WO2008018431A1

WO2008018431A1 - Burner

Info

Publication number: WO2008018431A1
Application number: PCT/JP2007/065402
Authority: WO
Inventors: Keiichi Nakagawa; Naohiko Matsuda; Katsuki Yagi; Shigeru Nojima; Akira Goto
Original assignee: Mitsubishi Heavy Industries, Ltd.; Nippon Oil Corporation
Priority date: 2006-08-11
Filing date: 2007-08-07
Publication date: 2008-02-14
Also published as: JP2008064445A; JP4739275B2; CA2656194A1; TW200821505A; US20090291401A1; KR20090034964A

Abstract

A burner, such as a twin-fluid atomizing burner, which can generate a large amount of combustion exhaust gas with a simple structure, does not cause unburnt gas nor misfire, and can make flame shorter and a combustion exhaust gas flow rate distribution more uniform. The burner comprises a twin-fluid atomizer (12), a tubular combustion air flow path (15) formed between the atomizer and a burner outer tube (48) surrounding the atomizer, a plate (a blocking plate) (18) partitioning between this combustion air flow path and a combustion space (13), and a combustion air flowing hole (52) provided on the outer peripheral side of this plate, wherein combustion air (50) flowing downward through the combustion air flow path is intercepted by the plate and guided to the outer peripheral side of the plate to be thereby moved away from a twin-fluid atomizing nozzle (38), and then passes through the combustion air flowing hole to be introduced into the combustion space. In addition, a combustion air supply/storage/delay first cylinder (16) and a stagnation preventing second cylinder (17) are provided at the bottom of the plate. A throttle plate having a flowing hole opened in the center is provided in the combustion space.

Description

Specification

Nokuna

Technical field

[0001] The present invention relates to a burner and is useful when applied to, for example, a two-fluid spray burner that burns liquid fuel in a state of being atomized with an atomizing gas.

Background art

[0002] A two-fluid spray panner 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 cell power generation system. In this case, the reformer uses the heat of the flue gas generated by the combustion of the two-fluid spray panner to reform the reforming fuel such as methane gas or kerosene by steam reforming, thereby improving the reformed gas (hydrogen-rich gas). And the reformed gas is supplied to the fuel cell as a power generation fuel.

[0003] And, in the conventional two-fluid spray panner, when a large amount of combustion exhaust gas is generated for the purpose of heating a large-capacity reformer or the like, a method of supplying air in two stages has been adopted. . In this case, in the first stage, liquid fuel such as kerosene sprayed from the nozzle of the two-fluid spray panner is mixed with the supply air from the air supply source and burned, and in the second stage, the combustion in the first stage is performed. A large amount of combustion exhaust gas is generated by supplying air from a different air supply source to the generated combustion exhaust gas at a location different from the first stage air supply location.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2002-224592

Disclosure of the invention

Problems to be solved by the invention

[0005] However, in the conventional two-fluid spraying pan, in addition to combustion by air supply at the first stage, air is supplied at a location different from the first stage at the second stage. As a result, the entire device becomes larger. Note that if a large amount of air is supplied at a time to generate a large amount of combustion exhaust gas, instead of supplying air separately in the first and second stages, the flame is cooled by the large amount of air. Too much heat leads to a decrease in the evaporation rate of the liquid fuel and a decrease in the reaction rate of the fuel and oxygen, resulting in a longer flame, easier generation of unburned gas and unburned liquid fuel (mist), and misfire. There is also a risk of incurring. [0006] Therefore, in view of the above circumstances, the present invention can generate a large amount of combustion exhaust gas with a simple configuration, and there is no risk of generating unburned gas or misfire, and further shortening the flame. It is an object to provide a burner such as a two-fluid spraying burner that can make the flow distribution of combustion exhaust gas uniform.

Means for solving the problem

[0007] The first aspect of the invention to solve the above problem is that a fuel (gaseous fuel, liquid fuel, or liquid fuel and atomized fuel) from a fuel injection nozzle of a fuel injector to a combustion space below the fuel injection nozzle. To a burner that injects and burns two fluids! /,

A cylindrical combustion air flow path formed between the fuel injector and a PANA outer cylinder surrounding the fuel injector;

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, thereby being moved away from the fuel injection nozzle, and the combustion air flow It is characterized by being configured to flow through the hole and flow into the combustion space.

[0008] The burner of the second invention is the burner of the first invention,

A combustion air supply delay cylinder extending downward from the lower surface of the shielding plate is provided, and the other combustion air flow in the cylinder that communicates with the combustion air circulation hole between the cylinder and the outer Pana cylinder. Form a road,

The combustion air that has passed through the combustion air circulation hole flows downward into the other combustion air flow path, and then flows into the combustion space from the lower end of the other combustion air flow path. It is characterized by having a configuration.

[0009] The burner of the third invention is a burner of the second invention,

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.

[0010] Further, the burner of the fourth invention is any one of the first to third inventions, A plurality of other combustion air circulation holes are formed in the shielding plate inside the combustion air circulation holes! /.

[0011] Further, the burner of the fifth invention is the burner of any of the first to fourth inventions,

The fuel injector is for injecting liquid fuel from the fuel injection nozzle, and a cylindrical gaseous fuel flow path is formed between the fuel injector and a gaseous fuel supply pipe surrounding the fuel injector. And

The gaseous fuel flows through the gaseous fuel flow path downward, and is injected from the lower end of the gaseous fuel flow path into the combustion space and burned.

[0012] Further, the burner of the sixth invention is any one of the first to fifth inventions,

A diaphragm plate having a through hole in the center is provided in the combustion space,

Combustion air that has flowed downward through the combustion space is guided to the center of the combustion space by the throttle plate and passes through the flow hole of the throttle plate.

[0013] Further, the burner of the seventh invention is the burner of the sixth invention,

A swirl spring is provided on the upper side of the diaphragm plate,

The flow of the combustion air passing through the flow hole of the throttle plate is configured to be a swirl flow by the swirl spring.

[0014] Further, the eighth aspect of the invention is the same as the sixth or seventh aspect of the invention.

A perforated plate having a through hole in the center is provided in the combustion space above the throttle plate, and a part of the combustion air that has flowed downward through the combustion space is transferred by the perforated plate. It is characterized in that it is guided to the central part of the combustion space part and passes through the flow hole of the perforated plate.

[0015] When any of the first to eighth inventions is a two-fluid spray panner, the configuration of the two-fluid spray panner may be as follows.

[0016] That is, the first configuration is a two-fluid spraying panner in which any of the first to eighth inventions causes the liquid fuel to be atomized and burned with the atomizing gas. 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 positioned below the liquid level of the stored liquid fuel. The A liquid fuel tank configured to discharge the stored liquid fuel from one or a plurality of liquid fuel outflow holes opened in the 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.

[0017] Further, the two-fluid spraying panner of the second configuration is the two-fluid spraying panner of the first configuration.

The liquid fuel outflow hole is formed at the bottom of the liquid fuel tank, and is a cylindrical atomizing gas flow path formed between a side portion of the liquid fuel tank and an outer cylinder surrounding the side portion. When,

The nozzle body includes a two-fluid merging space portion provided at a lower end portion of the outer cylinder, having a lower nozzle main body portion and an upper atomizing gas introduction portion, and located below the liquid fuel outflow hole. Formed in the central part of the gas atomizing part and the atomizing gas introduction part, one or a plurality of spray holes communicating with the two-fluid merging space part are formed in the nozzle body part, and the atomizing gas flow path And a two-fluid spray nozzle having a configuration in which one or a plurality of grooves communicating with the two-fluid merging space portion are 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 through the atomizing gas flow path, it flows through the groove at the atomizing gas introduction portion. 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. .

[0018] Further, the two-fluid spray burner having the third configuration is the two-fluid spray burner having the second configuration,

A tapered surface portion is formed on the lower surface of the bottom portion of the liquid fuel tank, and a tapered surface portion is also formed on the upper surface of the atomizing gas introduction portion, and the liquid fuel tank includes the liquid fuel tank. In the state where the tapered surface portion of the tank is in contact with the tapered surface portion of the atomizing gas introducing portion, the upper surface of the atomizing gas introducing portion is It is characterized by being installed in

[0019] Further, the four-fluid spray burner of the fourth configuration is the two-fluid spray burner of the first configuration.

One or a plurality of spray holes that are provided at the lower end of the outer cylinder and that form a two-fluid merge space portion located below the liquid fuel outflow hole in the center and communicate with the two-fluid merge space portion A two-fluid spray nozzle configured to form

With

A tapered surface portion is formed on the lower surface of the bottom portion of the liquid fuel tank, and a tapered surface portion is also formed on the upper surface of the two-fluid spray nozzle, and the liquid fuel tank is the same as the liquid fuel tank. The tapered surface portion is installed on the two-fluid spray nozzle in a state where the tapered surface portion 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 that communicate the atomizing gas flow path and the two-fluid merging space are formed,

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 and then flows through the groove at the bottom of the liquid fuel tank. The 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.

[0020] Also, the two-fluid spray burner of the fifth configuration is the two-fluid spray burner of any of the second to fourth configurations,

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. [0021] Further, the two-fluid spraying panner of the sixth configuration is the two-fluid spraying panner of any of the second to fourth configurations.

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.

[0022] Further, the two-fluid spraying burner of the seventh configuration is the same as the groove of the atomizing gas introduction section or the liquid fuel tank in the two-fluid spraying burner of the fifth or sixth configuration. A plurality of grooves at the bottom of the two-fluid merging space are formed so as to have a rotationally symmetrical positional relationship around the central axis of the two-fluid merging space.

[0023] Further, the two-fluid spraying panner of the eighth configuration is the two-fluid spraying panner of the second to seventh inventions, comprising a pressing member that presses the liquid fuel tank downward. The bottom part of the tank was pressed against the atomizing air introducing part of the two-fluid spray nozzle,

Alternatively, the bottom of the liquid fuel tank may be pressed against the two-fluid spray nozzle so as to be in close contact with each other,

It is characterized by.

[0024] Further, the nine-component two-fluid spray burner is the first-structure two-fluid spray burner,

The liquid fuel outflow hole is opened at the bottom of the liquid fuel tank, and is a cylindrical first atomization formed between a side portion of the liquid fuel tank and an outer cylinder surrounding the side portion. A gas flow path;

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 is also formed on the bottom surface,

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 taper surface portion of the two-fluid spray nozzle.

A gap secured by the support portion between the tapered surface portion of the liquid fuel tank and the tapered surface portion of the two-fluid spray nozzle is used as a second atomizing gas flow path.

The liquid fuel flowing out from the liquid fuel outflow hole and flowing into the two-fluid merging space portion flows downward through the first atomizing gas flow path, and then the atomizing gas flow between the support portions Passing through the second atomizing gas flow path and flowing into the two-fluid merging space portion and the two-fluid merging space portion and then joining the atomizing gas. It is characterized in that the gas is sprayed from the spray hole together with the gas.

[0025] Further, the two-fluid spray burner of the tenth configuration is the two-fluid spray burner of any of the second to ninth configurations,

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.

[0026] Further, the two-fluid spray burner of the eleventh configuration is the two-fluid spray burner of any of the first to tenth configurations,

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 invention's effect

According to the first aspect of the invention, the combustion aerodynamic force flowing downward in the combustion air flow path is blocked by the shielding plate and guided to the outer peripheral side of the shielding plate. Since it is configured to flow away from the fuel injection nozzle and pass through the combustion air circulation hole and flow into the combustion space portion, only a part of the combustion air is injected from the fuel injection nozzle in the combustion space portion. The fuel is mixed with fuel and used for combustion of the fuel, and the remainder of the combustion air flows further downward and is mixed with the combustion exhaust gas generated by the combustion. For this reason, by supplying combustion air once (1 stage), it is possible to achieve a proper mixing of combustion air and fuel, and a large amount of combustion exhaust gas that does not overcool the flame is generated. The power to make it S Therefore, it is possible to realize a pan such as a two-fluid spraying panner that can generate a large amount of combustion exhaust gas with a simple configuration and that does not cause unburned gas generation or misfire.

[0028] Further, since the combustion air is caused to flow into the combustion space by the shielding plate at a position away from the fuel injection nozzle, the position where a part of the combustion air is supplied to the fuel is moved downward from the shielding plate. That power S. Therefore, the position of the flame also moves away from the shielding plate, and it is possible to prevent the soot 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 caused by soot absorbing the radiant heat of the flame may occur. However, by preventing wrinkles from adhering to the lower surface of the shield as described above, it is possible to prevent the occurrence of force and troubles.

[0029] According to the second aspect of the invention, the combustion air supply delay cylinder extending downward from the lower surface of the shielding plate is provided, and the combustion air flow is provided between the cylinder and the outer casing cylinder. The other combustion air flow path in the form of a cylinder communicating with the hole is formed, and after the combustion air that has passed through the combustion air flow hole flows downward through the other combustion air flow path, the other combustion air flow path is formed. 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. Therefore, the position of the flame also moves away from the shielding plate, and the force S can be prevented from adhering to the lower surface of the shielding plate. Note that the effect of moving the position where a part of the combustion air is supplied to the fuel away from the shielding plate is the force that can be obtained only by providing the shielding plate as described above. By providing an air supply delay cylinder, the position where a part of the combustion air is supplied to the fuel can be moved away from the shield more reliably.

[0030] In addition, in the first invention! /, Because of the size limitation of the spanner, the shield plate cannot be made too large, and the distance from the fuel injection nozzle to the combustion air circulation hole is sufficient. If this is not possible, the amount of combustion air supplied to the fuel may be too large and the flame may be overcooled. In contrast, if a cylinder for delaying the supply of combustion air is provided as in the second aspect of the invention, the position where a part of the combustion air is supplied to the fuel can be determined. At this time, it is possible to reduce the amount of a part of the combustion air supplied to the fuel to an appropriate amount as long as it can be kept away from the shielding plate. Therefore, from this point of view, it is effective to provide the cylinder as in the second invention. By providing the cylinder, the shielding plate can be made small and the size of the panner can be reduced.

[0031] According to the third aspect of the invention, by providing one or a plurality of stagnation prevention cylinders extending downward from the lower surface of the shielding plate inside the combustion air supply delay cylinder, It is possible to prevent stagnation (convection) of fuel near the lower surface of the shielding plate with the stagnation prevention cylinder. For this reason, it is possible to prevent the fuel stagnating near the lower surface of the shielding plate from igniting and soot from adhering to the lower surface of the shielding plate.

[0032] According to the panner of the fourth aspect of the present invention, 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. Since these other combustion air circulation holes also pass, it is possible to suppress the occurrence of a stagnation flow of combustion air near the bottom surface of the shielding plate due to the flow of the combustion air. It is possible to suppress the adhesion of soot. In addition, since the low-temperature combustion air flows in the vicinity of the fuel injection nozzle through the other combustion air circulation holes, the fuel injection nozzle can be cooled by being easily overheated by the radiant heat of the flame. If you can, you will get a good effect.

[0033] According to the fifth aspect of the invention, the fuel injector injects liquid fuel from the fuel injection nozzle, a gaseous fuel supply pipe surrounding the fuel injector, the fuel injector, A cylindrical gaseous fuel channel is formed between the gas fuel channel, the gaseous fuel flows downward in the gaseous fuel channel, and is injected from the lower end of the gaseous fuel channel into the combustion space and burned. As a result, the gaseous fuel injected from the cylindrical gaseous fuel flow path becomes uniform in the circumferential direction, so that the combustibility is improved. For example, the amount of liquid fuel supplied is small! Demonstrate the flame holding effect of fuel.

[0034] According to the panner of the sixth aspect of the present invention, a throttle plate having a through hole in the center is provided in the combustion space, and the combustion air that has flowed downward through the combustion space is supplied to the throttle plate. Therefore, mixing with the combustion air and unburned gas is promoted because it is characterized in that it is guided to the center of the combustion space and passed through the flow hole of the throttle plate. as a result, Since combustion of unburned gas is promoted, the fuel can be burned completely and the flame can be shortened. In addition, since fluid such as combustion air is once squeezed by the flow hole of the squeezing plate, the fluid flow distribution is made uniform in the circumferential direction. For this reason, the furnace and the like can be uniformly heated in the circumferential direction by the combustion exhaust gas.

[0035] According to the seventh aspect of the invention, the swirl spring is provided above the throttle plate, and the flow of the combustion air passing through the flow hole of the throttle plate is swirled by the swirl spring. Therefore, the combustion air that has passed through the flow hole of the throttle plate spreads in the horizontal direction by swirling. As a result, the pressure in the center of the flow of combustion air decreases below the flow hole, and thus a circulation flow of combustion air that flows into the center from the outside is generated. Accordingly, the mixing of the combustion air and the unburned gas is further promoted, and the combustion of the unburned gas is further promoted, so that the fuel is more easily burned and the flame is further shortened.

[0036] According to the panner of the eighth invention, a perforated plate having a flow hole in the center is provided in the combustion space above the throttle plate, and the combustion that has flowed downward through the combustion space Since a part of the air for use is guided to the central part of the combustion space by the perforated plate and passes through the through holes of the perforated plate, the combustion air and the unburned gas Since the mixing is further promoted and the combustion of the unburned gas is further promoted, the fuel is more easily combusted and the flame is further shortened.

[0037] Also, according to the two-fluid spraying panner of the first configuration, it has a cylindrical side portion and a bottom portion provided at the lower end of this side portion, and stores the liquid fuel supplied from the liquid fuel supply pipe. In addition, a liquid body configured to cause the stored liquid fuel to flow out from one or a plurality of liquid fuel outflow holes which are located below the liquid level of the stored liquid fuel and opened in the side portion or the bottom portion. A fuel tank is provided, and the liquid fuel flowing out from the liquid fuel outflow hole of the liquid fuel tank is atomized with the atomizing gas and burned, so that the liquid fuel is transferred from the liquid fuel supply pipe to the liquid fuel tank. Even when intermittently supplied, 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 liquid fuel is intermittently supplied from the liquid fuel supply pipe to the liquid fuel tank due to a decrease in the supply flow rate of the pump of the liquid fuel supply system, The liquid level of the liquid fuel stored in the tank slightly fluctuates up and down, and the outflow rate of the liquid fuel from the outflow hole of the liquid fuel slightly fluctuates. . For this reason, even when the liquid fuel supply flow rate is low, stable supply of liquid fuel becomes possible, and it becomes easy to establish stable combustion, and there is no possibility of causing unburned exhaust gas and misfire.

[0038] According to the two-fluid spray panner of the second configuration, the liquid fuel flowing out from the liquid fuel outflow hole and flowing into the two-fluid merging space flows downward in the atomizing gas flow path. After the atomizing gas introduced into the two-fluid merging space portion through the groove at the atomizing gas introducing portion and the two-fluid merging space portion, the gas is introduced together with the atomizing gas. The liquid fuel is sprayed from the spray hole, so the liquid fuel is well mixed in the two-fluid merging space with the atomizing gas whose flow velocity is increased in the groove (the velocity component in the horizontal direction has increased), and the two-fluid spray nozzle It will be injected from the spray hole. For this reason, compared with the case where the two-fluid merging space and the groove are not provided, the spread angle of the liquid fuel spray is increased and the liquid fuel is surely atomized, so that the combustibility of the liquid fuel is improved.

[0039] According to the two-fluid spray panner of the third configuration, the liquid fuel tank is 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 introduction portion. Since it is installed on the atomizing gas introduction section, it is easy to align the central axes of the liquid fuel tank and the two-fluid spray nozzle. Therefore, the width of the atomizing gas flow path where the liquid fuel tank is offset is made uniform in the circumferential direction, and the flow of the atomizing gas in the atomizing gas flow path 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.

[0040] According to the two-fluid spray panner of the fourth configuration, the liquid fuel flowing out from the liquid fuel outflow hole and flowing into the two-fluid merging space flows downward in the atomizing gas flow path. After the atomizing gas that has flowed through the groove at the bottom of the liquid fuel tank and led to the two-fluid merging space, and merged in the two-fluid merging space, the atomizing gas is combined with the atomizing gas. By adopting a configuration in which the fuel is sprayed from the hole, the liquid fuel is well mixed in the two-fluid confluence space with the atomizing gas whose flow velocity has been increased in the groove (the velocity component in the horizontal direction has 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 surely atomized, so that the combustibility of the liquid fuel is improved.

[0041] 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. Therefore, it is easy to align the central axis of the liquid fuel tank and the two-fluid spray nozzle. Therefore, it is possible to make the width of the atomizing gas flow path that the liquid fuel tank is offset uniform in the circumferential direction, and make the flow of the atomizing gas in the atomizing gas flow path uniform in the circumferential direction. Therefore, it is possible to secure the symmetry of the spray of liquid fuel from the spray hole of the two-fluid spray nozzle (ie, the symmetry of the flame).

[0042] According to the two-fluid spray panner of the fifth configuration, the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank has a bottom surface and the groove of the two-fluid merge space part. By forming along the circumferential tangential direction, the atomizing gas is swirled in the two-fluid merge space and mixed with the liquid fuel. Ensure that they are 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.

[0043] According to the two-fluid spray panner of the sixth configuration, the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is along the radial direction of the two-fluid merge space part in a top view. In this way, in the two-fluid merge space, the atomizing gas collides with the liquid fuel and is mixed 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.

[0044] According to the two-fluid spray panner of the seventh configuration, the groove of the atomizing gas introduction part or the groove of the bottom part of the liquid fuel tank is rotationally symmetric about the central axis of the two-fluid merge space part. As a result, the liquid fuel sprayed from the spray holes of the two-fluid spray nozzle is uniformly distributed in the circumferential direction to improve the combustibility of the liquid fuel. That's the power S.

[0045] According to the two-fluid spraying panner of the eighth configuration, the liquid fuel tank is pressed downward. By providing a pressing member, the bottom portion of the liquid fuel tank is pressed against the atomizing air introducing portion of the two-fluid spray nozzle, or the bottom portion of the liquid fuel tank is Since it is configured to be pressed against and in close contact with the fluid spray nozzle, the bottom surface of the bottom of the fuel tank and the top surface of the atomizing gas introduction section are in close contact, and the tapered surface of the bottom of the fuel tank and the atomizing surface It is possible to prevent a gap from being formed between these contact surfaces by closely contacting the tapered surface portion of the gas introduction portion or by closely contacting the tapered surface portion of the liquid fuel tank and the tapered surface portion of the two-fluid spray nozzle. . For this reason, the atomizing gas is prevented from flowing through the portion other than the groove, and the force S that sufficiently exerts the effect of wide-area spraying by the groove is used.

[0046] According to the two-fluid spray panner of the ninth configuration, the liquid fuel that has flowed out of the liquid fuel outflow hole and flowed into the two-fluid merging space portion moves down the first atomizing gas flow path. And the atomizing gas that has passed through the atomizing gas flow part between the support parts and flowed through the second atomizing gas flow path and led to the two-fluid merging space part. After the merging in the two-fluid merging space portion, the liquid fuel is mixed with the atomizing gas in the two-fluid merging space portion by being configured to be sprayed from the spray hole together with the atomizing gas, It will be sprayed from the spray hole of the two-fluid spray nozzle. 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 surely atomized, so that the combustibility of the liquid fuel is improved.

[0047] According to the two-fluid spray panner of the tenth configuration, 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 mixing of the liquid fuel and the atomizing gas in the two-fluid merging space can be performed more reliably. For this reason, the liquid fuel sprayed from the spray hole can be atomized more reliably and the combustibility of the liquid fuel can be further improved.

[0048] According to the two-fluid spraying panner of the eleventh configuration, 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! Even when the amount of liquid fuel flowing out from the pipe is small, the liquid fuel flows down along the inner peripheral surface, so that the outflow of liquid fuel from the liquid fuel outflow hole can be further stabilized. In other words, if the liquid fuel drops in a granular form, the liquid level of the liquid fuel stored in the liquid fuel tank When the liquid level fluctuates greatly and the liquid level is very low, the liquid fuel outflow hole may be temporarily exposed and the liquid fuel outflow may be interrupted. The liquid fuel travels along the inner surface of the liquid fuel tank. If it flows down, generation | occurrence | production of a force and a trouble can be prevented. Brief Description of Drawings

FIG. 1 is a longitudinal sectional view showing a configuration of a two-fluid spray panner according to Embodiment 1 of the present invention.

2 is a cross-sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view taken along line BB in FIG.

[Fig. 4] (a) is an enlarged longitudinal sectional view showing a two-fluid sprayer provided in the two-fluid spraying panner of FIG. 1, and (b) is a transverse sectional view taken along the line CC in (a). is there.

5] (a) is an enlarged longitudinal sectional view showing the lower part of the two-fluid sprayer, and (b) is a top view showing the two-fluid spray nozzle extracted from the two-fluid sprayer ((a) In the D direction arrow view)

6] (a) is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray panner according to Embodiment 2 of the present invention, and (b) is a diagram of the two-fluid sprayer provided in the two-fluid sprayer. FIG. 4 is a top view (a view in the arrow direction of (a)) showing a fluid spray nozzle extracted.

7] (a) is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray panner according to Embodiment 3 of the present invention, and (b) is the two-part sprayer provided in the two-fluid sprayer. It is a top view (F direction arrow view of (a)) which extracts and shows a fluid spray nozzle.

Fig. 8] (a) is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spraying pan according to Embodiment 4 of the present invention (longitudinal view taken along line G-G in (b)) (B) is a bottom view of the liquid fuel tank provided in the two-fluid sprayer. (C) is a view from the direction of arrow in (a), and (c) is a view from the direction of arrow I in (b). Figure (d) is a cross-sectional view taken along line JJ in (a).

9] (a) is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray panner according to Embodiment 5 of the present invention (cross-sectional view taken along line KK in (b)), (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 arrow Μ-Μ in FIG. FIG.

FIG. 10 (a) is a two-fluid jet in a two-fluid spray pan according to Embodiment 6 of the present invention. FIG. 9B is a longitudinal sectional view showing the configuration of the lower part of the atomizer, and FIG. 11B is a transverse sectional view taken along line N—N in FIG. 11A. 11] Two-fluid spray according to Embodiment 7 of the present invention It is a longitudinal cross-sectional view which shows the structure of a panner.

FIG. 12 is a cross-sectional view taken along line OO in FIG.

[FIG. 13] (a) is a diagram showing a state in which liquid fuel intermittently flows out from the tip of a liquid fuel supply pipe in a conventional two-fluid spraying panner, and (b) is a diagram of liquid fuel in a conventional two-fluid spraying panner. It is a figure which shows a mode that a supply flow volume is fluctuate | varied largely.

FIG. 14 (a) is a longitudinal sectional view showing a configuration of a two-fluid spraying pan according to Embodiment 8 of the present invention, and FIG. 14 (b) is a cross-sectional view taken along the line PP in FIG. 14 (a).

15] A diagram showing the relationship between the ratio (L / D) of the distance (L) from the spray hole to the diaphragm plate of the two-fluid sprayer and the diameter (D) of the combustion space and the optimum position of the diaphragm plate. is there.

[FIG. 16] (a) is a longitudinal sectional view showing a configuration of a two-fluid spraying pan according to Embodiment 9 of the present invention, (b) is a cross-sectional view taken along line Q-Q in (a), (c ) Is a cross-sectional view corresponding to (b), and is a view showing another structural example of the swing spring.

[FIG. 17] (a) is a longitudinal sectional view showing the configuration of a two-fluid spraying pan according to Embodiment 10 of the present invention, and FIG. 17 (b) is a cross-sectional view taken along line RR in FIG. 17 (a). Surface.

FIG. 18 is a system diagram showing an overview of a fuel cell power generation system according to Embodiment 11 of the present invention.

Explanation of symbols

11 Two-fluid spray panner, 12 Two-fluid sprayer, 13 Combustion space, 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 shape, 25 liquid fuel supply pipe, 25A tip (lower end), 26 washer, 27 sprayer outer cylinder, 27A lower end, 27B upper end, 28 fog Air flow path for atomization, 29 Air inflow hole, 30 Air supply pipe for atomization, 30A tip, 31 Cap, 32, 33 Screw part, Lower part of 31A, 3 IB step, 34 O-ring, 35 washer, 36 coil spring, 37 atomizing gas inlet, 37a upper surface, 37b inner peripheral surface, 38 two-fluid spray nozzle, 38a inner surface (upper surface), 39 nozzle body, 40 groove , 41 Space, 42 Space (concave), 43 Two-fluid merge space, 44 Spray hole, 45 Clearance, 46 Atomizing air, 47 Gaseous fuel supply pipe, 48 Burner outer cylinder, 48a Inner peripheral surface, 49 Gas fuel, 50 Combustion air, 51 Protrusion, 52 Combustion air flow hole, 53 Combustion air flow path, 54 Spark plug, 61 groove, 81 groove, 91 Support, 91a bottom surface, 91a-1 outer part, 92 Atomization air flow path, 93 Atomization air flow section, 101 Combustion air flow hole, 111 Reformer, 112 Combustion furnace, 113 Fuel cell, 121 Throttle plate, 122 Flow hole, 123 Flame, 124 Rotating spring , 125 perforated plate, 126 holes, 127 through holes

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a longitudinal sectional view showing the configuration of a two-fluid spraying panner according to Embodiment 1 of the present invention, FIG. 2 is a transverse sectional view taken along line A—A in FIG. 1, and FIG. 3 is B in FIG. It is a cross-sectional view taken along line B. Fig. 4 (a) is an enlarged vertical cross-sectional view of the two-fluid sprayer provided in the two-fluid spray panner of Fig. 1, and Fig. 4 (b) is a cross-sectional view taken along the CC line in Fig. 4 (a). FIG. 5 (a) is an enlarged longitudinal sectional view showing a lower part of the two-fluid sprayer, and FIG. 5 (b) is a top view showing the two-fluid spray nozzle provided in the two-fluid sprayer. Fig. 5 (a) arrow D direction).

[0053] Based on Figs. 1, 2 and 3, the outline of the two-fluid spray panner 11 of the first embodiment will be described. The two-fluid spray panner 11 has a panner outer cylinder 48. A two-fluid sprayer 12 is disposed in the upper central portion of the PANA outer cylinder 48, and the lower side of the two-fluid sprayer 12 is a combustion space 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 13 are partitioned by a plate 18 as a shield, and a first cylinder as a cylinder for delaying supply of combustion air is formed on the lower surface of the plate 18. 16 and a second cylinder 17 as a cylinder for preventing stagnation are provided.

The configuration of the two-fluid sprayer 12 will be described in detail based on FIG. 4 and FIG. Two fluids The atomizer 12 injects two fluids, ie, 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 therein. 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. Liquid fuel 24 for burner combustion is stored inside the liquid fuel tank 19, and a fine liquid fuel outflow hole 22 is opened at the center of the bottom 21 of the liquid fuel tank 19! / RU 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 supplied from the lower liquid fuel outflow hole 22 to the liquid fuel. It flows out of the tank 19. At this time, the level 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 level 23) is such that the liquid fuel 24 passes through the liquid fuel outflow hole 22. This is the height at which a liquid column head (detailed later) corresponding to the pressure loss during distribution can be obtained. As the liquid fuel 24 for burning PANA, for example, kerosene, heavy oil, alcohol, ether or the like can be used.

The liquid fuel supply pipe 25 has a tip end (lower end) 25 A inserted into the liquid fuel tank 19 from the upper end of the liquid fuel tank 19 downward and into the liquid fuel tank 19. V, placed above the liquid level 23 and in the middle! 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).

It should be noted that the tip end portion 25 A of the liquid fuel supply pipe 25 may be brought into contact with the inner peripheral surface 20 a of the side portion 20 of the liquid fuel tank 19 as shown by a one-dot chain line in FIG. When the supply flow rate of the liquid fuel 24 is small, the tip 25A of the liquid fuel supply pipe 25 is separated from the inner peripheral surface 20a of the liquid fuel tank 19 by force. However, if 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 will flow down along the inner peripheral surface 20a. .

[0059] The liquid fuel tank 19 is disposed concentrically with the atomizer outer cylinder 27 in a cylindrical atomizer outer cylinder 27, and is formed between the side 20 of the liquid fuel tank 19 and the atomizer outer cylinder 27. Space The portion is an atomizing air passage 28 as an atomizing gas passage. An air inflow hole 29 is formed in the sprayer outer cylinder 27, and a tip portion 30 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).

[0060] The two-fluid spray nozzle 38 is attached to the lower end 27A of the sprayer outer cylinder 27, and is a liquid fuel tank.

Located on the lower side of 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. ing. The two-fluid spray nozzle 38 has a disk-like nozzle body 39 and an atomizing air introduction part 37 as an atomizing gas introduction part formed on the nozzle body 39. The peripheral edge of the upper surface of the nozzle body 39 is brought into contact with the lower end surface of the atomizer outer cylinder 27, and the atomizing air introduction part 37 is fitted inside the lower end 27A of the atomizer outer cylinder 27. In the state, it is fixed to the lower end portion 27A of the sprayer outer cylinder 27 by fixing means such as welding.

[0061] The atomizing air introducing 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 (recess) 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). It has been. The space part 41 of the atomizing air introduction part 37 and the space part 42 of the nozzle body part 39 are continuous, and these space parts 41, 42 constitute a two-fluid merge space part 43. In other words, the two-fluid merging space 43 has a circular shape when viewed from above, and has a tapered structure that gradually decreases as the directional force is applied to the diameter 1S spray hole 44. The atomizing air introduction section 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 the top view, and are the central axis of the two-fluid merge space 43 (in the illustrated example, the spray hole 44). (Center axis) is rotationally symmetrical (equally spaced in the circumferential direction).

[0062] 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 is formed by screwing the screw portion 33 formed on the outer peripheral surface of the lower portion 31A with the screw portion 32 formed on the inner peripheral surface of the upper end portion 27B of the sprayer outer tube 27, thereby Up It is attached to the end 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 atomizing air from leaking. The tip 25A of the liquid fuel supply pipe 25 passes through the cap 31, passes through the sprayer outer cylinder 27 (inside the coil spring 36), and is inserted into the liquid fuel tank 19 from the upper end of the liquid fuel tank 19. Yes.

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

[0064] A gap 45 is provided between the washer 26 and the liquid fuel supply pipe 25, and the inner space of the liquid fuel tank 19 and the sprayer outer cylinder outside the liquid fuel tank 19 are provided via the gap 45. It is in communication with 27 internal spaces. That is, the upper end of the liquid fuel tank 19 is open to the inner space of the sprayer outer cylinder 27, and the inner space of the liquid fuel tank 19 and the upper end (upstream portion) of the atomizing air flow path 28 are in communication. . For this reason, the pressure of the atomizing air 46 flowing into the atomizer outer cylinder 27 from the air inflow hole 29 and flowing into the atomizing air flow path 28 is the liquid fuel 24 stored in the liquid fuel tank 19. It also acts on the liquid level 23.

[0065] In this two-fluid sprayer 12, when the liquid fuel for pumping the liquid fuel 24 also sent through the liquid fuel supply pipe 25 flows out from the tip 25A of the liquid fuel supply pipe 25 (comparison) In the case of a relatively high flow rate, it flows out continuously, and in the case of a relatively low flow rate, if it flows out intermittently as illustrated in FIG. 5 (a)), it is temporarily stored in the liquid fuel tank 19. 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. Next, until the liquid fuel 24 flows out from the tip 25A of the liquid fuel supply pipe 25, During this period, the phenomenon that the liquid level 23 decreases is repeated, and the flow rate of the liquid fuel 24 flowing out of the liquid fuel outflow hole 22 slightly changes in response to this liquid level fluctuation. Is slightly smaller than the conventional flow rate fluctuation.

[0066] On the other hand, the atomizing air sent from the air supply pump through the atomizing air supply pipe 30

46 flows into the sprayer outer cylinder 27 from the air inflow hole 29 and flows downward in the atomizing air flow path 28 between the liquid fuel tank 19 and the sprayer outer cylinder 27. Thereafter, the atomizing air 46 is introduced into the two-fluid merging space 43 by increasing the flow velocity by flowing through the groove 40 of the atomizing air introducing portion 37 in the two-fluid spray nozzle 38. It turns 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 mixed well, and the liquid fuel 24 is atomized by the atomizing air 46 and the atomizing air 46 together with the atomizing air 46. Then, it 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 Ή has the liquid fuel 24 flowing through the liquid fuel outflow hole 22. Pressure loss Δ P (hole), kinetic energy E of liquid fuel 24 flowing out from liquid fuel outflow hole 22, and pressure loss Δ Pair of atomizing air 49 in groove 40 etc. Find the power S you want.

Liquid column head Ή = Pressure loss Δ Ρ (hole) + Kinetic energy Ε—Pressure loss Δ Pair Kinetic energy E is obtained by the following formula: Flow velocity V of liquid fuel 24, density p and force of liquid fuel 24, etc. Can do.

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 through the liquid fuel supply pipe 25. That is, when the output of the fuel supply pump is adjusted to increase the supply flow rate of the liquid fuel 24, the liquid level 23 becomes higher, and when the supply flow rate of the liquid fuel 24 is reduced, the liquid level 23 becomes lower. Therefore, the height of the liquid fuel tank 19 is set to a height corresponding to the change in the height of the liquid level 23 according to the predetermined range of the supply flow rate of the liquid fuel 24. [0069] The liquid fuel 24 is sprayed in a conical shape from the spray hole 44 as illustrated in FIG. 5 (a). The spread (spray angle) of the spray at this time is the cross-sectional area of the groove 40 (that is, the groove). This is determined by the flow velocity of the atomizing air 46 when passing through 40) and the size of the spray hole 44 (ie, hole diameter).

[0070] 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 nebulizer outer cylinder 27, and a cylindrical space between the gaseous fuel supply pipe 47 and the atomizer outer cylinder 27 serves as the gaseous fuel flow path 14. The gas fuel 49 for burner supplied from the gaseous fuel supply system flows downward through 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. For example, methane, ethane, propane, butane, dimethyl ether, hydrogen, etc. can be used as the gaseous fuel 49 for burner combustion. The remaining reformed gas that is not used for power generation but returned to the two-fluid spray burner 11 can also be used (see Figure 13).

The Panna outer cylinder 48 has a cylindrical shape and surrounds the periphery of the gaseous fuel supply pipe 47. The Pana outer cylinder 48 and the gaseous fuel supply pipe 47 are concentrically provided, and a cylindrical space between the Pana outer cylinder 48 and the gaseous fuel supply pipe 47 is connected to the first combustion air flow path 15. It has become. Therefore, 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.

Then, a plate 18 is provided between the lower end portion of the combustion air flow path 15, that is, between the lower end portion of the gaseous fuel supply pipe 47 and the lower end portion of the PANA outer cylinder 48. The plate 18 is an annular plate and partitions the combustion air flow path 15 and the combustion space 13. In this case, in the illustrated example, the force S in which the plate 18 is installed at substantially the same height as the two-fluid spray nozzle 38 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, so that the plate 18 is as high as the two-fluid spray nozzle 38 as illustrated. 1S Most reasonable and reasonable.

[0073] The inner peripheral surface of the plate 18 is fixed to the outer peripheral surface of the gaseous fuel supply pipe 47 by a fixing means such as welding. On the other hand, a plurality of projections 51 (four in the illustrated example) 51 are formed on the outer peripheral surface of the plate 18, and the tip surfaces of these projections 51 are fixed to the inner peripheral surface of the PANA outer cylinder 48 by welding or the like. It is fixed by means. For this reason, the force that is blocked by the plate 18 from the gaseous fuel supply pipe 47 to the vicinity of the Panna outer cylinder 48 is formed on the outer periphery of the plate 18 by the protrusion 51 and the inner surface of the burner outer cylinder 48 by the projection 51. Clearances are formed between the peripheral surface 48a, and these clearances 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, whereby the two-fluid spray nozzle 38 (spray hole 4 4), the air flows into the combustion space 13 through the combustion air circulation hole 52.

[0075] 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 inside the combustion air circulation hole 52 and is arranged concentrically with the PANA outer cylinder 48. A cylindrical space force between the PANA outer cylinder 48 and the first cylinder 16 is 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 passage 53 and spreads throughout the combustion space 13. Therefore, a part of the combustion air 50 flowing out from the combustion air flow channel 53 (for example, about 30% of the whole) is transferred to the liquid fuel 24 sprayed from the two-fluid sprayer 12 (two-fluid spray nozzle 38). The liquid fuel 24 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 air ratio is 1.5 or less. The remainder of the combustion air 50 (for example, about 70% of the whole) from which the combustion air flow path 53 has also flowed flows further downward and is mixed with the combustion exhaust gas generated by the combustion. A large amount of combustion exhaust gas is generated.

[0077] The purpose of installing the first cylinder 16 is to delay the partial force S of the combustion air 50 and the supply to the atomized liquid fuel 24, that is, atomize at a position away from the plate 18 downward. Liquid fuel It is possible to prevent the flame from coming into contact with the plate 18 and soot from adhering to the plate 18. 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 (distance from the spray hole 44 of the two-fluid spray nozzle 38 to the combustion air circulation hole 52. ) To set as appropriate.

That is, the first air 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 flow hole 52 on the outer periphery of the plate 18. A part of the combustion air 50 that has passed through the combustion air circulation hole 51 is supplied to the atomized liquid fuel 24 at a position away from the plate 18 downward. As the distance from the spray hole 44 to the combustion air flow hole 52 becomes longer, 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. Note that the larger the plate 18 is and the longer the distance from the spray hole 44 to the combustion air circulation hole 52 is, the larger the diameter of the two-fluid spray pan 11 is.

[0079] 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 pan 11 or the like, only the plate 18 and the combustion air circulation hole 51 are provided. In this case, it may not be possible to sufficiently delay the supply of a part of the combustion air 50 to the atomized liquid fuel 24.In this case, it is very effective to provide the first cylinder 16 as shown in the figure. It is. 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. In other words, the leading end (lower end) of the first cylinder 16 cannot be extended to the outer portion 24A of the sprayed liquid fuel 24.

[0080] 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 plate 18 to the outer portion 24A of the atomized liquid fuel 24 The first cylinder 16 cannot be lengthened too much because the distance of is also shortened. Therefore, taking these restrictions into consideration, 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. do it. 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 the stagnation (convection) of the atomized liquid fuel 24 in the vicinity of the plate 18, so that the flame contacts the plate 18 and sticks to the plate 18. Is to prevent. For this 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 is positioned outside (upper) the outer portion 24A of the atomized liquid fuel 24. There is a need. That is, the tip (lower end) of the second cylinder 17 can only extend to the outer portion 24 A of the atomized liquid fuel 24! /.

For example, as shown in FIG. 1, 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. In this case, the length L2 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 needs to satisfy 0 <L2≤Lltan 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 conditions are the length from the tip (lower end) of the two-fluid spray nozzle 38 (spray hole 44) to the tip (lower end) of the first cylinder 16 and the entire length of the first cylinder 16! The same goes for /. The distance from the spray hole 44 of the two-fluid spray nozzle 38 to the second cylinder 16 is, for example, 50 or more times or 60 or more times the hole diameter (for example, about 1 mm) of the spray hole 44.

[0083] As described above, according to the two-fluid spraying pan 11 of the first embodiment, the cylindrical side portion

20 and a bottom portion 21 provided at the lower end of the side portion 20, and stores the liquid fuel 24 supplied from the liquid fuel supply pipe 25, and is positioned below the liquid level of the stored liquid fuel 24. A liquid fuel tank 19 configured to discharge the stored liquid fuel 24 from a liquid fuel outflow hole 22 opened in the bottom 21 is provided, and the liquid fuel 24 flowing out from the liquid fuel outflow hole 22 of the liquid fuel tank 19 is With the configuration in which the atomized air 46 is atomized and burned, even when the liquid fuel 24 is intermittently supplied from the liquid fuel supply pipe 24 to the liquid fuel tank 19, the liquid fuel outflow hole of the liquid fuel tank 19 From 22, the liquid fuel stored in the liquid fuel tank 19 flows out continuously. In other words, the supply flow rate of the pump of the liquid fuel supply system decreases, and the liquid fuel 24 flows from the liquid fuel supply pipe 25 to the liquid fuel tank 19. Even when it is supplied in short, the liquid level 23 of the liquid fuel 24 stored in the liquid fuel tank 19 slightly fluctuates up and down, and the outflow rate of the liquid fuel 24 from the liquid fuel outflow hole 22 slightly fluctuates. Therefore, the liquid fuel supply flow rate does not fluctuate as shown in Fig. 13. For this reason, even when the liquid fuel supply flow rate is low, the stable supply of the liquid fuel 24 becomes possible, and it becomes easy to establish stable combustion, and there is no possibility of causing unburned exhaust gas and misfire.

[0084] In addition, according to the two-fluid spraying pan 11 of the first embodiment, the liquid fuel 22 flowing out from the liquid fuel outflow hole 22 and flowing into the two-fluid merging space 43 becomes the atomizing air flow. After flowing down the channel 28 and flowing in the groove 40 in the atomizing air introduction section 37 and joining the atomizing air led to the two-fluid merge space section 43 and the two-fluid merge space section 43, Since the atomizing air is sprayed from the atomizing hole 44, the liquid fuel 24 has a flow velocity increased in the groove 40 (the velocity component in the horizontal direction has increased) and the atomizing air 46 and the two-fluid merge. After being well mixed in the space 43, it is sprayed from the spray hole 44 of the two-fluid spray nozzle 38. For this reason, the two-fluid merge space 43 and the groove 40 are not provided! /, Compared to the case, the spread angle of the spray of the liquid fuel 24 is increased, and the liquid fuel 24 is surely atomized. The flammability of fuel 24 is improved.

[0085] Further, according to the two-fluid spray pan 11 of the first embodiment, the groove 40 of the atomizing air introduction section 37 is along the tangential direction of the circumference of the two-fluid merge space section 43 in a top view. In this way, 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 reliable. To be 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.

[0086] Further, according to the two-fluid spray pan 11 of Embodiment 1, the groove 40 of the atomizing air introduction section 37 has a rotationally symmetrical positional relationship around the central axis of the two-fluid merge space section 43. Therefore, 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 is made uniform to improve the combustibility of the liquid fuel 24. be able to.

[0087] Further, according to the two-fluid spraying pan 11 of Embodiment 1, the liquid fuel tank 19 is moved down. The bottom 21 of the fuel tank 19 is structured such that the bottom 21 of the liquid fuel tank 19 is pressed against and closely adhered to the atomizing air introduction part 37 of the two-fluid spray nozzle 38. When the lower surface 21b of the liquid crystal and the upper surface 37a of the atomizing air introducing portion 37 are in close contact with each other, it is possible to prevent a gap from being formed between the contact surfaces 21b and 37a. For this reason, the atomizing air 46 can be prevented from flowing through portions other than the groove 40, and the effect of wide-area spraying by the groove 40 can be sufficiently exhibited.

[0088] Further, according to the two-fluid spray partner 11 of the first embodiment, the two-fluid merge space portion 43 has an inverted conical shape, and the spray hole 44 is formed at the apex position of the inverse-conical space portion 43. Because of this, it is possible to more reliably perform the mixing S of the liquid fuel 24 and the atomizing air 46 in the two-fluid merge space 43. 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.

[0089] Further, according to the two-fluid spraying pan 11 of the first embodiment, the cylindrical shape formed between the sprayer outer cylinder 27 and the gaseous fuel supply pipe 47 surrounding the periphery of the sprayer outer cylinder 27. The gas fuel flow path 14 is provided, and the gas fuel 49 flows downward through the gas fuel flow path 14 and is injected from the lower end of the gas fuel flow path 14 to be burned. Since the gaseous fuel 49 injected from 14 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.

[0090] Further, the two-fluid spraying pan 11 according to the first embodiment is! /, In contact with the inner peripheral surface 20a of the side portion 20 of the liquid fuel tank 19 and the tip portion 25A force of the liquid fuel supply pipe 25. In this case, even when the amount of liquid fuel 24 flowing out from the liquid fuel supply pipe 25 is small, the liquid fuel 24 flows down along the inner peripheral surface 20a, so that the liquid fuel 24 flows out of the liquid fuel outflow hole 22. Can be made more stable. 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 if the liquid level 23 is very low, the liquid fuel 24 temporarily becomes liquid. Force that may cause the outflow of the liquid fuel 24 due to the exposure of the fuel outflow hole 22 If the liquid fuel 24 flows down along the inner peripheral surface 20a of the liquid fuel tank 19, such troubles can be prevented. be able to.

[0091] Furthermore, according to the two-fluid spray pan 11 of the first embodiment, the combustion air flow path 15 The combustion air 50 that has flowed downward is blocked by the plate 18 and guided to the outer peripheral side of the plate 18, away from the two-fluid spray nozzle 38, and passes through the combustion air circulation hole 52 for combustion. Since it is configured to flow into the space 13, the combustion space 13 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. For this reason, the combustion air 50 and the liquid fuel 24 can be appropriately mixed by supplying the combustion air once (1 stage), and a large amount of combustion exhaust gas that does not overcool the flame is generated. It can be made. That is, it is possible to realize a two-fluid spray panner that can generate a large amount of combustion exhaust gas with a simple configuration and that does not cause unburned gas generation or misfire.

In addition, since the combustion air 50 is caused to flow into the combustion space 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 Can be moved away from Therefore, the position of the flame also moves downward from the plate 18, and it is possible to prevent soot 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 caused by soot and abnormal heating of the two-fluid sprayer 12 caused by soot absorbing the radiant heat of the flame may occur. By preventing the possibility of flaws from adhering to the lower surface of the plate 18 as described above, the force S can be prevented from occurring.

In addition, according to the two-fluid spraying pan 11 of the first embodiment, the first cylinder 16 for delaying the supply of combustion air that extends downward from the lower surface of the plate 18 is provided. A cylindrical combustion air flow path 53 that communicates with the combustion air circulation hole 52 is formed between the combustion air flow hole 52 and the combustion air 50 passing through the combustion air circulation hole 52. After flowing downward in the flow path 53, the combustion air flow path 53 flows into the combustion space 13 from the lower end of the combustion air flow path 53, so that a part of the combustion air 50 was sprayed from the two-fluid spray nozzle 38. The supply to the liquid fuel 24 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. Therefore, the position of the flame also moves away from the plate 18, and it is possible to prevent the soot from adhering to the lower surface of the plate 18. It should be noted 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. If the first cylinder 16 for delaying the supply of combustion air as in Example 1 is provided, the position where a part of the combustion air 50 is supplied to the liquid fuel 24 is more reliably moved downward from the plate 18. Can do.

[0095] In addition, due to the size limitation of the two-fluid spray pan 11 and the like, the plate 18 cannot be made too large, and a sufficient distance from the two-fluid spray nozzle 38 to the combustion air circulation hole 52 can be secured. If this is not possible, the amount of combustion air 50 supplied to the liquid fuel 24 may be too large and the flame may be overcooled. On the other hand, if the first cylinder 16 for delaying the supply of combustion air as in the first embodiment is provided, the position where a part of the combustion air 50 is supplied to the liquid fuel 24 is lowered from the plate 18. At this time, it is possible to reduce the amount of a part of the combustion air 50 supplied to the liquid fuel 24 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 partner 11 can be downsized. You can also.

Further, according to the two-fluid spraying pan 11 of Embodiment 1, the second cylinder 17 for preventing stagnation extending downward from the lower surface of the plate 18 is used as the first cylinder for delaying the supply of combustion air. By being provided inside 16, 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. Therefore, 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 in the combustion space 13 are obtained by surrounding the flame with the burner outer cylinder 48. Can be mixed well, and the combustibility is improved.

FIG. 6 (a) is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray panner according to Embodiment 2 of the present invention, and FIG. 6 (b) is provided in the two-fluid sprayer. FIG. 9 is a top view (a view in the direction of arrow E in FIG. 6 (a)) showing a two-fluid spray nozzle extracted. [0099] 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 section 37. Is formed. 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 the top, and the central axis of the two-fluid merge space 43 (in the illustrated example, the spray hole 44 4 Center axis) and a rotationally symmetrical positional relationship (equally spaced in the circumferential direction).

[0100] In this two-fluid sprayer 21, the atomizing air 46 that has flowed downward through the atomizing air flow path 28 46 flows through the groove 61 of the atomizing air introduction section 37 in the two-fluid spray nozzle 38. Is introduced into the two-fluid merging space 43 in a state where the flow velocity is increased, and the two-fluid merging space 43 merges with the liquid fuel 24 flowing out from the liquid fuel outlet hole 22 of the liquid fuel tank 19. (Mix). As a result, the liquid fuel 24 and the atomizing air 46 are mixed well, and the liquid fuel 24 is atomized by the atomizing air 46 and the atomizing air 46 together with the two-fluid spray nozzle 38. The fuel is injected from the spray hole 44 into the combustion space 13.

[0101] The configuration of the other parts of the two-fluid sprayer 12 of Fig. 6 is the same as that of the two-fluid sprayer 12 of the first embodiment (Fig. 4). In addition, the configuration of the parts other than the two-fluid sprayer 11 in the two-fluid spray partner 11 of the second embodiment is also the same as that of the two-fluid spray partner 11 of the first embodiment (FIGS. 1 to 3).

[0102] According to the two-fluid spray burner 11 of the second embodiment, the following operational effects can be obtained. In addition, the same operational effects as the first embodiment can be obtained.

That is, according to the two-fluid spraying pan 11 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 merging space part 43 in a top view. As a result, in the two-fluid merge space 43, the atomizing air 46 collides with the liquid fuel 24 and is mixed with the liquid fuel 24, so that the liquid fuel 24 and the atomizing air 46 are more reliably connected. Mixed. Therefore, 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.

[0104] Moreover, since the groove 61 of the atomizing gas introduction part 37 is formed in plural so as to be rotationally symmetrical about the central axis of the two-fluid merge space part 43, the two-fluid spray nozzle 38 Fountain The distribution amount in the circumferential direction of the liquid fuel 24 sprayed from the fog hole 44 can be made uniform, and the combustibility of the liquid fuel 24 can be improved.

FIG. 7 (a) is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray panner according to Embodiment 3 of the present invention, and FIG. 7 (b) is provided in the two-fluid sprayer. FIG. 9 is a top view (a view in the direction of arrow F in FIG. 7 (a)) showing a two-fluid spray nozzle.

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

On the other hand, the atomizing air introducing 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 abuts so that the outer portion 21b-1 (tapered surface portion) of the lower surface 21b of the bottom portion 21 fits into the inner peripheral surface 37b (tapered surface portion) of the atomizing air introduction portion 37. In the state, it is installed on the atomizing air introduction section 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 bottom surface 21b of the bottom 21 of the liquid fuel tank 19 is fogged. It is pressed against and closely adheres to the inner peripheral surface 37b (taper surface portion) of the chemical air introducing portion 37 to prevent a gap from being formed between these contact surfaces 21b-1 and 37b.

[0108] The nozzle body portion 39 of the two-fluid spray nozzle 38 has an inverted conical space portion (concave portion) 42 formed at the center thereof, and the center thereof (the apex position of the inverted conical space portion 42). A fine spray hole 44 is formed. The space part 41 of the atomizing air introduction part 37 and the space part 42 of the nozzle body part 39 are continuous, and these space parts 41, 42 constitute a two-fluid merge space part 43. In other words, the two-fluid merging space 43 has a circular shape in plan view (top view), and has a tapered structure in which the diameter gradually decreases as the directional force is applied to the spray hole 44. The atomizing air introduction section 37 has grooves (slits) 40 formed at two locations in the circumferential direction. these The groove 40 of FIG. 5 is of a swivel type similar to the groove 40 of FIG. 5, and is along the tangential direction of the circumference of the two-fluid merge space 43 in the top view and is the central axis of the two-fluid merge space 43 with respect to each other. It has a rotationally symmetrical positional relationship (equal intervals in the circumferential direction). The groove formed in the atomizing air introduction part 37 is not limited to the swivel type but may be a collision type similar to that shown in FIG.

[0109] The configuration of the other parts of the two-fluid sprayer 12 of Fig. 7 is the same as that of the two-fluid sprayer 12 of the first embodiment (Fig. 4). In addition, the configuration of the portion other than the two-fluid sprayer in the two-fluid spraying pan 11 of the third embodiment is the same as that of the two-fluid spraying pan 11 of the first embodiment (FIGS. 1 to 3). is there.

[0110] According to the two-fluid spray burner 11 of the third embodiment, the following functions and effects can be obtained. In addition, the same functions and effects as the first and second embodiments can be obtained. .

That is, according to the two-fluid spraying pan 11 of Embodiment 3, the liquid fuel tank 19 has a tapered surface portion of the liquid fuel tank 19 (the outer portion 21b-1 of the lower surface 21b of the bottom portion 21) is fogged. Since it is installed on the atomizing gas introduction part 37 in a state of being fitted into and abutted with the tapered surface part (inner peripheral surface 37b) of the gas introduction part 37, the liquid fuel tank 19 and the two-fluid spray nozzle It is easy to align the center axis of ZUNORE 38. Accordingly, the width of the atomizing air passage 28 where the liquid fuel tank 19 is not displaced 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, it is possible to secure 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) with the force S.

[0112] In the two-fluid spraying pan 11 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 pressed. Pressing against the atomizing air introduction part 37 of the two-fluid spray nozzle 38, the tapered surface part (outer part 21b-1) of the bottom part 21 of the fuel tank 19 and the taper surface part (inner peripheral surface 3) of the atomizing air introduction part 37 By adhering to 7b), it is possible to prevent force S from forming a gap between these contact surfaces 21b-1 and 37b. For this reason, it is possible to prevent the atomizing air 46 from flowing through the portion other than the groove 40 and to sufficiently exhibit the effect of wide area spraying by the groove 40.

FIG. 8 (a) is a two-fluid spray in the two-fluid spray pan according to Embodiment 4 of the present invention. Fig. 8 (b) is a vertical cross-sectional view showing the structure of the lower part of the vessel (Fig. 8 (b) is a vertical cross-sectional view taken along the line G-G). Fig. 8 (c) is a view from the direction of the arrow I in Fig. 8 (b), Fig. 8 (d) is a JJ line in Fig. 8 (a). FIG.

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

[0115] 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! /, (A separate object may be fixed by welding, 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 where 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 (taper surface portion) of the bottom surface 21b of the bottom portion 21 of the liquid fuel tank 19 becomes a two-fluid spray nozzle. The inner surface 38a (tapered surface portion) of 38 is pressed against and closely contacts to prevent a gap between these contact surfaces 21b-1 and 38b.

[0116] In addition, an inverted conical space formed at the center of the two-fluid spray nozzle 38 by the inner surface 38a of the tapered structure 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 43 has a circular shape in plan view (top view), and has a tapered structure in which the diameter gradually decreases as the directional force is applied to the spray hole 44.

[0117] Then, on the bottom surface 21b side of the bottom 21 of the liquid fuel tank 19, grooves are formed at two locations in the circumferential direction.

(Slit) 71 is formed. These grooves 71 are of a swivel type and have a top view. The two fluid merging space portion 43 has a rotationally symmetrical positional relationship (equally spaced in the circumferential direction) along the tangential direction of the circumference of the two fluid merging space portion 43 and around the central axis of the two fluid merging space portion 43.

Accordingly, the atomizing air 46 that has flowed downward through the atomizing air flow path 28 flows through the groove 71 in the bottom portion 21 of the liquid fuel tank 19 so as to increase the flow velocity. It is introduced into the merge space 43 and turns into the two-fluid merge 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 and the atomizing hole 46 together with the atomizing air 46. 44 is injected into the combustion space 13.

[0119] The configuration of other parts of the two-fluid sprayer 12 in Fig. 8 is the same as that of the two-fluid sprayer 12 in the first embodiment (Fig. 4). In addition, the configuration of the parts other than the two-fluid sprayer in the two-fluid spray partner 11 of Embodiment 4 is the same as that of the two-fluid spray partner 11 of Embodiment 1 (FIGS. 1 to 3).

[0120] According to the two-fluid spraying pan 11 of the third embodiment, the following operational effects can be obtained. In addition, the same operational effects as the first embodiment can be obtained.

[0121] That is, according to the two-fluid spray partner 11 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 portion 43 is converted into the atomizing air flow. After flowing down the passage 28 and flowing in the groove 71 at the bottom 21 of the liquid fuel tank 19 and joining the atomizing air 46 led to the two-fluid merge space 43 and the two-fluid merge space 43 As a result of spraying from the spray hole 44 together with the atomizing air 46, the liquid fuel 24 has increased the flow velocity in the groove 71 (the velocity component in the horizontal direction has increased) and the atomizing air 46. The fluid is mixed well in the fluid merge space 43 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.

[0122] Further, the liquid fuel tank 19 is configured 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 (the inner surface 38a) of the two-fluid spray nozzle 38. In this state, the liquid fuel tank 19 and the two-fluid spray nozzle 38 can be easily aligned with the central axis. Therefore, liquid fuel The width of the atomizing air flow path 28 where the side of the material tank 19 moves can be made uniform in the circumferential direction, and the flow of the atomizing air 46 in the atomizing air flow path 28 can be made uniform in the circumferential direction. Therefore, it is possible to ensure 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).

[0123] Further, the groove 71 of the bottom 21 of the liquid fuel tank 19 is formed so as to be along the tangential direction of the circumference of the two-fluid merge space 43 in a top view, so that the two-fluid merge space 43 is atomized. Since the working air 46 is swirled and mixed with the liquid fuel 24, the liquid fuel 24 and the atomizing air 46 are more reliably mixed by force. Therefore, 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.

[0124] Further, since the groove 71 of the bottom 21 of the liquid fuel tank 19 is formed in a plurality so as to have a rotationally symmetrical positional relationship around the central axis of the two-fluid merge space 43, the two-fluid spray nozzle 38 has The distribution amount in the circumferential direction of the liquid fuel 24 sprayed from the spray holes 44 can be made uniform, and the combustibility of the liquid fuel 24 can be improved.

[0125] Further, in the two-fluid spraying pan 11 of the fourth embodiment, the bottom 21 of the liquid fuel tank 19 is removed by pressing the liquid fuel tank 19 downward by the coil spring 36 (see Fig. 4). By pressing the fluid spray nozzle 38 against the tapered surface portion (outer portion 21b-1) of the bottom 21 of the fuel tank 19 and the tapered surface portion (inner surface 38a) of the two-fluid spray nozzle 38, these contact surfaces are brought into close contact with each other. It is possible to prevent a gap from being formed between 21b-1 and 38a. For this reason, the atomizing air 46 can be prevented from flowing through portions other than the groove 71, and the effect of wide-area spraying by the groove 71 can be sufficiently exhibited.

FIG. 9 (a) is a longitudinal sectional view showing the configuration of the lower part of the two-fluid sprayer in the two-fluid spray panner according to Embodiment 5 of the present invention (cross-sectional view taken along line KK in FIG. 9 (b)). Fig. 9 (b) is a bottom view of the liquid fuel tank provided in the two-fluid sprayer. Fig. 9 (c) is a bottom view of Fig. 9 (a). It is a cross-sectional view taken along line M—M.

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

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! /, (A separate object may be fixed by welding, 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 has a two-fluid spray in a state where the outer portion 21b-1 (tapered surface) of the bottom 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, by pressing the liquid fuel tank 19 downward by the coil spring 36 (see FIG. 4), the outer portion 21b-1 (taper surface portion) of the bottom surface 21b of the bottom portion 21 of the liquid fuel tank 19 becomes a two-fluid spray nozzle. The inner surface 38a (tapered surface portion) of 38 is pressed against and closely contacts to prevent a gap between the contact surfaces 21b-1 and 38b.

In addition, an inverted conical space formed at the center of the two-fluid spray nozzle 38 by the tapered inner surface 38a 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 43 has a circular shape in plan view (top view), and has a tapered structure in which the diameter gradually decreases as the directional force is applied to the spray hole 44.

[0130] Then, on the bottom surface 21b side of the bottom 21 of the liquid fuel tank 19, grooves are formed at four locations in the circumferential direction thereof.

(Slit) 81 is formed. These grooves 81 are of a collision type, and have a rotationally symmetrical positional relationship (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. At equal intervals).

Accordingly, the atomizing air 46 that has flowed downward through the atomizing air flow path 28 flows into the two fluids in a state where the flow velocity is increased by flowing through the groove 81 at the bottom 21 of the liquid fuel tank 19. It is introduced into the 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. The result As a result, the liquid fuel 24 and the atomizing air 46 are mixed well, and the liquid fuel 24 is atomized by the atomizing air 46, and the atomizing air 46 and the spray hole 44 of the two-fluid spray nozzle 38 are used. Then, it is injected into the combustion space 13.

[0132] The configuration of the other parts of the two-fluid sprayer 12 in Fig. 9 is the same as that of the two-fluid sprayer 12 in the first embodiment (Fig. 4). In addition, the configuration of the portion other than the two-fluid sprayer in the two-fluid spray pan 11 of the fifth embodiment is also described in the above embodiment.

This is the same as the two-fluid spraying pan 11 of FIG.

[0133] According to the two-fluid spraying pan 11 of the fifth embodiment, the following embodiment is described as follows.

The same operational effects as those of the fourth embodiment can be obtained, and the same operational effects as those of the first embodiment can be obtained.

That is, according to the two-fluid spray partner 11 of the fifth embodiment, the liquid fuel 24 flowing out from the liquid fuel outflow hole 44 and flowing into the two-fluid merge space 43 flows into the atomizing air flow. After flowing down the passage 28 and flowing in the groove 81 at the bottom 21 of the liquid fuel tank 19 to the two-fluid merging space portion 43 and the merging air 46 after merging in the two-fluid merging space portion 43 As a result of spraying from the spray hole 44 together with the atomizing air 46, the liquid fuel 24 has increased the flow velocity in the groove 81 (the velocity component in the horizontal direction has increased). The fluid is mixed well in the fluid merge space 43 and sprayed from the spray hole 44. For this reason, compared with the case where the two-fluid merge 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 surely atomized. Will improve.

Furthermore, the liquid fuel tank 19 is configured 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 (the inner surface 38a) of the two-fluid spray nozzle 38. In this state, the liquid fuel tank 19 and the two-fluid spray nozzle 38 can be easily aligned with the central axis. Therefore, the width of the atomizing air passage 28 where the liquid fuel tank 19 is offset 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, it is possible to secure 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).

[0136] Further, the groove 81 of the bottom 21 of the liquid fuel tank 19 has a two-fluid merge space portion in a top view. By forming it along the tangential direction of the circumference of 43, the atomizing air 46 is swirled in the two-fluid merge space 43 and mixed with the liquid fuel 24. Air 46 and force are more reliably mixed. Therefore, 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.

[0137] In addition, since the groove 81 of the bottom 21 of the liquid fuel tank 19 is formed in a plurality of rotationally symmetrical positions around the central axis of the two-fluid merge space 43, the two-fluid spray nozzle 38 has The distribution amount in the circumferential direction of the liquid fuel 24 sprayed from the spray holes 44 can be made uniform, and the combustibility of the liquid fuel 24 can be improved.

[0138] Further, in the two-fluid spraying pan 11 of the fourth embodiment, the bottom 21 of the liquid fuel tank 19 is removed by pressing the liquid fuel tank 19 downward by the coil spring 36 (see Fig. 4). By pressing the fluid spray nozzle 38 against the tapered surface portion (outer portion 21b-1) of the bottom 21 of the fuel tank 19 and the tapered surface portion (inner surface 38a) of the two-fluid spray nozzle 38, these contact surfaces are brought into close contact with each other. It is possible to prevent a gap from being formed between 21b-1 and 38a. For this reason, the atomizing air 46 can be prevented from flowing through portions other than the groove 81, and the effect of wide-area spraying by the groove 81 can be sufficiently exhibited.

Fig. 10 (a) is a longitudinal sectional view showing the configuration of the lower part of the two-fluid atomizer in the two-fluid atomizing pan according to Embodiment 6 of the present invention, and Fig. 10 (b) is a diagram of Fig. 10 (a). FIG. 6 is a transverse sectional view taken along the line N—N.

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 becomes a tapered surface (inverted conical shape). In addition, a fine liquid fuel outflow hole 22 is formed at the center (the apex position 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 a tapered (inverted truncated cone) taper surface. On the other hand, the two-fluid spray nozzle 38 does not have an atomizing air introduction 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 provided). It may be fixed by welding). The two-fluid spray nozzle 38 has an inner surface (upper surface) 38a having a tapered surface (tapered shape). [0141] A plurality (four in the illustrated example) of support portions 91 project from the lower end portion of the outer peripheral surface 20b 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 91a-1 of the lower surface 91a has a tapered surface inclined inward along the inner surface 38a of the two-fluid spray nozzle 38. It has become. Accordingly, the liquid fuel tank 19 is supported in a state where 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, and as a result, A tapered (inverted truncated cone) gap is secured between the outer surface 21 a of the bottom 21 of the liquid fuel tank 19 and the inner surface 38 a of the two-fluid spray nozzle 38, and this gap is connected to the atomizing air flow path 92. It has become. That is, the outer first atomizing air flow path 28 and the inner two-fluid merging space 43 are communicated via the second atomizing air flow path 92.

[0142] The two-fluid merge space 43 is an inverted conical space formed at the center of the two-fluid spray nozzle 38 by the inner surface 38a of the tapered structure. 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 located below the liquid fuel outflow hole 22 and has a circular shape in plan view (top view), and its diameter gradually decreases as it goes toward the spray hole 44. It becomes a structure!

[0143] The atomizing air 46 that has flowed downward through the atomizing air flow path 28 passes through the atomizing air flow part 93 between the support parts 91 and flows through the atomizing air flow path 92. The two-fluid merging space portion 43 is introduced into the two-fluid merging space portion 43 and merged (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 in the two-fluid merging space portion 43. To do. As a result, the liquid fuel 24 is sprayed into the combustion space portion 13 from the spray hole 44 of the two-fluid spray nozzle 38 together with the atomizing air 46 while being atomized by the atomizing air 46.

[0144] The configuration of other parts of the two-fluid sprayer 12 in Fig. 10 is the same as that of the two-fluid sprayer 12 in the first embodiment (Fig. 4). In addition, the configuration of the portion other than the two-fluid sprayer in the two-fluid spraying panner 11 of the sixth embodiment is the same as that of the two-fluid spraying panner 11 of the first embodiment (FIGS. 1 to 3).

[0145] According to the two-fluid spraying pan 11 of the sixth embodiment, the following operational effects can be obtained, and, in addition, the same operational effects as the first embodiment can be obtained. That is, according to the two-fluid spraying pan 11 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 first atomized. After flowing down the gas flow path 28 for use, it passes through the atomizing air flow section 93 between the support sections 91 and flows through the second atomizing air flow path 92 to the two-fluid merge space section 43. The liquid atomizing hole 46 of the liquid fuel tank 19 is configured such that the atomized air 46 and the atomized air 46 are sprayed from the atomizing hole 44 after being merged in the two-fluid merging space 43. The liquid fuel 24 flowing out of 22 is mixed in the atomizing air 46 and the two-fluid merge space 43 and then injected from the spray hole 44 of the two-fluid spray nozzle 38. For this reason, compared with the case where the two-fluid merge 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. .

FIG. 11 is a longitudinal sectional view showing a configuration of a two-fluid spraying pan according to Embodiment 7 of the present invention, and FIG. 12 is a transverse sectional view taken along line OO in FIG.

As shown in FIGS. 11 and 12, in the two-fluid spray pan 11 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 then the combustion air on the outside of the first cylinder 16. After flowing through the flow path 53, it flows into the combustion space portion 13, but a part flows into the combustion space portion 13 through the combustion air flow hole 101 inside the first cylinder 16.

[0149] It should be noted that the configuration of the other parts of the two-fluid spray partner 11 in FIGS. 11 and 12 is the same as that of the two-fluid spray partner 11 in the first embodiment (FIGS. 1 to 3).

[0150] According to the two-fluid spray pan 11 of the seventh embodiment, the following operational effects can be obtained, and, in addition, the same operational effects as the first embodiment can be obtained.

[0151] That is, according to the two-fluid spraying pan 11 of the seventh embodiment, a plurality of other combustion air circulation holes 101 are formed in the plate 18 inside the combustion air circulation holes 52. As a result, a part of the combustion air 50 also passes through the combustion air circulation holes 101. It is possible to suppress the generation of a stagnation flow of combustion air in the vicinity of the lower surface of the plate 18 due to the flow of the working air 50, and to suppress soot from adhering to the lower surface of the plate 18. In addition, 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 Reny fluid spray nozzle 38 that is overheated by the radiant heat of the flame is provided by this combustion air. If it can be cooled!

[0152] <Embodiment 8>

FIG. 14 (a) is a longitudinal sectional view showing the configuration of a two-fluid spraying pan according to Embodiment 8 of the present invention, FIG. 14 (b) is a cross-sectional view taken along the line PP in FIG. 14 (a), Fig. 15 is a graph showing the relationship between the distance from the spray hole of the two-fluid sprayer to the throttle plate (the ratio (L / D) of U to the diameter (D) of the combustion space and the optimum position of the throttle plate) .

As shown in FIGS. 14 (a) and 14 (b), in the two-fluid spray burner 11 of the present eighth embodiment, a throttle plate 121 is provided in the combustion space portion 13 in the burner outer cylinder 48. It has been. The diaphragm plate 121 has an annular shape with a circular flow hole (diaphragm hole) 122 formed in the center. The diaphragm plate 121 is horizontally disposed at the lower end of the extended PANA cylinder 48 and is positioned below the plate 18 and the first cylinder 16 and fixed to the inner surface of the PANA cylinder 48 by welding or the like. Fixed by means. As shown in FIG. 14 (b), the flow hole 122 of the throttle plate 121 is located in the center of the combustion space 13 in plan view.

Accordingly, the combustion air 50 that has flowed downward through the combustion space 13 is guided to the center of the combustion space 13 by the throttle plate 121 as shown by the arrow in FIG. It passes through the flow hole 122 of the diaphragm plate 121. The diaphragm plate 121 is not necessarily limited to a horizontal plate as shown by a solid line in FIG. 14 (a), but is an inclined plate (inverted truncated cone shape) as virtually shown by a one-dot chain line in FIG. 14 (a). )

[0155] The configuration of the other parts of the two-fluid spray pan 11 of Fig. 14 is the same as that of the two-fluid spray pan 11 of the first embodiment (Figs. 1 to 3).

[0156] Therefore, according to the two-fluid spray pan 11 of the eighth embodiment, the same operation and effect as the first embodiment can be obtained, and the following operation and effect can also be obtained.

That is, according to the two-fluid spraying pan 11 of the eighth embodiment, the throttle plate 121 having the flow hole 121 in the center is provided in the combustion space 13, and the combustion space 13 is directed downward. Flowing Since the combustion air 50 is guided to the central portion of the combustion space 13 by the throttle plate 121 and passes through the flow hole 122 of the throttle plate 121, the combustion air 50 and the unburned gas ( The sprayed liquid fuel is heated and vaporized and is still burned! As a result, combustion of unburned gas is promoted, so that the fuel can be completely burned and the flame 123 can be shortened.

More specifically, the combustion air 50 that flows through the combustion air passage 53 and flows into the combustion space 13 from the lower end of the combustion air passage 53 (combustion when the first cylinder 16 is not provided) Combustion air 50) that has flowed into the combustion space 13 through the air flow hole 52 and flows into the combustion space 13 is spread downward to the center of the combustion space 13 and uncombusted. It is mixed with gas to burn the unburned gas. However, the combustion air 50 does not readily reach the center of the combustion space 13, and a part of the combustion air 50 flows further downward without being mixed with the unburned gas. For this reason, when there is no throttle plate 12 in the combustion space 13, the mixing of the combustion air 50 and the unburned gas is delayed, so that unburned fuel (unburned gas) tends to remain, and the flame 123 also become longer.

On the other hand, when the throttle plate 121 is provided in the combustion space portion 13 as described above, the combustion air 50 that has flowed downward is blocked by the throttle plate 121 and the central circulation hole 122. In other words, since the gas is guided to the center of the combustion space 13, the mixing of the combustion air 50 and the unburned gas is promoted, and the combustion of the unburned gas is promoted. For this reason, CO is reduced as the fuel easily burns, and the flame 123 is shortened.

[0160] Moreover, according to the two-fluid spraying pan 11 of the eighth embodiment, the fluid such as combustion air is once squeezed by the flow hole 122 of the throttle plate 121, so that the fluid flow rate distribution is circumferential. Uniformized. For this reason, the furnace and the like can be uniformly heated in the circumferential direction by the combustion exhaust gas.

[0161] As shown in Fig. 14, if the distance from the spray hole 44 of the two-fluid sprayer 12 to the throttle plate 121 is L, and the inner diameter of the burner outer cylinder 48 (the diameter of the combustion space 13) is D, L / D should be in the range of 2 to 10 (region I in Fig. 15). When L / D is less than 2 (area II in Fig. 15), a relatively large amount of air is supplied at a time to cool the flame, causing the fuel to vaporize and produce droplets. It becomes easy. On the other hand, when L / D is greater than 10 (Fig. 1 In area 5), the rate of unburned gas combustion (reaction with o in the air) is less likely to be promoted because the supply of air becomes slower and the proportion of unburned gas mixed with the temperature increases. .

Further, as shown in FIG. 14, when the diameter of the flow hole 122 of the diaphragm plate 121 is d, d / D is preferably in the range of 0.2 · 0.6. If it is smaller than 0.2, the pressure increase in the combustion space 12 becomes large, and if it is larger than 0.6, the mixing effect of air and unburned gas is weakened.

FIG. 16 (a) is a longitudinal sectional view showing the configuration of the two-fluid spraying pan according to Embodiment 9 of the present invention, and FIG. 16 (b) is a cross-sectional view taken along the line Q-Q in FIG. 16 (a). is there. FIG. 16 (c) is a cross-sectional view corresponding to FIG. 16 (b), and is a view showing another structural example of the swing spring.

As shown in FIGS. 16 (a) to 16 (c), in the two-fluid spray pan 11 of the ninth embodiment, a swirling spring 124 is provided above the throttle plate 121. A plurality of (six) swirling springs 124 are arranged around the circulation hole 122 of the diaphragm plate 12 at regular intervals along the circumferential direction of the circulation hole 122. It is fixed to the inner surface by fixing means such as welding. Each of the swirl springs 124 is provided along a substantially tangential direction of the circular flow hole 122 in plan view. Accordingly, the flow of the combustion air 50 passing through the flow hole 122 of the throttle plate 121 becomes a swirl flow by the swirl spring 124 as shown by the arrows in FIGS. 16 (b) and 16 (c).

[0165] It should be noted that the revolving spring 124 is not limited to the tangential direction of the flow hole 122, and the side surface may be inclined with respect to the radial direction of the flow hole 122 in plan view. Further, the swing spring 124 may be curved as shown in FIG. 16 (c) which may be a flat plate as shown in FIG. 16 (b).

[0166] The configuration of the other parts of the two-fluid spraying panner 11 of Fig. 16 is the same as that of the two-fluid spraying panner 11 of the first and eighth embodiments (Figs. 1 to 3 and 14).

[0167] Therefore, according to the two-fluid spray partner 11 of the ninth embodiment, the same operational effects as those of the first and eighth embodiments can be obtained, and the following operational effects can also be obtained.

That is, according to the two-fluid spraying pan 11 of the ninth embodiment, the rotation spring 124 is provided on the upper side of the throttle plate 121, and the flow of the combustion air 50 passing through the flow hole 122 of the throttle plate 121. The combustion air 55 that has passed through the flow hole 122 of the throttle plate 121 is swirled as shown by the arrow in FIG. 16 (a). It spreads horizontally. As a result, the pressure at the center of the flow of the combustion air 50 decreases below the flow hole 122, so that the combustion air flows from the outside into the center as shown by the arrow in FIG. 50 circulating flows are generated. Therefore, the mixing of the combustion air 50 and the unburned gas is further promoted, and the combustion of the unburned gas is further promoted. Therefore, the fuel is more easily burned, and the flame 123 is further shortened.

FIG. 17 (a) is a longitudinal sectional view showing the configuration of a two-fluid spraying pan according to Embodiment 10 of the present invention, and FIG. 17 (b) is a transverse section taken along the line RR in FIG. 17 (a). is there.

[0170] As shown in Figs. 17 (a) and 17 (c), in the two-fluid spray pan 11 of the tenth embodiment, a plurality of (two in the illustrated example) perforated plates are provided in the combustion space portion 13. 125 is provided. The number of perforated plates 125 is not limited to a plurality, and may be one. The perforated plate 125 is located above the diaphragm plate 121, that is, between the plate 18 (first cylinder 16) and the diaphragm plate 121.

[0171] The perforated plate 125 is an annular plate in which one relatively large-diameter circulation hole 127 is formed in the central portion, and many relatively small-diameter holes 126 are formed in the peripheral portion. The perforated plate 125 is disposed horizontally in the combustion space 13 and is fixed to the inner surface of the PANA outer cylinder 48 by a fixing step such as welding. As shown in FIG. 17B, the flow hole 127 of the perforated plate 125 is located at the center of the combustion space 13 in plan view.

Therefore, a part of the combustion air 50 that has flowed downward through the combustion space 13 is guided to the central circulation hole 127 (ie, the center of the combustion space 13) by the perforated plate 125. The other combustion air 50 passes through the hole 126 and flows downward through the hole 126. For example, in the upper perforated plate 125, 20% of the directional force of the perforated plate 125, that is, the combustion air 50 flowing downward, is led to the center, and 80% flows further downward through the hole 126. In the lower perforated plate 125, 40% of the combustion air 50 that has flowed downward toward the perforated plate 125 is led to the center, and 60% passes through the hole 126 and further down. To flow with

[0173] The configuration of the other parts of the two-fluid spraying panner 11 of Fig. 17 is the same as that of the two-fluid spraying panner 11 of the above-described embodiments 1, 8, and 9 (Figs. 1 to 3 and 14).

[0174] Therefore, according to the two-fluid spray pan 11 of the tenth embodiment, the above-described embodiment is provided. The same effects as 1, 8 and 9 can be obtained, and the following effects can also be obtained.

That is, according to the two-fluid spraying pan 11 of the tenth embodiment, the perforated plate 125 having the circulation hole 127 formed in the center is provided in the combustion space 13 above the throttle plate 121, and the combustion is performed. A part of the combustion air 50 that has flowed downward through the space 13 is guided to the center of the combustion space 13 by the perforated plate 125 and passed through the circulation hole 127 of the perforated plate 125. As a result, the mixing of the combustion air 50 and the unburned gas is further promoted, and the combustion of the unburned gas is further promoted, so that the fuel is more easily burned and the flame 123 is further increased. The flame is shortened.

FIG. 18 is a system diagram showing an outline of a fuel cell power generation system according to Embodiment 11 of the present invention. FIG. 18 shows an example in which the two-fluid spraying pan 11 of any of the above-described embodiments 1 to 10 is used as a heat source of a reformer in a fuel cell power generation system.

As shown in FIG. 18, a reforming furnace 111 is provided with a combustion furnace 112 above the reformer 111, and the two fluids according to any one of the first to tenth embodiments described above from above the combustion furnace 112. Spray pan 11 is inserted. 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 pan 11. The details of the two-fluid spray panner 11 are as described above.

[0178] 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 from the raw material supply system as reforming raw materials. In the reformer 111, the reformed fuel (hydrogen) is reformed by steam reforming the reforming fuel using the heat of a large amount of combustion exhaust gas generated by the combustion in the two-fluid spraying pan 11. (Rich gas). 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 causing an electrochemical reaction between the reformed gas (hydrogen) supplied to the anode side and air (oxygen) supplied to the force sword side. The remaining reformed gas that was not 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. [0179] According to the fuel cell power generation system of Embodiment 1 1 of the present invention, the two-fluid spraying burner 11 of any of the above embodiments;! To 10 is used as a heat source of the reformer 1 1 1. Therefore, when the two-fluid spraying pan 11 exhibits the above-described excellent effects, the performance of the reformer 11 1 1 can be improved and the cost can be reduced.

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

[0181] Further, in the above, the force S provided with the liquid fuel outflow hole at the bottom of the liquid fuel tank is not necessarily limited to this, but 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. The stored liquid fuel may be discharged from one or a plurality of liquid fuel outflow holes that are located below and opened in the side or bottom.

[0182] In the above, the liquid fuel tank is provided in the outer cylinder of the sprayer. However, the liquid fuel tank is not necessarily limited to this. For example, the liquid fuel tank is provided outside the outer cylinder of the sprayer, and the liquid fuel tank liquid is provided. The liquid fuel that has flowed out of the fuel outflow hole may be supplied to the confluence space with the atomizing gas via a pipe or the like.

[0183] In the above, 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 level of the liquid fuel stored in the liquid fuel tank. For example, the upper limit 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 that has flowed out of 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 should be configured to continuously flow out of the liquid fuel outflow hole.

[0184] Further, in the above, two grooves are provided for the swivel type, and four are provided for the collision type, but the present invention is not limited to this, and the force can be an appropriate number. However, in order to ensure the uniformity in the circumferential distribution of the spray amount of liquid fuel, it is desirable that the swivel type has two or more grooves and the collision type has three or more grooves. ! / [0185] 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, etc. are provided (invention). Not only a two-fluid spray panner equipped with a two-fluid sprayer that injects a gas for conversion as a fuel injector, but also a burner equipped with a fuel injector that injects only liquid fuel or a fuel injector that injects gaseous fuel Can be applied.

[0186] Further, in the above, a force that provides a combustion air circulation hole on the outer peripheral side of the plate (shielding plate) by forming protrusions on the outer periphery of the plate (shielding plate) is not limited to this. It is only necessary to provide a combustion air circulation hole on the outer peripheral side of the (shield). For example, a combustion air circulation hole is provided on the outer peripheral side of the plate by making a hole in the peripheral edge of the plate (shielding plate) itself. You may do it.

[0187] Further, in the above, the force S that makes the plate (shielding plate) a horizontal plate, the plate (shielding plate) that is not limited to this 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 shown in FIG. In the case of this inclined plate, the function similar to that of the first cylinder, which delays the supply of combustion air just by keeping the combustion air away from the fuel injection nozzle (two-fluid spray nozzle 38), should also be exhibited. become.

Industrial applicability

[0188] The present invention relates to a panner, and is useful when applied to, for example, a case where a large amount of combustion exhaust gas needs to be generated in order to heat a reformer or the like of a large-capacity fuel cell power generation system. is there.

Claims

The scope of the claims

[1] In a burner that injects and burns fuel from the fuel injection nozzle of the fuel injector to the combustion space below the fuel injection nozzle.

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, thereby being moved away from the fuel injection nozzle, and the combustion air flow A panner that is configured to flow through the hole and flow into the combustion space.

[2] In the panner according to claim 1,

The combustion air that has passed through the combustion air circulation hole flows downward into the other combustion air flow path, and then flows into the combustion space from the lower end of the other combustion air flow path. Pana is characterized by its configuration.

[3] In the panner according to claim 2,

A panner characterized in that 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.

[4] Claim; In the parner according to any one of! To 3,

A burner characterized in that a plurality of other combustion air circulation holes are formed in the shielding plate inside the combustion air circulation holes.

[5] Claim; In the parner according to any one of! To 4,

The fuel injector is for injecting liquid fuel from the fuel injection nozzle, and is tubular between the fuel injector and a gaseous fuel supply pipe surrounding the fuel injector. Forming a gaseous fuel flow path,

The gas fuel is configured so that the gaseous fuel flows downward in the gaseous fuel flow path and is injected and burned from the lower end of the gaseous fuel flow path to the combustion space portion.

[6] Claim; In the parner according to any one of! To 5,

A burner characterized in that combustion air that has flowed downward through the combustion space is guided to the center of the combustion space by the throttle plate and passes through the flow hole of the throttle plate.

[7] In the panner according to claim 6,

A swirl spring is provided on the upper side of the diaphragm plate,

A structure in which the flow of the combustion air passing through the flow hole of the throttle plate is swirled by the swirl spring.

[8] In the panner according to claim 6 or 7,

A perforated plate having a through hole in the center is provided in the combustion space above the throttle plate, and a part of the combustion air that has flowed downward through the combustion space is transferred by the perforated plate. A panner characterized in that it is guided to the central part of the combustion space and passes through the flow hole of the perforated plate.