Pulverized coal combustion burner

Abstract

To provide a pulverized coal combustion burner to which a ceramic liner can be mounted through a simple operation while preventing dropping of the ceramic liner.SOLUTION: A pulverized coal combustion burner includes: a burner inner cylinder 20; a burner outer cylinder 30 disposed on the outer side of the burner inner cylinder 20; a pulverized coal introduction pipe 40 provided in the burner outer cylinder 30 to introduce pulverized coal C to an outer peripheral surface 20b of the burner inner cylinder 20; an outer frame part disposed at a predetermined angle from a vertical upper side viewed from an inner cylinder axial direction of the burner inner cylinder 20 on the outer peripheral surface 20b; and a tile-shaped ceramic liner disposed in a range surrounded by the outer frame part and bonded to the outer peripheral surface 20b.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a pulverized coal combustion burner. [Background technology]

[0002] Conventionally, pulverized coal combustion burners installed in coal-fired boilers pulverize coal in a coal pulverizer, mix the pulverized coal with combustion air, and inject this mixed fluid from a burner nozzle into the boiler furnace to combust the pulverized coal. This pulverized coal combustion burner includes a burner inner cylinder, a burner outer cylinder arranged outside the burner inner cylinder, and a pulverized coal inlet pipe attached to the burner outer cylinder and introducing the pulverized coal into the outer peripheral surface of the burner inner cylinder. The pulverized coal flows in a tangential direction of the burner inner cylinder, generating a swirling flow in the space between the burner inner cylinder and the burner outer cylinder, forming a region with a high concentration of pulverized coal, thereby improving the ignition ability of the pulverized coal (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-118105 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-225985 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional pulverized coal combustion burner described above, the pulverized coal supplied from the pulverized coal inlet pipe to the inside of the burner outer cylinder collides with the outer peripheral surface of the burner inner cylinder, causing wear. For this reason, in the past, the outer peripheral surface of the burner inner cylinder was repaired by overlaying to suppress wear, but this overlay repair had to be repeated many times.

[0005] In order to reduce such maintenance burden, it has been considered to attach a ceramic liner to the outer peripheral surface of the burner inner cylinder to improve its wear resistance. Ceramic liners cannot be joined to metal (base material) by welding. For this reason, a method is known in which through-holes are formed in the ceramic liner in the thickness direction and studs are welded, as described in Patent Document 2. However, this requires complicated installation work, and therefore there is a need for a method that allows the ceramic liner to be attached with simple work while preventing the ceramic liner from falling off, and there is room for improvement in this regard.

[0006] An object of the present invention is to provide a pulverized coal combustion burner in which the ceramic liner can be attached with a simple procedure while preventing the ceramic liner from falling off. [Means for solving the problem]

[0007] One aspect of the present invention is a pulverized coal combustion burner comprising a burner inner tube, a burner outer tube arranged outside the burner inner tube, an introduction section provided on the burner outer tube for introducing pulverized coal onto the outer peripheral surface of the burner inner tube, an outer frame section arranged on the outer peripheral surface at a predetermined angle from vertically above as viewed in the axial direction of the burner inner tube, and a tile-shaped ceramic liner arranged in an area surrounded by the outer frame section and adhered to the outer peripheral surface.

[0008] According to the present invention, a ceramic liner is provided on the outer peripheral surface of the burner inner tube, against which pulverized coal introduced from the introduction portion collides, thereby improving the wear resistance of the outer peripheral surface of the burner inner tube. In this case, an outer frame can be fixed to the outer peripheral surface of the burner inner tube by welding, and the tile-shaped ceramic liner can be held by the fixed outer frame and fixed to the outer peripheral surface of the burner inner tube by adhesive. The ceramic liner, which is held from the outer peripheral side by the outer frame in this way, can be prevented from shifting or falling off due to long-term collision with pulverized coal. Furthermore, in the present invention, the inner ceramic liner can be held by the outer frame, so a simple attachment method can be used in which the ceramic liner is fixed to the outer surface of the burner inner cylinder by adhesive. This eliminates the need for complicated processing and labor, such as drilling holes in the ceramic liner, as in the past, and allows the ceramic liner to be attached with simple work.

[0009] In addition, in the present invention, it is preferable that the ceramic liner is arranged by arranging multiple tiles in rows and columns, and that within the above range, at least one of the rows and columns of joints between adjacent tiles is staggered between the tiles.

[0010] According to the present invention, the joints between adjacent tiles in at least one of the rows and columns are not linearly continuous, which reduces wear and deterioration of the tiles through the joints and reduces the frequency of maintenance of the ceramic liner.

[0011] In addition, the present invention may be characterized in that the ceramic liner contains aluminum oxide.

[0012] According to the present invention, the strength of the ceramic liner can be improved and the progression of wear caused by the collision of pulverized coal can be suppressed, thereby reducing the frequency of maintenance of the ceramic liner.

[0013] The present invention may be characterized in that it is provided in an ammonia co-firing furnace that co-fires ammonia gas and pulverized coal.

[0014] The present invention can be effectively applied to an ammonia co-firing furnace that aims to switch from coal to ammonia as fuel. [Effects of the Invention]

[0015] According to the pulverized coal combustion burner of the present invention, the ceramic liner can be attached with a simple operation while preventing the ceramic liner from falling off. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a side view showing the configuration of a boiler furnace equipped with a pulverized coal combustion burner according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the pulverized coal combustion burner as seen obliquely from the front. [Figure 3] FIG. 2 is a side view showing the arrangement of a plurality of pulverized coal combustion burners provided on one side wall of the boiler furnace. [Figure 4] FIG. 2 is a perspective view of a liner reinforcement portion attached to a burner inner cylinder. [Figure 5] FIG. 2 is a front view of a liner reinforcement portion attached to a burner inner cylinder. [Figure 6] FIG. 2 is a plan view showing an example of a liner reinforcement portion. [Figure 7] FIG. 10 is a plan view showing another example of a liner reinforcement portion. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, a pulverized coal combustion burner according to an embodiment of the present invention will be described with reference to the drawings.

[0018] As shown in FIG. 1, the pulverized coal combustion burner 1 of the embodiment is applied to a boiler furnace 10 of an ammonia co-firing furnace in a coal-fired power plant, for example, and injects a mixed gas obtained by co-firing ammonia gas and pulverized coal into an upstream portion 10A of the boiler furnace 10 to combust the pulverized coal.

[0019] A plurality of pulverized coal combustion burners 1 are provided in the boiler furnace 10. In Fig. 1, the plurality of pulverized coal combustion burners 1 are indicated by two-dot chain lines only at the front of the page. Combustion gas G generated by the plurality of pulverized coal combustion burners 1 in the upstream portion 10A of the boiler furnace 10 moves to the downstream portion 10B of the boiler furnace 10 and flows into a chimney (not shown).

[0020] FIG. 2 is a perspective view of the pulverized coal combustion burner 1 according to the embodiment, as viewed obliquely from the front. As shown in Fig. 2, throats 12 are formed at predetermined positions on the front and rear walls 11 of the boiler furnace 10. A burner duct 13 that covers the pulverized coal combustion burner 1 from the outside is arranged outside the boiler furnace 10 near the throat 12. The burner duct 13 supplies secondary air E2 for combustion to the boiler furnace 10.

[0021] The pulverized coal combustion burner 1 shown in FIG. 2 is disposed at the center of the throat 12, with a burner duct 13 penetrating through it.

[0022] FIG. 3 shows the arrangement of a plurality of pulverized coal combustion burners 1 provided on one of the front and rear walls 11 of the boiler furnace 10 . As shown in FIGS. 1 and 3, a plurality of pulverized coal combustion burners 1 are arranged on the front and rear walls 11 (front wall 11A, rear wall 11B) of the boiler furnace 10. Specifically, the plurality of pulverized coal combustion burners 1 are arranged in three rows in the vertical direction. Eight pulverized coal combustion burners 1 are arranged in each row along the horizontal direction. The eight pulverized coal combustion burners 1 arranged in each row are arranged four on each side of the horizontal center of each row.

[0023] As shown in Fig. 2, the pulverized coal combustion burner 1 includes a burner inner cylinder 20, a burner outer cylinder 30, a pulverized coal introduction pipe 40 (introduction section), and an ammonia supply pipe 50. The burner inner cylinder 20 and the burner outer cylinder 30 form a nozzle having an outlet at the tip for ejecting a mixed fluid. In other words, the nozzle has a double-cylinder structure having the burner inner cylinder 20 and the burner outer cylinder 30 arranged concentrically about the burner central axis O.

[0024] Here, the burner inner cylinder 20 and the burner outer cylinder 30 are arranged with their respective central axes as a common axis. Hereinafter, this common axis will be referred to as the burner central axis O, the direction along the burner central axis O will be referred to as the front-rear direction X, the opening side of the burner along the front-rear direction X will be referred to as the front side X1, and the opposite side will be referred to as the rear side X2. In addition, the direction that intersects with the burner central axis O as viewed from the front-rear direction X will be referred to as the radial direction, and the direction that circles around the burner central axis O will be referred to as the circumferential direction. The axial direction of the burner central axis O corresponds to the axial direction of the inner cylinder and the axial direction of the outer cylinder.

[0025] The burner inner cylinder 20 is disposed at the center of the pulverized coal combustion burner 1, and has a substantially cylindrical, narrowed portion (inner cylinder nozzle 21) whose diameter gradually decreases toward the first tip opening 20a. The burner inner cylinder 20 is made of metal. The rear end of the burner inner cylinder 20 is fixed to a flange 16 that is fixed to the burner duct 13. An ammonia supply pipe 50 is inserted at the axial center position of the burner inner cylinder 20. A predetermined region of the outer circumferential surface 20b of the burner inner cylinder 20 is covered by a plate-shaped liner reinforcing portion 60 (described later). Inside the burner inner cylinder 20, the ammonia supply pipe 50 and an oil burner 51 are inserted coaxially with the burner central axis O.

[0026] The ammonia supply pipe 50 is a tubular member through which ammonia gas A flows, and extends from the rear side X2 of the burner inner cylinder 20 to the vicinity of the first tip opening 20a. The rear end of the ammonia supply pipe 50 forms an ammonia supply port 50a. The ammonia supply port 50a protrudes further toward the rear side X2 than the burner base end 1a of the pulverized coal combustion burner 1. The ammonia supply pipe 50 supplies ammonia gas A into the burner inner cylinder 20. In the burner inner cylinder 20, a combustion flame is generated by ammonia gas A using an oil burner 51.

[0027] The burner outer cylinder 30 is arranged outside the burner inner cylinder 20 at a distance and has a hollow cylindrical shape. The burner outer cylinder 30 is arranged concentrically with the burner inner cylinder 20. The burner outer cylinder 30 is made of metal. The rear end of the burner outer cylinder 30 is fixed to the flange 16. The rear end portion of the burner outer cylinder 30 forms a cylindrical portion 30b with a substantially uniform diameter, and in the middle portion of the burner outer cylinder 30, forms a tapered portion 30c whose diameter gradually decreases from the cylindrical portion 30b toward the tip end (front side X1). The second tip opening 30a of the burner outer cylinder 30 has a throttle portion (outer cylinder nozzle 31) whose diameter further decreases from the tapered portion 30c toward the front side X1. The outer cylinder nozzle 31 has a larger diameter than the inner cylinder nozzle 21.

[0028] A pulverized coal flow passage 32 is formed between the burner outer cylinder 30 and the burner inner cylinder 20, extending over the entire circumference and forming a second tip opening 30a at the front. Pulverized coal C flows into the pulverized coal flow passage 32.

[0029] An inlet 41, which serves as a discharge port for supplying pulverized coal to the pulverized coal flow passage 32, is provided near the rear end of the burner outer casing 30. A pulverized coal introduction pipe 40 extending tangentially to the burner outer casing 30 protrudes from the inlet 41. The inlet 41 is disposed at a predetermined angle (first angle) from vertically above when viewed from the direction of the burner central axis O. The first angle of the inlet 41 is set appropriately according to the installation position of the pulverized coal combustion burner 1 and the state of the combustion flame in the boiler furnace. The inlet 41 is connected to the pulverized coal introduction pipe 40, which guides pulverized coal C supplied together with primary air E1 from a coal pulverizer (mill) (not shown) into the pulverized coal flow passage 32 in the burner outer casing 30.

[0030] The pulverized coal introduction pipe 40 is connected near the rear end of the burner outer casing 30 and introduces pulverized coal C to the outer peripheral surface 20b of the burner inner casing 20. The pulverized coal introduction pipe 40 supplies a mixed fluid (a mixed gas of pulverized coal C and primary air E1) in a tangential direction along the inner surface of the burner outer casing 30, forming a swirling flow of the mixed fluid. A pulverized coal supply device and a blower (not shown) are provided upstream of the pulverized coal introduction pipe 40, and a mixed fluid in which pulverized coal C and combustion air (primary air E1) are mixed in advance is introduced.

[0031] The pulverized coal introduction pipe 40 has an annular pipe 42 extending circumferentially along the outer circumferential surface of the burner outer casing 30, and a supply pipe 43 connected to a part of the annular pipe 42. One end of the annular pipe 42 is connected to the introduction port 41, and the other end is connected to the supply pipe 43. A connection portion 43a between the supply pipe 43 and the annular pipe 42 is disposed at a predetermined angle (second angle) from vertically above when viewed from the direction of the burner central axis O (see FIG. 3).

[0032] 3, the pulverized coal introduction pipes 40 provided in the multiple pulverized coal combustion burners 1 are connected to the upper half region from the horizontal position to the upper end of the burner outer casing 30. The eight pulverized coal combustion burners 1 arranged in each row have their pulverized coal introduction pipes 40 connected to the burner outer casing 30 at different connection positions (installation angles) from each other.

[0033] 2, the positions of the inlet 41 and the connecting portion 43a are different, but they may be in the same position. That is, the annular pipe 42 may be omitted, and the connecting portion 43a may be connected to the inlet 41. In this case, the first angle of the inlet 41 and the second angle of the connecting portion 43a are the same angle.

[0034] 2, the end of the supply pipe 43 opposite to the connection part 43a is a pulverized coal inlet 43b. Pulverized coal C and primary air E1 are supplied to the pulverized coal introduction pipe 40 from the pulverized coal inlet 43b, pass through the supply pipe 43 and the annular pipe 42, and are introduced into the pulverized coal flow passage 32 in the burner outer casing 30 from the introduction port 41.

[0035] In the space formed between the throat 12 and the burner duct 13, outer vanes 14 for adjusting the swirl force of the secondary air E2 are arranged in a circular shape around the throat 12. A plurality of inner vanes 15 for separating the secondary air E2 into inner and outer parts are arranged circumferentially inside the outer vanes 14. The burner duct 13 and the rear end of the burner inner cylinder 20 are connected by a tertiary air communication part 22. The tertiary air communication part 22 guides tertiary air (not shown) to the burner inner cylinder 20.

[0036] Fig. 4 is a perspective view of the liner reinforcement part 60 attached to the burner inner cylinder 20. Fig. 5 is a front view of the liner reinforcement part 60 attached to the burner inner cylinder 20 as seen from the front. 4 and 5, a liner reinforcing part 60 made of an abrasion-resistant material is attached to the outer peripheral surface 20b at the rear end of the burner inner cylinder 20, and is disposed between the burner outer cylinder 30 and the inner periphery at the rear end thereof to prevent abrasion of the outer peripheral surface 20b at the rear end of the burner inner cylinder 20 due to pulverized coal C supplied from the pulverized coal introduction pipe 40 via the introduction port 41. The liner reinforcing part 60 is provided to suppress abrasion of the outer peripheral surface 20b of the burner inner cylinder 20 due to collision with the pulverized coal C supplied from the introduction port 41 of the pulverized coal introduction pipe 40.

[0037] Fig. 6 is a plan view showing an example of the liner reinforcement portion 60. Fig. 7 is a plan view showing another example of the liner reinforcement portion 60. 4 to 7, the liner reinforcement part 60 includes an outer frame part 61 and a ceramic liner 62. The liner reinforcement part 60 forms a curved surface that curves in the circumferential direction along the outer peripheral surface 20b of the burner inner cylinder 20. The liner reinforcement part 60 is rectangular in plan view, with the long side direction parallel to the burner central axis O and the short side direction parallel to the circumferential direction.

[0038] The liner reinforcement part 60 is arranged on the outer peripheral surface 20b of the burner inner cylinder 20 at a predetermined installation angle from vertically above when viewed in the direction of the burner central axis O (the axial direction of the inner cylinder of the burner inner cylinder 20). The installation angle of the liner reinforcement part 60 at the circumferential center is approximately the same position as the first angle of the inlet 41 of the pulverized coal inlet pipe 40. The liner reinforcement part 60 is arranged in an area overlapping at least with the inlet 41 when viewed in the radial direction. Note that the area of ​​the liner reinforcement part 60 overlapping with the inlet 41 is not limited to overlapping with the entire inlet 41, and may be an area overlapping with at least a portion of the inlet 41.

[0039] The outer frame portion 61 is formed in a rectangular frame shape in a plan view, with its long sides 61a parallel to the burner central axis and its short sides 61b parallel to the circumferential direction. The inner area surrounded by the outer frame portion 61 is the liner installation range R of the ceramic liner 62. The outer frame portion 61 is made of a long steel material having a predetermined thickness. The outer frame portion 61 is fixed to the outer peripheral surface 20b of the burner inner cylinder 20 by welding. The width of the outer frame portion 61 may be any dimension that provides strength enough to fix the outer peripheral surface 20b without falling off. The thickness of the outer frame portion 61 is set to a level that can restrict lateral movement of the ceramic liner 62, for example, to the same thickness as the ceramic liner 62. For example, if the ceramic liner 62 is 5 mm thick, the thickness of the outer frame portion 61 is also set to 5 mm. The outer frame 61 and the ceramic liner 62 do not necessarily have to have the same thickness. For example, the thickness of the outer frame 61 may be set to be slightly larger than the thickness of the ceramic liner 62 .

[0040] The ceramic liner 62 is arranged in a liner installation range R surrounded by the outer frame portion 61. The ceramic liner 62 is provided by arranging a plurality of tiles 621 in rows and columns, which are adhered to the outer peripheral surface 20b of the burner inner cylinder 20 using an adhesive. In this embodiment, the joints 62a of the rows in which the tiles 621 are arranged are oriented along the long sides of the outer frame 61, and the joints 62b of the columns are oriented along the short sides. The tiles 621 may have, for example, a square shape measuring 20 mm in length and width and 5 mm in thickness when viewed from above. The planar shape of the tiles 621 is not limited to a square, and may be, for example, 10 mm in length and 20 mm in width, with a different aspect ratio.

[0041] The ceramic liner 62 (62A) shown in Figures 4 and 6 is arranged in a staggered manner within the liner installation range R surrounded by the outer frame portion 61, with the joints 62b between adjacent rows of tiles 621 offset between the tiles 621. In addition, the ceramic liner 62 (62B) shown in Figure 7 is arranged such that, within the liner installation range R surrounded by the outer frame portion 61, the row joints 62a and column joints 62b between adjacent tiles 621 are arranged in a straight line between the tiles 621.

[0042] The tiles 621 of the ceramic liner 62 are wear-resistant tiles made of a material containing aluminum oxide. A specific example of the material for the tiles 621 of the ceramic liner 62 is 92.34% aluminum oxide (AL2O3), 5.07% silicon dioxide (SiO2), 0.06% iron oxide (Fe2O3), and 2.53% others. This specific example material has a hardness of 13 HmV or more, a bending strength of 280 MPa, and a compressive strength of 1760 MPa.

[0043] 2, in the pulverized coal combustion burner 1 configured as described above, pulverized coal C is supplied together with primary air E1 from a mill (not shown) through a pulverized coal inlet pipe 40 and an inlet port 41 to the pulverized coal flow passage 32 inside the burner outer casing 30. A swirling force is applied to the supplied pulverized coal C at the rear end of the burner outer casing 30, causing the pulverized coal C to flow toward the tip side while swirling circumferentially through the pulverized coal flow passage 32 between the burner inner casing 20 and the burner outer casing 30, and is then ejected from the second tip opening 30a of the burner outer casing 30 into the throat 12. The mixed gas ejected from the second tip opening 30a is mixed with ammonia gas A ejected from the first tip opening 20a of the burner inner casing 20, and is mixed with secondary air E2 supplied mainly from the burner duct 13 and combusted in the boiler furnace 10.

[0044] Next, the operation of the pulverized coal combustion burner 1 will be described in detail with reference to FIGS. The pulverized coal combustion burner 1 according to this embodiment comprises a burner inner tube 20, a burner outer tube 30 arranged outside the burner inner tube 20, a pulverized coal introduction pipe 40 provided in the burner outer tube 30 and introducing pulverized coal C to the outer peripheral surface of the burner inner tube 20, an outer frame portion 61 arranged on the outer peripheral surface 20b at a predetermined angle from vertically above as viewed from the axial direction of the inner tube of the burner inner tube 20, and a tile-shaped ceramic liner 62 arranged in the range surrounded by the outer frame portion 61 (liner installation range R) and adhered to the outer peripheral surface 20b.

[0045] According to the pulverized coal combustion burner 1 of this embodiment, the ceramic liner 62 is provided on the outer peripheral surface 20b of the burner inner tube 20, on which the pulverized coal C introduced from the pulverized coal introduction pipe 40 to the outer peripheral surface 20b of the burner inner tube 20 collides, thereby improving the wear resistance of the outer peripheral surface 20b of the burner inner tube 20. In this case, the outer frame portion 61 can be fixed to the outer peripheral surface 20b of the burner inner tube 20 by welding, and the tile-shaped ceramic liner 62 can be held by the fixed outer frame portion 61 and fixed to the outer peripheral surface 20b of the burner inner tube 20 by adhesive. The ceramic liner 62 held from the outer periphery by the outer frame portion 61 in this way can be prevented from shifting or falling off due to long-term collision with the pulverized coal C.

[0046] Furthermore, in this embodiment, the inner ceramic liner 62 can be held by the outer frame portion 61, so a simple attachment method can be adopted in which the ceramic liner 62 is fixed to the outer peripheral surface 20b of the burner inner cylinder 20 by adhesive. This eliminates the need for complicated processing and labor, such as drilling holes in the ceramic liner, as in the past, and allows the ceramic liner 62 to be attached with simple work.

[0047] Furthermore, according to this embodiment, the ceramic liner 62 is provided by arranging a plurality of tiles 621 in rows and columns. Within the range (liner installation range R), at least one of the rows and columns of joints between adjacent tiles 621 is staggered so that the tiles are offset from one another. With this configuration, the joints between adjacent tiles 621 in at least one of the rows and columns are not linearly continuous, which makes it possible to suppress wear and deterioration of the tiles 621 through the joints and reduce the frequency of maintenance of the ceramic liner 62.

[0048] Furthermore, in this embodiment, since the ceramic liner 62 contains aluminum oxide, the strength of the ceramic liner 62 can be improved and the progression of wear caused by the collision of the pulverized coal C can be suppressed. Therefore, the maintenance frequency of the ceramic liner 62 can be reduced.

[0049] In this embodiment, the ammonia co-firing furnace is provided for co-firing ammonia gas A and pulverized coal C. In this case, the present invention can be effectively applied to an ammonia co-firing furnace that aims to replace coal with ammonia as fuel.

[0050] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents.

[0051] For example, in this embodiment, the ceramic liner 62, which is provided by arranging multiple tiles in rows and columns, is configured such that, within the area surrounded by the outer frame portion 61 (liner installation area R), at least one of the rows and columns of joints between adjacent tiles 621 is arranged in a staggered arrangement (see Figure 6) in which the tiles 621 are offset from each other, or in a linear arrangement with no offset (see Figure 7), but is not limited to such an arrangement.

[0052] In addition, in this embodiment, the ceramic liner 62 uses a ceramic material containing aluminum oxide, but a material that does not contain aluminum oxide may also be used.

[0053] Furthermore, in this embodiment, the outer frame portion 61 of the liner reinforcement portion 60 has a rectangular shape, but it may have other shapes such as a square, a circle, or an oval.

[0054] In addition, in this embodiment, the boiler furnace in which the pulverized coal combustion burner 1 is provided is an ammonia co-firing furnace that co-fires ammonia gas and pulverized coal, but the pulverized coal combustion burner 1 of this embodiment can also be used in, for example, a conventional coal-only firing furnace. [Explanation of symbols]

[0055] 1 pulverized coal combustion burner, 10 boiler furnace, 20 burner inner tube, 20a first tip opening, 20b outer circumferential surface, 21 inner tube nozzle, 30 burner outer tube, 30a second tip opening, 31 outer tube nozzle, 32 pulverized coal flow passage, 40 pulverized coal inlet pipe (inlet portion), 41 inlet, 42 annular tube, 43 supply pipe, 50 ammonia supply pipe, 51 oil burner, 60 liner reinforcement portion, 61 outer frame portion, 62, 61A, 62B ceramic liner, 621 tile, A ammonia gas, E1 primary air, E2 secondary air, O burner central axis, R liner installation range (range)

Claims

1. a burner inner cylinder; a burner outer cylinder arranged outside the burner inner cylinder; An introduction portion provided in the burner outer cylinder and introducing pulverized coal into the outer peripheral surface of the burner inner cylinder; an outer frame portion of the outer peripheral surface that is disposed at a predetermined angle from vertically above when viewed in the axial direction of the burner inner cylinder; a tile-shaped ceramic liner disposed within an area surrounded by the outer frame portion and bonded to the outer peripheral surface; A pulverized coal combustion burner comprising:

2. the ceramic liner is provided with a plurality of tiles arranged in rows and columns; Within the range, at least one of the rows and columns of joints between adjacent tiles is staggered between the tiles.

2. The pulverized coal combustion burner according to claim 1.

3. the ceramic liner comprises aluminum oxide; 2. The pulverized coal combustion burner according to claim 1.

4. The ammonia gas is mixed with pulverized coal and the ammonia co-combustion furnace is provided with the ammonia co-combustion furnace. A pulverized coal combustion burner according to any one of claims 1 to 3.

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