JP2017062066A - Function addition device for burner device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a function addition device for a burner device which adds a mixed combustion function to an existing burner device.SOLUTION: In a function addition device for a burner device, a connection part 72 which is detachably connected with a first portion 321 and a second portion 322 of a cylindrical register 32 of a burner device 30 is provided. A gas nozzle 65 disposed in a combustion zone in the register 32 is supported by the connection part 72. An introduction pipe 83 communicating with the gas nozzle 65 is provided at the outer periphery side of the connection part 72. The function addition device for the burner device enables a fuel to be supplied to the combustion zone from the introduction pipe 83 through the gas nozzle 65 in a state where the connection part 72 is connected with the register 32.SELECTED DRAWING: Figure 7

Description

  The present invention adds, for example, a new function such as a function of mixing and burning oil and gas (hereinafter referred to as mixed combustion) or improving combustion capacity to an existing burner device. The present invention relates to a function addition device attached to a burner device.

  Patent Document 1 discloses a burner device having a mixed firing function. That is, the burner device of Patent Document 1 is equipped with an oil combustion burner (hereinafter referred to as an oil burner) and a gas combustion burner (hereinafter referred to as a gas burner).

JP 2006-29763 A

  The burner device of Patent Document 1 has a function of co-firing two types of fuel as described above. When such a function is not necessary, a simple single-function configuration is employed only for burning one of the fuels. However, when the demand for capacity as a burner device is increased, or when exhaust gas regulations are strengthened, a configuration to satisfy those requirements is required. Adding this configuration to the device is extremely difficult.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned technical problems, and even an existing burner device can be modified so that the function of the burner device can be easily improved. It is to provide a function adding device for use.

  In order to achieve the above object, in the present invention, a connecting portion that is detachably connected to a cylindrical register of a burner device, and a fuel that is supported by the connecting portion and disposed in a combustion region in the register. A nozzle, and a communication pipe provided on the outer peripheral side of the connection portion and communicating with the fuel nozzle, with the connection portion being connected to the register, from the communication tube to the combustion region via the fuel nozzle. It is characterized in that fuel can be supplied.

  In the above configuration, when the connecting portion is connected to the register of the burner device, a new fuel nozzle is arranged in the register. Therefore, the fuel can be supplied from the new nozzle together with the existing nozzle of the burner device, and co-firing and improvement of the combustion capability are possible.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that a mixed-burning function can be added or a combustion capability can be improved by attaching to an existing boiler.

The perspective view of a burner apparatus. The partial cutaway perspective view of a burner apparatus. Sectional drawing of a combustion part. Front view of the swirler. The perspective view of the function addition apparatus of 1st Embodiment. The perspective view of the burner apparatus which attached the function addition apparatus of 1st Embodiment. The partial cutaway perspective view of the burner apparatus which attached the function addition apparatus of 1st Embodiment. The perspective view of a swirler. The front view which shows the function of a gas burner. The perspective view of a gas burner. Sectional drawing of a gas burner. The front view of a gas burner. Sectional drawing which shows the example of a change of 1st Embodiment. The perspective view of the burner apparatus of a structure different from FIG. The partial cutaway perspective view of a burner apparatus. The perspective view of a swirler. The perspective view of a burner unit. The front view of a swirler part. Sectional drawing of a swirler part. The perspective view of the function addition apparatus of 2nd Embodiment. The perspective view of the burner apparatus which attached the function addition apparatus of 2nd Embodiment. The partial cutaway perspective view of the burner apparatus which attached the function addition apparatus of 2nd Embodiment.

An embodiment embodying the present invention will be described with reference to the drawings.
(First embodiment)
The first embodiment will be described below with reference to FIGS.

First, the structure of the burner apparatus to which the function addition apparatus 71 (refer FIG. 5) is not attached is demonstrated.
As shown in FIGS. 1-3, the bottom plate 301 for installing the apparatus 30 in the stable state is provided in the lower part of the burner apparatus 30. As shown in FIG. An intake duct 311 is provided below the wind box 31 of the burner device 30, and a fan (not shown) is provided inside the intake duct 311. The fan is rotated by a motor 34 outside the wind box 31 and sucks outside air from the lower opening of the intake duct 311 and sends it into the wind box 31.

  A cylindrical register 32 projects forward from the upper portion of the front wall 312 of the wind box 31, and the inside of the register 32 communicates with the internal space of the wind box 31. The register 32 has an enlarged diameter portion 42 at the tip, and communicates with the inside of the wind box 31. The inside of the enlarged diameter portion 42 is a flame holding region 33. A mounting flange 43 is welded to the tip of the register 32, and the register 32 is connected to the combustion chamber 90 of the boiler at the mounting flange 43. Then, the air introduced into the wind box 31 passes through the register 32 and is supplied into the combustion chamber 90 from the enlarged diameter portion 42.

  The register 32 is separated into a first portion 321 on the proximal end side and a second portion 322 on the distal end side in the middle portion in the length direction, and a connecting flange 44 is welded to the opposite ends thereof. Yes. Both connecting flanges 44 are connected in an airtight manner by bolts 45 and nuts (not shown).

  A mounting hole 314 is formed in the rear wall 313 of the wind box 31 at a position facing the register 32. A support plate 46 is fixed to the outer surface of the rear wall 313 so as to close the mounting hole 314. A main stay 35 is inserted into and supported by a support cylinder 47 at the center of the support plate 46 so that its position can be adjusted in the axial direction. The tip of the main stay 35 is supported in contact with the inner surface of the tip of the register 32 via a bracket 48.

  At the front end of the main stay 35, an atomizer 36 as an oil fuel nozzle located in the flame holding region 33 on the central axis of the register 32 is supported. Liquid fuel is supplied to the atomizer 36 through an oil supply pipe 38, and a spray medium made of a pressure gas such as steam is supplied through an air supply pipe 37. As the liquid fuel, A heavy oil, B heavy oil, C heavy oil, kerosene, light oil, alcohol, biofuel and the like are used. Then, the liquid fuel ejected from the jet opening at the tip of the atomizer 36 is atomized by the pressure gas from the jet opening at the tip of the atomizer 36 and ejected to the center of the flame holding region 33.

  A cylindrical sub stay 39 parallel to the main stay 35 is fixed to the outer peripheral side of the main stay 35, and an ignition burner (not shown) is supported inside the tip. Liquid fuel is supplied to the ignition burner via an oil supply pipe (not shown). Then, the liquid fuel discharged from the nozzle of the ignition burner is ignited by the spark of an igniter (not shown), and the flame is propagated to the fuel in the flame holding region 33. In this case, A heavy oil, light oil, kerosene or the like is used as the liquid fuel.

  As shown in FIGS. 2 to 4, a single firing swirler 51 for flame holding is detachably supported by a bolt 57 at a central attachment portion 52 at the front end of the main stay 35. A plurality of spiral blades 53 are fixed to the outer periphery of the attachment portion 52. A guide ring 54 positioned concentrically with the mounting portion 52 is fixed to the tip of the blade 53. The guide ring 54 is provided with an accommodation cylinder 55, and the accommodation cylinder 55 accommodates the tip of the sub stay 39.

The burner device 30 operates as follows.
Air from the intake duct 311 is introduced into the wind box 31. Then, the air from the wind box 31 passes through the swirler 51 through the register 32 and flows as a swirling flow around the axis line 100 from the front end opening surface 511 of the swirler 51 into the flame holding region 33, and from the outside. A recirculation flow flows into the central axis 100 side. At this time, the liquid fuel is sprayed from the atomizer 36 into the flame holding region 33 along the direction of the central axis 100. At the same time, the liquid fuel is ignited by the igniter at the nozzle of the ignition burner. Then, the flame is transmitted to the fuel from the atomizer 36 (0). For this reason, a flame with the swirl flow and the recirculation flow is formed, and the boiler is heated. In the flame holding region 33, the ignition burner is stopped with the flame stabilized.

  Next, the function addition device 71 shown in FIG. 5 and its related configuration will be described. In this case, in the state in which the function addition device 71 is incorporated in the burner device 30, these configurations will be described. The function adding device 71 of this embodiment is suitable for being implemented in the small burner device 30.

  As shown in FIGS. 7 and 8, a flame holding mixed swirler 85 having the same function is detachably attached to the main stay 35 by a bolt 45 instead of the single firing swirler 51. Similar to the single firing swirler 51, the mixed firing swirler 85 includes an attachment portion 52, a plurality of spiral blades 53, a guide ring 54 positioned at the tip of the blades 53, and a housing cylinder 55. . However, unlike the single firing swirler 51, the mixed firing swirler 85 has concave portions 56 formed at a plurality of locations (five locations in the embodiment) of the guide ring 54.

  As shown in FIGS. 5 to 7, the function adding device 71 is interposed between the first portion 321 and the second portion 322 of the register 32. That is, the function addition device 71 is configured by a connection unit 72, an introduction unit 73, and a supply unit 74.

  The connecting portion 72 of the function adding device 71 includes an inner cylinder 75 having the same diameter as the register 32, an intermediate cylinder 77 positioned on the outer peripheral side of the inner cylinder 75 with an annular chamber 76 serving as a supply chamber, and an intermediate cylinder thereof. The outer cylinder 79 is provided on the outer circumferential side of the outer chamber 78 with a space between the outer chambers 78, and the cylinders 75, 77, 79 are arranged concentrically. The connecting portion 72 includes a connecting flange 80 welded to both sides of the cylinders 75, 77, and 79. The connecting flange 80 is provided with a hole 82 for allowing the bolt 45 to pass therethrough. The connecting flange 80 is fixed by a bolt 45 in a state where the connecting flange 80 is joined to the connecting flange 44 of the register 32.

  A plurality of (five in the embodiment) gas supply pipes 63 constituting the supply part 74 are fixed to the inner cylinder 75 at the base end part 64, and the gas supply pipes 63 communicate with the annular chamber 76. Has been. The proximal end portion 64 is bent at 90 degrees by an arc-shaped bent portion, and the distal end side of each gas supply pipe 63 is arranged in parallel by this bending. Further, a gas nozzle 65 is detachably fixed to the tip of each gas supply pipe 63 via a screw.

  An introduction pipe 83 that constitutes the introduction portion 73 is fixed to the intermediate cylinder 77, and the introduction pipe 83 communicates with the annular chamber 76. A suction tube 84 is fixed to the outer cylinder 79, and the suction tube 84 communicates with the outer chamber 78. The introduction pipe 83 is connected to a gas supply source (not shown), and gas from the gas supply source is supplied to the gas nozzle 65 via the annular chamber 76 and the gas supply pipe 63. Note that when gas leaks in the annular chamber 76 or the like, the leaked gas is sucked into a suction device (not shown) through the suction pipe 84.

  In the present embodiment, as shown in FIG. 9, the gas nozzles 65 are arranged at equal pitches on the virtual arrangement circle 101 centered on the central axis 100 with a mutual interval. The front end surface 652 of the gas nozzle 65 is formed in a conical shape. The virtual arrangement circle 101 passes on the central axis 102 of the gas nozzle 65.

  As shown in FIGS. 7 and 9, the gas nozzle 65 is accommodated in the concave portion 56 of the mixed-burning swirler 85 with a slight gap between the inner peripheral surface of the concave portion 56. The inner diameter side portion of the swirler 85 of the gas nozzle 65 is located inward in the radial direction of the swirler 85 from the outer diameter surface of the swirler 85. The tip of the nozzle of the ignition burner is located behind the opening surface 811 at the front end of the swirler 85 in the housing cylinder 55. The gas nozzle 65 has a tip protruding from the opening surface 811 toward the flame holding region 33.

  As shown in FIGS. 10 to 12, at the tip of the gas nozzle 65, one pilot flame gas opening (hereinafter referred to as a pilot opening) 66 that opens to the outer peripheral surface 651 is provided. When viewed from a direction parallel to the central axis 100 (hereinafter referred to as a front view), the pilot opening 66 is directed toward the center of the virtual arrangement circle 101 in the radial direction as shown in FIG. Accordingly, gas is ejected from the pilot opening 66 toward 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 set within a range of minus 45 degrees to plus 45 degrees with respect to the radial line 103 of the virtual arrangement circle 101, and in this embodiment, 0 degrees. Is set to

  As shown in FIGS. 9 to 12, at the tip of the gas nozzle 65, a main flame gas first opening 67 (hereinafter referred to as a first opening) 67 opened on the outer peripheral surface 651 and a main flame gas second opening. 68 (hereinafter referred to as a second opening). The first opening 67 has a central angle θ2 centered on the central axis 102 within a range of 15 to 90 degrees in the forward direction 104 of the swirl flow with respect to the radial line 103. In the present embodiment, the central angle θ2 is 36 degrees. For this reason, the first opening 67 is directed toward the center in the radial direction of the virtual arrangement circle 101 in the front view and is directed in the forward direction 104 of the swirl flow, and the gas is ejected in the direction of the first opening 67. Accordingly, the first opening 67 is a virtual radius line 103 formed inward in the radial direction of the virtual arrangement circle 101 and a tangential direction of the virtual arrangement circle 101, and combustion air by the swirler 85, that is, a swirl flow The jet direction of the gas fuel through the first opening 67 is set within an angle range between the front direction 104 and a virtual tangent formed in the same direction.

  The second opening 68 has a central angle θ3 centered on the central axis 102 of the gas nozzle 65 with respect to the radius line 103 within a range of 90 ° to 180 °. In the present embodiment, the central angle θ3 is 108 degrees. Accordingly, the second opening 68 is directed in the forward direction 104 of the swirl flow in the opposite direction to the radial direction of the virtual arrangement circle 101 in a front view, and gas is ejected in the direction of the second opening 68. That is, a virtual radius line 103 formed radially outward of the virtual arrangement circle 101 by the second opening 68 and a combustion air by the swirler 85 in the tangential direction of the virtual arrangement circle 101, that is, a swirl flow The jet direction of the gas fuel through the second opening 68 is set within an angle range between the forward direction 104 and the virtual tangent formed in the same direction.

  As shown in FIGS. 9 and 10, 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 centered on the central axis 102 of the gas nozzle 65. They are directed in the radial direction, and 66, 67, 68 have the same diameter. As shown in FIG. 3, the pilot opening 66, the first opening 67, the second opening 68 and the third opening 69 are located in front of the front end opening surface 811 of the swirler 85.

  As shown in FIG. 10 and FIG. 11, a gas flame 65 has a main flame gas third opening (hereinafter referred to as a third opening) 69 that opens in the front end surface 652 of the gas nozzle 65. The third opening 69 has a central angle θ4 in the range of plus 45 degrees to minus 45 degrees on the outward radial line side with the center axis 102 as the center. In this embodiment, θ4 is 0 degrees. Accordingly, the third opening 69 is directed outward in the radial direction of the virtual arrangement circle 101 in a front view, that is, the virtual arrangement of the gas nozzle 65 from the tip of the gas nozzle 65 by the third opening 69. Gas is ejected in the radially outward direction of the circle 101.

  Then, approximately 40 percent of the total amount of all gas fuel ejected from the gas nozzle 65 is ejected from the third opening 69, and approximately 20 percent is ejected from the pilot opening 66, first and second openings 67, 68, respectively. The inner diameters of the openings 66 to 69 are set.

  As shown in FIG. 3, the pilot opening 66, the first opening 67, and the second opening 68 are directed to the downstream side of the recirculation region, to the inside, and parallel to the central axis 100, respectively, as viewed from the side. Inclined with respect to the axis 105. The inclination angle of the openings 66, 67, 68 with respect to the axis 105 is the largest in the pilot opening 66 and decreases in the order of the first opening 67 and the second opening 68. The third opening 69 is directed toward the downstream direction of the recirculation region, directed outward, and inclined with respect to the axis 105 parallel to the central axis 100.

In the burner device 30 that does not have the function addition device 71, when oil and gas co-firing is required, the function addition device 71 is incorporated as follows.
First, the attachment flange 43 at the tip of the register 32 is removed from the combustion chamber 90 of the boiler, and the burner device 30 is moved from a predetermined installation position to a work position. Then, the bolt 45 and the nut of the connecting flange 80 of the register 32 are removed, and the second portion 322 of the register 32 is separated from the first portion 321.

In this state, the single firing swirler 51 is replaced with the mixed firing swirler 85.
Next, one connecting flange 80 of the function adding device 71 is joined to the connecting flange 44 of the first portion 321 of the register 32, and the gas supply pipe 63 is protruded forward, and the gas nozzle 65 at the tip thereof is used for co-firing. It is located in the recess 56 of the swirler 85. In this way, the gas nozzle 65 of the gas supply pipe 63 is positioned around the atomizer 36. Then, the first portion 321 is positioned on the side of the function adding device 71 so that the gas supply pipe 63 is inserted into the first portion 321 of the register 32. In this state, the connecting flange 44 of the register 32 and the connecting flange 80 of the function adding device 71 are fixed by the bolt 45 and the nut.

  And the burner apparatus 30 is moved to the position by the side of the combustion chamber 90, and the attachment flange 43 is connected with a boiler. In this case, the burner device 30 is installed at a position where the function adding device 71 is interposed in the register 32 and retracted from before the function adding device 71 by the length of the register 32 being extended. Further, the main stay 35 having the atomizer 36 is moved forward by an amount corresponding to the length of the register 32 by the function adding device 71.

The operation of the burner device 30 incorporating the function adding device 71 will be described.
As described above, a swirl flow around the central axis 100 of the atomizer 36 flows from the register 32 through the swirler 51 into the flame holding region 33, and a recirculation flow that flows from the outside toward the central axis 100 is formed. The At this time, liquid fuel is sprayed from the atomizer 36 into the flame holding region 33 along the direction of the central axis 100, and the nozzle of the ignition burner, the pilot opening 66 and the first to third openings 67 to 69 of the gas nozzle 65. Gas fuel is ejected from Then, the flame from the nozzle of the ignition burner is propagated to the fuel from the atomizer 36 and the gas nozzle 65.

  At this time, a flame is formed in the recirculation flow accompanied by swirling by the swirler 51 at the center of the flame holding region 33. Therefore, mixing of air and fuel ejected from the atomizer 36 and the gas nozzle 65 is promoted. Thus, the fuel ejected from the atomizer 36 and the gas nozzle 65 can be stably and continuously burned by this flame.

The present embodiment has the following effects.
(1) The function adding device 71 includes a connecting portion 72 detachably connected to the cylindrical register 32 of the burner device 30. The connecting portion 72 is provided with a gas nozzle 65 disposed in the combustion region in the register 32, and an introduction pipe 83 for supplying gas to the gas nozzle 65 is provided on the outer peripheral side. Gas fuel is supplied from the introduction pipe 83 to the combustion region through the gas nozzle 65 in a state where the connection portion 72 is connected to the register 32. For this reason, by incorporating the function adding device 71 into the register 32, in addition to the combustion function by the atomizer 36, the combustion function by the gas nozzle 65 can be added, and the mixed combustion function can be added to the burner device 30.

  That is, in the assembled state of the function adding device 71, the atomizer 36 is provided on the central axis 100 of the flame holding region 33, and the gas nozzle 65 is provided around the atomizer 36. Can be used for oil and gas co-firing. In this case, the oil flame and the gas flame are sufficiently retained in the recirculation region, which is the negative pressure region formed by the swirler 51, and a stable flame is formed. Therefore, with oil and gas fuel, a high turndown ratio operation is possible in the mixed combustion operation, and a compact and stable flame can be formed. Of course, the same action can be obtained even if gas is supplied from both the atomizer 36 and the gas nozzle 65.

  (2) The connecting portion 72 is connected between the first portion 321 and the second portion 322 of the register 32 to constitute a part of the register 32, and has a gas supply pipe 63 having the gas nozzle 65 at the tip. An inner cylinder 75 to be supported and an intermediate cylinder 77 to support the introduction pipe 83 are provided while being positioned on the outer peripheral side of the inner cylinder 75 with the annular chamber 76 therebetween. Then, the gas from the introduction pipe 83 is supplied to the gas supply pipe 63 through the annular chamber 76. For this reason, gas is supplied without difficulty to the combustion section by the function addition device 71 having a compact structure.

  (3) Since the connecting flange 80 connected to the connecting flange 44 of the register 32 is provided on both sides of the connecting portion 72, the function adding device 71 can be easily connected to the register 32 by the bolt 45.

  (4) 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 85, and a pilot flame is formed by the gas fuel injected from the pilot opening 66. The The gas nozzle 65 is provided with first to third openings 67 to 69 into which gas fuel for forming a main flame is formed based on the pilot flame. Accordingly, unlike the conventional configuration, it is not necessary to separately provide a pilot gas nozzle and a main gas nozzle that supply gas fuel for pilot flame, and the configuration is simplified by reducing the number of parts and the device by reducing the diameter of the swirler 51. Can be reduced in size.

  (5) The jet direction of the gas fuel from the pilot opening 66 is set to be within a range of minus 45 degrees to plus 45 degrees in the radial direction center of the virtual arrangement circle 101 of the gas nozzle 65. According to this configuration, by supplying an appropriate amount of gas from the pilot opening 66 to the recirculation region formed by the swirler 51, a compact and stable pilot gas flame can be formed. Therefore, as described above, it is possible to contribute to the miniaturization of the entire burner apparatus for mixed combustion, and it is possible to obtain a burner apparatus for mixed combustion with low vibration.

  (3) In particular, the jet direction of the gas fuel from the pilot opening 66 is set to be the center of the virtual arrangement circle 101 in the radial direction. According to this configuration, an appropriate amount of gas can be supplied from the pilot opening 66 to the recirculation region formed by the swirler 51, and a stable pilot gas flame can be formed. In particular, this effect is significant in the gas-only firing operation.

  (4) In the side view shown in FIG. 3, the pilot opening 66 is directed forward and inwardly and recirculated from a position in front of the opening surface 511 of the combustion air outlet of the swirler 51. Gas was ejected toward the downstream position of the flow. For this reason, the gas fuel ejected from the pilot opening 66 is appropriately supplied to the recirculation region formed in the downstream portion of the swirler 51 or the vicinity thereof, and a stable gas flame is formed.

  (5) As described above, in a side view, the directivity angle of the pilot opening 66 is tilted forward and inward at a position in front of the opening surface 511 of the swirler 51 to a position downstream of the recirculation region. It opened so that gas might spout out. For this reason, the gas jet from the pilot opening 66 is wound inward from the outer periphery of the recirculation region, and the gas fuel is suitably mixed into the recirculation region. For this reason, a recirculation flow is not destroyed and a compact and stable flame is formed. On the other hand, in a side view, when the gas ejection direction from the pilot opening is made substantially inwardly perpendicular to the central axis 100, the gas jet passes through the recirculation region, and a part of this circulation flow is divided. Destroyed. In such a case, flame stability is hindered and the flame is likely to become unstable. In the present embodiment, occurrence of such a problem can be suppressed.

  (6) The front end of the gas nozzle 65 protrudes from the opening surface 511 toward the flame holding region 33. Therefore, as is apparent from FIG. 3, the pilot opening 66 and the first to third openings 67, 68, 69 are easily provided at an effective position for facilitating the entrainment of the gas fuel into the recirculation region from the outer peripheral side. Can be arranged. Therefore, it can contribute to the formation of a compact and stable flame.

  (7) Since the pilot opening 66 is opened on the outer peripheral surface 651 of the gas nozzle 65, it is easy to direct the pilot opening 66 in an inclined state toward the downstream in the direction of the central axis 100 in order to stabilize the flame. Effective and easy contribution to the formation of a compact and stable flame.

  (8) A radial line formed inward in the radial direction of the virtual arrangement circle 101 of the gas nozzle 65 by the first opening 67 and a tangential direction of the virtual arrangement circle 101, and the combustion air generated by the swirler 51. The gas fuel ejection direction is set within an angular range between a virtual tangent formed in the same direction as the turning 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. Without extending, it is possible to form a stable pilot gas flame in a compact form.

  (9) The second opening 68 is the same as the virtual radial line formed outward in the radial direction of the virtual arrangement circle 101 and the tangential direction of the virtual arrangement circle 101 and the swirling direction of the combustion air by the swirler 51 It is oriented within the angular range between the virtual tangent formed in the direction. Accordingly, gas is supplied from the second opening 68 toward the recirculation region so as to surround the gas ejection region from the first opening 67. For this reason, it is possible to form a main flame that is compact and stable in the same manner as described above.

  (10) The third opening 69 is opened at the tip of the gas nozzle 65 outward in the radial direction of the virtual arrangement circle 101 of the gas nozzle 65 and in the direction of the recirculation region in a side view. Accordingly, gas is supplied to the air flow outside the swirler 51 to form a flame surrounding the outside of the recirculation region. For this reason, the whole flame holding area | region 33 can be utilized effectively, and the flame which was united can be formed. Therefore, a compact flame can be formed with high efficiency, and a burner device capable of high-efficiency operation can be realized without increasing the size.

  (11) The gas nozzle 65 is positioned so as to cut into the center side of the outer shape of the swirler 51. Therefore, it becomes easy to mix into the recirculation region formed in the front side of the pilot gas straw. In addition, the outer shape of the burner device for co-firing is reduced, and the size can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described based on FIGS. 14 to 22 with a focus on differences from the first embodiment.

First, the configuration of the burner device 30 will be described. The burner device 30 is different in configuration from the burner device 30 in the first embodiment.
That is, as shown in FIGS. 14 and 15, a buffer chamber 315 is provided in an air box (not shown), and an introduction pipe 83 connected to a gas supply source (not shown) is provided on the rear wall. It is connected. Gas is supplied to the buffer chamber 315 through the introduction pipe 83. An outer chamber 316 is adjacent to the rear portion of the buffer chamber 315, and a suction tube 84 connected to a suction device (not shown) is connected to the outer chamber 316. Then, the gas leaked into the outer chamber 316 is sucked through the suction pipe 84. The wind box is provided between the rear flange 318 and the front connecting flange 44.

  A register 32 is supported by a support ring 323 as a flange at the base end via a plurality of stays 50 on the front wall of the support portion 317 on the outer peripheral side of the buffer chamber 315. The register 32 includes a first portion 324 and a second portion 325 as in the first embodiment, and both the portions 324 and 325 are connected to each other at the connecting flange 44 by a bolt 45 and a nut (not shown). The support ring 323 is attached to the first portion 324. As shown in FIGS. 15 and 16, an annular swirler (hereinafter referred to as an outer swirler) 91 is provided at the front end of the second portion 325. The outer swirler 91 includes an outer peripheral ring 92 constituting the front end of the second portion 325, an inner peripheral ring 93, and a plurality of spiral blades positioned between the inner peripheral ring 93 and the outer peripheral ring 92. 94.

  As shown in FIG. 15, the main stay 35 that supports the atomizer 36 at the tip is supported in a state of penetrating the buffer chamber 315. As with the burner device 30 in which the first embodiment is implemented, the atomizer 36 is supplied with liquid fuel via an oil supply pipe 38 and is a spray medium made of a pressure gas such as steam via an air supply pipe 37. Is supplied. As the liquid fuel, A heavy oil, B heavy oil, C heavy oil, kerosene, light oil, alcohol, biofuel and the like are used as in the burner device 30 in which the first embodiment is implemented. Then, the liquid fuel ejected from the jet opening at the tip of the atomizer 36 is atomized by the pressure gas from the jet opening at the tip of the atomizer 36 and ejected to the center of the flame holding region 33 (see FIG. 19). The

  As shown in FIGS. 15 and 16, an annular gap 95 is provided between the mixed swirler (hereinafter referred to as an inner swirler in this embodiment) 85 supported by the main stay 35 and the outer swirler 91. Is formed. The inner swirler 85 includes an attachment portion 52, a plurality of spiral blades 53, and a guide ring 54 positioned at the tip of the blades 53, similar to the mixed combustion swirler 85 of the first embodiment. The blades 53 and 94 of the inner swirler 85 and the outer swirler 91 are directed in the same direction, and both cooperate to generate a swirling flow toward the same direction.

The ignition burner 96 protrudes forward through a notch 851 of the inner swirler 85.
As shown in FIGS. 15, 17, and 18, five gas supply pipes 97 and 98 are supported at equal intervals on the inner peripheral side and the outer peripheral side of the front wall of the buffer chamber 315, respectively. Gas nozzles (hereinafter referred to as an outer peripheral nozzle and an inner peripheral nozzle) 88 and 99, respectively, are attached to the tips of the nozzles. The outer peripheral nozzle 99 is thicker than the inner peripheral nozzle 88 and has the same configuration as the gas nozzle 65 of the first embodiment, and the arrangement of the openings such as the pilot openings 66 of the outer peripheral nozzle 99 is also the gas nozzle 65 of the first embodiment. It is the same. As shown in FIGS. 17 and 19, the inner peripheral nozzle 88 has a single opening 881 on the peripheral surface of the tip. The opening 881 points in the center direction on the radial line 103 with the atomizer 36 as the center, and points in the direction within an angle range of 30 to 60 degrees with respect to the center axis 100 toward the front.

  The outer peripheral nozzle 99 is disposed in the gap 95, and the inner peripheral nozzle 88 projects forward through the notch 851 of the blade 53 of the inner swirler 85. The gas from the buffer chamber 315 is supplied to the nozzles 88 and 99 through the gas supply pipes 97 and 98, and is ejected toward the combustion chamber 90 from the openings 66 and the like of the nozzles 88 and 99.

The burner device 30 of this embodiment operates as follows.
As apparent from FIG. 19, the air from the inside of the wind box 31 passes through the resistor 32, passes through the gap 95 and the inside and outside swirlers 85 and 91, and includes the flame holding region 33 from the front end opening surface of the swirler 85 and 91. It flows as a swirl flow around the axis 100 in the combustion chamber 90 and also becomes a recirculation flow that flows from the outside toward the center axis 100 in the combustion chamber 90. Then, liquid fuel is sprayed from the atomizer 36 into the flame holding region 33 along the direction of the central axis 100, and the fuel is ignited by the igniter in the ignition burner. Then, the flame is propagated to the fuel from the atomizer 36. For this reason, a flame with the swirl flow and the recirculation flow is formed. In this state, gas is ejected from the inner and outer nozzles 88 and 99, a flame is formed in the combustion chamber 90 together with the recirculation flow, and the boiler is heated.

  In this burner device 30, since the inner peripheral side gas nozzle 88 is provided in addition to the outer peripheral side nozzle 99, the amount of gas supplied to the combustion chamber 90 increases, and therefore the first embodiment is implemented. It is suitable as a burner device 30 for a boiler having a larger capacity than the burner device 30.

  Next, the function addition apparatus 71 shown in FIGS. 20-22 and its related structure are demonstrated. In this case, in the state in which the function addition device 71 is incorporated in the burner device 30, these configurations will be described. The function adding device 71 of the present embodiment is suitable for implementation in the medium-sized and large-sized burner devices 30.

  As shown in FIGS. 16 and 18, an inner swirler 85 of another shape having the same function is attached to the main stay 35 in a detachable manner with a bolt 45 in place of the inner swirler 85. However, the inner swirler 85 has an increased number of notches 851 for the inner peripheral nozzle 88.

  As shown in FIGS. 5 to 7, the function adding device 71 is one in which the first portion 324 of the register 32 is removed and attached to that portion. That is, the function addition device 71 is configured by a connection unit 72, an introduction unit 73, and a supply unit 74.

  The connection portion 72 of the function adding device 71 includes an inner cylinder 75 as a connection cylinder having the same diameter as the register 32 and an outer cylinder 79 positioned on the outer peripheral side of the inner cylinder 75, and both the cylinders 75, 79 are provided. An annular chamber 76 as a supply chamber is formed between them. The connecting portion 72 includes a connecting flange 80 and a support ring 323 that are welded to the side ends of the cylinders 75 and 79. The connection flange 80 and the support ring 323 are provided with holes (not shown) through which the bolts 45 are passed. The connection flange 80 is joined to the connection flange 44 of the register 32, and the support ring 323 is fixed by the bolt 45 in a state where the support ring 323 is joined to the wind box 31.

  A plurality of inner and outer gas supply pipes 971 and 981 constituting the supply portion 74 (5 in each embodiment, outside and inside) are fixed to the inner cylinder 75 at the base end portion and connected to the annular chamber 76. Has been. The base end portion 64 is bent at 90 degrees by an arc-shaped bent portion, and the distal ends of the gas supply pipes 971 and 981 are arranged in parallel by this bending. Further, nozzles 88 and 99 as fuel nozzles are detachably fixed to the tips of the gas supply pipes 971 and 981 through screws.

  These nozzles 88 and 99 of the function adding device 71 are alternately arranged with the existing nozzles 88 and 99 of the burner device 30. The outer peripheral side nozzles 99 are arranged between the existing nozzles 99 in the gap 95, and as shown in FIG. 9, the outer peripheral side nozzles 99 of the burner device 30 and the function adding device 71 have the central axis 100. They are arranged at substantially equal pitches spaced apart from each other on the virtual arrangement circle 101 at the center. The inner gas nozzles 88 are arranged in the notches 851 in the inner swirler 85 so as to be adjacent to the existing gas nozzles 88, and each gas nozzle 88 is arranged on a virtual arrangement circle 106 centered on the central axis 100. ing. The inner peripheral side nozzle 88 and the outer peripheral side nozzle 99 of the function adding device 71 have the same configuration as the existing nozzles 88 and 99, and each opening is also arranged in the same direction.

The front ends of the nozzles 88 and 99 protrude from the opening surfaces 511 of the swirlers 85 and 91 toward the combustion chamber 90.
An introduction pipe 183 constituting the introduction part 73 is fixed to the annular chamber 76, and the introduction pipe 183 communicates with a gas supply source (not shown). The gas from the introduction pipe 83 is ejected from the openings of the nozzles 88 and 99 toward the combustion chamber 90 through the annular chamber 76 and the gas supply pipes 971 and 981.

  The function of the burner device 30 in which the function adding device 71 is incorporated is that the amount of gas supplied to the combustion chamber 90 increases as the number of outer peripheral side and inner peripheral side nozzles 88 and 99 increases. Capability can be improved.

In this embodiment, in addition to the effects of the first embodiment, there are the following effects.
(12) Since the outer peripheral nozzle 99 and the inner peripheral nozzle 88 are provided in the function adding device 71, a large amount of fuel gas can be supplied into the combustion chamber 90, which is suitable for implementation in the medium-sized and large-sized burner devices 30. It is.

  (13) If the function adding device 71 is attached to the burner device 30, in addition to the existing nozzles 88 and 99, 10 inner and outer nozzles 88 and 99 are equipped. Therefore, it can function as a burner device for co-firing that burns different types of fuel.

(Example of change)
The present invention is not limited to the embodiment described above, and may be embodied in the following modifications.

  -In 1st, 2nd embodiment, the register | resistor 32 of the integral structure which is not divided into 2 may be cut | disconnected so that it may be divided into 2, and the function addition apparatus 71 may be interposed between the cut | disconnected division pieces.

  -In 1st Embodiment, although the function addition apparatus 71 was connected to the register | resistor 32 by the connection of the connection flange 44 and the flange 80, you may employ | adopt another connection structure. For example, as shown in FIG. 13, a side plate 86 may be provided at the same position instead of the connecting flange 80, and the side plate 86 may be fixed to the first portion 321 and the second portion 322 of the register 32 by welding 87 or the like.

  In the first and second embodiments, the fuel is discharged from the atomizer 36 and the gas fuel is discharged from the gas nozzle 65 to form a flame. However, the structure of the atomizer 36 and the gas nozzle 65 is appropriately changed and burned. The fuel to be changed may be changed. In other words, the supply position of oil fuel and gas fuel from the center and its surroundings with respect to the combustion region is exchanged, the fuel supplied from the center and its surroundings is only oil fuel, or conversely only gas fuel is used. about. In this way, a new combustion function such as a different combustion mode and combustion amount can be added to the burner device 30.

  In the first and second embodiments, the gas nozzle 65 is formed in a cylindrical shape, and the cross-sectional shape thereof is formed in a circular shape. However, the present invention is not limited to this, and the gas nozzle 65 may have a rectangular tube shape so that the gas nozzle 65 is formed in a polygonal shape such as a pentagon, hexagon, or octagon.

  -In 1st Embodiment, the recessed part 56 is formed in the outer periphery of the swirler 51, and the gas nozzle 65 is arrange | positioned from the outer diameter position of the swirler 51 in the center side of radial direction. The radial position of the swirler 51 of the gas nozzle 65 may be displaced closer to the center than in the first embodiment, and penetrates the blade 53 of the swirler 51 at a position closer to the center side from the outer diameter position. May be. Alternatively, the arc of the concave portion 56 may be shallowed so as to be displaced to the outer diameter side of the swirler 51 from the above-described embodiment, or may be disposed outward from the outer diameter position of the swirler 51. Moreover, in 2nd Embodiment, a recessed part is formed in the outer periphery of the inner side swirler 85, a nozzle is arrange | positioned inside it, or a recessed part is formed in the inner periphery of the outer side swirler 91, and a nozzle is arrange | positioned inside it. .

  In the first and second embodiments, the atomizer 36 is a steam spray type, but may be a two-fluid injection atomizer such as a pressure air spray atomizer. Further, a gas ejection type atomizer that does not use an atomizing medium may be used.

The number of nozzles 88 and 99 of the function adding device 71 is not limited to 5 units. Any number of 2-4, 6 or more is possible.
A plurality of pilot flame gas openings may be provided so as to be located within the central angle θ1.

  In the first and second embodiments, the tip of the nozzle 65 protrudes from the opening surface 511 of the swirler 51 toward the flame holding region 33, but it does not have to be protruded. Even if comprised in this way, since the nozzle 65 is located on the outer periphery of the swirler 51, the pilot opening 66 and the first to third openings 67, 68, 69 can be arranged.

  In the first and second embodiments, the pilot opening 66, the first and second openings 67, 68 have the same diameter, but the diameters of these openings 66, 67, 68 and the third opening 69 are various. For example, 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 swirl swirl strength, and the like. Therefore, the ratio of the amount of gas fuel ejected from each opening 66, 67, 68, 69 is also set appropriately according to various conditions.

-In 2nd Embodiment, the 2nd part 322 which is the front part side of the register | resistor 32 is removed, and the function addition apparatus 71 is provided there.
The function adding device 71 may be incorporated into a new burner device in the manufacturing process instead of the existing burner device.

(Other technical ideas)
The technical idea grasped from the embodiment is as follows.
(A) In the burner device provided with the function addition device according to any one of claims 1 to 3 in a register having a cylindrical shape and a flame holding region formed at a tip position.
A burner device provided with a function addition device in which a gas opening for pilot flame formed at the tip of the fuel nozzle is ejected toward a position downstream of an opening surface on the flame holding region side of the swirler.

If it does in this way, the gas fuel injected from the gas injection opening part will mix moderately with respect to the negative pressure area | region formed in the downstream part of a swirler, and the stable gas flame will be formed.
(B) The pilot flame gas opening is a burner device provided with the function adding device described in the above item (A), in which the gas ejection direction is inclined toward the central axis side with respect to the axial downstream direction.

In this way, since the gas jet is wound inward from the outer periphery of the circulation region, the gas fuel is suitably mixed into the circulation region without destroying the circulation flow, and a stable flame is formed.
(C) The function addition device according to any one of claims 1 to 3, wherein the pilot flame gas opening is located on an outer peripheral surface of the gas nozzle, and the (A) and (B) items are provided. Burner device.

  (D) The gas opening for the main flame is an inward radial line of the virtual arrangement circle of the gas nozzle and a tangent line of the virtual arrangement circle, and a virtual tangent in the same direction as the swirling direction of the combustion air by the swirler The burner apparatus which provided the function addition apparatus as described in any one of Claims 1-3 and the said (A)-(C) term which has set the ejection direction of gas fuel in the angle range between.

  (E) The main flame gas opening is the same as the virtual radial line formed outward in the radial direction of the gas nozzle virtual arrangement circle and the tangential direction of the virtual arrangement circle and the swirling direction of the combustion air by the swirler The function addition according to any one of claims 1 to 3 and (A) to (D), wherein the jet direction of the gas fuel is set within an angular range between a virtual tangent formed in a direction. Burner device with device.

  (F) The gas opening for main flame is opened to the front-end | tip part of a gas nozzle in the radial direction outward of the virtual arrangement | positioning circle | round | yen of a gas nozzle, Any of the said (A)-(E) term A burner device provided with the function adding device according to claim 1.

  (G) The swirler is formed with a recess positioned on the swirler center side with respect to the outer diameter thereof, and a gas nozzle is disposed in the recess. Any one of the items (A) to (F) A burner device provided with the function adding device according to claim 1.

(H) A burner device provided with the function adding device according to any one of claims 1 to 3 and (A) to (G), wherein a tip of a gas nozzle is formed in a conical shape.
(I) A burner device provided with the function addition device according to any one of claims 1 to 3 and (A) to (G), wherein the tip of the gas nozzle is spherical.

  (J) The pilot flame hole and the main flame hole are opened on the outer peripheral surface of the gas nozzle, and the openings are opened in the radial direction from the central axis of the gas nozzle. A burner device provided with the function adding device according to any one of items (I) to (I).

  (H) In a burner apparatus having a register having a cylindrical shape and a flame holding region formed at the tip position, the register is divided into a first part and a second part in the length direction thereof, and The burner apparatus which provided the connection part for mutually connecting to the contact part of 1 part and 2nd part.

If comprised in this way, a function addition apparatus can be easily interposed between a 1st part and a 2nd part using the said connection part.
(I) In a burner apparatus having a register having a cylindrical shape and a flame holding area formed at the tip position, the register is divided into a first part and a second part in the length direction thereof, and A burner device provided with a function adding device in exchange for one part or the second part.

  If comprised in this way, a function addition apparatus can be attached simply and well.

  DESCRIPTION OF SYMBOLS 30 ... Burner apparatus, 31 ... Combustion apparatus, 32 ... Register, 33 ... Throat, 37 ... Primary fuel nozzle, 52 ... Secondary fuel nozzle, 62 ... Secondary air nozzle, 71 ... Function addition apparatus, 72 ... Connection part, 80 ... Flange, 83 ... Introducing pipe, 100 ... Axis, 183 ... Introducing pipe, 318 ... Flange.

Claims (3)

A connecting portion detachably provided on a cylindrical register portion of the burner device;
A fuel nozzle supported by the connection and disposed in a combustion region in the register;
Provided on the outer peripheral side of the connecting portion, and provided with an introduction pipe communicating with the fuel nozzle,
A function adding device for a burner device that enables fuel to be supplied from the introduction pipe to the combustion region through a fuel nozzle in a state where the connection portion is connected to the register. The connecting portion is
A connecting cylinder that is connected to the register and constitutes a part of the register, supports a fuel pipe having the fuel nozzle at the tip, and is positioned on the outer peripheral side of the connecting cylinder across a supply chamber, and the introduction pipe And an outer cylinder connected to each other,
The function addition device for a burner device according to claim 1, wherein fuel from the introduction pipe is supplied to the fuel pipe through the supply chamber.   The function addition device for a burner device according to claim 1, wherein flanges connected to the flanges of the register are provided on both sides of the connection portion.

Images