JP2002267110A - Atomizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable sufficient atmization of spray without increasing a cost irrespective of nature of liquid fuel. SOLUTION: Fuel is fed to a single mixture fluid passage 3 through two fuel passages 5, and through the relative increase of an expansion force of vapor S, formation of a liquid film on the wall surface of the mixture fluid passage 3 is reduced and liquid fuel F is brought into a fog state with the thickness of the liquid film being thinned. Pulverization of the liquid fuel F is promoted by reducing formation of the fuel film in the mixture fluid passage 3 and spray can be sufficiently atmized without increasing a cost irrespective of nature of the liquid fuel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an atomizer for a liquid fuel burner in a boiler for thermal power generation, a gasifier or a chemical industrial furnace.

[0002]

2. Description of the Related Art For example, a furnace of a power generation boiler is provided with a liquid fuel burner, and fuel is atomized by an atomizer and ejected into a road. The atomizer is provided with a mixed fluid passage having a jet port facing the inside of the furnace at the tip, and the atomizing fluid passage and the opening of the fuel passage are provided to face the mixed fluid passage, respectively. The atomizing fluid (for example, saturated vapor) is pumped from the atomizing fluid passage to the mixed fluid passage, and the liquid fuel is pumped from the fuel passage to the mixed fluid passage. Is sprayed into the furnace with the atomized mixed fluid.

[0003]

In recent years, heavy oil has been used as a liquid fuel from the viewpoint of fuel economy and long-term stable supply. Since heavy oil has a very high viscosity at room temperature, it is difficult to atomize the atomized oil with an atomizer. Conventionally, in order to promote atomization of heavy oil even in the case of heavy oil, measures such as raising the oil spray temperature to lower the viscosity and increasing the amount of steam as the atomized fluid have been taken. However, in recent years, the viscosity of liquid fuel has been increasing, and there is a demand for a technique capable of atomizing spray without increasing the cost regardless of the properties of the liquid fuel.

The present invention has been made in view of the above circumstances, and has as its object to provide an atomizer that can sufficiently atomize spray without increasing the cost regardless of the properties of liquid fuel.

[0005]

In order to achieve the above object, an atomizer according to the present invention has a structure in which an atomizing fluid passage and an opening of a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at a tip thereof. The atomizer provided to face is provided with fuel film formation reducing means for preventing formation of a fuel film on the inner periphery of the mixed fluid passage.

[0006] The fuel film formation reducing means increases the expansion force of the atomized fluid by making a plurality of openings of the fuel passage face the mixed fluid passage, and causes the fuel to collide with each other inside the mixed fluid passage. It is characterized by comprising. Further, the fuel film formation reducing means is configured such that the atomized fluid passage and the fuel passage extend at a symmetrical angle with respect to the mixed fluid passage so that the openings of the atomized fluid passage and the fuel passage face the mixed fluid passage, and the mixing is performed. It is characterized in that it is configured to promote collision between the atomizing fluid and the fuel inside the fluid passage. Further, the fuel film formation reducing means is configured such that the atomization fluid passage faces the atomization fluid passage through the perforated pipe with respect to the mixture fluid passage so that the atomization fluid becomes uniform inside the mixture fluid passage. And Further, the fuel film formation reducing means is configured to cause the atomized fluid passage to face the mixed fluid passage through the swirling groove-shaped inner peripheral surface portion and to generate a swirling flow in the atomized fluid inside the mixed fluid passage. It is characterized by having. Further, the fuel film formation reducing means is provided with a bypass which communicates the atomized fluid passage and the fuel passage, mixes a part of the atomized fluid inside the fuel passage, and converts the atomized fuel into the mixed fluid passage. It is characterized in that it is configured to input.

According to another aspect of the present invention, there is provided an atomizer, wherein an atomizing fluid passage and a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at a tip thereof. In the atomizer,
The fuel cell system further comprises a fuel film thickness reducing means for reducing the film thickness of the fuel film formed on the inner periphery of the mixed fluid passage.

The fuel film thickness reducing means is characterized in that a swirl groove is formed in the inner periphery of the mixed fluid passage to promote a turbulent flow of the mixed fluid. Further, the fuel film thickness reducing means feeds the atomized fluid toward the fuel film with the second opening of the atomized fluid passage facing the mixed fluid passage on the downstream side of the atomized fluid passage and the opening of the fuel passage. It is characterized by having such a configuration.

According to another aspect of the present invention, there is provided an atomizer, wherein an atomizing fluid passage and an opening of a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at a tip thereof. In the atomizer,
A fuel atomization accelerating means for atomizing the fuel particles ejected from the ejection port of the mixed fluid passage is provided.

Further, the fuel atomization promoting means is characterized in that the mixed fluid passage is gradually increased in diameter toward the jet port to increase the wet edge length of the jet port. Further, the fuel atomization promoting means is configured such that a rod material extending in the longitudinal direction of the mixed fluid passage and having a threaded groove formed on the outer periphery is disposed at a central portion of the mixed fluid passage so that the outer peripheral surface of the rod material is a wet edge. It is characterized by having been done. Further, the rod material has a function of promoting the turbulent flow of the mixed fluid by the thread-shaped groove to reduce the thickness of the fuel film formed on the inner periphery of the mixed fluid passage.

According to another aspect of the present invention, there is provided an atomizer in which an atomizing fluid passage and an opening of a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at a tip thereof. In the atomizer,
The fuel supply system further includes a fuel particle size equalizing unit that equalizes fuel particles ejected from the ejection port of the mixed fluid passage.

The fuel particle size equalizing means arranges the fuel passage in a direction eccentric from the center of the mixed fluid passage, causes the fuel passage to face the mixed fluid passage, and swirls the fuel inside the mixed fluid passage. It is characterized by comprising. Further, the fuel particle size equalizing means arranges a plurality of fuel passages in a direction eccentric from the center of the mixed fluid passage, causes the plurality of fuel passages to face the mixed fluid passage, and swirls the fuel inside the mixed fluid passage. It is characterized by comprising.

According to another aspect of the present invention, there is provided an atomizer in which an atomizing fluid passage and an opening of a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at a tip thereof. In the atomizer,
Means for reducing the formation of a fuel film on the inner periphery of the mixed fluid passage, means for reducing the film thickness of the fuel film formed on the inner periphery of the mixed fluid passage, injection of the mixed fluid passage At least two means are provided: fuel atomization accelerating means for making fuel particles ejected from an outlet finer, and fuel particle size equalizing means for equalizing fuel particles ejected from an outlet of a mixed fluid passage. It is characterized by.

[0014]

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

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of an atomizer according to a first embodiment of the present invention, FIG. 2 is a vertical sectional view of FIG.
FIG. 3 is a view taken along the line III-III in FIG.

As shown in FIGS. 1 and 2, an atomizer 1
Has a flat surface on one side (right side in FIG. 2) and a frustoconical shape on the other side (left side in FIG. 2). One end of the atomizer 1 is connected to a tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

A counterbore 2 as a frustoconical atomizing fluid passage is formed at the center of one surface of the atomizer 1 on the side to which the steam S and the liquid fuel F are sent, and A plurality (six in the illustrated example) of mixed fluid passages 3 are provided radially toward the side inclined portion of the truncated cone on the surface. Steam S is supplied to the counterbore 2, and the opening 2 a of the mixed fluid passage 3 with respect to the counterbore 2 is an opening of the atomizing fluid passage facing the mixed fluid passage 3. The opening 3a (that is, the tip of the mixed fluid passage 3) of the inclined side surface of the mixed fluid passage 3 faces a furnace (not shown).

A circumferential groove 4 is formed around the counterbore 2 on one side of the atomizer 1, as shown in FIGS. 1 to 3, between each mixed fluid passage 3 and the groove 4. Are provided with two fuel passages 5 (fuel film formation reducing means). The liquid fuel F is sent to the groove 4, and an opening 5 a of the fuel passage 5 with respect to the mixed fluid passage 3 is an opening of the fuel passage facing the mixed fluid passage 3.

Steam S and liquid fuel F are supplied from a nozzle (not shown) to the atomizer 1, steam S is sent from the counterbore 2 to the mixed fluid passage 3, and from the groove 4 passes through the fuel passage 5 to the mixed fluid passage 3. Liquid fuel F is sent. In the mixed fluid passage 3, since the expansion force of the steam S is high, the liquid fuel F
Adheres to the wall surface of the mixed fluid passage 3, and the liquid film on the wall surface gradually decreases toward the opening 3a due to the expansion force of the vapor S. The liquid film is torn off at the edge of the opening 3a of the mixed fluid passage 3 to form a mist, and the liquid fuel F becomes a mixed fluid in which the liquid fuel F is atomized. The mixed fluid in which the liquid fuel F is atomized is ejected from the opening 3a into the furnace.

Since fuel is sent from two fuel passages 5 to one mixed fluid passage 3, the amount of liquid fuel F sent from one fuel passage 5 is relatively to the amount of steam S. As the amount decreases, the liquid fuels F collide with each other inside the mixed fluid passage 3. For this reason, the expansion force of the steam S becomes relatively high, the formation of the liquid film on the wall surface of the mixed fluid passage 3 is reduced, and the liquid fuel F is atomized in a state where the thickness of the liquid film is reduced. You.

Thus, the atomization of the liquid fuel F is promoted by a simple structure in which the two fuel passages 5 are provided, and the atomization can be sufficiently atomized even when the liquid fuel F having a high viscosity is used. Even if high quality oil or the like is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. Incidentally, it has been confirmed that the spray particle diameter can be reduced by about 10% as compared with the case where the liquid fuel is supplied from one fuel passage.

A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a front view of an atomizer according to a second embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of FIG.

As shown in FIG. 5, the atomizer 6 has a flat surface on one side (right side in FIG. 5) and a truncated cone shape on the other side (left side in FIG. 5). One end of the atomizer 6 is connected to the tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

As shown in FIGS. 4 and 5, a frusto-conical counterbore 7 is formed at the center of one surface of the atomizer 6 to which the steam S and the liquid fuel F are sent, and the other surface. A plurality of (six in the illustrated example) mixed fluid passages 8 whose bottoms are closed are formed on the side inclined portions of the truncated cone. The opening 8a (that is, the end of the mixed fluid passage 8) of the side inclined portion of the mixed fluid passage 8 faces a furnace (not shown). Counterbore part 7
Is supplied with steam S, and an atomizing fluid passage 9 extending from the counterbore portion 7 to the mixed fluid passage 8 is formed. The atomizing fluid passage 9 faces the mixed fluid passage 8 and opens at the opening 9a.

A circumferential groove 10 is formed around the counterbore 7 on one surface of the atomizer 6, and a fuel passage 11 extending from the groove 10 to the mixed fluid passage 8 is formed. The fuel passage 11 is open at the opening 11a. The opening 9a of the atomizing fluid passage 9 and the opening 11 of the fuel passage 11
a is open at the same position in the axial direction of the mixed fluid passage 8. The angle formed by the axis of the atomizing fluid passage 9 and the axis of the mixed fluid passage 8 and the angle formed by the axis of the fuel passage 11 and the axis of the mixed fluid passage 8 are the same angle θ.

Atomizing fluid passage 9 relative to mixed fluid passage 8
The configuration of the fuel passage 11 constitutes a means for reducing fuel film formation.

Steam S and liquid fuel F are supplied from a nozzle (not shown) to the atomizer 6, steam S is sent from the counterbore 7 through the atomizing fluid passage 9 to the mixed fluid passage 8, and the fuel passage 11 from the groove 10. , The liquid fuel F is sent to the mixed fluid passage 8. Similarly to the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 8, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 8a into the furnace.

Since the atomizing fluid passage 9 and the fuel passage 11 are open to the mixed fluid passage 8 at the same position and the same angle, the liquid fuel F and the vapor S collide violently and adhere to the wall surface of the mixed fluid passage 8. The formation of the liquid film is promoted, and the liquid fuel F is atomized while the liquid film is thin.

Thus, atomization of the liquid fuel F is promoted by a simple structure in which the atomized fluid passage 9 and the fuel passage 11 are opened at the same position and the same angle in the mixed fluid passage 8, and the high-viscosity liquid fuel F is supplied. Even when used, the spray can be sufficiently atomized, and even when heavy oil or the like is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. Incidentally, it has been confirmed that the spray particle diameter can be reduced by about 5% to 10% as compared with the case where the liquid fuel is supplied from one fuel passage.

A third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a front view of an atomizer according to a third embodiment of the present invention, FIG. 7 is a longitudinal sectional view of FIG.
FIG. 8 is a view taken along line VIII-VIII in FIG.

As shown in FIGS. 6 and 7, the atomizer 12
Has a flat surface on one side (right side in FIG. 7) and a frustoconical shape on the other side (left side in FIG. 7). One end of the atomizer 1 is connected to a tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

A counterbore 13 as a frustoconical atomizing fluid passage is formed at the center of one surface of the atomizer 12 on the side to which the vapor S and the liquid fuel F are sent, and from the counterbore 13 to the other side. A plurality of (six in the illustrated example) mixed fluid passages 14 are provided radially toward the side inclined portion of the truncated cone on the surface. The opening 14a of the side inclined portion of the mixed fluid passage 14 (that is, the tip of the mixed fluid passage 14) faces a furnace (not shown).

The counterbore 13 on one side of the atomizer 12
A circumferential groove 15 is formed around the periphery of the fuel passage 16, a fuel passage 16 is provided between the mixed fluid passage 14 and the groove 15, and an opening 16 a of the fuel passage 16 with respect to the mixed fluid passage 14 is formed by the mixed fluid passage 14. It is the opening of the fuel passage facing.

The steam S is supplied to the counterbore 13, and as shown in FIGS.
At the connection with the fuel cell 4, a perforated pipe 17 is provided as means for reducing the formation of a fuel liquid film, and the portion of the perforated pipe 17 is an opening facing the mixed fluid passage 14. When the steam S from the counterbore 13 is sent to the mixed fluid passage 14 through the perforated pipe portion 17, the steam S sent to the mixed fluid passage 14 is made uniform, the dead zone is reduced, and the fuel liquid film is removed. Formation is reduced.

The steam S and the liquid fuel F are supplied from a nozzle (not shown) to the atomizer 12, and the steam S is sent from the counterbore 13 to the mixed fluid passage 14 through the perforated pipe 17.
The liquid fuel F is sent from the groove 15 to the mixed fluid passage 14 through the fuel passage 16. As in the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 14, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 14a into the furnace.

Since the steam S from the counterbore 13 is sent to the mixed fluid passage 14 through the perforated pipe 17, the steam S sent to the mixed fluid passage 14 is made uniform and the dead zone is reduced. As a result, the location of the expanded steam colliding with the liquid fuel F increases. Therefore, the vapor S is sufficiently sent also to the vicinity of the wall surface, the spill of the liquid fuel F to the wall surface is suppressed, and the formation of the liquid film attached to the wall surface of the mixed fluid passage 14 is reduced, and the liquid film is thin. The liquid fuel F is atomized.

Thus, the atomization of the liquid fuel F is promoted by a simple structure in which the porous tube portion 17 is provided, and the atomization can be sufficiently atomized even if the liquid fuel F having a high viscosity is used.
Even if heavy oil or the like is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. Incidentally, it has been confirmed that the spray particle diameter can be reduced by about 10% to 15% as compared with the case where the liquid fuel is supplied from one fuel passage.

A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a front view of an atomizer according to a fourth embodiment of the present invention, and FIG. 10 is a longitudinal sectional view of FIG.

As shown in FIG. 10, the atomizer 18 comprises:
One surface (the right side in FIG. 10) is flat and the other (the left side in FIG. 10) has a truncated cone shape. One end of the atomizer 18 is connected to the tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

A counterbore 19 as a frustoconical atomizing fluid passage is formed at the center of one surface of the atomizer 18 on the side to which the vapor S and the liquid fuel F are sent. A plurality (six in the illustrated example) of mixed fluid passages 20 are provided radially toward the side inclined portion of the truncated cone on the surface. The opening 20a (that is, the tip of the mixed fluid passage 20) of the side inclined portion of the mixed fluid passage 20 faces a furnace (not shown).

The counterbore 19 on one side of the atomizer 18
A circumferential groove 21 is formed around the periphery of the mixed fluid passage 20, a fuel passage 22 is provided between the mixed fluid passage 20 and the groove 21, and an opening 22 a of the fuel passage 22 with respect to the mixed fluid passage 20 is formed in the mixed fluid passage 20. It is the opening of the fuel passage facing.

Steam S is supplied to the counterbore portion 19, and FIG.
As shown in FIG. 0, a threaded pipe portion 23 as a fuel liquid film formation reducing means is provided at a connection portion of the counterbore portion 19 with the mixed fluid passage 20.
Is formed on the inner periphery of the threaded tube portion 23, and a thread groove (turned inner peripheral surface portion) is formed on the inner periphery of the threaded tube portion 23, and the portion of the threaded tube portion 23 is an opening facing the mixed fluid passage 20. When the steam S from the counterbore portion 13 is sent to the mixed fluid passage 20 through the threaded pipe portion 23, a turning force is generated in the steam S and the steam S is spread.
Is sent as a swirling flow, and the formation of a fuel liquid film is reduced.

The steam S and the liquid fuel F are supplied from a nozzle (not shown) to the atomizer 18, the steam S is sent from the counterbore 19 through the screw pipe 23 to the mixed fluid passage 20, and the steam S from the groove 21 through the fuel passage 22. Thus, the liquid fuel F is sent to the mixed fluid passage 20. Similarly to the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 20, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 20a into the furnace.

Since the steam S from the counterbore portion 19 is sent to the mixed fluid passage 20 through the screw pipe 23, a swirling force is generated in the steam S, and the steam S is sent as a swirling flow with a spread. Can be Therefore, the vapor S is sufficiently sent also to the vicinity of the wall surface, the spill of the liquid fuel F to the wall surface is suppressed, and the formation of the liquid film adhered to the wall surface of the mixed fluid passage 20 is reduced, so that the liquid film is thin. The liquid fuel F is atomized.

Thus, the atomization of the liquid fuel F is promoted by a simple structure in which the screw tube portion 23 is provided, and the atomization can be sufficiently atomized even if the liquid fuel F having a high viscosity is used.
Even if heavy oil or the like is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. Incidentally, it has been confirmed that the spray particle size can be reduced by about 30% as compared with the case where the liquid fuel is supplied from one fuel passage.

A fifth embodiment of the present invention will be described with reference to FIG. FIG. 11 is a longitudinal sectional view of an atomizer according to a fifth embodiment of the present invention. The shape in a front view is the same as the state of FIG. 9 of the fourth embodiment.

As shown in FIG. 11, the atomizer 24
One surface (the right side in FIG. 11) is flat and the other (the left side in FIG. 11) has a truncated cone shape. One end of the atomizer 24 is connected to a tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

A counterbore 25 as a two-stage frustoconical atomizing fluid passage is formed at the center of one surface of the atomizer 18 on the side to which the vapor S and the liquid fuel F are sent.
A plurality (six in the illustrated example) of mixed fluid passages 26 are provided radially from the front end side inclined portion of the counterbore portion 25 to the side inclined portion of the truncated cone on the other surface. Counterbore part 2
The steam S is supplied to 5, and an opening 25 a of the mixed fluid passage 26 with respect to the counterbore 25 is an opening of the atomized fluid passage facing the mixed fluid passage 26. Also, the mixed fluid passage 26
The opening 26a (that is, the tip of the mixed fluid passage 26) of the side inclined portion faces the furnace (not shown).

The counterbore 25 on one side of the atomizer 24
A groove 27 having a circumferential shape is formed around the periphery of the mixed fluid passage 26. A fuel passage 28 is provided between the mixed fluid passage 26 and the groove 27, and an opening 28a of the fuel passage 28 with respect to the mixed fluid passage 26 defines the mixed fluid passage 26. It is the opening of the fuel passage facing.

From the rear inclined portion of the counterbore portion 25, the fuel passage 2
8 as a means for reducing fuel film formation
9 is provided, and the mixed fluid passage 26
Is supplied to the fuel passage 28.
A part of the vapor S is sent to the liquid fuel F in the middle of the fuel passage 28 to be converted into oil vapor (atomized), and the mixed fluid passage 26
In this case, the oil vapor and the main vapor from the counterbore 25 are mixed to further atomize the fuel, and the formation of a fuel liquid film is reduced.

Steam S and liquid fuel F are supplied from a nozzle (not shown) to the atomizer 24, and steam S is sent from the counterbore 25 to the mixed fluid passage 26, and from the groove 27 to the mixed fluid passage 26 through the fuel passage 28. Liquid fuel F is sent. As in the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 26, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 26a into the furnace.

Since a part of the steam S from the counterbore portion 25 is sent to the fuel passage 28 through the bypass passage 29, the steam S is supplied to the liquid fuel F at an intermediate portion of the fuel passage 28.
Is sent to be converted into oil vapor (atomized), and in the mixed fluid passage 26, the fuel vaporized oil vapor and the counterbore 2
5 is mixed with the main steam from 5 to further atomize the fuel. Therefore, the formation of the liquid film on the wall surface of the mixed fluid passage 26 is reduced, and the liquid fuel F is atomized in a state where the liquid film is thin.

Thus, the atomization of the liquid fuel F is promoted by a simple structure in which the bypass passage 29 is provided, and even if the liquid fuel F having a high viscosity is used, the atomization can be sufficiently atomized. Even if is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. Incidentally, it has been confirmed that the spray particle diameter can be reduced by about 50% to 55% as compared with the case where the liquid fuel is supplied from one fuel passage.

It is also possible to combine two or more fuel film formation reducing means in the first to fifth embodiments described above. That is, two or more types of using two fuel passages, providing the fuel passage and the atomizing fluid passage at the same angle, providing the perforated tube portion 17, providing the screw tube portion 23, and providing the bypass passage 29 are combined. A configuration is also possible.

A sixth embodiment of the present invention will be described with reference to FIG. FIG. 12 shows a longitudinal sectional view of an atomizer according to a sixth embodiment of the present invention. The shape in a front view is the same as the state of FIG. 9 of the fourth embodiment.

As shown in FIG. 12, the atomizer 30
One surface (the right side in FIG. 12) is a plane and the other (the left side in FIG. 12) has a truncated cone shape. One end of the atomizer 30 is connected to a tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

A counterbore 31 as a frustoconical atomizing fluid passage is formed at the center of one surface of the atomizer 30 on the side to which the vapor S and the liquid fuel F are sent, and A plurality of (six in the illustrated example) mixed fluid passages 32 are provided radially toward the side inclined portion of the truncated cone on the surface. Steam S is supplied to the counterbore 31, and an opening 31 a of the mixed fluid passage 32 with respect to the counterbore 31 is provided.
Is the opening of the atomizing fluid passage facing the mixed fluid passage 32. Also, the opening 32 of the side inclined portion of the mixed fluid passage 32
a (that is, the tip of the mixed fluid passage 32) faces a furnace (not shown).

The counterbore 31 on one side of the atomizer 30
A circumferential groove 33 is formed around the periphery of the fluid passage 32, a fuel passage 34 is provided between the mixed fluid passage 32 and the groove 33, and an opening 34a of the fuel passage 34 with respect to the mixed fluid passage 32 forms the mixed fluid passage 32. It is the opening of the fuel passage facing.

On the other hand, a swirl groove 35 is formed in the inner periphery of the mixed fluid passage 32 as a fuel film thickness reducing means.
As a result, a swirling flow is generated in the mixed fluid, and the time to reach the opening 32a is lengthened. Therefore, the turbulence of the mixed fluid and the opening 32
The fuel film thickness is reduced by extending the time to a.

The steam S and the liquid fuel F are supplied from a nozzle (not shown) to the atomizer 30, the steam S is sent from the counterbore 31 to the mixed fluid passage 32, and from the groove 33 to the mixed fluid passage 32 through the fuel passage 34. Liquid fuel F is sent. As in the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 32, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 32a into the furnace.

In the mixed fluid passage 32, a swirling flow is generated in the mixed fluid by the swirling groove 35, so that the time to reach the opening 32a is lengthened. For this reason, the turbulent flow of the mixed fluid and the extension of the arrival time to the opening 32a reduce the thickness of the fuel film, and the liquid fuel F is atomized in a thin liquid film state.

Thus, the swirl groove 3 is formed in the mixed fluid passage 32.
With the simple structure provided with 5, the atomization of the liquid fuel F is promoted, the atomization can be sufficiently atomized even when the liquid fuel F having a high viscosity is used, and the combustion efficiency is reduced even when using heavy oil or the like. And no reduction in exhaust gas performance. Incidentally, it has been confirmed that the spray particle diameter can be reduced by about 30% to 35% as compared with the case where the liquid fuel is supplied from one fuel passage.

The seventh embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. FIG. 13 is a front view of an atomizer according to a seventh embodiment of the present invention, and FIG. 14 is a longitudinal sectional view of FIG.

As shown in FIG. 14, the atomizer 36
One surface (the right side in FIG. 14) has a flat surface and the other (the left side in FIG. 14) has a truncated cone shape. One end of the atomizer 36 is connected to a tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

As shown in FIGS. 13 and 14, a counterbore 37 as a frustoconical atomizing fluid passage is provided at the center of one surface of the atomizer 36 on the side to which the steam S and the liquid fuel F are sent. A plurality (6 in the illustrated example) is formed from the spot facing portion 31 toward the side inclined portion of the truncated cone on the other surface.
) Mixed fluid passages 38 are provided radially. Steam S is supplied to the counterbore 37, and an opening 37 a of the mixed fluid passage 38 with respect to the counterbore 37 is an opening of the atomizing fluid passage facing the mixed fluid passage 38. Further, the opening 38a of the inclined side surface of the mixed fluid passage 38 (that is, the mixed fluid passage 3
8) faces a furnace not shown.

The counterbore 37 on one side of the atomizer 36
A groove 39 having a circular shape is formed around the periphery of the fuel passage 40. A fuel passage 40 is provided between the mixed fluid passage 38 and the groove 39, and an opening 40a of the fuel passage 40 with respect to the mixed fluid passage 38 forms the mixed fluid passage 38. It is the opening of the fuel passage facing.

On the other hand, the mixed fluid passage 3
A second atomizing fluid passage 41 is provided as a fuel film thickness reducing means for connecting the fuel cell 8 and the counterbore portion 37. An opening 41a (second opening) of the second atomizing fluid passage 41 with respect to the mixed fluid passage 38 is provided with a fuel. It is on the downstream side of the opening 40a of the passage 40. Part of the steam S is supplied to the mixed fluid passage 38 from the second atomizing fluid passage 41 to the downstream side of the mixed fluid. Therefore, a part of the steam S is blown into the liquid film on the wall surface of the mixed fluid passage 38, and the fuel film thickness is reduced.

The steam S and the liquid fuel F are supplied from a nozzle (not shown) to the atomizer 36, the steam S is sent from the counterbore 37 to the mixed fluid passage 38, and from the groove 39 to the mixed fluid passage 38 through the fuel passage 34. Liquid fuel F is sent. As in the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 38, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 38a into the furnace.

A part of the steam S is supplied to the mixed fluid passage 38 from the second atomizing fluid passage 41 to the downstream side of the mixed fluid.
Part of the vapor S is blown into the liquid film on the wall surface of the mixed fluid passage 38. Therefore, the fuel film thickness on the wall is reduced,
The liquid fuel F is atomized while the liquid film is thin.

Thus, the atomization of the liquid fuel F is promoted by a simple structure in which the second atomizing fluid passage 41 is provided, and the atomization can be sufficiently atomized even when the liquid fuel F having a high viscosity is used. Even if heavy oil or the like is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. By the way, 1
Compared to the case where liquid fuel is supplied from the book fuel passage,
It has been confirmed that the spray particle size could be reduced by about 20%.

It is also possible to adopt a configuration in which the fuel film thickness reducing means of the sixth embodiment and the seventh embodiment are combined. That is, it is also possible to provide the swirl groove 35 on the inner periphery of the mixed fluid passage 32 and the second atomized fluid passage 41 as a fuel film thickness reducing means.

The eighth embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. FIG. 15 is a front view of the atomizer according to the eighth embodiment of the present invention, and FIG. 16 is a vertical sectional view of FIG.

As shown in FIG. 16, the atomizer 42
One surface (the right side in FIG. 16) is flat and the other (the left side in FIG. 16) has a truncated cone shape. One end of the atomizer 42 is connected to the tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

As shown in FIGS. 15 and 16, a counterbore 43 as a frustoconical atomizing fluid passage is provided at the center of one surface of the atomizer 42 on the side to which the steam S and the liquid fuel F are sent. A plurality (6 in the illustrated example) is formed from the counterbore 43 toward the side inclined portion of the truncated cone on the other surface.
) Mixed fluid passages 44 are provided radially. Steam S is supplied to the counterbore 43, and an opening 43 a of the mixed fluid passage 44 with respect to the counterbore 43 is an opening of the atomizing fluid passage facing the mixed fluid passage 44. The opening 44a of the inclined side surface of the mixed fluid passage 44 (that is, the mixed fluid passage 4
4) faces a furnace not shown.

The counterbore 43 on one side of the atomizer 42
A circumferential groove 45 is formed around the periphery of the fluid passage 44, a fuel passage 46 is provided between the mixed fluid passage 44 and the groove 45, and an opening 46 a of the fuel passage 46 with respect to the mixed fluid passage 44 defines the mixed fluid passage 44. It is the opening of the fuel passage facing.

The mixed fluid passage 44 has an opening 44 which is an ejection port.
The diameter is gradually increased toward a (fuel atomization promoting means), and the wet edge length is increased. That is,
The mixed fluid passage 44 has a diameter D of the opening 44a with respect to the diameter d of the base.
Is getting bigger. For this reason, the edge portion where the liquid film is torn off becomes long, and atomization of the fuel is promoted. Further, since the area of the inner peripheral surface of the mixed fluid passage 44, that is, the area to which the liquid film adheres, increases toward the opening 44a, the thickness of the liquid film is reduced.

Steam S and liquid fuel F are supplied from a nozzle (not shown) to the atomizer 42, steam S is sent from the counterbore 43 to the mixed fluid passage 44, and from the groove 45 through the fuel passage 46 to the mixed fluid passage 44. Liquid fuel F is sent. As in the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 44, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 44a into the furnace.

Since the mixed fluid passage 44 is configured so that the diameter gradually increases toward the opening 44a and the wet edge length is increased, the edge portion where the liquid film is torn becomes longer, and the atomization of the fuel is promoted. Is done. Also, the mixed fluid passage 4
Since the area where the liquid film of No. 4 adheres increases toward the opening 44a, the thickness of the liquid film is reduced. For this reason, atomization of the fuel is promoted, the thickness of the fuel on the wall surface is reduced, and the liquid fuel F is atomized in a state where the liquid film is thin.

Thus, the atomization of the liquid fuel F is promoted by a simple configuration in which the diameter of the mixed fluid passage 44 is gradually increased toward the injection port, and the atomization of the liquid fuel F is promoted even if the liquid fuel F having a high viscosity is used. Even if heavy oil or the like is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. Incidentally, it has been confirmed that the spray particle size can be reduced by about 30% as compared with the case where the liquid fuel is supplied from one fuel passage.

A ninth embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. FIG. 17 is a front view of the atomizer according to the ninth embodiment of the present invention, FIG. 18 is a longitudinal sectional view in FIG. 17, and FIG. 19 is a view along line XIX-XIX in FIG.

As shown in FIG. 18, the atomizer 47
One surface (the right side in FIG. 18) is a plane and the other (the left side in FIG. 18) has a truncated cone shape. One end of the atomizer 47 is connected to a tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

As shown in FIGS. 17 to 19, a counterbore 48 as a frustoconical atomizing fluid passage is provided at the center of one surface of the atomizer 47 on the side to which the steam S and the liquid fuel F are sent. From the counterbore portion 48 toward the side inclined portion of the truncated cone on the other surface (6 in the illustrated example).
) Of the mixed fluid passages 49 are provided radially. Steam S is supplied to the counterbore 48, and an opening 48 a of the mixed fluid passage 49 with respect to the counterbore 48 is an opening of the atomizing fluid passage facing the mixed fluid passage 49. The opening 49a of the inclined side surface of the mixed fluid passage 49 (that is, the mixed fluid passage 4)
9) faces a furnace not shown.

Counterbore 48 on one side of atomizer 47
A circumferential groove 50 is formed around the periphery of the fluid passage 49, a fuel passage 51 is provided between the mixed fluid passage 49 and the groove 50, and an opening 51 a of the fuel passage 51 with respect to the mixed fluid passage 49 is formed with the mixed fluid passage 49. It is the opening of the fuel passage facing.

At the center of the mixed fluid passage 49, there is provided a screw rod 52 (fuel atomization promoting means) as a rod material extending in the longitudinal direction of the passage and having a threaded groove formed on the outer periphery. 52 is a stopper member 5 that straddles the opening 48a at the opening 48a.
By fixing 3, it is arranged at the center of the mixed fluid passage 49. An edge portion (wet edge) where the liquid film is torn off is formed on the surface of the screw rod 52, and the atomization of the fuel is promoted. In addition, since the mixed fluid is generated and sent by the screw rod 52, a turbulent flow of the mixed fluid is promoted, and the formation of the fuel liquid film is reduced.

Steam S and liquid fuel F are supplied from a nozzle (not shown) to the atomizer 47, and steam S is sent from the counterbore 48 to the mixed fluid passage 49, and from the groove 50 to the mixed fluid passage 49 through the fuel passage 51. Liquid fuel F is sent. As in the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 49, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 49a into the furnace.

The screw rod 5 is located at the center of the mixed fluid passage 49.
2, the wetted edge length is increased, so that the edge portion where the liquid film is torn is lengthened, and the atomization of the fuel is promoted. Further, the turbulent flow of the mixed fluid is promoted by the screw rod 52, and the formation of the fuel liquid film is reduced,
The liquid fuel F is atomized while the liquid film is thin.

Thus, the atomization of the liquid fuel F is promoted by a simple structure in which the screw rod 52 is disposed at the center of the mixed fluid passage 49, and the atomization is sufficiently performed even when the liquid fuel F having a high viscosity is used. Even if heavy oil or the like is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. Incidentally, it has been confirmed that the spray particle diameter can be reduced by about 10% as compared with the case where the liquid fuel is supplied from one fuel passage.

It is also possible to adopt a configuration in which the fuel atomization promoting means of the eighth embodiment and the ninth embodiment are combined. That is, the mixed fluid passage 44 may be configured so as to gradually increase in diameter toward the opening 44a, and the screw rod 52 may be disposed at the center of the mixed fluid passage 44 to serve as fuel atomization promoting means. .

The first embodiment of the present invention will be described with reference to FIGS.
An example of the embodiment will be described. FIG. 20 is a front view of the atomizer according to the tenth embodiment of the present invention, and FIG.
FIG. 22 is a vertical sectional view, and FIG. 22 is a view taken along line XXII-XXII in FIG.

As shown in FIG. 21, the atomizer 54
One surface (the right side in FIG. 21) has a flat surface and the other (the left side in FIG. 21) has a truncated cone shape. One end of the atomizer 54 is connected to a tip of a nozzle (not shown) through which steam S as an atomizing fluid and liquid fuel F as a fuel are sent.

As shown in FIGS. 20 to 22, a counterbore 55 as a frusto-conical atomizing fluid passage is provided at the center of one surface of the atomizer 54 on the side to which the steam S and the liquid fuel F are sent. A plurality (6 in the illustrated example) is formed from the counterbore 55 toward the side inclined portion of the truncated cone on the other surface.
) Of the mixed fluid passages 56 are provided radially. Steam S is supplied to the counterbore 55, and an opening 55 a of the mixed fluid passage 56 with respect to the counterbore 55 is an opening of the atomized fluid passage facing the mixed fluid passage 56. Further, the opening 56a of the inclined side surface of the mixed fluid passage 56 (that is, the mixed fluid passage 5
6) faces a furnace (not shown).

A counterbore 55 on one side of the atomizer 54
A circumferential groove 57 is formed around the periphery of the fuel passage 58, a fuel passage 58 is provided between the mixed fluid passage 56 and the groove 57, and an opening 58a of the fuel passage 58 with respect to the mixed fluid passage 56 defines the mixed fluid passage 56. It is an opening of the fuel passage facing. FIG.
As shown in FIG. 2, the fuel passage 58 is disposed in a direction eccentric from the center of the mixed fluid passage 56, that is, the mixed fluid passage 5
6 are arranged to extend tangentially to the cross section of
An opening 58a is positioned so as to swirl the fuel inside 6 (fuel particle size uniforming means). By swirling the fuel, a uniform liquid film is formed in the mixed fluid passage 56, and a spray having a uniform particle size can be obtained.

As shown by the dotted line in FIG. 22, a plurality of fuel passages 58 can be arranged in a direction eccentric from the center of the mixed fluid passage 56. By providing a plurality of fuel passages 58, Due to the collision between fuels, a spray having a uniform particle diameter and a small diameter can be obtained.

Steam S and liquid fuel F are supplied from a nozzle (not shown) to the atomizer 54, steam S is sent from the counterbore portion 55 to the mixed fluid passage 56, and from the groove portion 57 through the fuel passage 58 to the mixed fluid passage 56. The liquid fuel F is sent. As in the first embodiment, the liquid fuel F becomes the atomized mixed fluid in the mixed fluid passage 56, and the atomized mixed fluid of the liquid fuel F is ejected from the opening 49a into the furnace.

Since the fuel passage 58 is disposed in a direction eccentric from the center of the mixed fluid passage 56, and the fuel is swirled inside the mixed fluid passage 56, a uniform liquid film is formed in the mixed fluid passage 56. Once formed, a spray of uniform particle size can be obtained.

Thus, the atomization of the liquid fuel F is promoted by a simple structure in which the fuel passage 58 is disposed eccentrically from the center of the mixed fluid passage 56, so that even if the liquid fuel F having a high viscosity is used, sufficient spraying can be achieved. Even if heavy oil or the like is used, the combustion efficiency does not decrease and the exhaust gas performance does not decrease. Incidentally, it has been confirmed that the spray particle diameter can be reduced by about 10% to 15% as compared with the case where the liquid fuel is supplied from one fuel passage.

The atomizer of the present invention includes the first
The fuel film formation reducing means of the embodiment examples to the fifth embodiment, the fuel film thickness reducing means of the sixth and seventh embodiments, and the fuel fine particles of the eighth and ninth embodiments. It is also possible to adopt a configuration provided with at least two or more of the gasification promoting means and the fuel particle size uniformizing means of the tenth embodiment.

[0098]

According to the atomizer of the present invention, in an atomizer in which an atomizing fluid passage and a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at an end thereof, the inner periphery of the mixed fluid passage is provided. Since the fuel film formation reducing means for preventing the formation of the fuel film on the mixed fluid passage is provided, the formation of the fuel film in the mixed fluid passage is reduced, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

The fuel film formation reducing means makes the plurality of fuel passage openings face the mixed fluid passage so as to increase the expansion force of the atomized fluid inside the mixed fluid passage and cause the fuel to collide with each other. Therefore, the formation of the fuel film in the mixed fluid passage is reduced by the expansion pressure of the atomizing fluid and the collision of the fuels, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

In the fuel film formation reducing means, the atomizing fluid passage and the fuel passage extend at a symmetrical angle with respect to the mixed fluid passage so that the openings of the atomizing fluid passage and the fuel passage face the mixed fluid passage. However, since the collision between the atomized fluid and the fuel is promoted inside the mixed fluid passage, the formation of the fuel film in the mixed fluid passage by the collision with the atomized fluid is reduced, and Atomization is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

Further, the fuel film formation reducing means is configured so that the atomizing fluid passage faces the mixing fluid passage via the porous tube so that the atomizing fluid is uniform inside the mixing fluid passage. Therefore, the dead zone of the atomized fluid is reduced, the formation of the fuel film is reduced, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

Further, the fuel film formation reducing means causes the atomizing fluid passage to face the mixed fluid passage via the swirling groove-shaped inner peripheral surface portion to generate a swirling flow in the atomized fluid inside the mixed fluid passage. Therefore, the formation of the fuel film is reduced by the swirling flow, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

The fuel film formation reducing means is provided with a bypass which connects the atomized fluid passage and the fuel passage, mixes a part of the atomized fluid inside the fuel passage, and mixes the atomized fuel. Since it is configured to be introduced into the fluid passage, the formation of the fuel film is reduced, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

An atomizer according to the present invention is an atomizer in which an atomizing fluid passage and a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at an end thereof, respectively, in an inner periphery of the mixed fluid passage. Since the fuel film thickness reducing means for reducing the thickness of the fuel film to be formed is provided, the film thickness of the fuel film in the mixed fluid passage is reduced, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

The fuel film thickness reducing means is configured to form a swirl groove in the inner periphery of the mixed fluid passage to promote the turbulent flow of the mixed fluid. The film thickness is reduced, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

Further, the fuel film thickness reducing means is configured to face the second opening of the atomizing fluid passage to the atomizing fluid passage and the mixed fluid passage on the downstream side of the opening of the fuel passage so that the atomizing fluid is directed toward the fuel film. Is injected, the injection of the atomizing fluid into the fuel film reduces the thickness of the fuel film and promotes atomization of the liquid fuel. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

The atomizer according to the present invention is an atomizer in which an atomizing fluid passage and an opening of a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at a tip thereof, respectively. Since the fuel atomization accelerating means for atomizing the fuel particles is provided, the fuel particles are atomized and the atomization of the liquid fuel is accelerated. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

The fuel atomization accelerating means is configured to gradually increase the diameter of the mixed fluid passage toward the jet port and increase the wet edge length of the jet port. The atomization portion of the liquid fuel is increased, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

Further, the fuel atomization promoting means is provided with a rod extending in the longitudinal direction of the passage at the center of the mixed fluid passage and having a thread-shaped groove formed on the outer periphery, so that the outer peripheral surface of the rod is a wet edge. With such a configuration, the number of parts where the fuel particles are refined is increased, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

Further, since the rod has a function of promoting the turbulent flow of the mixed fluid by the thread-shaped groove and reducing the thickness of the fuel film formed on the inner periphery of the mixed fluid passage, further fuel Grain refinement becomes possible.

An atomizer according to the present invention is an atomizer in which an atomizing fluid passage and an opening of a fuel passage are respectively provided in a mixed fluid passage having an ejection outlet for ejecting a mixed fluid at a tip thereof, and the ejection is performed from the ejection outlet of the mixed fluid passage. Since the fuel particle size equalizing means for equalizing the fuel particles to be formed is provided, the atomization of the liquid fuel is promoted by the uniform fuel particles. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

The fuel particle size equalizing means arranges the fuel passage in a direction eccentric from the center of the mixed fluid passage so that the fuel passage faces the mixed fluid passage and swirls the fuel inside the mixed fluid passage. Therefore, the turning of the fuel makes the fuel particles uniform, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

Further, the fuel particle size equalizing means arranges a plurality of fuel passages in a direction eccentric from the center of the mixed fluid passage, exposes the plurality of fuel passages to the mixed fluid passage, and supplies the fuel inside the mixed fluid passage. Since the fuel is swirled, the fuel is made uniform by the fuel swirling and the collision between the fuels, and the atomization of the liquid fuel is promoted. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

The atomizer according to the present invention is an atomizer in which an atomizing fluid passage and a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at a tip thereof, respectively. Means for reducing the formation of a fuel film, means for reducing the formation of a fuel film, means for reducing the thickness of the fuel film formed on the inner periphery of the mixed fluid passage, means for reducing the thickness of the fuel particles ejected from the outlet of the mixed fluid passage. A fuel atomization accelerating means, and a fuel particle size equalizing means for equalizing the fuel particles ejected from the ejection port of the mixed fluid passage. The atomization of the liquid fuel is promoted by any two or more of the reduction of the fuel film thickness, the promotion of the fuel refinement, and the uniformization of the fuel particles. As a result, it is possible to sufficiently atomize the spray without increasing the cost regardless of the properties of the liquid fuel.

[Brief description of the drawings]

FIG. 1 is a front view of an atomizer according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view in FIG.

FIG. 3 is a view taken along the line III-III in FIG. 2;

FIG. 4 is a front view of an atomizer according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view in FIG. 4;

FIG. 6 is a front view of an atomizer according to a third embodiment of the present invention.

FIG. 7 is a longitudinal sectional view in FIG. 6;

FIG. 8 is a view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a front view of an atomizer according to a fourth embodiment of the present invention.

FIG. 10 is a longitudinal sectional view in FIG. 9;

FIG. 11 is a longitudinal sectional view of an atomizer according to a fifth embodiment of the present invention.

FIG. 12 is a longitudinal sectional view of an atomizer according to a sixth embodiment of the present invention.

FIG. 13 is a front view of an atomizer according to a seventh embodiment of the present invention.

FIG. 14 is a longitudinal sectional view in FIG.

FIG. 15 is a front view of an atomizer according to an eighth embodiment of the present invention.

FIG. 16 is a longitudinal sectional view in FIG.

FIG. 17 is a front view of an atomizer according to a ninth embodiment of the present invention.

FIG. 18 is a longitudinal sectional view in FIG. 17;

FIG. 19 is a view taken along the line XIX-XIX in FIG. 18;

FIG. 20 is a front view of an atomizer according to a tenth embodiment of the present invention.

FIG. 21 is a longitudinal sectional view in FIG. 20;

FIG. 22 is a view taken along line XXII-XXII in FIG. 21;

[Explanation of symbols]

1, 6, 12, 18, 24, 30, 36, 42, 47,
54 Atomizer 2,7,13,19,25,31,37,43,48,
55 Counterbore parts 3, 8, 14, 20, 26, 32, 38, 44, 49,
56 Mixed fluid passage 4,10,15,21,27,33,39,45,5
0,57 Grooves 5, 11, 16, 22, 28, 34, 40, 46, 5
1,58 fuel passage 9 atomization fluid passage 17 perforated pipe part 29 bypass passage 35 swirl groove 41 second atomization fluid passage 52 screw rod 53 stop member

Continued on the front page (72) Inventor Toshimitsu Ichinose 5-717-1, Fukahori-cho, Nagasaki City, Nagasaki Prefecture Inside Nagasaki Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Hiroki Yamaguchi 1-1-1, Akunouracho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries 3K056 AA08 AB04 AB05 AC03 AD01 CA02 CA12 CB07

Claims (17)

[Claims] 1. An atomizer in which an atomizing fluid passage and an opening of a fuel passage are provided to face a mixed fluid passage having an ejection port for ejecting a mixed fluid at an end thereof, and a fuel film is formed on an inner periphery of the mixed fluid passage. An atomizer comprising a fuel film formation reducing means for preventing the formation of a fuel film. 2. The fuel film formation reducing means according to claim 1, wherein a plurality of openings of the fuel passage are made to face the mixed fluid passage so that the expansion force of the atomized fluid is relatively increased and the fuel is formed inside the mixed fluid passage. An atomizer characterized in that it is configured to collide with each other. 3. The fuel film formation reducing means according to claim 1, wherein the atomizing fluid passage and the fuel passage extend at a symmetrical angle with respect to the mixed fluid passage, and the openings of the atomizing fluid passage and the fuel passage are formed. An atomizer configured to face a mixed fluid passage and to promote collision between an atomized fluid and a fuel inside the mixed fluid passage. 4. The fuel film formation reducing means according to claim 1, wherein the atomizing fluid passage faces the atomizing fluid passage through the perforated pipe with respect to the mixed fluid passage so that the atomized fluid becomes uniform inside the mixed fluid passage. An atomizer characterized in that it is configured as follows. 5. The fuel film formation reducing means according to claim 1, wherein the atomization fluid passage faces the atomization fluid passage through the swirling groove-shaped inner peripheral surface portion with respect to the mixture fluid passage, and the atomization fluid is swirled inside the mixture fluid passage. An atomizer configured to generate a flow. 6. The fuel film formation reducing device according to claim 1, wherein the fuel film formation reducing means includes a bypass passage communicating the atomizing fluid passage with the fuel passage, and mixing a part of the atomizing fluid inside the fuel passage.
An atomizer configured to charge atomized fuel into a mixed fluid passage. 7. A fuel film formed on an inner periphery of a mixed fluid passage in an atomizer in which an atomizing fluid passage and an opening of a fuel passage are provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at a tip end. An atomizer comprising a fuel film thickness reducing means for reducing the film thickness of the fuel cell. 8. The atomizer according to claim 7, wherein the fuel film thickness reducing means is configured to form a swirl groove in an inner periphery of the mixed fluid passage to promote a turbulent flow of the mixed fluid. . 9. The fuel film according to claim 7, wherein the fuel film thickness reducing means faces the second opening of the atomizing fluid passage to the mixed fluid passage on the downstream side of the opening of the atomizing fluid passage and the fuel passage. An atomizer configured to input a nebulized fluid toward the atomizer. 10. An atomizer in which an atomizing fluid passage and an opening of a fuel passage are respectively provided in a mixed fluid passage having an ejection outlet for ejecting a mixed fluid at a tip thereof, wherein fuel particles ejected from the ejection outlet of the mixed fluid passage are provided. An atomizer comprising fuel atomization accelerating means for atomization. 11. The fuel atomization accelerating means according to claim 10, wherein the mixed fluid passage is configured to gradually increase in diameter toward the jet port to increase the wet edge length of the jet port. Atomizer to do. 12. The fuel atomization promoting means according to claim 10, wherein the fuel atomization promoting means is provided with a bar extending in the longitudinal direction of the mixed fluid passage and having a threaded groove formed on the outer periphery thereof. An atomizer characterized in that the surface is configured to have a wet edge. 13. The rod material according to claim 12, wherein the rod material has a function of promoting a turbulent flow of the mixed fluid in the screw-shaped groove to reduce the thickness of the fuel film formed on the inner periphery of the mixed fluid passage. An atomizer characterized in that: 14. An atomizer in which an atomizing fluid passage and an opening of a fuel passage are respectively provided in a mixed fluid passage having an ejection outlet for ejecting a mixed fluid at a tip thereof, wherein fuel particles ejected from the ejection outlet of the mixed fluid passage are provided. An atomizer comprising a fuel particle size uniformizing means for uniformizing. 15. The mixed fluid passage according to claim 14, wherein the fuel particle size equalizing means arranges the fuel passage in a direction eccentric from the center of the mixed fluid passage so that the fuel passage faces the mixed fluid passage. An atomizer configured to swirl fuel. 16. The mixed fluid passage according to claim 14, wherein the fuel particle size equalizing means includes a plurality of fuel passages arranged in a direction eccentric from the center of the mixed fluid passage so that the plurality of fuel passages face the mixed fluid passage. An atomizer configured to swirl fuel inside the interior of the atomizer. 17. An atomizer in which an atomizing fluid passage and an opening of a fuel passage are respectively provided in a mixed fluid passage having an ejection port for ejecting a mixed fluid at an end thereof, and a fuel film is formed on an inner periphery of the mixed fluid passage. Means for preventing fuel film formation, fuel film thickness reducing means for reducing the thickness of the fuel film formed on the inner periphery of the mixed fluid passage, and fuel fine particles for miniaturizing fuel particles ejected from the ejection port of the mixed fluid passage Means for promoting
An atomizer, comprising: at least two or more of fuel particle size equalizing means for equalizing fuel particles ejected from an ejection port of a mixed fluid passage.