KR102318108B1 - Mixed-combustion burner device - Google Patents

Abstract

The burner device 30 for mixed combustion includes an atomizer 36 disposed on the central axis of a resistor 32 and a switch disposed around the atomizer 36 . A waller 51 and a plurality of gas nozzles 65 disposed at a distance from each other on a virtual source 101 centered on an atomizer 36 are provided. Each gas nozzle 65 is provided with a gas opening 66 for a pilot flame that injects gaseous fuel toward the recirculation region formed by the swirler 51 . Further, gas openings 67, 68, and 69 for the main flame for injecting gas fuel are formed in each gas nozzle 65 so that the main flame is formed by the pilot flame.

Description

Burner device for mixed combustion {MIXED-COMBUSTION BURNER DEVICE}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a burner device for mixed combustion capable of simultaneously burning different fuels, such as liquid fuel such as heavy oil and gas fuel such as natural gas, at the same time.

Conventionally, this type of burner device for co-firing has been employed in industrial or marine boilers. In the burner device for co-firing disclosed in Patent Document 1, a swirler for flame retention is disposed at the center of the burner, and an atomizer that atomizes and supplies liquid fuel, such as heavy oil, on the central axis of the burner. (atomizer) is installed. In addition, a plurality of gas nozzles for pilot flames and gas nozzles for main flames are provided on the blade portion of the swirler and two virtual sources other than the swirler, respectively. After being introduced into the windbox, air is introduced into the combustion chamber through the resistor. At this time, as the air passes through the swirler, a vortex (recirculation region) is formed in the combustion chamber downstream of the swirler, so that the flame by the gas from the gas nozzle for the pilot flame is separated from the gas from the gas nozzle for the main flame and the atomizer. of the atomized fuel, a predetermined flame is formed in the combustion chamber.

Japanese Patent Laid-Open No. 2006-29763

By the way, this kind of burner device for co-firing is generally mounted in a large boiler, and has a large-capacity combustion amount. Such a burner device is large, and the number of parts is large. For this reason, it was difficult to apply the burner apparatus for co-firing to a medium-sized boiler or a small-sized boiler. In addition, since such a medium-sized or small-sized boiler has a large combustion amount per unit volume of the combustion chamber, ie, a combustion chamber load, as compared with a large-sized boiler, it is difficult to achieve flame stability and compactness. Therefore, in a medium-sized or small-sized burner apparatus, vibration combustion, incomplete combustion, etc. generate|occur|produce easily.

Although the burner apparatus described in patent document 1 can form a stable flame and can respond to compactization of a boiler, it is for flames of several different types, such as the gas nozzle for main flames and the gas nozzles for pilot flames. Since a gas nozzle is required, the number of parts increases and the structure is complicated. Moreover, since the gas nozzles for both flames were arranged on two different virtual emission sources in the register, the diameter of the burner device became large, and there was a limit to downsizing.

An object of the present invention is to provide a burner device for co-firing that can achieve stable flame formation and can be used for medium-sized and small-sized boilers, and has a simple configuration.

A burner device for co-firing according to an aspect of the present invention includes a fuel nozzle disposed on a central axis of a resistor, a swirler disposed around the fuel nozzle, and a virtual discharge source centered on the fuel nozzle. and a plurality of gas nozzles disposed thereon, each gas nozzle having a pilot flame gas opening for injecting gaseous fuel toward a recirculation region formed by the swirler to form a pilot flame; and a gas opening for the main flame to inject gaseous fuel to form the main flame.

According to this structure, since the gas opening for pilot flames and the gas opening for main flames are provided in one gas nozzle, one gas nozzle has the function of pilot flame formation and main flame formation. Therefore, it is not necessary to provide two types of gas nozzles. For this reason, while the number of parts of the burner apparatus for co-firing decreases, size reduction of the said apparatus becomes possible.

Other aspects and advantages will become apparent from the following description together with the drawings showing examples of the technical idea of the present invention.

1 is a cross-sectional view of a burner device for co-firing.
Fig. 2 is a cross-sectional view showing a combustion chamber of a burner device for co-firing;
Figure 3 is a perspective view of the swirler.
Figure 4 is a partially broken front view of the swirler portion.
5 is a perspective view of a gas nozzle according to an embodiment.
It is sectional drawing of the gas nozzle of embodiment.
It is a front view of the gas nozzle of embodiment.
8 is a simplified diagram showing a boiler;

(Embodiment)

As shown in FIG. 1, in the front part of the windbox 31 which forms the outer shell of the burner device for co-firing, the front-end|tip part was expanded in the cone shape. ; 32) protrudes, and the inside of this enlarged portion serves as a flame holding region (33). In addition, in this specification, let the left side of FIG. 1 be a front part. An air receiving port 311 is formed at the rear end of the wind box 31 . Air used for combustion is supplied into the windbox 31 from a duct 34 of a blower device (not shown) connected to this air receiving port 311 , and the air is supplied to a flame through a resistor 32 . It is supplied to the holding area 33 .

As shown in FIG. 1, the 1st stay 35 of a cylindrical shape is fixed to the center of the windbox 31, for example. At the tip of the first stay 35 , an atomizer 36 serving as a fuel nozzle is supported on the central axis of the resistor 32 . Liquid fuel is supplied to the atomizer 36 through an oil supply pipe 38 , and a spray medium composed of a pressure gas such as steam is supplied through an air supply pipe 37 . As the liquid fuel, heavy oil A, heavy oil B, heavy oil C, kerosene, light oil, alcohol, biofuel and the like are used. The liquid fuel ejected from the milk powder opening at the tip of the atomizer 36 is atomized by the pressure gas from the branch opening at the tip of the atomizer 36, and the flame holding region 33 ) is ejected from the center of the A second stay 41 of, for example, a cylindrical shape parallel to the first stay 35 is fixed to the outer peripheral side of the first stay 35 . A burner nozzle 42 for ignition of a burner for ignition is supported inside the tip of the second stay 41 . Liquid fuel is supplied to the burner nozzle 42 for ignition through an oil supply pipe 43 . The liquid fuel discharged from the ignition burner nozzle 42 is ignited by a spark of an ignitor (not shown), and the flame propagates to the fuel in the flame holding region 33 . As the liquid fuel in this case, heavy oil A, light oil, kerosene, or the like is used.

As shown in FIGS. 1-3, the cylindrical boss 52 of the swirler 51 for flame retention is being fixed to the front end of the 1st stay 35. As shown in FIG. A plurality of blades 53 configured to generate, for example, a spiral air flow are fixed to the outer periphery of the boss 52 . A guide ring 54 concentric with the boss 52 is fixed to the tip of the blade 53 . As the air from the resistor 32 is guided by the guide ring 54 and passes through the flow path between the blades 53, a flame is formed in the flame holding region 33, as shown in FIG. 4 , In the flame holding region 33 , a swirl flow centering on the atomizer 36 and the swirler 51 or the central axis 100 of the flame holding region 33 is formed. Moreover, as shown in FIG. 2, in the flame holding|maintenance area|region 33, in the area|region above the central axis line 100, the recirculation area|region of a negative pressure is formed from the circumference|surroundings.

As shown in FIG. 1 , a gas fuel chamber 61 is partitioned at the rear end in the windbox 31 . Gas fuel is supplied to this gas fuel chamber 61 through a supply pipe 62 . As gas fuel, liquefied natural gas, liquefied petroleum gas, low-calorie gas, etc. are used. A plurality of (for example, five) cylindrical gas conduits 63 are connected to the gas fuel chamber 61 . Each gas conduit 63 is fixed to the inner surface of the wind box 31 by a bracket (not shown). Each gas conduit 63 includes a rear end connecting portion 64 and a gas nozzle 65 removably attached to the front end of the rear end connecting portion 64 by means of a screw. The gas nozzle 65 constitutes a gas burner. In this embodiment, as shown in FIG. 4, the some gas nozzle 65 is arrange|positioned at equal pitch with mutual spacing on the virtual discharge source 101 centering on the central axis line 100. As shown in FIG. The tip surface 652 of the gas nozzle 65 is formed in a conical shape. The virtual excretion source 101 passes over the central axis 102 of each gas nozzle 65 .

1 and 3, in the swirler 51, at a position eccentric outward from the center, one housing cylinder 55 is fixed, and the burner nozzle for ignition ( 42) is accepted. The guide ring 54 has a plurality of (five in the embodiment) recessed portions 56 formed at equal intervals. A gas nozzle 65 is accommodated in each recess 56 . Accordingly, the plurality of gas nozzles 65 are located radially inside the swirler 51 from the outer diameter surface of the swirler 51 . A slight gap may be formed between the inner circumferential surface of the concave portion 56 and the outer circumferential surface of the gas nozzle 65 . As shown in FIG. 1, the front-end|tip of the burner nozzle 42 for ignition is located in the back of the front-end opening surface 511 of the swirler 51 in the housing cylinder 55. As shown in FIG. As shown in FIG. 3 , the tip of each gas nozzle 65 protrudes forward from the front end opening surface 511 of the swirler 51 , toward the flame holding region 33 , or into the flame holding region 33 . has been

5 to 7, one pilot flame gas opening (hereinafter referred to as a pilot opening) 66 that is opened at the outer peripheral surface 651 of the gas nozzle 65 at the tip of the gas nozzle 65 . is installed through. The pilot opening 66 is viewed from a direction parallel to the central axis 100 (hereinafter referred to as a front view) and, as shown in FIG. 4 , is a radial center of the virtual excretion source 101 . direction oriented. Accordingly, the gas is ejected from the pilot opening 66 in the direction of the central axis 100 . The central angle θ1 of the pilot opening 66 with respect to the central axis 102 of the gas nozzle 65 is within the range of -45° to +45° with respect to the radial line 103 of the virtual excretion source 101 . and is set to 0° in this embodiment.

As shown in FIGS. 4-7, at the front-end|tip part of the gas nozzle 65, the gas 1st opening (henceforth a 1st opening) 67 for main flames opened from the outer peripheral surface 651, and for main flames A gas second opening (hereinafter referred to as a second opening) 68 is formed. The 1st opening 67 is located in the range of 15 degrees - 90 degrees in the forward direction 104 of the swirl flow with respect to the radial line 103 with the central angle θ2 about the central axis 102 as a center. In this embodiment, the central angle θ2 is 36°. For this reason, the 1st opening 67 is the radial central direction of the virtual excretion source 101 in the front view, and is oriented toward the forward direction 104 of the swirl flow, and gas is ejected in that direction. Therefore, the virtual radial line 103 formed in the radial direction inward of the virtual source 101 by the first opening 67 and combustion by the swirler 51 as a tangential direction of the virtual source 101 The blowing direction of the gas fuel by the 1st opening 67 is set within the angular range between the forward direction 104 of molten air, ie, the swirl flow, and the virtual tangent line formed in the same direction.

In the second opening 68 , a central angle θ3 with respect to the radial line 103 with respect to the central axis 102 of the gas nozzle 65 is located within a range of 90° to 180°. In the present embodiment, the central angle θ3 is 108°. Accordingly, the second opening 68 is directed toward the forward direction 104 of the swirl flow in the direction opposite to the radial direction of the virtual excretion source 101 in the front view, and gas is ejected in that direction. That is, the virtual radial line 103 formed outward in the radial direction of the virtual source 101 by the second opening 68, and the swirler 51 as the tangential direction of the virtual source 101 The blowing direction of the gas fuel by the 2nd opening 68 is set within the angle range between the air for combustion, ie, the forward direction 104 of the swirl flow, and the virtual tangent line formed in the same direction.

As shown in FIG. 5 , the pilot opening 66 , the first opening 67 , and the second opening 68 are formed at the same position in the axial direction of the gas nozzle 65 , and of the gas nozzle 65 . Orienting radially about the central axis 102 , they 66 , 67 , 68 are of the same diameter. In addition, as shown in FIG. 2, the pilot opening 66, the 1st opening 67, the 2nd opening 68, and the 3rd opening 69 are the front end opening surfaces 511 of the swirler 51. It is located in the front.

As shown in FIGS. 5 to 7 , a third opening (hereinafter referred to as a third opening) 69 for the main flame opened from the tip surface 652 is provided through the tip of the gas nozzle 65, have. The third opening 69 has a central angle θ4 in the range of +45° to -45° on the radial outward side with respect to the central axis 102 as a center. In this embodiment, θ4 is 0°. Accordingly, the third opening 69 is oriented outward in the radial direction of the virtual excretion source 101 in the front view, that is, by the third opening 69, from the tip of the gas nozzle 65 to the gas nozzle. The gas is ejected outward in the radial direction of the virtual excretion source 101 of (65).

Of the total amount of the total gas fuel ejected from the gas nozzle 65 , approximately 40% is from the third opening 69 , and approximately 20% is respectively from the pilot opening 66 , the first opening 67 , and the second opening 68 . ), the inner diameter of each opening 66-69 is set so that it may eject from it.

As shown in FIG. 2 , in the side view, the pilot opening 66 , the first opening 67 and the second opening 68 face a direction downstream of the recirculation region and face inward, respectively, along the central axis ( It is inclined with respect to the axis 105 parallel to 100). The inclination angles of these openings 66 , 67 and 68 with respect to the axis 105 are the largest in the pilot opening 66 , and the smallest in the order of the first opening 67 and the second opening 68 . The third opening 69 faces in a direction downstream of the recirculation region, faces outward, and is inclined with respect to an axis 105 parallel to the central axis 100 .

As shown in FIG. 8, the burner apparatus 30 for co-firing comprised as mentioned above is assembled to the casing of the boiler 80, and is operated.

Next, the effect|action of the burner apparatus for co-firing of this embodiment is demonstrated.

By operation of a blower (not shown), air is introduced into the windbox 31 from the air receiving port 311 at the rear end of the windbox 31 . The air passes through the resistor 32, within the swirler 51, and centered on the axis 100 within the flame holding area 33 from the front opening surface 511 of the swirler 51, It becomes a recirculation flow which flows into the central axis line 100 side from the outside with a flow as a swirl vortex flow (旋回流). At this time, while liquid fuel is sprayed in the flame holding area 33 from the atomizer 36 along the central axis 100 direction, the burner nozzle 42 for ignition and the pilot opening 66 of the gas nozzle 65 are And gaseous fuel is ejected from 1st opening - 3rd opening 67-69. At the same time, ignition of the liquid fuel is performed by the igniter in the burner nozzle 42 for ignition. The flame propagates to the fuel from atomizer 36 and gas nozzle 65 .

At this time, a flame is formed by the recirculation flow accompanying turning by the swirler 51 in the center of the flame holding region 33, and the fuel ejected from the atomizer 36 and the gas nozzle 65 by this flame. can continue to burn stably. That is, the air passing through the swirler 51 from the resistor 32 is subjected to rotation in one direction by the action of the swing blade of the swirler 51, thereby forming a recirculation region. For this reason, mixing of air with the fuel ejected from the atomizer 36 and the gas nozzle 65 is accelerated|stimulated, and a stable flame is formed. Moreover, in the flame holding area|region 33, after the flame by the fuel from the atomizer 36 and the gas nozzle 65 is stabilized, supply of the liquid fuel from the burner nozzle 42 for ignition is stopped. Thus, after the flame by the fuel from the atomizer 36 and the gas nozzle 65 stabilizes, the operation|movement of the burner for ignition is stopped. However, when the flame is unstable, it is also possible to operate the ignition burner, and it is also possible to operate it all the time. In particular, when a fuel having a small calorific value is used, the ignition burner is always operated in some cases. In addition, although the liquid fuel is used for the burner for ignition in this embodiment, it is also possible to use gas fuel.

Moreover, since the gas nozzle 65 is provided in the periphery of the atomizer 36 on the central axis 100 of the flame holding area 33, the burner apparatus 30 for co-firing of this embodiment is combined with oil and It can be used not only for oil-gas co-firing that can burn gas at the same time, but also for oil-burning and gas burning. In this case, in the recirculation region, which is a negative pressure region formed by the swirler 51, an oil flame or a gas flame is sufficiently flame-retained, and a stable flame is formed. Therefore, by using oil and gas fuel, high turndown ratio operation is possible in full-burn operation and mixed-fire operation, and a compact and stable flame can be formed.

In this embodiment, the following actions and effects can be obtained.

(1) The gas nozzle 65 is provided with a pilot opening 66 through which gas fuel is injected toward the recirculation region formed by the swirler 51 , and is piloted by the gas fuel injected from the pilot opening 66 . A flame is formed. Moreover, in the gas nozzle 65, the 1st opening - 3rd opening 67-69 through which the gas fuel for forming a main flame is injected based on a pilot flame is provided. Therefore, unlike the conventional configuration, it is not necessary to separately provide the pilot gas nozzle and the main gas nozzle for supplying gas fuel for the pilot flame, thereby simplifying the configuration by reducing the number of parts and reducing the swirler 51 . The miniaturization of the device by hardening becomes possible.

(2) The jetting direction of the gas fuel from the pilot opening 66 was set so as to be located within the range of -45° to +45° in the radial central direction of the virtual excretion source 101 of the gas nozzle 65 . . According to this configuration, a compact and stable pilot gas flame can be formed by supplying an appropriate amount of gas from the pilot opening 66 to the recirculation region formed by the swirler 51 . Therefore, as mentioned above, while being able to contribute to the downsizing of the whole burner apparatus for co-firing, the burner apparatus for co-firing with low vibration can be obtained.

(3) In particular, the ejection direction of the gas fuel from the pilot opening 66 was set to be the radial central direction of the virtual excretion source 101 . According to this structure, an appropriate amount of gas can be further supplied from the pilot opening 66 to the recirculation area|region formed by the swirler 51, and a stable gas flame for pilots can be formed. In particular, in gas burnout operation, this effect is large.

(4) In the side view shown in Fig. 2, the pilot opening 66 is directed forward and inwardly inclined in the forward direction of the front end opening surface 511 of the combustion air outlet of the swirler 51. The gas was blown out from the location toward a location downstream of the recirculation flow. For this reason, with respect to the recirculation area|region formed in the downstream of the swirler 51, or its vicinity, the gaseous fuel ejected from the pilot opening 66 is supplied suitably, and a stable gas flame is formed.

(5) In the side view, the orientation angle of the pilot opening 66 at the position in front of the front end opening surface 511 of the swirler 51 is inclined forwardly and inwardly toward the position downstream of the recirculation area. It was opened so that gas was ejected. For this reason, the gas stream from the pilot opening 66 is drawn in from the outer periphery of the recirculation area, and gaseous fuel preferably mixes in the recirculation area. For this reason, the recirculation flow is not destroyed, and a compact and stable flame is formed. On the other hand, in the side view, when the gas ejection direction from the pilot opening is inward substantially perpendicular to the central axis 100, the gas flow passes through the recirculation region, and a part of this circulation flow is broken. In such a case, flame stability is inhibited, and it becomes easy to cause instability of a flame. In this embodiment, generation|occurrence|production of such a problem can be suppressed.

(6) The tip of the gas nozzle 65 protrudes from the front end opening surface 511 of the swirler 51 toward the flame holding region 33 side. For this reason, as is evident from Fig. 2, the pilot opening 66 and the first to third openings 67, 68 and 69 are at effective positions for facilitating the introduction of gaseous fuel into the recirculation region from the outer peripheral side thereof. can be easily placed. Therefore, it can contribute to the formation of a compact and stable flame.

(7) Since the pilot opening 66 is opened at the outer peripheral surface 651 of the gas nozzle 65, for flame stabilization, the pilot opening 66 is inclined in the downstream direction in the central axis 100 direction. It is easy to direct, and it is possible to effectively and simply contribute to the formation of a compact and stable flame.

(8) A radial line formed in the radial inward direction of the virtual source 101 of the gas nozzle 65 by the first opening 67 and the swirler 51 as a tangent to the virtual source 101 The ejection direction of the gas fuel is set within the angular range between the turning direction of the combustion air and the virtual tangent formed in the same direction. According to this configuration, an appropriate amount of gas can be supplied from the first opening 67 to the recirculation region formed by the swirler 51, and an appropriate amount of gas can be supplied around the pilot gas flame, It does not extend long and can form a compact, stable pilot gas flame.

(9) Turning of combustion air by the swirler 51 as the tangential direction of the virtual radial line in which the 2nd opening 68 is formed radially outward of the virtual source 101, and the virtual source 101 It is oriented within the angular range between the direction and the virtual tangent formed in the same direction. Accordingly, gas is supplied from the second opening 68 towards the recirculation region to surround the gas ejection region from the first opening 67 . For this reason, it is possible to form a compactly and stably agglomerated main flame.

(10) The third opening 69 is radially outward of the virtual source 101 of the gas nozzle 65 at the tip end of the gas nozzle 65, and is also opened in the direction of the recirculation region in the side view. . Accordingly, gas is supplied to the flow of air on the outside of the swirler 51, and a flame surrounding the outside of the recirculation region is formed. For this reason, the flame holding|maintenance area|region 33 whole can be used effectively, and a lumped flame can be formed. Therefore, a compact flame can be formed with high efficiency, and a high-efficiency operable co-firing burner device can be realized without increasing the size.

(11) The gas nozzle 65 enters the center side rather than the outer shape of the swirler 51 and is located. Accordingly, the pilot gas tends to be mixed in the recirculation area formed on the front surface of the swirler. Moreover, the external shape of the burner apparatus for co-firing becomes small, and size reduction becomes possible.

In addition, this invention is not limited to the said embodiment, You may change as follows. You may combine several modified examples suitably.

As in the example of FIG. 6 , the pilot opening 66 , the first opening 67 , and the second opening 68 obliquely penetrate the tip block of the gas nozzle 65 , and the outer peripheral surface 651 of the gas nozzle 65 . ) may be an inclined gas passage opened at may be In another example, the pilot opening 66 may be an inclined gas passage obliquely penetrating the outer peripheral wall of the gas nozzle 65 except for the tip block of the gas nozzle 65 . At least one of the pilot opening 66 , the first opening 67 , and the second opening 68 may be opened at the distal end face 652 of the gas nozzle 65 . The tip surface 652 of the gas nozzle 65 may be a convex curved surface such as a semicircle.

- In the embodiment, the gas nozzle 65 is formed in a cylindrical shape and its cross-sectional shape is formed in a circular shape. It is not limited to this, It is good also as a square cylindrical shape so that the gas nozzle 65 may be formed in polygons, such as a pentagonal, a hexagon, and an octagon, in cross section.

- In embodiment, the recessed part 56 is formed in the outer periphery of the swirler 51, and the gas nozzle 65 is arrange|positioned at the center side of the radial direction from the outer diameter position of the swirler 51. As shown in FIG. The position in the radial direction of the swirler 51 of the gas nozzle 65 may be displaced so as to approach the center more than in the embodiment, and as shown by the dashed-dotted line in FIG. 4 , from the position of the outer diameter of the swirler 51 You may penetrate the blade 53 of the swirler 51 at the position approached to the center side. Alternatively, the arc of the concave portion 56 may be made shallow and displaced to the outer-diameter side of the swirler 51 than in the embodiment, or may be disposed outside from the outer-diameter position of the swirler 51 .

- As for the atomizer 36, although the thing of a vapor|steam spray type is used, two-fluid injection atomizers, such as an air spray type atomizer, may be sufficient. Also, a pressure spray type atomizer that does not use an atomizing medium may be used.

- Instead of the atomizer 36, you may provide a gas nozzle as a fuel nozzle in the center part of the swirler 51. As shown in FIG. In this case, the gas fuel ejected from the central gas nozzle may be of the same type as the gas ejected from the non-central gas nozzle 65 , or may be of a different type. When it is set as the same kind of gas, a burner apparatus becomes a burner apparatus for gas burnout, and when it is set as a different kind of gas, it turns into a burner apparatus for co-firing of different gases.

- The number of gas nozzles 65 is not limited to five. Any number of 2-4, 6 or more is possible. In this case, the gas nozzles 65 are preferably arranged at equal intervals.

· You may provide a plurality of gas openings for pilot flames within the range (±45°) of the central angle θ1.

- You may change the number of gas openings for main flame to any one of 1, 2, or 4 or more.

- In embodiment, although the burner apparatus 30 for co-firing is embodied as an object for the boiler 80, it is not limited to this, It can utilize for other uses, such as an object for an industrial furnace and a hot-air generator object.

In embodiment, although the front-end|tip part of the gas nozzle 65 was made to protrude from the front-end opening surface 511 of the swirler 51 toward the flame holding area|region 33 side, you may make it not protrude. Even if it is comprised in this way, since the gas nozzle 65 is located at the outer periphery of the swirler 51, the pilot opening 66 and the 1st opening - 3rd opening are located at the position which is easy to draw in gas fuel from the outer periphery of a recirculation area to the inside. (67, 68, 69) can be placed.

In the embodiment, the pilot opening 66, the first opening 67, and the second opening 68 have the same diameter, but the diameters of these openings 66, 67, 68 and the third opening 69 are Various conditions, for example, are appropriately set according to conditions such as the ratio of the amount of air passing through the inside of the swirler 51 to the amount of air passing through the outside of the swirler 51, the swirling strength of the swirler. Therefore, the ratio of the quantity of the gaseous fuel ejected from each opening 66, 67, 68, 69 is also set suitably according to various conditions.

This invention is not limited to what was illustrated. For example, the illustrated features should not be construed as essential to the present invention, rather, inventive subject matter may exist in less than all features of a particular disclosed embodiment. The present invention is indicated by the claims, and it is intended that all modifications within the scope of the claims and equivalents are included.

Claims (19)

A fuel nozzle disposed on the central axis of the register;
a circular swirler disposed around the fuel nozzle;
In a burner device for co-firing, a plurality of gas nozzles are provided with a plurality of gas nozzles spaced apart from each other on an imaginary circle adjacent to the outer diameter surface of the swirler so that a part of each gas nozzle is exposed to the outside,
The gas nozzle protrudes further downstream in the axial direction than the swirler,
In order to form a pilot flame, the pilot flame is set in an ejection direction within a predetermined angular range with respect to a radius toward the central axis of the imaginary circle, and gas fuel is injected toward the recirculation area formed by the swirler. a gas opening for
To form a main flame (main flame), to provide a gas opening for the main flame through which gas fuel is injected,
The pilot flame gas opening is disposed inside the virtual circle and inside the outer diameter surface of the swirler, and the gas is ejected from the opening surface on the flame holding area side of the swirler toward the downstream position,
The gas opening for the main flame is disposed outside the imaginary circle and outside the outer diameter surface of the swirler, and the gas opening for the main flame opens outward in the radial direction of the swirler on the front end surface of the tip of the gas nozzle. A burner device for co-firing, characterized in that it comprises a. The method of claim 1,
A burner device for co-firing in which the gas opening for the pilot flame of the gas nozzle is opened to an outer peripheral surface of the gas nozzle. The method of claim 1,
A burner device for co-firing in which a concave portion positioned on the center side of the swirler rather than the virtual circle is formed in the swirler, and a gas nozzle is disposed in the concave portion. The method of claim 1,
A burner device for co-firing, wherein an inner diameter of the gas opening for the main flame that opens on the front end surface of the tip of the gas nozzle is set to be larger than the inner diameter of the gas opening on the main flame that opens on the outer peripheral surface of the tip of the gas nozzle. The method of claim 1,
The gas opening for the pilot flame is a burner device for co-firing in which the gas ejection direction is inclined toward the central axis with respect to the axial downstream direction. The method of claim 1,
The gas opening for the main flame, which is opened on the outer peripheral surface of the tip of the gas nozzle, is a tangent to the inward radial line of the imaginary circle and the imaginary circle, and the swirling direction of the combustion air by the swirler. A burner device for co-firing in which the ejection direction of the gas fuel is set within an angle range between the tangent and the virtual tangent in the same direction. The method of claim 1,
The gas opening for the main flame opened to the outer peripheral surface of the tip of the gas nozzle,
Injection of gas fuel within an angular range between a virtual radial line formed outward in the radial direction of the virtual circle and a virtual tangent line formed in the same direction as the swirling direction of the combustion air by the swirler as a tangent direction of the virtual circle A burner device for co-firing with a direction set. a fuel nozzle disposed on the central axis of the register;
a circular swirler disposed around the fuel nozzle and forming a swirler flow around the central axis;
In the burner device for co-firing, a plurality of columnar gas nozzles disposed at a distance from each other on a virtual circle adjacent to the outer diameter surface of the swirler so that a part of each gas nozzle is exposed to the outside,
The gas nozzle is
In order to form a pilot flame, it is formed on the outer peripheral surface of the gas nozzle, and is set in an ejection direction within a predetermined angular range with respect to a radial line toward the central axis of the imaginary circle, the inner side of the imaginary circle and the outer surface of the swirler A gas opening for a pilot flame through which gas fuel is injected toward the recirculation region along the swirler flow formed by the swirler while being disposed on the inside;
a first opening configured to eject gas to surround a gas ejection region of the pilot flame gas opening from the outside;
In order to form a main flame, it is arranged on the outside of the virtual circle and the outside of the outer diameter surface of the swirler, and is configured by providing a gas opening for the main flame through which gas fuel is injected toward the outside of the virtual circle. A burner device for mixed combustion. 9. The method of claim 8,
In the gas nozzle,
and a second opening configured to eject gas to surround the gas ejection region of the first opening from the outside is provided. 9. The method of claim 8,
The gas opening for the pilot flame and the first opening are formed at the same position in the axial direction of the gas nozzle. 9. The method of claim 8,
The gas opening for the pilot flame and the first opening are located on the downstream side of the surface including the front opening surface of the swirler. 9. The method of claim 8,
In the gas opening for the pilot flame and the first opening, the first opening is set to have a larger angle than the gas opening for the pilot flame with respect to the radial line on the central axis of the nozzle. . 10. The method of claim 9,
In the gas opening for the pilot flame, the first opening, and the second opening, the first opening has a larger angle than the gas opening for the pilot flame with respect to the radial line on the central axis of the nozzle, and the second opening is a burner device for co-firing, characterized in that it is set to have a larger angle than the first opening. 9. The method of claim 8,
The gas opening for the pilot flame and the first opening are oriented inward in the downstream direction of the recirculation region and are inclined with respect to an axis parallel to the central axis, respectively. 15. The method of claim 14,
The gas opening for the pilot flame and the inclination angle of the first opening are larger than the first opening of the gas opening for the pilot flame with respect to an axis parallel to the central axis. 9. The method of claim 8,
The gas opening for the pilot flame and the first opening are formed to have the same inner diameter as the burner device for co-firing. The gas nozzle according to any one of claims 1 to 16. The swirler according to any one of claims 1 to 16. A boiler in which the burner device for co-firing according to any one of claims 1 to 16 is incorporated in a boiler casing.

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