Fuel spray nozzle

Abstract

A fuel spray nozzle provided with: a liquid fuel channel (15), which is a channel for liquid fuel; a liquid fuel injection hole (19), which is a hole for communicating the liquid fuel channel (15) and the inside of a combustion burner, and injecting the liquid fuel into the combustion burner; an additive channel (14), which is a channel for an additive; and an additive injection hole (18a), which is a hole for communicating the additive channel (14) and the inside of the combustion burner, and injecting the additive into the combustion burner at an angle at which the additive collides with the liquid fuel injected from the liquid fuel injection hole (19).

Claims

1. A fuel spray nozzle for spraying liquid fuel and an additive inside a combustion burner of a gas turbine, the fuel spray nozzle comprising: a liquid fuel channel for the liquid fuel; a liquid fuel injection hole configured to allow the liquid fuel channel and an inside of the combustion burner to communicate, and to inject the liquid fuel into the combustion burner; an additive channel for the additive; an additive injection hole configured to allow the additive channel and the inside of the combustion burner to communicate, and to inject the additive into the combustion burner at an angle at which the additive collides with the liquid fuel injected from the liquid fuel injection hole; and a liquid fuel pressure equalization space provided between the liquid fuel channel and the liquid fuel injection hole, the liquid fuel pressure equalization space having a capacity to equalize a pressure of the liquid fuel that has flowed from the liquid fuel channel; and an additive pressure equalization space provided between the additive channel and the additive injection hole, the additive pressure equalization space having a capacity to equalize a pressure of the additive that has flowed from the additive channel, a swirl vane disposed upstream of the additive injection hole, wherein the swirl vane is increasingly curved from upstream to downstream, so that air inside the combustion burner is caused to swirl; wherein the additive injection hole and liquid fuel injection hole are aligned along a longitudinal axis of the fuel spray nozzle and are provided in a side surface of the fuel spray nozzle, and wherein at least one of the liquid fuel injection hold and the additive injection hole is formed as a slit, and the slit has a tapered shape; wherein the liquid fuel injection hole and the additive injection hole are arranged in directions so that the liquid fuel injected from the liquid fuel injection hole and the additive injected from the additive injection hole respectively inject the liquid fuel and the additive obliquely relative to each other and the liquid fuel injected from the liquid fuel injection hole and the additive injected from the additive injection hole converge so as to collide with each other to thereby spray the liquid fuel and the additive.

2. The fuel spray nozzle according to claim 1, wherein the additive injection hole is disposed upstream of the liquid fuel injection hole.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic cross-sectional view illustrating a fuel spray nozzle according to a first embodiment of the present invention.

(2) FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1.

(3) FIG. 3 is an enlarged view of a section E in FIG. 1.

(4) FIG. 4 is a view seen in the direction of arrows B-B in FIG. 3.

(5) FIG. 5 is a schematic view in which a part of a fuel spray nozzle according to a second embodiment of the present invention is enlarged.

(6) FIG. 6 is a view seen in the direction of arrows C-C in FIG. 5.

(7) FIG. 7 is a schematic view in which a part of a fuel spray nozzle according to a third embodiment of the present invention is enlarged.

(8) FIG. 8 is a view seen in the direction of arrows D-D in FIG. 7.

(9) FIG. 9 is a schematic arrow view illustrating an example of an interior of a conventional air-blast type combustion burner.

(10) FIG. 10 is a schematic view illustrating an example of a conventional nozzle tip type combustion burner.

DETAILED DESCRIPTION OF EMBODIMENTS

(11) Hereinafter, embodiments of a fuel spray nozzle according to the present invention will be described with reference to the drawings.

First Embodiment

(12) A fuel spray nozzle according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view illustrating a fuel spray nozzle according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along a line A-A in FIG. 1. FIG. 3 is an enlarged view of a section E in FIG. 1. FIG. 4 is a view seen in the direction of arrows B-B in FIG. 3. Furthermore, dashed line arrows in FIG. 1 and FIG. 3 indicate the flow of additive and long-dashed short-dashed line arrows indicate the flow of liquid fuel.

(13) A fuel spray nozzle 11a sprays liquid fuel and an additive inside a combustion burner (not illustrated) of a gas turbine. As illustrated in FIGS. 1 to 4, the fuel spray nozzle 11a is provided with a swirl vane 12, an additive channel 14, a liquid fuel channel 15, an additive pressure equalization space 16, a liquid fuel pressure equalization space 17, a first additive injection hole 18a and a liquid fuel injection hole 19.

(14) As illustrated in FIGS. 1 to 3, the liquid fuel channel 15 is a channel for the liquid fuel provided inside the fuel spray nozzle 11a.

(15) As illustrated in FIGS. 1 to 3, the additive channel 14 is a channel for the additive provided on the periphery of the liquid fuel channel 15.

(16) As illustrated in FIG. 3, the liquid fuel pressure equalization space 17 is a space that is provided at an end portion of the liquid fuel channel 15, specifically, between the liquid fuel channel 15 and the liquid fuel injection hole 19, and that has the capacity to equalize the pressure of the liquid fuel that has flowed from the liquid fuel channel 15.

(17) As illustrated in FIGS. 3 and 4, the liquid fuel injection hole 19 is a hole configured to allow the liquid fuel pressure equalization space 17 and the inside of the combustion burner (the outside of the fuel spray nozzle 11a) to communicate and to inject the liquid fuel into the combustion burner.

(18) In FIG. 4, eight of the liquid fuel injection holes 19 are illustrated, but the present embodiment is not limited thereto, and there may be any number of the liquid fuel injection holes 19, as long as there is one or more. Even when there is a plurality of the liquid fuel injection holes 19, as the pressure of the liquid fuel is equalized in the liquid fuel pressure equalization space 17; it is possible to uniformly inject the liquid fuel from each of the holes.

(19) As illustrated in FIG. 3, the additive pressure equalization space 16 is a space that is provided at an end portion of the additive channel 14, specifically, between the additive channel 14 and the first additive injection hole 18a, and that has the capacity to equalize the pressure of the additive that has flowed from the additive channel 14.

(20) As illustrated in FIGS. 3 and 4, the first additive injection hole 18a is a hole configured to allow the additive pressure equalization space 16 and the inside of the combustion burner to communicate, and to inject the additive into the combustion burner at an angle at which the additive collides with the liquid fuel injected from the liquid fuel injection hole 19.

(21) In FIG. 4, eight of the first additive injection holes 18a are illustrated, but the present embodiment is not limited thereto, and there may be any number of the first additive injection holes 18a, as long as there is one or more. Even when there is a plurality of the first additive injection holes 18a, as the pressure of the additive is equalized in the additive pressure equalization space 16, it is possible to uniformly inject the additive from each of the holes.

(22) As the fuel spray nozzle according to the first embodiment of the present invention is configured such as that described above, the liquid fuel injected from the liquid fuel injection hole 19 and the additive injected from the additive injection holes 18a are caused to collide and it is thus possible to spray the liquid fuel and the additive. In this manner, the mixing of the liquid fuel and the additive is accelerated and it is possible to reduce NOx.

(23) In addition, the swirl vane 12 is a vane that is increasingly curved from upstream to downstream, so that it causes air inside the combustion burner to swirl. As illustrated in FIGS. 1, 3 and 4, by providing the swirl vane 12, it is possible to generate a vortex and further accelerate the mixing of the liquid fuel and the additive after the collision of the liquid fuel and the additive. It is also possible to further accelerate the mixing of air.

(24) Note that, in the fuel spray nozzle according to the first embodiment of the present invention, it is also possible for the injection holes 18a and 19, without the pressure equalization spaces 16 and 17, to allow the respective channels 14 and 15 and the inside of the combustion burner to directly communicate. Furthermore, spraying that is suitable for combustion can be performed by changing an injection angle of each of the injection holes 18a and 19.

(25) Furthermore, although in the above description, the additive channel 14 is provided on the periphery of the liquid fuel channel 15, the present embodiment is not limited thereto, and the positions of the liquid fuel channel 15 and the additive channel 14 may be switched, for example. In addition, the channels 14 and 15 may be arranged so that they are separated from each other. Then, in the above description, each of the channels 14 and 15 is provided in the interior of the fuel spray nozzle 11a, but the present embodiment is not limited thereto, and the additive channel 14 may be arranged inside the swirl vane 12, for example. In this case, the additive pressure equalization space 16 that communicates with the additive 14 and the first additive injection hole 18a are also arranged inside the swirl vane 12.

(26) The fuel spray nozzle according to the first embodiment of the present invention has been described above. Specifically, the fuel spray nozzle according to the first embodiment of the present invention is the fuel spray nozzle 11a that sprays the liquid fuel and the additive inside the combustion burner of the gas turbine. The fuel spray nozzle 11a is provided with the liquid fuel channel 15 for the liquid fuel, the liquid fuel injection hole 19 that is configured to allow the liquid fuel channel 15 and the inside of the combustion burner to communicate and to inject the liquid fuel into the combustion burner, the additive channel 14 for the additive, and the additive injection hole 18a that is configured to allow the additive channel 14 and the inside of the combustion burner to communicate, and to inject the additive into the combustion burner at the angle at which the additive collides with the liquid fuel injected from the liquid fuel injection hole 19.

(27) Furthermore, the fuel spray nozzle 11a may be further provided with the liquid fuel pressure equalization space 17, which is provided between the liquid fuel channel 15 and the liquid fuel injection hole 19 and which has the capacity to equalize the pressure of the liquid fuel that has flowed from the liquid fuel channel 15, and the additive pressure equalization space 16, which is provided between the additive channel 14 and the additive injection hole 18a and which has the capacity to equalize the pressure of the additive that has flowed from the additive channel 14.

(28) Furthermore, the fuel spray nozzle 11a may be further provided with the swirl vane 12 that is increasingly curved from upstream to downstream, so that it causes air inside the combustion burner to swirl.

(29) As described above, with the fuel spray nozzle according to the first embodiment of the present invention, an air blast, a nozzle tip, or the like is not necessary and therefore NOx reduction can be accomplished at low cost.

Second Embodiment

(30) A fuel spray nozzle according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a schematic view in which a part of the fuel spray nozzle according to the second embodiment of the present invention is enlarged. FIG. 6 is a view seen in the direction of arrows C-C in FIG. 5. Furthermore, the long-dashed short-dashed line arrow in FIG. 5 indicates the flow of liquid fuel, and a dotted area indicates an injected additive.

(31) As illustrated in FIGS. 5 and 6, a fuel spray nozzle 11b is provided with the swirl vane 12, a second additive injection hole 18b, the liquid fuel injection hole 19, the additive channel (not illustrated), the liquid fuel channel (not illustrated), the additive pressure equalization space (not illustrated), and the liquid fuel pressure equalization space (not illustrated). Note that the swirl vane 12, the liquid fuel injection hole 19, the additive channel, the liquid fuel channel, the additive pressure equalization space, and the liquid fuel pressure equalization space are similar as those of the first embodiment, and a description thereof is omitted here.

(32) The second additive injection hole 18b is formed by forming the first additive injection hole 18a of the first embodiment as a slit, as illustrated in FIGS. 5 and 6. Areas defined by dashed lines in FIGS. 5 and 6 indicate a state in which the slit of the second additive injection hole 18b is made in a thick section of the fuel spray nozzle 11b.

(33) Then, the second additive injection hole 18b injects the additive into the combustion burner (not illustrated) (to the outside of the fuel spray nozzle 11b) at an angle at which the additive collides with the liquid fuel injected from the liquid fuel injection hole 19. In this case, as the second additive injection hole 18b is a slit, the additive is diffused over a wide range, and the liquid fuel that has collided with the additive is also diffused over a wide range, thus accelerating the mixing of the liquid fuel, the additive, and air to an even greater extent.

(34) In FIG. 6, four of the second additive injection holes 18b are illustrated, but the present embodiment is not limited thereto, and there may be any number of the second additive injection holes 18b, as long as there is one or more. Even when there is a plurality of the second additive injection holes 18b, similarly to the first embodiment, as the pressure of the additive is equalized in the additive pressure equalization space (not illustrated), it is possible to uniformly inject the additive from each of the holes (slits).

(35) Furthermore, in the above description, only the second additive injection hole 18b is formed as the slit, but the present embodiment is not limited thereto. Only the liquid fuel injection hole 19 may be formed as a slit, or both the second additive injection hole 18b and the liquid fuel injection hole 19 may be formed as slits.

(36) The fuel spray nozzle according to the second embodiment of the present invention has been described above. Specifically, in the fuel spray nozzle 11b according to the second embodiment of the present invention, at least one of the liquid fuel injection hole 19 and the first additive injection hole 18a of the first embodiment is formed as a slit.

(37) As described above, with the fuel spray nozzle according to the second embodiment of the present invention, it is possible to further accelerate the mixing of the liquid fuel, the additive, and air, and further NOx reduction can be accomplished.

Third Embodiment

(38) A fuel spray nozzle according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a schematic view in which a part of the fuel spray nozzle according to the third embodiment of the present invention is enlarged. FIG. 8 is a view seen in the direction of arrows D-D in FIG. 7. Furthermore, a long-dashed short-dashed line arrow in FIG. 7 indicates the flow of liquid fuel, and a dotted area indicates an injected additive.

(39) As illustrated in FIGS. 7 and 8, a fuel spray nozzle 11c is provided with the swirl vane 12, a third additive injection hole 18c, the liquid fuel injection hole 19, the additive channel (not illustrated), the liquid fuel channel (not illustrated), the additive pressure equalization space (not illustrated), and the liquid fuel pressure equalization space (not illustrated). Note that the swirl vane 12, the liquid fuel injection hole 19, the additive channel, the liquid fuel channel, the additive pressure equalization space, and the liquid fuel pressure equalization space are similar as those of the first and second embodiments, and a description thereof is omitted here.

(40) Areas defined by dashed lines in FIGS. 7 and 8 indicate a state in which a tapered slit of the third additive injection hole 18c is made in a thick section of the fuel spray nozzle 11c. The third additive injection hole 18c is formed by forming the slit of the second additive injection hole 18b of the second embodiment to have a tapered shape, as illustrated in FIGS. 7 and 8.

(41) Then, the third additive injection hole 18c injects the additive into the combustion burner (not illustrated) (to the outside of the fuel spray nozzle 11c) at an angle at which the additive collides with the liquid fuel injected from the liquid fuel injection hole 19. In this case, as the third additive injection hole 18c is a tapered slit, the additive is injected in a circumferential direction of the fuel spray nozzle 11c and is thus diffused over an even wider range. The liquid fuel that has collided with the additive is also diffused over an even wider range, thus the mixing of the liquid fuel, the additive, and air can be accelerated to an even greater extent.

(42) In FIG. 8, four of the third additive injection holes 18c are illustrated, but the present embodiment is not limited thereto, and there may be any number of the third additive injection holes 18c, as long as there is one or more. Even when there is a plurality of the third additive injection holes 18c, similarly to the first and second embodiments, as the pressure of the additive is equalized in the additive pressure equalization space (not illustrated), it is possible to uniformly inject the additive from each of the holes (slits).

(43) Furthermore, in the above description, only the third additive injection hole 18c is formed as the tapered slit, but the present embodiment is not limited thereto. Only the liquid fuel injection hole 19 may be formed as a tapered slit, or both the third additive injection hole 18c and the liquid fuel injection hole 19 may be formed as the tapered slits.

(44) The fuel spray nozzle according to the third embodiment of the present invention has been described above. Specifically, in the fuel spray nozzle 11c according to the third embodiment of the present invention, the slit of the second embodiment is formed in a tapered shape.

(45) As described above, with the fuel spray nozzle according to the third embodiment of the present invention, it is possible to further accelerate the mixing of the liquid fuel, the additive, and air, and further NOx reduction can be accomplished.

(46) The present invention is suitable as a fuel spray nozzle mounted inside a combustion burner of a gas turbine.

REFERENCE SIGNS LIST

(47) 11a Fuel spray nozzle (according to the first embodiment of the present invention) 11b Fuel spray nozzle (according to the second embodiment of the present invention) 11c Fuel spray nozzle (according to the third embodiment of the present invention 12 Swirl vane 14 Additive channel 15 Liquid fuel channel 16 Additive pressure equalization space 17 Liquid fuel pressure equalization space 18a First additive injection hole 18b Second additive injection hole 18c Third additive injection hole 19 Liquid fuel injection hole (according to the first to third embodiments of the present invention) 20 (Conventional) air-blast type combustion burner 21 (Conventional) fuel nozzle 28 (Conventional) additive injection hole 29, 39 (Conventional) liquid fuel injection hole 30 (Conventional) nozzle tip type combustion burner