Burner, boiler, and operation method of burner

Abstract

To suppress blockage of a fuel gas supply opening and an oxidized gas supply opening.SOLUTION: A gas burner 100 includes: a burner nozzle 10 in which a fuel gas supply opening 11a which opens to a furnace and supplies a fuel gas to the furnace, and an air supply opening 12a which opens to the furnace and supplies combustion air to the furnace are formed; and a cleaning device 20 which has a first jetting hole for jetting toward the fuel gas supply opening 11a from the upstream side in a fuel gas flow, and a second jetting hole for jetting steam toward the air supply opening 12a from the upstream side in a combustion air flow, and jets steam simultaneously from the first jetting hole and the second jetting hole.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to burners and boilers, and methods of operating burners. [Background technology]

[0002] Conventionally, there is known a riffle-type burner that promotes the mixing of fuel gas and air to improve the combustibility of low-calorie gases, etc. (See, for example, Patent Document 1). In the burner disclosed in Patent Document 1, some of the multiple tip segments are used as gas outlets, and the rest are used as air outlets. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 62-136725 Summary of the Invention [Problem to be solved by the invention]

[0004] When fuel containing ash (or minerals such as Na, Ca, K, etc.) is used in combustion equipment such as boilers, ash (or floating matter containing minerals) is generated during combustion. When ash is generated, it may flow into the inside of the burner nozzle through the openings that eject fuel and air, and accumulate and solidify inside the nozzle. If ash accumulates and solidifies inside the nozzle, it could clog the openings that eject fuel and air.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a burner and boiler, as well as a method for operating a burner, that can suppress blockage of the fuel gas supply opening and the oxidizing gas supply opening. [Means for solving the problem]

[0006] In order to solve the above problems, the burner and boiler, and the burner operating method of the present disclosure employ the following measures. A burner according to one embodiment of the present disclosure has a burner nozzle having a fuel gas supply opening that opens into a furnace and supplies fuel gas to the furnace, and an oxidizing gas supply opening that opens into the furnace and supplies oxidizing gas to the furnace, a first injection section that injects purge fluid toward the fuel gas supply opening from the upstream side in the fuel gas flow, and a second injection section that injects purge fluid toward the oxidizing gas supply opening from the upstream side in the oxidizing gas flow, and is equipped with a purge fluid injection section that injects purge fluid from the first injection section and the second injection section simultaneously.

[0007] A method of operating a burner according to one embodiment of the present disclosure includes a burner having a burner nozzle formed with a fuel gas supply opening that opens into a furnace and supplies fuel gas to the furnace, and an oxidizing gas supply opening that opens into the furnace and supplies oxidizing gas to the furnace, and a purge fluid injection unit having a first injection unit that injects purge fluid from the upstream side in the fuel gas flow toward the fuel gas supply opening, and a second injection unit that injects purge fluid from the upstream side in the oxidizing gas flow toward the oxidizing gas supply opening, and includes an injection process of simultaneously injecting purge fluid from the first injection unit and the second injection unit. Effect of the Invention

[0008] According to the present disclosure, clogging of the fuel gas supply opening and the oxidizing gas supply opening can be suppressed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a burner according to an embodiment of the present disclosure cut in a vertical section. [Diagram 2] FIG. 2 is a front view of a burner according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view taken along the line BB in FIG. 2. [Diagram 5] FIG. 1 is a longitudinal cross-sectional view of a burner according to an embodiment of the present disclosure. [Figure 6]6 is a cross-sectional view taken along the line CC in FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view taken along the line DD in FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a burner, a boiler, and a burner operating method according to the present disclosure will be described with reference to the drawings.

[0011] The gas burner 100 according to this embodiment is applied to a combustion device such as a boiler, etc. The gas burner 100 injects fuel gas (for example, blast furnace gas, etc.) and combustion air into a furnace of the combustion device to form a flame. In the following description, the vertical direction is referred to as the Z-axis direction, the direction along the direction in which fuel is injected from the gas burner is referred to as the X-axis direction, and the direction perpendicular to the Z-axis direction and the X-axis direction is referred to as the Y-axis direction.

[0012] [Gas burner] First, the gas burner 100 will be described with reference to Figures 1 to 4. Note that, for convenience of illustration, a cleaning device is omitted in Figures 1 to 4. As shown in FIG. 1, the gas burner 100 has a burner nozzle 10 that blows fuel gas G and combustion air (oxidizing gas) A into the furnace 200, a fuel gas passage 13 that supplies the fuel gas G to the burner nozzle 10, and an air passage 14 that supplies the combustion air A to the burner nozzle 10.

[0013] As shown in Figures 2 to 4, the burner nozzle 10 has a plurality of fuel gas supply units 11 that supply fuel gas G to the furnace 200, a plurality of air supply units 12 that supply combustion air A to the furnace 200, and an igniter 15. The fuel gas supply unit 11 is a flow path that supplies the fuel gas G to the furnace 200, and has a fuel gas supply opening 11a formed at the downstream end. The air supply section 12 is a flow path that supplies the combustion air A to the furnace 200, and has an air supply opening 12a formed at the downstream end. The igniter 15 is a device that generates an ignition source (flame, electric spark, plasma, etc.) that ignites the fuel gas G.

[0014] The burner nozzle 10 has a plurality of openings (a fuel gas supply opening 11a formed at the downstream end of the fuel gas supply section 11 and an air supply opening 12a formed at the downstream end of the air supply section 12) that open to the furnace 200. The plurality of openings are partitioned into 16 sections by a ceiling wall 10a, a partition plate 10b extending along a horizontal plane, a plurality of partition plates 10c extending along a vertical plane, and a bottom surface portion 10d. The multiple openings are arranged side by side along a plane (a plane defined by the Y-axis direction and the Z-axis direction) that intersects with the fuel gas flow direction or the oxidizing gas flow direction (the X-axis direction). Fuel gas supply openings 11a and air supply openings 12a are alternately arranged in both the Y-axis direction and the Z-axis direction. Fuel gas G and combustion air A are introduced into the burner nozzle 10. The gas burner 100 shown in Fig. 2 is a riffle-type gas burner.

[0015] Fig. 3 shows a cross section taken along the AA cutting line in Fig. 2. The fuel gas supply units 11 shown in Fig. 3 are two fuel gas supply units 11 adjacent to each other in the Y-axis direction and adjacent to each other in the Z-axis direction as shown along the AA cutting line in Fig. 2. As shown in Fig. 3, in the burner nozzle 10, the downstream ends of the two fuel gas supply units 11 adjacent to each other in the Y-axis direction and the Z-axis direction are connected to the end of the fuel gas flow path 13 on the furnace 200 side. The two adjacent fuel gas supply units 11 communicate with each other inside the burner nozzle 10 via the fuel gas flow path 13.

[0016] Fig. 4 shows a cross section taken along the line BB in Fig. 2. The air supply units 12 shown in Fig. 4 are two air supply units 12 adjacent to each other in the Y-axis direction and adjacent to each other in the Z-axis direction as shown along the line BB in Fig. 2. As shown in Fig. 4, in the burner nozzle 10, the downstream ends of the two air supply units 12 adjacent to each other in the Y-axis direction and the Z-axis direction communicate with the end of the air flow path 14 on the furnace 200 side. The two adjacent air supply openings 12a communicate with each other through the air flow path 14 inside the burner nozzle 10.

[0017] The fuel gas G flowing through the fuel gas passage 13 is supplied to the furnace 200 via a fuel gas supply unit 11. The combustion air A flowing through the air passage 14 is supplied to the furnace 200 via an air supply unit 12.

[0018] [Cleaning device] Next, the cleaning device (purge fluid ejection unit) 20 provided in the gas burner 100 will be described with reference to FIGS. The gas burner 100 according to this embodiment is provided with a cleaning device 20 for removing deposits accumulated inside the burner nozzle 10 .

[0019] The cleaning device 20 has a plurality of steam injection pipes 21 that inject steam (purge fluid), a connection pipe 22 that connects the steam injection pipes 21 to each other, and a steam supply pipe 23 that supplies steam to the steam injection pipes 21.

[0020] As shown in Fig. 7, four steam injection pipes 21 are provided. The four steam injection pipes 21 are arranged side by side at a predetermined interval in the Z-axis direction. Of the four steam injection pipes 21, two are arranged above the partition plate 10c, and the remaining two are arranged below the partition plate 10c. Note that the igniter 15 is not shown in Fig. 7.

[0021] Each steam injection pipe 21 extends in the Y-axis direction. The four steam injection pipes 21 include two first injection pipes 26 that inject steam into the air supply unit 12 and two second injection pipes 27 that inject steam into the fuel gas supply unit 11.

[0022] The two first injection pipes 26 are disposed at the top and bottom stages. As shown in Fig. 5, the first injection pipes 26 are disposed in the air flow path 14. In detail, the first injection pipe 26 provided at the top stage is disposed in the air flow path 14 provided above the fuel gas flow path 13 in the Z-axis direction. The first injection pipe 26 provided at the bottom stage is disposed in the air flow path 14 provided below the fuel gas flow path 13 in the Z-axis direction.

[0023] As shown in Fig. 7, a plurality of first injection holes 26a are formed on the side surface of the first injection pipe 26 facing the furnace 200. Steam flowing through the first injection pipe 26 is injected from the plurality of first injection holes 26a. The plurality of first injection holes 26a are arranged in a line along the Y-axis direction at predetermined intervals. Each of the first injection holes 26a is arranged so as to overlap with the air supply unit 12 (the position where the air supply unit 12 is formed in the Y-axis direction) when viewed from the X-axis direction (the fuel gas flow direction).

[0024] As shown in Fig. 5, each of the first injection holes 26a injects steam toward the air supply opening 12a. Specifically, each of the first injection holes 26a injects steam obliquely downward toward the lower end of the air supply opening 12a. Specifically, each of the first injection holes 26a provided in the first injection pipe 26 provided above the partition plate 10c injects steam toward the partition plate 10c in the vicinity of the air supply opening 12a. Also, each of the first injection holes 26a provided in the first injection pipe 26 provided below the partition plate 10c injects steam toward the bottom surface portion 10d in the vicinity of the air supply opening 12a.

[0025] The two second injection pipes 27 are disposed so as to be sandwiched between the two first injection pipes 26. In addition, both of the two second injection pipes 27 are disposed in the fuel gas flow path 13.

[0026] As shown in Fig. 7, a plurality of second injection holes 27a are formed on the side surface of the second injection pipe 27 facing the furnace 200. Steam flowing through the second injection pipe 27 is injected from the plurality of second injection holes 27a. The plurality of second injection holes 27a are arranged in a line along the Y-axis direction at predetermined intervals. Each of the second injection holes 27a is arranged so as to overlap with the fuel gas supply unit 11 (the position where the fuel gas supply unit 11 is formed in the Y-axis direction) when viewed from the X-axis direction (the oxidizing gas flow direction).

[0027] As shown in FIG. 5, each of the second injection holes 27a injects steam toward the fuel gas supply opening 11a. Specifically, each of the second injection holes 27a injects steam obliquely downward toward the lower end of the fuel gas supply opening 11a. Specifically, each of the second injection holes 27a provided in the second injection pipe 27 provided above the partition plate 10c injects steam toward the partition plate 10c, which is the lower end near the fuel gas supply opening 11a. Also, each of the second injection holes 27a provided in the second injection pipe 27 provided below the partition plate 10c injects steam toward the bottom surface portion 10d, which is the lower end near the fuel gas supply opening 11a.

[0028] 5 to 7, the connection pipes 22 connect the steam injection pipes 21 adjacent to each other in the vertical direction. Each connection pipe 22 extends in the Z-axis direction. Each connection pipe 22 is disposed so as to be shifted in the Y-axis direction. Two first injection pipes 26 provided in the air flow path 14 and two second injection pipes 27 provided in the fuel gas flow path 13 are connected to communicate with each other so that purge gas can flow.

[0029] 5 and 6, the steam supply pipe 23 integrally includes a first pipe 23a penetrating the sidewall surface of the fuel gas flow path 13 and extending in the Y-axis direction, and a second pipe 23b bending at a substantially right angle from the downstream end of the first pipe 23a (in terms of the gas flow in the steam supply pipe 23) in the X-axis direction and extending along the X-axis direction. The downstream end of the second pipe 23b (in terms of the gas flow in the steam supply pipe 23) is connected to the connection pipe 22. The steam supply pipe 23 is provided inside the fuel gas flow path 13.

[0030] Next, a method of operating the cleaning device 20 and a flow of steam ejected from the cleaning device 20 will be described. First, the gas burner 100 is visually inspected through a peephole provided in the furnace wall of the boiler, etc., to confirm the state of deposits (ash, etc.) inside the burner nozzle 10 (specifically, the partition plate 10c and bottom surface portion 10d). If it is determined that the deposits have accumulated to the extent that they need to be removed, the cleaning device 20 is operated to remove the deposits. Note that cleaning with the cleaning device 20 is performed when the gas burner 100 is not ignited. In other words, it is performed while the gas burner 100 is stopped.

[0031] When the cleaning device 20 is operated, steam is supplied to the first injection pipe 26 and the second injection pipe 27 through the steam supply pipe 23 and the connection pipe 22. The steam supplied to the first injection pipe 26 is injected from a plurality of first injection holes 26a formed in the first injection pipe 26. The injected steam S blows away deposits accumulated on the partition plate 10c and the bottom surface portion 10d toward the furnace 200. Moreover, the steam supplied to the second injection pipe 27 is injected from a plurality of second injection holes 27a formed in the second injection pipe 27. The injected steam S blows away deposits accumulated on the partition plate 10c and the bottom surface portion 10d toward the furnace 200.

[0032] At this time, the steam S is injected from all of the first injection holes 26a and the second injection holes 27a substantially simultaneously. As a result, the steam S is supplied to all of the fuel gas supply units 11 and the air supply units 12.

[0033] In this manner, deposits that have accumulated inside the burner nozzle 10 are removed from the inside of the burner nozzle 10.

[0034] According to this embodiment, the following advantageous effects are obtained. In this embodiment, the cleaning device 20 includes a first injection hole 26a for injecting steam S toward the fuel gas supply opening 11a and a second injection hole 27a for injecting steam S toward the air supply opening 12a. This allows the steam S to blow away deposits (e.g., ash, etc.) that accumulate near the fuel gas supply opening 11a and the air supply opening 12a, so that the deposits that accumulate near the fuel gas supply opening 11a and the air supply opening 12a can be removed. This makes it possible to prevent the fuel gas supply opening 11a and the air supply opening 12a from being blocked by the deposits.

[0035] Since the blockage of the fuel gas supply opening 11a and the air supply opening 12a can be suppressed, cooling air can be circulated through the fuel gas supply opening 11a and the air supply opening 12a. Therefore, the burner nozzle 10 can be suitably cooled, and thermal damage to the burner nozzle 10 can be suppressed. Furthermore, since blocking of the fuel gas supply opening 11a and the air supply opening 12a can be suppressed, ignition performance and flame stability performance at the time of ignition can be improved.

[0036] In addition, because the deposits are removed by the cleaning device 20, the cleaning work can be simplified compared to when workers clean the deposits with cleaning tools, etc. Also, because cleaning can be simplified, the frequency of cleaning can be increased. This allows the deposits to be removed before they harden, which also simplifies the cleaning work.

[0037] In this embodiment, steam (purge fluid) is supplied to the first injection pipe 26 and the second injection pipe 27 through the steam supply pipe 23 and the connection pipe 22, and the steam S is injected from the first injection hole 26a and the second injection hole 27a at the same time. This makes it possible to simultaneously blow away deposits that have accumulated near the fuel gas supply opening 11a and deposits that have accumulated near the air supply opening 12a. This makes it possible to prevent deposits that have been blown away from the vicinity of either the fuel gas supply opening 11a or the air supply opening 12a from being sucked into the other opening and being deposited again near the opening. This makes it possible to more preferably remove deposits that have accumulated near the fuel gas supply opening 11a and the air supply opening 12a. This makes it possible to more preferably prevent blockage of the fuel gas supply opening 11a and the air supply opening 12a due to adhesion of deposits.

[0038] In this embodiment, the first injection hole 26a injects the steam S toward the lower end of the fuel gas supply opening 11a. The second injection hole 27a injects the steam S toward the lower end of the air supply opening 12a. This makes it possible to more effectively remove deposits that accumulate near the fuel gas supply opening 11a and the air supply opening 12a. This makes it possible to more effectively prevent the fuel gas supply opening 11a and the air supply opening 12a from being blocked by the deposits.

[0039] In this embodiment, the first injection hole 26a is provided so as to overlap the fuel gas supply opening 11a when viewed from the fuel gas flow direction. The second injection hole 27a is provided so as to overlap the air supply opening 12a when viewed from the oxidizing gas flow direction. This allows the deposits accumulated near the fuel gas supply opening 11a and the air supply opening 12a to be blown away simply by injecting steam S from each injection hole. Therefore, the deposits accumulated near the fuel gas supply opening 11a and the air supply opening 12a can be more preferably removed. Therefore, the blockage of the fuel gas supply opening 11a and the air supply opening 12a due to the adhesion of the deposits can be suppressed.

[0040] In this embodiment, the fuel gas supply opening 11a and the air supply opening 12a are arranged alternately along a plane intersecting the fuel gas flow or oxidizing gas flow direction. In such a burner, deposits tend to accumulate near the fuel gas supply opening 11a and the air supply opening 12a, but since the present embodiment is provided with the cleaning device 20, even in such a burner, the deposits accumulated near the fuel gas supply opening 11a and the air supply opening 12a can be suitably removed. Therefore, the blockage of the fuel gas supply opening 11a and the air supply opening 12a due to the adhesion of deposits can be suppressed.

[0041] The present disclosure is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present disclosure. For example, in the above embodiment, an example has been described in which steam is injected from one first injection hole 26a to one fuel gas supply unit 11, but the present disclosure is not limited to this. For example, steam may be injected from multiple first injection holes 26a to one fuel gas supply unit 11. Similarly, steam may be injected from multiple second injection holes 27a to one air supply unit 12.

[0042] In the above embodiment, an example in which steam is sprayed from the cleaning device 20 has been described, but the present disclosure is not limited thereto. For example, other gases (e.g., air, nitrogen, etc.) may be sprayed from the cleaning device 20. Also, liquids (e.g., water) may be sprayed from the cleaning device 20.

[0043] In the above embodiment, an example has been described in which the deposits are visually confirmed and then removed by the cleaning device 20, but the present disclosure is not limited to this. For example, the deposits may be removed by automatically spraying steam S from the cleaning device 20 at predetermined time intervals.

[0044] The combustion device may be provided with a burner other than the gas burner 100. One example of the other burner is a pulverized coal burner that uses pulverized coal as fuel. When a pulverized coal burner is provided in addition to the gas burner 100, ash derived from the ash content in the coal is added, and the amount of ash generated increases, so that deposits tend to accumulate on the burner nozzle 10. For this reason, the cleaning device 20 of the present disclosure can be applied to suitably remove the deposits.

[0045] The burner, the boiler, and the burner operating method described in the above-described embodiment can be understood, for example, as follows. The burner according to the first aspect of the present disclosure includes a burner nozzle having a fuel gas supply opening (11a) that opens into a furnace (200) and supplies a fuel gas to the furnace (200), and an oxidizing gas supply opening (12a) that opens into the furnace (200) and supplies an oxidizing gas to the furnace (200), a first injection section (26) that injects a purge fluid from the upstream side in the fuel gas flow toward the fuel gas supply opening (11a), and a second injection section (27) that injects a purge fluid from the upstream side in the oxidizing gas flow toward the oxidizing gas supply opening (12a), and is equipped with a purge fluid injection section (20) that injects purge fluid from the first injection section (26) and the second injection section (27) simultaneously.

[0046] In the above configuration, a purge fluid injection unit is provided, which has a first injection unit that injects purge fluid toward the fuel gas supply port and a second injection unit that injects purge fluid toward the oxidizing gas supply port. This allows the purge fluid to blow away deposits (e.g., ash, etc.) that accumulate near the fuel gas supply port and the oxidizing gas supply port, so that the deposits that accumulate near the fuel gas supply port and the oxidizing gas supply port can be removed. Therefore, clogging of the fuel gas supply port and the oxidizing gas supply port due to adhesion of deposits can be suppressed.

[0047] In addition, in the above configuration, the purge fluid is simultaneously injected from the first injection part and the second injection part. This allows the deposits deposited near the fuel gas supply port and the deposits deposited near the oxidizing gas supply port to be blown off at the same time. Therefore, it is possible to prevent the deposits blown off from the vicinity of either the fuel gas supply port or the oxidizing gas supply port from being sucked into the other opening and being deposited again near the opening. Therefore, it is possible to more preferably remove the deposits deposited near the fuel gas supply port and the oxidizing gas supply port. Therefore, it is possible to more preferably prevent the fuel gas supply port and the oxidizing gas supply port from being blocked by the deposits.

[0048] In addition, in the burner according to a second aspect of the present disclosure, in the above-mentioned first aspect, the first injection part (26) injects purge fluid toward a lower end of the fuel gas supply opening (11a), and the second injection part (27) injects purge fluid toward a lower end of the oxidizing gas supply opening (12a).

[0049] In the above configuration, the first injection unit injects the purge fluid toward the lower end of the fuel gas supply port. The second injection unit injects the purge fluid toward the lower end of the oxidizing gas supply port. This makes it possible to more effectively remove deposits that accumulate near the fuel gas supply port and the oxidizing gas supply port. This makes it possible to more effectively prevent the fuel gas supply port and the oxidizing gas supply port from being blocked by deposits.

[0050] Furthermore, in a burner according to a third aspect of the present disclosure, in the above first or second aspect, the purge fluid injection section (20) has a purge fluid piping (21) through which a purge fluid flows, the first injection section (26) has a first injection hole (26a) formed in a side surface of the purge fluid piping (21), the second injection section (27) has a second injection hole (27a) formed in a side surface of the purge fluid piping (21), the first injection hole (26a) is arranged so as to overlap with the fuel gas supply opening (11a) when viewed from the fuel gas flow direction, and the second injection hole (27a) is arranged so as to overlap with the oxidizing gas supply opening (12a) when viewed from the oxidizing gas flow direction.

[0051] In the above configuration, the first injection hole is provided so as to overlap with the fuel gas supply port when viewed from the fuel gas flow direction. Also, the second injection hole is provided so as to overlap with the oxidizing gas supply port when viewed from the oxidizing gas flow direction. This makes it possible to blow away deposits that accumulate near the fuel gas supply port and the oxidizing gas supply port simply by injecting purge fluid from each injection hole. Therefore, it is possible to more suitably remove deposits that accumulate near the fuel gas supply port and the oxidizing gas supply port. Therefore, it is possible to suppress clogging of the fuel gas supply port and the oxidizing gas supply port due to adhesion of deposits.

[0052] Furthermore, a burner according to a fourth aspect of the present disclosure is, in any one of the first to third aspects above, such that a plurality of fuel gas supply openings (11a) are formed in the burner nozzle, a plurality of oxidizing gas supply openings (12a) are formed in the burner nozzle, and the fuel gas supply openings (11a) and the oxidizing gas supply openings (12a) are arranged alternately along a plane intersecting the fuel gas flow direction or the oxidizing gas flow direction.

[0053] In the above configuration, the fuel gas supply port and the oxidizing gas supply port are arranged alternately along a plane intersecting the fuel gas flow. In such a burner, deposits are likely to accumulate near the fuel gas supply port and the oxidizing gas supply port, but since the above configuration is equipped with a purge fluid injection unit, even in such a burner, deposits that accumulate near the fuel gas supply port and the oxidizing gas supply port can be suitably removed. Therefore, clogging of the fuel gas supply port and the oxidizing gas supply port due to adhesion of deposits can be suppressed.

[0054] In addition, a boiler according to a fifth aspect of the present disclosure, in any of the first to fourth aspects above, includes an oxidizing gas flow path (14) through which an oxidizing gas flows to supply the oxidizing gas to the oxidizing gas supply opening (12a), and a fuel gas flow path (13) through which a fuel gas flows to supply the fuel gas to the fuel gas supply opening (11a), wherein the first injection distribution part (26) is provided in the oxidizing gas flow path and the second injection part (27) is provided in the fuel gas flow path, and the first injection distribution part and the second injection part are connected by a connection pipe (22).

[0055] In the above configuration, the first and second injectors are connected by a connection pipe, which makes it easier to simultaneously inject the purge fluid from the first and second injectors.

[0056] A boiler according to a first aspect of the present disclosure includes the burner according to any one of the first to fifth aspects.

[0057] In a first aspect of the present disclosure, the burner operating method comprises a burner nozzle in which a fuel gas supply opening (11a) opening into a furnace (200) for supplying a fuel gas to the furnace (200) and an oxidizing gas supply opening (12a) opening into the furnace (200) for supplying an oxidizing gas to the furnace (200) are formed, and a purge fluid injection unit (20) having a first injection section (26) for injecting a purge fluid from the upstream side in a fuel gas flow toward the fuel gas supply opening (11a) and a second injection section (27) for injecting a purge fluid from the upstream side in an oxidizing gas flow toward the oxidizing gas supply opening (12a), and comprises an injection step of simultaneously injecting purge fluid from the first injection section (26) and the second injection section (27). [Explanation of symbols]

[0058] 10: Burner nozzle 10a: Ceiling wall 10b: Partition plate 10c: Partition plate 10d: Bottom part 11: Fuel gas supply section 11a: Fuel gas supply opening 12: Air supply section 12a: Air supply opening (oxidizing gas supply opening) 13: Fuel gas flow path 14: Air flow path 15: Igniter 20: Cleaning device (purge fluid injection part) 21: Steam injection pipe 22: Connection pipe 23: Steam supply pipe 23a: 1st piping 23b: 2nd piping 26: 1st injection pipe 26a: 1st injection hole 27:Second injection pipe 27a: 2nd injection hole 100: Gas burner 200: Furnace A: Combustion air G: Fuel gas S: Steam

Claims

1. a burner nozzle having a fuel gas supply opening that opens into a furnace and supplies a fuel gas to the furnace, and an oxidizing gas supply opening that opens into the furnace and supplies an oxidizing gas to the furnace; A burner comprising: a first injection section that injects purge fluid from the upstream side in the fuel gas flow toward the fuel gas supply opening; and a second injection section that injects purge fluid from the upstream side in the oxidizing gas flow toward the oxidizing gas supply opening, and a purge fluid injection section that injects purge fluid simultaneously from the first injection section and the second injection section.

2. The first injection section injects a purge fluid toward a lower end of the fuel gas supply opening, The burner according to claim 1 , wherein the second injector injects purge fluid toward a lower end of the oxidizing gas supply opening.

3. The purge fluid injection unit has a purge fluid pipe through which the purge fluid flows, The first injection portion has a first injection hole formed in a side surface of the purge fluid pipe, The second injection portion has a second injection hole formed in a side surface of the purge fluid pipe, the first injection hole is provided so as to overlap with the fuel gas supply opening when viewed from the fuel gas flow direction, The burner according to claim 1 , wherein the second injection hole is provided so as to overlap with the oxidizing gas supply opening when viewed from the oxidizing gas flow direction.

4. A plurality of the fuel gas supply openings are formed in the burner nozzle, A plurality of the oxidizing gas supply openings are formed in the burner nozzle, 2. The burner according to claim 1, wherein the fuel gas supply openings and the oxidizing gas supply openings are arranged alternately along a plane intersecting the fuel gas flow direction or the oxidizing gas flow direction.

5. an oxidizing gas flow path through which an oxidizing gas flows and which supplies the oxidizing gas to the oxidizing gas supply opening; a fuel gas flow path through which a fuel gas flows to supply the fuel gas to the fuel gas supply opening, The first injection portion is provided in the oxidizing gas flow path, The second injection portion is provided in the fuel gas flow path, The burner according to claim 1 , wherein the first injection section and the second injection section are connected by a connecting pipe.

6. A boiler comprising a burner according to any one of claims 1 to 5.

7. 1. A method of operating a burner, comprising: The burner is a burner nozzle having a fuel gas supply opening that opens into a furnace and supplies a fuel gas to the furnace, and an oxidizing gas supply opening that opens into the furnace and supplies an oxidizing gas to the furnace; a purge fluid injection unit having a first injection unit that injects a purge fluid from an upstream side in a fuel gas flow toward the fuel gas supply opening, and a second injection unit that injects a purge fluid from an upstream side in an oxidizing gas flow toward the oxidizing gas supply opening, A burner operating method comprising an injection step of simultaneously injecting purge fluid from the first injection portion and the second injection portion.

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