the atomized liquid fuel.

Further, by disposing this guide vane group at the rear end side of the atomizing cylinder in a state of being displaced from the atomizing cylinder in the axial direction of the atomizing cylinder, these guide vanes are arranged. Compared to arranging in the peripheral part of the atomizing tube, the radial direction of the atomizing tube (that is,
With respect to the radial direction of the burner), it is possible to reduce the overall size of the burner in the radial direction while ensuring a long guide vane length.

That is, according to the fourth aspect of the present invention, by ensuring the length of the guide vanes, the swirling of the gaseous fuel ejected from the atomizing gas ejection port is promoted to improve the atomization efficiency. While effectively improving the mixing efficiency, it is possible to effectively reduce the size of the entire burner structure in the radial direction.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2 and 3 show a rotary type co-firing burner according to the present invention, in which reference numeral 1 denotes a liquid fuel L supplied into a cylinder via a liquid fuel supply passage 2. The liquid fuel L supplied into the cylinder 1 from the liquid fuel supply passage 2 is a atomizing cylinder as a scattering means that scatters from the tip end edge of the cylinder by the centrifugal force generated by the cylinder rotation. It flows toward the tip end of the cylinder in a form along the inner surface of the cylinder which is a taper surface of the tip end, and then radially disperses in a state of forming a thin film from the end edge of the cylinder.

Reference numeral 3 is a motor for rotating the atomizing cylinder 1 at a high speed via a speed increasing mechanism 4 such as a belt transmission mechanism and a rotary shaft 5.

The reference numeral 6 designates the atomizing gas X from the outer peripheral portion of the atomizing cylinder 1 at a high speed (for example, 50 to 100 m / s) with respect to the liquid fuel L'radially scattered from the tip edge of the atomizing cylinder 1. It is an annular atomizing gas ejection port that ejects, and the high-speed ejection of the atomizing gas X atomizes the scattered liquid fuel L ′ from the atomizing cylinder 1.

Reference numeral 7 denotes an annular inner wall that surrounds the atomizing cylinder 1, and the annular gap between the leading edge of this inner wall 7 and the leading edge of the atomizing cylinder 1 is used for the atomizing gas injection described above. Exit 6, and again
An annular space between the inner peripheral surface of the inner wall 7 and the outer peripheral surface of the atomizing cylinder 1 serves as a supply path 8 for supplying the atomizing gas X to the atomizing gas jet port 6.

Reference numeral 9 denotes an annular air ejection port for ejecting the combustion air A from the outer peripheral portion of the atomizing gas ejection port 6,
An annular gap between an annular burner case 10 that surrounds the inner wall 7 and a brim-shaped baffle plate 11 formed at the tip of the inner wall 7 serves as the air ejection port 9 described above. An annular space between the peripheral surface and the outer peripheral surface of the inner wall 7,
The air A supply path 12 to the air ejection port 9 is used, and the air introduction path 1 is connected to the annular air supply path 12.
3 is connected.

Reference numeral 14 denotes the baffle plate 11 described above.
It is a plurality of auxiliary air ejection holes formed dispersed in the circumferential direction.

The tip portion of the burner case 10 is formed in a tapered shape such that the tip end of the atomizing cylinder 1 and the tip of the inner wall 7 are reduced in diameter further forward than the tip end of the inner wall 7. It is as a fire port 15 that faces B.

S is a gas fuel supply source for supplying a high-pressure gas fuel G (for example, 2000 mm water column) to the burner having the above structure, and the gas fuel supply passage 16 extending from this gas fuel supply source S is It is connected to an annular gas chamber 17 formed so as to surround the rotary shaft 5 behind the atomizing cylinder 1, and
As a burner structure, the gas chamber 17 forms a series of supply passages for the atomizing gas ejection port 6 together with the atomizing gas supply passage 8 so that the gas chamber 17 is formed over the entire circumference around the rotation axis 5. It is connected to the atomizing gas supply path 8.

That is, in this burner, the high-pressure gaseous fuel G supplied from the gaseous fuel supply source S is ejected as the atomizing gas X from the atomizing gas ejection port 6 on the outer peripheral portion of the atomizing cylinder. , The atomized liquid fuel L ′ from the atomizing cylinder 1 is atomized, at the same time, the atomized liquid fuel L ″ and the gaseous fuel G are mixed, and the atomized liquid fuel L ″ and the gaseous fuel G are mixed. Further to the air, the air outlet 9
While mixing the combustion air A ejected from the atomized liquid fuel L ″, the gaseous fuel G, and the combustion air A, the mixture air is ejected from the firing port 15 into the combustion chamber B. It is designed to burn.

That is, the atomizing gas ejection port 6 is
The gas fuel mixing means M for mixing the gas fuel G with the atomized liquid fuel L ″ is also used, and under this dual-purpose configuration, the supply pressure of the gas fuel supply source S is utilized to atomize. The sprayed liquid fuel L'from the cylinder 1 is atomized.

In the above structure, the combustion air A ejected from the air ejection port 9 also acts as cooling air for the tip of the burner case 10.

Reference numeral 18 denotes a swirl flow forming means R arranged in parallel at a predetermined interval around the cylinder axis P of the atomizing cylinder 1 (that is, around the axis of the rotary shaft 5) at the outlet of the gas chamber 17. Gas fuel G that is a plurality of axial flow type guide vanes and is sent from the annular gas chamber 17 to the annular atomizing gas supply path 8 as well.
In addition, by applying a swirling force around the cylinder axis P of the atomizing cylinder 1 by the guide action of these guide vanes 18, the gas fuel G to be ejected as the atomizing gas X from the atomizing gas ejection port 6 is provided. The swirling is performed around the cylinder axis P of the atomizing cylinder 1, so that the atomizing efficiency of the liquid fuel L and the mixing efficiency of the liquid fuel L and the gas fuel G are secured high.

By arranging the guide vanes 18 at the outlet of the annular gas chamber 17 arranged on the rear side of the atomizing cylinder 1, that is, in the direction of the cylinder axis P of the atomizing cylinder 1. By arranging it on the rear end side of the atomizing cylinder 1 in a state of being displaced from the cylinder 1, the length of the guide vanes 18 is increased in the radial direction of the atomizing cylinder 1 (that is, the radial direction of the burner). The overall burner configuration can be reduced in size in the radial direction while ensuring it.

[Another Embodiment] Next, another embodiment of the present invention will be listed. The combustion air A is pressurized and supplied to the air supply path 12 by a blower 19 shown by a broken line in FIG. 1, or the blower 19 is omitted and the gaseous fuel G is ejected from the atomizing gas ejection port 6. Any of the modes of sucking air from the air introducing passage 13 by the suction action accompanying the above may be adopted.

As the gaseous fuel G, various kinds of combustible gases such as natural gas, propane gas, and various by-produced fuel gases can be adopted, and the gaseous fuel supply source S is As the original supply function, various supply sources can be adopted as long as the gas fuel G can be supplied at a pressure high enough to be used as the atomizing gas X.

In the above embodiment, the high pressure gas fuel G is directly supplied to the atomizing gas jet port 6 only by the supply pressure of the gas fuel supply source S, but the atomization efficiency is further improved. In order to improve the above, the high pressure gaseous fuel G supplied from the gaseous fuel supply source S may be further boosted by an auxiliary booster and supplied to the atomizing gas ejection port 6.

Atomizing gas ejection port 6 from the gaseous fuel supply source S
A mode may be adopted in which an appropriate amount of combustion air is mixed with the gaseous fuel G to be supplied to and the mixture gas is ejected as the atomizing gas X from the atomizing gas ejection port 6. In this case, if an ejector-type mixer for mixing the combustion air into the passing gas fuel G by the ejector action by the high-speed passage of the gas fuel G is adopted, a blower for pressurizing and mixing the combustion air with the high-pressure gas fuel G is adopted. Is unnecessary.

As the swirling flow forming means R for imparting a swirling force around the cylinder axis P of the atomizing cylinder 1 to the gaseous fuel G ejected from the atomizing gas ejection port 6, the shaft as in the above-mentioned embodiment is used. In addition to the flow type fixed guide vane 18, various types can be adopted. For example, by blowing the high pressure gas fuel G into the annular gas chamber 17 in the tangential direction of the inner peripheral surface thereof, You may employ the form which gives a turning force. Also,
When adopting the guide vane 18 group, when miniaturization of the entire burner configuration in the cylinder axis P direction of the atomization cylinder 1 is required, the guide vane 18 group is arranged in the peripheral portion of the atomization cylinder 1. A configuration may be adopted.

As the liquid fuel L, heavy oil, light oil, kerosene,
Alternatively, various combustible liquids such as waste oil from various devices can be adopted.

Each of the jet outlets 6, 9 and the jet outlets 6, 9.
The concrete structure and shape of the supply passages 8, 17, 12 for 9 can be modified in various ways. For example, the air jet port 9 and the combustion air is jetted from the outer peripheral portion of the atomizing gas jet port 6. It is also possible to separately form a ring-shaped jet port that is formed into a ring-shaped jet port and a ring-shaped jet port that jets air for combustion and cooling from the outer peripheral portion thereof.

The scattering means for scattering the liquid fuel L is not limited to the atomizing cylinder 1 as in the above embodiment,
For example, by spraying the liquid fuel L on the collision plate, the liquid fuel L
Of the type that scatters in the radial direction of the collision plate, or
Various types such as a type in which the liquid fuel L is scattered only by being ejected from the ejection port can be adopted.

Although the description of the valves has been omitted in the above embodiment, the gaseous fuel G, the liquid fuel L, and the combustion air A are used.
As for the equipment of the valves such as the flow rate adjusting valve and the supply / interruption valve for each of the above, an appropriate equipment configuration may be adopted as necessary.

It should be noted that reference numerals are added to 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 the drawings]

FIG. 1 is a vertical sectional view showing a burner structure.

FIG. 2 is a sectional view taken along the line II in FIG.

FIG. 3 is a sectional view taken along the line ROLL in FIG.

FIG. 4 is a vertical cross-sectional view showing a conventional burner structure.

[Explanation of symbols]

1 scattering means (atomization cylinder) L liquid fuel L'scattered liquid fuel X atomization gas 6 atomization gas jet L "atomization liquid fuel M gas fuel mixing means G gas fuel S gas fuel supply source P atomization Cylinder axis R R swirl flow forming means 8 and 17 Gas fuel supply path to atomizing gas jet 18 Guiding vane

Claims (4)

[Claims] 1. A scattering means (1) for scattering a liquid fuel (L), and a liquid fuel (L ') scattered by the scattering means (1).
And an atomizing gas outlet (6) for ejecting the atomizing gas (X) to atomize the scattered liquid fuel (L '), and the atomizing liquid fuel (L ") and the gas. Fuel mixing means (M)
A mixed combustion burner that burns a gas fuel (G) supplied from a gas mixture in a mixed state, and the gas fuel (G) is mixed with the gas fuel (G) at a pressure high enough to be used as the atomizing gas (X). ), There is a gas fuel supply source (S) that can be supplied to the gas fuel mixing means (M). A co-firing burner configured to eject high-pressure gaseous fuel (G) supplied from the gaseous fuel supply source (S) as atomizing gas (X) from the atomizing gas ejection port (6). 2. An atomizing cylinder (1) is provided as the atomizing means, wherein the liquid fuel (L) supplied into the cylinder (1) is scattered from the tip edge of the cylinder by a centrifugal force generated by the rotation of the cylinder. The gas outlet (6) for gas atomizes the gaseous fuel (G) from the outer peripheral portion of the atomizing tube (1) with respect to the liquid fuel (L ′) scattered from the atomizing tube (1) ( The burner burner according to claim 1, wherein the mixed burner has a structure for ejecting X). 3. A swirling flow forming for imparting a swirling force around the cylinder axis (P) of the atomizing cylinder (1) to the gaseous fuel (G) ejected from the atomizing gas ejection port (6). Means (R)
The mixed burner according to claim 2, wherein the burner is provided. 4. The swirl flow forming means (R) is a tube of the atomizing tube (1) in a supply path (8, 17) of the gaseous fuel (G) to the atomizing gas jet port (6). Shaft core (P)
The guide vanes (18) formed by a plurality of guide vanes (18) arranged in parallel around each other are used to form the swirl flow forming means in the atomizing cylinder (1) in the cylinder axis (P) direction. The co-firing burner according to claim 3, wherein the atomization cylinder (1) is arranged on the rear end side in a state of being displaced from the cylinder (1).