JP4697090B2 - Two-fluid spray burner - Google Patents

Description

  The present invention relates to a two-fluid spray burner that burns liquid fuel in an atomized state with an atomizing gas.

  The two-fluid spray burner burns liquid fuel in an atomized state with an atomizing gas, and is used, for example, as a heat source for a reformer of a fuel power generation system.

  In the conventional two-fluid spray burner, the liquid fuel is supplied from the pump of the liquid fuel supply system via the liquid fuel supply pipe and flows out from the tip of the liquid fuel supply pipe. Then, the liquid fuel flowing out from the liquid fuel supply pipe is mixed with atomizing air to atomize and burn the liquid fuel.

Japanese Patent Laid-Open No. 2002-224592

  However, the conventional two-fluid spray burner is designed on the assumption that the supply flow rate of liquid fuel from the pump is large. For this reason, when used in a state where the supply flow rate of the liquid fuel is small, the liquid fuel supply pipe 1 as illustrated in FIG. 14A is obtained by intermittent (oscillating) supply of liquid fuel from the pump. From the front end portion 1A, liquid fuel flows out intermittently. Therefore, as illustrated in FIG. 14B, the supply flow rate of the liquid fuel greatly fluctuates. For this reason, it becomes difficult to establish a stable combustion because the liquid fuel cannot be stably supplied, and there is a possibility that unburned exhaust gas is generated or misfire occurs.

  As a countermeasure, it may be possible to improve the pump performance of the liquid fuel supply system so that stable fuel supply can be achieved even at a low flow rate. However, such a countermeasure requires an expensive pump, which increases the cost of the apparatus. Will be invited.

  Therefore, in view of the above circumstances, the present invention has an object to provide a two-fluid spray burner that can stably supply liquid fuel without causing large fluctuations in the liquid fuel supply flow rate even when the liquid fuel supply flow rate is low. And

The two-fluid spray burner of the first invention that solves the above problems is a two-fluid spray burner that atomizes liquid fuel with an atomizing gas and burns it.
It has a cylindrical side portion and a bottom portion provided at the lower end of the side portion, stores liquid fuel supplied from a liquid fuel supply pipe, and is positioned below the liquid level of the stored liquid fuel. A liquid fuel tank configured to discharge the stored liquid fuel from one or a plurality of liquid fuel outflow holes opened in a side portion or the bottom portion;
The liquid fuel that has flowed out of the liquid fuel outflow hole of the liquid fuel tank is atomized with the atomizing gas and burned.

The two-fluid spray burner of the second invention is the two-fluid spray burner of the first invention.
The liquid fuel outflow hole is opened at the bottom of the liquid fuel tank,
A cylindrical atomizing gas flow path formed between a side of the liquid fuel tank and an outer cylinder surrounding the side;
The nozzle main body portion is provided at the lower end portion of the outer cylinder, has a lower nozzle body portion and an upper atomizing gas introduction portion, and the two-fluid merge space portion located below the liquid fuel outflow hole. And at the center of the atomizing gas introduction part, one or more spray holes communicating with the two-fluid merge space part are formed in the nozzle body part, and the atomizing gas flow path and the A two-fluid spray nozzle having a configuration in which one or a plurality of grooves communicating with a two-fluid merge space portion is formed in the atomizing gas introduction portion;
With
The liquid fuel tank is installed on the atomizing gas introduction part,
After the liquid fuel flowing out from the liquid fuel outflow hole and flowing into the two-fluid merging space portion flows downward in the atomizing gas flow path, the liquid fuel flows through the groove in the atomizing gas introduction portion, and The atomizing gas guided to the two-fluid merging space is merged with the two-fluid merging space, and then sprayed from the spray hole together with the atomizing gas.

The two-fluid spray burner of the third invention is the two-fluid spray burner of the second invention.
A tapered surface portion is formed on the lower surface of the bottom portion of the liquid fuel tank,
And the tapered surface part is formed also in the upper surface of the gas introduction part for atomization,
The liquid fuel tank is installed on the atomizing gas introducing portion in a state where the tapered surface portion of the liquid fuel tank is in contact with the tapered surface portion of the atomizing gas introducing portion. Features.

The two-fluid spray burner of the fourth invention is the two-fluid spray burner of the first invention,
The liquid fuel outflow hole is opened at the bottom of the liquid fuel tank,
A cylindrical atomizing gas flow path formed between a side of the liquid fuel tank and an outer cylinder surrounding the side;
A two-fluid merging space portion provided at a lower end portion of the outer cylinder and positioned below the liquid fuel outflow hole is formed in a central portion, and one or a plurality of spray holes communicating with the two-fluid merging space portion are provided. A two-fluid spray nozzle with a formed configuration;
With
A tapered surface portion is formed on the lower surface of the bottom portion of the liquid fuel tank,
In addition, a tapered surface portion is formed on the upper surface of the two-fluid spray nozzle,
The liquid fuel tank is installed on the two-fluid spray nozzle in a state where the tapered surface portion of the liquid fuel tank is in contact with the tapered surface portion of the two-fluid spray nozzle.
At the bottom of the liquid fuel tank, one or a plurality of grooves communicating the atomizing gas flow path and the two-fluid merge space portion are formed,
After the liquid fuel flowing out from the liquid fuel outflow hole and flowing into the two-fluid merging space flows downward through the atomizing gas flow path, the liquid fuel flows through the groove at the bottom of the liquid fuel tank, and the second An atomizing gas guided to the fluid merging space and the two-fluid merging space are merged and then sprayed from the spray hole together with the atomizing gas.

Further, the two-fluid spray burner of the fifth invention is the two-fluid spray burner of any of the second to fourth inventions,
The two-fluid merging space is circular when viewed from above.
The groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is formed so as to be along the tangential direction of the circumference of the two-fluid merge space part in a top view.

Moreover, the two-fluid spray burner of the sixth invention is the two-fluid spray burner of any of the second to fourth inventions,
The two-fluid merging space is circular when viewed from above.
The groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is formed so as to be along the radial direction of the two-fluid merging space part in a top view.

  Further, the two-fluid spray burner of the seventh invention is the two-fluid spray burner of the fifth or sixth invention, wherein the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is the two-fluid merging space. A plurality of portions are formed so as to have a rotationally symmetrical positional relationship around the central axis of the portion.

Moreover, the two-fluid spray burner of the eighth invention is the two-fluid spray burner of the second to seventh inventions,
By including a pressing member that presses the liquid fuel tank downward,
The bottom of the liquid fuel tank was configured to be pressed against the atomizing air introducing portion of the two-fluid spray nozzle,
Alternatively, the bottom of the liquid fuel tank is configured to be pressed against the two-fluid spray nozzle,
It is characterized by.

Moreover, the two-fluid spray burner of the ninth invention is the two-fluid spray burner of the first invention,
The liquid fuel outflow hole is opened at the bottom of the liquid fuel tank,
A cylindrical first atomizing gas flow path formed between a side portion of the liquid fuel tank and an outer cylinder surrounding the side portion;
A two-fluid merging space portion provided at a lower end portion of the outer cylinder and positioned below the liquid fuel outflow hole is formed in a central portion, and one or a plurality of spray holes communicating with the two-fluid merging space portion are provided. A two-fluid spray nozzle with a formed configuration;
With
A tapered surface portion is formed on the upper surface of the two-fluid spray nozzle,
A tapered surface portion is also formed on the lower surface of the bottom portion of the liquid fuel tank,
A plurality of support portions project from the side portion of the liquid fuel tank, and a tapered surface portion is formed on the lower surface of these support portions,
The liquid fuel tank is installed on the two-fluid spray nozzle in a state in which the tapered surface portion of the support portion is in contact with the tapered surface portion of the two-fluid spray nozzle.
A gap secured between the tapered surface portion of the liquid fuel tank and the tapered surface portion of the two-fluid spray nozzle by the support portion as a second atomizing gas flow path,
After the liquid fuel that has flowed out of the liquid fuel outflow hole and has flowed into the two-fluid merging space portion flows downward through the first atomizing gas flow path, the atomizing gas flow between the support portions The atomizing gas that has passed through the part and flows through the second atomizing gas flow path and led to the two-fluid merging space part, and the two-fluid merging space part, It is characterized by being configured to be sprayed from the spray hole together with gas.

Moreover, the two-fluid spray burner of the tenth invention is the two-fluid spray burner of any of the second to ninth inventions,
The two-fluid merging space portion has an inverted conical shape, and the spray hole is formed at the apex position of the inverted conical space portion.

The two-fluid spray burner according to the eleventh aspect of the present invention is the two-fluid spray burner according to any one of the second to tenth aspects,
A cylindrical gaseous fuel flow path formed between the outer cylinder and a gaseous fuel supply pipe surrounding the outer cylinder;
The gaseous fuel is configured to flow downward in the gaseous fuel flow path and to be injected and burned from the lower end of the gaseous fuel flow path.

Moreover, the two-fluid spray burner of the twelfth invention is the two-fluid spray burner of any of the first to eleventh inventions,
A tip portion of the liquid fuel supply pipe is in contact with an inner peripheral surface of a side portion of the liquid fuel tank.

  The two-fluid spray burner according to any one of the first to second inventions may further include the following configuration.

That is, the two-fluid spray burner of the first configuration is the two-fluid spray burner of any one of the first to second inventions, and the combustion below the two-fluid spray nozzle from the two-fluid spray nozzle of the two-fluid sprayer. In the burner that sprays liquid fuel into the space and burns it,
A cylindrical combustion air flow path formed between the two-fluid sprayer and a burner outer cylinder surrounding the two-fluid sprayer;
A shielding plate that partitions the combustion air flow path and the combustion space portion;
A combustion air circulation hole provided on the outer peripheral side of the shielding plate;
With
Combustion air that has flowed downward through the combustion air flow path is blocked by the shielding plate and guided to the outer peripheral side of the shielding plate, so that the combustion air flows away from the fuel injection nozzle. The structure is characterized in that it passes through the hole and flows into the combustion space.

Further, the two-fluid spray burner having the second configuration is the two-fluid spray burner having the first configuration.
A combustion air supply delay cylinder that extends downward from the lower surface of the shield plate is provided, and another cylindrical combustion air flow that communicates with the combustion air circulation hole between the cylinder and the burner outer cylinder. Form a road,
The combustion air that has passed through the combustion air flow hole flows into the combustion space from the lower end of the other combustion air flow channel after flowing downward through the other combustion air flow channel. It is characterized by that.

Moreover, the two-fluid spray burner having the third configuration is the two-fluid spray burner having the second configuration.
One or a plurality of stagnation prevention cylinders extending downward from the lower surface of the shielding plate are provided inside the combustion air supply delay cylinder.

Moreover, the two-fluid spray burner of the fourth configuration is the two-fluid spray burner of any of the first to third configurations.
A plurality of other combustion air circulation holes are formed in the shielding plate inside the combustion air circulation holes.

  According to the two-fluid spray burner of the first invention, it has a cylindrical side part and a bottom part provided at the lower end of the side part, and stores the liquid fuel supplied from the liquid fuel supply pipe and stores the stored liquid. A liquid fuel tank configured to discharge the stored liquid fuel from one or a plurality of liquid fuel outflow holes which are located below the liquid level of the fuel and opened in the side portion or the bottom portion; Even when liquid fuel is intermittently supplied from the liquid fuel supply pipe to the liquid fuel tank, the liquid fuel flowing out from the liquid fuel outflow hole of the tank is atomized with the atomizing gas and burned. The liquid fuel stored in the liquid fuel tank continuously flows out from the liquid fuel outflow hole of the liquid fuel tank. That is, even when the supply flow rate of the pump of the liquid fuel supply system decreases and liquid fuel is intermittently supplied from the liquid fuel supply pipe to the liquid fuel tank, the liquid level of the liquid fuel stored in the liquid fuel tank However, the flow rate of the liquid fuel from the liquid fuel outflow hole slightly fluctuates slightly, and the flow rate of the liquid fuel supply flow rate does not fluctuate. For this reason, even when the liquid fuel supply flow rate is low, it becomes possible to stably supply the liquid fuel, and it becomes easy to establish stable combustion, and there is no possibility that unburned exhaust gas is generated or misfire occurs.

  According to the two-fluid spray burner of the second invention, the liquid fuel that has flowed out of the liquid fuel outflow hole and flowed into the two-fluid merging space portion flows downward through the atomizing gas flow path, and then the mist The atomizing gas introduced into the two-fluid merging space by flowing through the groove in the atomizing gas introducing portion and merged in the two-fluid merging space, and then sprayed from the spray hole together with the atomizing gas Since the liquid fuel is well mixed in the two-fluid merging space with the atomizing gas whose velocity is increased in the groove (the velocity component in the horizontal direction is increased) in the groove, it is injected from the spray hole of the two-fluid spray nozzle Will be. For this reason, compared with the case where the two-fluid merging space portion and the groove are not provided, the spread angle of the spray of the liquid fuel is increased and the liquid fuel is reliably atomized, so that the combustibility of the liquid fuel is improved.

  According to the two-fluid spray burner of the third aspect of the invention, the liquid fuel tank is in the state in which the tapered surface portion of the liquid fuel tank is in contact with the tapered surface portion of the atomizing gas introducing portion so as to be fitted. It is easy to match the central axis of the liquid fuel tank and the two-fluid spray nozzle because it is installed on the gas introduction section. Accordingly, there is no deviation of the liquid fuel tank, the width of the atomizing gas channel is made uniform in the circumferential direction, and the flow of the atomizing gas in the atomizing gas channel is made uniform in the circumferential direction. Therefore, the symmetry of the spray of the liquid fuel from the spray hole of the two-fluid spray nozzle (that is, the symmetry of the flame) can be ensured.

  According to the two-fluid spray burner of the fourth aspect of the invention, the liquid fuel that has flowed out of the liquid fuel outflow hole and flowed into the two-fluid merging space portion flows down the atomizing gas flow path and then the liquid The atomizing gas that has flowed through the groove at the bottom of the fuel tank and led to the two-fluid merging space is merged with the two-fluid merging space, and is then sprayed from the spray hole together with the atomizing gas. With this configuration, the liquid fuel is well mixed in the two-fluid merging space with the atomizing gas whose velocity is increased in the groove (the velocity component in the horizontal direction is increased) and sprayed from the spray hole. . For this reason, compared with the case where the two-fluid merging space portion and the groove are not provided, the spread angle of the spray of the liquid fuel is increased and the liquid fuel is reliably atomized, so that the combustibility of the liquid fuel is improved.

  Further, the liquid fuel tank is installed on the two-fluid spray nozzle in a state where the tapered surface portion of the liquid fuel tank is in contact with the tapered surface portion of the two-fluid spray nozzle so as to be fitted, It is easy to align the central axis of the liquid fuel tank and the two-fluid spray nozzle. Accordingly, there is no deviation of the liquid fuel tank, the width of the atomizing gas channel is made uniform in the circumferential direction, and the flow of the atomizing gas in the atomizing gas channel is made uniform in the circumferential direction. Therefore, the symmetry of the spray of the liquid fuel from the spray hole of the two-fluid spray nozzle (that is, the symmetry of the flame) can be ensured.

  According to the two-fluid spray burner of the fifth invention, the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is along the tangential direction of the circumference of the two-fluid merge space part in a top view. Since the atomizing gas is swirled in the two-fluid merging space and mixed with the liquid fuel, the liquid fuel and the atomizing gas are more reliably mixed. For this reason, the liquid fuel injected from the spray hole of the two-fluid spray nozzle can be atomized more reliably, and the combustibility of the liquid fuel can be further improved.

  According to the two-fluid spray burner of the sixth aspect of the invention, the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is formed along the radial direction of the two-fluid merge space part in a top view. Thus, in the two-fluid merging space, the atomizing gas is mixed with the liquid fuel so as to collide with the liquid fuel, so that the liquid fuel and the atomizing gas are more reliably mixed. For this reason, the liquid fuel injected from the spray hole of the two-fluid spray nozzle can be atomized more reliably, and the combustibility of the liquid fuel can be further improved.

  According to the two-fluid spray burner of the seventh invention, the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank has a rotationally symmetrical positional relationship around the central axis of the two-fluid merge space part. Thus, the plurality of liquid fuel spray nozzles are formed, so that the distribution amount of the liquid fuel sprayed from the spray holes of the two-fluid spray nozzle can be made uniform, and the combustibility of the liquid fuel can be improved.

  According to the two-fluid spray burner of the eighth invention, the bottom of the liquid fuel tank is pressed against the atomizing air introducing portion of the two-fluid spray nozzle by providing a pressing member that presses the liquid fuel tank downward. Or the bottom of the liquid fuel tank is pressed against the two-fluid spray nozzle to make contact with the bottom surface of the bottom of the fuel tank. The top surface of the gas introduction part is in close contact, the tapered surface part of the bottom of the fuel tank and the tapered surface part of the atomizing gas introduction part are in close contact, or the tapered surface part of the liquid fuel tank and the tapered surface part of the two-fluid spray nozzle are in close contact. Therefore, it is possible to prevent a gap from being formed between these contact surfaces. For this reason, it can prevent that the gas for atomization flows through parts other than a groove | channel, and can fully exhibit the effect of the wide spray by a groove | channel.

  According to the two-fluid spray burner of the ninth invention, the liquid fuel that has flowed out of the liquid fuel outflow hole and flowed into the two-fluid merging space portion has flowed downward through the first atomizing gas flow path. The atomizing gas that has passed through the atomizing gas flow part between the support parts and then flowed through the second atomizing gas flow path and led to the two-fluid merge space part, and the two fluids The two-fluid spray nozzle is used after the liquid fuel is mixed with the atomizing gas in the two-fluid merging space by being configured to be sprayed from the spray hole together with the atomizing gas after merging in the merging space. It will be sprayed from the spray hole. For this reason, compared with the case where the two-fluid merging space portion is not provided, the spread angle of the spray of the liquid fuel is increased and the liquid fuel is reliably atomized, so that the combustibility of the liquid fuel is improved.

  According to the two-fluid spray burner of the tenth aspect of the invention, the two-fluid merging space portion has an inverted conical shape, and the spray hole is formed at the apex position of the inverted conical space portion. Mixing of the liquid fuel and the atomizing gas in the section can be performed more reliably. For this reason, the liquid fuel sprayed from the spray hole can be atomized more reliably to further improve the combustibility of the liquid fuel.

  According to the two-fluid spray burner of the eleventh aspect of the invention, it is provided with a cylindrical gaseous fuel flow path formed between the outer cylinder and a gaseous fuel supply pipe surrounding the outer cylinder, and the gaseous fuel is the gas By flowing downward through the fuel flow path and being injected and burned from the lower end of the gaseous fuel flow path, the gaseous fuel injected from the cylindrical gaseous fuel flow path is uniform in the circumferential direction. Therefore, the combustibility is improved, and for example, when the amount of liquid fuel supplied is small, the flame holding effect by the gaseous fuel is exhibited.

  According to the two-fluid spray burner of the twelfth aspect of the invention, since the tip of the liquid fuel supply pipe is in contact with the inner peripheral surface of the side part of the liquid fuel tank, the amount of liquid fuel flowing out from the liquid fuel supply pipe Even when the amount of the liquid fuel is small, the liquid fuel flows down along the inner peripheral surface, so that the outflow of the liquid fuel from the liquid fuel outflow hole can be further stabilized. That is, when the liquid fuel drops in a granular form, the liquid level of the liquid fuel stored in the liquid fuel tank fluctuates greatly, and when the liquid level is very low, the liquid fuel outflow hole is temporarily exposed. It is conceivable that the outflow of the liquid fuel may be interrupted, but if the liquid fuel is allowed to flow down along the inner peripheral surface of the liquid fuel tank, the occurrence of such a problem can be prevented.

  Further, according to the two-fluid spray burner having the first configuration, the combustion air flowing downward through the combustion air flow path is blocked by the shielding plate and guided to the outer peripheral side of the shielding plate. Accordingly, the fuel injection nozzle is moved away from the fuel injection nozzle and passes through the combustion air circulation hole and flows into the combustion space portion, so that only a part of the combustion air is injected from the fuel injection nozzle in the combustion space portion. The remaining air for combustion flows further downward and is mixed with the combustion exhaust gas generated by the combustion. For this reason, the combustion air and fuel can be properly mixed by supplying combustion air once (one stage), and a large amount of combustion exhaust gas is generated without overcooling the flame. Can do. Accordingly, it is possible to realize a burner such as a two-fluid spray burner that can generate a large amount of combustion exhaust gas with a simple configuration and that does not cause generation of unburned gas or misfire.

  Furthermore, since the combustion air is caused to flow into the combustion space at a position away from the fuel injection nozzle by the shielding plate, the position where a part of the combustion air is supplied to the fuel can be moved downward from the shielding plate. . Accordingly, the position of the flame is also moved downward from the shielding plate, and soot can be prevented from adhering to the lower surface of the shielding plate. If the amount of soot adhering to the lower surface of the shielding plate increases, problems such as clogging of the fuel injection nozzle due to soot and abnormal heating of the fuel injector due to absorption of the radiant heat of the flame may occur. However, the occurrence of such defects can be prevented beforehand by preventing wrinkles from adhering to the lower surface of the shielding plate as described above.

  According to the two-fluid spray burner of the second configuration, a combustion air supply delay cylinder extending downward from the lower surface of the shielding plate is provided, and the combustion air is provided between the cylinder and the burner outer cylinder. Form another cylindrical combustion air flow path that communicates with the flow hole, and after the combustion air that has passed through the combustion air flow hole flows downward through the other combustion air flow path, Since it is configured to flow into the combustion space from the lower end of the combustion air flow path, a part of the combustion air can be delayed from being supplied to the fuel injected from the fuel injection nozzle. That is, the position where a part of the combustion air is supplied to the fuel can be moved downward from the shielding plate. Accordingly, the position of the flame is also moved downward from the shielding plate, and soot can be prevented from adhering to the lower surface of the shielding plate. The effect of moving the position where a part of the combustion air is supplied to the fuel downward from the shielding plate can be obtained only by providing the shielding plate as described above. However, as in the second invention, the combustion air is provided. If the supply delay cylinder is provided, the position where a part of the combustion air is supplied to the fuel can be moved away from the shielding plate more reliably.

  Further, in the first configuration, when the distance from the fuel injection nozzle to the combustion air circulation hole cannot be sufficiently increased due to the restriction of the size of the burner and the like, the shielding plate cannot be made too large. In some cases, the amount of combustion air supplied to the fuel becomes too large, and the flame may be excessively cooled. On the other hand, if a cylinder for delaying the supply of combustion air is provided as in the second configuration, not only the position where a part of the combustion air is supplied to the fuel can be moved away from the shielding plate but also downward. At this time, a part of the combustion air supplied to the fuel can be reduced to an appropriate amount. Therefore, from this point of view, it is effective to provide the cylinder as in the second aspect of the invention. By providing the cylinder, the shielding plate can be made small, and the burner can be downsized.

  According to the two-fluid spray burner of the third configuration, one or a plurality of stagnation prevention cylinders extending downward from the lower surface of the shielding plate are provided inside the combustion air supply delay cylinder. The stagnation prevention cylinder can prevent the fuel stagnation (convection) from occurring near the lower surface of the shielding plate. For this reason, it can prevent that the fuel which stagnates in the lower surface vicinity of a shielding board is ignited, and a soot adheres to the lower surface of a shielding board.

  According to the four-fluid spray burner of the fourth configuration, a part of the combustion air is formed in the shielding plate by forming a plurality of other combustion air circulation holes inside the combustion air circulation hole. However, since these other combustion air circulation holes also pass, it is possible to suppress the occurrence of a stagnation flow of combustion air in the vicinity of the lower surface of the shielding plate due to the flow of the combustion air. It is possible to suppress soot from adhering. Further, since the low-temperature combustion air flows in the vicinity of the fuel injection nozzle through the other combustion air circulation hole, the fuel injection nozzle that is easily overheated by the radiant heat of the flame can be cooled by the combustion air. An effect is also obtained.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

<Embodiment 1>
1 is a longitudinal sectional view showing a configuration of a two-fluid spray burner according to Embodiment 1 of the present invention, FIG. 2 is a transverse sectional view taken along line AA in FIG. 1, and FIG. 3 is B- in FIG. It is a cross-sectional view of B line arrow. 4 (a) is an enlarged longitudinal sectional view showing the two-fluid sprayer provided in the two-fluid spray burner of FIG. 1, and FIG. 4 (b) is a view taken along the line CC in FIG. 4 (a). FIG. 5A is an enlarged vertical sectional view showing a lower portion of the two-fluid sprayer, and FIG. 5B is an upper view showing an extracted two-fluid spray nozzle provided in the two-fluid sprayer. It is a figure (D direction arrow line view of Fig.5 (a)).

  The outline of the two-fluid spray burner 11 according to the first embodiment will be described with reference to FIGS. 1, 2, and 3. The two-fluid spray burner 11 has a burner outer cylinder 48, and this burner outer cylinder. A two-fluid sprayer 12 is disposed in the upper central portion in 48, and a lower side of the two-fluid sprayer 12 serves as a combustion space portion 13. A gaseous fuel supply passage 14 is formed around the two-fluid sprayer 12, and a combustion air supply passage 15 is formed around the gaseous fuel supply passage 14. The combustion air supply passage 15 and the combustion space portion 13 are partitioned by a plate 18 as a shielding plate, and a first cylinder as a cylinder for delaying the supply of combustion air is formed on the lower surface of the plate 18. 16 and a second cylinder 17 as a stagnation-preventing cylinder.

  Based on FIG.4 and FIG.5, the structure of the two-fluid sprayer 12 is explained in full detail. The two-fluid sprayer 12 injects two fluids of liquid fuel and atomizing gas (atomizing air), that is, the liquid fuel is atomized with the atomizing gas and injected.

  As shown in FIGS. 4 and 5, the two-fluid sprayer 12 includes a liquid fuel tank 19. The liquid fuel tank 19 has a structure having a cylindrical side portion (body portion) 20 and a bottom portion 21 provided at the lower end of the side portion 20. A liquid fuel 24 for burner combustion is stored inside the liquid fuel tank 19, and a fine liquid fuel outflow hole 22 is formed in the center of the bottom 21 of the liquid fuel tank 19. The liquid fuel outflow hole 22 is located below the liquid level 23 of the liquid fuel 24 stored in the liquid fuel tank 19.

  That is, the liquid fuel 24 supplied from the liquid fuel supply pipe 25 is temporarily stored in the liquid fuel tank 19, and the stored liquid fuel 24 is discharged from the lower liquid fuel outflow hole 22 to the outside of the liquid fuel tank 19. To come out. At this time, the height of the liquid level 23 of the liquid fuel 24 stored in the liquid fuel tank 19 (the height from the inner surface 21a of the bottom 21 to the liquid level 23) is such that the liquid fuel 24 flows through the liquid fuel outflow hole 22. The height of the liquid column head (details will be described later) corresponding to the pressure loss during As the liquid fuel 24 for burning the burner, for example, kerosene, heavy oil, alcohol, ether or the like can be used.

  The liquid fuel supply pipe 25 has a leading end (lower end) 25A inserted into the liquid fuel tank 19 downward from the upper end of the liquid fuel tank 19, and above the liquid level 23 in the liquid fuel tank 19. And it is arrange | positioned so that it may be located in a center part. The base end side of the liquid fuel supply pipe 25 is connected to a liquid fuel supply pump of a liquid fuel supply system (not shown).

  5A, the tip end portion 25A of the liquid fuel supply pipe 25 may be in contact with the inner peripheral surface 20a of the side portion 20 of the liquid fuel tank 19. When the supply flow rate of the liquid fuel 24 is small, when the tip 25A of the liquid fuel supply pipe 25 is separated from the inner peripheral surface 20a of the liquid fuel tank 19, the liquid fuel 24 becomes granular as shown in the illustrated example. Although falling, when the tip 25A of the liquid fuel supply pipe 25 is in contact with the inner peripheral surface 20a of the liquid fuel tank 19, the liquid fuel 24 flows down along the inner peripheral surface 20a.

  The liquid fuel tank 19 is provided in a cylindrical sprayer outer cylinder 27 concentrically with the sprayer outer cylinder 27, and a cylindrical space between the side portion 20 of the liquid fuel tank 19 and the sprayer outer cylinder 27 is provided. The atomizing air flow path 28 is used as an atomizing gas flow path. An air inflow hole 29 is formed in the sprayer outer cylinder 27, and a tip portion 30 </ b> A of an atomizing air supply pipe 30 is connected to the air inflow hole 29. The proximal end side of the atomizing air supply pipe 30 is connected to an air supply blower of an atomizing air supply system (not shown).

  The two-fluid spray nozzle 38 is attached to the lower end portion 27 </ b> A of the sprayer outer cylinder 27 and is positioned below the liquid fuel tank 19. That is, the two-fluid sprayer 12 has a configuration in which the liquid fuel tank 19 is interposed between the liquid fuel supply pipe 25 and the two-fluid spray nozzle 38 as a buffer unit for reducing fluctuations in the liquid fuel supply flow rate. . The two-fluid spray nozzle 38 has a disk-shaped nozzle main body 39 and an atomizing air introducing portion 37 as an atomizing gas introducing portion formed on the nozzle main body 39. In the state where the peripheral edge of the upper surface of the nozzle body 39 is brought into contact with the lower end surface of the sprayer outer cylinder 27 and the atomizing air introduction part 37 is fitted inside the lower end 27A of the sprayer outer cylinder 27. It is fixed to the lower end portion 27A of the sprayer outer cylinder 27 by fixing means such as welding.

  The atomizing air introduction portion 37 is formed in an annular shape, and has a space portion 41 having a circular shape in plan view (top view) at the center thereof. The nozzle body 39 has an inverted conical space (recessed portion) 42 formed at the center thereof, and a fine spray hole 44 is formed at the center (vertical position of the inverted conical space 42). ing. The space part 41 of the atomizing air introduction part 37 and the space part 42 of the nozzle main body part 39 are continuous, and these space parts 41, 42 constitute a two-fluid merge space part 43. That is, the two-fluid merge space 43 has a circular shape when viewed from above, and has a tapered structure in which the diameter gradually decreases toward the spray hole 44. The atomizing air introducing portion 37 has grooves (slits) 40 formed at two locations in the circumferential direction. These grooves 40 are of a swivel type, are along the tangential direction of the circumference of the two-fluid merge space 43 in a top view, and are center axes of the two-fluid merge space 43 (in the illustrated example, the center of the spray hole 44). The positional relationship is rotationally symmetric (equally spaced in the circumferential direction).

  On the other hand, the upper end portion 27B of the sprayer outer cylinder 27 is closed by a cap 31 as a closing member for preventing leakage of the atomizing air from the inside of the sprayer outer cylinder 27 to the outside. The cap 31 has an upper end of the sprayer outer cylinder 27 by screwing a screw part 33 formed on the outer peripheral surface of the lower part 31 </ b> A with a screw part 32 formed on the inner peripheral surface of the upper end part 27 </ b> B of the sprayer outer cylinder 27. It is attached to the portion 27B. An O-ring 34 is interposed between the step portion 31B of the cap 31 and the upper end portion 27B of the sprayer outer cylinder 27 in order to reliably prevent the atomization air from leaking. The distal end portion 25A of the liquid fuel supply pipe 25 passes through the cap 31 and is inserted into the liquid fuel tank 19 from the upper end of the liquid fuel tank 19 through the inside of the sprayer outer cylinder 27 (inside the coil spring 36).

  A coil spring 36 as a pressing member is interposed between the washer 35 provided on the lower surface side of the cap 31 and the washer 26 provided on the upper end side of the liquid fuel tank 19. By pressing the liquid fuel tank 19 downward by the coil spring 36, the outer surface (lower surface) 21 b of the bottom portion 21 of the liquid fuel tank 19 is pressed against the upper surface 37 a of the atomizing air introduction portion 37. As a result, the outer surface (lower surface) 21b of the bottom portion 21 and the upper surface 37a of the two-fluid spray nozzle 38 (atomization air introducing portion 37) are in close contact with each other, and a gap is formed between these contact surfaces 21b and 37a. Is prevented from occurring.

  A gap 45 is provided between the washer 26 and the liquid fuel supply pipe 25, and the internal space of the liquid fuel tank 19 and the internal space of the sprayer outer cylinder 27 outside the liquid fuel tank 19 are provided via the gap 45. And communicate with each other. That is, the upper end of the liquid fuel tank 19 is opened to the inner space of the sprayer outer cylinder 27, and the inner space of the liquid fuel tank 19 and the upper end portion (upstream portion) of the atomizing air flow path 28 communicate with each other. . For this reason, the pressure of the atomizing air 46 that flows into the atomizer outer cylinder 27 from the air inflow hole 29 and flows into the atomizing air flow path 28 is applied to the liquid fuel 24 stored in the liquid fuel tank 19. It also acts on the liquid level 23.

  In the two-fluid sprayer 12, when the burner combustion liquid fuel 24 sent from the liquid fuel supply pump through the liquid fuel supply pipe 25 flows out from the tip 25A of the liquid fuel supply pipe 25 (relatively high flow rate). In this case, the liquid flows out continuously, and in the case of a relatively low flow rate, when it flows out intermittently as illustrated in FIG. Then, the liquid fuel 24 stored in the liquid fuel tank 19 continuously flows out from the liquid fuel outflow hole 22 at the bottom 21 of the liquid fuel tank 19 to the two-fluid merge space 43. If the liquid fuel flows out from the tip 25A of the liquid fuel supply pipe 25 intermittently, the liquid level 23 rises when the liquid fuel 24 flows out of the tip 25A of the liquid fuel supply pipe 25. Then, until the liquid fuel 24 flows out from the front end portion 25A of the liquid fuel supply pipe 25, the phenomenon that the liquid level 23 decreases is repeated, and the liquid fuel 24 flows out of the liquid fuel outflow hole 22 depending on the liquid level fluctuation. Although the flow rate of the liquid fuel 24 to be changed also varies, this flow rate variation is slight compared with the conventional flow rate variation.

  On the other hand, the atomizing air 46 sent from the air supply pump through the atomizing air supply pipe 30 flows into the atomizer outer cylinder 27 from the air inflow hole 29, and the liquid fuel tank 19 and the atomizer outer cylinder 27 are introduced. Flows downward in the atomizing air flow path 28 between them. After that, the atomizing air 46 is introduced into the two-fluid merging space 43 in a state where the flow velocity is increased by flowing through the groove 40 of the atomizing air introducing portion 37 in the two-fluid spray nozzle 38, A swirling flow is formed in the space 43 and merges (mixes) with the liquid fuel 24 flowing out from the liquid fuel outflow hole 22 of the liquid fuel tank 19. As a result, the liquid fuel 24 and the atomizing air 46 are well mixed, and the liquid fuel 24 is atomized by the atomizing air 46 together with the atomizing air 46 from the spray hole 44 of the two-fluid spray nozzle 38. The fuel is injected into the combustion space 13 (flame) and burned. The initial ignition of the atomized liquid fuel 24 is performed by the spark plug 54.

Here, the liquid column head H of the liquid fuel 24 stored in the liquid fuel tank 19 will be described in detail. The liquid column head H has a pressure loss ΔP (hole when the liquid fuel 24 flows through the liquid fuel outflow hole 22. ), The kinetic energy E of the liquid fuel 24 flowing out from the liquid fuel outflow hole 22, and the pressure loss ΔPair of the atomizing air 49 in the groove 40 or the like, can be obtained by the following equation.
Liquid column head H = pressure loss ΔP (hole) + kinetic energy E−pressure loss ΔPair
The kinetic energy E can be obtained from the flow velocity v of the liquid fuel 24 and the density ρ of the liquid fuel 24 by the following equation.
Kinetic energy = ρv ^2/2

  Further, the height of the liquid level 23 of the stored liquid fuel 24 in the liquid fuel tank 19 varies depending on the flow rate of the liquid fuel 24 supplied to the liquid fuel tank 19 via the liquid fuel supply pipe 25. That is, when the output of the fuel supply pump is adjusted and the supply flow rate of the liquid fuel 24 is increased, the liquid level 23 is increased, and when the supply flow rate of the liquid fuel 24 is decreased, the liquid level 23 is decreased. Accordingly, the height of the liquid fuel tank 19 is set to a height corresponding to a change in the height of the liquid level 23 according to the adjustment range of the supply flow rate of the predetermined liquid fuel 24.

  Further, the liquid fuel 24 is sprayed in a conical shape from the spray hole 44 as illustrated in FIG. 5A, and the spread (spray angle) of the spray at this time is the cross-sectional area of the groove 40 (that is, the groove 40 circulates). The flow rate of the atomizing air 46 at the time of spraying), the size of the spray hole 44 (that is, the hole diameter), and the like.

  Next, the configuration other than the two-fluid sprayer 12 will be described in detail. As shown in FIGS. 1, 2, and 3, a cylindrical gaseous fuel supply pipe 47 is provided so as to surround the periphery of the sprayer outer cylinder 27. The gaseous fuel supply pipe 47 is provided concentrically with the sprayer outer cylinder 27, and a cylindrical space between the gaseous fuel supply pipe 47 and the sprayer outer cylinder 27 serves as the gaseous fuel flow path 14. The burner combustion gaseous fuel 49 supplied from the gaseous fuel supply system flows downward in the gaseous fuel flow path 14 and is injected from the lower end of the gaseous fuel flow path 14 into the combustion space 13 and burned. The liquid fuel 24 and the gaseous fuel 49 may be burned separately or simultaneously. As the gaseous fuel 49 for burning the burner, for example, methane, ethane, propane, butane, dimethyl ether, hydrogen or the like can be used. Further, when the two-fluid spray burner 11 is used as a heat source of the reformer, a fuel cell is used. The remaining reformed gas returned to the two-fluid spray burner 11 without being used for power generation can also be used (see FIG. 13).

  The burner outer cylinder 48 is cylindrical and surrounds the gaseous fuel supply pipe 47. The burner outer cylinder 48 and the gaseous fuel supply pipe 47 are provided concentrically, and the cylindrical space between the burner outer cylinder 48 and the gaseous fuel supply pipe 47 becomes the first combustion air flow path 15. ing. Accordingly, the combustion air 50 supplied from the air supply blower of the combustion air supply system flows downward in the combustion air flow path 15.

  A plate 18 is provided between the lower end of the combustion air flow path 15, that is, between the lower end of the gaseous fuel supply pipe 47 and the lower end of the burner outer cylinder 48. The plate 18 is an annular plate and partitions the combustion air flow path 15 and the combustion space portion 13. In this case, in the illustrated example, the plate 18 is installed at substantially the same height as the two-fluid spray nozzle 38, but the present invention is not limited thereto, and may be provided at a position higher than the two-fluid spray nozzle 38, for example. However, if the position of the plate 18 is increased, the first cylinder 16 and the second cylinder 17 need to be longer than the illustrated example. Therefore, the plate 18 is set to the same height as the two-fluid spray nozzle 38 as illustrated. However, it is the least expensive and reasonable.

  The inner peripheral surface of the plate 18 is fixed to the outer peripheral surface of the gaseous fuel supply pipe 47 by fixing means such as welding, while a plurality (four in the illustrated example) of protrusions 51 are formed on the outer peripheral surface of the plate 18. The tip surfaces of these protrusions 51 are fixed to the inner peripheral surface of the burner outer cylinder 48 by fixing means such as welding. Therefore, the gas fuel supply pipe 47 to the vicinity of the burner outer cylinder 48 is closed by the plate 18, but on the outer peripheral side of the plate 18, the outer peripheral surface of the plate 18 and the inner peripheral surface of the burner outer cylinder 48 are formed by the protrusions 51. Gaps are formed between the air holes 48 a and these air gaps serve as combustion air circulation holes 52. That is, the combustion air flow path 15 and the combustion space portion 13 are communicated with each other through these combustion air circulation holes 52.

  Accordingly, the combustion air 50 flows downward through the combustion air flow path 15, and then is blocked by the plate 18 and guided to the outer peripheral side of the plate 18, thereby keeping it away from the two-fluid spray nozzle 38 (spray hole 44). And flows into the combustion space 13 through the combustion air circulation hole 52.

  Further, an outer first cylinder 16 extending downward and an inner second cylinder 17 extending downward are fixed to the lower surface of the plate 18 by fixing means such as welding. The first cylinder 16 is located on the inner side of the combustion air circulation hole 52 and is arranged concentrically with the burner outer cylinder 48. A cylindrical space between the burner outer cylinder 48 and the first cylinder 16 serves as a second combustion air flow path 53.

  Accordingly, the combustion air 50 that has flowed downward through the first combustion air passage 15 and passed through the combustion air circulation hole 52 further flows downward through the second combustion air passage 53. Then, the combustion air 50 flows out from the lower end of the combustion air flow channel 53 and spreads over the entire combustion space portion 13. For this reason, a part (for example, about 30% of the whole) of the combustion air 50 flowing out from the combustion air flow path 53 is transferred to the liquid fuel 24 sprayed from the two-fluid sprayer 12 (two-fluid spray nozzle 38). It is supplied (mixed) at a position away from the plate 18 and used for combustion of the liquid fuel 24. At this time, the amount of the combustion air 50 mixed with the liquid fuel 24 is set so that, for example, the average of the air ratio is 1.5 or less. The remainder of the combustion air 50 that has flowed out of the combustion air passage 53 (for example, about 70% of the whole) flows further downward and is mixed with the combustion exhaust gas generated by the combustion. Thus, a large amount of combustion exhaust gas is generated.

  The purpose of installing the first cylinder 16 is to delay a part of the combustion air 50 from being supplied to the atomized liquid fuel 24, that is, to the atomized liquid fuel 24 at a position away from the plate 18 downward. It is made to supply, and it can prevent that a flame contacts the plate 18 and a soot adheres to the plate 18 by this. Therefore, the length of the first cylinder 16, that is, the tip position (lower end position) of the first cylinder 16 is the size of the plate 18 (the distance from the spray hole 44 of the two-fluid spray nozzle 38 to the combustion air circulation hole 52. ) To be set as appropriate.

  That is, the first cylinder 16 is not provided, and the combustion air circulation hole 51 is separated from the spray hole 44 just by providing the plate 18 and the combustion air circulation hole 52 on the outer periphery of the plate 18. A part of the combustion air 50 that has passed through the circulation hole 51 is supplied to the atomized liquid fuel 24 at a position away from the plate 18 downward. The position where a part of the combustion air 50 is supplied to the atomized liquid fuel 24 is further away from the plate 18 as the distance from the spray hole 44 to the combustion air circulation hole 52 becomes longer. The diameter of the two-fluid spray burner 11 increases as the plate 18 is enlarged and the distance from the spray hole 44 to the combustion air circulation hole 52 is increased.

  On the other hand, when the distance from the spray hole 44 to the combustion air circulation hole 52 is restricted due to the size restriction of the two-fluid spray burner 11 or the like, the combustion air is simply provided by providing the plate 18 and the combustion air circulation hole 51. In some cases, it may not be possible to sufficiently delay the supply of a part of 50 to the atomized liquid fuel 24. In this case, it is very effective to provide the first cylinder 16 as shown in the drawing. In this case, the first cylinder 16 may be extended downward as the distance from the spray hole 44 to the combustion air circulation hole 52 becomes shorter. However, in order to avoid interference between the first cylinder 16 and the sprayed liquid fuel 24, the tip (lower end) of the first cylinder 16 is positioned outside (upper) of the outer portion 24A of the sprayed liquid fuel 24. There is a need to. That is, the front end (lower end) of the first cylinder 16 can extend only to the outer portion 24 </ b> A of the sprayed liquid fuel 24.

  If the distance from the spray hole 44 to the combustion air circulation hole 52 is shortened, the installation position of the first cylinder 16 also approaches the spray hole 44, so the distance from the plate 18 to the outer portion 24A of the atomized liquid fuel 24 is also increased. Since it becomes shorter, the first cylinder 16 cannot be made too long. Therefore, in consideration of such restrictions, the distance from the spray hole 44 to the combustion air circulation hole 52 and the length of the first cylinder 16 (including the necessity of the first cylinder 16) are appropriately determined. That's fine.

  The second cylinder 17 is located inside the first cylinder 16 and is disposed concentrically with the first cylinder 16. The purpose of installing the second cylinder 17 is to prevent stagnation (convection) of the atomized liquid fuel 24 in the vicinity of the plate 18, so that flames contact the plate 18 and soot adheres to the plate 18. Is to prevent. For that purpose, it is better to extend the second cylinder 17 downward as much as possible. However, in order to avoid interference between the second cylinder 17 and the atomized liquid fuel 24, the tip (lower end) of the second cylinder 17 needs to be positioned outside (upper) the outer portion 24 </ b> A of the atomized liquid fuel 24. There is. That is, the tip (lower end) of the second cylinder 17 can also extend only to the outer portion 24 </ b> A of the atomized liquid fuel 24.

  For example, as shown in FIG. 1, when the distance from the spray hole 44 of the two-fluid spray nozzle 38 to the second cylinder 17 is L1, and the angle with the horizontal line of the outer portion 24A of the sprayed liquid fuel 24 is θ, two The length L2 from the tip (lower end) of the fluid spray nozzle 38 (spray hole 44) to the tip (lower end) of the second cylinder 17 needs to satisfy 0 <L2 ≦ L1 tan θ. The total length of the second cylinder 17 is the length obtained by adding the length from the lower surface of the plate 18 to the tip (lower end) of the two-fluid spray nozzle 38 (spray hole 44). Such a condition applies to the length from the tip (lower end) of the two-fluid spray nozzle 38 (spray hole 44) to the tip (lower end) of the second cylinder 17 and the entire length of the first cylinder 16. is there. The distance from the spray hole 44 of the two-fluid spray nozzle 38 to the second cylinder 16 is, for example, 50 times or more or 60 times or more the hole diameter (for example, about 1 mm) of the spray hole 44.

  As described above, according to the two-fluid spray burner 11 of the first embodiment, the cylindrical side portion 20 and the bottom portion 21 provided at the lower end of the side portion 20 are provided. A liquid configured to store the supplied liquid fuel 24 and to cause the stored liquid fuel 24 to flow out from a liquid fuel outflow hole 22 which is located below the liquid level of the stored liquid fuel 24 and opened in the bottom 21. Since the fuel tank 19 is provided and the liquid fuel 24 flowing out from the liquid fuel outflow hole 22 of the liquid fuel tank 19 is atomized with the atomizing air 46 and burned, the liquid fuel 24 is supplied to the liquid fuel supply pipe 24. Even when the liquid fuel tank 19 is intermittently supplied from the liquid fuel tank 19, the liquid fuel stored in the liquid fuel tank 19 continuously flows out from the liquid fuel outflow hole 22 of the liquid fuel tank 19. That is, even when the supply flow rate of the pump of the liquid fuel supply system decreases and the liquid fuel 24 is intermittently supplied from the liquid fuel supply pipe 25 to the liquid fuel tank 19, the liquid stored in the liquid fuel tank 19 The liquid level 23 of the fuel 24 slightly fluctuates up and down, and the outflow flow rate of the liquid fuel 24 from the liquid fuel outflow hole 22 slightly fluctuates. For this reason, even when the liquid fuel supply flow rate is low, stable supply of the liquid fuel 24 becomes possible, and it becomes easy to establish stable combustion, and there is no possibility of generating unburned exhaust gas or causing misfire.

  Further, according to the two-fluid spray burner 11 of the first embodiment, the liquid fuel 22 flowing out from the liquid fuel outflow hole 22 and flowing into the two-fluid merge space 43 moves down the atomizing air flow path 28. The atomizing air introduced into the two-fluid merging space 43 after flowing through the groove 40 in the atomizing air introducing portion 37 and the two-fluid merging space 43 after being joined. Since the fuel is sprayed from the spray hole 44 together with the air, the liquid fuel 24 is well mixed in the two-fluid merging space 43 with the atomizing air 46 whose flow velocity is increased in the groove 40 (the velocity component in the horizontal direction is increased). After that, the fluid is sprayed from the spray hole 44 of the two-fluid spray nozzle 38. For this reason, compared with the case where the two-fluid merging space 43 and the groove 40 are not provided, the spread angle of the spray of the liquid fuel 24 is increased, and the liquid fuel 24 is reliably atomized. Will improve.

  Further, according to the two-fluid spray burner 11 of the first embodiment, the groove 40 of the atomizing air introduction part 37 is formed so as to be along the circumferential tangential direction of the two-fluid merge space part 43 in a top view. As a result, in the two-fluid merge space 43, the atomizing air 46 is swirled and mixed with the liquid fuel 24, so that the liquid fuel 24 and the atomizing air 46 are more reliably mixed. For this reason, the liquid fuel 24 injected from the spray hole 44 of the two-fluid spray nozzle 38 can be atomized more reliably, and the combustibility of the liquid fuel 24 can be further improved.

  Further, according to the two-fluid spray burner 11 of the first embodiment, the groove 40 of the atomizing air introduction portion 37 is in a rotationally symmetric positional relationship around the central axis of the two-fluid merge space portion 43. Since a plurality of liquid fuels 24 are formed, the distribution amount in the circumferential direction of the liquid fuel 24 sprayed from the spray holes 44 of the two-fluid spray nozzle 38 can be made uniform, and the combustibility of the liquid fuel 24 can be improved.

  Further, according to the two-fluid spray burner 11 of the first embodiment, the bottom portion 21 of the liquid fuel tank 19 is moved to the two-fluid spray nozzle 38 by providing the coil spring 36 that presses the liquid fuel tank 19 downward. Since the configuration is such that the bottom surface 21b of the fuel tank 19 and the top surface 37a of the atomizing air introduction portion 37 are in close contact with each other, the contact surfaces 21b, It is possible to prevent a gap from being formed between 37a. For this reason, it can prevent that the atomization air 46 flows through parts other than the groove | channel 40, and can fully exhibit the effect of the wide spray by the groove | channel 40. FIG.

  Further, according to the two-fluid spray burner 11 of the first embodiment, the two-fluid merging space 43 has an inverted conical shape, and the spray hole 44 is formed at the apex position of the inverted conical space 43. Therefore, the mixing of the liquid fuel 24 and the atomizing air 46 in the two-fluid merge space 43 can be performed more reliably. For this reason, the liquid fuel 24 sprayed from the spray hole 44 can be atomized more reliably, and the combustibility of the liquid fuel 24 can be further improved.

  Further, according to the two-fluid spray burner 11 of the first embodiment, a cylindrical gas fuel flow path formed between the sprayer outer cylinder 27 and the gaseous fuel supply pipe 47 surrounding the sprayer outer cylinder 27. 14, the gaseous fuel 49 flows downward through the gaseous fuel flow path 14, and is injected from the lower end of the gaseous fuel flow path 14 and burned, so that it is injected from the cylindrical gaseous fuel flow path 14. Since the gaseous fuel 49 becomes uniform in the circumferential direction, the combustibility is improved. For example, when the supply amount of the liquid fuel 24 is small, the flame holding effect by the gaseous fuel 49 is exhibited.

  Further, in the two-fluid spray burner 11 of the first embodiment, when the tip portion 25A of the liquid fuel supply pipe 25 is in contact with the inner peripheral surface 20a of the side portion 20 of the liquid fuel tank 19, the liquid fuel supply is performed. Even when the outflow amount of the liquid fuel 24 from the pipe 25 is small, the liquid fuel 24 flows down along the inner peripheral surface 20a, so that the outflow of the liquid fuel 24 from the liquid fuel outflow hole 22 can be further stabilized. . That is, when the liquid fuel 24 falls in a granular form, the liquid level 23 of the liquid fuel 24 stored in the liquid fuel tank 19 fluctuates greatly, and when the liquid level 23 is very low, the liquid fuel temporarily It is conceivable that the outflow hole 22 is exposed and the outflow of the liquid fuel 24 is interrupted. However, if the liquid fuel 24 flows down along the inner peripheral surface 20a of the liquid fuel tank 19, the occurrence of such a problem can be prevented. Can do.

  Furthermore, according to the two-fluid spray burner 11 of the first embodiment, the combustion air 50 that has flowed downward through the combustion air flow path 15 is blocked by the plate 18 to the outer peripheral side of the plate 18. Is guided away from the two-fluid spray nozzle 38 and passes through the combustion air circulation hole 52 and flows into the combustion space 13, so that only a part of the combustion air 50 is in the combustion space 13. It is mixed with the liquid fuel 24 sprayed from the two-fluid spray nozzle 38 and used for combustion of the liquid fuel 24. The remainder of the combustion air 50 flows further downward and is mixed with the combustion exhaust gas generated by the combustion. Will be. For this reason, the combustion air 50 and the liquid fuel 24 can be appropriately mixed by supplying the combustion air once (first stage), and a large amount of combustion exhaust gas can be generated without overcooling the flame. Can be generated. That is, it is possible to realize a burner such as a two-fluid spray burner that can generate a large amount of combustion exhaust gas with a simple configuration and does not cause generation of unburned gas or misfire.

  Further, since the combustion air 50 is caused to flow into the combustion space portion 13 at a position away from the two-fluid spray nozzle 38 by the plate 18, the position where a part of the combustion air 50 is supplied to the fuel is moved downward from the plate 18. You can keep away. Accordingly, the position of the flame is also moved downward from the plate 18, and soot can be prevented from adhering to the lower surface of the plate 18. If the amount of soot adhering to the lower surface of the plate 18 increases, problems such as clogging of the two-fluid spray nozzle 38 due to soot and abnormal heating of the two-fluid sprayer 12 caused by soot absorbing the radiant heat of the flame may occur. However, by preventing the wrinkles from adhering to the lower surface of the plate 18 as described above, it is possible to prevent such a problem from occurring.

  Further, according to the two-fluid spray burner 11 of the first embodiment, the first cylinder 16 for delaying the supply of combustion air extending downward from the lower surface of the plate 18 is provided, and the first cylinder 16 and the outside of the burner are provided. A cylindrical combustion air flow path 53 that communicates with the combustion air circulation hole 52 is formed between the cylinder 48 and the combustion air 50 that has passed through the combustion air circulation hole 52 passes through the combustion air flow path 53 downward. Since the combustion air passage 53 flows into the combustion space portion 13 from the lower end of the combustion air flow path 53, a part of the combustion air 50 is supplied to the liquid fuel 24 sprayed from the two-fluid spray nozzle 38. Can be delayed. That is, the position where a part of the combustion air 50 is supplied to the liquid fuel 24 can be moved downward from the plate 18. Accordingly, the position of the flame is also moved downward from the plate 18, and soot can be prevented from adhering to the lower surface of the plate 18.

  Note that the effect of moving the position where a part of the combustion air 50 is supplied to the liquid fuel 24 downward from the plate 18 can be obtained only by providing the plate 18 as described above. As described above, if the first cylinder 16 for delaying the supply of combustion air is provided, the position where a part of the combustion air 50 is supplied to the liquid fuel 24 can be moved away from the plate 18 more reliably.

  Further, when the size of the two-fluid spray burner 11 is restricted, the plate 18 cannot be made too large, and the distance from the two-fluid spray nozzle 38 to the combustion air circulation hole 52 cannot be sufficient. In some cases, the amount of the combustion air 50 supplied to the liquid fuel 24 becomes too large, and the flame is excessively cooled. On the other hand, if the first cylinder 16 for delaying the supply of combustion air is provided as in the first embodiment, the position where a part of the combustion air 50 is supplied to the liquid fuel 24 is lowered from the plate 18. In addition, the amount of the combustion air 50 supplied to the liquid fuel 24 at this time can be reduced to an appropriate amount. Therefore, from this point of view, it is effective to provide the first cylinder 16 as in the first embodiment. By providing the first cylinder 16, the plate 18 can be made smaller and the two-fluid spray burner 11 can be downsized. You can also.

  Further, according to the two-fluid spray burner 11 of the first embodiment, the second cylinder 17 for preventing stagnation extending downward from the lower surface of the plate 18 is provided inside the first cylinder 16 for delaying the supply of combustion air. Accordingly, the stagnation (convection) of the liquid fuel 24 near the lower surface of the plate 18 can be prevented by the second cylinder 17 for preventing stagnation. For this reason, it is possible to prevent the liquid fuel 24 stagnating in the vicinity of the lower surface of the plate 18 from being ignited and soot from adhering to the lower surface of the plate 18.

  Further, according to the two-fluid spray burner 11 of the first embodiment, the flame (sprayed liquid fuel 24) and the combustion air 50 are well generated in the combustion space 13 by surrounding the flame with the burner outer cylinder 48. Since it can mix, combustibility improves.

<Embodiment 2>
FIG. 6A is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray burner according to Embodiment 2 of the present invention, and FIG. It is a top view (E direction arrow view of Drawing 6 (a)) which extracts and shows a fluid spray nozzle.

  As shown in FIG. 6, in the two-fluid spray nozzle 38 of the two-fluid sprayer 12 in the second embodiment, grooves (slits) 61 are formed at four locations in the circumferential direction of the atomizing air introduction portion 37. . These grooves 61 are of a collision type, are along the radial direction of the two-fluid merge space 43 having a circular shape when viewed from above, and the central axis of the two-fluid merge space 43 (in the illustrated example, the spray hole 44). It is formed so as to have a rotationally symmetrical positional relationship (equally spaced in the circumferential direction) around the central axis).

  In the two-fluid sprayer 21, the atomization air 46 that has flowed downward through the atomization air flow path 28 flows through the groove 61 of the atomization air introduction portion 37 in the two-fluid spray nozzle 38, thereby causing a flow velocity. Is introduced into the two-fluid merging space 43, and the two-fluid merging space 43 is joined (mixed) so as to collide with the liquid fuel 24 flowing out from the liquid fuel outflow hole 22 of the liquid fuel tank 19. To do. As a result, the liquid fuel 24 and the atomizing air 46 are well mixed, and the liquid fuel 24 is atomized by the atomizing air 46 together with the atomizing air 46 from the spray hole 44 of the two-fluid spray nozzle 38. And injected into the combustion space 13.

  In addition, the structure of the other part in the two-fluid sprayer 12 of FIG. 6 is the same as that of the two-fluid sprayer 12 of FIG. Further, the configuration of the portion other than the two-fluid sprayer in the two-fluid spray burner of the second embodiment is also the same as that of the two-fluid spray burner 11 in FIGS.

  According to the two-fluid spray burner of the second embodiment, the following functions and effects can be obtained. In addition, the same functions and effects as those of the first embodiment can be obtained.

  That is, according to the two-fluid spray burner of the second embodiment, the groove 61 of the atomizing gas introduction part 37 is formed so as to be along the radial direction of the two-fluid merge space part 43 in a top view. In the two-fluid merge space 43, the atomizing air 46 is mixed with the liquid fuel 24 so as to collide with the liquid fuel 24, so that the liquid fuel 24 and the atomizing air 46 are more reliably mixed. For this reason, the liquid fuel 24 injected from the spray hole 44 of the two-fluid spray nozzle 38 can be atomized more reliably, and the combustibility of the liquid fuel 24 can be further improved.

  Moreover, since the plurality of grooves 61 of the atomizing gas introduction part 37 are formed so as to have a rotationally symmetrical positional relationship around the central axis of the two-fluid merge space part 43, the spray hole 44 of the two-fluid spray nozzle 38. The distribution amount in the circumferential direction of the liquid fuel 24 sprayed from can be made uniform, and the combustibility of the liquid fuel 24 can be improved.

<Embodiment 3>
FIG. 7A is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray burner according to Embodiment 3 of the present invention, and FIG. It is a top view (F direction arrow line view of Drawing 7 (a)) which extracts and shows a fluid spray nozzle.

  As shown in FIG. 7, in the two-fluid sprayer 12 of the third embodiment, the inner surface (upper surface) 21a of the bottom 21 of the liquid fuel tank 19 is a tapered (reverse conical) tapered surface, and the center ( A fine liquid fuel outflow hole 22 is formed at the apex of the inverted conical tapered surface. The outer surface (lower surface) 21b of the bottom portion 21 of the liquid fuel tank 19 has a tapered surface in which the outer portion 21b-1 is tapered (inverted truncated cone shape), and the inner portion 21b-2 is a circular horizontal surface. ing.

  On the other hand, the atomizing air introduction portion 37 of the two-fluid spray nozzle 38 is formed in an annular shape, and the inner peripheral surface 37b is tapered (inverted truncated cone shape). The liquid fuel tank 19 is in contact with the outer portion 21b-1 (taper surface portion) of the lower surface 21b of the bottom portion 21 so as to fit into the inner peripheral surface 37b (taper surface portion) of the atomizing air introduction portion 37. Therefore, it is installed on the atomizing air introduction part 37. In this case, when the liquid fuel tank 19 is pressed downward by the coil spring 36 (see FIG. 4), the outer portion 21b-1 (taper surface portion) of the lower surface 21b of the bottom portion 21 of the liquid fuel tank 19 is introduced into the atomizing air. The inner surface 37b (tapered surface portion) of the portion 37 is pressed and brought into close contact with each other to prevent a gap from being generated between the contact surfaces 21b-1 and 37b.

  The nozzle main body 39 of the two-fluid spray nozzle 38 has an inverted conical space (recessed portion) 42 formed at the center thereof, and a fine spray at the center (vertical position of the inverted conical space 42). A hole 44 is formed. The space part 41 of the atomizing air introduction part 37 and the space part 42 of the nozzle main body part 39 are continuous, and these space parts 41, 42 constitute a two-fluid merge space part 43. That is, the two-fluid merging space portion 43 has a circular shape in plan view (top view), and has a tapered structure in which the diameter gradually decreases toward the spray hole 44. The atomizing air introducing portion 37 has grooves (slits) 40 formed at two locations in the circumferential direction. These grooves 40 are of a swivel type similar to the grooves 40 of FIG. 5, are along the tangential direction of the circumference of the two-fluid merge space 43 in a top view, and are center axes of the two-fluid merge space 43 with respect to each other. A rotationally symmetrical positional relationship (equally spaced in the circumferential direction) is provided around the periphery. In addition, the groove | channel formed in the atomization air introduction part 37 is not restricted to a turning type | mold, The collision type thing similar to FIG. 6 may be used.

  The structure of the other part in the two-fluid sprayer 12 of FIG. 7 is the same as that of the two-fluid sprayer 12 of FIG. Further, the configuration of the portion other than the two-fluid sprayer in the two-fluid spray burner of the third embodiment is the same as that of the two-fluid spray burner 11 of FIGS.

  According to the two-fluid spray burner of the third embodiment, the following functions and effects can be obtained. In addition, the same functions and effects as those of the first and second embodiments can be obtained.

  That is, according to the two-fluid spray burner of the third embodiment, the liquid fuel tank 19 has a tapered surface portion (the outer portion 21b-1 of the lower surface 21b of the bottom portion 21) of the liquid fuel tank 19 and an atomizing gas introduction portion. 37. Since it is installed on the atomizing gas introduction part 37 in a state of being in contact with the taper surface part (inner peripheral surface 37b) of 37, the central axes of the liquid fuel tank 19 and the two-fluid spray nozzle 38 are arranged. It is easy to match. Accordingly, there is no deviation of the liquid fuel tank 19, the width of the atomizing air passage 28 is made uniform in the circumferential direction, and the flow of the atomizing air 46 in the atomizing air passage 28 is made uniform in the circumferential direction. Therefore, the symmetry of the spray of the liquid fuel 24 from the spray hole 44 of the two-fluid spray nozzle 38 (that is, the symmetry of the flame) can be ensured.

  In the two-fluid spray burner of the third embodiment, the liquid fuel tank 19 is pressed downward by the coil spring 36 (see FIG. 4), so that the bottom 21 of the liquid fuel tank 19 is moved to the two-fluid spray nozzle 38. By pressing against the atomizing air introduction part 37, the taper surface part (outer part 21 b-1) of the bottom part 21 of the fuel tank 19 and the taper surface part (inner peripheral surface 37 b) of the atomization air introduction part 37 are brought into close contact with each other. It is possible to prevent a gap from being formed between the contact surfaces 21b-1 and 37b. For this reason, it can prevent that the atomization air 46 flows through parts other than the groove | channel 40, and can fully exhibit the effect of the wide spray by the groove | channel 40. FIG.

<Embodiment 4>
FIG. 8A is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray burner according to Embodiment 4 of the present invention (longitudinal view taken along line GG in FIG. 8B). 8 (b) is a bottom view (a view in the direction of the arrow H in FIG. 8 (a)) showing the liquid fuel tank provided in the two-fluid sprayer, and FIG. 8 (c) is FIG. FIG. 8B is a cross-sectional view taken along line JJ in FIG. 8A.

  As shown in FIG. 8, in the two-fluid sprayer 12 of the fourth embodiment, the inner surface (upper surface) 21a of the bottom portion 21 of the liquid fuel tank 19 is a tapered (reverse conical) tapered surface, and the center ( A fine liquid fuel outflow hole 22 is formed at the apex of the inverted conical tapered surface. Further, the outer surface (lower surface) 21b of the bottom portion 21 of the liquid fuel tank 19 has a tapered surface in which the outer portion 21b-1 is tapered (in the shape of an inverted truncated cone), and the inner portion 21b-2 is a circular horizontal surface. ing.

  On the other hand, the two-fluid spray nozzle 38 does not have an atomizing air introducing portion (see FIG. 7), and is formed integrally with the sprayer outer cylinder 27 at the lower end of the sprayer outer cylinder 27 (separately welded). Etc.) The two-fluid spray nozzle 38 has a tapered surface whose inner surface (upper surface) 38a is tapered (inverted conical shape). For this reason, the liquid fuel tank 19 is in a state in which the outer portion 21b-1 (tapered surface portion) of the lower surface 21b of the bottom portion 21 is in contact with the inner surface 38a (tapered surface portion) of the two-fluid spray nozzle 38. It is installed on the fluid spray nozzle 38. In this case, when the liquid fuel tank 19 is pressed downward by the coil spring 36 (see FIG. 4), the outer portion 21b-1 (tapered surface portion) of the lower surface 21b of the bottom portion 21 of the liquid fuel tank 19 becomes the two-fluid spray nozzle 38. The inner surface 38a (tapered surface portion) is pressed and brought into close contact with each other to prevent a gap from being formed between the contact surfaces 21b-1 and 38b.

  An inverted conical space formed at the center of the two-fluid spray nozzle 38 by the tapered inner surface 38 a is a two-fluid merge space 43. The fine spray hole 44 is formed at the center of the two-fluid merge space 43 (the apex position of the inverted conical space 43) and communicates with the two-fluid merge space 43. That is, the two-fluid merging space portion 43 has a circular shape in plan view (top view), and has a tapered structure in which the diameter gradually decreases toward the spray hole 44.

  Grooves (slits) 71 are formed at two locations in the circumferential direction on the lower surface 21 b side of the bottom 21 of the liquid fuel tank 19. These grooves 71 are of a swivel type, and have a rotationally symmetrical positional relationship along the tangential direction of the circumference of the two-fluid merge space portion 43 in the top view and around the central axis of the two-fluid merge space portion 43 ( (Equally spaced in the circumferential direction).

  Accordingly, the atomizing air 46 that has flowed downward through the atomizing air flow path 28 circulates in the groove 71 in the bottom 21 of the liquid fuel tank 19 so as to increase the flow velocity, so that the two-fluid merging space 43. In the two-fluid merging space portion 43, a swirling flow is formed and merged (mixed) with the liquid fuel 24 flowing out from the liquid fuel outflow hole 22 of the liquid fuel tank 19. As a result, the liquid fuel 24 and the atomizing air 46 are well mixed, and the liquid fuel 24 is atomized by the atomizing air 46 together with the atomizing air 46 from the spray hole 44 of the two-fluid spray nozzle 38. And injected into the combustion space 13.

  In addition, the structure of the other part in the two-fluid sprayer 12 of FIG. 8 is the same as that of the two-fluid sprayer 12 of FIG. Further, the configuration of the portion other than the two-fluid sprayer in the two-fluid spray burner of the fourth embodiment is also the same as that of the two-fluid spray burner 11 of FIGS.

  According to the two-fluid spray burner of the third embodiment, the following functions and effects can be obtained. In addition, the same functions and effects as those of the first embodiment can be obtained.

  That is, according to the two-fluid spray burner of the fourth embodiment, the liquid fuel 24 flowing out from the liquid fuel outflow hole 44 and flowing into the two-fluid merging space 43 moves down the atomizing air flow path 28 downward. And the atomizing air 46 that has flowed through the groove 71 at the bottom 21 of the liquid fuel tank 19 and led to the two-fluid merge space 43 and the two-fluid merge space 43, With the configuration in which the liquid fuel 24 is sprayed from the spray hole 44 together with the air 46, the liquid fuel 24 increases the flow velocity in the groove 71 (the velocity component in the horizontal direction has increased) and the two-fluid merge space 43. And mixed well and sprayed from the spray hole 44. For this reason, compared with the case where the two-fluid merge space 43 and the groove 71 are not provided, the spread angle of the spray of the liquid fuel 24 is increased, and the liquid fuel 24 is reliably atomized. Will improve.

  Further, the liquid fuel tank 19 abuts so that the tapered surface portion of the liquid fuel tank 19 (the outer portion 21b-1 of the lower surface 21b of the bottom portion 21) fits into the tapered surface portion (inner surface 38a) of the two-fluid spray nozzle 38. In this state, since it is installed on the two-fluid spray nozzle 38, it is easy to align the central axes of the liquid fuel tank 19 and the two-fluid spray nozzle 38. Accordingly, there is no deviation of the liquid fuel tank 19, the width of the atomizing air passage 28 is made uniform in the circumferential direction, and the flow of the atomizing air 46 in the atomizing air passage 28 is made uniform in the circumferential direction. Therefore, the symmetry of the spray of the liquid fuel 24 from the spray hole 44 of the two-fluid spray nozzle 38 (that is, the symmetry of the flame) can be ensured.

  Further, the groove 71 of the bottom portion 21 of the liquid fuel tank 19 is formed so as to be along the circumferential tangential direction of the two-fluid merge space portion 43 in a top view, so that the atomizing air 46 is formed in the two-fluid merge space portion 43. Becomes a swirl flow and is mixed with the liquid fuel 24, so that the liquid fuel 24 and the atomizing air 46 are more reliably mixed. For this reason, the liquid fuel 24 injected from the spray hole 44 of the two-fluid spray nozzle 38 can be atomized more reliably, and the combustibility of the liquid fuel 24 can be further improved.

  In addition, since the plurality of grooves 71 in the bottom 21 of the liquid fuel tank 19 are formed so as to have a rotationally symmetrical positional relationship around the central axis of the two-fluid merge space 43, the spray hole 44 of the two-fluid spray nozzle 38. The distribution amount in the circumferential direction of the liquid fuel 24 sprayed from can be made uniform, and the combustibility of the liquid fuel 24 can be improved.

  In the two-fluid spray burner of the fourth embodiment, the bottom portion 21 of the liquid fuel tank 19 is moved to the two-fluid spray nozzle 38 by pressing the liquid fuel tank 19 downward by the coil spring 36 (see FIG. 4). By pressing, the taper surface portion (outer portion 21b-1) of the bottom portion 21 of the fuel tank 19 and the taper surface portion (inner surface 38a) of the two-fluid spray nozzle 38 are brought into close contact with each other, so that the contact surfaces 21b-1 and 38a are in contact with each other. A gap can be prevented from being formed. For this reason, it can prevent that the atomization air 46 flows through parts other than the groove | channel 71, and can fully exhibit the effect of the wide spray by the groove | channel 71. FIG.

<Embodiment 5>
FIG. 9A is a longitudinal sectional view showing a configuration of a lower part of a two-fluid sprayer in a two-fluid spray burner according to Embodiment 5 of the present invention (a sectional view taken along line KK in FIG. 9B). 9 (b) is a bottom view (a view in the direction of the arrow L in FIG. 9 (a)) showing the liquid fuel tank provided in the two-fluid sprayer, and FIG. 9 (c) is FIG. 9 (a). It is a cross-sectional view of MM line arrow.

  As shown in FIG. 9, in the two-fluid sprayer 12 according to the fifth embodiment, the inner surface (upper surface) 21a of the bottom 21 of the liquid fuel tank 19 is a tapered (reverse conical) tapered surface, and the center ( A fine liquid fuel outflow hole 22 is formed at the apex of the inverted conical tapered surface. Further, the outer surface (lower surface) 21b of the bottom portion 21 of the liquid fuel tank 19 has a tapered surface in which the outer portion 21b-1 is tapered (in the shape of an inverted truncated cone), and the inner portion 21b-2 is a circular horizontal surface. ing.

  On the other hand, the two-fluid spray nozzle 38 does not have an atomizing air introducing portion (see FIG. 7), and is formed integrally with the sprayer outer cylinder 27 at the lower end of the sprayer outer cylinder 27 (separate one). It may be fixed by welding). The two-fluid spray nozzle 38 has a tapered surface whose inner surface (upper surface) 38a is tapered (inverted conical shape). For this reason, the liquid fuel tank 19 has a two-fluid spray in a state where the outer portion 21b-1 (tapered surface) of the lower surface 21b of the bottom 21 is in contact with the inner surface 38a (tapered surface) of the two-fluid spray nozzle 38. It is installed on the nozzle 38. In this case, when the liquid fuel tank 19 is pressed downward by the coil spring 36 (see FIG. 4), the outer portion 21b-1 (tapered surface portion) of the lower surface 21b of the bottom portion 21 of the liquid fuel tank 19 becomes the two-fluid spray nozzle 38. The inner surface 38a (tapered surface portion) is pressed and brought into close contact with each other to prevent a gap from being formed between the contact surfaces 21b-1 and 38b.

  In addition, an inverted conical space formed in the center of the two-fluid spray nozzle 38 by the tapered inner surface 38 a is a two-fluid merge space 43. The fine spray hole 44 is formed at the center of the two-fluid merge space 43 (the apex position of the inverted conical space 43) and communicates with the two-fluid merge space 43. That is, the two-fluid merging space portion 43 has a circular shape in plan view (top view), and has a tapered structure in which the diameter gradually decreases toward the spray hole 44.

  On the lower surface 21 b side of the bottom portion 21 of the liquid fuel tank 19, grooves (slits) 81 are formed at four locations in the circumferential direction. These grooves 81 are of a collision type, and have a rotationally symmetrical positional relationship (e.g., circumferential direction) along the radial direction of the two-fluid merge space 43 in the top view and around the central axis of the two-fluid merge space 43. (Interval).

  Therefore, the atomizing air 46 that has flowed downward through the atomizing air flow path 28 flows through the groove 81 in the bottom portion 21 of the liquid fuel tank 19 so as to increase the flow velocity, so that the two-fluid merge space 43 In the two-fluid merging space 43, the liquid fuel 24 flowing out from the liquid fuel outflow hole 22 of the liquid fuel tank 19 is joined (mixed) so as to collide. As a result, the liquid fuel 24 and the atomizing air 46 are well mixed, and the liquid fuel 24 is atomized by the atomizing air 46 together with the atomizing air 46 from the spray hole 44 of the two-fluid spray nozzle 38. And injected into the combustion space 13.

  In addition, the structure of the other part in the two-fluid sprayer 12 of FIG. 9 is the same as that of the two-fluid sprayer 12 of FIG. Further, the configuration of the portion other than the two-fluid sprayer in the two-fluid spray burner of the fifth embodiment is the same as that of the two-fluid spray burner 11 of FIGS.

  According to the two-fluid spray burner of the fifth embodiment, the same effects as those of the fourth embodiment described above can be obtained. In addition, the same effects as the first embodiment can be obtained. can get.

  That is, according to the two-fluid spray burner of the fifth embodiment, the liquid fuel 24 flowing out from the liquid fuel outflow hole 44 and flowing into the two-fluid merging space 43 moves down the atomizing air flow path 28 downward. And the atomizing air 46 that has flowed through the groove 81 at the bottom 21 of the liquid fuel tank 19 and led to the two-fluid merge space 43 and the two-fluid merge space 43, With the configuration in which the liquid fuel 24 is sprayed from the spray hole 44 together with the air 46, the liquid fuel 24 increases the flow velocity in the groove 81 (the velocity component in the horizontal direction has increased) and the two-fluid merge space 43. And mixed well and sprayed from the spray hole 44. For this reason, compared with the case where the two-fluid merging space 43 and the groove 81 are not provided, the spread angle of the spray of the liquid fuel 24 is increased and the liquid fuel 24 is reliably atomized. Will improve.

  Further, the liquid fuel tank 19 abuts so that the tapered surface portion of the liquid fuel tank 19 (the outer portion 21b-1 of the lower surface 21b of the bottom portion 21) fits into the tapered surface portion (inner surface 38a) of the two-fluid spray nozzle 38. In this state, since it is installed on the two-fluid spray nozzle 38, it is easy to align the central axes of the liquid fuel tank 19 and the two-fluid spray nozzle 38. Accordingly, there is no deviation of the liquid fuel tank 19, the width of the atomizing air passage 28 is made uniform in the circumferential direction, and the flow of the atomizing air 46 in the atomizing air passage 28 is made uniform in the circumferential direction. Therefore, the symmetry of the spray of the liquid fuel 24 from the spray hole 44 of the two-fluid spray nozzle 38 (that is, the symmetry of the flame) can be ensured.

  Further, the groove 81 in the bottom 21 of the liquid fuel tank 19 is formed along the tangential direction of the circumference of the two-fluid merge space 43 in a top view, so that the atomizing air 46 is formed in the two-fluid merge space 43. Becomes a swirl flow and is mixed with the liquid fuel 24, so that the liquid fuel 24 and the atomizing air 46 are more reliably mixed. For this reason, the liquid fuel 24 injected from the spray hole 44 of the two-fluid spray nozzle 38 can be atomized more reliably, and the combustibility of the liquid fuel 24 can be further improved.

  Further, since a plurality of grooves 81 at the bottom 21 of the liquid fuel tank 19 are formed so as to have a rotationally symmetrical positional relationship around the central axis of the two-fluid merge space 43, the spray holes 44 of the two-fluid spray nozzle 38 are formed. The distribution amount in the circumferential direction of the liquid fuel 24 sprayed from can be made uniform, and the combustibility of the liquid fuel 24 can be improved.

  In the two-fluid spray burner of the fourth embodiment, the bottom portion 21 of the liquid fuel tank 19 is moved to the two-fluid spray nozzle 38 by pressing the liquid fuel tank 19 downward by the coil spring 36 (see FIG. 4). By pressing, the taper surface portion (outer portion 21b-1) of the bottom portion 21 of the fuel tank 19 and the taper surface portion (inner surface 38a) of the two-fluid spray nozzle 38 are brought into close contact with each other, so that the contact surfaces 21b-1 and 38a are in contact with each other. A gap can be prevented from being formed. For this reason, it can prevent that the atomization air 46 flows through parts other than the groove | channel 81, and can fully exhibit the effect of the wide spray by the groove | channel 81. FIG.

<Embodiment 6>
FIG. 10A is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray burner according to Embodiment 6 of the present invention, and FIG. It is a cross-sectional view of L line arrow.

  As shown in FIG. 10, in the two-fluid sprayer 12 of the sixth embodiment, the inner surface (upper surface) 21 a of the bottom 21 of the liquid fuel tank 19 is a tapered surface (inverted conical shape), and the center ( A fine liquid fuel outflow hole 22 is formed at the apex of the inverted conical tapered surface. Further, the outer surface (lower surface) 21b of the bottom 21 of the liquid fuel tank 19 is also tapered (in the shape of an inverted truncated cone). On the other hand, the two-fluid spray nozzle 38 does not have an atomizing air introducing portion (see FIG. 7), and is formed integrally with the sprayer outer cylinder 27 at the lower end of the sprayer outer cylinder 27 (separately welded). Etc.) The two-fluid spray nozzle 38 has a tapered surface whose inner surface (upper surface) 38a is tapered (inverted conical shape).

  A plurality of (four in the illustrated example) support portions 91 project from the lower end portion of the outer peripheral surface 20 b of the side portion 20 of the liquid fuel tank 19. These support portions 91 are provided at equal intervals in the circumferential direction of the side portion 20, and the outer portion 91 a-1 of the lower surface 91 a becomes a tapered surface inclined inward along the inner surface 38 a of the two-fluid spray nozzle 38. ing. Accordingly, the liquid fuel tank 19 is supported in a state in which the outer portion 91a-1 of the lower surface 91a of the support portion 91 is in contact with the inner surface 38a of the two-fluid spray nozzle 38. As a result, the liquid fuel tank 19 is supported. 19, a tapered (inverted truncated cone) gap is secured between the outer surface 21 a of the bottom portion 21 and the inner surface 38 a of the two-fluid spray nozzle 38, and this gap serves as an atomizing air flow path 92. That is, the outer first atomizing air flow path 28 and the inner two-fluid merging space 43 are communicated with each other via the second atomizing air flow path 92.

  The two-fluid merge space 43 is an inverted conical space formed at the center of the two-fluid spray nozzle 38 by the tapered inner surface 38a. The fine spray hole 44 is formed at the center of the two-fluid merge space 43 (the apex position of the inverted conical space 43) and communicates with the two-fluid merge space 43. That is, the two-fluid merging space 43 is positioned below the liquid fuel outflow hole 22 and has a tapered structure in which the plan view (top view) is circular and the diameter gradually decreases toward the spray hole 44. It has become.

  The atomizing air 46 that has flowed downward through the atomizing air flow path 28 passes through the atomizing air flow section 93 between the support portions 91 and flows through the atomizing air flow path 92. It is introduced into the two-fluid merge space 43 and merges (mixes) so as to collide with the liquid fuel 24 flowing out from the liquid fuel outflow hole 22 of the liquid fuel tank 19 in the two-fluid merge space 43. As a result, the liquid fuel 24 is sprayed from the spray hole 44 of the two-fluid spray nozzle 38 into the combustion space 13 together with the atomizing air 46 in a state of being atomized by the atomizing air 46.

  In addition, the structure of the other part in the two-fluid sprayer 12 of FIG. 10 is the same as that of the two-fluid sprayer 12 of FIG. Further, the configuration of the portion other than the two-fluid sprayer in the two-fluid spray burner of the sixth embodiment is the same as that of the two-fluid spray burner 11 of FIGS.

  According to the two-fluid spray burner of the sixth embodiment, the following functions and effects can be obtained. In addition, the same functions and effects as those of the first embodiment can be obtained.

  That is, according to the two-fluid spray burner of the sixth embodiment, the liquid fuel 24 flowing out from the liquid fuel outflow hole 22 and flowing into the two-fluid merging space 43 is supplied to the first atomizing gas channel 28. Is passed through the atomizing air circulation portion 93 between the support portions 91 and then flows through the second atomizing air flow path 92 and led to the two-fluid merge space portion 43. The liquid that flows out from the liquid fuel outflow hole 22 of the liquid fuel tank 19 by being configured to be sprayed from the spray hole 44 together with the atomizing air 46 after being merged with the working air 46 and the two-fluid merge space 43. The fuel 24 is injected from the spray hole 44 of the two-fluid spray nozzle 38 after being mixed in the atomizing air 46 and the two-fluid merge space 43. For this reason, compared with the case where the two-fluid merging space 43 is not provided, the spread angle of the spray of the liquid fuel 24 is increased and the liquid fuel 24 is reliably atomized, so that the combustibility of the liquid fuel is improved.

<Embodiment 7>
11 is a longitudinal sectional view showing a configuration of a two-fluid spray burner according to Embodiment 7 of the present invention, and FIG. 12 is a transverse sectional view taken along line MM in FIG.

  As shown in FIGS. 11 and 12, in the two-fluid spray burner of the seventh embodiment, the plate 18 is a perforated plate. That is, a plurality of combustion air circulation holes 101 are formed in the annular plate 18. Each of these combustion air circulation holes 101 is provided inside the combustion air circulation hole 52 (first cylinder 16). Accordingly, the combustion air 50 that has flowed downward through the combustion air flow path 15 mainly passes through the combustion air circulation holes 52 on the outer peripheral side of the plate 19 and flows outside the first cylinder 16. After flowing through the passage 53, it flows into the combustion space portion 13, but part of it flows into the combustion space portion 13 through the combustion air flow hole 101 inside the first cylinder 16.

  In addition, the structure of the other part in the two-fluid spray burner 11 of FIG.11 and FIG.12 is the same as that of the two-fluid spray burner 11 of FIGS.

  According to the two-fluid spray burner of the seventh embodiment, the following functions and effects can be obtained. In addition, the same functions and effects as those of the first embodiment can be obtained.

  That is, according to the two-fluid spray burner of the seventh embodiment, a plurality of combustion air circulation holes 101 are formed in the plate 18 on the inner side of the combustion air circulation holes 52. Since a part of the air 50 also passes through the combustion air circulation holes 101, it is possible to suppress the stagnation flow of the combustion air from being generated near the lower surface of the plate 18 due to the flow of the combustion air 50, It is possible to suppress wrinkles from adhering to the lower surface of the plate 18. Further, since the low-temperature combustion air flows in the vicinity of the two-fluid spray nozzle 38 through the other combustion air circulation holes 101, the two-fluid spray nozzle 38 that is easily overheated by the radiant heat of the flame is cooled by the combustion air. The effect that it can be also obtained.

<Embodiment 8>
FIG. 13 is a system diagram showing an outline of a fuel cell power generation system according to Embodiment 8 of the present invention. FIG. 13 shows an example in which the two-fluid spray burner according to any of the first to seventh embodiments is used as a heat source for a reformer in a fuel cell power generation system.

  As shown in FIG. 13, a combustion furnace 112 is provided in the upper part of the reformer 111, and the two-fluid spray burner 11 of any one of the first to seventh embodiments is inserted from above the combustion furnace 112. Has been. A liquid fuel supply system, an atomizing air supply system, and a combustion air supply system (not shown) are connected to the two-fluid spray burner 11. The details of the two-fluid spray burner 11 are as described above.

  A raw material supply system (not shown) is connected to the reformer 111, and reforming fuel such as methane gas and kerosene and water are supplied as raw materials for reforming from the raw material supply system. In the reformer 111, the reformed fuel (hydrogen-rich gas) is reformed by steam reforming the reforming fuel using the heat of a large amount of combustion exhaust gas generated by combustion in the two-fluid spray burner 11. Is generated.

  The reformed gas generated by the reformer 11 is supplied to the anode side of the fuel cell 113 as a power generation fuel. In the fuel cell 113, power is generated by electrochemically reacting the reformed gas (hydrogen) supplied to the anode side and air (oxygen) supplied to the cathode side. The remaining reformed gas that has not been used for power generation in the fuel cell 113 is returned to the two-fluid spray burner 11 where it is used as gaseous fuel for burner combustion.

  According to the fuel cell power generation system of the eighth embodiment, since the two-fluid spray burner 11 of any of the first to seventh embodiments is used as a heat source of the reformer 111, the two-fluid spray burner 11 is By exhibiting such excellent effects as described above, it is possible to improve the performance of the reformer 111 and reduce costs.

  Although only one liquid fuel outflow hole 22 is provided in the liquid fuel tank 19 in the above description, the present invention is not limited to this, and a plurality of liquid fuel tanks 22 may be provided.

  In the above description, the liquid fuel outflow hole is provided at the bottom of the liquid fuel tank. However, the present invention is not limited to this, and the liquid fuel outflow hole may be provided at the side of the liquid fuel tank. That is, the liquid fuel tank has a cylindrical side portion and a bottom portion provided at the lower end of the side portion, and stores the liquid fuel supplied from the liquid fuel supply pipe, and is more than the liquid level of the stored liquid fuel. What is necessary is just the structure which flows out the said stored liquid fuel from the 1 or several liquid fuel outflow hole located in the downward direction and opened in the side part or the bottom part.

  In the above, the liquid fuel tank is provided in the outer cylinder of the sprayer. However, the present invention is not necessarily limited thereto. For example, a liquid fuel tank is provided outside the outer cylinder of the sprayer, and the liquid fuel tank is provided from the liquid fuel outflow hole. It is good also as a structure which supplies the liquid fuel which flowed out to the confluence | merging space part with the gas for atomization via piping etc.

  In the above configuration, the pressure of the atomizing air flowing into the atomizing air flow path by opening the upper end side of the liquid fuel tank also acts on the liquid fuel level stored in the liquid fuel tank. However, the present invention is not necessarily limited to this. For example, the upper end side of the liquid fuel tank may be opened to the atmosphere. That is, due to the pressure balance between the inside and outside of the liquid fuel tank (the two-fluid merge space), the liquid fuel flowing out from the liquid fuel supply pipe is temporarily stored in the liquid fuel tank, and the liquid column head of the liquid fuel is As a result, the stored liquid fuel may be configured to continuously flow out from the liquid fuel outflow hole.

  In the above description, two grooves are provided for the swivel type and four grooves are provided for the collision type. However, the number of grooves is not limited to this and may be an appropriate number. However, in order to ensure the uniformity of the distribution in the circumferential direction of the spray amount of the liquid fuel, it is desirable that the number of grooves is two or more for the swivel type and three or more for the collision type.

  Further, as described above, the configuration (invention) in which the plate (shielding plate), the first cylinder for delaying the supply of combustion air, the second cylinder for preventing stagnation, and the like are provided. The present invention can be applied not only to a two-fluid spray burner having a two-fluid sprayer for injecting fuel as a fuel injector, but also to a burner having a fuel injector for injecting only liquid fuel or a fuel injector for injecting gaseous fuel. .

  Further, in the above, the combustion air circulation holes are provided on the outer peripheral side of the plate (shielding plate) by forming protrusions on the outer periphery of the plate (shielding plate). However, the present invention is not limited to this. For example, by providing a hole in the peripheral edge of the plate (shield) itself so that the combustion air circulation hole is provided on the outer peripheral side of the plate. Also good.

  In the above description, the plate (shielding plate) is a horizontal plate. However, the present invention is not limited to this, and the plate (shielding plate) may be inclined obliquely downward from the inside toward the outside. For example, the plate 18 may be formed in a truncated cone shape as virtually illustrated by a dashed line in FIG. In the case of this inclined plate, not only the combustion air is kept away from the fuel injection nozzle (two-fluid spray nozzle 38) but also the same function as the first cylinder for delaying the supply of the combustion air is exhibited. Become.

  The present invention relates to a two-fluid spray burner that burns liquid fuel in an atomized gas atomized state, for example, reforming a fuel cell power generation system that may be used even when the supply flow rate of liquid fuel is small It is useful when applied to a dexterous two-fluid spray burner.

It is a longitudinal cross-sectional view which shows the structure of the two-fluid spray burner which concerns on Example 1 of Embodiment of this invention. It is a cross-sectional view of the AA line arrow of FIG. It is a cross-sectional view of the BB line arrow of FIG. (A) is an expanded longitudinal cross-sectional view which extracts and shows the two-fluid sprayer with which the two-fluid spray burner of FIG. 1 was equipped, (b) is a cross-sectional view of the CC arrow of (a). (A) is a longitudinal sectional view showing the lower part of the two-fluid sprayer in an enlarged manner, (b) is a top view showing the two-fluid spray nozzle provided in the two-fluid sprayer (D direction of (a)) (Arrow view). (A) is a longitudinal cross-sectional view which shows the structure of the lower part of the two-fluid sprayer in the two-fluid spray burner which concerns on Embodiment 2 of this invention, (b) is the two-fluid spray nozzle with which the said two-fluid sprayer was equipped. It is the top view extracted and shown (E direction arrow view of (a)). (A) is a longitudinal cross-sectional view which shows the structure of the lower part of the two-fluid sprayer in the two-fluid spray burner which concerns on Embodiment 3 of this invention, (b) is the two-fluid spray nozzle with which the said two-fluid sprayer was equipped. It is a top view (F direction arrow view of (a)) extracted and shown. (A) is a longitudinal cross-sectional view (longitudinal cross-sectional view taken along line GG in (b)) showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray burner according to Embodiment 4 of the present invention; (B) is a bottom view extracted from the liquid fuel tank provided in the two-fluid sprayer (a view in the direction of arrow H in (a)), (c) is a view in the direction of arrow I in (b), (d) FIG. 3 is a transverse cross-sectional view taken along line JJ in (a). (A) is a longitudinal cross-sectional view (sectional view taken along line KK in (b)) showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray burner according to Embodiment 5 of the present invention, (b) ) Is a bottom view extracted from the liquid fuel tank provided in the two-fluid sprayer (a view in the direction of the arrow L in (a)), and (c) is a cross-sectional view in the direction of the arrows MM in (a). is there. (A) is a longitudinal cross-sectional view which shows the structure of the lower part of the two-fluid sprayer in the two-fluid spray burner which concerns on Example 6 of this invention, (b) is the crossing of the LL line | wire arrow of (a). FIG. It is a longitudinal cross-sectional view which shows the structure of the two-fluid spray burner which concerns on Example 7 of Embodiment of this invention. It is a cross-sectional view of the MM line arrow of FIG. It is a systematic diagram which shows the outline | summary of the fuel cell power generation system which concerns on Example 8 of Embodiment of this invention. (A) is a figure which shows a mode that liquid fuel flows out from the front-end | tip part of a liquid fuel supply pipe | tube in the conventional two-fluid spray burner, (b) is a supply flow volume of liquid fuel large in the conventional two-fluid spray burner. It is a figure which shows a mode that it fluctuates.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Two-fluid spray burner 12 Two-fluid sprayer 13 Combustion space part 14 Gas fuel flow path 15 Combustion air flow path 16 1st cylinder 17 2nd cylinder 18 Plate 19 Liquid fuel tank 20 Side part 20a Inner peripheral surface 20b Outer peripheral surface 21 Bottom 21a Inner surface (upper surface)
21b Outer surface (lower surface)
21b-1 outer part 21b-2 inner part 22 liquid fuel outflow hole 23 liquid level 24 liquid fuel 24A outer part 25 liquid fuel supply pipe 25A tip part (lower end part)
26 Washer 27 Atomizer outer cylinder 27A Lower end portion 27B Upper end portion 28 Atomization air flow path 29 Air inflow hole 30 Atomization air supply pipe 30A Tip portion 31 Cap 32, 33 Screw portion 31A Lower portion 31B Step portion 34 O-ring 35 Washer 36 Coil spring 37 Atomizing gas introduction part 37a Upper surface 37b Inner peripheral surface 38 Two-fluid spray nozzle 38a Inner surface (upper surface)
39 Nozzle body part 40 Groove 41 Space part 42 Space part (concave part)
43 Two-fluid merge space 44 Spray hole 45 Clearance 46 Atomization air 47 Gas fuel supply pipe 48 Burner outer cylinder 48a Inner peripheral surface 49 Gas fuel 50 Combustion air 51 Projection 52 Combustion air flow hole 53 Combustion air flow path 54 Spark plug 61 Groove 81 Groove 91 Support portion 91a Lower surface 91a-1 Outer portion 92 Atomization air flow path 93 Atomization air flow portion 101 Combustion air flow hole 111 Reformer 112 Combustion furnace 113 Fuel cell

Claims (12)

In a two-fluid spray burner in which liquid fuel is atomized with an atomizing gas and burned,
It has a cylindrical side portion and a bottom portion provided at the lower end of the side portion, stores liquid fuel supplied from a liquid fuel supply pipe, and is positioned below the liquid level of the stored liquid fuel. A liquid fuel tank configured to discharge the stored liquid fuel from one or a plurality of liquid fuel outflow holes opened in a side portion or the bottom portion;
A two-fluid spray burner characterized in that the liquid fuel that has flowed out of the liquid fuel outflow hole of the liquid fuel tank is atomized with the atomizing gas and burned. The two-fluid spray burner according to claim 1,
The liquid fuel outflow hole is opened at the bottom of the liquid fuel tank,
A cylindrical atomizing gas flow path formed between a side of the liquid fuel tank and an outer cylinder surrounding the side;
The nozzle main body portion is provided at the lower end portion of the outer cylinder, has a lower nozzle body portion and an upper atomizing gas introduction portion, and the two-fluid merge space portion located below the liquid fuel outflow hole. And at the center of the atomizing gas introduction part, one or more spray holes communicating with the two-fluid merge space part are formed in the nozzle body part, and the atomizing gas flow path and the A two-fluid spray nozzle having a configuration in which one or a plurality of grooves communicating with a two-fluid merge space portion is formed in the atomizing gas introduction portion;
With
The liquid fuel tank is installed on the atomizing gas introduction part,
After the liquid fuel flowing out from the liquid fuel outflow hole and flowing into the two-fluid merging space portion flows downward in the atomizing gas flow path, the liquid fuel flows through the groove in the atomizing gas introduction portion, and A two-fluid characterized in that the atomizing gas guided to the two-fluid merging space and the atomizing gas are sprayed from the spray hole together with the atomizing gas after merging in the two-fluid merging space. Spray burner. The two-fluid spray burner according to claim 2,
A tapered surface portion is formed on the lower surface of the bottom portion of the liquid fuel tank,
And the tapered surface part is formed also in the upper surface of the gas introduction part for atomization,
The liquid fuel tank is installed on the atomizing gas introducing portion in a state where the tapered surface portion of the liquid fuel tank is in contact with the tapered surface portion of the atomizing gas introducing portion. Features two-fluid spray burner. The two-fluid spray burner according to claim 1,
The liquid fuel outflow hole is opened at the bottom of the liquid fuel tank,
A cylindrical atomizing gas flow path formed between a side of the liquid fuel tank and an outer cylinder surrounding the side;
A two-fluid merging space portion provided at a lower end portion of the outer cylinder and positioned below the liquid fuel outflow hole is formed in a central portion, and one or a plurality of spray holes communicating with the two-fluid merging space portion are provided. A two-fluid spray nozzle with a formed configuration;
With
A tapered surface portion is formed on the lower surface of the bottom portion of the liquid fuel tank,
In addition, a tapered surface portion is formed on the upper surface of the two-fluid spray nozzle,
The liquid fuel tank is installed on the two-fluid spray nozzle in a state where the tapered surface portion of the liquid fuel tank is in contact with the tapered surface portion of the two-fluid spray nozzle.
At the bottom of the liquid fuel tank, one or a plurality of grooves communicating the atomizing gas flow path and the two-fluid merge space portion are formed,
After the liquid fuel flowing out from the liquid fuel outflow hole and flowing into the two-fluid merging space flows downward through the atomizing gas flow path, the liquid fuel flows through the groove at the bottom of the liquid fuel tank, and the second A two-fluid spray characterized by being configured to be sprayed from the spray hole together with the atomizing gas after the atomizing gas guided to the fluid joining space and the two-fluid joining space are merged Burner. The two-fluid spray burner according to any one of claims 2 to 4,
The two-fluid merging space is circular when viewed from above.
The two-fluid spray burner characterized in that the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is formed along the tangential direction of the circumference of the two-fluid merging space part in a top view. . The two-fluid spray burner according to any one of claims 2 to 4,
The two-fluid merging space is circular when viewed from above.
The two-fluid spray burner characterized in that the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is formed along the radial direction of the two-fluid merge space part in a top view. The two-fluid spray burner according to claim 5 or 6,
A plurality of grooves in the atomizing gas introduction part or in a bottom part of the liquid fuel tank are formed so as to have a rotationally symmetrical positional relationship around the central axis of the two-fluid merge space part. Two-fluid spray burner. The two-fluid spray burner according to claims 2-7,
By including a pressing member that presses the liquid fuel tank downward,
The bottom of the liquid fuel tank was configured to be pressed against the atomizing air introducing portion of the two-fluid spray nozzle,
Alternatively, the bottom of the liquid fuel tank is configured to be pressed against the two-fluid spray nozzle,
A two-fluid spray burner characterized by The two-fluid spray burner according to claim 1,
The liquid fuel outflow hole is opened at the bottom of the liquid fuel tank,
A cylindrical first atomizing gas flow path formed between a side portion of the liquid fuel tank and an outer cylinder surrounding the side portion;
A two-fluid merging space portion provided at a lower end portion of the outer cylinder and positioned below the liquid fuel outflow hole is formed in a central portion, and one or a plurality of spray holes communicating with the two-fluid merging space portion are provided. A two-fluid spray nozzle with a formed configuration;
With
A tapered surface portion is formed on the upper surface of the two-fluid spray nozzle,
A tapered surface portion is also formed on the lower surface of the bottom portion of the liquid fuel tank,
A plurality of support portions project from the side portion of the liquid fuel tank, and a tapered surface portion is formed on the lower surface of these support portions,
The liquid fuel tank is installed on the two-fluid spray nozzle in a state in which the tapered surface portion of the support portion is in contact with the tapered surface portion of the two-fluid spray nozzle.
A gap secured between the tapered surface portion of the liquid fuel tank and the tapered surface portion of the two-fluid spray nozzle by the support portion as a second atomizing gas flow path,
After the liquid fuel that has flowed out of the liquid fuel outflow hole and has flowed into the two-fluid merging space portion flows downward through the first atomizing gas flow path, the atomizing gas flow between the support portions The atomizing gas that has passed through the part and flows through the second atomizing gas flow path and led to the two-fluid merging space part, and the two-fluid merging space part, A two-fluid spray burner characterized by being sprayed from the spray hole together with gas. In the two-fluid spray burner according to any one of claims 2 to 9,
The two-fluid spray burner is characterized in that the two-fluid merging space portion has an inverted conical shape, and the spray hole is formed at the apex position of the inverted conical space portion. In the two-fluid spray burner according to any one of claims 2 to 10,
A cylindrical gaseous fuel flow path formed between the outer cylinder and a gaseous fuel supply pipe surrounding the outer cylinder;
The two-fluid spray burner is configured such that the gaseous fuel flows downward in the gaseous fuel flow path, and is injected and burned from a lower end of the gaseous fuel flow path. In the two-fluid spray burner according to any one of claims 1 to 11,
A two-fluid spray burner characterized in that a tip portion of the liquid fuel supply pipe is in contact with an inner peripheral surface of a side portion of the liquid fuel tank.

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