WO2020230578A1 - 固体燃料バーナ、ボイラ装置、固体燃料バーナのノズルユニット、およびガイドベーンユニット - Google Patents
固体燃料バーナ、ボイラ装置、固体燃料バーナのノズルユニット、およびガイドベーンユニット Download PDFInfo
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- WO2020230578A1 WO2020230578A1 PCT/JP2020/017527 JP2020017527W WO2020230578A1 WO 2020230578 A1 WO2020230578 A1 WO 2020230578A1 JP 2020017527 W JP2020017527 W JP 2020017527W WO 2020230578 A1 WO2020230578 A1 WO 2020230578A1
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- WIPO (PCT)
- Prior art keywords
- solid fuel
- air
- fuel burner
- nozzle
- seal
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- 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
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/10—Nozzle tips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/20—Fuel flow guiding devices
Definitions
- the present invention relates to a solid fuel burner that burns solid fuel such as pulverized coal and biomass, a boiler device equipped with this solid fuel burner, a nozzle unit of the solid fuel burner, and a guide vane unit attached to the solid fuel burner.
- Patent Document 1 states that "a secondary air nozzle for ejecting secondary air is concentrically provided on the outside of a pulverized coal nozzle for ejecting a mixture of pulverized coal and primary air.
- a pulverized coal combustion burner in which a tertiary air nozzle for ejecting tertiary air is concentrically provided on the outside of the secondary air nozzle, and a pipe expansion portion is provided at the tip of a partition wall separating the secondary air flow path and the tertiary air flow path.
- an obstacle having a plane substantially perpendicular to the flow of the primary air and a guide plate having a plane substantially perpendicular to the flow of the secondary air are provided at the tip of the partition partition separating the pulverized coal nozzle and the secondary air nozzle.
- the plane of the obstacle is located upstream of the plane of the guide plate in the axial direction of the pulverized coal nozzle, and the plane of the guide plate is in the axial direction of the pulverized coal nozzle from the tip of the pipe expansion portion. It is provided so as to project to the downstream side.
- Patent Document 1 by deflecting the flow of the secondary air outward in the radial direction by the guide plate, the reducing flame region having a low oxygen concentration formed by the primary air can be enlarged. As a result, the generation of NOx is suppressed.
- An object of the present invention is to provide a solid fuel burner, a boiler device, a nozzle unit of a solid fuel burner, and a guide vane unit capable of reducing unburned components and CO while suppressing the generation of NOx.
- a typical invention is a solid fuel burner inserted into a burner throat drilled in a wall of a furnace, and a solid that ejects a mixed fluid of solid fuel and primary air.
- a tertiary air nozzle that ejects tertiary air, a secondary air guide member that is located on the outer periphery of the tip of the solid fuel nozzle and guides the flow of secondary air outward in the radial direction, and the tertiary air.
- the tip position of the tertiary air guide member in the axial direction of the solid fuel burner is on the furnace side from the tip position of the secondary air guide member, and the inner peripheral surface of the burner throat is the center.
- the diameter is expanded from the burner side to the furnace side of the wall portion of the furnace so as to be inclined at a second angle with respect to the axis, and the first angle is 10 degrees to the central axis.
- the second angle is larger than the first angle, and a part of the tertiary air is used as sealing air between the tertiary air guide member and the burner throat.
- a seal air introduction member to be introduced is provided, and the seal air introduction member is inclined outward in the radial direction at a third angle with respect to the central axis, and the seal is attached to the tip of the seal air introduction member. It is characterized in that a seal air deflection member for deflecting air outward in the radial direction is provided.
- unburned components and CO can be reduced while suppressing the generation of NOx. Issues, configurations, and effects other than those described above will be clarified by the following description of the embodiments.
- FIG. 5 is a schematic view of a solid fuel burner having two guide sleeves according to a modification of the first embodiment of the present invention. It is the schematic of the solid fuel burner which concerns on 2nd Embodiment of this invention.
- FIG. 1 It is a figure which shows the air flow of the nozzle tip of the solid fuel burner which concerns on 2nd Embodiment of this invention. It is a figure which shows the air flow in the nozzle tip region of the solid fuel burner which does not provide a seal air introduction plate. It is the schematic of the solid fuel burner which concerns on 3rd Embodiment of this invention. It is the schematic of the solid fuel burner which concerns on 4th Embodiment of this invention. It is a figure which shows the air flow of the nozzle tip of the solid fuel burner which concerns on 4th Embodiment of this invention. It is the schematic of the solid fuel burner which concerns on 5th Embodiment of this invention. FIG.
- FIG. 5 is a schematic view of a solid fuel burner having two guide sleeves according to a modification of the second to fifth embodiments of the present invention. It is sectional drawing of the main part of the solid fuel burner shown in FIG. It is the schematic of the solid fuel burner which concerns on 6th Embodiment of this invention. It is the schematic of the solid fuel burner which concerns on 7th Embodiment of this invention. It is an enlarged view of the D1 part shown in FIG. It is a figure which shows the state which the nozzle tip portion of the solid fuel burner which concerns on 7th Embodiment of this invention is pulled out. It is a figure which shows the air flow of the nozzle tip region of the solid fuel burner which concerns on 7th Embodiment of this invention. It is a figure which shows the modification of the compression flow forming member.
- FIG. 1 is a side view showing the overall configuration of the boiler device according to the embodiment of the present invention.
- the boiler device 1 according to the present embodiment includes a fireplace 2, a cage portion (rear heat transfer portion) 3, and an auxiliary side wall 4 connecting the fireplace 2 and the cage portion 3.
- the solid fuel burners 5-1 according to the first embodiment described below are arranged to face each other in multiple stages.
- the solid fuel ejected from each solid fuel burner 5-1 is burned in the furnace 2, flows through the sub-side wall 4 and the cage portion 3 in order as combustion exhaust gas, and then is discharged to the atmosphere through an exhaust gas treatment device (not shown).
- an exhaust gas treatment device not shown
- the solid fuel burner according to another embodiment described in this specification can be applied to the boiler device 1 shown in FIG.
- the boiler device 1 shown in FIG. 1 is a single-stage combustion type that does not have an opening (after-airport) for supplying only air to the upper part of the solid fuel burner 5-1 in the furnace 2, but has an after-airport. It may be a two-stage combustion type.
- FIG. 2 is a schematic view of the solid fuel burner 5-1 according to the first embodiment
- FIG. 3 is an enlarged view of a portion D shown in FIG.
- the solid fuel burner 5-1 is inserted in the horizontal direction with respect to the burner throat 28 whose nozzle tip (burner outlet side) is bored in the water wall 19 which is the wall portion of the furnace 2. In this way, it is attached to the water wall 19 of the fireplace 2.
- the burner throat 28 is from the burner 5-1 side (outside of the water wall 19) to the furnace 2 side (outside the water wall 19) of the water wall 19 so that the inner peripheral surface thereof is inclined at a second angle ⁇ 2 with respect to the burner central axis C. It is an opening formed by expanding the diameter toward the inside of the water wall 19).
- the solid fuel burner 5-1 has a fuel nozzle (solid fuel nozzle) 10.
- the fuel nozzle 10 is a tubular member whose base side is connected to a fuel-containing fluid pipe (not shown), and a solid-air two-phase flow (mixed fluid 13) of solid fuel and primary air (conveyed gas) is inside the fuel nozzle 10. It becomes a flowing primary air flow path 10a.
- the solid fuel may be a solid or powder such as coal (pulverized coal) or biomass, or a mixture thereof, and in the present embodiment, an example in which pulverized coal is used as the solid fuel is shown.
- the mixed fluid 13 may be referred to as the primary air 13.
- a secondary air nozzle 11 having a secondary air flow path 11a through which the secondary air 14 flows is provided on the outside (outer circumference side) of the fuel nozzle 10, and a tertiary air nozzle 11 is provided on the outside (outer circumference side) of the secondary air nozzle 11.
- a tertiary air nozzle 12 having a tertiary air flow path 12a through which the air 15 flows is provided.
- the secondary air 14 and the tertiary air 15 are combustion gases, and air is usually used in the same manner as the primary air which is a transport gas, but with combustion exhaust gas, oxygen-rich gas, or these gases and air. A mixed gas of two or more can also be applied.
- the annular secondary air nozzle 11 is concentric with the fuel nozzle 10 as the center.
- the annular tertiary air nozzles 12 are arranged concentrically on the outside of the secondary air nozzles 11.
- the swirler 22 for imparting swirl to the tertiary air 15 is arranged at the inlet portion of the tertiary air flow path 12a, but it is also possible to configure the swirler 22 not to be provided. ..
- a start burner (oil gun) 16 penetrating the fuel nozzle 10 is provided, and is used for preheating and assisting combustion when the boiler is started or when the boiler load is low. Depending on the configuration of the solid fuel burner 5-1, the start burner 16 may not be installed.
- a flame holder for forming a circulating flow 51 (see FIG. 4A) between the spouts of the primary air 13 and the secondary air 14 at the open end of the fuel nozzle 10 (that is, the outlet on the furnace 2 side). 23 is provided.
- the flame retainer 23 is provided on the outer periphery of the tip of the fuel nozzle 10 so as to form a circulating flow 51 on the downstream side of the flame retainer 23 to enhance ignitability and flame retention effect.
- the start-up burner 16, the fuel nozzle 10, the secondary air nozzle 11, and the tertiary air nozzle 12 each eject ejecta toward the inside of the furnace 2. Further, the starting burner 16, the fuel nozzle 10, the secondary air nozzle 11, and the tertiary air nozzle 12 are arranged in a wind box 25 surrounding the burner throat 28. Combustion air is supplied through the windbox 25.
- the partition wall 18 is a wall-shaped member that separates the internal space of the windbox 25 from the outside of the furnace 26.
- a guide sleeve 20 (in a divergent shape) that expands in the radial direction with respect to the burner central axis C is provided.
- the guide sleeve (tertiary air guide member) 20 is inclined outward in the radial direction at a first angle ⁇ 1 with respect to the burner central axis C.
- the first angle ⁇ 1 is substantially the same as the second angle ⁇ 2, which is the inclination angle of the inner peripheral surface of the burner throat 28 described above, and is set within the range of 10 degrees to 40 degrees. More preferably, the first angle ⁇ 1 and the second angle ⁇ 2 are in the range of 20 to 30 degrees.
- the secondary air 14 and the tertiary air 15 flow too much outward in the radial direction, so that the reducing flame region due to the primary air 13 becomes too large. , The effect of reducing unburned matter and CO, which are the residues of solid fuel, cannot be expected so much. Further, when the first angle ⁇ 1 and the second angle ⁇ 2 are less than 10 degrees, the reducing flame region becomes small, so that the effect of reducing NOx cannot be expected so much.
- the first angle ⁇ 1 and the second angle ⁇ 2 are preferably in the range of 10 to 40 degrees, and when set in the range of 20 to 30 degrees, the effect of reducing unburned content and CO of solid fuel and NOx It is more preferable because the reduction effect of the above can be balanced.
- the guide sleeve 20 may be located on the outer peripheral side of the secondary air nozzle 11 and at the tip of the tertiary air nozzle 12, regardless of where the guide sleeve 20 is attached.
- the guide sleeve 20 may be fixed to the tip of the outer peripheral outlet of the secondary air nozzle 11, or directly to the burner throat 28 with the guide sleeve 20 positioned at the tip of the outer peripheral outlet of the secondary air nozzle 11. It may be fixed indirectly.
- a ring-shaped guide ring (secondary air guide member) 34 extending outward in the radial direction is arranged on the outer peripheral portion of the tip of the flame holder 23.
- the guide ring 34 has a substantially vertical plane substantially orthogonal to the burner central axis C.
- the guide sleeve 20 overlaps the guide ring 34 in the direction (axial direction) along the central axis C of the burner, and the tip position X2 of the guide sleeve 20 is more than the tip position X1 of the guide ring 34.
- the one is on the fireplace 2 side (right side in FIG. 3).
- the tip position X2 is on the downstream side of the air flow than the tip position X1.
- the distance between the front side surface of the guide ring 34 (the side surface of the guide ring 34 facing the fireplace 2 and the side surface opposite to the side surface facing the furnace 2) and the tip of the inner peripheral surface of the guide sleeve 20, that is, the guide sleeve 20 guides.
- A be the length that overlaps the ring 34, and set the distance between the tip of the inner peripheral surface of the guide sleeve 20 and the outer peripheral end of the guide ring 34, that is, the gap between the guide sleeve 20 and the guide ring 34 in the height direction.
- B the relationship between the length A and the gap B is set so as to satisfy A> 0.5 ⁇ B.
- the tip position X2 of the guide sleeve 20 and the tip position X1 of the guide ring 34 are housed in the burner throat 28 and do not project from the inner peripheral surface of the water wall 19 toward the inside of the fireplace 2.
- FIG. 4B is a diagram showing an air flow in the nozzle tip region of a conventional solid fuel burner.
- the tip position X1 of the guide ring 34 is closer to the fireplace 2 than the tip position X2 of the guide sleeve 20. That is, the positional relationship is opposite to that of the first embodiment, and the guide sleeve 20 does not overlap the guide ring 34.
- the first angle ⁇ 1 of the guide sleeve 20 is set to be the same as the first angle ⁇ 1 of the first embodiment.
- the secondary air 14 collides with the guide ring 34 and largely turns outward in the radial direction.
- the guide sleeve 20 does not overlap the guide ring 34, the secondary air 14 flows largely outward in the radial direction together with the tertiary air 15.
- the reducing flame region 50b becomes large, and although the effect of reducing NOx can be expected, the effect of reducing the unburned content and CO of the solid fuel is low.
- FIG. 4A is a diagram showing an air flow in the nozzle tip region of the solid fuel burner 5-1.
- the primary air 13 is ejected from the fuel nozzle 10 into the furnace 2.
- the secondary air 14 flows in the secondary air nozzle 11 and collides with the guide ring 34 of the flame holder 23, and the flow direction is deflected outward in the radial direction.
- the secondary air 14 that collides with the guide ring 34 exceeds the guide ring 34 of the guide sleeve 20. It flows along the inner peripheral surface of the wrapping portion (part A in FIG. 3) and is ejected into the fireplace 2 toward the outside in the radial direction at a first angle ⁇ 1 with respect to the central axis C of the burner.
- the tertiary air 15 flows through the tertiary air nozzle 12, and while turning toward the outer peripheral side along the guide sleeve 20, inside the furnace 2 toward the outside in the radial direction at a first angle ⁇ 1 with respect to the burner central axis C. Squirt into.
- the tip position X2 of the guide sleeve 20 is closer to the fireplace 2 than the tip position X1 of the guide ring 34, the radial outward deflection of the secondary air 14 is suppressed by the guide sleeve 20.
- the first angle ⁇ 1 of the guide sleeve 20 is set to 10 to 40 degrees. Therefore, the secondary air 14 and the tertiary air 15 are deflected radially outward by the first angle ⁇ 1 of the guide sleeve 20 and are ejected into the fireplace 2.
- the reducing flame region 50a can be narrowed as compared with the above-mentioned conventional technique, and the generation of unburned components and CO of the solid fuel can be reduced.
- the guide sleeve 20 is configured to overlap the guide ring 34, the secondary air 14 and the tertiary air 15 are in the radial direction. The flow to the outside can be suppressed. As a result, the reduction flame region 50a due to the primary air 13 becomes smaller than before, and the generation of unburned components and CO of the solid fuel can be reduced.
- the first angle ⁇ 1 of the guide sleeve 20 in the range of 10 to 40 degrees, more preferably in the range of 20 to 30 degrees, the effect of reducing the unburned content and CO of the solid fuel and NOx It is possible to balance the reduction effect of.
- the relationship between the length A in which the guide sleeve 20 overlaps the guide ring 34 and the gap B in the height direction between the guide sleeve 20 and the guide ring 34 satisfies A> 0.5 ⁇ B. Since it is set, the secondary air 14 can flow along the guide sleeve 20 while the guide sleeve 20 surely suppresses the secondary air 14 from going outward in the radial direction. Therefore, a suitable reducing flame region 50a can be formed, and the generation of unburned components and CO of the solid fuel can be effectively suppressed.
- the solid fuel ejected from the fuel nozzle 10 and the secondary air 14 and the tertiary air 15 are mixed faster.
- the gas temperature at the outlet of the fireplace 2 can be lowered, and it is also effective in suppressing slugging.
- slugging means that the ash melted by combustion adheres to the furnace wall and the heat transfer tube to reduce the heat collection and increase the pressure loss in the furnace.
- FIG. 5 is a schematic view of the solid fuel burner 5-2 of this example.
- the same components as those in the case of one guide sleeve 20 are designated by the same reference numerals, and the description thereof will be omitted.
- a plurality (for example, two) of guide sleeves 20 (20a, 20b) are provided at intervals in the radial direction of the tertiary air nozzle 12.
- the two guide sleeves 20a and 20b are held at predetermined intervals by spacers (not shown), and are also fixed by bolts or welds (not shown).
- the first angles ⁇ 1 of the two guide sleeves 20a and 20b are both substantially the same, for example, in the range of 10 to 40 degrees, and more preferably in the range of 20 to 30 degrees.
- the tip positions X2 of the two guide sleeves 20a and 20b in the axial direction are both substantially the same position, and are closer to the fireplace 2 than the tip position X1 of the guide ring 34.
- the upstream side of the tertiary air nozzle 12 of the two guide sleeves 20a and 20b is a cylindrical portion substantially parallel to the nozzle axial direction, that is, having a substantially constant diameter, and on the downstream side, to the expanded tubular portion having the above-mentioned first angle ⁇ 1. It is in a form that switches to.
- the tertiary air 15 is guided outward in the radial direction by a first angle ⁇ 1 by the plurality of guide sleeves 20, so that, for example, the radial width of the outlet portion of the tertiary air nozzle 12 (That is, when the distance between the tip of the partition partition separating the secondary air flow path 11a and the tertiary air flow path 12a and the burner throat 28 is large), the flow direction of the tertiary air 15 is surely restricted. Is possible.
- the guide sleeve 20 can reliably supply the tertiary air 15 into the furnace 2 at a predetermined angle ⁇ 1, and the effect of reducing the unburned content and CO of the solid fuel is secured. To.
- FIG. 6 is a schematic view of the solid fuel burner 5-3 according to the second embodiment.
- the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
- the second angle ⁇ 2 of the burner throat 28 is larger than the first angle ⁇ 1 of the guide sleeve 20.
- the second angle ⁇ 2 of the burner throat 28 of the existing boiler device is about 45 degrees, and the solid fuel burner 5-3 is installed in the burner throat 28.
- the solid fuel burner 5-3 has a seal air introduction plate (sealed air introduction plate) at a position between the guide sleeve 20 and the burner throat 28 in addition to the configuration of the first embodiment. It is characterized in that the seal air introduction member) 40 is provided.
- the seal air introduction plate 40 is arranged so as to be inclined outward by a third angle ⁇ 3 from the burner central axis C in the radial direction, and the third angle ⁇ 3 is substantially the same as the first angle ⁇ 1. That is, the guide sleeve 20 and the seal air introduction plate 40 are inclined at substantially the same angle.
- the first angle ⁇ 1 and the third angle ⁇ 3 are set in the range of, for example, 10 degrees to 40 degrees, and more preferably in the range of 20 degrees to 30 degrees.
- the guide sleeve 20 and the seal air introduction plate 40 are provided at intervals in the radial direction by spacers (not shown), and are also fixed by bolts or welding (not shown). The spacing of the seal air introduction plate 40 by the spacer and the fixing by bolts or welding may be performed from the member side continuous with the burner throat 28 or the burner throat 28. Further, the tip position X3 of the seal air introduction plate 40 in the axial direction is set to be substantially the same as the tip position X2 of the guide sleeve 20.
- FIG. 7B is a diagram showing the air flow in the nozzle tip region of the solid fuel burner not provided with the seal air introduction plate 40, and the flow of the secondary air 14 and the tertiary air 15 is indicated by a solid arrow, and the gas in the furnace 2 is shown. The flow of each is indicated by a broken line arrow.
- the secondary air 14 flows in between the flame holder 23 and the guide sleeve 20 through the secondary air flow path 11a, collides with the guide ring 34, and is spread outward in the radial direction. Then, the secondary air 14 collides with the inner peripheral surface of the guide sleeve 20 and is supplied to the furnace 2 at substantially the spreading angle of the guide sleeve 20 (first angle ⁇ 1).
- the tertiary air 15 is supplied to the furnace 2 along the outer peripheral side of the guide sleeve 20 at an inclination of the guide sleeve 20 (first angle ⁇ 1).
- the secondary air 14 and the tertiary air 15 are supplied to the fireplace 2 at an inclination of the guide sleeve 20 (first angle ⁇ 1) with the guide sleeve 20 interposed therebetween, and after the outlet of the guide sleeve 20, the secondary air 14 and the tertiary air 15 are supplied to the furnace 2.
- the tertiary air 15 has an integrated flow.
- the secondary air 14 A circulating flow 52 is formed between the flow in which the secondary air 15 and the tertiary air 15 are integrated and the spreading portion of the burner throat 28 by an accompanying phenomenon in which the secondary air 14 and the tertiary air 15 are drawn into the integrated flow.
- a large circulating flow 53 attracted by the integrated flow of the secondary air 14 and the tertiary air 15 is formed, and a part of the circulating flow 52 is formed in the burner throat 28.
- Most of the circulating flow 53 is accompanied by a flow in which the secondary air 14 and the tertiary air 15 are integrated.
- the circulating flow 53 in the furnace 2 contains molten combustion ash, and a part of it also flows into the circulating flow 52 formed in the vicinity of the burner throat 28, so that the seal air introduction plate 40 is not provided.
- the molten ash may gradually adhere to the burner throat 28 to form a large clinker.
- the secondary air 14 and the tertiary air 15 may change the flow state of the integrated flow or block the air flow path.
- FIG. 7A is a diagram showing an air flow at the tip of the nozzle of the solid fuel burner 5-3 according to the second embodiment. Since the solid fuel burner 5-3 according to the second embodiment includes the seal air introduction plate 40, the air flow in the nozzle tip region is different from that in FIG. 7B. More specifically, in the solid fuel burner 5-3 according to the second embodiment, the secondary air 14 and the tertiary air 15 are integrated and ejected at an angle equivalent to the spreading angle of the guide sleeve 20. Since the seal air introduction plate 40 has the same spreading angle as the guide sleeve 20, the circulation flow 52 is not formed inside the seal air introduction plate 40.
- the seal air 55 (thick line in the figure), which is a part of the tertiary air 15, is introduced between the seal air introduction plate 40 and the burner throat 28, and is spread outward in the radial direction by the seal air introduction plate 40, and the burner throat It flows between 28 and is supplied into the furnace 2.
- the flow of the seal air 55 also suppresses the formation of the circulation zone of the burner throat 28.
- the seal air 55 is supplied into the furnace 2, it is accompanied by a flow in which the secondary air 14 and the tertiary air 15 are integrated.
- the circulation flow (return flow) 53 of the high-temperature gas in the fireplace 2 is also accompanied by the integrated flow of the secondary air 14 and the tertiary air 15.
- the inflow of the molten ash in the high temperature gas in 2 to the burner side can be suppressed, and the ash can be suppressed from adhering to the vicinity of the burner throat 28.
- the reducing flame region 50a can be narrowed as in the first embodiment, so that the unburned content and CO of the solid fuel can be reduced. Moreover, even if the solid fuel burner attached to the existing boiler device is replaced with the solid fuel burner 5-3 according to the second embodiment, since the seal air introduction plate 40 is provided, the vicinity of the burner throat 28 can be reached. Ash adhesion is suppressed. That is, the solid fuel burner 5-3 according to the second embodiment has a structure suitable for modifying an existing boiler device.
- FIG. 8 is a schematic view of the solid fuel burner 5-4 according to the third embodiment.
- the same configurations as those of the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted.
- the solid fuel burner 5-4 according to the third embodiment is the rear end portion (tertiary air 15) of the seal air introduction plate 40 in addition to the solid fuel burner 5-3 according to the second embodiment.
- a feature is that a seal air guide cylindrical portion (seal air guide member) 44 is provided at the upstream end of the flow.
- the seal air induction cylindrical portion 44 is provided in order to more reliably guide the seal air to the outside in the radial direction of the seal air introduction plate 40.
- the seal air induction cylindrical portion 44 has a cylindrical shape that is substantially parallel to the axial direction of the tertiary air nozzle 12, that is, has a substantially constant diameter, and is connected to the seal air introduction plate 40 on the downstream side. ..
- the length of the seal air induction cylindrical portion 44 can be arbitrarily designed so that the optimum seal air can be supplied, and may project into the space on the side where the swirler 22 is installed.
- FIG. 9 is a schematic view of the solid fuel burner 5-5 according to the fourth embodiment.
- the solid fuel burner 5-5 according to the fourth embodiment is the tip portion of the seal air introduction plate 40 (of the tertiary air 15) in addition to the solid fuel burner 5-4 according to the third embodiment.
- a feature is that a seal air deflection plate (seal air deflection member) 42 is provided at the downstream end of the flow).
- the seal air deflecting plate 42 extends radially outward from the tip end portion of the seal air introduction plate 40, and has a plane substantially perpendicular to the burner central axis C.
- FIG. 10 is a diagram showing an air flow at the tip of the nozzle of the solid fuel burner 5-5 according to the fourth embodiment.
- the seal air induced by the seal air induction cylindrical portion 44 is brought to the burner central axis C by the seal air introduction plate 40 by a third angle ⁇ 3 ( ⁇ 1).
- the air flows outward in the radial direction, collides with the seal air deflection plate 42, and is further deflected outward in the radial direction.
- the generation of the circulating flow 52 (see FIG. 7B) can be prevented more reliably as compared with the second or third embodiment, and the adhesion of ash to the vicinity of the burner throat 28 can be further prevented.
- FIG. 11 is a schematic view of the solid fuel burner 5-6 according to the fifth embodiment.
- the same configurations as those of the first to fourth embodiments are designated by the same reference numerals, and the description thereof will be omitted.
- the tip position X3 of the seal air introduction plate 40 is located on the furnace 2 side in the axial direction from the tip position X2 of the guide sleeve 20. The point is different from the solid fuel burner 5-5 according to the fourth embodiment. However, the tip position X3 of the seal air introduction plate 40 does not protrude inward from the inner peripheral surface of the water wall 19 of the fireplace 2.
- the tip position X3 of the seal air introduction plate 40 is slightly closer to the fireplace 2 than the tip position X2 of the guide sleeve 20, the secondary air 14 and the tertiary air 15 are radially outward. The spread of is further suppressed. As a result, the reducing flame region 50a can be surely narrowed as compared with the fourth embodiment, and the effect of reducing the unburned content and CO of the solid fuel is further enhanced.
- FIG. 12 is a schematic view of the solid fuel burner 5-7 of this example.
- the same configuration as in the case of one guide sleeve 20 is designated by the same reference numerals and the description thereof will be omitted.
- the solid fuel burner 5-7 of this example has the guide sleeves 20 (20a, 20b) in the radial direction in addition to the configuration of the solid fuel burner 5-3 according to the second to fifth embodiments.
- the feature is that a plurality of (for example, two) are provided.
- the tip positions X2 of the guide sleeves 20a and 20b and the tip positions X3 of the seal air introduction plate 40 are substantially the same in the axial direction.
- the sealed air introduction structure of FIG. 12 is based on the fourth embodiment (see FIG. 9).
- a plurality of guide sleeves 20a and 20b are provided in the radial direction, for example, when the width of the outlet portion of the tertiary air nozzle 12 in the radial direction is large (that is, the secondary air flow path 11a and the tertiary air).
- the flow direction of the tertiary air 15 can be reliably defined at the tip of the partition wall separating the flow path 12a and the burner throat 28).
- the guide sleeves 20a and 20b can reliably supply the tertiary air 15 into the furnace 2 at a predetermined angle ⁇ 1, the reducing flame region 50a can be reliably narrowed, and the solid fuel is not used as compared with the case where the guide sleeve 20 is one.
- the effect of reducing fuel content and CO becomes more reliable.
- FIG. 13 is a cross-sectional view of a main part of the solid fuel burner 5-7 shown in FIG.
- the two guide sleeves (combustion gas guide members) 20a and 20b are attached with a predetermined interval via the spacer 6. It is fixed by bolts 8 and nuts 9.
- a support 7 is provided on the seal air induction cylindrical portion (seal gas induction member) 44. The support 7 is for performing radial positioning between the sealed air induction cylindrical portion 44 and the outer peripheral surface of the secondary air nozzle 11.
- the seal air induction cylindrical portion 44, the seal air introduction plate (seal gas introduction member) 40, and the seal air deflection plate (seal gas deflection member) 42 are integrated, and the two guide sleeves 20 (20a, 20b) are also spacers. It is integrated via 6. Since the two guide sleeves 20a and 20b and the seal air introduction plate 40 are integrated, these parts constitute a nozzle tip unit NU (guide vane unit) for one solid fuel burner.
- NU guide vane unit
- the nozzle tip unit NU is detachably arranged on the outer peripheral side of the secondary air nozzle 11, and when the nozzle tip unit NU is fitted into the secondary air nozzle 11 from the outside, it is provided on the seal air induction cylindrical portion 44.
- the support 7 provides radial positioning. Further, since the tip positions X1, X2, and X3 in the axial direction are also fixed in an appropriate positional relationship in advance, the nozzle tip unit NU is fitted into the tip of the secondary air nozzle 11 and is arbitrarily fitted to the secondary air nozzle 11. Installation is completed simply by fixing with the fixing means.
- the nozzle tip unit NU may be directly or indirectly fixed to the burner throat 28. Further, the seal air induction cylindrical portion 44, the seal air introduction plate 40, and the seal air deflection plate 42 are integrated into the first unit, and the two guide sleeves 20a and 20b are integrated into a second unit different from the first unit.
- the first unit may be fixed to the burner throat 28 or a member continuous from the burner throat 28, and the second unit may be fixed to the secondary air nozzle 11.
- FIG. 14 is a schematic view of the solid fuel burner 5-8 according to the sixth embodiment.
- the same configurations as those of the first to fifth embodiments are designated by the same reference numerals, and the description thereof will be omitted.
- the solid fuel burner 5-8 according to the sixth embodiment includes the seal air introduction plate 40 and the burner throat 28 in addition to the configuration of the solid fuel burner 5-3 according to the second embodiment.
- a feature is that a seal air drift suppression plate (seal air drift suppression member) 48 for suppressing the drift of the seal air is further provided between them.
- the seal air drift suppression plate 48 is composed of, for example, a punching plate provided with a large number of holes and a plate provided with a large number of slits.
- the seal air drift suppression plate 48 By providing the seal air drift suppression plate 48, the seal air introduced to the outside in the radial direction of the seal air introduction plate 40 becomes a uniform flow and is supplied into the furnace 2, so that the formation of the circulation flow 52 is prevented. As a result, it is possible to prevent the adhesion of ash in the vicinity of the burner throat 28. Further, by providing the seal air drift suppression plate 48, it is not necessary to provide the seal air deflection plate 42. That is, the seal air drift suppression plate 48 is a member that can replace the seal air deflection plate 42 used in the fourth and fifth embodiments.
- FIG. 15 is a schematic view of the solid fuel burner 5-9 according to the seventh embodiment
- FIG. 16 is an enlarged view of the D1 portion shown in FIG.
- FIG. 17 is an enlarged view of the nozzle tip of the solid fuel burner according to the seventh embodiment. It is a figure which shows the state which was pulled out.
- the same configurations as those of the first to sixth embodiments are designated by the same reference numerals and the description thereof will be omitted.
- the solid fuel burner 5-9 according to the seventh embodiment is characterized in that a contraction forming member 60 is provided.
- a contraction forming member 60 is provided.
- the front plate 27 on which the fuel nozzle 10 is installed among the partition walls 18 can be taken out integrally with the fuel nozzle 10 during maintenance of the burner.
- the partition wall 18 is detachably supported by bolts, screws, hooks, and the like.
- the solid fuel burner 5-9 includes a flame holder 23.
- a plate-shaped fin member 36 extending along the flow direction of the secondary air 14 is installed in the secondary air flow path 11a.
- a plurality of fin members 36 are arranged at intervals along the circumferential direction of the flame holder 23, and are made of a radial plate material.
- a contraction forming member 60 is arranged on the upstream side of the fin member 36. As shown in FIG. 16, the contraction forming member 60 has an upstream wall portion 60a extending in the radial direction with respect to the burner central axis C and a downstream side in the flow direction of the secondary air 14 from the radial inner end of the upstream wall portion 60a. It has a tubular wall portion 60b extending to the side. Therefore, in the seventh embodiment, the contraction forming member 60 forms an annular gas flow path having an L-shaped cross section along the axial direction.
- the contraction forming member 60 has a tubular wall portion 60b that is fixedly supported by the fin member 36 and is integrally movable with the fin member 36. A small gap and play that can be moved are formed between the contraction forming member 60 and the secondary air nozzle 11.
- the contraction forming member 60 is installed on the outer peripheral side of the secondary air flow path 11a of the secondary air nozzle 11, so that the cross section of the flow path is once narrowed in the radial central axis direction. That is, the cross-sectional area of the secondary air flow path 11a is narrowed. After passing through the contraction forming member 60, the flow reaches the guide ring 34 in a compressed state, and forms a flow that spreads the direction of the flow outward from the burner central axis C.
- the contraction forming member 60 is a member separated from the secondary air nozzle 11 and is supported from the flame holder 23 side.
- the contraction forming member 60 is preferably composed of a ring-shaped member that is uniform over the entire circumferential direction, but may be divided into a plurality of members in the circumferential direction. Further, the contraction forming member 60 is preferably formed integrally with the flame holder 23, but may be formed separately.
- the above-mentioned minute gaps and play formed between the outer peripheral portion of the contraction forming member 60 and the inner wall surface of the secondary air nozzle 11 appear to be large, but they are actually extremely small.
- the flow rate of the secondary air 14 that short-passes here is almost negligible.
- the outer peripheral surface of the contraction forming member 60 (the surface facing the inner wall surface of the secondary air nozzle 11) has a sufficient length in the axial direction.
- the cross-sectional shape of the contraction forming member 60 is not limited to the L-shape shown in the drawing.
- the above-mentioned outer peripheral surface (with the inner wall surface of the secondary air nozzle 11)
- Various shapes such as a rectangular shape and a pentagonal shape with (opposing surfaces) extended can be applied.
- the guide sleeve 20 overlaps the guide ring 34 in the direction (axial direction) along the central axis C of the burner, and the guide ring 34 is guided.
- the tip position X2 of the guide sleeve 20 is closer to the furnace 2 side (right side in FIG. 16) than the tip position X1 of the ring 34. In other words, the tip position X2 is on the downstream side of the air flow than the tip position X1.
- the distance between the front side surface of the guide ring 34 (the side surface of the guide ring 34 facing the fireplace 2 and the side surface opposite to the side surface facing the furnace 2) and the tip of the inner peripheral surface of the guide sleeve 20, that is, the guide sleeve 20 guides.
- A be the length that overlaps the ring 34, and set the distance between the tip of the inner peripheral surface of the guide sleeve 20 and the outer peripheral end of the guide ring 34, that is, the gap between the guide sleeve 20 and the guide ring 34 in the height direction.
- B the relationship between the length A and the gap B is set so as to satisfy A> 0.5 ⁇ B.
- the tip position X2 of the guide sleeve 20 and the tip position X1 of the guide ring 34 are housed in the burner throat 28 and do not project from the inner peripheral surface of the water wall 19 toward the inside of the fireplace 2.
- the outer diameter L2 of the guide ring 34 is set to be smaller (L2 ⁇ L1).
- the outer diameter L2 of the guide ring 34 and the outer diameter of the contraction forming member 60 are set to the same outer diameter L2, but the outer diameter of the contraction forming member 60 is the secondary air nozzle 11. It suffices if it is smaller than the inner diameter of the guide ring 34, and the magnitude relationship with the outer diameter L2 of the guide ring 34 does not matter.
- the outer diameter L2 is set smaller than the outer diameter (inner diameter of the partition wall 18) L4 (see FIG. 15) of the front plate 27 (L2 ⁇ L4).
- the inner diameter (distance between the burner center axis C and the cylinder wall portion 60b) L3 of the contraction forming member 60 is set smaller than the outer diameter L2 of the guide ring 34 (L2>. L3). That is, in the seventh embodiment, L1> L2> L3 is set.
- FIG. 17 is a diagram showing a state in which the nozzle tip portion of the solid fuel burner 5-9 according to the seventh embodiment of the present invention is pulled out.
- the solid fuel burner 5-9 according to the seventh embodiment has a configuration that satisfies the dimensional relationship of L1> L2> L3, the front plate 27 is removed from the partition wall 18 and the fuel nozzle 10 is pulled out.
- the fuel nozzle 10, the flame holder 23, the guide ring 34, the fin member 36, and the contraction forming member 60 are integrally configured to be able to be pulled out toward the outside of the furnace 26.
- the outer diameter L4 of the front plate 27 is outside.
- the diameter can be set smaller than L2, and the fuel nozzle 10 can be moved with respect to the partition wall 18 without providing the front plate 27.
- FIG. 18 is a diagram showing an air flow in the nozzle tip region of the solid fuel burner 5-9.
- the primary air 13 is ejected from the fuel nozzle 10 into the furnace 2.
- the secondary air 14 flows in the secondary air nozzle 11 and collides with the guide ring 34 of the flame holder 23, and the flow direction is deflected outward in the radial direction. Since the tip position X2 of the guide sleeve 20 is located closer to the fireplace 2 than the tip position X1 of the guide ring 34, the secondary air 14 that collides with the guide ring 34 exceeds the guide ring 34 of the guide sleeve 20.
- the tertiary air 15 flows through the tertiary air nozzle 12, and while turning toward the outer peripheral side along the guide sleeve 20, inside the furnace 2 toward the outside in the radial direction at a first angle ⁇ 1 with respect to the burner central axis C. Squirt into.
- the tip position X2 of the guide sleeve 20 is closer to the fireplace 2 than the tip position X1 of the guide ring 34, the radial outward deflection of the secondary air 14 is suppressed by the guide sleeve 20.
- the first angle ⁇ 1 of the guide sleeve 20 is set to 10 to 40 degrees. Therefore, the secondary air 14 and the tertiary air 15 are deflected radially outward by the first angle ⁇ 1 of the guide sleeve 20 and are ejected into the fireplace 2.
- the reducing flame region 50a can be narrowed as compared with the above-mentioned conventional technique, and the generation of unburned components and CO of the solid fuel can be reduced.
- the solid fuel burner 5- In the step of disassembling 9, the guide ring 34 can be pulled out together with the fuel nozzle 10 and the like without being caught by the secondary air nozzle 11 (see FIG. 17). This improves maintainability.
- the contraction forming member 60 is arranged on the upstream side of the guide ring 34, when the secondary air 14 passes through the contraction forming member 60, the flow velocity becomes high and collides with the guide ring 34 at high speed. Then, it deflects outward in the radial direction. Therefore, in the configuration of the seventh embodiment, even if the outer diameter L2 of the guide ring 34 is small, the radial deflection of the ejected secondary air 14 becomes strong, and the circulation formed on the downstream side of the guide ring 34. The flow is secured. As a result, the flame is stabilized and low NOx performance is maintained.
- the contraction forming member 60 described in the seventh embodiment can be applied to the solid fuel burner according to the first to sixth embodiments described above.
- the seal air introduction plate 40 and the seal air deflection plate 42 may be provided, and the seal air induction cylindrical portion 44 may not be provided.
- the seal air induction cylindrical portion 44 may not be provided.
Abstract
Description
次に、本発明の第1実施形態に係る固体燃料バーナ5-1について説明する。図2は第1実施形態に係る固体燃料バーナ5-1の概略図、図3は図2に示すD部の拡大図である。図2に示すように、固体燃料バーナ5-1は、そのノズル先端(バーナ出口側)が火炉2の壁部である水壁19に穿設されたバーナスロート28に対して水平方向に挿入されるようにして、火炉2の水壁19に取り付けられる。なお、バーナスロート28は、その内周面がバーナ中心軸Cに対して第2の角度θ2で傾斜するように水壁19のバーナ5-1側(水壁19の外側)から火炉2側(水壁19の内側)に向かって拡径して形成された開口部である。
次に、本発明の第2実施形態に係る固体燃料バーナ5-3について説明する。図6は第2実施形態に係る固体燃料バーナ5-3の概略図である。なお、第1実施形態と同一構成については同一符号を付して説明を省略する。第2実施形態では、バーナスロート28の第2の角度θ2が、ガイドスリーブ20の第1の角度θ1より大きい場合を想定している。例えば、既設のボイラ装置のバーナスロート28の第2の角度θ2が45度程度であって、そのバーナスロート28に固体燃料バーナ5-3を設置する場合等が想定される。
次に、本発明の第3実施形態に係る固体燃料バーナ5-4について説明する。図8は第3実施形態に係る固体燃料バーナ5-4の概略図である。なお、第1および第2実施形態と同一構成については同一符号を付して説明を省略する。図8に示すように、第3実施形態に係る固体燃料バーナ5-4は、第2実施形態に係る固体燃料バーナ5-3に加えて、シール空気導入板40の後端部(三次空気15の流れの上流側の端部)に、シール空気誘導円筒部(シール空気誘導部材)44が設けられている点に特徴がある。
次に、本発明の第4実施形態に係る固体燃料バーナ5-5について説明する。図9は第4実施形態に係る固体燃料バーナ5-5の概略図である。なお、第1~第3実施形態と同一構成については同一符号を付して説明を省略する。図9に示すように、第4実施形態に係る固体燃料バーナ5-5は、第3実施形態に係る固体燃料バーナ5-4に加えて、シール空気導入板40の先端部(三次空気15の流れの下流側の端部)に、シール空気偏向板(シール空気偏向部材)42が設けられている点に特徴がある。シール空気偏向板42は、シール空気導入板40の先端部から径方向の外側に延在し、バーナ中心軸Cに対して略垂直な平面を有している。
次に、本発明の第5実施形態に係る固体燃料バーナ5-6について説明する。図11は第5実施形態に係る固体燃料バーナ5-6の概略図である。なお、第1~第4実施形態と同一構成については同一符号を付して説明を省略する。図11に示すように、第5実施形態に係る固体燃料バーナ5-6は、シール空気導入板40の先端位置X3がガイドスリーブ20の先端位置X2より軸方向において火炉2側に位置している点が、第4実施形態に係る固体燃料バーナ5-5と相違する。ただし、シール空気導入板40の先端位置X3は、火炉2の水壁19の内周面より内側に突出していない。
次に、本発明の第6実施形態に係る固体燃料バーナ5-8について説明する。図14は第6実施形態に係る固体燃料バーナ5-8の概略図である。なお、第1~第5実施形態と同一構成については同一符号を付して説明を省略する。図14に示すように、第6実施形態に係る固体燃料バーナ5-8は、第2実施形態に係る固体燃料バーナ5-3の構成に加えて、シール空気導入板40とバーナスロート28との間に、シール空気の偏流を抑制するためのシール空気偏流抑制板(シール空気偏流抑制部材)48がさらに設けられている点に特徴がある。このシール空気偏流抑制板48は、例えば、多数の孔が設けられたパンチングプレートや、多数のスリットが設けられたプレートで構成される。
次に、本発明の第7実施形態に係る固体燃料バーナ5-9について説明する。図15は第7実施形態に係る固体燃料バーナ5-9の概略図、図16は図15に示すD1部の拡大図、図17は第7実施形態に係る固体燃料バーナのノズル先端部が引き抜かれた状態を示す図である。なお、第1~第6実施形態と同一構成については同一符号を付して説明を省略する。
2 火炉
5-1~10 固体燃料バーナ
6 スペーサ
7 サポート
10 燃料ノズル(固体燃料ノズル)
11 二次空気ノズル
12 三次空気ノズル
13 一次空気(混合流体)
14 二次空気
15 三次空気
19 水壁(壁部)
20,20a,20b ガイドスリーブ(三次空気案内部材、燃焼用ガス案内部材)
23 保炎器
28 バーナスロート
34 案内リング(二次空気案内部材)
40 シール空気導入板(シール空気導入部材、シールガス導入部材)
42 シール空気偏向板(シール空気偏向部材、シールガス偏向部材)
44 シール空気誘導円筒部(シール空気誘導部材、シールガス誘導部材)
48 シール空気偏流抑制板(シール空気偏流抑制部材)
50a,50b 還元炎領域
60 縮流形成部材
C バーナ中心軸
NU ノズル先端ユニット(ガイドベーンユニット)
Claims (17)
- 火炉の壁部に穿設されたバーナスロートに挿入される固体燃料バーナであって、
固体燃料と一次空気との混合流体を噴出する固体燃料ノズルと、
前記固体燃料ノズルの外側に前記固体燃料ノズルと同心円状に設けられ、二次空気を噴出する二次空気ノズルと、
前記二次空気ノズルの外側に前記二次空気ノズルと同心円状に設けられ、三次空気を噴出する三次空気ノズルと、
前記固体燃料ノズルの先端外周部に位置して、二次空気の流れを径方向の外側に案内する二次空気案内部材と、
前記三次空気ノズルの先端部に位置して、三次空気の流れを前記固体燃料バーナの中心軸に対して第1の角度で径方向の外側に案内する1つ以上の三次空気案内部材と、を備えた固体燃料バーナにおいて、
前記固体燃料バーナの軸方向における前記三次空気案内部材の先端位置は、前記二次空気案内部材の先端位置より前記火炉側であり、
前記バーナスロートは、その内周面が前記中心軸に対して第2の角度で傾斜するように前記火炉の壁部のバーナ側から火炉側に向かって拡径して形成され、
前記第1の角度は、前記中心軸に対して10度~40度の範囲内に設定され、
前記第2の角度は、前記第1の角度より大きくなっており、
前記三次空気案内部材と前記バーナスロートとの間に、三次空気の一部をシール空気として導入するシール空気導入部材が設けられ、
前記シール空気導入部材は、前記中心軸に対して第3の角度で径方向の外側に傾斜しており、
前記シール空気導入部材の先端部に、前記シール空気を径方向の外側に偏向するためのシール空気偏向部材が設けられていることを特徴とする固体燃料バーナ。 - 請求項1に記載の固体燃料バーナにおいて、
前記シール空気導入部材における三次空気の流れの上流側の端部に、前記シール空気を前記シール空気導入部材に誘導するためのシール空気誘導部材がさらに設けられていることを特徴とする固体燃料バーナ。 - 請求項1または2に記載の固体燃料バーナにおいて、
前記固体燃料バーナの軸方向における前記シール空気導入部材の先端位置は、前記三次空気案内部材の先端位置と略同一または前記三次空気案内部材の先端位置より火炉側であることを特徴とする固体燃料バーナ。 - 請求項1~3の何れか1項に記載の固体燃料バーナにおいて、
前記第3の角度は、前記第1の角度と略同一に設定されていることを特徴とする固体燃料バーナ。 - 請求項1または2に記載の固体燃料バーナにおいて、
前記シール空気導入部材と前記バーナスロートとの間に、前記シール空気の偏流を抑制するためのシール空気偏流抑制部材がさらに設けられていることを特徴とする固体燃料バーナ。 - 請求項5に記載の固体燃料バーナにおいて、
前記シール空気偏流抑制部材は、多数の孔やスリットが形成されたプレートであることを特徴とする固体燃料バーナ。 - 請求項1~6の何れか1項に記載の固体燃料バーナを備えたことを特徴とするボイラ装置。
- 固体燃料と一次空気との混合流体を噴出する固体燃料ノズルと、
前記固体燃料ノズルの外周側に前記固体燃料ノズルと同心円状に設けられ、二次空気を噴出する二次空気ノズルと、
前記二次空気ノズルの外周側に前記二次空気ノズルと同心円状に設けられ、三次空気を噴出する三次空気ノズルと、
前記固体燃料ノズルの先端外周部に位置して、二次空気の流れを径方向の外側に案内する二次空気案内部材と、を備えた固体燃料バーナに適用され、前記二次空気ノズルの先端外周部に配置される固体燃料バーナのノズルユニットにおいて、
三次空気の流れを前記固体燃料バーナの中心軸に対して第1の角度で径方向の外側に案内する複数の三次空気案内部材と、
前記複数の三次空気案内部材の径方向の外側に設けられ、三次空気の一部をシール空気として導入し、前記第1の角度で径方向の外側に案内するシール空気導入部材と、
前記シール空気導入部材における三次空気の流れの上流側の端部に設けられ、前記シール空気を前記シール空気導入部材に誘導するためのシール空気誘導部材と、
前記シール空気導入部材の先端部に設けられ、前記シール空気を径方向の外側に偏向するためのシール空気偏向部材と、を備えたことを特徴とする固体燃料バーナのノズルユニット。 - 固体燃料と搬送ガスとの混合流体を噴出する固体燃料ノズルの先端外周部に着脱自在に配置され、前記固体燃料ノズルの外周側を流れる燃焼用ガスを案内するガイドベーンユニットであって、
燃焼用ガスの流れを前記固体燃料ノズルの中心軸に対して第1の角度で径方向の外側に案内すると共に、径方向に間隔を空けて配置された複数の燃焼用ガス案内部材と、
前記複数の燃焼用ガス案内部材の径方向の外側に設けられ、燃焼用ガスの一部をシールガスとして導入し、前記第1の角度で径方向の外側に案内するシールガス導入部材と、
前記シールガス導入部材における燃焼用ガスの流れの上流側の端部に設けられ、前記シールガスを前記シールガス導入部材に誘導するためのシールガス誘導部材と、
前記シールガス導入部材の先端部に設けられ、前記シールガスを径方向の外側に偏向するためのシールガス偏向部材と、を備えたガイドベーンユニット。 - 請求項1に記載の固体燃料バーナにおいて、
二次空気の流れ方向に対して、前記二次空気案内部材の上流側に配置され、二次空気の流れる流路の断面積を狭くする縮流形成部材を備え、
前記二次空気案内部材の外径は、前記二次空気ノズルの外周壁の内径より小さく形成され、
前記固体燃料バーナの軸方向における前記三次空気案内部材の先端位置は、前記二次空気案内部材の先端位置より前記火炉側であり、
前記固体燃料ノズル、前記二次空気案内部材および前記縮流形成部材が、一体的に前記バーナスロートから引き抜き可能に構成される
ことを特徴とする固体燃料バーナ。 - 請求項10に記載の固体燃料バーナにおいて、
前記二次空気ノズルの外周壁の内径をL1とし、前記二次空気案内部材の外径をL2とし、前記縮流形成部材の内径をL3とした場合に、
L1>L2>L3
の関係にあることを特徴とする固体燃料バーナ。 - 請求項10に記載の固体燃料バーナにおいて、
前記シール空気導入部材における三次空気の流れの上流側の端部に、前記シール空気を前記シール空気導入部材に誘導するためのシール空気誘導部材がさらに設けられていることを特徴とする固体燃料バーナ。 - 請求項10または12に記載の固体燃料バーナにおいて、
前記シール空気導入部材の先端部に、前記シール空気を径方向の外側に偏向するためのシール空気偏向部材がさらに設けられていることを特徴とする固体燃料バーナ。 - 請求項10、12、13の何れか1項に記載の固体燃料バーナにおいて、
前記固体燃料バーナの軸方向における前記シール空気導入部材の先端位置は、前記三次空気案内部材の先端位置と同一または前記三次空気案内部材の先端位置より火炉側であることを特徴とする固体燃料バーナ。 - 請求項10、12、13、14の何れか1項に記載の固体燃料バーナにおいて、
前記第3の角度は、前記第1の角度と略同一に設定されていることを特徴とする固体燃料バーナ。 - 請求項10または12に記載の固体燃料バーナにおいて、
前記シール空気導入部材と前記バーナスロートとの間に、前記シール空気の偏流を抑制するためのシール空気偏流抑制部材がさらに設けられていることを特徴とする固体燃料バーナ。 - 請求項16に記載の固体燃料バーナにおいて、
前記シール空気偏流抑制部材は、多数の孔やスリットが形成されたプレートであることを特徴とする固体燃料バーナ。
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AU2020276989A AU2020276989B2 (en) | 2019-05-13 | 2020-04-23 | Solid fuel burner, boiler device, nozzle unit of solid fuel burner, and guide vane unit |
CN202080004303.4A CN112513526A (zh) | 2019-05-13 | 2020-04-23 | 固体燃料燃烧器、锅炉装置、固体燃料燃烧器的喷嘴单元及导流叶片单元 |
JP2020543129A JP6792102B1 (ja) | 2019-05-13 | 2020-04-23 | 固体燃料バーナ、ボイラ装置、固体燃料バーナのノズルユニット、およびガイドベーンユニット |
US16/973,891 US11692705B2 (en) | 2019-05-13 | 2020-04-23 | Solid fuel burner, boiler equipment, nozzle unit for solid fuel burner, and guide vane unit |
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