Apparatus and method for confirming misalignment of fuel nozzle

Abstract

To provide a fuel nozzle misalignment confirmation device and a fuel nozzle misalignment confirmation method capable of confirming the presence or absence of misalignment of a plurality of fuel nozzles at a time.SOLUTION: A fuel nozzle misalignment checking apparatus for checking presence or absence of misalignment of a plurality of fuel nozzles in a gas turbine combustor including the plurality of fuel nozzles and a mixing hole plate in which a plurality of mixing holes for mixing fuel and combustion gas are formed, the fuel being injected from the fuel nozzles, the fuel nozzle misalignment checking apparatus including a measurement plate in which a plurality of gauge holes each having a diameter larger than a diameter of a tip of each of the fuel nozzles and smaller than a diameter of each of the mixing holes are formed on one surface.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a fuel nozzle misalignment checking device and a fuel nozzle misalignment checking method for checking misalignment of a fuel nozzle. [Background technology]

[0002] Some gas turbine combustors are configured to inject fuel from the tip of a fuel nozzle inserted into a mixing hole (mixing tube), and to introduce compressed air into the mixing hole through a gap between the outer surface of the fuel nozzle and the inner surface of the mixing hole (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-131352 Summary of the Invention [Problem to be solved by the invention]

[0004] The axial position of each mixing hole is set to the design axial position of the corresponding fuel nozzle. However, the actual axial position of the fuel nozzle may deviate from the design axial position of the fuel nozzle due to an assembly error of the fuel nozzle, etc. If the actual axial position of the fuel nozzle deviates significantly from the design axial position of the fuel nozzle, the fuel injected from the fuel nozzle may be unevenly distributed near the inner surface of the mixing hole, which may result in an increase in the fuel concentration near the inner surface of the mixing hole. If the fuel concentration near the inner surface of the mixing hole increases excessively, the possibility of a flashback phenomenon occurring within the mixing hole increases. For this reason, it is necessary to confirm whether the actual axial position of the fuel nozzle is within an allowable range with respect to the design axial position.

[0005] Here, it is conceivable to check for misalignment of the fuel nozzles using a gauge jig (see FIG. 4) that can be inserted into the mixing hole, but because the gauge jig needs to be inserted into the mixing hole corresponding to the fuel nozzle for which misalignment is to be checked, it is only possible to check for misalignment of one fuel nozzle at a time. Therefore, when there are multiple fuel nozzles for which misalignment is to be checked, the misalignment checking method using the gauge jig has the problem of being laborious and time-consuming.

[0006] In view of the above circumstances, at least one embodiment of the present disclosure aims to provide a fuel nozzle misalignment checking device and a fuel nozzle misalignment checking method that can check the presence or absence of misalignment of multiple fuel nozzles at once. [Means for solving the problem]

[0007] A fuel nozzle misalignment confirmation device according to at least one embodiment of the present disclosure includes: 1. A fuel nozzle misalignment checking device for checking whether or not there is misalignment of a plurality of fuel nozzles in a gas turbine combustor including: a plurality of fuel nozzles; and a mixing hole plate formed with a plurality of mixing holes through which fuel is injected from the fuel nozzles and which mix the fuel with a combustion gas, the fuel nozzle misalignment checking device comprising: The measurement plate has a plurality of gauge holes formed on one surface thereof, the gauge holes being respectively formed at the axial positions of the plurality of fuel nozzles, the gauge holes having a diameter larger than that of the tips of the fuel nozzles and smaller than that of the mixing holes.

[0008] A method for verifying fuel nozzle misalignment in accordance with at least one embodiment of the present disclosure includes: 1. A method for checking misalignment of fuel nozzles in a gas turbine combustor, the method comprising: a plurality of fuel nozzles; a nozzle support supporting the plurality of fuel nozzles; and a mixing hole plate having a plurality of mixing holes formed therein through which fuel is injected from the fuel nozzles and which mixes the fuel with a combustion gas, the method comprising: a plate arrangement step of covering the plurality of fuel nozzles with a measurement plate having a plurality of gauge holes formed on one surface thereof, the gauge holes being larger in diameter than the tips of the fuel nozzles and smaller in diameter than the mixing holes, respectively, formed at axial positions of the plurality of fuel nozzles; and a misalignment confirmation step of confirming whether or not the tip of the fuel nozzle is misaligned based on whether or not the tip of the fuel nozzle is inserted into the gauge hole. [Effects of the Invention]

[0009] According to at least one embodiment of the present disclosure, there is provided a fuel nozzle misalignment checking device and a fuel nozzle misalignment checking method that can check the presence or absence of misalignment of a plurality of fuel nozzles at once. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic configuration diagram of a gas turbine including a gas turbine combustor according to an embodiment of the present disclosure. [Figure 2] 1 is a schematic axial cross-sectional view of a gas turbine combustor according to an embodiment of the present disclosure; [Figure 3] FIG. 1 is a schematic axial cross-sectional view of a gas turbine combustor without a mixing hole plate installed according to an embodiment of the present disclosure. [Figure 4] FIG. 10 is an explanatory diagram for explaining a fuel nozzle misalignment checking method according to a comparative example. [Figure 5] 1 is a schematic cross-sectional view taken along the axial direction of a gas turbine combustor to which a fuel nozzle misalignment checking device according to an embodiment of the present disclosure is attached; [Figure 6] FIG. 2 is an explanatory diagram for explaining a method for checking misalignment of a fuel nozzle according to an embodiment of the present disclosure. [Figure 7] 1 is a schematic view of a fuel nozzle misalignment checking device according to an embodiment of the present disclosure, viewed from one axial side; FIG. [Figure 8] 6 is a schematic cross-sectional view of the fuel nozzle misalignment checking device according to the embodiment of the present disclosure, taken along the line AB shown in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure.

[0012] (Gas Turbine) FIG. 1 is a schematic configuration diagram of a gas turbine 100 including a gas turbine combustor 2 according to an embodiment of the present disclosure. A fuel nozzle misalignment checking device 1 according to some embodiments is a device for checking whether or not there is misalignment among a plurality of fuel nozzles 3 included in the gas turbine combustor 2. A fuel nozzle misalignment checking method according to some embodiments is a method for checking whether or not there is misalignment among a plurality of fuel nozzles 3 included in the gas turbine combustor 2. As shown in FIG. 1 , the gas turbine 100 includes the gas turbine combustor 2 described above, a compressor 101 configured to compress a combustion gas, and a turbine 102 configured to be driven by the combustion gas from the gas turbine combustor 2. The combustion gas (e.g., compressed air) compressed by the compressor 101 is guided to the gas turbine combustor 2.

[0013] (Gas turbine combustor) Fig. 2 is a schematic sectional view taken along the axial direction of a gas turbine combustor 2 according to an embodiment of the present disclosure. Fig. 3 is a schematic sectional view taken along the axial direction of a gas turbine combustor 2 to which a mixing hole plate 5 according to an embodiment of the present disclosure is not attached. Fig. 4 is an explanatory diagram for describing a fuel nozzle misalignment checking method according to a comparative example. As shown in Fig. 2, the gas turbine combustor 2 includes a plurality of fuel nozzles 3, a nozzle support 4 that supports the plurality of fuel nozzles 3, and a mixing hole plate 5.

[0014] Hereinafter, an extension direction of a central axis CA1 of the gas turbine combustor 2 (nozzle support 4) will be referred to as an axial direction of the gas turbine combustor 2 (nozzle support 4), a direction perpendicular to the central axis CA1 will be referred to as a radial direction of the gas turbine combustor 2 (nozzle support 4), and a circumferential direction about the central axis CA1 will be referred to as a circumferential direction of the gas turbine combustor 2 (nozzle support 4). The axial direction of the gas turbine combustor 2 will sometimes be simply referred to as the axial direction, the radial direction of the gas turbine combustor 2 will sometimes be simply referred to as the radial direction, and the circumferential direction of the gas turbine combustor 2 will sometimes be simply referred to as the circumferential direction.

[0015] (Fuel nozzle, nozzle support) 2 and 3, each of the plurality of fuel nozzles 3 extends along the axial direction of the gas turbine combustor 2. An end face on one axial side (the right side in the drawings) of each of the plurality of fuel nozzles 3 is defined as a tip end 31. Each of the plurality of fuel nozzles 3 has a base end 32, which is an end on the other axial side (the left side in the drawings), supported by a nozzle support 4.

[0016] 2 and 3 , the one axial end face 41 of the nozzle support body 4 includes an inner circumferential end face 42, and an outer circumferential end face 43 provided outward in the radial direction of the gas turbine combustor 2 from the inner circumferential end face 42 and on the other axial side from the inner circumferential end face 42. A base end portion 32 of each of the plurality of fuel nozzles 3 is supported by the nozzle support body 4 at a position radially inward from the outer circumferential edge of the inner circumferential end face 42. The one axial end portion of each of the plurality of fuel nozzles 3 protrudes toward the one axial side beyond the inner circumferential end face 42.

[0017] The multiple fuel nozzles 3 do not have to be at uniform axial distances from the inner peripheral end face 42 of the tip 31. In the illustrated embodiment, each of the multiple fuel nozzles 3 belongs to either a first fuel nozzle group consisting of multiple fuel nozzles 3A whose axial length from the inner peripheral end face 42 of the tip 31 is a predetermined first length, or a second fuel nozzle group consisting of multiple fuel nozzles 3B whose axial length from the inner peripheral end face 42 of the tip 31 is a predetermined second length that is longer than the first length.

[0018] 4 and 6, the symbol CA2 indicates the central axis of the fuel nozzle 3, and the axis of the fuel nozzle 3 is located on this central axis. The symbol CA3 in FIG. 4 indicates the central axis of the mixing hole 51, and the axis of the mixing hole 51 is located on this central axis. The symbol CA4 in FIG. 6 indicates the central axis of the gauge hole 61, and the axis of the gauge hole 61 is located on this central axis. The symbol FL1 in FIG. 4 indicates the flow of fuel, and the symbol FL2 in FIG. 4 indicates the flow of combustion gas.

[0019] As shown in Fig. 4 , each of the fuel nozzles 3 is formed in a cylindrical shape extending along the axial direction of the gas turbine combustor 2 and has an outer surface 33 and an inner surface 34 that forms a fuel-side flow passage FC1 through which fuel can flow. In the illustrated embodiment, each of the fuel nozzles 3 is formed in a cylindrical shape extending along the axial direction of the gas turbine combustor 2, and each of the outer surface 33 and the inner surface 34 is formed in a circular shape. In each of the fuel nozzles 3, fuel is guided from a base end 32 side to a fuel-side flow passage FC1 formed inside the fuel nozzle 3 and is discharged to the outside of the fuel nozzle 3 from an opening 311 formed at the tip 31, i.e., from the downstream end of the fuel-side flow passage FC1. The fuel for the gas turbine combustor 2 may be a liquid fuel such as kerosene or diesel, or a gas fuel such as natural gas.

[0020] (Mixing hole plate) 2, the mixing hole plate 5 includes a plate-shaped main body portion 54 in which a plurality of mixing holes 51 are formed, penetrating from one surface 52 to the other surface 53 of the mixing hole plate 5. The one surface 52 is an end surface on one side in the thickness direction of the main body portion 54, and the other surface 53 is an end surface on the other side of the main body portion. The main body portion 54 of the mixing hole plate 5 extends along a direction intersecting (perpendicular to) the axial direction of the gas turbine combustor 2, and the one surface 52 is disposed so as to face the inner peripheral end face 42 with an axial gap therebetween.

[0021] Each of the multiple mixing holes 51 is configured so that fuel is injected from the fuel nozzle 3 and mixes the fuel with the combustion gas. Specifically, each of the multiple fuel nozzles 3 corresponds to a respective one of the multiple mixing holes 51. A portion of the end portion on one axial side, including the tip 31, of each of the multiple fuel nozzles 3 is inserted into the mixing hole 51 corresponding to that fuel nozzle 3 from the one surface 52 side. Hereinafter, the portion of the end portion on one axial side of the fuel nozzle 3 that is inserted into the mixing hole 51 is defined as an insertion portion.

[0022] The inner surface 511 of each of the multiple mixing holes 51 has a diameter larger than the outer surface 33 of the insertion portion of the fuel nozzle 3 to which the mixing hole 51 corresponds, and a gap is formed between the outer surface 33 and the inner surface 511 to serve as a combustion gas flow path FC2 through which the combustion gas can flow. The combustion gas is introduced into the combustion gas flow path FC2 from the other axial side. The combustion gas is compressed gas (e.g., compressed air) compressed by a compressor.

[0023] The inner surfaces 511 of the respective mixing holes 51 form a fuel gas side flow passage FC3, through which fuel gas, a mixture of fuel and combustion gas, can flow, on the other axial side of the tip 31 of the fuel nozzle 3 to which the mixing hole 51 corresponds. The fuel gas side flow passage FC3 communicates with both the fuel side flow passage FC1 and the combustion gas side flow passage FC2, and the fuel introduced from the fuel side flow passage FC1 and the combustion gas introduced from the combustion gas side flow passage FC2 flow into the fuel gas side flow passage FC3. The fuel and combustion gas are mixed in the fuel gas side flow passage FC3.

[0024] In the embodiment shown in FIG. 2 , the mixing hole plate 5 includes a fixing portion 55 that is detachably fixed to the nozzle support 4, and a connecting portion 56 that connects the main body portion 54 and the fixing portion 55. The fixing portion 55 is an arc-shaped member or annular member (annular member in the illustrated example) that extends along the circumferential direction. The fixing portion 55 is detachably fastened to the nozzle support 4 via fastening members 12 such as bolts and nuts, with one end face in the thickness direction of the fixing portion 55 abutting against the outer peripheral end face 43. The connecting portion 56 is a cylindrical body, and one axial end portion is connected to one surface 52 of the main body portion 54 and the other axial end portion is connected to the other end face in the thickness direction of the fixing portion 55.

[0025] Each of the multiple mixing holes 51 has an axial position that is set to the design axial position of the corresponding fuel nozzle 3. The actual axial position of the fuel nozzle 3 supported by the nozzle support 4 may deviate from the design axial position of the fuel nozzle 3 due to an assembly error of the fuel nozzle 3 relative to the nozzle support 4, etc. If the actual axial position of the fuel nozzle 3 deviates significantly from the design axial position of the fuel nozzle 3, the fuel injected from the fuel nozzle 3 may be unevenly distributed near the inner surface 511 of the mixing hole 51, which may result in an increase in the fuel concentration near the inner surface 511 of the mixing hole 51. If the fuel concentration near the inner surface 511 of the mixing hole 51 increases excessively, the possibility of a flashback phenomenon occurring within the mixing hole 51 increases. For this reason, it is necessary to confirm whether the actual axial position of the fuel nozzle 3 is within an allowable range with respect to the design axial position.

[0026] (Comparative Example of Fuel Nozzle Misalignment Checking Method) In the fuel nozzle misalignment checking method according to the comparative example, as shown in Fig. 2 , the presence or absence of misalignment of the multiple fuel nozzles 3 is checked using a cylindrical gauge jig 06 in a state in which a mixing hole plate 5 is attached to a nozzle support 4. The gauge jig 06 is insertable into the mixing hole 51. For example, the diameter of the outer surface 061 of the gauge jig 06 is set so that when inserted into the mixing hole 51, the amount of axial misalignment of the axis of the gauge jig 06 from the axis of the mixing hole 51 is equal to or less than a predetermined value.

[0027] The diameter of the inner surface 062 of the gauge jig 06 is a gauge diameter that takes into consideration the tolerance for misalignment of the axial position of the fuel nozzle 3 relative to the outer diameter of the tip 31 of the fuel nozzle 3. The gauge diameter has, for example, the size of the maximum intersection of the allowable amount of misalignment of the tip 31 of the fuel nozzle 3. When the gauge jig 06 is inserted into the mixing hole 51, if the tip 31 of the fuel nozzle 3 can be inserted into the inner surface 062 of the gauge jig 06, it can be determined that the amount of misalignment of the fuel nozzle 3 is within the allowable range and that no misalignment has occurred in the fuel nozzle 3. On the other hand, when the gauge jig 06 is inserted into the mixing hole 51, if the tip 31 of the fuel nozzle 3 cannot be inserted into the inner surface 062 of the gauge jig 06, it can be determined that the amount of misalignment of the fuel nozzle 3 is outside the allowable range and that there is misalignment in the fuel nozzle 3.

[0028] In the fuel nozzle misalignment checking method according to the comparative example, the gauge jig 06 needs to be inserted into the mixing hole 51 corresponding to the fuel nozzle 3 to be checked for misalignment, and therefore, the misalignment of one fuel nozzle 3 can be checked at a time. Therefore, in order to check for misalignment of multiple fuel nozzles 3, the misalignment checking method using the gauge jig 06 described above needs to be performed as many times as the number of fuel nozzles 3 to be checked for misalignment, which poses a problem of being laborious and time-consuming.

[0029] (Fuel nozzle misalignment detection device) FIG. 5 is a schematic cross-sectional view along the axial direction of a gas turbine combustor 2 to which a fuel nozzle misalignment confirmation device 1 according to an embodiment of the present disclosure is attached. FIG. 6 is an explanatory diagram for describing a fuel nozzle misalignment confirmation method according to an embodiment of the present disclosure. FIG. 7 is a schematic view of the fuel nozzle misalignment confirmation device 1 according to an embodiment of the present disclosure, viewed from one side in the axial direction. FIG. 8 is a schematic cross-sectional view of the fuel nozzle misalignment confirmation device 1 according to an embodiment of the present disclosure, taken along the arrows AB shown in FIG. 5. As shown in FIG. 5, the fuel nozzle misalignment confirmation device 1 according to some embodiments includes at least a measurement plate 6. In the embodiment shown in FIG. 5, the fuel nozzle misalignment confirmation device 1 further includes a base 7 configured to be detachably fixed to the nozzle support 4 and configured to detachably support the measurement plate 6.

[0030] (measurement plate) 5 , the measurement plate 6 is a plate-like member having one surface 62 in which a plurality of gauge holes 61 are formed, and another surface 63. The one surface 62 is an end surface on one side in the thickness direction of the measurement plate 6, and the other surface 63 is an end surface on the other side in the thickness direction of the measurement plate 6. The measurement plate 6 extends along a direction intersecting (perpendicular to) the axial direction of the gas turbine combustor 2, and is arranged so that the one surface 62 faces the inner peripheral end surface 42 with an axial gap therebetween.

[0031] The multiple gauge holes 61 are formed at the axial positions of the multiple fuel nozzles 3, respectively. Specifically, each of the multiple fuel nozzles 3 corresponds to one of the multiple gauge holes 61. Like each of the multiple mixing holes 51, each of the multiple gauge holes 61 is configured so that its axial center position is set at the designed axial center position of the corresponding fuel nozzle 3. For each of the multiple fuel nozzles 3, an insertion portion, which is a part of the end portion on one side in the axial direction including the tip 31, is inserted into the gauge hole 61 corresponding to the fuel nozzle 3 from the one surface 62 side.

[0032] Each of the multiple gauge holes 61 has a diameter larger than the tip 31 of the fuel nozzle 3 to which the gauge hole 61 corresponds, and a diameter smaller than the mixing hole 51 to which the fuel nozzle 3 corresponds. Similar to the diameter of the inner surface 062 of the gauge jig 06 described above, the diameter of the inner surface 611 of the gauge hole 61 is a gauge diameter that takes into consideration the tolerance for misalignment of the axial position of the fuel nozzle 3 relative to the outer diameter of the tip 31 of the fuel nozzle 3. The gauge diameter has, for example, the size of the maximum intersection of the allowable amount of misalignment of the tip 31 of the fuel nozzle 3.

[0033] In the fuel nozzle misalignment checking method according to some embodiments of the present disclosure, the presence or absence of misalignment of the plurality of fuel nozzles 3 is checked using a measurement plate 6 in a state in which the mixing hole plate 5 is not attached to the nozzle support 4 as shown in Fig. 3 , specifically, in a state before the mixing hole plate 5 is attached to the nozzle support 4. When the fuel nozzle misalignment checking method according to some embodiments of the present disclosure is performed, it is preferable that the gas turbine combustor 2 without the mixing hole plate 5 attached is arranged such that the axial direction of the gas turbine combustor 2 is aligned with the vertical direction and the tips 31 of the respective fuel nozzles 3 are positioned above the inner circumferential end face 42 as shown in Fig. 5 .

[0034] A method for checking fuel nozzle misalignment according to some embodiments of the present disclosure includes a plate positioning step and a misalignment checking step. In the plate positioning step, one surface 62 of a measurement plate 6 is placed over a plurality of fuel nozzles 3. Note that before the plate positioning step, the measurement plate 6 is positioned relative to the nozzle support 4, and the measurement plate 6 is appropriately positioned relative to the nozzle support 4. Here, "the measurement plate 6 is appropriately positioned relative to the nozzle support 4" means that the axis of each of the plurality of gauge holes 61 formed in the measurement plate 6 is aligned with the axis of the corresponding mixing hole 51 when the mixing hole plate 5 is attached to the nozzle support 4. Note that the amount of axial misalignment that may occur between the axis of each of the plurality of gauge holes 61 and the axis of the corresponding mixing hole 51 is smaller than the tolerance for misalignment of the axial center position of the fuel nozzle 3 and does not affect the determination of the presence or absence of misalignment of the fuel nozzle 3.

[0035] In the misalignment confirmation step, presence or absence of misalignment of the fuel nozzles 3 is confirmed based on whether the tips 31 of the fuel nozzles 3 are inserted into the gauge holes 61. When one surface 62 of the measurement plate 6 is placed over the plurality of fuel nozzles 3, if the tips 31 of all of the fuel nozzles 3 included in the gas turbine combustor 2 can be inserted into the corresponding gauge holes 61, it can be determined that the amount of misalignment of all of the fuel nozzles 3 included in the gas turbine combustor 2 is within a tolerable range and that no misalignment has occurred in any of the fuel nozzles 3 included in the gas turbine combustor 2. When one surface 62 of the measurement plate 6 is placed over the plurality of fuel nozzles 3, if the tip of at least one fuel nozzle 3 among all of the fuel nozzles 3 included in the gas turbine combustor 2 cannot be inserted into the corresponding gauge hole 61, it can be determined that the amount of misalignment of at least one fuel nozzle 3 among the fuel nozzles 3 that cannot be inserted into the gauge hole 61 is outside the tolerable range and that at least one fuel nozzle 3 has occurred.

[0036] By covering the fuel nozzles 3 with the measurement plate 6 having the plurality of gauge holes 61 formed therein, and checking whether the tip 31 of each of the fuel nozzles 3 is inserted into the gauge hole 61 corresponding to that fuel nozzle 3, it is possible to check at once whether each of the fuel nozzles 3 is misaligned.

[0037] In some embodiments of the fuel nozzle misalignment confirmation method, the plate arrangement step and the misalignment confirmation step are performed on each of a plurality of measurement plates 6 having different diameters (standard diameters) of the gauge holes 61. By performing the plate arrangement step and the misalignment confirmation step on each of a plurality of measurement plates 6 having different diameters (standard diameters) of the gauge holes 61, it is possible to determine the diameters of the gauge holes 61 into which a plurality of fuel nozzles 3 can be inserted, and thereby the degree of misalignment of the plurality of fuel nozzles 3 can be determined.

[0038] For example, a plurality of fuel nozzles 3 for which the judgment result for the gauge hole 61 having a first standard diameter is good and the judgment result for the gauge hole 61 having a second standard diameter that is smaller than the first standard diameter is bad have a larger degree of misalignment (amount of misalignment) than a plurality of fuel nozzles 3 for which the judgment result for the gauge hole 61 having the second standard diameter is good.

[0039] (Base) As shown in FIG. 5 , the base 7 of the fuel nozzle misalignment checking device 1 according to some embodiments includes a mounting portion 8, a fixing portion 9, and at least one leg portion 10. The mounting portion 8 has a mounting surface 81 on which the measurement plate 6 can be placed. The fixing portion 9 is configured to be detachably fixed to the nozzle support 4. In the illustrated embodiment, the at least one leg portion 10 includes a plurality of legs 10 (four in the example shown in FIG. 8 ) spaced apart in the circumferential direction.

[0040] (Placement section) The mounting portion 8 is an annular body having an inner surface 82 through which multiple fuel nozzles 3 can be inserted, and an outer surface 83. A recess 85 into which the above-mentioned measurement plate 6 can be fitted is formed on one end surface 84 of the mounting portion 8 in the thickness direction. The recess 85 is composed of the above-mentioned mounting surface 81, the inner periphery of which is continuous with the inner surface 82, and a wall surface 86 that stands upright from the outer periphery of the mounting surface 81. When the measurement plate 6 is fitted into the recess 85, the outer periphery of one surface 62 of the measurement plate 6 abuts against the mounting surface 81, and the wall surface 86 of the recess 85 surrounds the outer surface 64 of the measurement plate 6.

[0041] In the illustrated embodiment, as shown in Fig. 7, the outer surface 64 of the measurement plate 6, and the inner surface 82 and wall surface 86 of the mounting portion 8 are each formed in a circular shape. The outer surface 83 of the mounting portion 8 is formed in a polygonal shape (in the illustrated example, an octagonal shape). By making the outer surface 83 of the mounting portion 8 polygonal, it is possible to prevent the overall dimensions from increasing and to reduce the weight of the base 7 including the mounting portion 8. If the base 7 is lightweight, it becomes easier to attach and detach the base 7 to and from the nozzle support 4.

[0042] (Fixed part, leg part) The fixing portion 9 is an arc-shaped member or annular member (annular member in the illustrated example) extending along the circumferential direction. The fixing portion 9 is detachably fastened to the nozzle support 4 via fastening members 12 such as bolts and nuts, with an end face 91 on one side in the thickness direction of the fixing portion 9 abutting against the outer peripheral end face 43 described above. Each of the plurality of leg portions 10 described above connects the mounting portion 8 to the fixing portion 9 spaced apart from the mounting portion 8 in the axial direction. Specifically, one end of each of the plurality of leg portions 10 is connected to an end face 87 on the other side in the thickness direction of the mounting portion 8, and the other end of the leg portion 10 is connected to an end face 92 on the other side in the thickness direction of the fixing portion 9. In the illustrated embodiment, each of the plurality of leg portions 10 extends along the axial direction of the gas turbine combustor 2.

[0043] As shown in Fig. 8, the at least one leg portion 10 described above is configured to form a gap G in a portion of the circumferential direction between the mounting portion 8 and the fixed portion 9, i.e., in a circumferential range where no leg portion 10 is provided, that allows the inside to be seen from the outside in the radial direction. The proportion of the gap G in the circumferential direction is 50% or more, preferably 60% or more, and more preferably 80% or more. Note that the connecting portion 56 of the mixing hole plate 5 needs to separate the inside and outside of the mixing hole plate 5, and it is difficult to form the gap G that occupies a proportion of 50% or more in the circumferential direction.

[0044] The at least one leg 10 described above allows the mounting portion 8 to be supported by the fixed portion 9, and also allows a relatively wide gap G to be formed between the mounting portion 8 and the fixed portion 9 in a circumferential range where no leg 10 is provided. When installing the measurement plate 6 on the base 7, the worker can check the positional relationship between the fuel nozzle 3 and the gauge hole 61 in the measurement plate 6 corresponding to the fuel nozzle 3 not only from the tip 31 side of the fuel nozzle 3 (the one axial side) through the gauge hole 61, but also from directly to the side through the gap G (from a radially outer side of the gap G). Furthermore, by forming the gap G in the base 7, the weight of the base 7 can be reduced.

[0045] In the illustrated embodiment, a plurality of shaft portions 121, each having a thread formed on its outer surface, stand upright from the outer peripheral end face 43. The shaft portions 121 are spaced apart in the circumferential direction. The fixing portion 9 of the base 7 has a plurality of through holes 93 formed therein, one for each of the shaft portions 121. The fixing portion 9 is sandwiched between the nozzle support 4 and the nut member 122 by threading the nut member 122 onto the tip end portion of the fixing portion 9 that is inserted through the corresponding through holes 93 of the shaft portions 121.

[0046] Preferably, a plurality of through holes 551 corresponding one by one to each of the shaft portions 121 are also formed in fixing portion 55 of mixing hole plate 5. Fixing portion 55 is sandwiched between nozzle support body 4 and nut member 122 by screwing nut member 122 onto the tip portion that is inserted through corresponding through holes 551 of each of the shaft portions 121. In this case, fastening member 12 (plurality of shaft portions 121 and plurality of nut members 122) used when attaching base 7 to nozzle support body 4 can also be used when attaching mixing hole plate 5.

[0047] By placing the measurement plate 6 on the mounting surface 81 of the base 7 fixed to the nozzle support body 4, it becomes possible to use the measurement plate 6 to check whether or not each of the multiple fuel nozzles 3 is misaligned. By making the measurement plate 6 separate from the base 7, if some of the fuel nozzles 3 are significantly misaligned and adjustment of the axial positions of these fuel nozzles 3 is required, the adjustment can be performed by removing the measurement plate 6 from the base 7 while leaving the base 7 fixed to the nozzle support body 4. Furthermore, by making the measurement plate 6 separate from the base 7, the weight of the measurement plate 6 and the base 7 can be reduced, which makes it easier to use the measurement plate 6 to check whether or not each of the multiple fuel nozzles 3 is misaligned. Furthermore, it becomes easier to perform the plate arrangement step and the misalignment check step for each of multiple measurement plates 6 having gauge holes 61 with different diameters.

[0048] (Positioning the measurement plate relative to the base) In the fuel nozzle misalignment checking device 1 according to some embodiments, the mounting portion 8 has a wall surface 86 that surrounds the outer surface 64 of the measurement plate 6 when the measurement plate 6 is placed on the mounting surface 81, as shown in Fig. 5. The mounting portion 8 is provided on the mounting surface 81, as shown in Fig. 5, and has at least one second positioning fitting portion 88 that can fit with the first positioning fitting portion 65 provided on the measurement plate 6.

[0049] In the illustrated embodiment, the second positioning fitting portion 88 is a positioning pin (positioning protrusion) that stands upright from the mounting surface 81 and has a circular outer surface, and the first positioning fitting portion 65 is a positioning hole (positioning recess, in the illustrated example, a through hole) that has a circular inner surface and is formed on one surface 62 of the measurement plate 6. In some other embodiments, the second positioning fitting portion 88 may be a positioning hole (positioning recess), and the first positioning fitting portion 65 may be a positioning pin (positioning protrusion).

[0050] 7, the at least one second positioning fitting portion 88 includes a plurality of (two in the illustrated example) second positioning fitting portions 88 spaced apart in the circumferential direction. The first positioning fitting portions 65 are provided in the same number as the second positioning fitting portions 88, and in the illustrated example, are each spaced apart in the circumferential direction.

[0051] When the measurement plate 6 is placed on the mounting surface 81, the measurement plate 6 is fitted into a recess 85 formed by the mounting surface 81 and the wall surface 86, thereby restricting radial movement of the measurement plate 6 relative to the base 7 and the nozzle support body 4. When the measurement plate 6 is placed on the mounting surface 81, the first positioning fitting portion 65 provided on the measurement plate 6 is fitted into the second positioning fitting portion 88, thereby restricting circumferential and radial movement of the measurement plate 6 relative to the base 7 and the nozzle support body 4. According to the fuel nozzle misalignment checking device 1 described above, the positioning operation of the measurement plate 6 relative to the base 7 and the nozzle support body 4 when placing the measurement plate 6 on the mounting surface 81 becomes easy.

[0052] (Positioning of the nozzle support on the base) In the fuel nozzle misalignment checking device 1 according to some embodiments, the fixing portion 9 has an arc-shaped or annular (annular in the illustrated example) fitting protrusion 94 extending along the circumferential direction. As shown in FIG. 5 , the fitting protrusion 94 is configured to be able to fit into an arc-shaped or annular (annular in the illustrated example) fitting recess 44 provided along the circumferential direction in the nozzle support body 4. In the illustrated embodiment, the fitting protrusion 94 is provided on an end face 91 on one side in the thickness direction of the fixing portion 9 and protrudes from the other portion of the end face 91. The fitting recess 44 is provided on the outer peripheral end face 43 and is recessed from the other portion of the outer peripheral end face 43.

[0053] In addition, fixing portion 55 of mixing hole plate 5 is also provided with a fitting convex portion that can fit into fitting recess 44. In this case, fitting recess 44 that is used when attaching base 7 to nozzle support 4 can also be used when attaching mixing hole plate 5.

[0054] As shown in Figure 5, the above-mentioned fixing portion 9 has a surface that can abut against the outer peripheral end face 43, which is the end face of the nozzle support body 4, i.e., an end face 91 on one side in the thickness direction of the fixing portion 9, and has at least one fourth positioning fitting portion 95 that can fit with the third positioning fitting portion 45 provided on the outer peripheral end face 43.

[0055] In the illustrated embodiment, the third positioning fitting portion 45 is a positioning pin (positioning protrusion) that stands upright from the outer peripheral end face 43 and has a circular outer surface, and the fourth positioning fitting portion 95 is a positioning hole (positioning recess, in the illustrated example, a through hole) that has a circular inner surface and is formed in the end face 91 on one side in the thickness direction of the fixed portion 9. In some other embodiments, the third positioning fitting portion 45 may be a positioning hole (positioning recess), and the fourth positioning fitting portion 95 may be a positioning pin (positioning protrusion).

[0056] 8, the at least one fourth positioning fitting portion 95 includes a plurality of (two in the illustrated example) fourth positioning fitting portions 95 spaced apart in the circumferential direction. The third positioning fitting portions 45 are provided in the same number as the fourth positioning fitting portions 95, and in the illustrated example, are each spaced apart in the circumferential direction.

[0057] When the fixing portion 9 of the base 7 is attached to the nozzle support body 4, the fitting protrusion 94 of the fixing portion 9 is fitted into the fitting recess 44 provided in the nozzle support body 4, thereby restricting radial movement of the base 7 with respect to the nozzle support body 4. Then, when the fixing portion 9 of the base 7 is attached to the nozzle support body 4, the fourth positioning fitting portion 95 is fitted into the third positioning fitting portion 45, thereby restricting circumferential and radial movement of the base 7 with respect to the nozzle support body 4. According to the fuel nozzle misalignment checking device 1 described above, the positioning operation of the base 7 with respect to the nozzle support body 4 is facilitated when attaching the base 7 to the nozzle support body 4.

[0058] Note that fixing portion 55 of mixing hole plate 5 is also provided with at least one positioning fitting portion that can fit with third positioning fitting portion 45. In this case, third positioning fitting portion 45 that is used when attaching base 7 to nozzle support 4 can also be used when attaching mixing hole plate 5.

[0059] In the fuel nozzle misalignment checking device 1 according to some embodiments, as shown in Fig. 7, the measurement plate 6 has at least one lightening hole 66 penetrating the measurement plate 6, which is formed radially outward of the plurality of gauge holes 61. In the embodiment shown in Fig. 7, the at least one lightening hole 66 includes a plurality of (four in the illustrated example) lightening holes 66 formed at intervals in the circumferential direction. Each of the plurality of lightening holes 66 extends along the circumferential direction.

[0060] By providing the punching holes 66 in the measurement plate 6, the weight of the measurement plate 6 can be reduced. Since the measurement plate 6 can be gripped using the punching holes 66, it is easier for an operator to grasp the measurement plate 6, and the handling property of the measurement plate 6 can be improved. Thereby, the work of checking the presence or absence of misalignment of each of the plurality of fuel nozzles 3 by the measurement plate 6 becomes easy. Further, by providing the punching holes 66 in the measurement plate 6, when the measurement plate 6 is installed on the base 7, not only can the positional relationship between the fuel nozzle 3 and the gauge hole 61 of the measurement plate 6 corresponding to the fuel nozzle 3 be confirmed from the tip 31 side of the fuel nozzle 3 through the gauge hole 61, but also it can be confirmed from the side of the fuel nozzle 3 through the punching holes 66.

[0061] In the fuel nozzle misalignment confirmation device 1 according to some embodiments, as shown in FIG. 6, when the outer diameter of the tip 31 of the above-described fuel nozzle 3 is defined as D1 and the inner diameter of the gauge hole 61 corresponding to the fuel nozzle 3 is defined as D2, the inner diameter D2 of the gauge hole 61 satisfies the condition of D1 < D2 ≦ 1.25 × D1. When the inner diameter D2 of the gauge hole 61 satisfies the condition of D2 ≦ 1.25 × D1, if each of the plurality of fuel nozzles 3 can be inserted into the corresponding gauge hole 61, since the amount of misalignment of each of the plurality of fuel nozzles 3 is relatively small, an increase in the fuel concentration near the inner surface 511 of the mixing hole 51 can be effectively suppressed.

[0062] In this specification, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only strictly represent such arrangements, but also represent a state of being relatively displaced with tolerances, or at an angle or distance that can obtain the same function. For example, expressions representing that things such as "identical", "equal", and "homogeneous" are in an equal state not only strictly represent an equal state, but also represent a state in which there are tolerances or differences that can obtain the same function. Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. Furthermore, in this specification, the expressions "comprise," "include," or "have" a component are not exclusive expressions that exclude the presence of other components.

[0063] The present disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications.

[0064] The contents of the above-described embodiments can be understood, for example, as follows.

[0065] 1) A fuel nozzle misalignment checking device (1) according to at least one embodiment of the present disclosure includes: A fuel nozzle misalignment confirmation device (1) for confirming the presence or absence of misalignment of a plurality of fuel nozzles (3) in a gas turbine combustor (2) including a plurality of fuel nozzles (3) and a mixing hole plate (5) having a plurality of mixing holes (51) formed therein through which fuel is injected from the fuel nozzles (3) and which mixes the fuel with a combustion gas, comprising: The measurement plate (6) has a surface (62) on which a plurality of gauge holes (61) are formed, respectively at the axial positions of the plurality of fuel nozzles (3), the gauge holes (61) having diameters larger than the tips (31) of the fuel nozzles (3) and smaller than the diameter of the mixing holes (51).

[0066] According to the above configuration 1), the measurement plate (6) having the plurality of gauge holes (61) formed therein is placed over the plurality of fuel nozzles (3), and it is possible to simultaneously check whether or not each of the plurality of fuel nozzles (3) is misaligned by checking whether or not the tip (31) of each of the plurality of fuel nozzles (3) is inserted into the corresponding gauge hole (61).

[0067] 2) In some embodiments, the fuel nozzle misalignment confirmation device (1) described in 1) above includes: a mounting portion (8) having a mounting surface (81) on which the measurement plate (6) can be placed; and a fixing portion (9) that is detachably fixed to a nozzle support (4) that supports the plurality of fuel nozzles (3).

[0068] According to the configuration 2), by placing the measurement plate 6 on the mounting surface 81 of the base 7 fixed to the nozzle support 4, it becomes possible to check for misalignment of each of the fuel nozzles 3 using the measurement plate 6. By making the measurement plate 6 separate from the base 7, if some of the fuel nozzles 3 are significantly misaligned and their axial positions need to be adjusted, the adjustment can be performed by removing the measurement plate 6 from the base 7 while the base 7 remains fixed to the nozzle support 4. Furthermore, by making the measurement plate 6 separate from the base 7, the weight of the measurement plate 6 and the base 7 can be reduced, which makes it easier to check for misalignment of each of the fuel nozzles 3 using the measurement plate 6. It also becomes easy to perform the plate arrangement step and the misalignment confirmation step for each of a plurality of measurement plates (6) having gauge holes (61) with different diameters.

[0069] 3) In some embodiments, the fuel nozzle misalignment confirmation device (1) described in 2) above, The placement section (8) is a wall surface (86) surrounding the outer surface (64) of the measurement plate (6); The measuring plate (6) has at least one second positioning fitting portion (88) that is provided on the placement surface (81) and can be fitted with a first positioning fitting portion (65) that is provided on the measurement plate (6).

[0070] According to the configuration 3), when the measurement plate 6 is placed on the mounting surface 81, the measurement plate 6 is fitted into the space formed by the inner surface of the mounting portion 8, thereby restricting radial movement of the measurement plate 6 relative to the base 7 and the nozzle support 4. When the measurement plate 6 is placed on the mounting surface 81, the first positioning fitting portion 65 provided on the measurement plate 6 is fitted into the second positioning fitting portion 88, thereby restricting circumferential and radial movement of the measurement plate 6 relative to the base 7 and the nozzle support 4. According to the configuration 3), when the measurement plate 6 is placed on the mounting surface 81, the positioning operation of the measurement plate 6 relative to the base 7 and the nozzle support 4 is facilitated.

[0071] 4) In some embodiments, the fuel nozzle misalignment confirmation device (1) described in 2) or 3) above, The fixing portion (9) is a fitting protrusion (94) extending along a circumferential direction and capable of fitting into a fitting recess (44) provided along the circumferential direction on the nozzle support (4); and at least one fourth positioning fitting portion (95) that is provided on a surface that can abut against the end surface of the nozzle support (4) and that can fit with a third positioning fitting portion (45) that is provided on the end surface of the nozzle support (4).

[0072] According to the configuration of 4) above, when the fixing portion (9) of the base (7) is attached to the nozzle support body (4), the fitting protrusion (94) of the fixing portion (9) is fitted into the fitting recess (44) provided in the nozzle support body (4), thereby restricting radial movement of the base (7) relative to the nozzle support body (4). Then, when the fixing portion (9) of the base (7) is attached to the nozzle support body (4), the fourth positioning fitting portion (95) is fitted into the third positioning fitting portion (45), thereby restricting circumferential and radial movement of the base (7) relative to the nozzle support body (4). According to the configuration of 4) above, when attaching the base (7) to the nozzle support body (4), the positioning operation of the base (7) relative to the nozzle support body (4) is facilitated.

[0073] 5) In some embodiments, the fuel nozzle misalignment checking device (1) according to any one of 2) to 4) above, The base (7) is The device further includes at least one leg (10) that connects the mounting portion (8) and the fixing portion (9) that is axially spaced apart from the mounting portion (8), and forms a gap (G) in a part of the circumferential direction between the mounting portion (8) and the fixing portion (9) that allows the inside to be seen from the outside in the radial direction.

[0074] According to the configuration of 5), the mounting portion 8 can be supported on the fixed portion 9 by the at least one leg portion 10, and a relatively wide gap G can be formed between the mounting portion 8 and the fixed portion 9 in a circumferential range where no leg portion 10 is provided. When installing the measurement plate 6 on the base 7, an operator can check the positional relationship between the fuel nozzle 3 and the gauge hole 61 in the measurement plate 6 corresponding to the fuel nozzle 3 not only from the tip 31 side of the fuel nozzle 3 through the gauge hole 61, but also from directly beside the fuel nozzle 3 through the gap G (from a radially outer side of the gap G). Furthermore, by forming the gap G in the base 7, the weight of the base 7 can be reduced.

[0075] 6) In some embodiments, the fuel nozzle misalignment checking device (1) according to any one of 1) to 5) above, The measurement plate (6) At least one lightening hole (66) is formed radially outward of the plurality of gauge holes (61) and penetrates the measurement plate (6).

[0076] According to the configuration 6), the provision of the lightening holes 66 in the measurement plate 6 reduces the weight of the measurement plate 6. The lightening holes 66 allow the measurement plate 6 to be gripped, making it easier for an operator to grasp the measurement plate 6 and improving the handling of the measurement plate 6. This facilitates the task of checking for misalignment of each of the fuel nozzles 3 using the measurement plate 6. Furthermore, by providing the lightening holes 66 in the measurement plate 6, when installing the measurement plate 6 on the base 7, the positional relationship between the fuel nozzle 3 and the corresponding gauge hole 61 in the measurement plate 6 can be confirmed not only from the tip 31 side of the fuel nozzle 3 through the gauge hole 61, but also from the side of the fuel nozzle 3 through the lightening holes 66.

[0077] 7) In some embodiments, the fuel nozzle misalignment checking device (1) according to any one of 1) to 6) above, When the outer diameter of the tip (31) of the fuel nozzle (3) is defined as D1 and the inner diameter of the gauge hole (61) corresponding to the fuel nozzle (3) is defined as D2, the inner diameter D2 satisfies the condition D2≦1.25×D1.

[0078] According to the configuration of 7), when the inner diameter D2 of the gauge hole (61) satisfies the condition D2≦1.25×D1, if each of the plurality of fuel nozzles (3) can be inserted into the corresponding gauge hole (61), the amount of misalignment of each of the plurality of fuel nozzles (3) is relatively small, and therefore, an increase in the fuel concentration near the inner surface of the mixing hole (51) can be effectively suppressed.

[0079] 8) A method for checking fuel nozzle misalignment according to at least one embodiment of the present disclosure, comprising: A method for checking misalignment of a plurality of fuel nozzles (3) in a gas turbine combustor (2) including: a plurality of fuel nozzles (3); a nozzle support (4) supporting the plurality of fuel nozzles (3); and a mixing hole plate (5) having a plurality of mixing holes (51) formed therein through which fuel is injected from the fuel nozzles (3) and which mixes the fuel with a combustion gas, the method comprising: a plate arrangement step of covering the plurality of fuel nozzles (3) with a measurement plate (6) having a plurality of gauge holes (61) formed on one surface (62) thereof, the gauge holes (61) being larger in diameter than the tips (31) of the fuel nozzles (3) and smaller in diameter than the mixing holes (51); and a misalignment confirmation step of confirming whether or not the fuel nozzle (3) is misaligned based on whether or not the tip (31) of the fuel nozzle (3) is inserted into the gauge hole (61).

[0080] According to the method of 8), the measurement plate 6 having the gauge holes 61 formed therein is placed over the fuel nozzles 3, and it is checked whether the tip 31 of each of the fuel nozzles 3 is inserted into the corresponding gauge hole 61. This makes it possible to check at once whether each of the fuel nozzles 3 is misaligned.

[0081] 9) In some embodiments, the fuel nozzle misalignment confirmation method according to 8) above, further comprising: The plate arrangement step and the misalignment confirmation step are performed for each of the plurality of measurement plates (6) having gauge holes (61) with different hole diameters.

[0082] According to the method of 9), by performing the plate arrangement step and the misalignment confirmation step for each of the plurality of measurement plates (6) having gauge holes (61) with different diameters, it is possible to determine the diameters of the gauge holes (61) into which the plurality of fuel nozzles (3) can be inserted, and thereby the degree of misalignment of the plurality of fuel nozzles (3) can be determined. [Explanation of symbols]

[0083] 1. Fuel nozzle misalignment check device 2 Gas turbine combustor 3 fuel nozzle 4 Nozzle support 5 Mixing hole plate 6 Measurement plate 7. Foundation 8 Placement section 9 Fixed part 10 Legs 31 Tip 51 Mixing hole 54 Main body 55 Fixed part 56 Connecting part 61 Gauge hole 62 one side 81 Placement surface 85 recess 86 Wall 100 Gas Turbine

Claims

1. 1. A fuel nozzle misalignment checking device for checking whether or not there is misalignment of a plurality of fuel nozzles in a gas turbine combustor including: a plurality of fuel nozzles; and a mixing hole plate formed with a plurality of mixing holes through which fuel is injected from the fuel nozzles and which mix the fuel with a combustion gas, the fuel nozzle misalignment checking device comprising: a measurement plate having a plurality of gauge holes formed on one surface thereof, the gauge holes being larger in diameter than the tips of the fuel nozzles and smaller in diameter than the mixing holes, respectively, at axial positions of the plurality of fuel nozzles; Fuel nozzle misalignment check device.

2. a mounting section having a mounting surface on which the measurement plate can be placed; a fixing portion that is detachably fixed to a nozzle support that supports the plurality of fuel nozzles, The fuel nozzle misalignment checking device according to claim 1 .

3. The placement section is a wall surface surrounding the outer surface of the measurement plate; and at least one second positioning fitting portion provided on the mounting surface and capable of fitting with a first positioning fitting portion provided on the measurement plate. The fuel nozzle misalignment checking device according to claim 2.

4. The fixing portion is a fitting protrusion extending in a circumferential direction, the fitting protrusion being capable of fitting into a fitting recess provided in the nozzle support body in the circumferential direction; and at least one fourth positioning fitting portion provided on a surface that can come into contact with an end surface of the nozzle support body and that can fit with a third positioning fitting portion provided on the end surface of the nozzle support body.

4. The fuel nozzle misalignment checking device according to claim 2 or 3.

5. The base is and at least one leg portion that connects the mounting portion and the fixing portion that is spaced apart from the mounting portion in the axial direction and forms a gap in a part of the circumferential direction that allows the inside to be seen from the outside in the radial direction.

4. The fuel nozzle misalignment checking device according to claim 2 or 3.

6. The measurement plate is at least one lightening hole formed radially outward of the plurality of gauge holes and penetrating the measurement plate; The fuel nozzle misalignment checking device according to any one of claims 1 to 3.

7. When an outer diameter of the tip of the fuel nozzle is defined as D1 and an inner diameter of the gauge hole corresponding to the fuel nozzle is defined as D2, the inner diameter D2 satisfies the condition D2≦1.25×D1. The fuel nozzle misalignment checking device according to any one of claims 1 to 3.

8. 1. A method for checking misalignment of fuel nozzles in a gas turbine combustor, the method comprising: a plurality of fuel nozzles; a nozzle support supporting the plurality of fuel nozzles; and a mixing hole plate having a plurality of mixing holes formed therein through which fuel is injected from the fuel nozzles and which mixes the fuel with a combustion gas, the method comprising: a plate arrangement step of covering the plurality of fuel nozzles with a measurement plate having a plurality of gauge holes formed on one surface thereof, the gauge holes being larger in diameter than the tips of the fuel nozzles and smaller in diameter than the mixing holes, respectively, formed at axial positions of the plurality of fuel nozzles; a misalignment confirmation step of confirming whether or not the tip of the fuel nozzle is misaligned based on whether or not the tip of the fuel nozzle is inserted into the gauge hole. How to check fuel nozzle misalignment.

9. the plate arrangement step and the misalignment confirmation step are performed for each of the plurality of measurement plates having different gauge hole diameters; The method for checking fuel nozzle misalignment according to claim 8.

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