JP6929063B2 - Type 2 fuel burner - Google Patents

Description

The present invention relates to a type 2 fuel burner that burns a gaseous fuel and an atomized liquid fuel in a combustion space.

Such a type 2 fuel burner burns a gaseous fuel such as city gas and a liquid fuel such as heavy oil in a combustion space, and is installed and used in various heating furnaces and the like.
By atomizing the liquid fuel, combustibility is ensured, and as a method of atomizing the liquid fuel, there is a method of pressurizing the liquid fuel and spraying it in the form of a mist from the liquid fuel ejection nozzle. In this case, there is an inconvenience that a pump that pressurizes the liquid fuel to a high pressure is required.
Further, there is a method of atomizing using vapor pressure, but in the case of this method, it cannot be carried out when there is no vapor for atomization.

Therefore, as a method for atomizing the liquid fuel, there is a method configured to atomize the liquid fuel by using the gaseous fuel as the gas for atomization (see, for example, Patent Document 1).
Incidentally, in Patent Document 1, a gas fuel ejection path and a mixing chamber on the tip side thereof are formed in an ejector that ejects gas fuel toward the combustion space, and liquid fuel is injected from the outer peripheral side of the mixing chamber inside the mixing chamber. By supplying the fuel to the combustion body, the gaseous fuel and the atomized liquid fuel are ejected from the ejector into the combustion space.

Japanese Unexamined Patent Publication No. 2006-137965

Since the conventional type 2 fuel burner uses a gas fuel as a gas for atomizing the liquid fuel, the ratio of the liquid fuel to the gas fuel is large in order to burn the liquid fuel while appropriately atomizing it. It was something that could not be changed.

That is, in the type 2 fuel burner, depending on the usage situation, it may be desired to burn the liquid fuel in a larger amount than the gas fuel or to burn the gas fuel in a larger amount than the liquid fuel. Depending on the case, it may be desired to burn only the liquid fuel or only the gas fuel.

However, since the conventional type 2 fuel burner uses a gas fuel as a gas for atomizing the liquid fuel, the amount of the liquid fuel is larger than that of the gas fuel in order to burn the liquid fuel while appropriately atomizing it. It is not possible to burn it or to burn only liquid fuel, and improvement was desired.

The present invention has been made in view of the above circumstances, and the ratio of the liquid fuel to the gaseous fuel can be significantly changed, and moreover, when the liquid fuel and the gaseous fuel are burned in a co-combustion state, the present invention is made. The point is to provide a type 2 fuel burner capable of satisfactorily burning a liquid fuel while appropriately holding the flame with a combustion flame of a gaseous fuel.

The type 2 fuel burner of the present invention burns a gaseous fuel and an atomized liquid fuel in a combustion space, and its characteristic configuration is as follows.
The liquid fuel supplied through the liquid fuel supply path is atomized by the atomizing air supplied through the atomization air supply path to the center of the burner, and the atomized liquid fuel is ejected into the combustion space. A liquid fuel ejection part is provided to
A tubular combustion air supply path for supplying combustion air to the combustion space is provided on the outer periphery of the burner through an annular air ejection hole at the tip.
The gas fuel ejection path on the tip side of the burner that ejects the gas fuel into the combustion space and the gas fuel supply path are supplied to a portion corresponding to the space between the liquid fuel ejection section and the combustion air supply path. A gas fuel ejection nozzle for ejecting gaseous fuel into the gaseous fuel ejection path is provided, and the liquid fuel ejection portion, the gaseous fuel ejection path, and the air ejection hole are provided from the center of the burner toward the outer periphery. It is configured to be lined up
A communication portion is formed to introduce a part of the air flowing through the combustion air supply path into the negative pressure space between the gas fuel ejection path and the gaseous fuel ejection nozzle .
The liquid fuel supply path formed by the liquid fuel supply pipe along the burner axis direction is formed by the inner pipe along the burner axis direction in which the liquid fuel supply pipe is arranged inside. Located inside the road,
The liquid fuel ejection portion is configured to atomize the liquid fuel ejected from the tip of the liquid fuel supply path with the atomizing air ejected from the periphery of the tip of the liquid fuel supply path. There is a point.

That is, the liquid fuel supplied through the liquid fuel supply path is atomized by the atomizing air supplied through the atomization air supply path, and is ejected from the liquid fuel ejection portion in the center of the burner into the combustion space. ..
In this case, if the concentration of the atomized liquid fuel with respect to the atomizing air is too low, the ignitability of the liquid fuel is lowered and the combustibility of the liquid fuel is lowered. The amount of supply is less than the amount of air required to burn the liquid fuel, for example, about 20% of the amount of air required to burn the liquid fuel to ensure the flammability of the liquid fuel. However, the liquid fuel will be atomized.

Since the combustion air supplied through the combustion air supply path is ejected into the combustion space from the annular air ejection hole on the outer periphery of the burner, the combustion air ejected from the air ejection hole is used as the combustion air for the liquid fuel. It is used to burn the atomized liquid fuel ejected from the liquid fuel ejection part into the combustion space.

The gas fuel is ejected into the combustion space from the gas fuel ejection path provided between the liquid fuel ejection section and the combustion supply path. A gas fuel ejection nozzle is provided, and a communication part that introduces a part of the air flowing through the combustion air supply path into the negative pressure space between the gas fuel ejection path and the gas fuel ejection nozzle is provided. Since the gas fuel is provided, the combustion air is premixed with the gas fuel ejected from the gas fuel ejection path into the combustion space, and the combustibility of the gas fuel is improved.

That is, by ejecting the gaseous fuel from the gaseous fuel ejection nozzle into the gaseous fuel ejection path, the space between the gaseous fuel ejection path and the gaseous fuel ejection nozzle becomes a negative pressure state due to the venturi effect, and in the negative pressure space. In the sucked form, a part of the air flowing through the combustion air supply path flows to the gas fuel ejection path through the communication portion.
As a result, combustion air is premixed with the gas fuel ejected from the gas fuel ejection path.

Although combustion air is premixed with the gas fuel ejected from the gas fuel ejection path into the combustion space, the combustion air required for combustion is insufficient, so combustion is performed from the air ejection holes on the outer periphery of the burner. The combustion air ejected into the space is used as the combustion air for the gaseous fuel, and the gaseous fuel ejected from the gaseous fuel ejection path into the combustion space is burned.
That is, the combustion air ejected from the air ejection hole on the outer periphery of the burner into the combustion space is ejected into the combustion space from the atomized liquid fuel ejected from the liquid fuel ejection portion into the combustion space and from the gas fuel ejection path. It will be used as combustion air with gas fuel.

Then, the gaseous fuel ejected from the gaseous fuel ejection path into the combustion space burns in a form that covers the periphery of the atomized liquid fuel ejected from the liquid fuel ejection portion into the combustion space. The atomized liquid fuel ejected from the unit into the combustion space is burned while being held by the combustion flame of the gaseous fuel.

In other words, when the liquid fuel and the gas fuel are burned, the combustion air is premixed and the combustion flame of the gas fuel that burns with good stability properly holds the flame while burning from the liquid fuel ejection part. The liquid fuel and the gas fuel are co-combusted in a state where the atomized liquid fuel ejected into the space is burned.

Further, since the liquid fuel is atomized with the atomizing air, the liquid fuel can be appropriately atomized and burned even if the supply amount of the gaseous fuel is reduced. Therefore, the gas. It is also possible to reduce the supply of fuel, or in some cases, eliminate the supply of gaseous fuel and burn only liquid fuel.
By the way, when reducing the supply amount of gas fuel, it is unnecessary to reduce the supply amount of combustion air supplied through the combustion air supply path on the outer periphery of the burner in accordance with the decrease in the supply amount of gas fuel. It avoids supplying a large amount of combustion air.

Since the combustion air for the gas fuel ejected from the gas fuel ejection path into the combustion space is ejected into the combustion space from the air ejection holes on the outer periphery of the burner, the supply amount of the liquid fuel is reduced, and in some cases, it may be reduced. , It is also possible to eliminate the supply of liquid fuel and burn only gas fuel.
By the way, when reducing the supply amount of liquid fuel, the supply amount of atomization air supplied through the atomization air supply path and the supply amount of combustion air supplied through the combustion air supply path on the outer periphery of the burner are changed. By reducing the amount of liquid fuel supplied in accordance with the decrease in the amount of liquid fuel supplied, it is possible to avoid supplying an unnecessarily large amount of atomizing air or an unnecessarily large amount of combustion air.
Since combustion air is premixed with the gas fuel in advance, the amount of combustion air supplied as the combustion air of the gas fuel through the combustion air supply path on the outer periphery of the burner should be reduced. In other words, it is possible to burn gaseous fuel at a low air ratio.

In this way, by atomizing the liquid fuel with the atomizing air, the liquid fuel is appropriately atomized and burned satisfactorily, while the supply amount of the gaseous fuel and the supply of the liquid fuel. The amount can be changed significantly. In other words, the ratio of liquid fuel to gaseous fuel can be changed significantly.

In short, according to the characteristic configuration of the two-kind fuel burner of the present invention, the ratio of the liquid fuel and the gaseous fuel can be significantly changed, and moreover, when the liquid fuel and the gaseous fuel are burned in a co-combustion state, the liquid is used. The fuel can be satisfactorily burned while being appropriately held by the combustion flame of the gaseous fuel.
Further, since the liquid fuel ejected from the tip of the liquid fuel supply path is atomized by ejecting the atomizing air from around the tip of the liquid fuel supply path, the liquid fuel supply path is used for atomization. The liquid fuel can be atomized with a simple configuration arranged inside the air supply path.
In short, according to the characteristic configuration of the type 2 fuel burner of the present invention, the configuration for atomizing the liquid fuel is simplified.
It can be made into a material.

A further characteristic configuration of the type 2 fuel burner of the present invention is that the gas fuel ejection passages are provided in a plurality of annular bodies surrounding the liquid fuel ejection portion at intervals in the circumferential direction.
The point is that the gas fuel ejection nozzle is provided corresponding to each of the plurality of said gas fuel ejection passages.

That is, since the gas fuel ejection path is formed in the annular body surrounding the liquid fuel ejection portion with different phases in the circumferential direction, the annular body is formed to cover the outer periphery of the liquid fuel ejection portion. If installed, a plurality of gas fuel ejection paths can be provided with different phases in the circumferential direction.
That is, it is possible to simplify the installation configuration of a plurality of gas fuel ejection passages.

Then, by providing a plurality of gas fuel ejection nozzles corresponding to each of the plurality of gas fuel ejection paths, the mist ejected from the liquid fuel ejection portion into the combustion space when the liquid fuel and the gas fuel are burned is provided. The atomized liquid fuel ejected into the combustion space is satisfactorily burned while holding the flame with the combustion flame of the gas fuel by appropriately covering the circumference of the liquefied liquid fuel with the combustion flame of the gas fuel. Can be made to.

In short, according to the further characteristic configuration of the type 2 fuel burner of the present invention, the atomized liquid fuel ejected into the combustion space is gas while trying to simplify the installation configuration of the plurality of gas fuel ejection passages. It can be properly burned by holding the flame with the combustion flame of the fuel.

A further characteristic configuration of the type 2 fuel burner of the present invention is that the tip side portion of the gas fuel injection path and the combustion air supply path is formed in an inclined shape located inward in the radial direction toward the tip end side of the burner. There is a point.

That is, since the tip side portion of the gas fuel ejection path and the combustion air supply path is formed in an inclined shape located inward in the radial direction toward the tip end side of the burner, the diameter of the tip end portion of the burner can be reduced. Therefore, for example, when the type 2 fuel burner is installed on the furnace wall of the heating furnace, the diameter of the burner installation hole opened in the furnace wall can be reduced, and the convenience for installing the type 2 fuel burner is improved. Can be made to.

Further, since the gas fuel ejected from the gas fuel ejection path and the combustion air ejected from the air ejection hole are directed toward the center side of the burner, the combustion of the gas fuel is performed when the liquid fuel and the gas fuel are burned. By burning the flame while suppressing its spread to the outside, the atomized liquid fuel ejected from the liquid fuel ejection part into the combustion space is more appropriately held by the combustion flame of the gas fuel. It can be burned well.

In short, according to the further characteristic configuration of the type 2 fuel burner of the present invention, the convenience for installation can be improved, and the atomized liquid fuel ejected into the combustion space can be used as the combustion flame of the gas fuel. It can be burned well while retaining the flame more appropriately.

Further characteristic configurations of the two-kind fuel burner of the present invention are the liquid fuel adjusting unit for adjusting the supply amount of the liquid fuel, the atomizing air adjusting unit for adjusting the supply amount of the atomizing air, and the gaseous fuel. A point is that a gas fuel adjusting unit for adjusting the supply amount and a combustion air adjusting unit for adjusting the supply amount of the combustion air are provided.

That is, since the supply amount of the liquid fuel, the supply amount of the atomizing air, the supply amount of the gas fuel, and the supply amount of the combustion air can be adjusted, the ratio of the liquid fuel to the gas fuel is significantly changed. While doing so, the liquid fuel and the gas fuel can be co-combusted, and it is possible to appropriately switch to a state in which only the liquid fuel is burned or a state in which only the gas fuel is burned.

In short, according to the further characteristic configuration of the type 2 fuel burner of the present invention, the combustion state can be appropriately changed.

A further characteristic configuration of the type 2 fuel burner of the present invention is that the combustion space is formed in a truncated cone shape whose diameter increases toward the tip side.

That is, in the combustion space formed in a conical trapezoidal shape whose diameter increases toward the tip side, the gas fuel and the liquid fuel can be burned in a co-firing state while suppressing the expansion in the radial direction. Liquid fuel can be burned well in a co-firing state.

In short, according to the further characteristic configuration of the type 2 fuel burner of the present invention, the gaseous fuel and the liquid fuel can be satisfactorily burned in the co-firing state.

Longitudinal side view of Type 2 fuel burner Longitudinal side view of the tip of the burner Front view of the tip of the burner Longitudinal side view of the tip of the Type 2 fuel burner of another embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Overall configuration of Type 2 fuel burner)
As shown in FIG. 1, a truncated cone-shaped combustion space N whose diameter increases toward the tip side is formed in the burner tile 1 mounted on the furnace wall R of the heating furnace, and a flame F is formed inside the combustion space N. A type 2 fuel burner B is provided to burn the fuel.

The type 2 fuel burner B is configured to burn using a liquid fuel such as heavy oil and a gaseous fuel such as city gas as fuel.
That is, it is configured to burn the gaseous fuel and the atomized liquid fuel in the combustion space N.

That is, the outer cylinder 3 is provided in a state of being connected to the annular support 2 mounted on the end face portion of the burner tile 1, the annular connecting body 4 is provided at the end of the outer cylinder 3, and the annular connection thereof is provided. The first intermediate cylinder 5 is provided in a state of being supported by the body 4.
A state in which a second intermediate cylinder 6 having a diameter smaller than that of the first intermediate cylinder 5 and an inner cylinder 7 fitted in the second intermediate cylinder 6 are connected and supported by a support 8 at the end of the first intermediate cylinder 5. It is provided.
A liquid fuel supply pipe 9 for supplying liquid fuel is provided inside the inner cylinder 7 in a state of being supported by a connecting body 10 connected to an end portion of the inner cylinder 7.

As shown in FIG. 2, an air guide body 7A having a smaller diameter toward the tip side is provided at the tip end portion of the inner cylinder 7, and a liquid fuel ejector 9A is provided at the tip end portion of the liquid fuel supply pipe 9. The outer surface of the tip end portion of the ejector 9A is formed so as to face the air guide body 7A and have a smaller diameter toward the tip end side.

The outer cylinder 3, the first intermediate cylinder 5, the second intermediate cylinder 6, the inner cylinder 7, and the liquid fuel supply pipe 9 are arranged concentrically with the axis of the type 2 fuel burner B as the center.
The annular body 11 is provided so as to cover the outer periphery of the air guide body 7A at the tip of the inner cylinder 7. The annular body 11 is provided with gas fuel ejection passages 12 for ejecting gaseous fuel into the combustion space N at intervals in the circumferential direction (see FIG. 3).

In the present embodiment, the annular body 11 is provided in a state of being integrally formed with the air guide body 7A at the tip of the inner cylinder 7. That is, the annular body 11 is formed in a form in which the air guide body 7A is provided on the inner side in the radial direction and the annular portion forming the gas fuel ejection path 12 is provided on the outer side in the radial direction.
Instead of such a configuration, the annular body 11 and the air guide body 7A may be formed as separate bodies, and the annular body 11 may be provided so as to be fitted onto the air guide body 7A.

An atomization air supply path Lm for supplying atomization air is formed between the inner cylinder 7 and the liquid fuel supply pipe 9, and an atomization air supply path Lm is formed inside the liquid fuel supply pipe 9. A liquid fuel supply path Ln arranged inside the above is formed.
A swirling blade 16 for swirling the atomizing air is provided at a position corresponding between the ejecting body 9A and the air guide body 7A.
Therefore, the liquid fuel ejected from the ejector 9A is atomized and atomized by the atomizing air ejected inward in the radial direction through between the ejector 9A and the air guide 7A. A liquid fuel ejection portion D for ejecting the liquid fuel into the combustion space N is formed in the center of the burner.

That is, the liquid fuel ejection portion D atomizes the liquid fuel ejected from the tip of the liquid fuel supply path Ln with the atomizing air ejected from around the tip of the liquid fuel supply path Ln, and is centered on the burner. The annular body 11 is provided in the portion so as to surround the liquid fuel ejection portion D.
By the way, if the concentration of the liquid fuel with respect to the atomizing air is too low, the ignitability of the liquid fuel will be lowered and the combustibility of the liquid fuel will be lowered. The amount is smaller than the amount of air required to burn the fuel, and in the present embodiment, it is set to about 20% of the amount of air required to burn the liquid fuel.

Further, between the support 2 and the annular body 11, an annular air ejection hole 13 for ejecting combustion air is formed in the combustion space N, which is on the inner side of the outer cylinder 3 and is on the inner side of the annular body 11 and the ring body 11. 1 A cylinder that supplies combustion air to the air ejection hole 12 at the tip at a location corresponding to the outer side of the intermediate cylinder 5 (in other words, between the outer cylinder 3 and the annular body 11 and the first intermediate cylinder 5). The shape of the combustion air supply path Ls is formed.
That is, a tubular combustion air supply path Ls for supplying combustion air to the annular air ejection hole 13 and the air ejection hole 12 is provided on the outer peripheral portion of the burner.

Then, between the liquid fuel ejection portion D and the combustion air supply passage Ls, the gas fuel ejection passage 12 formed in the above-mentioned annular body 11 and the cylinder between the first intermediate cylinder 5 and the second intermediate cylinder 6 are formed. A gas fuel ejection nozzle 14 for ejecting the gaseous fuel supplied through the gas fuel supply passage Lg formed in the shape into the gaseous fuel ejection passage 12 is provided.
That is, the gas fuel is supplied to a portion corresponding between the liquid fuel ejection portion D and the combustion air supply path Ls through the gas fuel ejection path 12 on the burner tip side for ejecting the gas fuel into the combustion space N and the gas fuel supply path Lg. A gas fuel ejection nozzle 14 for ejecting the gas fuel to be produced into the gaseous fuel ejection path 12 is provided.

Further, the communication portion E that introduces a part of the air flowing through the combustion air supply path Ls into the negative pressure space between the gas fuel ejection path 12 and the gas fuel ejection nozzle 14 is connected to the gas fuel ejection path 12. The space between the gas fuel ejection nozzle 14 and the combustion air supply path Ls are formed to communicate with each other.
That is, the communication portion E is configured to communicate a part of the combustion air supply path Ls on the inner side in the radial direction to the space between the gas fuel ejection path 12 and the gas fuel ejection nozzle 14.

Therefore, by ejecting the gas fuel from the gas fuel ejection path 14 into the gaseous fuel ejection path 12, the space between the gaseous fuel ejection path 12 and the gaseous fuel ejection nozzle 14 becomes a negative pressure state due to the venturi effect, and the negative pressure state is obtained. A part of the air passing through the combustion air supply path Ls is introduced into the gas fuel ejection path 12 in the form of being sucked in the pressure space, and as a result, is ejected from the gas fuel ejection path 12. The gaseous fuel is configured to be premixed with combustion air.

Incidentally, the first is in a state where the annular closing plate 15 that closes the annular opening between the tip of the first intermediate cylinder 5 and the tip of the second intermediate cylinder 6 opens the connection point of the gas fuel ejection nozzle 14. A gas fuel ejection nozzle 14 is attached to the tip of the intermediate cylinder 5 and the second intermediate cylinder 6, and is attached to the closing plate 15.

Therefore, the type 2 fuel burner B uses air as atomized liquid fuel ejected from the liquid fuel ejection portion D in the center of the burner into the combustion space N and gas fuel ejected from the combustion space N from the gas fuel ejection path 12. It is in the form of burning using the combustion air ejected from the ejection hole 12, and is configured to be burned in a mixed combustion state in the combustion space N.

In addition, the type 2 fuel burner B2 is a gas by mixing a part of the air flowing through the combustion air supply path Ls with the gas fuel ejected from the gas fuel ejection nozzle 14 to the gaseous fuel ejection path 12. By premixing the fuel air with the gas fuel ejected from the fuel ejection path 12, the gas fuel is burned with good stability, and the liquid fuel is ejected by the combustion flame of the gas fuel that burns with good stability. It is configured to co-fire the liquid fuel and the gaseous fuel while appropriately holding the atomized liquid fuel ejected from the part D into the combustion space N.

(Regarding the adjustment of combustion state)
As shown in FIG. 1, a liquid fuel adjusting valve Vn is provided as a liquid fuel adjusting unit for adjusting the supply amount of the liquid fuel in the external liquid fuel passage Zn connected to the liquid fuel supply pipe 9.
Further, the external atomization air passage Zm connected to the atomization air inlet portion Wm of the atomization air supply path Lm is atomized as an atomization air adjusting unit for adjusting the supply amount of atomization air. An air regulating valve Vm is provided.

Similarly, a gas fuel adjusting valve Vg is provided as a gas fuel adjusting unit for adjusting the supply amount of the gas fuel in the external gas fuel passage Zg connected to the gas fuel inlet portion Wg of the gas fuel supply path Lg.
Further, in the external combustion air passage Zs connected to the combustion air inlet portion Ws of the combustion air supply passage Ls, a combustion air adjusting valve Vs is provided as a combustion air adjusting unit for adjusting the supply amount of combustion air. It is provided.

In the present embodiment, the external atomization air passage Zm and the external combustion air passage Zs are provided so as to be branched from a common air supply passage Zk that guides air from an air supply unit such as an air supply blower. However, it may be implemented in a form in which an air supply unit such as an air supply blower is provided separately for each of the external atomization air passage Zm and the external combustion air passage Zs.

Therefore, the supply amount of liquid fuel and the supply amount of gaseous fuel can be changed according to the usage situation, etc., and the supply amount of combustion air is supplied according to the change in the supply amount of liquid fuel and the supply amount of gaseous fuel. The amount can be changed.
Moreover, when changing the supply amount of the liquid fuel, the supply amount of the atomizing air can be changed according to the supply amount of the liquid fuel.

That is, since the type 2 fuel burner B of the present embodiment atomizes the liquid fuel with the atomizing air, the liquid fuel is appropriately atomized even if the supply amount of the gaseous fuel is reduced. Since it can be burned, the supply amount of gaseous fuel can be reduced, and in some cases, the supply of gaseous fuel can be eliminated and only liquid fuel can be burned.

Further, since the combustion air for the gas fuel ejected from the gas fuel ejection path 12 into the combustion space N is ejected from the air ejection hole 13 on the outer periphery of the burner into the combustion space N, the supply amount of the liquid fuel can be increased. It is also possible to reduce, in some cases, eliminate the supply of liquid fuel and burn only gaseous fuel.

Then, when increasing or decreasing the supply amount of the gas fuel or the liquid fuel, the supply amount of the combustion air supplied through the combustion air supply path Ls should be adjusted according to the supply amount of the gas fuel or the liquid fuel. become.

[Another Embodiment]
Next, another embodiment will be described. Since this other embodiment shows another embodiment of the burner tip portion and the other configurations are the same as those of the above embodiment, the above embodiment Only the part different from the above will be described, and the description of the part having the same configuration as that of the above embodiment will be omitted.

In the above embodiment, the case where the gas fuel ejection path 12 and the tip end side portion of the combustion air supply path Ls are formed in a form parallel to the burner axis along the longitudinal direction of the burner has been illustrated, but in this other embodiment, As shown in FIG. 4, the tip side portions of the gas fuel ejection path 12 and the combustion air supply path Ls are formed in an inclined shape located inward in the radial direction toward the tip end side of the burner.

In this way, the diameter of the tip of the burner can be reduced by forming the tip side of the gas fuel ejection path 12 and the combustion air supply path Ls in an inclined shape located inward in the radial direction toward the tip of the burner. It is possible to improve the installability of the type 2 fuel burner B, for example, the diameter of the opening formed in the furnace wall R for mounting the type 2 fuel burner B can be reduced.

[Other Other Embodiments]
Next, other other embodiments are listed.
(1) In the above embodiment, the liquid fuel ejection unit D atomizes the liquid fuel ejected from the tip of the liquid fuel supply path Ln with the atomizing air ejected from around the tip of the liquid fuel supply path Ln. For example, the liquid fuel is supplied to the inside of the atomization air supply path Lm and ejected in a mixed state of the liquid fuel and the atomization air. The specific configuration of the liquid fuel ejection part D can be variously changed, such as being configured to atomize the liquid fuel.

(2) In the above embodiment, the case where the gas fuel ejection path 12 is formed in the annular body 11 surrounding the liquid fuel ejection path D is illustrated, but the members forming the gas fuel ejection path 12 are arranged in the circumferential direction. In the form, the gas fuel ejection path 12 may be formed.

(3) In the above embodiment, the case where the gas fuel supply path Lg is formed in a tubular shape and the gas fuel ejection nozzle 14 is connected to the tip of the gas fuel supply path Lg is illustrated, but if the phases in the circumferential direction are different, It may be carried out in the form of providing a plurality of gas fuel supply paths Lg separately connected to each of the gas fuel ejection nozzles 14 to be positioned.

(4) In the above embodiment, the case where the type 2 fuel burner B is installed in the heating furnace is illustrated, but the type 2 fuel burner B can be applied to various heatings such as installation in a boiler, for example.

The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in the present specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

11 Annulus 12 Gas fuel ejection path 13 Air ejection hole 14 Gas fuel ejection nozzle D Liquid fuel ejection part E Communication part Lg Gas fuel supply path Ln Liquid fuel supply path Lm Atomization air supply path Ls Combustion air supply path N Combustion Space Vg Gas fuel adjustment unit Vn Liquid fuel adjustment unit Vm Atomization air adjustment unit Vs Combustion air adjustment unit

Claims (5)

A type 2 fuel burner that burns gaseous fuel and atomized liquid fuel in the combustion space.
The liquid fuel supplied through the liquid fuel supply path is atomized by the atomizing air supplied through the atomization air supply path to the center of the burner, and the atomized liquid fuel is ejected into the combustion space. A liquid fuel ejection part is provided to
A tubular combustion air supply path for supplying combustion air to the combustion space is provided on the outer periphery of the burner through an annular air ejection hole at the tip.
The gas fuel ejection path on the tip side of the burner that ejects the gas fuel into the combustion space and the gas fuel supply path are supplied to a portion corresponding to the space between the liquid fuel ejection section and the combustion air supply path. A gas fuel ejection nozzle for ejecting gaseous fuel into the gaseous fuel ejection path is provided, and the liquid fuel ejection portion, the gaseous fuel ejection path, and the air ejection hole are provided from the center of the burner toward the outer periphery. It is configured to be lined up
A communication portion is formed to introduce a part of the air flowing through the combustion air supply path into the negative pressure space between the gas fuel ejection path and the gaseous fuel ejection nozzle .
The liquid fuel supply path formed by the liquid fuel supply pipe along the burner axis direction is formed by the inner pipe along the burner axis direction in which the liquid fuel supply pipe is arranged inside. Located inside the road,
The liquid fuel ejection portion is configured to atomize the liquid fuel ejected from the tip of the liquid fuel supply path with the atomizing air ejected from the periphery of the tip of the liquid fuel supply path. There are two types of fuel burners. A plurality of gas fuel ejection passages are provided in an annular body surrounding the liquid fuel ejection portion at intervals in the circumferential direction.
The type 2 fuel burner according to claim 1, wherein the gas fuel ejection nozzle is provided corresponding to each of the plurality of the gaseous fuel ejection passages. The type 2 fuel burner according to claim 1 or 2, wherein the gas fuel ejection path and the tip end side portion of the combustion air supply path are formed in an inclined shape located inward in the radial direction toward the tip end side of the burner. A liquid fuel adjusting unit that adjusts the supply amount of the liquid fuel, an atomizing air adjusting unit that adjusts the supply amount of the atomizing air, a gaseous fuel adjusting unit that adjusts the supply amount of the gaseous fuel, and the combustion. The type 2 fuel burner according to any one of claims 1 to 3, wherein a combustion air adjusting unit for adjusting a supply amount of fuel is provided. The type 2 fuel burner according to any one of claims 1 to 4, wherein the combustion space is formed in a truncated cone shape whose diameter increases toward the tip side.

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