JP2014112014A - Burner tip, combustion burner, and boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve combustibility by enhancing mixing of a fluid fuel and a spray medium in a mixing chamber, with respect to a burner tip, a combustion burner, and a boiler.SOLUTION: A burner tip is provided with a mixing chamber 54 disposed inside, a plurality of mixed fluid injection holes 52 formed on a tip end portion, a plurality of fuel supply passages 57 disposed along the longitudinal direction at a basic end side and supplying a fuel to the mixing chamber 54, a steam supply passage 58 disposed at an outer side with respect to the fuel supply passage 57, in a tip body 41, and supplying steam to the mixing chamber 54 from its outer side, and a guide member 61 disposed at a front side with respect to the fuel supply passage 57 and the steam supply passage 58 in the mixing chamber 54.

Description

  The present invention relates to a burner tip that is jetted in the form of a mist by mixing a fluid fuel and a spray medium, a combustion burner that forms a flame by a mixture of the fluid fuel and the spray medium ejected from the burner tip, and this combustion It relates to a boiler to which a burner is applied.

  A general oil-fired boiler has a furnace having a hollow shape and installed in a vertical direction, and a plurality of combustion burners are disposed on the furnace wall along the circumferential direction, and in a plurality of stages in the vertical direction. Has been placed. This combustion burner forms a flame by blowing the liquid fuel into the furnace in the state of being atomized by the spray medium, and can burn in the furnace. This furnace has a flue connected to the top, and this flue is provided with a superheater, reheater, economizer, etc. for recovering the heat of exhaust gas, and it was generated by combustion in the furnace. Heat exchange is performed between the exhaust gas and water, and steam can be generated.

  The combustion burner used in this oil-fired boiler is configured such that a burner tip is provided at the tip of a supply pipe for liquid fuel and spray medium. This burner tip can be ejected from a plurality of ejection holes formed at the tip after mixing the liquid fuel and the spray medium. When using fuel that generates a large amount of NOx and soot such as heavy fuel in the burner chip, it is necessary to ensure high combustibility and reduce NOx and soot. Therefore, it is conceivable to increase the number of ejection holes in the burner tip, but if the number of ejection holes is increased, the distance between adjacent ejection holes becomes shorter, and the jets interfere with each other to form a thin film. It is difficult to take in the air, which may cause poor ignition and poor combustion.

  An example of a burner chip that solves such a problem is described in Patent Document 1 below. The burner tip described in Patent Document 1 has a plurality of mixture ejection holes arranged in the radial direction and a plurality of mixture ejection hole groups arranged in the radial direction with a predetermined gap in the circumferential direction. .

JP 2010-127518 A

  As the burner tip, like the burner tip described in Patent Document 1 described above, the fuel injection hole is connected to the middle part of the mixture injection hole, so that the liquid fuel is mixed with the spray medium and then ejected. There is something to do. On the other hand, there is an internal mixing type burner tip in which the spray medium and liquid fuel are mixed in a mixing chamber provided therein and then ejected from the ejection holes. Even in this internal mixing type burner tip, as with the above-described burner tip, by arranging a plurality of the mixture injection holes with a predetermined gap in the radial direction and the circumferential direction, the atomization of the liquid fuel is improved. Thus, interference between the jets of the mixture can be prevented and the combustibility can be improved. However, in the case of an internal mixing type burner chip having a mixing chamber, the diffusion of the liquid fuel by the spray medium in the mixing chamber is insufficient.

  The present invention solves the above-described problems, and provides a burner tip, a combustion burner, and a boiler capable of improving combustibility by promoting mixing of fluid fuel and a spray medium in a mixing chamber. With the goal.

  In order to achieve the above object, a burner chip according to the present invention comprises a chip body, a mixing chamber provided inside the chip body, a base end portion communicating with the mixing chamber, and a tip portion being a tip of the chip body. A plurality of mixed fluid ejection holes arranged at predetermined intervals in the circumferential direction of the chip body, and provided along the longitudinal direction on the base end side of the chip body to supply fluid fuel to the mixing chamber A plurality of fluid fuel supply passages, a spray medium supply passage provided outside the fluid fuel supply passage in the chip body and supplying a spray medium from the outside to the mixing chamber, and the fluid fuel supply passage in the mixing chamber And a guide member disposed in front of the spray medium supply passage.

  Accordingly, since the guide member is arranged in front of the fluid fuel supply passage and the spray medium supply passage in the mixing chamber, the fluid fuel supplied from the fluid fuel supply passage to the mixing chamber and the mixing chamber from the spray medium supply passage The spray medium supplied to the gas is diffused by colliding with the guide member, so that the mixing is efficiently performed in the mixing chamber, and the mixing of the fluid fuel and the spray medium in the mixing chamber is promoted to improve the combustibility. Can be improved.

  In the burner tip according to the present invention, the guide surface of the guide member is arranged closer to the base end side of the mixing chamber than an intermediate position in the entire length of the mixing chamber.

  Accordingly, since the guide surface is disposed close to the base end side of the mixing chamber, the flow of the fluid fuel and the flow of the spray medium collide with the guide surface with a large amount of energy at an early stage. Thus, the fluid fuel and the spray medium can be mixed efficiently.

  In the burner tip of the present invention, the guide member is arranged to face the supply port of the fluid fuel supply passage.

  Therefore, by allowing the guide member to face the supply port of the fluid fuel supply passage, the fluid fuel can be diffused by appropriately colliding with the guide member, and can be efficiently mixed with the spray medium in this mixing chamber.

  In the burner tip of the present invention, the guide member is provided with a turning force applying mechanism for applying a turning force centering on an axis along the longitudinal direction of the tip body to the fluid fuel supplied from the fluid fuel supply passage. It is characterized by.

  Accordingly, by providing the guide member with a turning force applying mechanism for applying a turning force to the fluid fuel, the fluid fuel supplied from the fluid fuel supply passage to the mixing chamber is turned here by the turning force applying mechanism. The spray medium supplied from the spray medium supply passage to the mixing chamber can be efficiently mixed.

  In the burner tip according to the present invention, the guide surface of the guide member has a concave shape.

  Therefore, by making the guide surface into a concave shape, the fluid fuel and the spray medium supplied to the mixing chamber temporarily stay in the guide surface, and the fluid fuel and the spray medium are efficiently mixed in the mixing chamber. Can be made.

  In the burner tip according to the present invention, the guide surface of the guide member has a concave curved shape.

  Therefore, by making the guide surface into a concave curved shape, the fluid fuel and the spray medium supplied to the mixing chamber are temporarily retained by swirling along the guide surface, and the fluid fuel and the spray medium are retained in the mixing chamber. The spray medium can be mixed efficiently.

  In the burner tip of the present invention, the guide member is supported by a support member extending from the tip end side of the tip body.

  Therefore, by supporting the guide member from the tip end side in the chip body, the mixing of the fluid fuel and the spray medium by the guide member is not adversely affected, and the fluid fuel and the spray medium are efficiently mixed in the mixing chamber. be able to.

  In the burner tip of the present invention, the tip body is configured by connecting a spray plate provided with a mixed fluid ejection hole and a back plate provided with the fluid fuel supply passage and the spray medium supply passage, and the spray plate. The mixing chamber is partitioned by the back plate, and the guide member is supported by a support member extending from the back plate.

  Therefore, the structure of the spray plate and the back plate can be simplified and the cost can be reduced by dividing the chip body into the spray plate and the back plate and providing the guide member with the support member on the back plate side. .

  The combustion burner of the present invention is provided at a fluid fuel supply pipe capable of supplying fluid fuel, a spray medium supply pipe capable of supplying a spray medium, and the fluid fuel supply pipe and the tip of the spray medium supply pipe. A chip body, a mixing chamber provided inside the chip body, a base end portion communicating with the mixing chamber, and a distal end portion opening at a tip end of the chip body and arranged at predetermined intervals in the circumferential direction of the chip body A plurality of mixed fluid ejection holes, a plurality of fluid fuel supply passages provided along the longitudinal direction on the base end side of the tip body and supplying fluid fuel of the fluid fuel supply pipe to the mixing chamber; A spray medium supply passage provided outside the fluid fuel supply passage in the chip body and supplying a spray medium from the outside to the mixing chamber; the fluid fuel supply passage in the mixing chamber; and A guide member disposed on the front side of the fog medium supply passage, it is characterized in that it has a.

  Accordingly, the fluid fuel supplied from the fluid fuel supply passage to the mixing chamber and the spray medium supplied from the spray medium supply passage to the mixing chamber are efficiently mixed in the mixing chamber by the guide member. Combustibility can be improved by promoting mixing of the fluid fuel and the spray medium.

  In the boiler according to the present invention, the combustion burner is disposed on the furnace wall in a boiler that burns fuel and air in a hollow furnace and collects heat by exchanging heat in the furnace. It is characterized by this.

  Therefore, the fluid fuel and the spray medium are efficiently mixed in the mixing chamber by the guide member, and the combustibility can be improved by promoting the mixing of the fluid fuel and the spray medium in the mixing chamber.

  According to the burner tip, the combustion burner, and the boiler of the present invention, the guide member is disposed in front of the fluid fuel supply passage and the spray medium supply passage in the mixing chamber of the burner tip. Combustibility can be improved by promoting mixing.

1 is a cross-sectional view of a combustion burner having a burner tip according to a first embodiment of the present invention. FIG. 2 is a plan view of the combustion burner according to the first embodiment. 3 is a cross-sectional view taken along the line III-III of FIG. 1 in the combustion burner of the first embodiment. FIG. 4 is a schematic configuration diagram illustrating an oil-fired boiler as a boiler according to the first embodiment. FIG. 5 is a front view of a guide member mounted on the combustion burner according to the second embodiment of the present invention. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a front view of a guide member attached to the combustion burner according to the third embodiment of the present invention. FIG. 8 is a cross-sectional view of a combustion burner having a burner tip according to a fourth embodiment of the present invention. FIG. 9 is a cross-sectional view of a combustion burner having a burner tip according to a fifth embodiment of the present invention.

  Exemplary embodiments of a burner tip, a combustion burner, and a boiler according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  1 is a cross-sectional view of a combustion burner having a burner tip according to a first embodiment of the present invention, FIG. 2 is a plan view of the combustion burner of the first embodiment, and FIG. FIG. 4 is a schematic configuration diagram illustrating an oil-fired boiler as a boiler according to the first embodiment.

  The oil-fired boiler of Example 1 uses heavy oil (or light oil, coal slurry, etc.) as fluid fuel as fuel, and this heavy oil is vapor (or high pressure air) as a spray medium by a combustion burner (burner tip). It is a boiler that can be atomized with high-pressure gas, combustible gas, etc., sprayed, burned in a furnace, and recovering heat generated by this combustion.

  In Example 1, as shown in FIG. 4, the oil-fired boiler 10 is a conventional boiler, and includes a furnace 11 and a combustion device 12. The furnace 11 has a rectangular hollow shape and is installed along the vertical direction. A combustion device 12 is provided at the lower part of the furnace wall constituting the furnace 11.

  The combustion device 12 has a plurality of combustion burners 21 mounted on the furnace wall. In the first embodiment, the combustion burner 21 has, for example, four sets arranged at equal intervals along the circumferential direction as one set, for example, three sets, that is, three stages along the vertical direction. Has been placed. The location and number of the combustion burners 21 are not limited to this.

  Each combustion burner 21 is connected to a fuel supply source 23 via a fuel supply pipe 22, and a flow rate adjusting valve 24 capable of adjusting the fuel supply amount is provided in the fuel supply pipe 22. Each combustion burner 21 is connected to a steam supply source 26 via a steam supply pipe 25, and a flow rate adjusting valve 27 capable of adjusting the steam supply amount is provided in the steam supply pipe 25.

  Therefore, each combustion burner 21 is supplied with fuel from the fuel supply source 23 through the fuel supply pipe 22 and also supplied with steam from the steam supply source 26 through the steam supply pipe 25, mixing the fuel and steam. After atomization, it can be injected into the furnace 11 as a mixed fluid to form a flame.

  In the furnace 11, a flue 31 is connected to the upper part, and superheaters (super heaters) 32, 33 for recovering the heat of exhaust gas as a convection heat transfer part (heat recovery part) are connected to the flue 31. Heaters 34, 35 and economizers 36, 37, 38 are provided, and heat exchange is performed between exhaust gas generated by combustion in the furnace 11 and water.

  The flue 31 is connected to an exhaust gas pipe 39 through which exhaust gas subjected to heat exchange is discharged downstream. Although not shown, the exhaust gas pipe 39 is provided with a denitration device, an electrostatic precipitator, an induction blower, and a desulfurization device, and has a chimney at the downstream end.

  Therefore, when each combustion burner 21 injects the mixed fluid of fuel and steam into the furnace 11 in the combustion apparatus 12, the mixed fluid and air are burned in the furnace 11, and a flame is generated. When a flame is generated, combustion gas (exhaust gas) rises in the furnace 11 and is discharged to the flue 31.

  At this time, while water supplied from a water supply pump (not shown) is preheated by the economizers 36, 37, and 38, it is supplied to a steam drum (not shown) and supplied to each water pipe (not shown) on the furnace wall. Is heated to become saturated steam and fed into a steam drum (not shown). Further, saturated steam of a steam drum (not shown) is introduced into the superheaters 32 and 33 and is heated by the combustion gas. The superheated steam generated by the superheaters 32 and 33 is supplied to a power plant (not shown) (for example, a turbine). Further, the steam taken out during the expansion process in the turbine is introduced into the reheaters 34 and 35, overheated again, and returned to the turbine. In addition, although the furnace 11 was demonstrated as a drum type | mold (steam drum), it is not limited to this structure.

  Thereafter, the exhaust gas that has passed through the economizers 36, 37, and 38 of the flue 31 is removed with harmful substances such as NOx by a catalyst in a denitration device (not shown) in the exhaust gas pipe 39, and the particulate matter is collected by an electric dust collector. Is removed, and after the sulfur content is removed by the desulfurizer, it is discharged from the chimney into the atmosphere.

  Here, although the combustion apparatus 12 is demonstrated in detail, each combustion burner 21 which comprises this combustion apparatus 12 has comprised the substantially the same structure.

  As shown in FIGS. 1 to 3, the combustion burner 21 includes a fuel supply pipe (fluid fuel supply pipe) 22 capable of supplying fuel, a steam supply pipe (spray medium supply pipe) 25 capable of supplying steam, a fuel It has a burner tip 41 capable of ejecting a fluid mixture of (fluid fuel) and steam (atomizing medium). In this case, the fuel supply pipe 22 and the steam supply pipe 25 are double pipes. The fuel supply pipe 22 is located inside, and the steam supply pipe 25 is arranged outside the fuel supply pipe 22, thereby supplying fuel. A path 22a and a steam supply path 25a are formed. And the burner chip | tip 41 is attached to the front-end | tip part of this double pipe (fuel supply piping 22, steam supply piping 25) so that replacement | exchange is possible.

  The burner chip 41 is composed of a spray plate 42 and a back plate 43 as chip bodies, and is integrally connected by a fastening ring (not shown).

  The spray plate 42 has a cylindrical shape in which the base end (right side in FIG. 1) is open and the tip end (left side in FIG. 1) is closed, and has a cylindrical shape so as to open to the base end portion. A first recess 51 is formed. Further, the spray plate 42 has a plurality of mixed fluid ejection holes 52 formed at the tip. The mixed fluid ejection holes 52 have a proximal end portion communicating with the first recess 51 and a distal end portion opened to the outside, and a plurality of mixed fluid ejection holes 52 at equal intervals in the circumferential direction around the axis of the burner tip 41 (in this embodiment). 10).

  The back plate 43 has a disk shape, and a second recess 53 having a cylindrical shape is formed at the tip. The second recess 53 formed in the back plate 43 is opposed to the first recess 51 formed in the spray plate 42, and the recesses 51 and 53 are set to have substantially the same diameter. In the present embodiment, the first recess 51 and the second recess 53 form a mixing chamber 54, and each mixed fluid ejection hole 52 is in communication with the mixing chamber 54 at the base end.

  In the back plate 43, an ejection chamber 55 is formed in a ring shape along the circumferential direction on the outer peripheral side of the second recess 53 (mixing chamber 54). The ejection chamber 55 communicates with the second recess 53 (mixing chamber 54) via a plurality (eight in this embodiment) of communication passages 56. That is, each communication path 56 is formed along the radial direction (radial direction) of the back plate 43, one end communicates with the inner peripheral surface of the ejection chamber 55, and the other end communicates with the outer peripheral surface of the second recess 53. Communicate.

  Further, the back plate 43 is connected to the fuel supply pipe 22 (fuel supply path 22a) and the steam supply pipe 25 (steam supply path 25a) at the base end. The back plate 43 is provided with a plurality of fuel supply passages (fluid fuel supply passages) 57 for supplying fuel from the fuel supply passage 22 a to the mixing chamber 54. Each of the fuel supply passages 57 is provided in the back plate 43 along the longitudinal direction thereof, the base end portion thereof communicates with the fuel supply passage 22a, and the distal end portion thereof communicates with the second concave portion 53. 54 can be supplied with fuel.

  Each back plate 43 is provided with a plurality of steam supply passages (spray medium supply passages) 58 for supplying steam from the steam supply passage 25a to the mixing chamber 54 from the outer peripheral side thereof. Each of the steam supply passages 58 is provided in the back plate 43 along the longitudinal direction, the base end portion communicates with the steam supply passage 25a, and the distal end portion communicates with the ejection chamber 55. Steam can be supplied to the mixing chamber 54 through 56.

  Therefore, the fuel in the fuel supply path 22 a passes through the plurality of fuel supply paths 57 and supplies the fuel to the mixing chamber 54 along the axial direction of the burner tip 41. On the other hand, the steam in the steam supply path 25 a is supplied to the ejection chamber 55 through the plurality of steam supply passages 58, and from the ejection chamber 55 through the plurality of communication passages 56, the steam of the burner chip 41 to the mixing chamber 54. Steam can be supplied along the radial direction.

  In the burner tip 41, a guide member 61 is disposed on the front side (mixed fluid ejection hole 52 side) of the fuel supply passage 57 and the steam supply passage 58 in the mixing chamber 54. The guide member 61 has a disk shape and is supported by a support rod (support member) 62 that extends rearward from the tip end side of the spray plate 42 constituting the burner chip 41.

  The guide member 61 has a guide surface 63 facing the supply port side of the fuel supply passage 57, and the guide surface 63 is on the base end side (back plate) of the mixing chamber 54 with respect to the intermediate position in the entire length L of the mixing chamber 54. 43 side). Specifically, it is desirable that the guide surface 63 be positioned at L / 4 or less from the base end side (back plate 43 side) of the mixing chamber 54 with respect to the total length L of the mixing chamber 54. Further, the guide surface 63 is disposed so as to face the supply port of the fuel supply passage 57, and the opening area of the supply port of the fuel supply passage 57 is viewed from the tip end side (spray plate 42) of the mixing chamber 54. It is desirable to have a size that covers at least 1/2 minute.

  Here, the effect | action of the combustion burner 21 (burner chip | tip 41) of Example 1 mentioned above is demonstrated in detail. In FIG. 1, the fuel flow is represented by black arrows, the steam flow is represented by white arrows, and the mixed fluid in which fuel and steam are mixed is represented by hatched arrows.

  When fuel is supplied to the burner chip 41 through the fuel supply pipe 22, this fuel is supplied to the mixing chamber 54 through the plurality of fuel supply passages 57. When steam is supplied to the burner tip 41 through the steam supply pipe 25, this steam is supplied from the outer peripheral side to the mixing chamber 54 through the plurality of steam supply passages 58, the ejection chamber 55, and the communication passage 56.

  Then, in the mixing chamber 54, the fuel supplied from each fuel supply passage 57 and the steam supplied from each steam supply passage 58 collide and mix. That is, the fuel supplied to the mixing chamber 54 along the longitudinal direction is diffused and mixed by the vapor supplied to the mixing chamber 54 along the radial direction from the outer peripheral side.

  Further, the fuel supplied to the mixing chamber 54 is collected at the center by the vapor supplied to the mixing chamber 54 from the outer peripheral side, and collides with the guide surface 63 of the guide member 61. Then, the fuel and the vapor temporarily stay in the space defined by the guide surface 63 and the second recess 53 by the guide surface 63. That is, the space defined by the guide surface 63 and the second recess 53 becomes a premixing chamber, and the fuel and the steam are mixed while being diffused when staying in the premixing chamber.

  Then, the mixed fluid mixed efficiently by the guide surface 63 flows forward from the gap between the guide member 61 and the inner wall surface of the mixing chamber 54. Therefore, the mixed fluid in which the fuel and the steam are efficiently mixed is ejected (sprayed) from the mixing chamber 54 through the mixed fluid ejection holes 52 to the outside.

  Thus, in the burner tip of Example 1, the mixing chamber 54 provided inside, the plurality of mixed fluid ejection holes 52 formed at the tip, and the base end side are provided along the longitudinal direction. A plurality of fuel supply passages 57 that supply fuel to the mixing chamber 54, a steam supply passage 58 that is provided outside the fuel supply passage 57 and supplies steam to the mixing chamber 54 from the outside, and a fuel supply passage in the mixing chamber 54 57 and a guide member 61 disposed in front of the steam supply passage 58.

  Accordingly, the fuel supplied from the fuel supply passage 57 to the mixing chamber 54 and the steam supplied from the vapor supply passage 58 to the mixing chamber 54 are diffused by colliding with the guide member 61. Mixing is performed efficiently, and the combustibility can be improved by promoting the mixing of fuel and steam in the mixing chamber 54.

  In the burner tip of the first embodiment, the guide surface 63 of the guide member 61 is disposed closer to the base end side of the mixing chamber 54 than the intermediate position in the entire length of the mixing chamber 54. Accordingly, since the guide surface is disposed close to the second recess 53 side, the fuel flow and the steam flow collide with the guide surface 63 with a large amount of energy at an early stage. It is possible to promote the diffusion of the fuel and steam and to mix them efficiently.

  In the burner tip according to the first embodiment, the guide member 61 is disposed to face the supply port of the fuel supply passage 57. Therefore, the fuel can be diffused by appropriately colliding with the guide member 61, and can be efficiently mixed with the vapor in the mixing chamber 54.

  In the burner tip of the first embodiment, the guide member 61 is supported by the support rod 62 extending from the spray plate 42 side. Therefore, since the support rod 62 is positioned on the opposite side of the guide surface 63, the mixing promotion of the fuel and the steam by the guide member 61 is not adversely affected and the fuel and the steam are efficiently mixed in the mixing chamber 54. Can do.

  In the combustion burner of the first embodiment, since the burner tip 41 described above is provided at the tip of the fuel supply pipe 22 and the steam supply pipe 25, the fuel and the steam are efficiently mixed in the mixing chamber 54. It is possible to improve the combustibility by promoting the mixing of fuel and steam in the mixing chamber 54.

  In the boiler according to the first embodiment, the fuel and air are burned in the hollow furnace 11 and heat is exchanged in the furnace 11 to recover the heat. Since the combustion burner 21 is arranged, the combustibility can be improved by promoting the mixing of fuel and steam in the mixing chamber 54.

  FIG. 5 is a front view of a guide member mounted on the combustion burner according to the second embodiment of the present invention, and FIG. 6 is a sectional view taken along line VI-VI in FIG. The basic configuration of the combustion burner of the second embodiment is substantially the same as that of the first embodiment described above, and will be described with reference to FIG. 1 and a member having the same function as the first embodiment described above. Are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 1, the combustion burner 21 has a fuel supply pipe 22, a steam supply pipe 25, and a burner tip 41. The burner chip 41 includes a spray plate 42 and a back plate 43. The spray plate 42 is formed with a first recess 51 at the base end and a plurality of mixed fluid ejection holes 52 at the tip. The back plate 43 has a second recess 53 formed at the tip, and the first recess 51 and the second recess 53 constitute a mixing chamber 54.

  In the back plate 43, an ejection chamber 55 is formed on the outer peripheral side of the second recess 53, and the ejection chamber 55 communicates with the second recess 53 via a plurality of communication paths 56. Further, the back plate 43 is connected to the fuel supply pipe 22 and the steam supply pipe 25 at the base end portion, and is provided with a plurality of fuel supply passages 57 for supplying fuel from the fuel supply path 22a to the mixing chamber 54, and for supplying steam. A plurality of steam supply passages 58 are provided from the steam supply path 25a to the mixing chamber 54 from the outer peripheral side.

  As shown in FIGS. 1, 5, and 6, the burner tip 41 has a guide member 71 (61) on the front side (mixed fluid ejection hole 52 side) of the fuel supply passage 57 and the steam supply passage 58 in the mixing chamber 54. ) Is arranged. The guide member 71 (61) has a guide surface facing the supply port side of the fuel supply passage 57.

  In the second embodiment, the guide member 71 includes a guide surface provided with a turning force applying mechanism that applies a turning force about an axis along the longitudinal direction to the fuel supplied from the fuel supply passage 57. In this turning force applying mechanism, the guide surface of the guide member 71 is provided with a plurality of step portions 72 (eight in the second embodiment) along the radial direction (radial direction) at equal intervals in the circumferential direction. A curved surface 73 whose height (thickness) changes in the circumferential direction between 72 is formed. The curved surface 73 has a surface position that changes away from the fuel supply passage 57 in the counterclockwise direction in FIG. 5, and may be a linear inclined surface.

  Therefore, when the fuel is supplied to the mixing chamber 54 through the plurality of fuel supply passages 57 and the steam is supplied from the outer peripheral side to the mixing chamber 54 through the plurality of steam supply passages 58, the ejection chamber 55, and the communication passage 56, the fuel is vaporized. It is collected in the central part while mixing with and collides with the guide surface of the guide member 71. Then, the turning force is applied to the fuel and the steam by the turning force applying mechanism. That is, the fuel and the steam are guided to the respective curved surfaces 73, swirled counterclockwise in FIG. 5, and mixed while being diffused by colliding with the stepped portions 72.

  Thus, in the burner tip according to the second embodiment, the curved surface 73 is provided on the guide surface of the guide member 71 as a turning force applying mechanism for applying a turning force to the fuel supplied from the fuel supply passage 57.

  Therefore, the fuel supplied from the fuel supply passage 57 to the mixing chamber 54 is collected in the center by the steam, swirled by being guided to each curved surface 73, and mixed while diffusing by colliding with each stepped portion 72. As a result, fuel and steam can be efficiently mixed in the mixing chamber 54.

  FIG. 7 is a front view of a guide member attached to the combustion burner according to the third embodiment of the present invention. The basic configuration of the combustion burner of the third embodiment is substantially the same as that of the first embodiment described above, and will be described with reference to FIG. 1 and a member having the same function as that of the first embodiment described above. Are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 1 and 7, the burner tip 41 has a guide member 81 (61) disposed on the front side (mixed fluid ejection hole 52 side) of the fuel supply passage 57 and the vapor supply passage 58 in the mixing chamber 54. Yes. The guide member 81 (61) has a guide surface facing the supply port side of the fuel supply passage 57.

  In the third embodiment, the guide member 81 is provided with a turning force imparting mechanism that imparts a turning force around the axis along the longitudinal direction to the fuel supplied from the fuel supply passage 57 on the guide surface. In this turning force applying mechanism, the guide surface of the guide member 81 has a plurality of vertical wall portions 82 that are along the radial direction (radial direction) and curved in the circumferential direction at equal intervals in the circumferential direction (eight in the third embodiment). In addition to being provided, an inclined surface 83 whose height (thickness) changes in the circumferential direction and the radial direction is formed between the vertical wall portions 82. The vertical wall portion 82 is formed in a spiral shape in the counterclockwise direction in FIG. In addition, the surface position of the inclined surface 83 changes so as to move away from the fuel supply passage 57 in the clockwise direction in FIG. 7, and the surface position of the inclined surface 83 moves away from the fuel supply passage 57 toward the outer side in the radial direction. It will change.

  Therefore, when the fuel is supplied to the mixing chamber 54 through the plurality of fuel supply passages 57 and the steam is supplied from the outer peripheral side to the mixing chamber 54 through the plurality of steam supply passages 58, the ejection chamber 55, and the communication passage 56, the fuel is vaporized. It is collected in the central part while mixing with and collides with the guide surface of the guide member 81. Then, the turning force is applied to the fuel and the steam by the turning force applying mechanism. That is, the fuel and the steam are guided to the inclined surfaces 83 so that they are swung in the clockwise direction in FIG. 7 and guided to the vertical wall portions 82, and then radially outward by the vertical wall portions 82. By being guided, it is mixed while being diffused by turning counterclockwise in FIG.

  As described above, in the burner tip according to the third embodiment, the vertical wall portion 82 and the inclined surface 83 as a turning force applying mechanism for applying a turning force to the fuel supplied from the fuel supply passage 57 to the guide surface of the guide member 81. Is provided.

  Therefore, the fuel supplied from the fuel supply passage 57 to the mixing chamber 54 is collected in the central portion by the steam, and is swirled by being guided to the inclined surfaces 83 and the vertical wall portions 82 and mixed while being diffused. Thus, fuel and steam can be mixed efficiently in the mixing chamber 54.

  FIG. 8 is a cross-sectional view of a combustion burner having a burner tip according to a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  As shown in FIG. 8, the combustion burner 21 has a fuel supply pipe 22, a steam supply pipe 25, and a burner tip 41. The burner chip 41 includes a spray plate 42 and a back plate 43. The spray plate 42 is formed with a first recess 51 at the base end and a plurality of mixed fluid ejection holes 52 at the tip. The back plate 43 has a second recess 53 formed at the tip, and the first recess 51 and the second recess 53 constitute a mixing chamber 54.

  In the back plate 43, an ejection chamber 55 is formed on the outer peripheral side of the second recess 53, and the ejection chamber 55 communicates with the second recess 53 via a plurality of communication paths 56. Further, the back plate 43 is connected to the fuel supply pipe 22 and the steam supply pipe 25 at the base end portion, and is provided with a plurality of fuel supply passages 57 for supplying fuel from the fuel supply path 22a to the mixing chamber 54, and for supplying steam. A plurality of steam supply passages 58 that are supplied from the outer peripheral side to the mixing chamber 54 from the steam supply path 25a are provided.

  In the burner tip 41, a guide member 91 is disposed on the front side (mixed fluid ejection hole 52 side) of the fuel supply passage 57 and the vapor supply passage 58 in the mixing chamber 54. The guide member 91 is supported by a support rod (support member) 92 extending forward from the front end side of the back plate 43 constituting the burner chip 41. The guide member 91 has a guide surface 93 that faces the supply port side of the fuel supply passage 57.

  Therefore, when the fuel is supplied to the mixing chamber 54 through the plurality of fuel supply passages 57 and the steam is supplied from the outer peripheral side to the mixing chamber 54 through the plurality of steam supply passages 58, the ejection chamber 55, and the communication passage 56, the fuel is vaporized. It is collected in the central part while mixing with and collides with the guide surface 93 of the guide member 91. Then, the fuel and the vapor temporarily stay in the space defined by the guide surface 93 and the second recess 53 by the guide surface 93. That is, the space defined by the guide surface 93 and the second recess 53 becomes a premixing chamber, and when the fuel and the vapor stay in the premixing chamber, they are mixed while being diffused.

  Then, the mixed fluid efficiently mixed by the guide surface 93 flows forward from the gap between the guide member 91 and the inner wall surface of the mixing chamber 54. Therefore, the mixed fluid in which the fuel and the steam are efficiently mixed is ejected (sprayed) from the mixing chamber 54 through the mixed fluid ejection holes 52 to the outside.

  As described above, in the burner tip according to the fourth embodiment, the burner tip 41 is constituted by the spray plate 42 and the back plate 43, and the guide member is provided in front of the fuel supply passage 57 and the steam supply passage 58 in the mixing chamber 54. 91 is disposed, and this guide member 91 is supported by a support rod 92 extending from the back plate 43.

  Therefore, the structure of the burner chip 41 can be simplified by dividing the burner chip 41 into the spray plate 42 and the back plate 43, and the guide member 91 is provided on the back plate 43 by the support rod 92. Thus, the guide member 91 can be easily arranged on the burner tip 41, and the structure of the spray plate 42 can be simplified for the burner tip 41, and the cost can be reduced.

  FIG. 9 is a cross-sectional view of a combustion burner having a burner tip according to a fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  As shown in FIG. 9, the combustion burner 21 has a fuel supply pipe 22, a steam supply pipe 25, and a burner tip 41. The burner chip 41 includes a spray plate 42 and a back plate 43. The spray plate 42 is formed with a first recess 51 at the base end and a plurality of mixed fluid ejection holes 52 at the tip. The back plate 43 has a second recess 53 formed at the tip, and the first recess 51 and the second recess 53 constitute a mixing chamber 54.

  In the back plate 43, an ejection chamber 55 is formed on the outer peripheral side of the second recess 53, and the ejection chamber 55 communicates with the second recess 53 via a plurality of communication paths 56. Further, the back plate 43 is connected to the fuel supply pipe 22 and the steam supply pipe 25 at the base end portion, and is provided with a plurality of fuel supply passages 57 for supplying fuel from the fuel supply path 22a to the mixing chamber 54, and for supplying steam. A plurality of steam supply passages 58 that are supplied from the outer peripheral side to the mixing chamber 54 from the steam supply path 25a are provided.

  In the burner tip 41, the guide member 101 is arranged on the front side (mixed fluid ejection hole 52 side) of the fuel supply passage 57 and the steam supply passage 58 in the mixing chamber 54. The guide member 101 is supported by a support rod (support member) 102 extending rearward from the tip end side of the spray plate 42 constituting the burner chip 41. This guide member 101 has a disc shape and has a guide surface 103 facing the supply port side of the fuel supply passage 57.

  The guide surface 103 of the guide member 101 has a concave curved shape. That is, the guide surface 103 has a circular shape, and has a concave spherical shape in which the central portion is farthest from the supply port of the fuel supply passage 57 and approaches the outer peripheral portion.

  In this embodiment, the guide member 101 has a spherical shape with the concave guide surface 103. However, the present invention is not limited to this shape. For example, it is good also as a recessed part shape where the guide surface in the guide member was simply recessed.

  Therefore, when the fuel is supplied to the mixing chamber 54 through the plurality of fuel supply passages 57 and the steam is supplied from the outer peripheral side to the mixing chamber 54 through the plurality of steam supply passages 58, the ejection chamber 55, and the communication passage 56, the fuel is vaporized. It is collected in the central part while mixing with and collides with the guide surface 103 of the guide member 101. Then, the fuel and the vapor temporarily stay in the space defined by the guide surface 103 and the second recess 53 by the guide surface 103. That is, the space defined by the guide surface 103 and the second recess 53 becomes a premixing chamber, and the fuel and the steam are mixed while being diffused when staying in the premixing chamber.

  Further, since the guide surface 103 has a concave spherical shape, the fuel and vapor supplied to the mixing chamber 54 are temporarily retained by swirling along the guide surface 103, and mixing is performed. Fuel and steam are efficiently mixed in the chamber 54.

  Then, the mixed fluid mixed efficiently by the guide surface 103 flows forward through the gap between the guide member 101 and the inner wall surface of the mixing chamber 54. Therefore, the mixed fluid in which the fuel and the steam are efficiently mixed is ejected (sprayed) from the mixing chamber 54 through the mixed fluid ejection holes 52 to the outside.

  As described above, in the burner tip according to the fifth embodiment, the guide member 101 is disposed in front of the fuel supply passage 57 and the steam supply passage 58 in the mixing chamber 54, and the guide surface 103 of the guide member 101 has a concave curved shape. It is said.

  Therefore, the fuel and steam supplied to the mixing chamber 54 are temporarily retained by swirling along the guide surface 103, so that the fuel and the steam can be efficiently mixed in the mixing chamber 54.

  In the above-described embodiment, the guide surfaces 63, 93, 103 of the guide members 61, 71, 81, 91, 101 are set to the base end side (back plate 43) of the mixing chamber 54 with respect to the total length L of the mixing chamber 54. However, it may be disposed anywhere as long as the fuel supplied from the fuel supply passage 57 can collide.

  In the above-described embodiment, the guide surfaces 63, 93, and 103 are disposed so as to face the supply port of the fuel supply passage 57, and the fuel supply passage 57 is viewed from the front end side (spray plate 42) of the mixing chamber 54. However, it may be disposed anywhere as long as the fuel supplied from the fuel supply passage 57 can collide. That is, when viewed from the front end side (spray plate 42) of the mixing chamber 54, the opening area of the supply port of the fuel supply passage 57 may be entirely covered, or the opening area of the supply port of the fuel supply passage 57. The size may not cover at all. That is, the fuel supplied from the fuel supply passage 57 to the mixing chamber 54 is fed into the central portion of the mixing chamber 54 by the steam supplied from the outer peripheral side to the mixing chamber 54 through the steam supply passage 58, the ejection chamber 55, and the communication passage 56. Since the fuel is collected, the guide surface may not completely face the supply port of the fuel supply passage 57.

  In the above-described embodiment, the guide members 61, 71, 81, 101 are supported on the tip of the spray plate 42 by the support rods 62, 102, or the guide member 91 is supported on the back plate 43 by the support rod 92. However, it is not limited to this support structure. For example, the guide member may be supported on the inner wall surface of the spray plate 42 by the support member.

DESCRIPTION OF SYMBOLS 10 Oil-fired boiler 11 Furnace 21 Combustion burner 22 Fuel supply piping 25 Steam supply piping 41 Burner tip 42 Spray plate (chip main body)
43 Back plate (chip body)
51 1st recessed part 52 Mixed fluid ejection hole 53 2nd recessed part 54 Mixing chamber 55 Injection chamber 56 Communication path 57 Fuel supply path (fluid fuel supply path)
58 Steam supply passage (spray medium supply passage)
61, 71, 81, 91, 101 Guide member 62, 92, 102 Support rod (support member)
63, 93, 103 Guide surface

Claims (10)

A chip body;
A mixing chamber provided inside the chip body;
A plurality of mixed fluid ejection holes whose base end portion communicates with the mixing chamber and whose distal end portion opens at the distal end of the chip body and is arranged at predetermined intervals in the circumferential direction of the chip body;
A plurality of fluid fuel supply passages provided along the longitudinal direction on the base end side of the chip body to supply fluid fuel to the mixing chamber;
A spray medium supply passage which is provided outside the fluid fuel supply passage in the chip body and supplies the spray medium to the mixing chamber from the outside;
A guide member disposed in front of the fluid fuel supply passage and the spray medium supply passage in the mixing chamber;
A burner tip characterized by comprising:   2. The burner tip according to claim 1, wherein a guide surface of the guide member is disposed closer to a base end side of the mixing chamber than an intermediate position in the entire length of the mixing chamber.   3. The burner tip according to claim 1, wherein the guide member is disposed to face a supply port of the fluid fuel supply passage.   2. The guide member is provided with a turning force applying mechanism for applying a turning force about an axis along a longitudinal direction of the tip body to the fluid fuel supplied from the fluid fuel supply passage. The burner chip according to any one of items 1 to 3.   The burner tip according to any one of claims 1 to 4, wherein the guide surface of the guide member has a concave shape.   The burner tip according to any one of claims 1 to 5, wherein the guide surface of the guide member has a concave curved shape.   The burner tip according to any one of claims 1 to 6, wherein the guide member is supported by a support member extending from a tip end side of the tip body.   The chip body is configured by connecting a spray plate in which a mixed fluid ejection hole is provided and a back plate in which the fluid fuel supply passage and the spray medium supply passage are provided, and the mixing is performed by the spray plate and the back plate. The burner tip according to any one of claims 1 to 6, wherein a chamber is defined and the guide member is supported by a support member extending from a back plate. A fluid fuel supply pipe capable of supplying fluid fuel;
A spray medium supply pipe capable of supplying the spray medium;
A chip body provided at a tip portion of the fluid fuel supply pipe and the spray medium supply pipe;
A mixing chamber provided inside the chip body;
A plurality of mixed fluid ejection holes whose base end portion communicates with the mixing chamber and whose distal end portion opens at the distal end of the chip body and is arranged at predetermined intervals in the circumferential direction of the chip body;
A plurality of fluid fuel supply passages provided along the longitudinal direction on the base end side of the chip body to supply fluid fuel of the fluid fuel supply pipe to the mixing chamber;
A spray medium supply passage which is provided outside the fluid fuel supply passage in the chip body and supplies the spray medium to the mixing chamber from the outside;
A guide member disposed in front of the fluid fuel supply passage and the spray medium supply passage in the mixing chamber;
A combustion burner characterized by comprising: In a boiler that burns fuel and air in a hollow furnace and collects heat by exchanging heat in the furnace,
A boiler characterized in that the combustion burner according to claim 9 is arranged on the furnace wall.

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