KR20090034964A - Burner - Google Patents

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

Burner {BURNER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner, and is useful for, for example, applying to a two-fluid spray burner or the like that burns a liquid fuel in an atomized state with a gas for atomization.

A two-fluid atomizing burner burns a liquid fuel in the atomized state with the atomizing gas, and is used as a heat source of a reformer of a fuel cell power generation system, for example. In this case, the reformer generates a reformed gas (gas containing a lot of hydrogen) by steam reforming the reforming fuel such as methane gas or kerosene by using the heat of the combustion exhaust gas generated by the combustion of the air atomizing burner. This reformed gas is supplied to the fuel cell as fuel for power generation.

In the conventional two-fluid atomizing burner, 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 dividing air into two stages has been adopted. In this case, in the first step, the supply air from the air supply source is mixed and combusted with liquid fuel such as kerosene sprayed from the nozzle of the two-fluid atomizing burner, and in the second step, the combustion exhaust gas generated in the combustion of the first step is A large amount of combustion exhaust gas is generated by supplying air from another air supply source at a different location from the air supply site of the first stage.

Patent Document 1: Japanese Unexamined Patent Publication No. 2002-224592

(Tasks to be solved by the invention)

However, in the conventional two-fluid atomizing burner, in addition to the combustion by the first stage air supply, in the second stage, the air is supplied at a different place than the first stage, so that the air supply structure becomes complicated, and the entire apparatus is enlarged. do. In addition, unlike a configuration in which air is divided into one and two stages, when a large amount of air is supplied at a time to generate a large amount of combustion exhaust gas, the flame is excessively cooled by the large amount of air. Since the evaporation rate is lowered and the reaction rate of the fuel and oxygen is lowered, the flame becomes longer, and unburned gas or unburned liquid fuel (mist) is likely to be generated, which may cause misfire.

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 fear of generating or burning unburned gas, etc. An object of the present invention is to provide a burner, such as a two-fluid atomizing burner, which is capable of forming a gas, and uniformizing the flow rate distribution of combustion exhaust gas.

(Means to solve the task)

The burner of the 1st invention which solves the said subject is fuel (gas fuel, liquid fuel, or a liquid body of liquid fuel and gas for atomization) from the fuel injection nozzle of a fuel injector to the combustion space below this fuel injection nozzle. A burner for injecting and combusting a gas, comprising: a cylindrical combustion air flow path formed between the fuel injector and a burner outer cylinder surrounding the fuel injector, and a shield for dividing the combustion air flow path and the combustion space portion. And a combustion air distribution hole provided on the outer circumferential side of the shield plate, wherein the combustion air flowing downward through the combustion air flow path is blocked by the shield plate and guided to the outer circumferential side of the shield plate. And away from the fuel injection nozzle, and flows into the combustion space through the combustion air distribution hole. The.

Moreover, the burner of 2nd invention provides the combustion air supply delay cylinder extended downward from the lower surface of the said shielding plate in the burner of 1st invention, and the said combustion air is passed through this burner outer cylinder. Another combustion air flow path having a cylindrical shape is formed through the flow hole, and the combustion air having passed through the combustion air flow hole flows downward through the other combustion air flow path from the lower end of the other combustion air flow path. Characterized in that the configuration is introduced into the combustion space portion.

In the burner of the third invention, the burner of the third invention includes one or more stagnation prevention cylinders extending downward from the lower surface of the shielding plate inside the cylinder for delaying the supply of air for combustion. It is characterized by the provision.

The burner of the fourth invention is the burner of any one of the first to third inventions, wherein the shielding plate is provided with a plurality of combustion air distribution holes formed inside the shielding air distribution hole. It is characterized by.

The burner of the fifth invention is the burner of any one of the first to fourth inventions, wherein the fuel injector injects liquid fuel from the fuel injection nozzle, and includes a gaseous fuel surrounding the fuel injector. A cylindrical gaseous fuel flow path is formed between the supply pipe and the fuel injector, and the gaseous fuel flows downward through the gaseous fuel flow path, and is injected into the combustion space portion from the lower end of the gaseous fuel flow path to be combusted. It features.

Moreover, in the burner of any one of 1st-5th invention, the burner of 6th invention WHEREIN: The throttle plate which opened the distribution hole in the center part is provided in the said combustion space part, and the said combustion space part flowed down below. The combustion air is guided by the throttle plate to the center portion of the combustion space, and the flow passage of the throttle plate is configured.

In the burner of the seventh aspect of the invention, in the burner of the sixth aspect of the invention, a turning spring is provided on the upper side of the throttle plate, and the flow of the combustion air passing through the flow hole of the throttle plate is provided by the turning spring. It is characterized by the configuration as a swirl flow.

Moreover, in the burner of 8th invention, the burner of 6th or 7th invention WHEREIN: The porous plate which the flow hole opened to the center part is provided in the said combustion space part from the upper side of the throttle plate, and the said combustion space part is downward. A part of the combustion air which flowed in is led to the center part of the said combustion space part by the said porous plate, and it is set as the structure which makes the flow hole of the said porous plate pass.

Moreover, when the burner of any one of said 1st-8th invention is an air atomizing burner, you may make the structure of an air atomizing burner as follows.

That is, the 1st structure is a two-fluid spray burner which the burner of any one of the 1st-8th invention atomizes and burns a liquid fuel with gas for atomization, and is a cylindrical side part in this two-fluid spray burner. And a bottom portion provided at the lower end of the side portion, which stores the liquid fuel supplied from the liquid fuel supply pipe and is located below the liquid level of the stored liquid fuel and is open to the side portion or the bottom portion and outflows to one or more liquid fuels. And a liquid fuel tank having a configuration in which the stored liquid fuel is discharged from the hole, and configured to burn the liquid fuel flowing out of the liquid fuel outflow hole of the liquid fuel tank by atomizing with the atomizing gas. do.

Moreover, in the air atomizing burner of a 2nd structure, the air atomizing burner of a 1st structure WHEREIN: The said liquid fuel outflow hole is opened to the bottom part of the said liquid fuel tank, and the side part of this liquid fuel tank and this side part Located in the lower part of the said liquid fuel outflow hole, it has a cylindrical atomization gas flow path formed between the outer cylinder surrounding a periphery, and is provided in the lower end of the said outer cylinder, and has a lower nozzle main body part and an upper atomizing gas introduction part, An aerosol confluence space portion to be formed in a center portion of the nozzle body portion and the atomizing gas introduction portion, and one or a plurality of spray holes leading to the aerosol confluence space portion are formed in the nozzle body portion, and the atomization gas flow path And an air atomizing nozzle having a configuration in which one or a plurality of grooves communicating with the air confluence space portion are formed in the gas inlet for atomization. The liquid fuel tank is provided on the atomizing gas inlet, and the liquid fuel flowing out of the liquid fuel outlet hole and flowing into the air confluence space portion flows downward through the atomizing gas flow path. The atomization gas introduced into the air confluence space by flowing the groove in the gas introduction portion, and after joining in the air confluence space portion, characterized in that the configuration is sprayed from the spray hole together with the gas for atomization. .

In addition, in the air atomizing burner of the second configuration, in the air atomizing burner of the second configuration, the bottom surface of the liquid fuel tank is provided with a tapered tapered surface portion, and the upper surface of the atomizing gas introduction portion A tapered tapered surface portion is formed, and the liquid fuel tank is provided on the vaporized gas introduction portion in a state where the tapered surface portion of the liquid fuel tank is brought into contact with the tapered surface portion of the gas introduction portion for atomization. It is characterized by that.

Further, in the air atomizing burner of the fourth configuration, in the air atomizing burner of the first configuration, the liquid fuel outlet hole is opened to the bottom of the liquid fuel tank, and the side of the liquid fuel tank and the side of the side are A cylindrical atomizing gas flow path formed between the outer cylinder surrounding the periphery, and an air confluence space portion provided at the lower end of the outer cylinder and positioned below the liquid fuel outlet hole, is formed in the central portion, and further, A two-fluid atomizing nozzle having a configuration in which one or a plurality of spray holes are connected to the confluence space is provided, and a tapered tapered surface is formed on the bottom of the bottom of the liquid fuel tank, and the upper surface of the two-fluid atomizing nozzle is also provided. A tapered surface portion is formed, and in the liquid fuel tank, the tapered surface portion of the liquid fuel tank is the air atomizing nozzle. One or a plurality of grooves provided on the air atomizing nozzle in contact with the tapered surface part so as to be in contact with each other, and communicating with the gas flow path for atomization and the air confluence space portion to the bottom of the liquid fuel tank. And a liquid fuel flowing out of the liquid fuel outlet hole and flowing into the air confluence space portion flows downward through the atomizing gas flow path and flows through the groove at the bottom of the liquid fuel tank to join the air confluence. After the confluence of the atomization gas introduced into the space and the two-fluid confluence space, the atomization gas is sprayed together with the atomization gas from the spray hole.

Moreover, the air atomizing burner of a 5th structure is the air atomizing burner of any one of 2nd-4th structure WHEREIN: The said airflow confluence space part is circular in plan view from the upper surface, and the groove | channel of the said gas introduction part for atomization is Alternatively, the groove of the bottom of the liquid fuel tank may be formed to follow the tangential direction of the circumference of the air confluence space portion when viewed from the top.

Moreover, the two-fluid atomizing burner of a 6th structure is a double-fluid atomizing burner of any one of 2nd-4th structure WHEREIN: The said airflow confluence space part is circular in shape from an upper surface, and the groove | channel of the said gas introduction part for atomization is Alternatively, the groove of the bottom of the liquid fuel tank is formed so as to follow the radial direction of the air confluence space portion when viewed from the top.

In addition, in the double-fluid spray burner of the seventh configuration, in the double-fluid spray burner of the fifth or sixth configuration, the groove of the gas inlet for atomization or the groove of the bottom of the liquid fuel tank is the center of the confluence of the air confluence. A plurality is formed so that it may become a positional relationship of rotational symmetry about an axis.

Moreover, the air atomizing burner of an 8th structure is a liquid atomizing burner of any one of 2nd-7th structure WHEREIN: By providing the pressurizing member which presses the said liquid fuel tank downward, the said liquid fuel The bottom part of the tank was pressurized to be in close contact with the atomizing air inlet of the air atomizing nozzle, or the bottom part of the liquid fuel tank was pressurized to the air atomizing nozzle.

Moreover, in the air atomizing burner of a 9th structure, in the air atomizing burner of a 1st structure, the said liquid fuel outflow hole is opened to the bottom part of the said liquid fuel tank, and the side part of this liquid fuel tank and this side part A cylindrical first gas passage for atomization formed between the outer cylinder surrounding the periphery, and an air confluence space portion provided at the lower end of the outer cylinder and located below the liquid fuel outlet hole, A two-fluid atomizing nozzle having a configuration in which one or a plurality of spray holes leading to the two-fluid conjoining space portion is provided, and a tapered tapered surface portion is formed on an upper surface of the dual-fluid atomizing nozzle, and a lower surface of the bottom of the liquid fuel tank is provided. A tapered tapered surface portion is also formed on the side, and a plurality of support portions are provided on the side of the liquid fuel tank, and the lower surface of these support portions is further provided. A tapered surface portion is also formed, and the liquid fuel tank is provided on the double-fluid spray nozzle in a state in which the tapered surface portion of the support portion is fitted into the tapered surface portion of the double-fluid atomizing nozzle and is in contact with each other. The gap secured between the tapered surface portion of the liquid fuel tank and the tapered surface portion of the air atomizing nozzle is used as the second atomizing gas flow path, and the liquid flows out of the liquid fuel outlet hole and flows into the air confluence space portion. After the fuel flows down the said 1st atomization gas flow path downward, it passes through the atomization gas distribution part between the said support parts, flows through the said 2nd atomization gas flow path, and the atomization gas introduced into the said air confluence space part, The said After joining in the confluence space of the two-fluid, in a configuration sprayed from the spray hole with the atomizing gas It is characterized by one.

The air atomizing burner of the tenth configuration is the air atomizing burner of any one of the second to ninth configurations, wherein the air confluence space portion has an inverted cone shape and is located at the apex position of the space portion of the inverted cone shape. The said spray hole is formed, It is characterized by the above-mentioned.

In the dual-fluid atomizing burner of the eleventh configuration, in the dual-fluid atomizing burner according to any one of the first to tenth configurations, the distal end portion of the liquid fuel supply pipe is in contact with the inner peripheral surface of the side of the liquid fuel tank. It is done.

(Effects of the Invention)

According to the burner of 1st invention, the combustion air which flowed below the said combustion air flow path is separated from the said fuel injection nozzle by being interrupted by the said shielding board, and led to the outer peripheral side of the said shielding board, and the said combustion By having a configuration that flows into the combustion space portion through the air distribution hole, only a part of the combustion air is mixed with the fuel injected from the fuel injection nozzle and used for combustion of the fuel in the combustion space portion. The remainder of flows further downwards and mixes with the combustion exhaust gases generated by the combustion. For this reason, by the one-time (one step) supply of combustion air, proper mixing of combustion air and fuel can be achieved, and a large amount of combustion exhaust gas can be generated without excessively cooling a flame. Therefore, it is possible to realize a burner such as a two-fluid spray burner that can generate a large amount of combustion exhaust gas with a simple configuration, and that there is no fear of generating unburned gas or misfire.

Furthermore, since the shielding air is introduced into the combustion space portion at a position away from the fuel injection nozzle, the position at which 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, whereby soot can be prevented from adhering to the lower surface of the shielding plate. If the amount of soot adhered to the lower surface of the shielding plate increases, there is a possibility that defects such as clogging of the fuel injection nozzle due to soot and abnormal heating of the fuel injector due to the soot absorbing the radiant heat of the flame may occur. Likewise, by preventing soot from adhering to the lower surface of the shielding plate, occurrence of such a defect can be prevented in advance.

According to the burner of 2nd invention, the cylinder for combustion air supply retardation extended downward from the lower surface of the said shielding board is provided, and the other cylindrical combustion which passes through this burner outer cylinder to the said combustion air distribution hole By forming the air flow path for combustion, and the combustion air which passed the said combustion air flow hole flows below the said other combustion air flow path, it is set as the structure which flows into the said combustion space part from the lower end of the said other combustion air flow path. It is possible to delay the supply of a part of the combustion air to the fuel injected from the fuel injection nozzle. That is, the position where a part of combustion air is supplied to the fuel can be farther away from the shield plate. Therefore, the position of the flame also moves away from the shielding plate, whereby soot can be prevented from adhering to the lower surface of the shielding plate. In addition, although the effect of disengaging the position where a part of this combustion air is supplied to the fuel downward from the shielding plate is obtained only by providing the shielding plate as described above, the air supply for combustion is provided as in the second invention. By providing the delay barrel, the position at which a part of the combustion air is supplied to the fuel can be reliably separated from the shield plate downward.

In the first aspect of the present invention, when the shielding plate cannot be made too large and the distance from the fuel injection nozzle to the combustion air distribution hole cannot be sufficiently obtained due to the limitation of the size of the burner, the combustion supplied to the fuel. There is a fear that the amount of part of the air is excessively large and the flame is excessively cooled. On the other hand, as in the second invention, providing a cylinder for delaying the supply of combustion air can not only keep the position at which a part of the combustion air is supplied to the fuel downward from the shielding plate, but also supply the fuel at this time. It is also possible to reduce the amount of part of the combustion air to be an appropriate amount. Therefore, also from this viewpoint, it is effective to provide a cylinder like this 2nd invention. By providing a cylinder, a shield plate can be made small and a burner can be miniaturized.

According to the burner of the third aspect of the invention, one or more stagnation prevention cylinders extending downward from the lower surface of the shielding plate are provided inside the cylinder for delaying the supply of air for combustion, so that the fuel is stored near the lower surface of the shielding plate. The formation of stagnation (convection) can be prevented by a stagnation prevention cylinder. For this reason, it is possible to ignite the fuel stagnating near the lower surface of the shield plate and to prevent soot from adhering to the lower surface of the shield plate.

According to the burner of 4th invention, in the said shielding plate, the some combustion air distribution hole is formed in the said shielding plate in the inside of the said combustion air distribution hole, and a part of these combustion air distribution holes are also made. Since it passes, it is possible to suppress the generation of stagnant air of combustion air in the vicinity of the lower surface of the shielding plate due to the flow of the combustion air, so that the soot can adhere to the lower surface of the shielding plate. In addition, since low-temperature combustion air flows in the vicinity of the fuel injection nozzle through the other combustion air distribution hole, the effect of cooling the fuel injection nozzle which is easily overheated by radiant heat of the flame by this combustion air is also obtained. Can be.

According to the burner of 5th invention, the said fuel injector injects liquid fuel from the said fuel injection nozzle, and forms the cylindrical gas fuel flow path between the gaseous fuel supply line surrounding the said fuel injector, and the said fuel injector. The gaseous fuel flows downward through the gaseous fuel flow passage, and is configured to be injected and combusted from the lower end of the gaseous fuel flow passage so that the gaseous fuel injected from the cylindrical gaseous fuel passage flows in the circumferential direction. Since it becomes uniform, combustibility improves, for example, when the supply amount of liquid fuel is small, the flame protection effect by gaseous fuel is exhibited.

According to the burner of 6th invention, the throttle plate which opened the distribution hole in the center part is provided in the said combustion space part, and the combustion air which flowed into the said combustion space part below to the center part of the said combustion space part by the said throttle plate. It is characterized in that it is configured to pass the flow passage hole of the throttle plate, so that mixing of combustion air and unburned gas is promoted. As a result, since combustion of unburned gas is accelerated | stimulated, a fuel can be burned completely and a flame can also be made flame-proof. Moreover, since a fluid such as combustion air is throttled once in the flow hole of the throttle plate, the flow rate distribution of the fluid is uniform in the circumferential direction. For this reason, a furnace etc. can also be heated uniformly in a circumferential direction by combustion exhaust gas.

According to the burner of 7th invention, the turning spring is provided in the upper side of the said throttle board, and the flow of the combustion air which passes through the flow hole of the said throttle board is made into the turning flow by the said turning spring, It is characterized by the above-mentioned. Therefore, the combustion air that has passed through the flow hole of the throttle plate is spread in the horizontal direction by turning. As a result, since the pressure of the center part of the flow of combustion air falls below the flow hole, the circulation flow of the air for combustion which flows in from the outer side to the said center part arises. Therefore, since the mixing of the combustion air and the unburned gas is further promoted, and the combustion of the unburned gas is further promoted, the fuel is more likely to burn more completely, and the flame is further reduced.

According to the burner of 8th invention, the porous plate which the flow hole opened to the center part is provided in the said combustion space part from the upper side of the throttle plate, and a part of combustion air which flowed into the said combustion space part below by the said porous plate. It is characterized in that it is configured to lead to the central portion of the combustion space portion and pass the flow hole of the porous plate, so that mixing of combustion air and unburned gas is further promoted, and combustion of unburned gas is further promoted. Therefore, the fuel is more likely to burn more completely, and the flame is further monolithic.

Moreover, according to the two-fluid atomizing burner of a 1st structure, it has a cylindrical side part and the bottom part provided in the lower end of this side part, and stores the liquid fuel supplied from the liquid fuel supply pipe, and below the liquid level of this stored liquid fuel. A liquid fuel tank positioned to discharge the stored liquid fuel from one or a plurality of liquid fuel outlet holes which are opened to the side or the bottom, wherein the liquid flows out of the liquid fuel outlet holes of the liquid fuel tank; The fuel stored in the liquid fuel tank from the liquid fuel outflow hole of the liquid fuel tank even when the liquid fuel is intermittently supplied from the liquid fuel supply pipe to the liquid fuel tank by making the fuel atomize and burn the fuel with the atomizing gas. Fuel will flow out continuously. That is, even when the supply flow rate of the pump of the liquid fuel supply system decreases, and the liquid fuel is intermittently supplied from the liquid fuel supply pipe to the liquid fuel tank, the liquid level of the liquid fuel stored in the liquid fuel tank fluctuates up and down slightly, thereby the liquid fuel. The outflow flow rate of the liquid fuel from the outflow hole is a little fluctuation | variation, and it does not become the fluctuation | variation of the large liquid fuel supply flow volume like the conventional one. For this reason, even when the liquid fuel supply flow rate is low, stable supply of the liquid fuel becomes possible, and it becomes easy to establish stable combustion, and there is no fear of causing unburned exhaust gas or fire.

According to the two-fluid atomizing burner, the liquid fuel flowing out from the liquid fuel outlet hole and flowing into the two-fluid confluence space portion flows downward through the atomizing gas flow path, and then the grooves are opened in the atomizing gas introduction section. The liquid fuel flows from the spray hole together with the atomizing gas that flows into the air confluence space portion and joins in the air confluence space portion, and is then sprayed from the spray hole together with the gas for atomization. The atomizing gas (increased in the horizontal velocity component) is mixed well in the air confluence space portion, and then sprayed from the spray hole of the air atomizing nozzle. For this reason, compared with the case where no air confluence space part or groove is provided, the spread angle of the spray of liquid fuel becomes large, and since a liquid fuel is reliably atomized, the combustibility of this liquid fuel improves.

According to the two-fluid atomizing burner of the third configuration, the liquid fuel tank is placed on the atomizing gas introduction portion in a state in which the tapered surface portion of the liquid fuel tank is inserted into contact with the tapered surface portion of the gas introduction portion for atomization. Since it is provided, it is easy to match the center axis of a liquid fuel tank and an air atomizing nozzle. Therefore, since the width of the atomization gas flow path can be made uniform in the circumferential direction without the bias of the liquid fuel tank, the flow of the atomization gas in the atomization gas flow path can be made uniform in the circumferential direction. The symmetry of the spraying of the liquid fuel from the spray hole of the nozzle (i.e., the symmetry of the flame) can be ensured.

According to the two-fluid atomizing burner of the fourth configuration, the liquid fuel flowing out of the liquid fuel outflow hole and introduced into the two-fluid confluence space portion flows downward through the atomizing gas flow path, and then, at the bottom of the liquid fuel tank, The liquid fuel flows in the grooves by flowing a groove into the atomizing gas introduced into the air confluence space portion, and joining in the air confluence space portion, and then sprayed together with the atomizing gas from the spray hole. The atomizing gas is rapidly mixed (increased in the horizontal velocity component) and mixed in the air confluence space, and sprayed from the spray hole. For this reason, compared with the case where an airflow confluence space part and a groove | channel are not provided, the spreading angle of the spray of liquid fuel becomes large, and since a liquid fuel is reliably atomized, the combustibility of a liquid fuel improves.

Further, since the liquid fuel tank is provided on the air atomizing nozzle in a state where the tapered surface part of the liquid fuel tank is in contact with the tapered surface part of the air atomizing nozzle, the liquid fuel tank is connected to the liquid fuel tank. It is easy to align the center axis of the two-fluid atomizing nozzle. Therefore, since the width of the atomization gas flow path can be made uniform in the circumferential direction without the bias of the liquid fuel tank, the flow of the atomization gas in the atomization gas flow path can be made uniform in the circumferential direction. The symmetry of the spraying of the liquid fuel from the spray hole of the nozzle (i.e., the symmetry of the flame) can be ensured.

According to the dual-fluid atomizing burner of the fifth configuration, the groove of the gas introduction section for atomization or the groove of the bottom section of the liquid fuel tank is formed so as to follow the tangential direction of the circumference of the air confluence space section from the upper surface. In the two-fluid confluence space portion, the atomizing gas is swirled and mixed with the liquid fuel, whereby 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 atomizing nozzle can be atomized more reliably, and the combustibility of the liquid fuel can be further improved.

According to the dual-fluid atomizing burner of the sixth configuration, the grooves of the gas introduction section for atomization or the grooves of the bottom section of the liquid fuel tank are formed so as to follow the radial direction of the two-fluid confluence space section when viewed from the top. In the confluence space portion, 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 atomizing nozzle can be atomized more reliably, and the combustibility of the liquid fuel can be further improved.

According to the two-fluid atomizing burner of the seventh structure, a plurality of grooves of the gas inlet for atomization or a bottom of the liquid fuel tank are formed in plural so as to have a rotational symmetry position relationship around a central axis of the two-fluid confluence space part. The distribution amount of the circumferential direction of the liquid fuel sprayed from the spray hole of the two-fluid atomizing nozzle can be made uniform, and the combustibility of the liquid fuel can be improved.

According to the two-fluid atomizing burner of 8th structure, by providing the pressurizing member which presses the said liquid fuel tank downwards, the bottom part of the said liquid fuel tank was pressed against the air introduction part for atomization of the said dual-fluid atomizing nozzle, and was made to adhere. The lower surface of the fuel tank is in close contact with the upper surface of the atomization gas inlet, or the fuel is in contact with the bottom surface of the liquid fuel tank. The tapered surface portion of the bottom portion of the tank and the tapered surface portion of the atomizing gas introduction portion are brought into close contact, or the tapered surface portion of the liquid fuel tank and the tapered surface portion of the air atomizing nozzle can be brought into close contact with each other to prevent a gap between these contact surfaces. have. For this reason, the gas for atomization is prevented from flowing in parts other than a groove | channel, and the effect of wide area spraying by a groove | channel can fully be exhibited.

According to the two-fluid atomizing burner of the ninth structure, the liquid fuel flowing out of the liquid fuel outlet hole and flowing into the two-fluid confluence space portion flows downwardly through the first atomizing gas flow path and is used for atomizing gas between the supporting portions. After passing through the distribution section, the atomizing gas introduced into the air confluence space by flowing through the second atomizing gas flow path is joined to the air confluence space, and then sprayed from the spray hole together with the gas for atomization. With the configuration, the liquid fuel is mixed with the atomizing gas in the air confluence space portion, and then sprayed from the spray hole of the air atomizing nozzle. For this reason, compared with the case where no air confluence space part is provided, the spreading angle of the spray of liquid fuel becomes large, and since a liquid fuel is reliably atomized, the combustibility of this liquid fuel improves.

According to the two-fluid atomizing burner of the tenth aspect, the two-fluid confluence space portion has a reverse conical shape, and since the spray hole is formed at the apex position of the inverse conical space portion, the liquid fuel in the two-fluid confluence space portion. And the atomizing gas can be mixed more reliably. For this reason, the liquid fuel sprayed from a spray hole can be atomized more reliably, and the combustibility of a liquid fuel can be improved further.

According to the double-fluid atomizing burner of the 11th structure, since the front-end | tip part of the said liquid fuel supply pipe | tube is in contact with the inner peripheral surface of the side part of the said liquid fuel tank, even when the outflow amount of the liquid fuel from a liquid fuel supply pipe | tube is small, a liquid fuel may make the said inner peripheral surface into a small amount. Since it flows along, the outflow of liquid fuel from a liquid fuel outflow hole can be stabilized more. In other words, when the liquid fuel becomes granular and falls, the liquid level of the liquid fuel stored in the liquid fuel tank is greatly changed, and when the liquid level is very low, the liquid fuel outflow hole is temporarily exposed and the liquid fuel outflow is stopped. However, if the liquid fuel flows down along the inner circumferential surface of the liquid fuel tank, the occurrence of such a defect can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the structure of the air atomizing burner which concerns on Embodiment 1 of this invention.

2 is a cross-sectional view seen from the arrow direction of the line A-A of FIG.

3 is a cross-sectional view seen from the arrow direction of the B-B line of FIG.

4 (a) is an enlarged vertical sectional view showing an air atomizer provided in the air atomizer burner of FIG. 1, and (b) is a cross sectional view seen from the arrow direction of the C-C line in (a),

(A) is a longitudinal cross-sectional view which expands and shows the lower part of the said air atomizer, (b) is a plan view which extracts and shows the air atomizing nozzle with which the said air atomizer was equipped [D direction of (a)] View from

Fig. 6 (a) is a longitudinal sectional view showing the configuration of the lower part of the air atomizer in the air atomizing burner according to the second embodiment of the present invention, and (b) is the air atomizing unit provided in the air atomizing atomizer. A plan view (extracted from the E direction of (a) in the nozzle extracted), and

(A) is a longitudinal cross-sectional view which shows the structure of the lower part of the air atomizer in the air atomizing burner which concerns on Embodiment 3 of this invention, (b) is the air atomizing body equipped with the said air atomizer. A plan view (a view seen from the F direction of (a)] which extracts and shows a nozzle,

Fig. 8 (a) is a longitudinal sectional view showing the configuration of the lower part of the dual-fluid atomizer in the dual-fluid atomizing burner according to Embodiment 4 of the present invention (a longitudinal cross-sectional view as seen from the arrow direction of the GG line in (b)), (b) is a bottom view (shown from the H direction of (a)] and (c) is a view seen from the I direction of (b), (d) Is a cross-sectional view as seen from the arrow direction of the JJ line in (a),

9 (a) is a longitudinal sectional view showing the configuration of the lower part of the air atomizer in the air atomizing burner according to the fifth embodiment of the present invention [sectional view seen from the arrow direction of the KK line in (b)], ( b) is a bottom view (shown from the L direction of (a)] which shows and extracts the liquid fuel tank provided in the said air atomizer, (c) is a cross sectional view seen from the arrow direction of the MM line of (a),

Fig. 10 (a) is a longitudinal sectional view showing a configuration of a lower portion of an air atomizer in an air atomizing burner according to Embodiment 6 of the present invention, and (b) is viewed from the arrow direction of the NN line in (a). Cross Section,

11 is a longitudinal sectional view showing a configuration of an air atomizing burner according to Embodiment 7 of the present invention;

12 is a cross-sectional view seen from the arrow direction of the O-O line in FIG.

FIG. 13 (a) is a view showing the flow of liquid fuel intermittently from the distal end portion of a liquid fuel supply pipe in a conventional two-fluid atomizing burner, and (b) is a flow rate of supplying liquid fuel in a conventional two-fluid atomizing burner Drawing showing this greatly varying shape,

(A) is a longitudinal cross-sectional view which shows the structure of the air atomizing burner which concerns on Embodiment 8 of this invention, (b) is a cross section seen from the arrow direction of the P-P line of (a),

FIG. 15 is a view showing the relationship between the distance L from the spray hole of the air atomizer to the throttle plate, the ratio L / D of the diameter D of the combustion space portion, and the optimum installation position of the throttle plate;

(A) is a longitudinal cross-sectional view which shows the structure of the air atomizing burner concerning Embodiment 9 of this invention, (b) is a cross sectional view seen from the arrow direction of the QQ line of (a), (c) is (b) A diagram showing another structural example of the revolving spring as a cross sectional view corresponding to

FIG. 17 (a) is a longitudinal sectional view showing the configuration of an air atomizing burner according to Embodiment Example 10 of the present invention, and FIG. 17 (b) is a cross sectional view seen from the arrow direction of the R-R line in FIG. 17 (a),

18 is a system diagram showing an outline of a fuel cell power generation system according to Example 11 of the present invention.

(Explanation of the sign)

DESCRIPTION OF SYMBOLS 11 Air atomizing burner, 12 air atomizing atomizer, 13 combustion space part, 14 gas fuel flow path, 15 combustion air flow path, 16 first cylinder, 17 second cylinder, 18 plate, 19 Liquid fuel tank, 20: side, 20a: inner circumferential surface, 20b: outer circumferential surface, 21: bottom, 21a: inner surface (upper surface), 21b: outer surface (lower surface), 21b-1: outer portion, 21b-2: inner portion, 22 : Liquid fuel outflow hole, 23: liquid level, 24: liquid fuel, 24A: external part, 25: liquid fuel supply pipe, 25A: front end (lower end), 26: washer, 27: atomizer outer cylinder, 27A: lower part, 27B: upper part, 28: atomization air flow path, 29: air inlet hole, 30: atomization air supply pipe, 30A: tip part, 31: cap, 32, 33: screw part, 31A: lower part, 31B: step part, 34: O-ring, 35: Washer, 36: coil spring, 37: atomizing gas introduction portion, 37a: upper surface, 37b: inner peripheral surface, 38: air atomizing nozzle, 38a: inner surface (upper surface), 39: nozzle body portion, 40: groove, 41: space portion , 42: space part (concave part), 43: tooth The flow confluence space part, 44: spray hole, 45: gap, 46: atomization air, 47: gaseous fuel supply pipe, 48: burner outer cylinder, 48a: inner peripheral surface, 49: gaseous fuel, 50: combustion air, 51: projection, 52: combustion air flow hole, 53: combustion air passage, 54: spark plug, 61: groove, 81: groove, 91: support portion, 91a: bottom surface, 91a-1: outer portion, 92: atomization air passage, 93: atomization air distribution part, 101: combustion air distribution hole, 111: reformer, 112: combustion furnace, 113: fuel cell, 121: throttle plate, 122: distribution hole, 123: flame, 124: swing spring, 125 : Perforated plate, 126: hole, 127: distribution hole

EMBODIMENT OF THE INVENTION Hereinafter, embodiment example of this invention is described in detail based on drawing.

<Example 1>

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the structure of the air atomizing burner which concerns on Example 1 of this invention, FIG. 2 is a cross sectional view seen from the arrow direction of the AA line of FIG. 1, FIG. Cross section view. 4 (a) is an enlarged longitudinal sectional view showing the air atomizer provided in the air atomizing burner of FIG. 1, and FIG. 4 (b) is a cross sectional view seen from the arrow direction of the line CC in FIG. 4 (a), Fig. 5 (a) is a longitudinal cross-sectional view showing an enlarged lower part of the air atomizer, and Fig. 5 (b) is a plan view showing the air atomizing nozzle provided in the air atomizer and showing it (Fig. 5 (a)). Is a view from the D direction.

Based on FIG. 1, FIG. 2, and FIG. 3, when the outline | summary of the airflow spray burner 11 of this Embodiment Example 1 is demonstrated, this airflow spray burner 11 has the burner outer cylinder 48, and In the burner outer cylinder 48, the air atomizer 12 is arrange | positioned at the center part of the upper side, and the combustion chamber part 13 is the lower side of this air atomizer 12. As shown in FIG. A gaseous fuel supply passage 14 is formed around the double-fluid atomizer 12, and a combustion air supply passage 15 is formed around the gaseous fuel supply passage 14. In addition, the combustion air supply path 15 and the combustion space 13 are partitioned by a plate 18 as a shielding plate, and a lower surface of the plate 18 is formed as a cylinder for delayed combustion air supply. The 1 cylinder 16 and the 2nd cylinder 17 as a cylinder for stagnation prevention are provided.

Based on FIG. 4 and FIG. 5, the structure of the air atomizer 12 is explained in full detail. In addition, the two-fluid atomizer 12 injects a two-fluid of a liquid fuel and an atomizing gas (atomization air), that is, atomizes and injects the liquid fuel into the atomizing gas.

As shown in FIG.4 and FIG.5, the liquid atomizer 12 has the liquid fuel tank 19 built in. 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. And the liquid fuel 24 for burner combustion is stored in the liquid fuel tank 19, and the fine liquid fuel outflow hole 22 is opened in the center part of the bottom part 21 of the liquid fuel tank 19. It is. 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 once stored in the liquid fuel tank 19, and the stored liquid fuel 24 is stored in the liquid fuel tank 22 from the lower liquid fuel outlet hole 22. It is supposed to flow out of 19. At this time, the height of the liquid surface 23 (the height from the inner surface 21a of the bottom portion 21 to the liquid surface 23 of the bottom portion 21) of the liquid fuel 24 stored in the liquid fuel tank 19 is the liquid fuel 24. It becomes the height from which the liquid column head (it mentions later in detail) corresponding to the pressure loss at the time of circulating the liquid fuel outflow hole 22 is obtained. As the liquid fuel 24 for burner combustion, kerosene, heavy oil, alcohol, ether, etc. can be used, for example.

The liquid fuel supply pipe 25 has its front end (lower end) 25A inserted into the liquid fuel tank 19 from the upper end of the liquid fuel tank 19 downward, and has a liquid level in the liquid fuel tank 19. It is arranged so as to be located above the center and also in the center part. The proximal end of the liquid fuel supply pipe 25 is connected to a liquid fuel supply pump of a liquid fuel supply system (not shown).

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

The liquid fuel tank 19 is provided concentrically with the atomizer outer cylinder 27 in the cylindrical atomizer outer cylinder 27, and the cylindrical space between the side part 20 and the atomizer outer cylinder 27 of the liquid fuel tank 19 The atomization air flow path 28 is used as the atomization gas flow path. An air inflow hole 29 is opened in the atomizer outer cylinder 27, and a tip portion 30A of the atomizing air supply pipe 30 is connected to the air inflow hole 29. The base end side of the atomizing air supply pipe 30 is connected to the air supply blower of the atomization air supply system which is not shown in figure.

The double-fluid atomizing nozzle 38 is attached to the lower end portion 27A of the atomizer outer cylinder 27 and is located below the liquid fuel tank 19. That is, the air atomizer 12 has a configuration in which the liquid fuel tank 19 is interposed between the liquid fuel supply pipe 25 and the air atomizing nozzle 38 as a buffer portion for alleviating the variation in the liquid fuel supply flow rate. have. The two-fluid atomizing nozzle 38 has a disk-shaped nozzle main body 39 and an atomizing air inlet 37 serving as an atomizing gas inlet formed on the nozzle main body 39. Fixing means, such as welding, in the state which contacted the peripheral part of the upper surface of 39 with the lower end surface of the nebulizer outer cylinder 27, and fitted the atomizing air introduction part 37 with the inner side of the lower end 27A of the nebulizer outer cylinder 27. It fixes to the lower end part 27A of the nebulizer outer cylinder 27 by this.

The atomization air introduction part 37 is formed in an annular shape, and has the circular space part 41 of circular shape in the center part in plan view (upper surface). The nozzle main body part 39 is provided with an inverted conical space portion (concave portion) 42 at the center thereof, and a fine spray hole 44 at the center (vertical position of the inverted conical space portion 42). Is open. The space part 41 of the atomizing air introduction part 37 and the space part 42 of the nozzle main body part 39 are continuous, and these space parts 41 and 42 comprise the airflow confluence space part 43. Doing. That is, the two-fluid confluence space part 43 is circular in shape as seen from the upper surface, and has a taper structure which becomes small gradually as the diameter goes to the spray hole 44. As shown in FIG. In the atomizing air introduction portion 37, grooves (slits) 40 are formed in two places in the circumferential direction thereof. These grooves 40 are of a pivot type and are viewed along the tangential direction of the circumferential confluence space portion 43 from the top, and also the central axis of the fusion confluence space portion 43 (spray hole in the illustrated example). 44) has a rotational symmetry (equal interval in the circumferential direction) around the central axis.

On the other hand, the upper end part 27B of the nebulizer outer cylinder 27 is closed by the cap 31 as a blocking member for preventing the atomization air to leak from the inside of the nebulizer outer cylinder 27 to the outside. The cap 31 is screwed to the screw portion 32 formed on the inner circumferential surface of the upper end portion 27B of the sprayer outer cylinder 27 by screwing the screw portion 33 formed on the outer circumferential surface of the lower portion 31A to the upper end of the sprayer outer cylinder 27. It is attached to 27B. An O-ring 34 is interposed between the step portion 31B of the cap 31 and the upper end portion 27B of the atomizer outer cylinder 27 to reliably prevent leakage of atomizing air. The tip portion 25A of the liquid fuel supply pipe 25 penetrates the cap 31 and passes through the atomizer outer cylinder 27 (inside the coil spring 36) from the top of the liquid fuel tank 19. 19) is inserted into.

A coil spring 36 as a pressing member is interposed between the washer 35 provided on the lower surface side of the cap 31 and the washer 26 provided on the upper end side of the liquid fuel tank 19. By pressurizing the liquid fuel tank 19 downward by this coil spring 36, the outer surface (lower surface) 21b of the bottom part 21 of the liquid fuel tank 19 is made into the upper surface of the atomizing air introduction part 37. Pressurized to 37a. Thereby, the outer surface (lower surface) 21b of the bottom part 21 which contact | connects mutually, and the upper surface 37a of the air atomizing nozzle 38 (the atomization air introduction part 37) contact | adherently, and these contact surfaces 21b. , 37a) is prevented from occurring.

The clearance 45 is provided between the washer 26 and the liquid fuel supply pipe 25, and is formed in the internal space of the liquid fuel tank 19 and the outside of the liquid fuel tank 19 via the clearance 45. The internal space of the nebulizer outer cylinder 27 communicates. That is, the upper end of the liquid fuel tank 19 is opened with respect to the inner space of the atomizer outer cylinder 27, and the inner space of the liquid fuel tank 19 and the upper end (upstream) of the atomizing air flow path 28 communicate with each other. have. For this reason, the liquid fuel which the pressure of the atomizing air 46 which flows into the atomizer outer cylinder 27 from the air inflow hole 29, and flows into the atomizing air flow path 28 is stored in the liquid fuel tank 19. It also acts on the liquid surface 23 at (24).

In this air atomizer 12, when the liquid fuel 24 for burner combustion transferred from the liquid fuel supply pump via the liquid fuel supply pipe 25 flows out from the tip portion 25A of the liquid fuel supply pipe 25 [ In the case of a relatively high flow rate, it flows out continuously, and in the case of a relatively low flow rate, when it flows out intermittently as shown to FIG. 5 (a)], it is stored in the liquid fuel tank 19 once. Then, the liquid fuel 24 stored in the liquid fuel tank 19 is continuously from the liquid fuel outlet hole 22 of the bottom portion 21 of the liquid fuel tank 19 to the air confluence space portion 43. Spills. In addition, when the outflow of the liquid fuel from the tip 25A of the liquid fuel supply pipe 25 is intermittent, the liquid surface 23 when the liquid fuel 24 flows out from the tip 25A of the liquid fuel supply pipe 25. This rises, and the liquid surface 23 falls repeatedly until the liquid fuel 24 flows out from the tip portion 25A of the liquid fuel supply pipe 25. The liquid level is somewhat changed in accordance with this liquid level variation. Although the flow rate of the liquid fuel 24 flowing out from the fuel outlet hole 22 also changes, this flow rate change is small compared with the conventional flow rate change.

On the other hand, the atomizing air 46 transferred from the air supply pump via the atomizing air supply pipe 30 flows into the atomizer outer cylinder 27 from the air inlet hole 29, and the liquid fuel tank 19 and the atomizer outer cylinder. The atomizing air flow path 28 between 27 flows downward. Thereafter, the atomizing air 46 is introduced into the air confluence space portion 43 in a state where the flow velocity is increased by flowing the grooves 40 of the atomizing air inlet 37 through the air atomizing nozzle 38. Then, it turns into a swirl flow in this air confluence space part 43, and joins (mixes) with the liquid fuel 24 which flowed out from the liquid fuel outflow hole 22 of the liquid fuel tank 19. As shown in FIG. As a result, the liquid fuel 24 and the atomizing air 46 are mixed well, and the liquid fuel 24 is combined with the atomizing air 46 together with the atomizing air 46 in an atomized state by the atomizing air 46. It sprays from the spray hole 44 of 38 into the combustion space part 13 (flame), and combusts. In addition, the initial ignition to 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. In the liquid column head H, the liquid fuel 24 opens the liquid fuel outflow hole 22. Pressure loss (DELTA) P (hole) at the time of circulation, the kinetic energy E of the liquid fuel 24 which flowed out from the liquid fuel outflow hole 22, and the atomizing air 46 in the groove | channel 40 etc. From the pressure loss (ΔP _air ), can be obtained by the following equation.

Liquid column head (H) = pressure loss (ΔP) (hole) + kinetic energy (E)-pressure loss (ΔP _air )

The kinetic energy E can be obtained from the flow rate v of the liquid fuel 24 and the density ρ of the liquid fuel 24 by the following equation.

Kinetic energy = ρv ^2/2

In addition, the height of the liquid level 23 of the storage liquid fuel 24 in the liquid fuel tank 19 depends on the flow rate of the liquid fuel 24 supplied to the liquid fuel tank 19 via the liquid fuel supply pipe 25. Is changed. In other words, 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 increases, and when the supply flow rate of the liquid fuel 24 is decreased, the liquid level 23 decreases. Therefore, the height of the liquid fuel tank 19 is made height corresponding to the change of the height of the liquid surface 23 according to the adjustment range of the supply flow volume of the predetermined liquid fuel 24. As shown in FIG.

In addition, although the liquid fuel 24 is sprayed conically from the spray hole 44 as illustrated in FIG. 5 (a), the spread (spray angle) of spraying at this time is the cross-sectional area of the groove 40 (i.e., the groove ( Flow rate of the atomizing air 46 at the time of circulating 40), the size of the spray hole 44 (ie, the hole diameter), and the like.

Next, the structure other than the air atomizer 12 is demonstrated. As shown in FIG. 1, FIG. 2, and FIG. 3, the cylindrical gas fuel supply pipe 47 is provided so that the circumference | surroundings of the nebulizer outer cylinder 27 may be enclosed. The gaseous fuel supply pipe 47 is provided concentrically with the atomizer outer cylinder 27, and the cylindrical space between the gaseous fuel supply pipe 47 and the atomizer outer cylinder 27 is the gaseous fuel flow path 14. The gaseous fuel 49 for burner combustion supplied from the gaseous fuel supply system flows downward through the gaseous fuel flow passage 14, and is injected into the combustion space 13 from the lower end of the gaseous fuel flow passage 14 and combusted. The liquid fuel 24 and the gaseous fuel 49 may be burned separately or may be burned at the same time. As the gaseous fuel 49 for burner combustion, for example, methane, ethane, propane, butane, dimethyl ether, hydrogen, or the like can be used, and when the air atomizing burner 11 is used as a heat source of the reformer, The remaining reformed gas which is not used for power generation and returned to the air atomizing burner 11 may be used (see FIG. 13).

The burner outer cylinder 48 is cylindrical and surrounds the gaseous fuel supply pipe 47. The burner outer cylinder 48 and the gaseous fuel supply pipe 47 are provided concentrically, and the cylindrical space between the burner outer cylinder 48 and the gaseous fuel supply pipe 47 is the 1st combustion air flow path 15. . Therefore, the combustion air 50 supplied from the air supply blower of the combustion air supply system flows downward through the combustion air flow path 15.

And the plate 18 is provided between the lower end part of the combustion air flow path 15, ie, the lower end part of the gaseous fuel supply pipe 47, and the lower end part of the burner outer cylinder 48. As shown in FIG. The plate 18 is an annular plate, which divides the combustion air passage 15 and the combustion space 13. In addition, in this case, although the plate 18 is provided in substantially the same height as the air atomizing nozzle 38 in this example, it is not limited to this, For example, even if it provides in the position higher than the air atomizing nozzle 38, for example. good. However, when the position of the plate 18 is made high, it is necessary to make the first cylinder 16 and the second cylinder 17 longer than the illustrated example. The same height as 38) is the least expensive and reasonable.

The inner circumferential surface of the plate 18 is fixed to the outer circumferential surface of the gas fuel supply pipe 47 by a fixing means such as welding, while a plurality of projections 51 are formed on the outer circumferential surface of the plate 18. The tip end surfaces of the protrusions 51 are fixed to the inner circumferential surface of the burner outer cylinder 48 by fixing means such as welding. For this reason, from the gaseous fuel supply pipe 47 to the vicinity of the burner outer cylinder 48, the plate 18 is closed, but on the outer circumferential side of the plate 18, the outer peripheral surface of the plate 18 and the burner outer cylinder are formed by the projections 51. A gap is formed between the inner circumferential surfaces 48a of the 48, and these gaps serve as combustion air flow holes 52. That is, the combustion air flow path 15 and the combustion space part 13 communicate with these combustion air flow holes 52.

Therefore, 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 circumferential side of the plate 18, thereby adhering to the two-fluid atomizing nozzle 38 (spray hole 44). ), Flows through the combustion air flow opening 52 and flows into the combustion space 13.

In addition, an outer first cylinder 16 extending downward and an inner second cylinder 17 extending downward are fixed to a lower surface of the plate 18 by fixing means such as welding. The 1st cylinder 16 is located inward of the combustion air flow hole 52, and is arrange | positioned concentrically with the burner outer cylinder 48. As shown in FIG. The cylindrical space between the burner outer cylinder 48 and the first cylinder 16 serves as the second combustion air flow passage 53.

Therefore, the combustion air 50 which flowed below the 1st combustion air flow path 15 and passed through the combustion air distribution hole 52 also flows downward through the 2nd combustion air flow path 53. And the combustion air 50 flows out from the lower end of the combustion air flow path 53, and spreads to the whole combustion space part 13. As shown in FIG. For this reason, a part (for example, about 30% of the whole) of the combustion air 50 which flowed out from the combustion air flow path 53 is the air atomizer 12 (the air atomizing nozzle 38). The liquid fuel 24 sprayed from is supplied (mixed) at a position away from the plate 18 to be used for combustion of the liquid fuel 24. At this time, the quantity of the combustion air 50 mixed with the liquid fuel 24 is set so that the average of air ratio may be 1.5 or less, for example. And the remainder (for example, about 70% of the whole) of the combustion air 50 which flowed out from the combustion air flow path 53 flows further downward, and mixes with the combustion exhaust gas produced by the said combustion. As a result, a large amount of combustion exhaust gas is generated.

Further, the purpose of providing the first cylinder 16 is to delay the supply of a part of the combustion air 50 to the atomized liquid fuel 24, that is, the atomized liquid fuel at a position away from the plate 18 ( 24, it is possible to prevent the smoke from adhering to the plate 18 by the flame in contact with the plate 18. For this reason, the length of the 1st cylinder 16, ie, the front end position (lower position) of the 1st cylinder 16, is used for combustion in the size of the plate 18 (spray hole 44 of the air atomizing nozzle 38). What is necessary is just to set suitably with respect to the distance to the air flow hole 52].

That is, the combustion air distribution hole 52 sprays only by providing the plate 18 and the combustion air distribution hole 52 of the outer peripheral part of the plate 18 without providing the 1st cylinder 16. Since it is separated from the hole 44, a part of the combustion air 50 which has passed through the combustion air distribution hole 52 is supplied to the atomized liquid fuel 24 at a position away from the plate 18. As the distance from the spray hole 44 to the combustion air distribution hole 52 increases, the position at which a part of the combustion air 50 is supplied to the atomizing liquid fuel 24 is separated from the plate 18. . In addition, the larger the plate 18 is, the longer the distance from the spray hole 44 to the combustion air distribution hole 52 is, the larger the diameter of the air atomizing burner 11 becomes.

On the other hand, when the distance from the spray hole 44 to the combustion air distribution hole 52 is restricted by the restriction of the size of the air atomizing burner 11 or the like, the plate 18 and the combustion air distribution hole 52 are limited. It is not possible to delay the supply of a part of the combustion air 50 to the atomized liquid fuel 24 by simply providing a, and at this time, it is very effective to provide the first cylinder 16 as illustrated. Do. In this case, as the distance from the spray hole 44 to the combustion air distribution hole 52 becomes shorter, the first cylinder 16 may extend downward. However, in order to avoid interference between the first cylinder 16 and the sprayed liquid fuel 24, the front end (lower end) of the first cylinder 16 is outside the outer portion 24A of the sprayed liquid fuel 24 ( Upper side). That is, the front end (lower end) of the 1st cylinder 16 can only extend to the external part 24A of the sprayed liquid fuel 24. As shown in FIG.

Moreover, if the distance from the spray hole 44 to the combustion air distribution hole 52 is shortened, since the installation position of the 1st cylinder 16 also comes close to the spray hole 44, the atomizing liquid fuel from the plate 18 Since the distance to 24 A of external parts of (24) also becomes short, the 1st cylinder 16 cannot be made too long. Therefore, in consideration of these limitations, the distance from the spray hole 44 to the combustion air distribution hole 52 and the length of the first cylinder 16 (including whether the first cylinder 16 is necessary) are also included. You may decide appropriately.

The second cylinder 17 is located inside the first cylinder 16 and is arranged concentrically with the first cylinder 16. In addition, 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 is in contact with the plate 18 and the plate 18 It is to prevent soot from adhering to it. For that purpose, it is better to extend the second cylinder 17 downward as much as possible. However, in order to avoid interference between the second cylinder 17 and the atomizing liquid fuel 24, the tip (lower end) of the second cylinder 17 is the outer side (upper side) of the outer portion 24A of the atomizing liquid fuel 24. Need to be located at). That is, the front end (lower end) of the second cylinder 17 can also extend only to the outline 24A of the atomizing liquid fuel 24.

For example, as shown in FIG. 1, the distance from the spray hole 44 of the two-fluid atomizing nozzle 38 to the 2nd cylinder 17 is L1, and the external part 24A of the sprayed liquid fuel 24 is 24A. When the angle with the horizontal line of the () is θ, the length L2 from the tip (bottom) of the air atomizing nozzle 38 (spray hole 44) to the tip (bottom) of the second cylinder 17 is 0. It is necessary to satisfy <L2≤L1tanθ. Moreover, the length of the whole 2nd cylinder 17 becomes the length which combined L2 from the lower surface of the plate 18 to the front end (lower end) of the air atomizing nozzle 38 (spray hole 44). Moreover, such conditions are the length from the front end (lower end) of the air atomizing nozzle 38 (spray hole 44) to the front end (lower end) of the 1st cylinder 16, or the whole of the 1st cylinder 16. The same applies to the length. The distance from the spray hole 44 of the double-fluid spray nozzle 38 to the second cylinder 16 is, for example, 50 times or more than 60 times or more than the hole diameter (for example, about 1 mm) of the spray hole 44. We make distance.

As described above, according to the dual-fluid atomizing burner 11 of the first embodiment, the cylindrical side portion 20 and the bottom portion 21 provided on the lower end of the side portion 20 have a liquid fuel supply pipe 25. The liquid fuel 24 stored from the liquid fuel outflow hole 22 which is stored below the liquid level of the stored liquid fuel 24 and is opened to the bottom portion 21 while storing the liquid fuel 24 supplied from the reservoir. And a liquid fuel tank 19 configured to allow the liquid to flow out, and the liquid fuel 24 flowed out from the liquid fuel outlet hole 22 of the liquid fuel tank 19 is atomized with atomizing air 46 By setting the structure to combust, even when the liquid fuel 24 is intermittently supplied from the liquid fuel supply pipe 25 to the liquid fuel tank 19, the liquid fuel outflow hole 22 of the liquid fuel tank 19 provides liquid. The liquid fuel stored in the fuel tank 19 is to be continuously discharged . That is, even when the liquid flow rate of the pump of the liquid fuel supply system decreases and the liquid fuel 24 is intermittently supplied from the liquid fuel supply pipe 25 to the liquid fuel tank 19, it is stored in the liquid fuel tank 19. The liquid level 23 of the liquid fuel 24 fluctuates up and down slightly, and the outflow flow volume of the liquid fuel 24 from the liquid fuel outflow hole 22 fluctuates a little, and is large like the conventional one shown in FIG. There is no change in the liquid fuel supply flow rate. For this reason, even when the liquid fuel supply flow rate is low, stable supply of the liquid fuel 24 becomes possible, and it becomes easy to establish stable combustion, and there is no possibility of generating unburned exhaust gas and causing fire.

In addition, according to the dual-fluid atomization burner 11 of the first embodiment, the liquid fuel 24 flowing out of the liquid fuel outflow hole 22 and flowing into the dual-fluid confluence space portion 43 is an atomizing air flow path. After the 28 flows downward, the atomizing air introduced into the air confluence space portion 43 flows through the groove 40 through the air inflow portion 37 for atomization, and then joins in the air confluence space portion 43. The liquid fuel 24 is sprayed with the atomizing air from the spray hole 44, so that the liquid fuel 24 has a high velocity of flow in the groove 40 (increasing the horizontal velocity component) and the atomizing air 46 After mixing well in the air confluence space portion 43, it is ejected from the spray hole 44 of the air atomizing nozzle 38. For this reason, the spread angle of the spray of the liquid fuel 24 becomes large compared with the case where the airflow confluence space part 43 and the groove | channel 40 is not provided, and since the liquid fuel 24 is reliably atomized, a liquid fuel The combustibility of (24) is improved.

Further, according to the dual-fluid atomizing burner 11 of the first embodiment, the groove 40 of the air inlet part 37 for atomization is along the tangential direction of the circumference of the two-fluid confluence space 43. Since the atomization air 46 is swirled and mixed with the liquid fuel 24 in the two-fluid confluence space portion 43, the liquid fuel 24 and the atomizing air 46 are more formed. It mixes well. For this reason, the liquid fuel 24 injected from the spray hole 44 of the two-fluid atomizing nozzle 38 can be atomized more reliably, and the combustibility of the said liquid fuel 24 can be improved more.

Further, according to the dual-fluid atomizing burner 11 of the first embodiment, the groove 40 of the atomizing air inlet 37 has a rotational symmetry positional relationship around the central axis of the dual-fluid confluence space 43. Since it is formed as many as possible, the distribution amount of the circumferential direction of the liquid fuel 24 sprayed from the spray hole 44 of the dual-fluid atomizing nozzle 38 can be made uniform, and the combustibility of the liquid fuel 24 can be improved. have.

In addition, according to the double-fluid spray burner 11 of the first embodiment, the bottom portion of the liquid fuel tank 19 is provided by providing a coil spring 36 for pressing the liquid fuel tank 19 downward. The lower surface 21b of the bottom part 21 of the fuel tank 19 and the atomizing air introduction part 37 are formed by pressing 21 to the atomizing air introduction part 37 of the dual-fluid atomizing nozzle 38 and bringing it into close contact. By making the upper surface 37a of) close to each other, a gap can be prevented from occurring between these contact surfaces 21b and 37a. For this reason, the atomization air 46 can be prevented from flowing to parts other than the groove | channel 40, and the effect of wide area spraying by the groove | channel 40 can fully be exhibited.

In addition, according to the double-fluid spray burner 11 of the first embodiment, the double-fluid confluence space portion 43 has a reverse conical shape, and the spray hole 44 is located at the apex position of the reverse conical space portion 43. Since this is formed, mixing of the liquid fuel 24 and the atomizing air 46 in the two-fluid confluence space part 43 can be performed more reliably. For this reason, the liquid fuel 24 sprayed from the spray hole 44 can be atomized more reliably, and the combustibility of the liquid fuel 24 can be improved further.

In addition, according to the double-fluid atomizing burner 11 of Example 1 of this invention, the cylindrical gas fuel flow path formed between the atomizer outer cylinder 27 and the gaseous fuel supply pipe 47 which surrounds the circumference of the atomizer outer cylinder 27 is carried out. (14), the gaseous fuel (49) flows downward from the lower end of the gaseous fuel flow passage (14), and is configured to be burned and burned from the cylindrical gaseous fuel flow passage (14). Since the injected gaseous fuel 49 becomes uniform in the circumferential direction, combustibility is improved, and when the supply amount of the liquid fuel 24 is small, for example, the flame protection effect by the gaseous fuel 49 is exerted.

In the double-fluid atomizing burner 11 of the first embodiment, the tip 25A of the liquid fuel supply pipe 25 is in contact with the inner circumferential surface 20a of the side 20 of the liquid fuel tank 19. Since the liquid fuel 24 flows along the inner circumferential surface 20a even when the outflow amount of the liquid fuel 24 from the liquid fuel supply pipe 25 is small, the liquid fuel 24 from the liquid fuel outflow hole 22 ) Can be more stabilized. That is, when the liquid fuel 24 becomes granular and falls, the liquid level 23 of the liquid fuel 24 stored in the liquid fuel tank 19 greatly fluctuates, and temporarily when the liquid level 23 is very low. It is also conceivable that the liquid fuel outlet hole 22 is exposed and the outflow of the liquid fuel 24 is stopped, but if the liquid fuel 24 is allowed to flow along the inner circumferential surface 20a of the liquid fuel tank 19, It can prevent occurrence.

Moreover, according to the double-fluid atomizing burner 11 of the example 1 of this embodiment, the combustion air 50 which flowed downward through the combustion air flow path 15 is interrupted | blocked by the plate 18, and the plate 18 of the plate 18 is carried out. The combustion space portion 13 is provided with combustion air in the combustion space 13 by moving away from the double-fluid atomizing nozzle 38 by being guided to the outer circumferential side and flowing into the combustion space 13 through the combustion air distribution hole 52. Only part of the 50 is mixed with the liquid fuel 24 sprayed from the air atomizing nozzle 38 to be used for combustion of the liquid fuel 24, and the remainder of the combustion air 50 flows further downward, It is mixed with combustion exhaust gas generated by the combustion. For this reason, by the one-time (one step) supply of combustion air, proper mixing of the combustion air 50 and the liquid fuel 24 can be achieved, and a large amount of combustion exhaust is performed without excessively cooling a flame. It can generate gas. In other words, a large-sized combustion exhaust gas can be generated with a simple configuration, and a two-fluid spray burner can be realized without the risk of generating unburned gas or misfire.

In addition, since the combustion air 50 is introduced into the combustion space 13 from a position away from the air atomizing nozzle 38 by the plate 18, a part of the combustion air 50 is supplied to the fuel. The position can be farther away from the plate 18. Therefore, the position of the flame also moves away from the plate 18 to prevent soot from adhering to the lower surface of the plate 18. When the amount of soot adhering to the lower surface of the plate 18 becomes large, clogging of the air atomizing nozzle 38 due to soot, abnormal heating of the air atomizer 12 due to soot absorbing the radiant heat of the flame, and the like Although there is a possibility that a defect may occur, the generation of soot can be prevented in advance by preventing soot from adhering to the lower surface of the plate 18 as described above.

Moreover, according to the double-fluid atomizing burner 11 of Example 1 of this invention, the 1st cylinder 16 for the delay of supply of combustion air extended downward from the lower surface of the plate 18 is provided, and this 1st cylinder A combustion air flow path 53 is formed between the 16 and the burner outer cylinder 48 through the combustion air flow holes 52, and the combustion air 50 passes through the combustion air flow holes 52. ) Flows downward through the combustion air flow path 53, so that a part of the combustion air 50 flows into the air atomizing nozzle by flowing into the combustion space 13 from the lower end of the combustion air flow path 53. Supply to the liquid fuel 24 atomized from 38 can be slowed down. That is, the position where a part of the combustion air 50 is supplied to the liquid fuel 24 can be farther away from the plate 18. Therefore, the position of the flame also moves away from the plate 18 to prevent soot from adhering to the lower surface of the plate 18.

In addition, the effect of distant from the plate 18 at a position where a part of the combustion air 50 is supplied to the liquid fuel 24 is obtained only by providing the plate 18 as described above. When the first cylinder 16 for delaying combustion air supply is provided as in the first embodiment, the position where the part of the combustion air 50 is supplied to the liquid fuel 24 is more reliably supplied. 18) can be kept downward.

Further, due to the limitation of the size of the air atomizing burner 11 or the like, the plate 18 cannot be made too large and the distance from the air atomizing nozzle 38 to the combustion air distribution hole 52 cannot be sufficiently taken. In this case, the amount of a part of the combustion air 50 supplied to the liquid fuel 24 increases too much, and the flame may be excessively cooled. On the other hand, if the 1st cylinder 16 for delaying combustion air supply is provided like Example 1 of this embodiment, the plate 18 will show the position where a part of combustion air 50 is supplied to the liquid fuel 24. As shown in FIG. Not only can it be separated from the lower side, but also the amount of a part of the combustion air 50 supplied to the liquid fuel 24 can be reduced to an appropriate amount at this time. Therefore, also from this viewpoint, it is effective to provide the 1st cylinder 16 like Example 1 of this embodiment, and by providing the 1st cylinder 16, the plate 18 is made small and the two-fluid atomizing burner 11 is provided. ) Can also be miniaturized.

In addition, according to the double-fluid atomizing burner 11 of the first embodiment, the second cylinder 17 for stagnation prevention extending downward from the lower surface of the plate 18 is provided with a first cylinder for delaying combustion air supply. By providing the inside of 16, it can prevent that stagnation (convection) of the liquid fuel 24 arises in the vicinity of the lower surface of the plate 18 by the 2nd cylinder 17 for stagnation prevention. For this reason, it is possible to ignite the liquid fuel 24 stagnating near the lower surface of the plate 18 and to prevent soot from adhering to the lower surface of the plate 18.

In addition, according to the double-fluid atomizing burner 11 of the first embodiment, the flame is surrounded by the burner outer cylinder 48, and thus the flame (sprayed liquid fuel 24) in the combustion space 13 is obtained. And the combustion air 50 can be mixed well, and thus the combustibility is improved.

<Example 2>

Fig. 6 (a) is a longitudinal sectional view showing the configuration of the lower part of the air atomizer in the air atomizing burner according to the second embodiment of the present invention, and Fig. 6 (b) is the air stream provided in the air atomizer. It is a top view (drawing seen from the E direction of FIG. 6 (a)) which extracts and shows a sieve spray nozzle.

As shown in FIG. 6, in the two-fluid atomizing nozzle 38 of the two-fluid atomizer 12 in Embodiment 2 of this invention, the groove (slit) is provided in four circumferential directions of the air introduction part 37 for atomization. 61 is formed. These grooves 61 are of a collision type, and along the radial direction of the air confluence space portion 43 which is circular from the top, and also the central axis of the air confluence space portion 43 (spray hole 44 in the illustrated example). The central axis of) is formed to be in a positional relationship (equal interval in the circumferential direction) of rotational symmetry.

In this dual-fluid atomizer 12, the atomizing air 46 which flowed downward through the atomizing air flow path 28 opens the groove 61 of the atomizing air introduction part 37 in the dual-fluid atomizing nozzle 38. As shown in FIG. The liquid fuel is introduced into the air confluence space portion 43 in a state in which the flow velocity is increased by flowing, and flowed out from the liquid fuel outlet hole 22 of the liquid fuel tank 19 in the air confluence space portion 43. To merge with each other (24). As a result, the liquid fuel 24 and the atomizing air 46 are mixed well, and the liquid fuel 24 is combined with the atomizing air 46 together with the atomizing air 46 in the state of being atomized by the atomizing air 46. It is injected into the combustion space part 13 from the spray hole 44 of 38. As shown in FIG.

In addition, the structure of the other part in the air atomizer 12 of FIG. 6 is the same as that of the air atomizer 12 of Example 1 (FIG. 4) of the said embodiment. In addition, also about the structure of parts other than the air atomizer in the air atomizer burner 11 of Example 2 of this embodiment, it is the same as the air atomizer burner 11 of the said Example 1 (FIGS. 1-3). same.

According to the two-fluid atomizing burner 11 of this Embodiment Example 2, the following effect is acquired, and also the other effect similar to the said Embodiment Example 1 can also be obtained.

That is, according to the two-fluid atomizing burner 11 of Example 2 of this invention, the groove 61 of the gas introduction part 37 for atomization is formed so that the radial direction of the two-fluid confluence space part 43 may be seen from an upper surface. As a result, in the two-fluid confluence space portion 43, the atomizing air 46 collides with the liquid fuel 24 and is mixed with the liquid fuel 24. Therefore, the liquid fuel 24 and the atomizing air 46 ) Is mixed more reliably. For this reason, the liquid fuel 24 injected from the spray hole 44 of the two-fluid atomizing nozzle 38 can be atomized more reliably, and the combustibility of the said liquid fuel 24 can be improved more.

Moreover, since the groove 61 of the gas introduction part 37 for atomization is formed in multiple numbers so that it may become rotationally symmetrical position relationship around the central axis of the air confluence space part 43, the spray of the air atomizing nozzle 38 is sprayed. The distribution amount in the circumferential direction of the liquid fuel 24 sprayed from the hole 44 can be made uniform, and the combustibility of the liquid fuel 24 can be improved.

<Example 3>

Fig. 7 (a) is a longitudinal sectional view showing the configuration of the lower part of the air atomizer in the air atomizing burner according to the third embodiment of the present invention, and Fig. 7 (b) is the air stream provided in the air atomizer It is the top view (drawing seen from the F direction of FIG. 7 (a)) which extracts and shows a sieve spray nozzle.

As shown in FIG. 7, in the air atomizer 12 of Example 3 of this embodiment, the inner surface (upper surface) 21a of the bottom part 21 of the liquid fuel tank 19 is tapered (reverse cone shape). And a fine liquid fuel outlet hole 22 is formed in the center (vertical position of the inverted conical taper surface). The outer surface (lower surface) 21b of the bottom portion 21 of the liquid fuel tank 19 has a tapered surface of which the outer portion 21b-1 is tapered (inverted cone), and the inner portion 21b. -2) is a circular horizontal plane.

On the other hand, the atomizing air introduction portion 37 of the two-fluid atomizing nozzle 38 is formed in an annular shape, and the inner circumferential surface 37b is a tapered surface of a tapered shape (reverse cone shape). In the liquid fuel tank 19, the outer portion 21b-1 (tapered surface portion) of the lower surface 21b of the bottom portion 21 has an inner circumferential surface 37b (tapered surface portion) of the air introduction portion 37 for atomization. It is provided on the atomizing air introduction part 37 in the state which contacted so that it might be inserted in the contact. In this case, by pressing the liquid fuel tank 19 downward by the coil spring 36 (refer FIG. 4), the outer part 21b- of the lower surface 21b of the bottom part 21 of the liquid fuel tank 19 is carried out. 1) The (tapered surface portion) is pressed against the inner circumferential surface 37b (tapered surface portion) of the air introduction portion 37 for atomization, and is in close contact with each other to prevent a gap between these contact surfaces 21b-1 and 37b.

The nozzle main body part 39 of the air atomizing nozzle 38 has the inverse conical space part (concave part) 42 formed in the center, and its center (vertical position of the inverted conical space part 42) The fine spray hole 44 is formed in the. The space part 41 of the atomizing air introduction part 37 and the space part 42 of the nozzle main body part 39 are continuous, and these space parts 41 and 42 comprise the airflow confluence space part 43. Doing. That is, the two-fluid confluence space part 43 becomes circular in plan view (top surface), and has a taper structure which becomes small gradually as the diameter goes to the spray hole 44. As shown in FIG. In the atomizing air introduction portion 37, grooves (slits) 40 are formed in two places in the circumferential direction thereof. These grooves 40 are of the same pivot type as the grooves 40 of FIG. 5, and along the tangential direction of the circumference of the airflow confluence space portion 43 as viewed from the top, and also the airflow confluence space portion 43 with each other. The positional relationship of rotational symmetry (equal spacing in the circumferential direction) is around the central axis of. In addition, the groove | channel formed in the atomization air introduction part 37 is not limited to a swiveling type | mold, but may be of the collision type same as FIG.

The structure of the other part in the air atomizer 12 of FIG. 7 is the same as that of the air atomizer 12 of Example 1 (FIG. 4) of the said embodiment. In addition, also about the structure of parts other than the air atomizer in the air atomizer burner 11 of Example 3 of this embodiment, it is the same as the air atomizer burner 11 of the said Example 1 (FIGS. 1-3). same.

According to the two-fluid atomizing burner 11 of this Embodiment Example 3, the following effect is acquired, and also the other effect similar to the said Embodiment Examples 1 and 2 can also be obtained.

That is, according to the double-fluid atomizing burner 11 of Example 3 of this invention, the liquid fuel tank 19 is a taper surface part of the liquid fuel tank 19 (outer part of the lower surface 21b of the bottom part 21). (21b-1)] is provided on the atomizing gas introduction portion 37 in a state where it is brought into contact with the tapered surface portion (inner circumferential surface 37b) of the atomization gas introduction portion 37 so as to contact the liquid fuel tank. It is easy to align the central axis of the 19 with the two-fluid atomizing nozzle 38. Therefore, the width of the atomizing air flow path 28 is made uniform in the circumferential direction without biasing the liquid fuel tank 19, and the flow of the atomizing air 46 in the atomizing air flow path 28 is described above. Since it can be made uniform in a circumferential direction, the symmetry of spraying of the liquid fuel 24 from the spray hole 44 of the air atomizing nozzle 38 (namely, symmetry of flame) can be ensured.

In addition, in the double-fluid spray burner 11 of the third embodiment, the bottom portion of the liquid fuel tank 19 is pressurized downward by the coil spring 36 (see FIG. 4). (21) is pressurized to the atomizing air introduction part 37 of the air atomizing nozzle 38, and the taper surface part (outer part 21b-1) of the bottom part 21 of the fuel tank 19, and atomizing air By the taper surface part (inner circumferential surface 37b) of the introduction part 37 adhering closely, it can prevent that a clearance gap arises between these contact surfaces 21b-1 and 37b. For this reason, the atomization air 46 can be prevented from flowing to parts other than the groove | channel 40, and the effect of wide area spraying by the groove | channel 40 can fully be exhibited.

<Example 4>

FIG. 8 (a) is a longitudinal cross-sectional view showing the configuration of the lower portion of the double-fluid atomizer in the double-fluid atomizing burner according to Embodiment 4 of the present invention (vertical cross-sectional view as seen from the arrow direction of the GG line in FIG. 8 (b)). 8 (b) is a bottom view (shown in the H direction of FIG. 8 (a)) showing and extracting the liquid fuel tank provided in the air atomizer, and FIG. 8 (c) is FIG. 8 (b). 8 (d) is a cross sectional view seen from the arrow direction of the JJ line in FIG. 8 (a).

As shown in FIG. 8, in the air atomizer 12 of Example 4 of this embodiment, the inner surface (upper surface) 21a of the bottom part 21 of the liquid fuel tank 19 is tapered (reverse cone shape). And a fine liquid fuel outlet hole 22 is formed in the center (vertical position of the inverted conical taper surface). In addition, the outer surface (lower surface) 21b of the bottom portion 21 of the liquid fuel tank 19 has an outer portion 21b-1 as a tapered surface having a tapered shape (reverse cone shape), and an inner portion 21b. -2) is a circular horizontal plane.

On the other hand, the two-fluid atomizing nozzle 38 does not have an atomizing air inlet (refer to FIG. 7), and is formed integrally with the atomizer outer cylinder 27 at the lower end of the atomizer outer cylinder 27 (the separate one by welding or the like). Can be fixed). As for the dual-fluid atomizing nozzle 38, the inner surface (upper surface) 38a is a tapered surface of a tapered shape (inverted cone shape). For this reason, in the liquid fuel tank 19, the outer part 21b-1 (taper surface part) of the lower surface 21b of the bottom part 21 has the inner surface 38a (taper surface part) of the air atomizing nozzle 38. It is installed on the two-fluid atomizing nozzle 38 in the state which it contacted so that it might be inserted into (). In this case, by pressing the liquid fuel tank 19 downward by the coil spring 36 (refer FIG. 4), the outer part 21b- of the lower surface 21b of the bottom part 21 of the liquid fuel tank 19 is carried out. 1) (Tapered surface portion) is pressed against the inner surface 38a (tapered surface portion) of the dual-fluid atomizing nozzle 38 to be in close contact, and prevents a gap between these contact surfaces 21b-1 and 38b.

In addition, an inverted conical space portion formed in the central portion of the double-fluid spray nozzle 38 by the inner surface 38a of the tapered structure serves as the double-fluid confluence space 43. The fine spray hole 44 is formed in the center (vertical position of the inverse conical space portion 43) of this air confluence space part 43, and passes through the air confluence space part 43. As shown in FIG. That is, the two-fluid confluence space part 43 becomes circular in plan view (top surface), and has a taper structure which becomes small gradually as the diameter goes to the spray hole 44. As shown in FIG.

The grooves (slits) 71 are formed at two locations in the circumferential direction on the lower surface 21b side of the bottom portion 21 of the liquid fuel tank 19. These grooves 71 are pivotal and are rotationally symmetrical along the tangential direction of the air confluence space portion 43 as viewed from the top and around the central axis of the air confluence space portion 43 with each other. The relationship is equally spaced in the circumferential direction.

Therefore, the atomizing air 46 which flowed downward through the atomizing air flow path 28 flows through the groove | channel 71 in the bottom part 21 of the liquid fuel tank 19, and has a flow velocity in the state which accelerated the flow. It is introduced into the confluence space portion 43, becomes a swirl flow in this air confluence space portion 43, and merges with the liquid fuel 24 which flowed out from the liquid fuel outlet hole 22 of the liquid fuel tank 19 ( Mixing). As a result, the liquid fuel 24 and the atomizing air 46 are mixed well, and the liquid fuel 24 is combined with the atomizing air 46 together with the atomizing air 46 in the state of being atomized by the atomizing air 46. It is injected into the combustion space part 13 from the spray hole 44 of 38. As shown in FIG.

In addition, the structure of the other part in the air atomizer 12 of FIG. 8 is the same as that of the air atomizer 12 of Example 1 (FIG. 4) of the said embodiment. Moreover, also about the structure of parts other than the air atomizer in the air atomizer burner 11 of Example 4 of this embodiment, it is the same as the air atomizer burner 11 of the said Example 1 (FIGS. 1-3). same.

According to the two-fluid atomizing burner 11 of this Embodiment Example 3, the following effect is acquired, and also the other effect similar to the said Embodiment Example 1 can also be obtained.

That is, according to the double-fluid atomizing burner 11 of Example 4 of this invention, the liquid fuel 24 which flowed out from the liquid fuel outflow hole 44, and flowed into the double-fluid confluence space part 43 is an atomization air flow path. The atomizing air 46 and the air confluence space introduced from the bottom portion 21 of the liquid fuel tank 19 and introduced into the air confluence space portion 43 after flowing 28 through 28 are flowed downward. After joining in the section 43, the liquid fuel 24 speeds up the flow velocity in the groove 71 (horizontal velocity) by making the structure sprayed from the spray hole 44 together with the atomization air 46. The components are mixed well in the atomizing air 46 and the two-fluid confluence space 43 and sprayed from the spray holes 44. For this reason, the spread angle of the spray of the liquid fuel 24 becomes large compared with the case where the airflow confluence space part 43 and the groove 71 are not provided, and since the liquid fuel 24 is reliably atomized, a liquid fuel The combustibility of (24) is improved.

In the liquid fuel tank 19, 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) is the tapered surface portion of the air atomizing nozzle 38. Since it is provided on the two-fluid atomizing nozzle 38 in the state which contacted and inserted in [the inner surface 38a], it is easy to make the center axis of the liquid fuel tank 19 and the two-fluid atomizing nozzle 38 match. Do. Accordingly, the width of the atomizing air passage 28 is made uniform in the circumferential direction without biasing the liquid fuel tank 19, and the flow of the atomizing air 46 in the atomizing air passage 28 is maintained. Since it can be made uniform in the said circumferential direction, the symmetry (namely, flame symmetry) of the spray of the liquid fuel 24 from the spray hole 44 of the two-fluid atomizing nozzle 38 can be ensured.

In addition, the groove 71 of the bottom portion 21 of the liquid fuel tank 19 is formed so as to follow the tangential direction of the circumference of the air confluence space portion 43 as viewed from the upper surface, whereby the air confluence space portion At 43, the atomizing air 46 is swirled and mixed with the liquid fuel 24, so that the liquid fuel 24 and the atomizing air 46 are more reliably mixed. For this reason, the liquid fuel 24 injected from the spray hole 44 of the two-fluid atomizing nozzle 38 can be atomized more reliably, and the combustibility of the said liquid fuel 24 can be improved more.

Moreover, since the groove | channel 71 of the bottom part 21 of the liquid fuel tank 19 is formed in multiple numbers so that it may become rotationally symmetrical position relationship around the central axis of the air confluence space part 43, an air atomizing nozzle The distribution amount of the circumferential direction of the liquid fuel 24 sprayed from the spray hole 44 of 38 is made uniform, and the combustibility of the liquid fuel 24 can be improved.

In addition, in the double-fluid spray burner 11 of the fourth embodiment, the bottom portion of the liquid fuel tank 19 is pressurized downward by the coil spring 36 (see FIG. 4). (21) is pressurized to the air atomizing nozzle 38, and the tapered surface part (outer part 21b-1) of the bottom part 21 of the fuel tank 19 and the tapered surface part [of the air atomizing nozzle 38 [ By the inner surface 38a being in close contact, it is possible to prevent the gap between these contact surfaces 21b-1 and 38a. For this reason, the atomization air 46 is prevented from flowing to parts other than the groove | channel 71, and the effect of wide area spraying by the groove | channel 71 can fully be exhibited.

<Example 5>

FIG. 9 (a) is a longitudinal sectional view showing a configuration of a lower portion of an air atomizer in an air atomizer burner according to Embodiment 5 of the present invention (sectional view seen from the arrow direction of the KK line in FIG. 9 (b)). FIG. 9 (b) is a bottom view showing the liquid fuel tank provided in the air atomizer (shown in the L direction of FIG. 9 (a)), and FIG. 9 (c) is a It is a cross-sectional view seen from the arrow direction of MM line.

As shown in FIG. 9, in the air atomizer 12 of Example 5 of this Embodiment, the inner surface (upper surface) 21a of the bottom part 21 of the liquid fuel tank 19 is tapered (reverse cone shape). And a fine liquid fuel outlet hole 22 is formed in the center (vertical position of the inverted conical taper surface). In addition, the outer surface (lower surface) 21b of the bottom portion 21 of the liquid fuel tank 19 has an outer portion 21b-1 as a tapered surface having a tapered shape (reverse cone shape), and an inner portion 21b. -2) is a circular horizontal plane.

On the other hand, the two-fluid atomizing nozzle 38 does not have an atomizing air inlet (refer to FIG. 7), and is formed integrally with the atomizer outer cylinder 27 at the lower end of the atomizer outer cylinder 27 (the separate one by welding or the like). Can be fixed). As for the dual-fluid atomizing nozzle 38, the inner surface (upper surface) 38a is a tapered surface of a tapered shape (inverted cone shape). For this reason, in the liquid fuel tank 19, the outer part 21b-1 (taper surface part) of the lower surface 21b of the bottom part 21 has the inner surface 38a (taper surface part) of the air atomizing nozzle 38. It is installed on the two-fluid atomizing nozzle 38 in the state which contacted so that it might be inserted into the inside. In this case, by pressing the liquid fuel tank 19 downward by the coil spring 36 (refer FIG. 4), the outer part 21b- of the lower surface 21b of the bottom part 21 of the liquid fuel tank 19 is carried out. 1) (Tapered surface portion) is pressed against the inner surface 38a (tapered surface portion) of the dual-fluid atomizing nozzle 38 to be in close contact, and prevents a gap between these contact surfaces 21b-1 and 38b.

In addition, the reverse conical space formed in the central portion of the double-fluid atomizing nozzle 38 by the inner surface 38a of the tapered structure is the double-fluid confluence space 43. The fine spray hole 44 is formed in the center (vertical position of the inverse conical space portion 43) of this air confluence space part 43, and passes through the air confluence space part 43. As shown in FIG. That is, the two-fluid confluence space part 43 becomes circular in plan view (top surface), and has a taper structure which becomes small gradually as the diameter goes to the spray hole 44. As shown in FIG.

The grooves (slits) 81 are formed at four locations in the circumferential direction on the lower surface 21b side of the bottom portion 21 of the liquid fuel tank 19. These grooves 81 are impingement type and have a rotational symmetry positional relationship (circumference) along the radial direction of the air confluence space portion 43 and around the central axis of the air confluence space portion 43 when viewed from the top. It is formed so as to be equally spaced in the direction.

Therefore, the atomizing air 46 which flowed downward through the atomizing air flow path 28 flows through the groove | channel 81 in the bottom part 21 of the liquid fuel tank 19, and has a flow velocity in the state which has made the flow velocity fast. Joined (mixed) by introducing into the confluence space portion 43 and colliding with the liquid fuel 24 flowed out from the liquid fuel outflow hole 22 of the liquid fuel tank 19 in this air confluence space portion 43. do. As a result, the liquid fuel 24 and the atomizing air 46 are mixed well, and the liquid fuel 24 is combined with the atomizing air 46 together with the atomizing air 46 in the state of being atomized by the atomizing air 46. It is injected into the combustion space part 13 from the spray hole 44 of 38. As shown in FIG.

In addition, the structure of the other part in the air atomizer 12 of FIG. 9 is the same as that of the air atomizer 12 of Example 1 (FIG. 4) of the said embodiment. In addition, also about the structure of parts other than the air atomizer in the air atomizer burner 11 of Example 5 of this embodiment, it is the same as the air atomizer burner 11 of the said Example 1 (FIGS. 1-3). same.

According to the double-fluid atomizing burner 11 of this Embodiment 5, the same effect as the said Embodiment 4 is obtained, and also the same effect as the said Embodiment 1 can also be obtained.

That is, according to the double-fluid atomizing burner 11 of Example 5, the liquid fuel 24 which flowed out from the liquid fuel outflow hole 44, and flowed into the double-fluid confluence space part 43 is an atomization air flow path. The atomizing air 46 and the air confluence space introduced from the bottom portion 21 of the liquid fuel tank 19 and introduced into the air confluence space portion 43 after flowing 28 through 28 are flowed downward. After joining in the part 43, the liquid fuel 24 makes the flow velocity in the groove 81 fast (horizontal direction velocity) by making it sprayed from the spray hole 44 with this atomization air 46. The components are mixed well in the atomizing air 46 and the two-fluid confluence space 43 and sprayed from the spray holes 44. For this reason, the spread angle of the spray of the liquid fuel 24 becomes large compared with the case where the airflow confluence space part 43 and the groove 81 are not provided, and since the liquid fuel 24 is reliably atomized, it is a liquid fuel. The combustibility of (24) is improved.

In the liquid fuel tank 19, 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) is the tapered surface portion of the dual-fluid atomizing nozzle 38. Since it is provided on the two-fluid atomizing nozzle 38 in the state which contacted and inserted in [the inner surface 38a], it is easy to make the center axis of the liquid fuel tank 19 and the two-fluid atomizing nozzle 38 match. Do. Therefore, the width of the atomizing air flow path 28 is made uniform in the circumferential direction without biasing the liquid fuel tank 19, and the flow of the atomizing air 46 in the atomizing air flow path 28 is described above. Since it can be made uniform in a circumferential direction, the symmetry of spraying of the liquid fuel 24 from the spray hole 44 of the air atomizing nozzle 38 (namely, symmetry of flame) can be ensured.

In addition, the groove 81 of the bottom portion 21 of the liquid fuel tank 19 is formed so as to follow the tangential direction of the circumference of the air confluence space portion 43 as viewed from the upper surface, whereby the air confluence space portion At 43, the atomizing air 46 is swirled and mixed with the liquid fuel 24, so that the liquid fuel 24 and the atomizing air 46 are more reliably mixed. For this reason, the liquid fuel 24 injected from the spray hole 44 of the two-fluid atomizing nozzle 38 can be atomized more reliably, and the combustibility of the said liquid fuel 24 can be improved more.

Moreover, since the groove 81 of the bottom part 21 of the liquid fuel tank 19 is formed in multiple numbers so that it may become rotationally symmetrical position relationship around the central axis of the air confluence space 43, an air atomizing nozzle The distribution amount of the circumferential direction of the liquid fuel 24 sprayed from the spray hole 44 of 38 is made uniform, and the combustibility of the liquid fuel 24 can be improved.

In addition, in the double-fluid spray burner 11 of the fourth embodiment, the bottom portion of the liquid fuel tank 19 is pressurized downward by the coil spring 36 (see FIG. 4). (21) is pressurized to the air atomizing nozzle 38, and the tapered surface part (outer part 21b-1) of the bottom part 21 of the fuel tank 19 and the tapered surface part [of the air atomizing nozzle 38 [ By the inner surface 38a being in close contact, it is possible to prevent the gap between these contact surfaces 21b-1 and 38a. For this reason, the atomization air 46 can be prevented from flowing to parts other than the groove | channel 81, and the effect of wide area spraying by the groove | channel 81 can fully be exhibited.

<Example 6>

Fig. 10 (a) is a longitudinal sectional view showing the configuration of the lower part of the air atomizer in the air atomizing burner according to the sixth embodiment of the present invention, and Fig. 10 (b) is taken along line NN in Fig. 10 (a). It is a cross-sectional view seen from the arrow direction.

As shown in FIG. 10, in the air atomizer 12 of Example 6 of this Embodiment, the inner surface (upper surface) 21a of the bottom part 21 of the liquid fuel tank 19 is tapered (reverse cone shape). And a fine liquid fuel outlet hole 22 is formed in the center (vertical position of the inverted conical taper surface). Moreover, the outer surface (lower surface) 21b of the bottom part 21 of the liquid fuel tank 19 is also a tapered surface of a tapered shape (reverse cone shape). On the other hand, the two-fluid atomizing nozzle 38 does not have an atomizing air inlet (refer to FIG. 7), and is formed integrally with the atomizer outer cylinder 27 at the lower end of the atomizer outer cylinder 27 (the separate one by welding or the like). Can be fixed). As for the dual-fluid atomizing nozzle 38, the inner surface (upper surface) 38a is a tapered surface of a tapered shape (inverted cone shape).

On the lower end of the outer circumferential surface 20b of the side portion 20 of the liquid fuel tank 19, a plurality of support portions 91 are provided. 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 is inclined inward along the inner surface 38a of the air atomizing nozzle 38. Photo taper surface. Therefore, the liquid fuel tank 19 is supported in the contacted state so that the outer portion 91a-1 of the lower surface 91a of the support portion 91 is inserted into the inner surface 38a of the air atomizing nozzle 38. As a result, a tapered (reverse cone shaped) gap is secured between the outer surface 21a of the bottom portion 21 of the liquid fuel tank 19 and the inner surface 38a of the air atomizing nozzle 38, This gap serves as the atomizing air passage 92. That is, the outer side 1st atomization air flow path 28 and the inner side air confluence space part 43 are connected through the 2nd atomization air flow path 92. As shown in FIG.

The two-fluid confluence space portion 43 is an inverted cone-shaped space formed at the central portion of the two-fluid atomizing nozzle 38 by the inner surface 38a of the tapered structure. The fine spray hole 44 is formed in the center (vertical position of the inverse conical space portion 43) of this air confluence space part 43, and passes through the air confluence space part 43. As shown in FIG. That is, the airflow confluence space portion 43 is located below the liquid fuel outlet hole 22 and has a circular shape in plan view (upper surface), and the taper gradually decreases as the diameter thereof faces the spray hole 44. It is structured.

The atomizing air 46 which flowed down the atomizing air flow path 28 passes through the atomizing air distribution part 93 between the support parts 91, and distributes the atomizing air flow path 92, The confluence is introduced into the confluence space 43, and the confluence of the liquid fuel 24 flows out from the liquid fuel outlet hole 22 of the liquid fuel tank 19 in the two-fluid confluence space 43 so as to collide (mix). )do. As a result, the liquid fuel 24 moves from the spray hole 44 of the air atomizing nozzle 38 to the combustion space 13 together with the atomizing air 46 in a state of being atomized by the atomizing air 46. Sprayed.

In addition, the structure of the other part in the air atomizer 12 of FIG. 10 is the same as that of the air atomizer 12 of the said Example 1 (FIG. 4). In addition, also about the structure of parts other than the air atomizer in the air atomizer burner 11 of Example 6 of this embodiment, it is the same as the air atomizer burner 11 of the said Example 1 (FIGS. 1-3). same.

According to the double-fluid atomizing burner 11 of the sixth embodiment, the following effects can be obtained, and in addition, the same effects as the first embodiment can be obtained.

That is, according to the double-fluid atomizing burner 11 of Example 6 of this invention, the liquid fuel 24 which flowed out from the liquid fuel outflow hole 22, and flowed into the double-fluid confluence space part 43 is used for 1st atomization. After flowing the gas flow path 28 downward, it passes through the atomization air distribution part 93 between the support parts 91, flows through the 2nd atomization air flow path 92, and was introduced into the air confluence space part 43. As shown in FIG. The liquid in the liquid fuel tank 19 is formed by joining the atomizing air 46 and the two-fluid confluence space portion 43 and then spraying the atomizing air 46 from the spray hole 44 together with the atomizing air 46. The liquid fuel 24 discharged from the fuel outlet hole 22 is injected from the spray hole 44 of the air atomizing nozzle 38 after mixing with the atomizing air 46 and the air confluence space portion 43. . For this reason, compared with the case where the airflow confluence space part 43 is not provided, the spread angle of the spray of the liquid fuel 24 becomes large, and since the liquid fuel 24 is reliably atomized, the combustibility of a liquid fuel improves. .

<Example 7>

FIG. 11 is a longitudinal sectional view showing the configuration of the dual-fluid atomizing burner according to the seventh embodiment of the present invention, and FIG. 12 is a cross sectional view seen from the arrow direction of the O-O line in FIG. 11.

As shown in FIG. 11 and FIG. 12, in the two-fluid atomizing burner 11 of the seventh embodiment, the plate 18 is a porous plate. That is, the annular plate 18 is provided with a plurality of combustion air distribution holes 101. All of these combustion air flow holes 101 are provided inside the combustion air flow holes 52 (the first cylinder 16). Therefore, the combustion air 50 which flowed down the combustion air flow path 15 mainly passes through the combustion air distribution hole 52 of the outer peripheral side of the plate 18, and is the outer side of the 1st cylinder 16. As shown in FIG. After flowing through the combustion air flow path 53, it flows into the combustion space part 13, but a part flows into the combustion space part 13 through the combustion air distribution hole 101 inside the 1st cylinder 16. As shown in FIG. do.

In addition, the structure of the other part in the air atomizing burner 11 of FIG. 11 and FIG. 12 is the same as that of the air atomizing burner 11 of Example 1 (FIGS. 1-3) of the said Embodiment.

According to the dual-fluid atomization burner 11 of the seventh embodiment, the following effects can be obtained, and in addition, the same effects as those of the first embodiment can be obtained.

That is, according to the double-fluid atomizing burner 11 of Example 7 of this embodiment, in the plate 18, what formed the some air flow hole 101 for combustion other than the air flow hole 52 for combustion was formed. As a result, part of the combustion air 50 also passes through these combustion air distribution holes 101, so that the combustion air is stagnated near the lower surface of the plate 18 by the flow of the combustion air 50. It can suppress generation | occurrence | production of a flow, and can suppress that soot adheres to the lower surface of the plate 18. In addition, since low-temperature combustion air flows in the vicinity of the air atomizing nozzle 38 through another combustion air distribution hole 101, the air atomizing nozzle which is easily overheated by radiant heat of flame by this air for combustion ( The effect of cooling 38) can also be obtained.

<Example 8>

Fig. 14A is a longitudinal sectional view showing the structure of an air atomizing burner according to Embodiment 8 of the present invention, Fig. 14B is a cross sectional view seen from the arrow direction of the PP line in Fig. 14A, and Fig. 15 is a It is a figure which shows the relationship between the ratio L / D of the distance L from the spray hole of an air atomizer to the throttle plate, the diameter D of the combustion space part, and the optimal installation position of the throttle plate.

As shown in FIG.14 (a) and FIG.14 (b), in the two-fluid atomizing burner 11 of this Embodiment 8, the throttle board 121 is carried out in the combustion space part 13 in the burner outer cylinder 48. As shown in FIG. This is provided. The throttle plate 121 is an annular shape in which a circular flow hole (throttle hole) 122 is opened at the center portion. And the throttle plate 121 is horizontally arrange | positioned at the lower end part of the extended burner outer cylinder 48, and is located below the plate 18, the 1st cylinder 16, etc., and is welded to the inner surface of the burner outer cylinder 48, and the like. It is fixed by fixing means, such as these. As shown in FIG.14 (b), the circulation hole 122 of the throttle plate 121 is located in the center part of the combustion space part 13 in plan view.

Therefore, the combustion air 50 which flowed the combustion space 13 downward is guided to the center part of the combustion space 13 by the throttle plate 121 as shown by the arrow in FIG. , And passes through the distribution hole 122 of the throttle plate 121. Incidentally, the throttle plate 121 is not necessarily limited to the horizontal plate as shown by a solid line in Fig. 14 (a), and is inclined plate (inverted cone shape) as shown virtually by a dashed line in Fig. 14 (a). Plate) may be used.

The structure of the other part in the two-fluid atomizing burner 11 of FIG. 14 is the same as that of the two-fluid atomizing burner 11 of the said Example 1 (FIGS. 1-3).

Therefore, according to the double-fluid spray burner 11 of the eighth embodiment of the present invention, the same effects as those of the first embodiment can be obtained, and the following effects can also be obtained.

That is, according to the double-fluid atomizing burner 11 of this Embodiment 8, the combustion space part 13 is provided with the throttle plate 121 in which the flow hole 122 was opened in the center part, and the combustion space part 13 was carried out. To guide the combustion air 50 flowing downward through the throttle plate 121 to the center portion of the combustion space 13 and to allow the flow hole 122 of the throttle plate 121 to pass. As a result, the mixing of the combustion air 50 and the unburned gas (the one in which the sprayed liquid fuel is heated and vaporized or not yet burned) is promoted. As a result, since combustion of unburned gas is accelerated | stimulated, a fuel can be fully burned and the flame 123 can also be made single.

In detail, when the combustion air flow path 53 is distributed and the combustion air 50 (the 1st cylinder 16 which flowed in into the combustion space part 13 from the lower end of the combustion air flow path 53 is not provided), The combustion air 50 flowing into the combustion space 13 through the combustion air distribution hole 52 flows downward through the combustion space 13 to the center of the combustion space 13. By purging, it mixes with the unburned gas and burns the unburned gas. However, the combustion air 50 does not spread widely to the center of the combustion space 13, and 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 121 in the combustion space part 13, mixing of the combustion air 50 and the unburned gas is delayed, and the unburned part (unburned gas) of a fuel is easy to remain, and a flame 123 is also longer.

On the other hand, when the throttle plate 121 is provided in the combustion space part 13 as mentioned above, the combustion air 50 which flowed downward is interrupted | blocked by the throttle plate 121, and the distribution hole 122 of the center part is carried out. Since it 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, fuel becomes easy to burn completely, CO is reduced, and flame 123 is also mono-ized.

Furthermore, according to the double-fluid atomizing burner 11 of the eighth embodiment of the present invention, since fluid such as combustion air is throttled once in the flow hole 122 of the throttle plate 121, the flow rate distribution of the fluid is circumferentially. Homogenized. For this reason, a furnace etc. can also be heated uniformly in a circumferential direction by combustion exhaust gas.

In addition, as shown in FIG. 14, the distance from the spray hole 44 of the air atomizer 12 to the throttle plate 121 is called L, and the inner diameter of the burner outer cylinder 48 (of the combustion space 13). When diameter] is D, it is preferable to make L / D into the range of 2-10 (region I of FIG. 15). When the L / D is smaller than 2 (area II in Fig. 15), since a relatively large amount of air is supplied at one time and the flame is cooled, the fuel is less likely to vaporize, and droplets tend to be generated. On the other hand, when the L / D is larger than 10 (area III in FIG. 15), the supply of air is delayed and the ratio of mixing with the unburned gas whose temperature has decreased increases, so that combustion of unburned gas (in air) Reaction with O) is difficult to promote.

In addition, as shown in FIG. 14, when the diameter of the flow hole 122 of the throttle plate 121 is d, it is preferable to make d / D into the range of 0.2-0.6. When smaller than 0.2, the pressure rise of the combustion space part 13 becomes large, and when larger than 0.6, the mixing effect of air and unburned gas becomes weak.

<Example 9>

(A) is a longitudinal cross-sectional view which shows the structure of the two-fluid atomizing burner concerning Embodiment 9 of this invention, and FIG. 16 (b) is a cross section seen from the arrow direction of the Q-Q line | wire of FIG. 16 (a). 16 (c) is a cross-sectional view corresponding to FIG. 16 (b) and shows another structural example of the revolving spring.

As shown to FIG.16 (a)-FIG.16 (c), in the two-fluid atomizing burner 11 of this Embodiment 9, the turning spring 124 is provided above the throttle plate 121. As shown to FIG. The revolving spring 124 is arranged in the circumferential direction of the flow hole 122 at the periphery of the flow hole 122 of the throttle plate 121 at a plurality of sheets (six pieces) at regular intervals, and the upper surface of the throttle plate 121. The inner surface of the burner outer cylinder 48 is fixed by fixing means such as welding. The turning springs 124 are all provided along the substantially tangential direction of the circular flow hole 122 in plan view. Therefore, as shown by the arrows in FIGS. 16 (b) and 16 (c), the flow of the combustion air 50 passing through the flow holes 122 of the throttle plate 121 is caused by the turning spring 124. It is a swirl flow.

In addition, the turning spring 124 is not limited to the tangential direction of the distribution hole 122, The side surface should just incline with respect to the radial direction of the distribution hole 122 in plan view. In addition, the turning spring 124 may be a flat plate shape as shown in FIG. 16 (b), and may be curved as shown in FIG. 16 (c).

The structure of the other part in the two-fluid atomizing burner 11 of FIG. 16 is the same as that of the two-fluid atomizing burner 11 of the said Example 1, 8 (FIGS. 1-3, 14).

Therefore, according to the double-fluid atomizing burner 11 of Example 9 of this Embodiment, the effect similar to the said Embodiment Examples 1 and 8 is acquired, and also the following effect can be obtained.

That is, according to the double-fluid atomizing burner 11 of Example 9 of this invention, the turning spring 124 is provided above the throttle plate 121, and the combustion passes through the distribution hole 122 of the throttle plate 121. Since the flow of the air 50 is made into the swirl flow by the swing spring 124, the flow hole 122 of the throttle plate 121 is shown by the arrow to FIG. 16 (a). The combustion air 50 passing through) is spread in the horizontal direction by turning. As a result, since the pressure of the center part of the flow of the combustion air 50 falls below the flow hole 122, the combustion air which flows into the said center part from the outer side as shown by the arrow in FIG. Circulating flow of 50) occurs. Therefore, since the mixing of the combustion air 50 and the unburned gas is further promoted, and the combustion of the unburned gas is further promoted, the fuel is more likely to burn more completely, and the flame 123 is further shortened.

<Example 10>

FIG. 17 (a) is a longitudinal cross-sectional view showing the configuration of the dual-fluid atomizing burner according to the tenth embodiment of the present invention, and FIG. 17 (b) is a cross section seen from the arrow direction of the R-R line in FIG. 17 (a).

As shown to FIG. 17 (a) and FIG. 17 (c), in the two-fluid atomizing burner 11 of Example 10 of this Embodiment, the porous space of two or more (two pieces in illustration) in the combustion space part 13 is shown. 125 is provided. The number of porous plates 125 is not limited to one, but may be one. The porous plate 125 is located above the throttle plate 121, that is, between the plate 18 (first cylinder 16) and the throttle plate 121.

The porous plate 125 is an annular plate in which one relatively large diameter opening hole 127 is opened in the center portion, and a plurality of relatively small diameter holes 126 are opened in the peripheral portion thereof. And the porous plate 125 is arrange | positioned horizontally in the combustion space part 13, and is fixed to the inner surface of the burner outer cylinder 48 by fixing means, such as welding. As shown in FIG. 17 (b), in a plan view, the flow hole 127 of the porous plate 125 is located at the center of the combustion space 13.

Therefore, a part of the combustion air 50 which flowed downward in the combustion space 13 is guide | induced to the distribution hole 127 of the center part (namely, the center part of the combustion space 13) by the porous plate 125. It passes through the flow hole 127, and the other combustion air 50 flows through the hole 126 downward. For example, in the upper perforated plate 125, 20% of the combustion air 50 flowing downward toward the perforated plate 125 is led to the center portion, and 80% passes through the hole 126 to be further downward. In the lower perforated plate 125, 40% of the combustion air 50 flowing downward toward the perforated plate 125 is directed to the center portion, and 60% passes further through the hole 126. To flow.

The structure of the other part in the two-fluid atomizing burner 11 of FIG. 17 is the same as that of the two-fluid atomizing burner 11 of the said Example 1, 8, 9 (FIGS. 1-3, 14).

Therefore, according to the double-fluid atomizing burner 11 of Example 10 of this Embodiment, the effect similar to the said Example 1, 8, 9 is obtained, and the following effect can also be obtained.

That is, according to the double-fluid atomizing burner 11 of this Embodiment 10, the porous board 125 with which the distribution hole 127 was opened in the center part is provided in the combustion space part 13 above the throttle board 121. As shown in FIG. Then, a part of the combustion air 50 flowing down the combustion space 13 is led by the porous plate 125 to the center portion of the combustion space 13, and the distribution hole 127 of the porous plate 125 is provided. In this case, the mixture 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. Flame 123 is also more monolithic.

<Example 11>

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 air atomizing burner 11 according to any one of 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, the combustion furnace 112 is provided in the upper part of the reformer 111, and the air atomizing burner 11 in any one of the said Embodiment Examples 1-10 from the upper part of this combustion furnace 112. As shown in FIG. ) Is inserted. The liquid fuel supply system, the atomization air supply system, and the combustion air supply system which are not shown in figure are connected to the two-fluid atomizing burner 11. In addition, the detail of the air atomizing burner 11 is as above-mentioned.

A reformer 111 is connected to a raw material supply system (not shown), and reformed fuel such as methane gas and kerosene and water are supplied as raw materials for reforming from the raw material supply system. In the reformer 111, the reformed fuel is steam-modified by steam reforming of the reforming fuel using heat of a large amount of combustion exhaust gas generated by combustion in the two-fluid atomizing burner 11, thereby reforming gas (gas containing a lot of hydrogen). Create The reformed gas generated by the reformer 111 is supplied to the anode side of the fuel cell 113 as fuel for power generation. In the fuel cell 113, power generation is performed by electrochemically reacting the reformed gas (hydrogen) supplied to this anode side and the air (oxygen) supplied to a cathode side. The remaining reformed gas not used for power generation in the fuel cell 113 is returned to the two-fluid atomizing burner 11, where it is used as a gaseous fuel for burner combustion.

According to the fuel cell power generation system of the eleventh embodiment, since the two-fluid spray burner 11 according to any of the first to tenth embodiments is used as a heat source of the reformer 111, the two-fluid spray burner 11 By exerting the above excellent effects, the performance of the reformer 111 can be improved, the cost can be reduced, and the like.

In addition, although only one liquid fuel outflow hole 22 is provided in the liquid fuel tank 19 above, it is not limited to this, You may provide the some liquid fuel outflow hole 22. FIG.

In addition, although the liquid fuel outflow hole was provided in the bottom part of the liquid fuel tank in the above, it is not necessarily limited to this, You may provide a liquid fuel outflow hole in the side part of a 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 located below the liquid level of the stored liquid fuel and opened to the side or bottom portion. What is necessary is just a structure which flows out the said stored liquid fuel from the said one or some liquid fuel outflow hole.

In addition, although the liquid fuel tank is provided in the atomizer outer cylinder in the above, it is not necessarily limited to this, For example, the liquid fuel tank is provided in the exterior of the atomizer outer cylinder, and the liquid flowed out from the liquid fuel outflow hole of the liquid fuel tank. The fuel may be supplied to a confluence space portion with the atomizing gas via a pipe or the like.

In addition, although the pressure of the atomizing air which flows in into the atomization air flow path by opening the upper end side of a liquid fuel tank acts on the liquid level of the liquid fuel stored in the liquid fuel tank in the above, it is necessarily limited to this. For example, the upper end side of the liquid fuel tank may be opened to the atmosphere. In other words, due to the pressure balance between the inside and the outside of the liquid fuel tank (the air confluence space portion), the liquid fuel flowing out from the liquid fuel supply pipe is once stored in the liquid fuel tank, so that the liquid head of the liquid fuel is generated. What is necessary is just the structure which flows out the liquid fuel continuously from a liquid fuel outlet hole.

In addition, although two groove | channels are provided in the turning type and four in the collision type | mold in the above, it is not limited to this and can be made into a suitable number. However, in order to ensure the uniformity of the circumferential distribution of the spray amount of the liquid fuel, it is preferable that the number of the grooves be two or more in the swing type and the number of the grooves in the collision type to three or more.

In addition, the structure (invention) which provides the plate (shielding plate), the 1st cylinder for delaying the combustion air supply, the 2nd cylinder for stagnation prevention, etc. as mentioned above, inject | pours the liquid fuel and atomization gas as mentioned above. The present invention is applicable not only to a dual atomizer burner provided with a double atomizer as a fuel injector, but also to a burner equipped with a fuel injector for injecting only liquid fuel and a fuel injector for injecting gaseous fuel.

In addition, although the air circulation hole for combustion is provided in the outer peripheral side of a plate (shielding plate) by forming a processus | protrusion in the outer periphery of a plate (shielding plate) above, it is not limited to this, What is necessary is just to provide the combustion air distribution hole in the outer peripheral side, for example, you may provide a combustion air distribution hole in the outer peripheral side of a plate by forming a hole in the periphery of the plate (shielding plate) itself.

In addition, although the plate (shielding plate) is made into a horizontal plate in the above, it is not limited to this, The plate (shielding plate) may be inclined inclined downward from the inner side to the outer side. For example, the plate 18 may be shaped like a cone as shown by a dashed-dotted line in FIG. 11. In the case of this inclined plate, not only the combustion air is kept away from the fuel injection nozzle (the air atomizing nozzle 38), but also the same function as the first cylinder for delaying the supply of the combustion air is exerted.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner, and is useful for, for example, when it is necessary to generate a large amount of combustion exhaust gas in order to heat a reformer or the like of a large capacity fuel cell power generation system.

Claims (8)

In the burner which injects fuel and combusts from the fuel injection nozzle of a fuel injector to the combustion space part below the said fuel injection nozzle, A cylindrical combustion air flow path formed between the fuel injector and a burner outer cylinder surrounding the fuel injector; A shielding plate for dividing the combustion air passage and the combustion space; It is provided with the air circulation hole for combustion provided in the outer peripheral side of the said shielding plate, Combustion air flowing downward through the combustion air flow path is separated from the fuel injection nozzle by being blocked by the shielding plate and guided to the outer circumferential side of the shielding plate, passing through the combustion air distribution hole, and Characterized in that configured to flow into the combustion space portion burner. The method of claim 1, Providing a combustion air supply retardation cylinder extending downward from the lower surface of the shielding plate, and forming another cylindrical air flow passage for communicating with the combustion air distribution hole between the passage and the burner outer cylinder; The combustion air which passed the said combustion air flow hole flows into the said combustion space part from the lower end of the said other combustion air flow path, after flowing down the said other combustion air flow path, It is characterized by the above-mentioned. burner. The method of claim 2, One or more cylinders for stagnation prevention extending downward from the lower surface of the shielding plate are provided inside the cylinder for delaying air supply for combustion. burner. The method according to any one of claims 1 to 3, In the shielding plate, a plurality of combustion air distribution holes are formed inside the combustion air distribution hole. burner. The method according to any one of claims 1 to 4, The fuel injector is to inject liquid fuel from the fuel injection nozzle, A gaseous fuel supply pipe surrounding the fuel injector and a cylindrical gas fuel flow path between the fuel injector, A gaseous fuel flows below the said gaseous fuel flow path, and it is set as the structure which is injected and combusted from the lower end of the said gaseous fuel flow path to the said combustion space part, It is characterized by the above-mentioned. burner. The method according to any one of claims 1 to 5, A throttle plate having a distribution hole open in the center portion is provided in the combustion space portion, The combustion air which flowed into the said combustion space part below is guided to the center part of the said combustion space part by the said throttle plate, and it is set as the structure which makes the flow hole of the throttle plate pass. burner. The method of claim 6, A pivot spring is provided on the upper side of the throttle plate, It is set as the structure which makes the flow of the combustion air which passes through the flow hole of the throttle plate into the swirl flow by the said swing spring. burner. The method according to claim 6 or 7, A porous plate having a distribution hole open in the center portion is provided in the combustion space portion above the throttle plate, A part of the combustion air which flowed downward in the said combustion space part is guided to the center part of the said combustion space part by the said porous plate, and it is set as the structure which passes the distribution hole of the said porous plate, It is characterized by the above-mentioned. burner.

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