WO2019146154A1 - Combustion burner, combustion device, and boiler - Google Patents

Combustion burner, combustion device, and boiler Download PDF

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Publication number
WO2019146154A1
WO2019146154A1 PCT/JP2018/033436 JP2018033436W WO2019146154A1 WO 2019146154 A1 WO2019146154 A1 WO 2019146154A1 JP 2018033436 W JP2018033436 W JP 2018033436W WO 2019146154 A1 WO2019146154 A1 WO 2019146154A1
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WO
WIPO (PCT)
Prior art keywords
fuel gas
flame
flame stabilizing
stabilizing member
fuel
Prior art date
Application number
PCT/JP2018/033436
Other languages
French (fr)
Japanese (ja)
Inventor
史也 山根
啓吾 松本
竜平 高島
幸洋 冨永
泰仁 大西
田中　隆一郎
川元　昇
岩田　隆
慎一 関口
Original Assignee
三菱日立パワーシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱日立パワーシステムズ株式会社 filed Critical 三菱日立パワーシステムズ株式会社
Priority to CN201880086613.8A priority Critical patent/CN111602005B/en
Publication of WO2019146154A1 publication Critical patent/WO2019146154A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74—Preventing flame lift-off

Definitions

  • the present invention relates to a combustion burner which mixes and burns fuel and air, a combustion device which forms a flame flow by the combustion burner, and a boiler which generates steam by combustion gas generated by the combustion device.
  • the conventional boiler has a hollow shape and has a vertically installed furnace, and a plurality of combustion burners are arranged circumferentially and vertically on the furnace wall. And a flue is connected with the upper part of this furnace, and the heat exchanger for collecting the heat of exhaust gas and producing steam is arranged in this flue.
  • the combustion burner is supplied with a mixture of pulverized fuel and pulverized primary fuel such as coal, and is supplied with high temperature secondary air, and this mixture and the secondary air are blown into the furnace. Form a flame.
  • Patent Document 1 As a combustion burner applied to such a boiler, there is, for example, one described in Patent Document 1 below.
  • the combustion burner described in Patent Document 1 is provided with a pulverized coal burner, a coal primary port, a coal secondary port, and a split member, and the split member collides with the pulverized coal concentrated stream to be stable in a wide load range. Enables low NOx combustion.
  • some embodiments of the present invention aim to improve the workability of maintenance work for a fuel nozzle.
  • a combustion burner comprises a fuel nozzle for spouting a fuel gas in which fuel and air are mixed, a combustion air nozzle for spouting air from the outside of the fuel nozzle, and a spout of the fuel nozzle
  • a first flame stabilizing member disposed on the upstream side of the fuel gas ejection direction from the opening to widen the fuel gas ejection direction, and the fuel gas ejection direction downstream of the first flame holding member and the first flame stabilizing member
  • a second flame holding member disposed adjacent to the flame holding member to widen the jet direction of the fuel gas, wherein at least one of the first flame holding member and the second flame holding member is of fuel gas. It is characterized by having only a widening portion which widens toward the downstream side in the flow direction.
  • At least one of the first flame stabilizing member and the second flame stabilizing member can be miniaturized, and a working space is secured in the fuel nozzle. Therefore, maintenance work such as cleaning, repair, and replacement of the flame stabilizing member can be performed using this work space portion, and the workability of the maintenance work of the fuel nozzle can be improved.
  • the first flame stabilizing member includes only a first widening portion that widens toward the downstream side of the flow direction of the fuel gas
  • the second flame stabilizing member The member is characterized by having a second widening portion which widens toward the downstream side in the flow direction of the fuel gas, and a second flat portion connected to the upstream side in the flow direction of the fuel gas from the second widening portion.
  • the working space portion can be secured inside the fuel nozzle by forming the first flame stabilizing member with only the first widening portion. Therefore, the flame stabilizing member can be accessed from the base end side of the fuel nozzle through the working space, and maintenance work such as cleaning, repair, and replacement of the flame stabilizing member can be easily performed.
  • the first flame stabilizing member is a first widening portion that widens toward the downstream side of the flow direction of the fuel gas, and a fuel gas from the first widening portion And a first flat portion connected to the upstream side in the flow direction, and the second flame stabilizing member has only a second widening portion that widens toward the downstream side in the flow direction of the fuel gas.
  • the first and second flame stabilizing members can be accessed from the base end side of the fuel nozzle through the working space portion. it can. Therefore, maintenance work such as cleaning, repair and replacement of the flame stabilizing member can be easily performed.
  • a plurality of the first flame stabilizing members are provided at predetermined intervals in the horizontal direction or the vertical direction, and the second flame stabilizing members are the first flame retaining members.
  • a predetermined spacing is provided on both sides of the flame member on the inner wall side of the fuel nozzle, and a third flame holding member is disposed between the plurality of first flame holding members, and the third flame holding member is a fuel It is characterized in that only the third widening portion which widens toward the downstream side in the gas flow direction is provided.
  • first and second flame stabilizing members can be accessed from the central portion through the working space portion from the proximal end side of the fuel nozzle. Therefore, maintenance work such as cleaning, repair and replacement of the flame stabilizing member can be easily performed.
  • the first flame stabilizing member includes only a first widening portion that widens toward the downstream side of the flow direction of the fuel gas, and the second flame stabilizing member The member is characterized by having only the second widening portion which widens toward the downstream side in the flow direction of the fuel gas.
  • the first and second flame stabilizing members can be formed from the base end side of the fuel nozzle through the working space portion. It can be accessed. Therefore, maintenance work such as cleaning, repair and replacement of the flame stabilizing member can be easily performed.
  • the second flame stabilizing member is disposed on both sides in the widthwise direction of the first flame stabilizing member, and the first flame stabilizing member is configured to eject a fuel gas.
  • the first widening portion which widens the direction in two directions is provided, and the second flame stabilizing member disposed on the inner wall surface side of the fuel nozzle has a jet direction of fuel gas only on the axial center side of the fuel nozzle. It is characterized in that the second widening portion which widens is provided.
  • the fuel gas spreads in at least two directions by the first flame stabilizing member to form the recirculation region, and spreads only to the first flame stabilizing member side by the second flame stabilizing member to form the recirculation region
  • the external flame holding in the fuel nozzle can be suppressed, and the amount of NOx generation can be reduced.
  • a plurality of the combustion burners are disposed circumferentially at predetermined intervals to form a flame swirl flow.
  • the flame stabilizing member in each combustion burner, can be accessed from the base end side of the fuel nozzle through the working space, and maintenance work such as cleaning, repair, replacement of the flame stabilizing member can be performed. It can be easily implemented.
  • a boiler according to at least one embodiment of the present invention is characterized by including a furnace having a hollow shape and installed along a vertical direction, and the combustion device.
  • the flame holding member can be accessed from the base end side of the fuel nozzle through the working space, and maintenance such as cleaning, repair, replacement of the flame holding member Work can be easily carried out.
  • the workability of the maintenance operation of the fuel nozzle can be improved.
  • FIG. 1 is a front view showing the configuration of an embodiment of a combustion burner according to some embodiments.
  • FIG. 2 is a horizontal sectional view (II-II sectional view of FIG. 1) showing the configuration of one embodiment of the combustion burner according to some embodiments.
  • the combustion burner 21 is provided with a fuel nozzle 61, a combustion air nozzle 62, and a secondary air nozzle 63 from the center side, and the flame holding in the fuel nozzle 61.
  • a vessel 64 is provided.
  • the fuel nozzle 61 is capable of spouting a pulverized fuel mixture (hereinafter referred to as fuel gas) 301 in which pulverized coal (solid fuel) and transport air (primary air) are mixed.
  • the combustion air nozzle 62 is disposed outside the fuel nozzle 61, and can eject part of the combustion air (air for fuel gas combustion) 302 to the outer peripheral side of the fuel gas 301 ejected from the fuel nozzle 61. is there.
  • the secondary air nozzle 63 is disposed outside the combustion air nozzle 62, and a part of the combustion air (hereinafter, secondary air) on the outer peripheral side of the fuel gas combustion air 302 jetted from the combustion air nozzle 62 It is possible to spout 303.
  • the flame holder 64 is disposed inside the fuel nozzle 61 and at the tip of the fuel nozzle 61, that is, on the downstream side in the flow direction of the fuel gas 301, and thus for ignition and flame holding of the fuel gas 301. It functions as a member.
  • the flame stabilizer 64 is composed of two first flame stabilizing members 71, two second flame stabilizing members 72, and one third flame stabilizing member 73.
  • the first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 are disposed along the flow direction of the fuel gas 301 and along the vertical direction, and at predetermined intervals in the horizontal direction. It is arranged.
  • the first flame stabilizing member 71 is a tip end portion of the fuel nozzle 61, and both sides in the radial direction (in the fuel nozzle 61) with respect to a center line O along the ejection direction of the fuel gas 301 (center line of the fuel nozzle 61). It is disposed on the wall surface 61a side and spaced from the inner wall surface 61a of the fuel nozzle 61 by a predetermined distance (a gap), and has a plate shape along the vertical direction and along the ejection direction of the fuel gas 301.
  • the second flame stabilizing member 72 is a tip end portion of the fuel nozzle 61, and has a predetermined interval (a gap) on both sides (the inner wall surface 61a side of the fuel nozzle 61) in the horizontal direction with respect to each first flame stabilizing member 71. And a predetermined interval (space) from the inner wall surface 61a of the fuel nozzle 61, and has a plate shape along the vertical direction and along the ejection direction of the fuel gas 301.
  • the third flame stabilizing member 73 is a tip end portion of the fuel nozzle 61, and on the center line O (center line of the fuel nozzle 61) along the ejection direction of the fuel gas 301, and from each first flame stabilizing member 71 It is disposed at a predetermined interval (gap), and has a plate shape along the vertical direction and along the ejection direction of the fuel gas 301.
  • the fuel nozzle 61 and the combustion air nozzle 62 have an elongated tubular structure.
  • the fuel nozzle 61 forms a fuel gas flow path P1 extending in the longitudinal direction and having the same flow path cross-sectional shape by four flat inner wall surfaces 61a, and has a rectangular shape at the tip end (downstream end).
  • the opening 61 b of the The combustion air nozzle 62 extends in the longitudinal direction by the four flat outer wall surfaces 61 c of the fuel nozzle 61 and the four flat inner wall surfaces 62 a so as to have the same flow channel cross-sectional shape P 2
  • a rectangular ring-shaped opening 62b is provided at the tip (downstream end). Therefore, the fuel nozzle 61 and the combustion air nozzle 62 have a double tubular structure.
  • the secondary air nozzle 63 has an elongated tubular structure disposed outside the fuel nozzle 61 and the combustion air nozzle 62.
  • the secondary air nozzle 63 has a tubular structure having four rectangular cross-sectional shapes, and is a secondary air nozzle main body 63a, 63b, disposed independently above, below, to the left, to the right of the combustion air nozzle 62. 63c and 63d and is disposed outside the combustion air nozzle 62 with a predetermined gap.
  • the secondary air nozzles 63 extend in the longitudinal direction by the four secondary air nozzle bodies 63a, 63b, 63c, 63d, and have four secondary air flow paths P31, P32, P33 having the same flow passage cross sectional shape. , P34, and a rectangular ring-shaped opening 63e is provided at the tip (downstream end).
  • the shapes of the fuel nozzle 61 and the combustion air nozzle 62 are not limited to square, and may be rectangular. In this case, the corner may be curved.
  • the strength of the nozzle can be improved by forming a tubular structure in which the corners are curved. Furthermore, it may be a cylinder.
  • the opening 62b of the combustion air nozzle 62 (combustion air flow path P2) is disposed outside the opening 61b of the fuel nozzle 61 (fuel gas flow path P1), and this combustion air nozzle 62 (for combustion An opening 63e of the secondary air nozzle 63 (secondary air flow path P3) is disposed at a predetermined interval outside the opening 62b of the air flow path P2).
  • the fuel nozzle 61, the combustion air nozzle 62, and the secondary air nozzle 63 are arranged such that the openings 61b, 62b, and 63e are aligned at the same position in the flow direction of the fuel gas 301 and the air.
  • the secondary air nozzle 63 may be disposed in a rectangular shape as a double tubular structure outside the combustion air nozzle 62 without being configured by the four secondary air nozzle bodies 63a, 63b, 63c, 63d. Good. Further, although the secondary air nozzle 63 is configured by the secondary air nozzle main bodies 63a, 63b, 63c, 63d, only the upper and lower secondary air nozzle main bodies 63a, 63b are used, and the left and right secondary air nozzle main bodies 63c, 63d You may leave it alone. Furthermore, the secondary air nozzle 63 may adjust the ejection amount of the secondary air 303 by providing a damper opening degree adjustment mechanism or the like in each of the secondary air nozzle bodies 63a, 63b, 63c, 63d.
  • the first flame stabilizing member 71 has a first widening portion 82 whose width is expanded toward the downstream side of the flow direction of the fuel gas 301 in a cross-sectional shape (FIG. 2) broken along the horizontal direction.
  • the 1 widening portion 82 has a triangular prism shape.
  • the first wide part 82 has a horizontal cross section in the form of a substantially isosceles triangle, and is inclined inward in the width direction (the center line O side of the fuel nozzle 61) and the outside in the width direction (fuel It has a second guide surface 82b inclined to the inner wall surface 61a side of the nozzle 61, and an end surface 82c orthogonal to the flow direction of the fuel gas 301 on the front end side.
  • the flow of the fuel gas 301 is separated at the corner formed by the guide surfaces 82a and 82b and the end surface 82c.
  • the width of the first widening portion 82 is constant along the vertical direction, but the width may be different.
  • the first guide surface 82a, the second guide surface 82b, and the end surface 82c are preferably flat surfaces, but may be surfaces bent or curved in a concave or convex shape.
  • the second flame stabilizing member 72 has a second flat portion 83 having a constant width and a front end portion of the second flat portion 83 (a flow of the fuel gas 301) in a sectional shape (FIG. 2) broken along the horizontal direction. And a second widening portion 84 integrally provided at the downstream end in the direction.
  • the second flat portion 83 has a constant width along the flow direction of the fuel gas 301.
  • the second widening portion 84 increases in width in the flow direction of the fuel gas 301.
  • the second widening portion 84 has a horizontal cross section in a substantially isosceles triangle shape, the base end portion is connected to the second flat portion 83, and the tip end portion is wide toward the downstream side in the flow direction of the fuel gas 301
  • the front end is a plane perpendicular to the flow direction of the fuel gas 301. That is, the second widening portion 84 has a first guide surface 84a inclined to the inside in the width direction (the center line O side of the fuel nozzle 61) and an end surface 84c on the front end side. There is no guide surface on the inner wall surface 61a side of the fuel nozzle 61, and the end surface of the second flat portion 83 is a flat surface.
  • the flow of the fuel gas 301 is separated at the corner formed by the guide surface 84 a and the end surface 84 c.
  • the width of the second widening portion 84 is constant along its longitudinal direction (vertical direction), but may be different. By making the second widening portion 84 smaller, the internal ignition can be relatively strengthened.
  • the first guide surface 84 a and the end surface 84 c are preferably flat surfaces, but may be surfaces bent or curved in a concave or convex shape.
  • the third flat holding member 73 has a third flat portion 85 having a constant width and a front end portion of the third flat portion 85 (a flow of the fuel gas 301) in a sectional shape (FIG. 2) broken along the horizontal direction. And a third widening portion 86 integrally provided at the downstream end in the direction.
  • the third flat portion 85 has a constant width along the flow direction of the fuel gas 301.
  • the third widening portion 86 increases in width in the flow direction of the fuel gas 301.
  • the third widening portion 86 has a substantially isosceles triangular horizontal cross section, the base end portion is connected to the third flat portion 85, and the tip end portion is wide toward the downstream side in the flow direction of the fuel gas 301
  • the front end is a plane perpendicular to the flow direction of the fuel gas 301. That is, the third widening portion 86 includes a first guide surface 86a inclined to the one first flame stabilizing member 71 side, a second guide surface 86b inclined to the other first flame stabilizing member 71 side, and a front end side. And an end face 86c.
  • the flow of the fuel gas 301 is separated at the corner formed by the guide surfaces 86a and 86b and the end surface 86c.
  • the width of the third widening portion 86 is constant along the longitudinal direction (vertical direction), but the width may be different.
  • the first guide surface 86a, the second guide surface 86b, and the end surface 86c are preferably flat surfaces, but may be surfaces bent or curved in a concave or convex shape.
  • the first flame stabilizing member 71, the second flame stabilizing member 72, the third flame stabilizing member 73, and the inner wall surface 61a of the fuel nozzle 61 are arranged with a predetermined gap therebetween.
  • this predetermined interval means a gap equal to or greater than the width of the widened portions 82, 84, 86 of the flame stabilizing members 71, 72, 73, or at least the widened portions 82, 84, 86 of the flame stabilizing members 71, 72, 73.
  • first, second and third flame stabilizing members 71, 72 and 73 as the flame stabilizer 64 are disposed at predetermined intervals in the width direction (horizontal direction).
  • the second and third flame stabilizing members 72 and 73 are provided with widening portions 84 and 86 at their tip portions, respectively, and in the widening portions 84 and 86, the end faces 84c and 86c correspond to the opening of the fuel nozzle 61.
  • 61 b and the same position in the flow direction of the fuel gas 301 are arranged on the same plane.
  • the first flame stabilizing member 71 is provided with a first widening portion 82 at its front end portion, and the first widening portion 82 has an end face 82c in the ejection direction of the fuel gas 301 from the opening 61b of the fuel nozzle 61. It is located upstream. That is, in the second and third flame stabilizing members 72 and 73, the end faces 84c and 86c of the widened portions 84 and 86 and the opening 61b of the fuel nozzle 61 are at the same position in the ejection direction of the fuel gas 301.
  • the end face 82c of the first widening part 82 is predetermined on the upstream side of the fuel gas 301 in the ejection direction with respect to the opening 61b of the fuel nozzle 61 (the end faces 84c and 86c of the widening parts 84 and 86). It is disposed at a position separated by a distance L.
  • the first, second, and third flame stabilizing members 71, 72, 73 are supported by welding or the like on the inner wall surface 61a of the fuel nozzle 61 via the supporting members 87, 88 at the upper end and lower end of the rear portion There is.
  • the support members 87 and 88 are fixed to the upper and lower portions of the inner wall surface 61a of the fuel nozzle 61, and the upper and lower end portions of the first, second and third flame stabilizing members 71, 72 and 73 support this support. It is supported by members 87 and 88.
  • the first, second, and third flame stabilizing members 71, 72, 73 are fixed to the support members 87, 88 fixed to the inner wall surface 61 a of the fuel nozzle 61.
  • the present invention is not limited to this configuration.
  • the first flame stabilizing member 71 is disposed at a position where the end surface 82 c of the first wide portion 82 is retracted by a predetermined distance L from the opening 61 b of the fuel nozzle 61. It is conceivable to change the predetermined distance L of the position of the first widening portion 82 in accordance with the type of fuel, the amount of ejection, and the like. Therefore, it is desirable to provide the first flame stabilizing member 71 so as to be adjustable in position along the ejection direction of the fuel gas 301.
  • the first, second, and third flame stabilizing members 71, 72, 73 are supported by the supporting members 87, 88 as the flame holder 64, so that the area where the fuel gas flow path P1 has six is provided. It will be divided into That is, the fuel gas flow path P 1 includes the first fuel gas flow path P 11 between the third flame holding member 73 and each of the first flame holding members 71, the first flame holding member 71 and the second flame holding member 72. And the third fuel gas flow path P13 between the second flame holding member 72 and the inner wall surface 61a of the fuel nozzle 61.
  • the support members 87 and 88 support the flame stabilizing members 71, 72, 73, they do not affect the flow of the fuel gas 301, and the flame retaining members 71, 72, 73
  • the width (thickness) is set to be as small as possible (thin thickness).
  • the circumferential support position where the flame stabilizing members 71, 72, 73 are supported by the supporting members 87, 88 is not limited to the embodiment.
  • the second flame stabilizing member 72 and the third flame stabilizing member 73 are disposed between the second flame stabilizing member 72 and the third flame stabilizing member 73 although the flat portions 83 and 85 are present.
  • the first flame stabilizing member 71 does not have a flat portion and is constituted only by the first widening portion 82. Therefore, the first flame stabilizing member 71 is miniaturized, and a working space is secured behind each of the flame stabilizing members 71, 72, 73. The operator can access the flame stabilizing members 71, 72, 73 from the base end side of the fuel nozzle 61, and can easily carry out maintenance work such as cleaning, repair, and replacement of the flame holder 64. it can.
  • FIG. 3 is a horizontal sectional view showing the configuration of a combustion burner according to another embodiment.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the combustion burner 21A according to the embodiment shown in FIG. 3 is provided with a fuel nozzle 61, a combustion air nozzle 62, and a secondary air nozzle 63 from the center side, and a flame holder 64A is provided in the fuel nozzle 61. It is done.
  • the flame holder 64A is configured of two first flame holding members 71, two second flame holding members 72, and one third flame holding member 73.
  • the first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 are disposed along the flow direction of the fuel gas 301 and along the vertical direction, and at predetermined intervals in the horizontal direction. It is arranged.
  • the first flame stabilizing member 71 has a first widening portion 82 whose width is expanded toward the downstream side in the flow direction of the fuel gas 301 in a cross-sectional shape broken along the horizontal direction, and the first widening portion 82 Is in the shape of a triangular prism. That is, the first wide portion 82 includes the first guide surface 82a, the second guide surface 82b, and the end surface 82c.
  • the second flame stabilizing member 72 is integrally provided at the front end portion of the second flat portion 83 having a constant width and a front end portion of the second flat portion 83 in a sectional shape broken along the horizontal direction, and the width is a fuel gas
  • a second widening portion 84 is formed to expand toward the downstream side in the flow direction of the line 301.
  • the second flat portion 83 has a constant width along the flow direction of the fuel gas 301.
  • the second widening portion 84 has a first guide surface 84 a and an end surface 84 c.
  • the third flame stabilizing member 73 has a third widening portion 86 whose width extends toward the downstream side of the flow direction of the fuel gas 301 along the horizontal direction, and the third widening portion 86 has a triangular prism shape.
  • the third widening portion 86 has a horizontal cross section in the form of a substantially isosceles triangle, and is inclined to the first guide surface 86 a that is inclined toward the one first flame stabilizing member 71 and to the other first flame stabilizing member 71. And an end surface 86c on the front end side.
  • a plurality of first flame stabilizing members 71 are provided at predetermined intervals in the horizontal direction, and the second flame stabilizing members 72 are provided with fuel from the first flame stabilizing members 71.
  • the third flame stabilizing member 73 is disposed between the plurality of first flame stabilizing members 71 and provided at predetermined intervals on both sides of the inner wall surface 61 a of the nozzle 61, and the third flame stabilizing member 73 includes fuel gas 301. Only the third widening portion 86 which widens toward the downstream side in the flow direction.
  • first flame stabilizing members 71, second flame stabilizing members 72 and third flame stabilizing members 73 are alternately provided at predetermined intervals, and flat portions of the third flame stabilizing members 73 disposed at the center are eliminated.
  • FIG. 4 is a horizontal sectional view showing a combustion burner according to another embodiment.
  • the members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
  • the combustion burner 21B is provided with a fuel nozzle 61, a combustion air nozzle 62, and a secondary air nozzle 63 from the center side, and a flame holder 64B is provided in the fuel nozzle 61. There is.
  • the flame holder 64B is configured of two first flame holding members 71, two second flame holding members 72, and one third flame holding member 73.
  • the first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 are disposed along the flow direction of the fuel gas 301 and along the vertical direction, and at predetermined intervals in the horizontal direction. It is arranged.
  • the first flame stabilizing member 71 is a tip end portion of the fuel nozzle 61, and has a predetermined distance from the inner wall surface 61a of the fuel nozzle 61 on both sides in the radial direction with respect to the center line O along the ejection direction of the fuel gas 301. It is arranged with an empty space.
  • the second flame stabilizing member 72 is a tip end portion of the fuel nozzle 61 and is disposed at a predetermined interval on both sides of each first flame stabilizing member 71 in the horizontal direction. It is arrange
  • the third flame stabilizing member 73 is a tip end portion of the fuel nozzle 61, and is disposed on the center line O along the ejection direction of the fuel gas 301 and at a predetermined interval from the respective first flame stabilizing members 71. There is.
  • the first flame stabilizing member 71 has a first flat portion 81 having a constant width and a first flat portion 81 integrally provided at a front end portion of the first flat portion 81 in a sectional shape broken along the horizontal direction.
  • a wide portion 82 is formed.
  • the first flat portion 81 has a constant width along the flow direction of the fuel gas 301.
  • the width of the first widening portion 82 increases in the flow direction of the fuel gas 301.
  • the first widening portion 82 has a horizontal cross section in a substantially isosceles triangle shape, the base end portion is connected to the first flat portion 81, and the tip end portion is wide toward the downstream side in the flow direction of the fuel gas 301
  • the front end is a plane perpendicular to the flow direction of the fuel gas 301. That is, the first wide portion 82 has a first guide surface 82a inclined inward in the width direction, a second guide surface 82b inclined outward in the width direction, and an end surface 82c on the front end side.
  • the second flame stabilizing member 72 has a second widening portion 84 whose width is expanded toward the downstream side in the flow direction of the fuel gas 301 in a cross-sectional shape broken along the horizontal direction, and the second widening portion 84 Is in the shape of a triangular prism. That is, the second widening portion 84 has a first guide surface 84a whose horizontal cross section has a substantially isosceles triangle shape and is inclined inward in the width direction, and an end surface 84c orthogonal to the flow direction of the fuel gas 301 on the front end side. There is no guide surface on the outer side in the width direction, and it is a plane along the flow direction of the fuel gas 301.
  • the third flame stabilizing member 73 has a third widening portion 86 whose width extends toward the downstream side of the flow direction of the fuel gas 301 in a cross-sectional shape broken along the horizontal direction, and the third widening portion 86 Is in the shape of a triangular prism. That is, the third widening portion 86 has a horizontal cross section in the form of a substantially isosceles triangle, and is inclined to the first guide surface 86 a that is inclined toward the one first flame stabilizing member 71 and to the other first flame stabilizing member 71. And an end surface 86c on the front end side.
  • the first flame stabilizing member 71 has the first flat portion 81 and the first widening portion 82, and the second flame stabilizing member 72 is the second widening portion. It has only 84.
  • the working space can be secured in the fuel nozzle. . Therefore, the maintenance worker can access the flame holder 64B from the base end side of the fuel nozzle 61 through the working space, facilitating maintenance work such as cleaning, repair and replacement of the flame holder 64B. It can be implemented.
  • the flat portion of the first flame stabilizing member 71 is eliminated and only the first widening portion 82 is used.
  • the first flame stabilizing member 71 and the third flame stabilizing member are used.
  • the flat portion of 73 is eliminated and only the second and third widening portions 84 and 86 are provided
  • the flat portions of the second flame stabilizing member 72 and the third flame stabilizing member 73 are eliminated and the widening portion
  • the present invention is not limited to these configurations.
  • the first flame stabilizing member 71 and the second flame stabilizing member 72 may be formed of a flat portion and a widening portion
  • the flat portion of the third flame stabilizing member 73 may be eliminated to form only the widening portion.
  • the flat portion of any of the first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 is eliminated and only the widening portion is provided.
  • all flat portions of the second flame stabilizing member 72 and the third flame stabilizing member 73 may be eliminated and only the widening portion may be provided. That is, the first flame stabilizing member 71 has only the first widening portion 82 which widens toward the downstream side of the flow direction of the fuel gas 301, and the second flame stabilizing member 72 is downstream of the flow direction of the fuel gas 301
  • the third flame stabilizing member 73 has only the third widening portion 86 widening toward the downstream side in the flow direction of the fuel gas 301. Therefore, the worker can access the flame holder 64 from the base end side of the fuel nozzle 61 through the large working space, and facilitates maintenance work such as cleaning, repair, and replacement of the flame holder 64. It can be implemented.
  • first flame holding members 71, two second flame holding members 72, and one third flame holding member 73 are provided as the flame holder 64, 64A, 64B.
  • the flame holder may be composed of two first flame holding members and two second flame holding members, or the flame holder may be composed of two first flame holding members and one third flame holding member. It may be configured.
  • the number of first flame stabilizing members is not limited to one or two, and three or more may be provided.
  • the fuel nozzle 61, the combustion air nozzle 62, and the secondary air nozzle 63 are rectangular, but the present invention is not limited to this shape, and may be circular.
  • the first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 are disposed along the flow direction of the fuel gas 301 and along the vertical direction.
  • the flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 may be disposed along the flow direction of the fuel gas 301 and along the horizontal direction.
  • the boiler of the present invention is a coal-fired boiler, but as the solid fuel, a boiler using biomass, petroleum coke, petroleum residue or the like may be used. Moreover, it can be used not only for solid fuel as fuel but for oil-fired boilers, such as heavy oil. Furthermore, it can be applied to mixed burning of these fuels.

Abstract

A combustion burner, combustion device, and boiler, provided with: a fuel nozzle (61) for ejecting a fuel gas (301); a combustion air nozzle (62) for ejecting a fuel gas combustion gas (302) from outside of the fuel nozzle (61); and a flame stabilizer (64) for widening the ejection direction of the fuel gas (301). The flame stabilizer (64) has first flame stabilization members (71) arranged on the upstream side of an opening part (61b) of the fuel nozzle (61) in the fuel gas (301) ejection direction, and second flame stabilization members (72) arranged on the downstream side of the first flame stabilization members (71) in the fuel gas (301) ejection direction, and adjacent to the first flame stabilization members (71). The first flame stabilization members (71) have only a first widened section (82) the width of which increases toward the downstream side in the direction of flow of the fuel gas (301).

Description

燃焼バーナ及び燃焼装置並びにボイラCombustion burner, combustion apparatus and boiler
　燃料と空気を混合して燃焼させる燃焼バーナ、この燃焼バーナにより火炎流を形成する燃焼装置、この燃焼装置により発生した燃焼ガスにより蒸気を生成するボイラに関するものである。 The present invention relates to a combustion burner which mixes and burns fuel and air, a combustion device which forms a flame flow by the combustion burner, and a boiler which generates steam by combustion gas generated by the combustion device.
　従来のボイラは、中空形状をなして鉛直方向に設置される火炉を有し、この火炉壁に複数の燃焼バーナが周方向及び上下方向に配置されている。そして、この火炉は、上部に煙道が連結され、この煙道に排ガスの熱を回収して蒸気を生成するための熱交換器が配置されている。燃焼バーナは、石炭などの燃料が粉砕された微粉燃料と１次空気との混合気が供給されると共に、高温の２次空気が供給され、この混合気と２次空気を火炉内に吹き込むことで火炎を形成する。 The conventional boiler has a hollow shape and has a vertically installed furnace, and a plurality of combustion burners are arranged circumferentially and vertically on the furnace wall. And a flue is connected with the upper part of this furnace, and the heat exchanger for collecting the heat of exhaust gas and producing steam is arranged in this flue. The combustion burner is supplied with a mixture of pulverized fuel and pulverized primary fuel such as coal, and is supplied with high temperature secondary air, and this mixture and the secondary air are blown into the furnace. Form a flame.
　このようなボイラに適用された燃焼バーナとしては、例えば、下記特許文献１に記載されたものがある。特許文献１に記載された燃焼バーナは、微粉炭バーナと、コール１次ポートと、コール２次ポートと、スプリット部材を設け、スプリット部材に微粉炭濃縮流を衝突させ、広い負荷範囲において安定して低ＮＯｘ燃焼を可能とするものである。 As a combustion burner applied to such a boiler, there is, for example, one described in Patent Document 1 below. The combustion burner described in Patent Document 1 is provided with a pulverized coal burner, a coal primary port, a coal secondary port, and a split member, and the split member collides with the pulverized coal concentrated stream to be stable in a wide load range. Enables low NOx combustion.
特開２０１１－１２７８３６号公報JP, 2011-127836, A
　しかし、上述した特許文献１に記載の燃焼バーナでは、保炎器の摩耗に対するメンテナンス作業において、燃料ノズルの先端部に複数の保炎器が所定間隔で配置されており作業空間が十分に確保されておらず、メンテナンスの作業性が低下する。 However, in the combustion burner described in Patent Document 1 described above, in maintenance work for the wear of the flame holder, a plurality of flame holders are arranged at predetermined intervals at the tip of the fuel nozzle, and a sufficient work space is secured. And maintenance work efficiency is reduced.
　上述の事情を鑑みて、本発明の幾つかの実施形態は、燃料ノズルのメンテナンス作業の作業性の向上を図ることを目的とする。 In view of the above-described circumstances, some embodiments of the present invention aim to improve the workability of maintenance work for a fuel nozzle.
　本発明の少なくとも一実施形態に係る燃焼バーナは、燃料と空気とを混合した燃料ガスを噴出する燃料ノズルと、前記燃料ノズルの外側から空気を噴出する燃焼用空気ノズルと、前記燃料ノズルの噴出開口部より燃料ガスの噴出方向上流側に配置されて前記燃料ガスの噴出方向を拡幅する第１保炎部材と、前記第１保炎部材より前記燃料ガスの噴出方向下流側で且つ前記第１保炎部材に隣接して配置されて前記燃料ガスの噴出方向を拡幅する第２保炎部材と、を備え、前記第１保炎部材と前記第２保炎部材の少なくとも一方は、燃料ガスの流れ方向の下流側に向けて拡幅する拡幅部のみを有する、ことを特徴とするものである。 A combustion burner according to at least one embodiment of the present invention comprises a fuel nozzle for spouting a fuel gas in which fuel and air are mixed, a combustion air nozzle for spouting air from the outside of the fuel nozzle, and a spout of the fuel nozzle A first flame stabilizing member disposed on the upstream side of the fuel gas ejection direction from the opening to widen the fuel gas ejection direction, and the fuel gas ejection direction downstream of the first flame holding member and the first flame stabilizing member And a second flame holding member disposed adjacent to the flame holding member to widen the jet direction of the fuel gas, wherein at least one of the first flame holding member and the second flame holding member is of fuel gas. It is characterized by having only a widening portion which widens toward the downstream side in the flow direction.
　上記構成によれば、少なくとも第１保炎部材や第２保炎部材の一方は小型化が可能となり、燃料ノズル内に作業空間部が確保される。このため、保炎部材の清掃、補修、交換などのメンテナンス作業をこの作業空間部を利用して実施することができ、燃料ノズルのメンテナンス作業の作業性の向上を図ることができる。 According to the above configuration, at least one of the first flame stabilizing member and the second flame stabilizing member can be miniaturized, and a working space is secured in the fuel nozzle. Therefore, maintenance work such as cleaning, repair, and replacement of the flame stabilizing member can be performed using this work space portion, and the workability of the maintenance work of the fuel nozzle can be improved.
　幾つかの実施形態では、上記した燃焼バーナの構成において、前記第１保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第１拡幅部のみを有し、前記第２保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第２拡幅部と、前記第２拡幅部より燃料ガスの流れ方向の上流側に連結される第２平坦部とを有することを特徴としている。 In some embodiments, in the above-described configuration of the combustion burner, the first flame stabilizing member includes only a first widening portion that widens toward the downstream side of the flow direction of the fuel gas, and the second flame stabilizing member The member is characterized by having a second widening portion which widens toward the downstream side in the flow direction of the fuel gas, and a second flat portion connected to the upstream side in the flow direction of the fuel gas from the second widening portion. And
　上記構成によれば、第１保炎部材を第１拡幅部のみで形成することで燃料ノズル内部に作業空間部を確保することができる。このため、燃料ノズルの基端部側から作業空間部を介して保炎部材にアクセスすることができ、保炎部材の清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 According to the above configuration, the working space portion can be secured inside the fuel nozzle by forming the first flame stabilizing member with only the first widening portion. Therefore, the flame stabilizing member can be accessed from the base end side of the fuel nozzle through the working space, and maintenance work such as cleaning, repair, and replacement of the flame stabilizing member can be easily performed.
　幾つかの実施形態では、上記した燃焼バーナの構成において、前記第１保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第１拡幅部と、前記第１拡幅部より燃料ガスの流れ方向の上流側に連結される第１平坦部とを有し、前記第２保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第２拡幅部のみを有することを特徴とする。 In some embodiments, in the above-described configuration of the combustion burner, the first flame stabilizing member is a first widening portion that widens toward the downstream side of the flow direction of the fuel gas, and a fuel gas from the first widening portion And a first flat portion connected to the upstream side in the flow direction, and the second flame stabilizing member has only a second widening portion that widens toward the downstream side in the flow direction of the fuel gas. I assume.
　上記構成によれば、第２保炎部材を第２拡幅部のみで形成することで、燃料ノズルの基端部側から作業空間部を介して第１及び第２保炎部材にアクセスすることができる。このため、保炎部材の清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 According to the above configuration, by forming the second flame stabilizing member with only the second widening portion, the first and second flame stabilizing members can be accessed from the base end side of the fuel nozzle through the working space portion. it can. Therefore, maintenance work such as cleaning, repair and replacement of the flame stabilizing member can be easily performed.
　幾つかの実施形態では、上記した燃焼バーナの構成において、前記第１保炎部材は、水平方向または鉛直方向に所定間隔を空けて複数設けられ、前記第２保炎部材は、前記第１保炎部材より前記燃料ノズルの内壁面側の両側に所定間隔を空けて設けられ、複数の前記第１保炎部材の間に第３保炎部材が配置され、前記第３保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第３拡幅部のみを有することを特徴としている。 In some embodiments, in the above-described configuration of the combustion burner, a plurality of the first flame stabilizing members are provided at predetermined intervals in the horizontal direction or the vertical direction, and the second flame stabilizing members are the first flame retaining members. A predetermined spacing is provided on both sides of the flame member on the inner wall side of the fuel nozzle, and a third flame holding member is disposed between the plurality of first flame holding members, and the third flame holding member is a fuel It is characterized in that only the third widening portion which widens toward the downstream side in the gas flow direction is provided.
　上記構成によれば、第１保炎部材と第２保炎部材と第３保炎部材を交互に所定間隔を空けて複数設け、中央に配置された第３保炎部材を第３拡幅部のみで形成することで、燃料ノズルの基端部側から作業空間部を介して中央部から第１及び第２保炎部材にアクセスすることができる。このため、保炎部材の清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 According to the above configuration, a plurality of first flame holding members, a second flame holding member, and a third flame holding member are alternately provided at predetermined intervals, and the third flame holding member disposed at the center is only the third widening portion With the above configuration, the first and second flame stabilizing members can be accessed from the central portion through the working space portion from the proximal end side of the fuel nozzle. Therefore, maintenance work such as cleaning, repair and replacement of the flame stabilizing member can be easily performed.
　幾つかの実施形態では、上記した燃焼バーナの構成において、前記第１保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第１拡幅部のみを有し、前記第２保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第２拡幅部のみを有することを特徴としている。 In some embodiments, in the above-described configuration of the combustion burner, the first flame stabilizing member includes only a first widening portion that widens toward the downstream side of the flow direction of the fuel gas, and the second flame stabilizing member The member is characterized by having only the second widening portion which widens toward the downstream side in the flow direction of the fuel gas.
　上記構成によれば、第１保炎部材と第２保炎部材を拡幅部のみで形成することで、燃料ノズルの基端部側から作業空間部を介して第１及び第２保炎部材にアクセスすることができる。このため、保炎部材の清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 According to the above configuration, by forming the first flame stabilizing member and the second flame stabilizing member with only the widened portion, the first and second flame stabilizing members can be formed from the base end side of the fuel nozzle through the working space portion. It can be accessed. Therefore, maintenance work such as cleaning, repair and replacement of the flame stabilizing member can be easily performed.
　幾つかの実施形態では、上記した燃焼バーナの構成において、前記第２保炎部材は、前記第１保炎部材の拡幅方向の両側に配置され、前記第１保炎部材は、燃料ガスの噴出方向を２方向に拡幅する前記第１拡幅部が設けられ、前記燃料ノズルの内壁面側に配置される前記第２保炎部材は、前記燃料ノズルにおける軸線中心側のみに燃料ガスの噴出方向を拡幅する前記第２拡幅部が設けられることを特徴としている。 In some embodiments, in the above-described configuration of the combustion burner, the second flame stabilizing member is disposed on both sides in the widthwise direction of the first flame stabilizing member, and the first flame stabilizing member is configured to eject a fuel gas. The first widening portion which widens the direction in two directions is provided, and the second flame stabilizing member disposed on the inner wall surface side of the fuel nozzle has a jet direction of fuel gas only on the axial center side of the fuel nozzle. It is characterized in that the second widening portion which widens is provided.
　上記構成によれば、燃料ガスは、第１保炎部材により少なくとも２方向に広がって再循環領域を形成し、第２保炎部材により第１保炎部材側のみに広がって再循環領域を形成することとなり、燃料ノズルにおける外部保炎を抑制し、ＮＯｘ発生量を減少することができる。 According to the above configuration, the fuel gas spreads in at least two directions by the first flame stabilizing member to form the recirculation region, and spreads only to the first flame stabilizing member side by the second flame stabilizing member to form the recirculation region As a result, the external flame holding in the fuel nozzle can be suppressed, and the amount of NOx generation can be reduced.
　また、本発明の少なくとも一実施形態に係る燃焼装置は、前記燃焼バーナが周方向に所定間隔を空けて複数配置されて火炎旋回流を形成する、ことを特徴とするものである。 In the combustion apparatus according to at least one embodiment of the present invention, a plurality of the combustion burners are disposed circumferentially at predetermined intervals to form a flame swirl flow.
　上記構成によれば、各燃焼バーナにて、燃料ノズルの基端部側から作業空間部を介して保炎部材にアクセスすることができ、保炎部材の清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 According to the above configuration, in each combustion burner, the flame stabilizing member can be accessed from the base end side of the fuel nozzle through the working space, and maintenance work such as cleaning, repair, replacement of the flame stabilizing member can be performed. It can be easily implemented.
　また、本発明の少なくとも一実施形態に係るボイラは、中空形状をなして鉛直方向に沿って設置される火炉と、前記燃焼装置と、を備えることを特徴とするものである。 In addition, a boiler according to at least one embodiment of the present invention is characterized by including a furnace having a hollow shape and installed along a vertical direction, and the combustion device.
　上記構成によれば、火炉の各燃焼バーナにて、燃料ノズルの基端部側から作業空間部を介して保炎部材にアクセスすることができ、保炎部材の清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 According to the above configuration, at each combustion burner of the furnace, the flame holding member can be accessed from the base end side of the fuel nozzle through the working space, and maintenance such as cleaning, repair, replacement of the flame holding member Work can be easily carried out.
　本発明の少なくとも一実施形態によれば、燃料ノズルのメンテナンス作業の作業性を向上することができる。 According to at least one embodiment of the present invention, the workability of the maintenance operation of the fuel nozzle can be improved.
幾つかの実施形態に係る燃焼バーナの一実施形態の構成を示す正面図である。It is a front view showing the composition of one embodiment of the combustion burner concerning some embodiments. 幾つかの実施形態に係る燃焼バーナをの一実施形態の構成を示す水平断面（図１のII－II断面）図である。It is a horizontal cross section (II-II cross section of Drawing 1) showing composition of one embodiment of a combustion burner concerning some embodiments. 他の実施形態に係る燃焼バーナの構造を示す水平断面図である。It is a horizontal sectional view which shows the structure of the combustion burner which concerns on other embodiment. 他の実施形態に係る燃焼バーナの構造を示す水平断面図である。It is a horizontal sectional view which shows the structure of the combustion burner which concerns on other embodiment.
　以下に添付図面を参照して、本発明の幾つかの実施形態について説明する。ただし、実施形態として記載されている又は図面に示される構成部品等は、本発明の範囲をこれに限定する趣旨ではなく、単なる説明例にすぎない。また、実施形態を組み合わせて構成されるものも含むものである。 Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the component parts etc. which are described as embodiment, or shown by drawing are not the meaning which limits the scope of the present invention to this, but are only an illustration example. Moreover, what is comprised combining an embodiment is also included.
　図１は、幾つかの実施形態に係る燃焼バーナの一実施形態の構成を示す正面図である。図２は、幾つかの実施形態に係る燃焼バーナの一実施形態の構成を示す水平断面（図１のII－II断面）図である。 FIG. 1 is a front view showing the configuration of an embodiment of a combustion burner according to some embodiments. FIG. 2 is a horizontal sectional view (II-II sectional view of FIG. 1) showing the configuration of one embodiment of the combustion burner according to some embodiments.
　図１及び図２に示した一実施形態では、燃焼バーナ２１は、中心側から燃料ノズル６１と、燃焼用空気ノズル６２と、２次空気ノズル６３が設けられると共に、燃料ノズル６１内に保炎器６４が設けられている。 In the embodiment shown in FIGS. 1 and 2, the combustion burner 21 is provided with a fuel nozzle 61, a combustion air nozzle 62, and a secondary air nozzle 63 from the center side, and the flame holding in the fuel nozzle 61. A vessel 64 is provided.
　燃料ノズル６１は、微粉炭（固体燃料）と搬送用空気（１次空気）とを混合した微粉燃料混合気（以下、燃料ガス）３０１を噴出可能なものである。燃焼用空気ノズル６２は、燃料ノズル６１の外側に配置され、燃料ノズル６１から噴出された燃料ガス３０１の外周側に燃焼用空気の一部（燃料ガス燃焼用空気）３０２を噴出可能なものである。２次空気ノズル６３は、燃焼用空気ノズル６２の外側に配置され、燃焼用空気ノズル６２から噴出された燃料ガス燃焼用空気３０２の外周側に燃焼用空気の一部（以下、２次空気）３０３を噴出可能なものである。 The fuel nozzle 61 is capable of spouting a pulverized fuel mixture (hereinafter referred to as fuel gas) 301 in which pulverized coal (solid fuel) and transport air (primary air) are mixed. The combustion air nozzle 62 is disposed outside the fuel nozzle 61, and can eject part of the combustion air (air for fuel gas combustion) 302 to the outer peripheral side of the fuel gas 301 ejected from the fuel nozzle 61. is there. The secondary air nozzle 63 is disposed outside the combustion air nozzle 62, and a part of the combustion air (hereinafter, secondary air) on the outer peripheral side of the fuel gas combustion air 302 jetted from the combustion air nozzle 62 It is possible to spout 303.
　保炎器６４は、燃料ノズル６１内であって、燃料ノズル６１の先端部、つまり、燃料ガス３０１の流動方向の下流側に配置されることで、燃料ガス３０１の着火用及び保炎用の部材として機能するものである。この保炎器６４は、２個の第１保炎部材７１と、２個の第２保炎部材７２と、１個の第３保炎部材７３とから構成されている。この第１保炎部材７１と第２保炎部材７２と第３保炎部材７３は、燃料ガス３０１の流動方向に沿うと共に鉛直方向に沿って配置されると共に、水平方向に所定間隔を空けて配置されている。 The flame holder 64 is disposed inside the fuel nozzle 61 and at the tip of the fuel nozzle 61, that is, on the downstream side in the flow direction of the fuel gas 301, and thus for ignition and flame holding of the fuel gas 301. It functions as a member. The flame stabilizer 64 is composed of two first flame stabilizing members 71, two second flame stabilizing members 72, and one third flame stabilizing member 73. The first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 are disposed along the flow direction of the fuel gas 301 and along the vertical direction, and at predetermined intervals in the horizontal direction. It is arranged.
　第１保炎部材７１は、燃料ノズル６１の先端部であって、燃料ガス３０１の噴出方向に沿う中心線（燃料ノズル６１の中心線）Ｏに対して径方向の両側（燃料ノズル６１の内壁面６１ａ側）で、且つ、燃料ノズル６１の内壁面６１ａから所定間隔（隙間）を空けて配置されており、鉛直方向に沿うと共に燃料ガス３０１の噴出方向に沿う板形状をなしている。第２保炎部材７２は、燃料ノズル６１の先端部であって、各第１保炎部材７１に対して水平方向の外側の両側（燃料ノズル６１の内壁面６１ａ側）に所定間隔（隙間）を空けて配置されると共に、燃料ノズル６１の内壁面６１ａから所定間隔（隙間）を空けて配置されており、鉛直方向に沿うと共に燃料ガス３０１の噴出方向に沿う板形状をなしている。第３保炎部材７３は、燃料ノズル６１の先端部であって、燃料ガス３０１の噴出方向に沿う中心線（燃料ノズル６１の中心線）Ｏ上で、且つ、各第１保炎部材７１から所定間隔（隙間）を空けて配置されており、鉛直方向に沿うと共に燃料ガス３０１の噴出方向に沿う板形状をなしている。 The first flame stabilizing member 71 is a tip end portion of the fuel nozzle 61, and both sides in the radial direction (in the fuel nozzle 61) with respect to a center line O along the ejection direction of the fuel gas 301 (center line of the fuel nozzle 61). It is disposed on the wall surface 61a side and spaced from the inner wall surface 61a of the fuel nozzle 61 by a predetermined distance (a gap), and has a plate shape along the vertical direction and along the ejection direction of the fuel gas 301. The second flame stabilizing member 72 is a tip end portion of the fuel nozzle 61, and has a predetermined interval (a gap) on both sides (the inner wall surface 61a side of the fuel nozzle 61) in the horizontal direction with respect to each first flame stabilizing member 71. And a predetermined interval (space) from the inner wall surface 61a of the fuel nozzle 61, and has a plate shape along the vertical direction and along the ejection direction of the fuel gas 301. The third flame stabilizing member 73 is a tip end portion of the fuel nozzle 61, and on the center line O (center line of the fuel nozzle 61) along the ejection direction of the fuel gas 301, and from each first flame stabilizing member 71 It is disposed at a predetermined interval (gap), and has a plate shape along the vertical direction and along the ejection direction of the fuel gas 301.
　燃料ノズル６１及び燃焼用空気ノズル６２は、長尺な管状構造をなす。燃料ノズル６１は、４個の平坦な内壁面６１ａにより、長手方向に延びて同一の流路断面形状となる燃料ガス流路Ｐ１を形成しており、先端部（下流側端部）に矩形状の開口部６１ｂが設けられている。燃焼用空気ノズル６２は、燃料ノズル６１の４個の平坦な外壁面６１ｃと、４個の平坦な内壁面６２ａにより、長手方向に延びて同一の流路断面形状となる燃焼用空気流路Ｐ２を形成しており、先端部（下流側端部）に矩形リング形状の開口部６２ｂが設けられている。そのため、燃料ノズル６１と燃焼用空気ノズル６２は、二重管状構造となっている。 The fuel nozzle 61 and the combustion air nozzle 62 have an elongated tubular structure. The fuel nozzle 61 forms a fuel gas flow path P1 extending in the longitudinal direction and having the same flow path cross-sectional shape by four flat inner wall surfaces 61a, and has a rectangular shape at the tip end (downstream end). The opening 61 b of the The combustion air nozzle 62 extends in the longitudinal direction by the four flat outer wall surfaces 61 c of the fuel nozzle 61 and the four flat inner wall surfaces 62 a so as to have the same flow channel cross-sectional shape P 2 And a rectangular ring-shaped opening 62b is provided at the tip (downstream end). Therefore, the fuel nozzle 61 and the combustion air nozzle 62 have a double tubular structure.
　２次空気ノズル６３は、燃料ノズル６１及び燃焼用空気ノズル６２の外側に配置される長尺な管状構造をなす。２次空気ノズル６３は、４本の矩形断面形状をなす管状構造をなし、燃焼用空気ノズル６２の上方、下方、左方、右方に単独で配置された２次空気ノズル本体６３ａ，６３ｂ，６３ｃ，６３ｄからなり、燃焼用空気ノズル６２の外側に所定隙間を空けて配置されている。２次空気ノズル６３は、４本の２次空気ノズル本体６３ａ，６３ｂ，６３ｃ，６３ｄにより、長手方向に延びて同一の流路断面形状となる４個の２次空気流路Ｐ３１，Ｐ３２，Ｐ３３，Ｐ３４を形成しており、先端部（下流側端部）に矩形リング形状の開口部６３ｅが設けられている。 The secondary air nozzle 63 has an elongated tubular structure disposed outside the fuel nozzle 61 and the combustion air nozzle 62. The secondary air nozzle 63 has a tubular structure having four rectangular cross-sectional shapes, and is a secondary air nozzle main body 63a, 63b, disposed independently above, below, to the left, to the right of the combustion air nozzle 62. 63c and 63d and is disposed outside the combustion air nozzle 62 with a predetermined gap. The secondary air nozzles 63 extend in the longitudinal direction by the four secondary air nozzle bodies 63a, 63b, 63c, 63d, and have four secondary air flow paths P31, P32, P33 having the same flow passage cross sectional shape. , P34, and a rectangular ring-shaped opening 63e is provided at the tip (downstream end).
　なお、燃料ノズル６１、燃焼用空気ノズル６２の形状は真四角に限らず、矩形でもよく、この場合、角部に曲率をつけた形状としてもよい。角部に曲率をつけた管状構造とすることで、ノズルの強度を向上することができる。更に、円筒としてもよい。 The shapes of the fuel nozzle 61 and the combustion air nozzle 62 are not limited to square, and may be rectangular. In this case, the corner may be curved. The strength of the nozzle can be improved by forming a tubular structure in which the corners are curved. Furthermore, it may be a cylinder.
　そのため、燃料ノズル６１（燃料ガス流路Ｐ１）の開口部６１ｂの外側に燃焼用空気ノズル６２（燃焼用空気流路Ｐ２）の開口部６２ｂが配設され、この燃焼用空気ノズル６２（燃焼用空気流路Ｐ２）の開口部６２ｂの外側に所定間隔を空けて２次空気ノズル６３（２次空気流路Ｐ３）の開口部６３ｅが配設されることとなる。燃料ノズル６１と燃焼用空気ノズル６２と２次空気ノズル６３は、各開口部６１ｂ，６２ｂ，６３ｅが燃料ガス３０１や空気の流れ方向における同位置に同一面上に揃えられて配置されている。 Therefore, the opening 62b of the combustion air nozzle 62 (combustion air flow path P2) is disposed outside the opening 61b of the fuel nozzle 61 (fuel gas flow path P1), and this combustion air nozzle 62 (for combustion An opening 63e of the secondary air nozzle 63 (secondary air flow path P3) is disposed at a predetermined interval outside the opening 62b of the air flow path P2). The fuel nozzle 61, the combustion air nozzle 62, and the secondary air nozzle 63 are arranged such that the openings 61b, 62b, and 63e are aligned at the same position in the flow direction of the fuel gas 301 and the air.
　なお、２次空気ノズル６３は、４本の２次空気ノズル本体６３ａ，６３ｂ，６３ｃ，６３ｄにより構成せずに、燃焼用空気ノズル６２の外側に二重管状構造として矩形状に配置してもよい。また、２次空気ノズル６３は、２次空気ノズル本体６３ａ，６３ｂ，６３ｃ，６３ｄにより構成したが、上下の２次空気ノズル本体６３ａ，６３ｂだけとしたり、左右の２次空気ノズル本体６３ｃ，６３ｄだけとしたりしてもよい。更に、２次空気ノズル６３は、各２次空気ノズル本体６３ａ，６３ｂ，６３ｃ，６３ｄにダンパ開度調整機構などを設けることで、２次空気３０３の噴出量を調整可能としてもよい。 Incidentally, the secondary air nozzle 63 may be disposed in a rectangular shape as a double tubular structure outside the combustion air nozzle 62 without being configured by the four secondary air nozzle bodies 63a, 63b, 63c, 63d. Good. Further, although the secondary air nozzle 63 is configured by the secondary air nozzle main bodies 63a, 63b, 63c, 63d, only the upper and lower secondary air nozzle main bodies 63a, 63b are used, and the left and right secondary air nozzle main bodies 63c, 63d You may leave it alone. Furthermore, the secondary air nozzle 63 may adjust the ejection amount of the secondary air 303 by providing a damper opening degree adjustment mechanism or the like in each of the secondary air nozzle bodies 63a, 63b, 63c, 63d.
　ここで、保炎器６４について詳細に説明する。第１保炎部材７１は、水平方向に沿って破断した断面形状（図２）にて、幅が燃料ガス３０１の流れ方向の下流側に向けて拡大する第１拡幅部８２を有し、第１拡幅部８２は、三角柱形状をなしている。即ち、第１拡幅部８２は、水平断面が略二等辺三角形状をなし、幅方向の内側（燃料ノズル６１の中心線Ｏ側）に傾斜する第１ガイド面８２ａと、幅方向の外側（燃料ノズル６１の内壁面６１ａ側）に傾斜する第２ガイド面８２ｂと、前端側の燃料ガス３０１の流れ方向に直交する端面８２ｃとを有している。各ガイド面８２ａ，８２ｂと端面８２ｃによって形成される角部で燃料ガス３０１の流れが剥離する。この場合、第１拡幅部８２は、鉛直方向に沿って幅が一定となっているが、幅を異ならせてもよい。また、第１ガイド面８２ａと第２ガイド面８２ｂと端面８２ｃは、平面であることが望ましいが、凹状または凸状に屈曲または湾曲した面であってもよい。 Here, the flame holder 64 will be described in detail. The first flame stabilizing member 71 has a first widening portion 82 whose width is expanded toward the downstream side of the flow direction of the fuel gas 301 in a cross-sectional shape (FIG. 2) broken along the horizontal direction. The 1 widening portion 82 has a triangular prism shape. That is, the first wide part 82 has a horizontal cross section in the form of a substantially isosceles triangle, and is inclined inward in the width direction (the center line O side of the fuel nozzle 61) and the outside in the width direction (fuel It has a second guide surface 82b inclined to the inner wall surface 61a side of the nozzle 61, and an end surface 82c orthogonal to the flow direction of the fuel gas 301 on the front end side. The flow of the fuel gas 301 is separated at the corner formed by the guide surfaces 82a and 82b and the end surface 82c. In this case, the width of the first widening portion 82 is constant along the vertical direction, but the width may be different. The first guide surface 82a, the second guide surface 82b, and the end surface 82c are preferably flat surfaces, but may be surfaces bent or curved in a concave or convex shape.
　第２保炎部材７２は、水平方向に沿って破断した断面形状（図２）にて、幅が一定な第２平坦部８３と、この第２平坦部８３の前端部（燃料ガス３０１の流れ方向の下流端部）に一体に設けられた第２拡幅部８４とから構成されている。第２平坦部８３は、燃料ガス３０１の流れ方向に沿って幅が一定である。第２拡幅部８４は、燃料ガス３０１の流れ方向に向かって幅が大きくなる。この第２拡幅部８４は、水平断面が略二等辺三角形状をなし、基端部が第２平坦部８３に連結され、先端部が燃料ガス３０１の流れ方向の下流側に向って幅が広くなり、前端がこの燃料ガス３０１の流れ方向に直交する平面となっている。即ち、第２拡幅部８４は、幅方向の内側（燃料ノズル６１の中心線Ｏ側）に傾斜する第１ガイド面８４ａと、前端側の端面８４ｃとを有しており、幅方向の外側（燃料ノズル６１の内壁面６１ａ側）にはガイド面がなく、第２平坦部８３の端面が継続する平面となっている。ガイド面８４ａと端面８４ｃによって形成される角部で燃料ガス３０１の流れが剥離する。この場合、第２拡幅部８４は、その長手方向（鉛直方向）に沿って幅が一定となっているが、幅を異ならせてもよい。第２拡幅部８４をより小さくすることで相対的に内部着火を強くすることもできる。また、第１ガイド面８４ａと端面８４ｃは、平面であることが望ましいが、凹状または凸状に屈曲または湾曲した面であってもよい。 The second flame stabilizing member 72 has a second flat portion 83 having a constant width and a front end portion of the second flat portion 83 (a flow of the fuel gas 301) in a sectional shape (FIG. 2) broken along the horizontal direction. And a second widening portion 84 integrally provided at the downstream end in the direction. The second flat portion 83 has a constant width along the flow direction of the fuel gas 301. The second widening portion 84 increases in width in the flow direction of the fuel gas 301. The second widening portion 84 has a horizontal cross section in a substantially isosceles triangle shape, the base end portion is connected to the second flat portion 83, and the tip end portion is wide toward the downstream side in the flow direction of the fuel gas 301 The front end is a plane perpendicular to the flow direction of the fuel gas 301. That is, the second widening portion 84 has a first guide surface 84a inclined to the inside in the width direction (the center line O side of the fuel nozzle 61) and an end surface 84c on the front end side. There is no guide surface on the inner wall surface 61a side of the fuel nozzle 61, and the end surface of the second flat portion 83 is a flat surface. The flow of the fuel gas 301 is separated at the corner formed by the guide surface 84 a and the end surface 84 c. In this case, the width of the second widening portion 84 is constant along its longitudinal direction (vertical direction), but may be different. By making the second widening portion 84 smaller, the internal ignition can be relatively strengthened. The first guide surface 84 a and the end surface 84 c are preferably flat surfaces, but may be surfaces bent or curved in a concave or convex shape.
　第３保炎部材７３は、水平方向に沿って破断した断面形状（図２）にて、幅が一定な第３平坦部８５と、この第３平坦部８５の前端部（燃料ガス３０１の流れ方向の下流端部）に一体に設けられた第３拡幅部８６とから構成されている。第３平坦部８５は、燃料ガス３０１の流れ方向に沿って幅が一定である。第３拡幅部８６は、燃料ガス３０１の流れ方向に向かって幅が大きくなる。この第３拡幅部８６は、水平断面が略二等辺三角形状をなし、基端部が第３平坦部８５に連結され、先端部が燃料ガス３０１の流れ方向の下流側に向って幅が広くなり、前端がこの燃料ガス３０１の流れ方向に直交する平面となっている。即ち、第３拡幅部８６は、一方の第１保炎部材７１側に傾斜する第１ガイド面８６ａと、他方の第１保炎部材７１側に傾斜する第２ガイド面８６ｂと、前端側の端面８６ｃとを有している。各ガイド面８６ａ，８６ｂと端面８６ｃによって形成される角部で燃料ガス３０１の流れが剥離する。この場合、第３拡幅部８６は、その長手方向（鉛直方向）に沿って幅が一定となっているが、幅を異ならせてもよい。また、第１ガイド面８６ａと第２ガイド面８６ｂと端面８６ｃは、平面であることが望ましいが、凹状または凸状に屈曲または湾曲した面であってもよい。 The third flat holding member 73 has a third flat portion 85 having a constant width and a front end portion of the third flat portion 85 (a flow of the fuel gas 301) in a sectional shape (FIG. 2) broken along the horizontal direction. And a third widening portion 86 integrally provided at the downstream end in the direction. The third flat portion 85 has a constant width along the flow direction of the fuel gas 301. The third widening portion 86 increases in width in the flow direction of the fuel gas 301. The third widening portion 86 has a substantially isosceles triangular horizontal cross section, the base end portion is connected to the third flat portion 85, and the tip end portion is wide toward the downstream side in the flow direction of the fuel gas 301 The front end is a plane perpendicular to the flow direction of the fuel gas 301. That is, the third widening portion 86 includes a first guide surface 86a inclined to the one first flame stabilizing member 71 side, a second guide surface 86b inclined to the other first flame stabilizing member 71 side, and a front end side. And an end face 86c. The flow of the fuel gas 301 is separated at the corner formed by the guide surfaces 86a and 86b and the end surface 86c. In this case, the width of the third widening portion 86 is constant along the longitudinal direction (vertical direction), but the width may be different. The first guide surface 86a, the second guide surface 86b, and the end surface 86c are preferably flat surfaces, but may be surfaces bent or curved in a concave or convex shape.
　この場合、第１保炎部材７１と第２保炎部材７２と第３保炎部材７３と燃料ノズル６１の内壁面６１ａとは、前述したように、所定間隔の隙間を空けて配置されているが、この所定間隔とは、少なくとも保炎部材７１，７２，７３における拡幅部８２，８４，８６の幅以上の隙間、または、少なくとも保炎部材７１，７２，７３における拡幅部８２，８４，８６が熱延びにより互いにまたは燃料ノズル６１の内壁面６１ａに干渉（接触）しない程度の隙間である。 In this case, as described above, the first flame stabilizing member 71, the second flame stabilizing member 72, the third flame stabilizing member 73, and the inner wall surface 61a of the fuel nozzle 61 are arranged with a predetermined gap therebetween. However, this predetermined interval means a gap equal to or greater than the width of the widened portions 82, 84, 86 of the flame stabilizing members 71, 72, 73, or at least the widened portions 82, 84, 86 of the flame stabilizing members 71, 72, 73. Are gaps that do not interfere (contact) with each other or with the inner wall surface 61 a of the fuel nozzle 61 due to heat expansion.
　燃料ノズル６１は、内部にこの保炎器６４として第１、第２、第３保炎部材７１，７２，７３が幅方向（水平方向）に所定間隔を空けて配置されている。そして、第２、第３保炎部材７２，７３は、先端部に拡幅部８４，８６がそれぞれ設けられており、この拡幅部８４，８６は、各端面８４ｃ，８６ｃが燃料ノズル６１の開口部６１ｂと燃料ガス３０１の流れ方向における同位置に同一面上に揃えられて配置されている。一方、第１保炎部材７１は、先端部に第１拡幅部８２が設けられており、この第１拡幅部８２は、端面８２ｃが燃料ノズル６１の開口部６１ｂより燃料ガス３０１の噴出方向の上流側に配置されている。即ち、第２、第３保炎部材７２，７３は、燃料ガス３０１の噴出方向にて、拡幅部８４，８６の端面８４ｃ，８６ｃと燃料ノズル６１の開口部６１ｂが同位置となっている。第１保炎部材７１は、第１拡幅部８２の端面８２ｃが燃料ノズル６１の開口部６１ｂ（拡幅部８４，８６の端面８４ｃ，８６ｃ）に対して燃料ガス３０１の噴出方向の上流側に所定距離Ｌだけ離間した位置に配置されている。 In the fuel nozzle 61, first, second and third flame stabilizing members 71, 72 and 73 as the flame stabilizer 64 are disposed at predetermined intervals in the width direction (horizontal direction). The second and third flame stabilizing members 72 and 73 are provided with widening portions 84 and 86 at their tip portions, respectively, and in the widening portions 84 and 86, the end faces 84c and 86c correspond to the opening of the fuel nozzle 61. 61 b and the same position in the flow direction of the fuel gas 301 are arranged on the same plane. On the other hand, the first flame stabilizing member 71 is provided with a first widening portion 82 at its front end portion, and the first widening portion 82 has an end face 82c in the ejection direction of the fuel gas 301 from the opening 61b of the fuel nozzle 61. It is located upstream. That is, in the second and third flame stabilizing members 72 and 73, the end faces 84c and 86c of the widened portions 84 and 86 and the opening 61b of the fuel nozzle 61 are at the same position in the ejection direction of the fuel gas 301. In the first flame stabilizing member 71, the end face 82c of the first widening part 82 is predetermined on the upstream side of the fuel gas 301 in the ejection direction with respect to the opening 61b of the fuel nozzle 61 (the end faces 84c and 86c of the widening parts 84 and 86). It is disposed at a position separated by a distance L.
　第１、第２、第３保炎部材７１，７２，７３は、後部の上端部と下端部が支持部材８７，８８を介して燃料ノズル６１の内壁面６１ａに溶接などを用いて支持されている。各支持部材８７，８８は、燃料ノズル６１の内壁面６１ａにおける上部と下部に固定されており、第１、第２、第３保炎部材７１，７２，７３の上端部と下端部がこの支持部材８７，８８に支持されている。 The first, second, and third flame stabilizing members 71, 72, 73 are supported by welding or the like on the inner wall surface 61a of the fuel nozzle 61 via the supporting members 87, 88 at the upper end and lower end of the rear portion There is. The support members 87 and 88 are fixed to the upper and lower portions of the inner wall surface 61a of the fuel nozzle 61, and the upper and lower end portions of the first, second and third flame stabilizing members 71, 72 and 73 support this support. It is supported by members 87 and 88.
　この場合、第１、第２、第３保炎部材７１，７２，７３は、燃料ノズル６１の内壁面６１ａに固定された支持部材８７，８８に対して固定されている。但し、この構成に限定されるものではない。例えば、第１保炎部材７１は、第１拡幅部８２の端面８２ｃが燃料ノズル６１の開口部６１ｂより所定距離Ｌだけ後退した位置に配置されている。第１拡幅部８２の位置は、燃料の種類や噴出量などに応じて所定距離Ｌを変更することが考えられる。そのため、第１保炎部材７１を燃料ガス３０１の噴出方向に沿って位置調整自在に設けることが望ましい。 In this case, the first, second, and third flame stabilizing members 71, 72, 73 are fixed to the support members 87, 88 fixed to the inner wall surface 61 a of the fuel nozzle 61. However, the present invention is not limited to this configuration. For example, the first flame stabilizing member 71 is disposed at a position where the end surface 82 c of the first wide portion 82 is retracted by a predetermined distance L from the opening 61 b of the fuel nozzle 61. It is conceivable to change the predetermined distance L of the position of the first widening portion 82 in accordance with the type of fuel, the amount of ejection, and the like. Therefore, it is desirable to provide the first flame stabilizing member 71 so as to be adjustable in position along the ejection direction of the fuel gas 301.
　燃料ノズル６１は、保炎器６４として第１、第２、第３保炎部材７１，７２，７３が支持部材８７，８８に支持されていることから、燃料ガス流路Ｐ１が６個の領域に分割されることとなる。即ち、燃料ガス流路Ｐ１は、第３保炎部材７３と各第１保炎部材７１との間の第１燃料ガス流路Ｐ１１と、第１保炎部材７１と第２保炎部材７２の間の第２燃料ガス流路Ｐ１２と、第２保炎部材７２と燃料ノズル６１の内壁面６１ａとの間の第３燃料ガス流路Ｐ１３とに分割される。 In the fuel nozzle 61, the first, second, and third flame stabilizing members 71, 72, 73 are supported by the supporting members 87, 88 as the flame holder 64, so that the area where the fuel gas flow path P1 has six is provided. It will be divided into That is, the fuel gas flow path P 1 includes the first fuel gas flow path P 11 between the third flame holding member 73 and each of the first flame holding members 71, the first flame holding member 71 and the second flame holding member 72. And the third fuel gas flow path P13 between the second flame holding member 72 and the inner wall surface 61a of the fuel nozzle 61.
　なお、各支持部材８７，８８は、各保炎部材７１，７２，７３を支持するものであることから、燃料ガス３０１の流れに影響を与えるものではなく、各保炎部材７１，７２，７３の幅（厚さ）よりも極力小さい幅（薄い厚さ）に設定されている。また、支持部材８７，８８により各保炎部材７１，７２，７３を支持する周方向の支持位置は、実施形態に限るものではない。 In addition, since the support members 87 and 88 support the flame stabilizing members 71, 72, 73, they do not affect the flow of the fuel gas 301, and the flame retaining members 71, 72, 73 The width (thickness) is set to be as small as possible (thin thickness). Further, the circumferential support position where the flame stabilizing members 71, 72, 73 are supported by the supporting members 87, 88 is not limited to the embodiment.
　そして、幾つかの実施形態では、第２保炎部材７２及び第３保炎部材７３は、平坦部８３，８５があるものの、第２保炎部材７２と第３保炎部材７３の間に配置された第１保炎部材７１は、平坦部がなくて第１拡幅部８２のみで構成されている。そのため、第１保炎部材７１が小型化され、各保炎部材７１，７２，７３の後方に作業空間部が確保される。作業者は、燃料ノズル６１の基端部側から各保炎部材７１，７２，７３にアクセスすることができ、容易に保炎器６４の清掃、補修、交換などのメンテナンス作業を実施することができる。 And in some embodiments, the second flame stabilizing member 72 and the third flame stabilizing member 73 are disposed between the second flame stabilizing member 72 and the third flame stabilizing member 73 although the flat portions 83 and 85 are present. The first flame stabilizing member 71 does not have a flat portion and is constituted only by the first widening portion 82. Therefore, the first flame stabilizing member 71 is miniaturized, and a working space is secured behind each of the flame stabilizing members 71, 72, 73. The operator can access the flame stabilizing members 71, 72, 73 from the base end side of the fuel nozzle 61, and can easily carry out maintenance work such as cleaning, repair, and replacement of the flame holder 64. it can.
　図３は、その他の実施形態に係る燃焼バーナの構成を示す水平断面図である。なお、上述した実施形態と同様の機能を有する部材には、同一の符号を付して詳細な説明は省略する。 FIG. 3 is a horizontal sectional view showing the configuration of a combustion burner according to another embodiment. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　図３に示す一実施形態に係る燃焼バーナ２１Ａは、中心側から燃料ノズル６１と、燃焼用空気ノズル６２と、２次空気ノズル６３が設けられると共に、燃料ノズル６１内に保炎器６４Ａが設けられている。 The combustion burner 21A according to the embodiment shown in FIG. 3 is provided with a fuel nozzle 61, a combustion air nozzle 62, and a secondary air nozzle 63 from the center side, and a flame holder 64A is provided in the fuel nozzle 61. It is done.
　保炎器６４Ａは、２個の第１保炎部材７１と、２個の第２保炎部材７２と、１個の第３保炎部材７３とから構成されている。この第１保炎部材７１と第２保炎部材７２と第３保炎部材７３は、燃料ガス３０１の流動方向に沿うと共に鉛直方向に沿って配置されると共に、水平方向に所定間隔を空けて配置されている。 The flame holder 64A is configured of two first flame holding members 71, two second flame holding members 72, and one third flame holding member 73. The first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 are disposed along the flow direction of the fuel gas 301 and along the vertical direction, and at predetermined intervals in the horizontal direction. It is arranged.
　第１保炎部材７１は、水平方向に沿って破断した断面形状にて、幅が燃料ガス３０１の流れ方向の下流側に向けて拡大する第１拡幅部８２を有し、第１拡幅部８２は、三角柱形状をなしている。即ち、第１拡幅部８２は、第１ガイド面８２ａと、第２ガイド面８２ｂと、端面８２ｃとを有している。第２保炎部材７２は、水平方向に沿って破断した断面形状にて、幅が一定な第２平坦部８３と、この第２平坦部８３の前端部に一体に設けられて幅が燃料ガス３０１の流れ方向の下流側に向けて拡大する第２拡幅部８４とから構成されている。第２平坦部８３は、燃料ガス３０１の流れ方向に沿って幅が一定である。第２拡幅部８４は、第１ガイド面８４ａと、端面８４ｃとを有している。 The first flame stabilizing member 71 has a first widening portion 82 whose width is expanded toward the downstream side in the flow direction of the fuel gas 301 in a cross-sectional shape broken along the horizontal direction, and the first widening portion 82 Is in the shape of a triangular prism. That is, the first wide portion 82 includes the first guide surface 82a, the second guide surface 82b, and the end surface 82c. The second flame stabilizing member 72 is integrally provided at the front end portion of the second flat portion 83 having a constant width and a front end portion of the second flat portion 83 in a sectional shape broken along the horizontal direction, and the width is a fuel gas A second widening portion 84 is formed to expand toward the downstream side in the flow direction of the line 301. The second flat portion 83 has a constant width along the flow direction of the fuel gas 301. The second widening portion 84 has a first guide surface 84 a and an end surface 84 c.
　第３保炎部材７３は、水平方向に沿って幅が燃料ガス３０１の流れ方向の下流側に向けて拡大する第３拡幅部８６を有し、第３拡幅部８６は、三角柱形状をなしている。即ち、第３拡幅部８６は、水平断面が略二等辺三角形状をなし、一方の第１保炎部材７１側に傾斜する第１ガイド面８６ａと、他方の第１保炎部材７１側に傾斜する第２ガイド面８６ｂと、前端側の端面８６ｃとを有している。 The third flame stabilizing member 73 has a third widening portion 86 whose width extends toward the downstream side of the flow direction of the fuel gas 301 along the horizontal direction, and the third widening portion 86 has a triangular prism shape. There is. That is, the third widening portion 86 has a horizontal cross section in the form of a substantially isosceles triangle, and is inclined to the first guide surface 86 a that is inclined toward the one first flame stabilizing member 71 and to the other first flame stabilizing member 71. And an end surface 86c on the front end side.
　このように本実施形態の燃焼バーナにあっては、第１保炎部材７１は、水平方向に所定間隔を空けて複数設けられ、第２保炎部材７２は、第１保炎部材７１より燃料ノズル６１の内壁面６１ａ側の両側に所定間隔を空けて設けられ、複数の第１保炎部材７１の間に第３保炎部材７３が配置され、第３保炎部材７３は、燃料ガス３０１の流れ方向の下流側に向けて拡幅する第３拡幅部８６のみを有する。 As described above, in the combustion burner of the present embodiment, a plurality of first flame stabilizing members 71 are provided at predetermined intervals in the horizontal direction, and the second flame stabilizing members 72 are provided with fuel from the first flame stabilizing members 71. The third flame stabilizing member 73 is disposed between the plurality of first flame stabilizing members 71 and provided at predetermined intervals on both sides of the inner wall surface 61 a of the nozzle 61, and the third flame stabilizing member 73 includes fuel gas 301. Only the third widening portion 86 which widens toward the downstream side in the flow direction.
　従って、第１保炎部材７１と第２保炎部材７２と第３保炎部材７３を交互に所定間隔を空けて複数設け、中央に配置された第３保炎部材７３の平坦部をなくして第３拡幅部８６のみとすることで、作業者は、燃料ノズル６１の基端部側から作業空間部を介して中央部から保炎器６４Ａにアクセスすることができ、保炎器６４Ａの清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 Therefore, a plurality of first flame stabilizing members 71, second flame stabilizing members 72 and third flame stabilizing members 73 are alternately provided at predetermined intervals, and flat portions of the third flame stabilizing members 73 disposed at the center are eliminated. By using only the third widening portion 86, the operator can access the flame holder 64A from the central portion through the working space portion from the base end side of the fuel nozzle 61, and the cleaning of the flame holder 64A , Maintenance, replacement, etc. can be easily implemented.
　図４は、その他の一実施形態の燃焼バーナを表す水平断面図である。なお、上述した実施形態と同様の機能を有する部材には、同一の符号を付して詳細な説明は省略する。 FIG. 4 is a horizontal sectional view showing a combustion burner according to another embodiment. The members having the same functions as those in the above-described embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.
　燃焼バーナ２１Ｂは、図４に示すように、中心側から燃料ノズル６１と、燃焼用空気ノズル６２と、２次空気ノズル６３が設けられると共に、燃料ノズル６１内に保炎器６４Ｂが設けられている。 As shown in FIG. 4, the combustion burner 21B is provided with a fuel nozzle 61, a combustion air nozzle 62, and a secondary air nozzle 63 from the center side, and a flame holder 64B is provided in the fuel nozzle 61. There is.
　保炎器６４Ｂは、２個の第１保炎部材７１と、２個の第２保炎部材７２と、１個の第３保炎部材７３とから構成されている。この第１保炎部材７１と第２保炎部材７２と第３保炎部材７３は、燃料ガス３０１の流動方向に沿うと共に鉛直方向に沿って配置されると共に、水平方向に所定間隔を空けて配置されている。 The flame holder 64B is configured of two first flame holding members 71, two second flame holding members 72, and one third flame holding member 73. The first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 are disposed along the flow direction of the fuel gas 301 and along the vertical direction, and at predetermined intervals in the horizontal direction. It is arranged.
　第１保炎部材７１は、燃料ノズル６１の先端部であって、燃料ガス３０１の噴出方向に沿う中心線Ｏに対して径方向の両側で、且つ、燃料ノズル６１の内壁面６１ａから所定間隔を空けて配置されている。第２保炎部材７２は、燃料ノズル６１の先端部であって、各第１保炎部材７１に対して水平方向の外側の両側に所定間隔を空けて配置されると共に、燃料ノズル６１の内壁面６１ａから所定間隔を空けて配置されている。第３保炎部材７３は、燃料ノズル６１の先端部であって、燃料ガス３０１の噴出方向に沿う中心線Ｏ上で、且つ、各第１保炎部材７１から所定間隔を空けて配置されている。 The first flame stabilizing member 71 is a tip end portion of the fuel nozzle 61, and has a predetermined distance from the inner wall surface 61a of the fuel nozzle 61 on both sides in the radial direction with respect to the center line O along the ejection direction of the fuel gas 301. It is arranged with an empty space. The second flame stabilizing member 72 is a tip end portion of the fuel nozzle 61 and is disposed at a predetermined interval on both sides of each first flame stabilizing member 71 in the horizontal direction. It is arrange | positioned at predetermined intervals from the wall surface 61a. The third flame stabilizing member 73 is a tip end portion of the fuel nozzle 61, and is disposed on the center line O along the ejection direction of the fuel gas 301 and at a predetermined interval from the respective first flame stabilizing members 71. There is.
　また、第１保炎部材７１は、水平方向に沿って破断した断面形状にて、幅が一定な第１平坦部８１と、この第１平坦部８１の前端部に一体に設けられた第１拡幅部８２とから構成されている。第１平坦部８１は、燃料ガス３０１の流れ方向に沿って幅が一定である。第１拡幅部８２は、燃料ガス３０１の流れ方向に向かって幅が大きくなる。この第１拡幅部８２は、水平断面が略二等辺三角形状をなし、基端部が第１平坦部８１に連結され、先端部が燃料ガス３０１の流れ方向の下流側に向って幅が広くなり、前端がこの燃料ガス３０１の流れ方向に直交する平面となっている。即ち、第１拡幅部８２は、幅方向の内側に傾斜する第１ガイド面８２ａと、幅方向の外側に傾斜する第２ガイド面８２ｂと、前端側の端面８２ｃとを有している。 Further, the first flame stabilizing member 71 has a first flat portion 81 having a constant width and a first flat portion 81 integrally provided at a front end portion of the first flat portion 81 in a sectional shape broken along the horizontal direction. A wide portion 82 is formed. The first flat portion 81 has a constant width along the flow direction of the fuel gas 301. The width of the first widening portion 82 increases in the flow direction of the fuel gas 301. The first widening portion 82 has a horizontal cross section in a substantially isosceles triangle shape, the base end portion is connected to the first flat portion 81, and the tip end portion is wide toward the downstream side in the flow direction of the fuel gas 301 The front end is a plane perpendicular to the flow direction of the fuel gas 301. That is, the first wide portion 82 has a first guide surface 82a inclined inward in the width direction, a second guide surface 82b inclined outward in the width direction, and an end surface 82c on the front end side.
　第２保炎部材７２は、水平方向に沿って破断した断面形状にて、幅が燃料ガス３０１の流れ方向の下流側に向けて拡大する第２拡幅部８４を有し、第２拡幅部８４は、三角柱形状をなしている。即ち、第２拡幅部８４は、水平断面が略二等辺三角形状をなし、幅方向の内側に傾斜する第１ガイド面８４ａと、前端側の燃料ガス３０１の流れ方向に直交する端面８４ｃとを有しており、幅方向の外側にはガイド面がなく、燃料ガス３０１の流れ方向に沿う平面となっている。 The second flame stabilizing member 72 has a second widening portion 84 whose width is expanded toward the downstream side in the flow direction of the fuel gas 301 in a cross-sectional shape broken along the horizontal direction, and the second widening portion 84 Is in the shape of a triangular prism. That is, the second widening portion 84 has a first guide surface 84a whose horizontal cross section has a substantially isosceles triangle shape and is inclined inward in the width direction, and an end surface 84c orthogonal to the flow direction of the fuel gas 301 on the front end side. There is no guide surface on the outer side in the width direction, and it is a plane along the flow direction of the fuel gas 301.
　第３保炎部材７３は、水平方向に沿って破断した断面形状にて、幅が燃料ガス３０１の流れ方向の下流側に向けて拡大する第３拡幅部８６を有し、第３拡幅部８６は、三角柱形状をなしている。即ち、第３拡幅部８６は、水平断面が略二等辺三角形状をなし、一方の第１保炎部材７１側に傾斜する第１ガイド面８６ａと、他方の第１保炎部材７１側に傾斜する第２ガイド面８６ｂと、前端側の端面８６ｃとを有している。 The third flame stabilizing member 73 has a third widening portion 86 whose width extends toward the downstream side of the flow direction of the fuel gas 301 in a cross-sectional shape broken along the horizontal direction, and the third widening portion 86 Is in the shape of a triangular prism. That is, the third widening portion 86 has a horizontal cross section in the form of a substantially isosceles triangle, and is inclined to the first guide surface 86 a that is inclined toward the one first flame stabilizing member 71 and to the other first flame stabilizing member 71. And an end surface 86c on the front end side.
　このように本実施形態の燃焼バーナにあっては、第１保炎部材７１は、第１平坦部８１と第１拡幅部８２とを有し、第２保炎部材７２は、第２拡幅部８４のみを有する。 As described above, in the combustion burner of the present embodiment, the first flame stabilizing member 71 has the first flat portion 81 and the first widening portion 82, and the second flame stabilizing member 72 is the second widening portion. It has only 84.
　従って、燃料ガス３０１の噴出方向下流側に設けられる第２保炎部材７２の平坦部をなくして第２拡幅部８４のみとすることで、燃料ノズル内に作業l空間部を確保することができる。このため、メンテナンス作業者は燃料ノズル６１の基端部側から作業空間部を介して保炎器６４Ｂにアクセスすることができ、保炎器６４Ｂの清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 Therefore, by eliminating the flat portion of the second flame stabilizing member 72 provided on the downstream side of the fuel gas 301 in the ejection direction and using only the second widening portion 84, the working space can be secured in the fuel nozzle. . Therefore, the maintenance worker can access the flame holder 64B from the base end side of the fuel nozzle 61 through the working space, facilitating maintenance work such as cleaning, repair and replacement of the flame holder 64B. It can be implemented.
　なお、上述した本実施形態では、第１保炎部材７１の平坦部をなくして第１拡幅部８２のみとした構成、その他の一実施形態では、第１保炎部材７１と第３保炎部材７３の平坦部をなくして第２、第３拡幅部８４，８６のみとした構成、その他の一実施形態では、第２保炎部材７２と第３保炎部材７３の平坦部をなくして拡幅部８４，８６のみとした構成を示したが、本発明はこれら構成に限定されるものではない。例えば、第１保炎部材７１と第２保炎部材７２を平坦部と拡幅部から構成し、第３保炎部材７３の平坦部をなくして拡幅部のみとしてもよい。 In the above-described embodiment, the flat portion of the first flame stabilizing member 71 is eliminated and only the first widening portion 82 is used. In another embodiment, the first flame stabilizing member 71 and the third flame stabilizing member are used. In the configuration in which the flat portion of 73 is eliminated and only the second and third widening portions 84 and 86 are provided, and in the other embodiment, the flat portions of the second flame stabilizing member 72 and the third flame stabilizing member 73 are eliminated and the widening portion Although the configurations having only 84 and 86 are shown, the present invention is not limited to these configurations. For example, the first flame stabilizing member 71 and the second flame stabilizing member 72 may be formed of a flat portion and a widening portion, and the flat portion of the third flame stabilizing member 73 may be eliminated to form only the widening portion.
　また、上述した実施形態では、第１保炎部材７１と第２保炎部材７２と第３保炎部材７３のいずれかの平坦部をなくして拡幅部のみとしたが、第１保炎部材７１と第２保炎部材７２と第３保炎部材７３の全ての平坦部をなくして拡幅部のみとしてもよい。即ち、第１保炎部材７１は、燃料ガス３０１の流れ方向の下流側に向けて拡幅する第１拡幅部８２のみを有し、第２保炎部材７２は、燃料ガス３０１の流れ方向の下流側に向けて拡幅する第２拡幅部８４のみを有し、第３保炎部材７３は、燃料ガス３０１の流れ方向の下流側に向けて拡幅する第３拡幅部８６のみを有する。従って、作業者は、燃料ノズル６１の基端部側から大きな作業空間部を介して保炎器６４にアクセスすることができ、保炎器６４の清掃、補修、交換などのメンテナンス作業を容易に実施することができる。 In the embodiment described above, the flat portion of any of the first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 is eliminated and only the widening portion is provided. Alternatively, all flat portions of the second flame stabilizing member 72 and the third flame stabilizing member 73 may be eliminated and only the widening portion may be provided. That is, the first flame stabilizing member 71 has only the first widening portion 82 which widens toward the downstream side of the flow direction of the fuel gas 301, and the second flame stabilizing member 72 is downstream of the flow direction of the fuel gas 301 The third flame stabilizing member 73 has only the third widening portion 86 widening toward the downstream side in the flow direction of the fuel gas 301. Therefore, the worker can access the flame holder 64 from the base end side of the fuel nozzle 61 through the large working space, and facilitates maintenance work such as cleaning, repair, and replacement of the flame holder 64. It can be implemented.
　また、上述した実施形態では、保炎器６４，６４Ａ，６４Ｂとして、２個の第１保炎部材７１と２個の第２保炎部材７２と１個の第３保炎部材７３を設けたが、この構成に限定されるものではない。例えば、保炎器を２個の第１保炎部材と２個の第２保炎部材から構成したり、保炎器を２個の第１保炎部材と１個の第３保炎部材から構成したりしてもよい。また、第１保炎部材の数は、１個または２個に限らず、３個以上設けてもよい。 Moreover, in the embodiment described above, two first flame holding members 71, two second flame holding members 72, and one third flame holding member 73 are provided as the flame holder 64, 64A, 64B. However, it is not limited to this configuration. For example, the flame holder may be composed of two first flame holding members and two second flame holding members, or the flame holder may be composed of two first flame holding members and one third flame holding member. It may be configured. Further, the number of first flame stabilizing members is not limited to one or two, and three or more may be provided.
　また、上述した実施形態では、燃料ノズル６１と燃焼用空気ノズル６２と２次空気ノズル６３を矩形状としたが、この形状に限るものではなく、円形状としてもよい。 Further, in the embodiment described above, the fuel nozzle 61, the combustion air nozzle 62, and the secondary air nozzle 63 are rectangular, but the present invention is not limited to this shape, and may be circular.
　また、上述した実施形態では、第１保炎部材７１と第２保炎部材７２と第３保炎部材７３を燃料ガス３０１の流れ方向に沿うと共に、鉛直方向に沿って配置したが、第１保炎部材７１と第２保炎部材７２と第３保炎部材７３を燃料ガス３０１の流れ方向に沿うと共に、水平方向に沿って配置してもよい。 In the embodiment described above, the first flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 are disposed along the flow direction of the fuel gas 301 and along the vertical direction. The flame stabilizing member 71, the second flame stabilizing member 72, and the third flame stabilizing member 73 may be disposed along the flow direction of the fuel gas 301 and along the horizontal direction.
　また、上述した実施形態では、本発明のボイラを石炭焚きボイラとしたが、固体燃料としては、バイオマスや石油コークス、石油残渣などを使用するボイラであってもよい。また、燃料として固体燃料に限らず、重質油などの油焚きボイラにも使用することができる。さらには、これら燃料の混焼焚きにも適用することができる。 In the above-described embodiment, the boiler of the present invention is a coal-fired boiler, but as the solid fuel, a boiler using biomass, petroleum coke, petroleum residue or the like may be used. Moreover, it can be used not only for solid fuel as fuel but for oil-fired boilers, such as heavy oil. Furthermore, it can be applied to mixed burning of these fuels.
　２１，２１Ａ，２１Ｂ　燃焼バーナ
　６１　燃料ノズル
　６１ａ　内壁面
　６１ｂ，６２ｂ，６３ｅ　開口部（噴出開口部）
　６２　燃焼用空気ノズル
　６３　２次空気ノズル
　６４，６４Ａ，６４Ｂ　保炎器
　７１　第１保炎部材
　７２　第２保炎部材
　７３　第３保炎部材
　８１　第１平坦部
　８２　第１拡幅部
　８２ａ，８４ａ，８６ａ　第１ガイド面
　８２ｂ，８６ｂ　第２ガイド面
　８２ｃ，８４ｃ，８６ｃ　端面
　８３　第２平坦部
　８４　第２拡幅部
　８５　第３平坦部
　８６　第３拡幅部
　８７，８８　支持部材
　Ｐ１　燃料ガス流路
　Ｐ１１　第１燃料ガス流路
　Ｐ１２　第２燃料ガス流路
　Ｐ１３　第３燃料ガス流路
　Ｐ２　燃焼用空気流路
　Ｐ３　２次空気流路 21, 21A, 21B Combustion burner 61 Fuel nozzle 61a Inner wall surface 61b, 62b, 63e Opening (jet opening)
62 combustion air nozzle 63 secondary air nozzle 64, 64A, 64B flame holder 71 1st flame holding member 72 2nd flame holding member 73 3rd flame holding member 81 1st flat part 82 1st widening part 82a, 84a, 86a first guide surface 82b, 86b second guide surface 82c, 84c, 86c end surface 83 second flat portion 84 second wide portion 85 third flat portion 86 third wide portion 87, 88 support member P1 fuel gas flow path P11 1 Fuel gas passage P12 Second fuel gas passage P13 Third fuel gas passage P2 Combustion air passage P3 Secondary air passage

Claims (8)

  1. 　燃料と空気とを混合した燃料ガスを噴出する燃料ノズルと、
    　前記燃料ノズルの外側から空気を噴出する燃焼用空気ノズルと、
    　前記燃料ノズルの噴出開口部より燃料ガスの噴出方向上流側に配置されて前記燃料ガスの噴出方向を拡幅する第１保炎部材と、
    　前記第１保炎部材より前記燃料ガスの噴出方向下流側で且つ前記第１保炎部材に隣接して配置されて前記燃料ガスの噴出方向を拡幅する第２保炎部材と、
    　を備え、
    　前記第１保炎部材と前記第２保炎部材の少なくとも一方は、燃料ガスの流れ方向の下流側に向けて拡幅する拡幅部のみを有する、
    　ことを特徴とする燃焼バーナ。     A fuel nozzle that ejects a fuel gas that is a mixture of fuel and air;
    A combustion air nozzle that ejects air from the outside of the fuel nozzle;
    A first flame-holding member disposed upstream of the ejection opening of the fuel nozzle in the ejection direction of the fuel gas to widen the ejection direction of the fuel gas;
    A second flame-holding member disposed downstream of the first flame-holding member in the ejection direction of the fuel gas and adjacent to the first flame-holding member to widen the ejection direction of the fuel gas;
    Equipped with
    At least one of the first flame stabilizing member and the second flame stabilizing member has only a widening portion that widens toward the downstream side in the flow direction of the fuel gas.
    A combustion burner characterized by
  2. 　前記第１保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第１拡幅部のみを有し、
    　前記第２保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第２拡幅部と、前記第２拡幅部より燃料ガスの流れ方向の上流側に連結される第２平坦部とを有することを特徴とする請求項１に記載の燃焼バーナ。     The first flame stabilizing member has only a first widening portion that widens toward the downstream side in the flow direction of the fuel gas,
    The second flame stabilizing member includes a second widening portion which widens toward the downstream side in the flow direction of the fuel gas, and a second flat portion connected to the upstream side in the flow direction of the fuel gas from the second widening portion. The combustion burner according to claim 1, comprising:
  3. 　前記第１保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第１拡幅部と、前記第１拡幅部より燃料ガスの流れ方向の上流側に連結される第１平坦部とを有し、
    　前記第２保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第２拡幅部のみを有することを特徴とする請求項１に記載の燃焼バーナ。     The first flame stabilizing member includes a first widening portion that widens toward the downstream side in the flow direction of the fuel gas, and a first flat portion connected to the upstream side in the flow direction of the fuel gas from the first widening portion Have
    The combustion burner according to claim 1, wherein the second flame stabilizing member has only a second widening portion which widens toward the downstream side in the flow direction of the fuel gas.
  4. 　前記第１保炎部材は、水平方向または鉛直方向に所定間隔を空けて複数設けられ、前記第２保炎部材は、前記第１保炎部材より前記燃料ノズルの内壁面側の両側に所定間隔を空けて設けられ、複数の前記第１保炎部材の間に第３保炎部材が配置され、
    　前記第３保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第３拡幅部のみを有することを特徴とする請求項２または請求項３に記載の燃焼バーナ。     A plurality of the first flame stabilizing members are provided at predetermined intervals in the horizontal direction or the vertical direction, and the second flame stabilizing members are disposed at predetermined intervals on both sides of the first flame stabilizing member on the inner wall surface side of the fuel nozzle. And a third flame stabilizing member is disposed between the plurality of first flame stabilizing members,
    The combustion burner according to claim 2 or 3, wherein the third flame stabilizing member includes only a third widening portion that widens toward the downstream side in the flow direction of the fuel gas.
  5. 　前記第１保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第１拡幅部のみを有し、
    　前記第２保炎部材は、燃料ガスの流れ方向の下流側に向けて拡幅する第２拡幅部のみを有することを特徴とする請求項１に記載の燃焼バーナ。     The first flame stabilizing member has only a first widening portion that widens toward the downstream side in the flow direction of the fuel gas,
    The combustion burner according to claim 1, wherein the second flame stabilizing member has only a second widening portion which widens toward the downstream side in the flow direction of the fuel gas.
  6. 　前記第２保炎部材は、前記第１保炎部材の拡幅方向の両側に配置され、前記第１保炎部材は、燃料ガスの噴出方向を２方向に拡幅する前記第１拡幅部が設けられ、前記燃料ノズルの内壁面側に配置される前記第２保炎部材は、前記燃料ノズルにおける軸線中心側のみに燃料ガスの噴出方向を拡幅する前記第２拡幅部が設けられることを特徴とする請求項２から請求項５のいずれか一項に記載の燃焼バーナ。 The second flame stabilizing member is disposed on both sides in the widthwise direction of the first flame stabilizing member, and the first flame stabilizing member is provided with the first flared portion that widens the fuel gas ejection direction in two directions. The second flame stabilizing member disposed on the inner wall surface side of the fuel nozzle is characterized in that the second widening portion which widens the jet direction of the fuel gas is provided only on the axial center side of the fuel nozzle. The combustion burner according to any one of claims 2 to 5.
  7. 　請求項１から請求項６のいずれか一項に記載の燃焼バーナが周方向に所定間隔を空けて複数配置されて火炎旋回流を形成する、
    　ことを特徴とする燃焼装置。     A plurality of combustion burners according to any one of claims 1 to 6 are disposed circumferentially at predetermined intervals to form a flame swirl flow.
    A combustion apparatus characterized by
  8. 　中空形状をなして鉛直方向に沿って設置される火炉と、
    　請求項７に記載の燃焼装置と、
    　を備えることを特徴とするボイラ。     A furnace having a hollow shape and installed along the vertical direction,
    A combustion device according to claim 7;
    A boiler comprising:
PCT/JP2018/033436 2018-01-23 2018-09-10 Combustion burner, combustion device, and boiler WO2019146154A1 (en)

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