Deterioration determination device, deterioration determination system and deterioration determination method

Abstract

To provide a deterioration determination device, a deterioration determination system and a deterioration determination method capable of accurately determining whether or not a seal device of a rotary machine has deteriorated.SOLUTION: A deterioration determination device determines whether or not a seal device of a rotary machine has deteriorated. The rotary machine includes: a rotor; a bearing that rotatably supports the rotor; a bearing housing that surrounds the bearing; a seal air supply pipe that defines a seal air supply passage for causing seal air to be supplied to the bearing housing to flow; and a casing that surrounds the bearing housing. The casing separates the bearing housing from an external space filled with high-temperature high-pressure gas having a higher temperature and higher pressure than those of the seal air, and includes an inner peripheral surface on which the seal device is disposed in a space between an outer peripheral surface of the rotor and itself. The deterioration determination device is configured to determine that the seal device has deteriorated when first pressure corresponding to pressure in a first space formed between the casing and the bearing housing is larger than second pressure corresponding to pressure in a second space formed on the inner side of the bearing housing.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a deterioration determination device, a deterioration determination system, and a deterioration determination method for determining whether a sealing device of a rotary machine such as a gas turbine has deteriorated. [Background technology]

[0002] A sealing device is provided in a rotary machine such as a gas turbine. For example, a gas turbine disclosed in Patent Document 1 includes a rotor, a bearing that rotatably supports the rotor, a bearing housing that houses the bearing, a casing that houses the bearing housing, and an outer seal ring positioned between the casing and the rotor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 61-108808 Summary of the Invention [Problem to be solved by the invention]

[0004] The outer seal ring may deteriorate over time, but the above-mentioned patent document does not disclose a specific configuration for determining whether the outer seal ring has deteriorated.

[0005] An object of the present disclosure is to provide a deterioration determination device, a deterioration determination system, and a deterioration determination method that can accurately determine whether a sealing device of a rotary machine has deteriorated. [Means for solving the problem]

[0006] A deterioration determination device according to at least one embodiment of the present disclosure includes: A deterioration determination device for determining whether a sealing device of a rotary machine has deteriorated, comprising: The rotary machine includes: A rotor, a bearing that rotatably supports the rotor; a bearing housing surrounding the bearing; a seal air supply pipe defining a seal air supply path through which seal air supplied to the bearing housing flows; a casing surrounding the bearing housing, the casing separating the bearing housing from an external space filled with high-temperature, high-pressure gas having a temperature and pressure higher than those of the sealing air, and including an inner circumferential surface on which the sealing device is disposed between the inner circumferential surface of the rotor and the casing; Equipped with The device is provided with a judgment unit configured to judge that the sealing device has deteriorated when a first pressure corresponding to the pressure in a first space formed between the casing and the bearing housing is greater than a second pressure corresponding to the pressure in a second space formed inside the bearing housing.

[0007] A deterioration determination system according to an embodiment of the present disclosure includes: the deterioration determination device; the rotating machine; Equipped with.

[0008] A degradation determination method according to an embodiment of the present disclosure includes: A deterioration determination method for determining whether a sealing device of a rotary machine has deteriorated, comprising: The rotary machine includes: A rotor, a bearing that rotatably supports the rotor; a bearing housing surrounding the bearing; a seal air supply pipe defining a seal air supply path through which seal air supplied to the bearing housing flows; a casing surrounding the bearing housing, the casing separating the bearing housing from an external space filled with high-temperature, high-pressure gas having a temperature and pressure higher than those of the sealing air, and including an inner circumferential surface on which the sealing device is disposed between the inner circumferential surface of the rotor and the casing; Equipped with The method includes a determination step configured to determine that the sealing device has deteriorated when a first pressure corresponding to the pressure in a first space formed between the casing and the bearing housing is greater than a second pressure corresponding to the pressure in a second space formed inside the bearing housing. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a deterioration determination device, a deterioration determination system, and a deterioration determination method that can accurately determine whether a sealing device of a rotary machine has deteriorated. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a deterioration determination system according to an embodiment; [Figure 2] FIG. 2 is a schematic diagram of a gas generator section according to one embodiment. [Figure 3] FIG. 2 is a schematic enlarged view of a bearing according to an embodiment. [Figure 4] 1 is a flowchart of a degradation determination method according to an embodiment. 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. For example, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement exactly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions representing shapes such as a square shape or a cylindrical shape not only represent shapes such as a square shape or a cylindrical shape 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. On the other hand, the expressions "comprise," "include," or "have" one element are not exclusive expressions that exclude the presence of other elements. Note that the same components will be denoted by the same reference numerals and the description thereof will be omitted.

[0012] <Deterioration determination system 100> 1 is a schematic diagram of a deterioration determination system 100 according to an embodiment of the present disclosure. The deterioration determination system 100 includes a gas turbine 1 as an example of a rotary machine, and a deterioration determination device 90 for determining whether a sealing device 70 provided in the gas turbine 1 has deteriorated. The number of sealing devices 70 may be one or more, and in this example, two sealing devices 70 are provided. The deterioration determination device 90 is realized by a computer having a processor.

[0013] In the following description, the axial direction, circumferential direction, and radial direction of the gas turbine 1 may be simply referred to as the "axial direction," the "circumferential direction," and the "radial direction," respectively. The axial direction is the horizontal direction.

[0014] <Gas Turbine 1> 1 is a two-shaft gas turbine in which a high-pressure turbine 6 and a low-pressure turbine 18 rotate independently of each other. More specifically, the gas turbine 1 of this example includes a gas generator section 3 incorporating the high-pressure turbine 6, and a power generation section 4 incorporating the low-pressure turbine 18. As will be described in detail later, a sealing device 70 is provided in the gas generator section 3.

[0015] The gas generator section 3 includes a compressor 2, a combustor 15 in which combustion occurs of a mixed gas obtained by adding fuel gas to compressed air discharged from the compressor 2, a high-pressure turbine 6 for driving the compressor 2 to rotate using the combustion gas discharged from the combustor 15 as a working medium, and a first rotor 7 connected to the compressor 2 and the high-pressure turbine 6. The rotational driving force of the high-pressure turbine 6 is transmitted to the compressor 2 via the first rotor 7, thereby driving the compressor 2 to rotate.

[0016] As shown in FIG. 2, the compressor 2 includes a plurality of stages 14. Each stage 14 is composed of a plurality of stator vanes 11 arranged in the circumferential direction and a plurality of rotor blades 12 arranged in the circumferential direction immediately downstream of the plurality of stator vanes 11. The plurality of stages 14 are lined up between the compressor inlet and the compressor outlet 19. The plurality of stages 14 includes a plurality of intermediate stages 14M located between the first stage and the final stage. In this example, compressed air that has passed through any of the plurality of intermediate stages 14M is bled and supplied to a bearing housing 30, which will be described later.

[0017] Returning to Fig. 1, the power generation unit 4 includes a low-pressure turbine 18 that rotates using the combustion gas that has passed through the high-pressure turbine 6 as a working medium, a generator 10 that generates electric power, and a second rotor 9 that is connected to the low-pressure turbine 18 and the generator 10. The rotational driving force of the low-pressure turbine 18 is transmitted to the generator 10 via the second rotor 9, causing the generator 10 to generate electric power. In the gas turbine 1 illustrated in Fig. 1, the high-pressure turbine 6 and the low-pressure turbine 18 can rotate independently of each other, so that when the power generation load of the generator 10 fluctuates, the output of the high-pressure turbine 6 can be maintained while controlling the output of the low-pressure turbine 18.

[0018] The gas generator section 3 further includes a first bearing 21 and a second bearing 22 that each rotatably support the first rotor 7. The first bearing 21 is disposed axially on the opposite side of the compressor 2 from the high-pressure turbine 6, and the second bearing 22 is disposed axially between the compressor 2 and the high-pressure turbine 6. For ease of explanation, the second bearing 22 may be referred to as the "bearing 22" below.

[0019] <Configuration of the surroundings of bearing 22> As illustrated in FIG. 2, the gas generator section 3 further includes a bearing housing 30 surrounding the bearing 22, a labyrinth seal 38 disposed between the bearing housing 30 and the first rotor 7, and a casing 50 surrounding the bearing housing 30.

[0020] The bearing housing 30 includes an inner bearing housing 31 that surrounds the bearing 22, and an outer bearing housing 32 that surrounds the inner bearing housing 31. Labyrinth seals 38 are arranged between the inner bearing housing 31 and the first rotor 7, and between the outer bearing housing 32 and the first rotor 7. An oil supply pipe (not shown) is connected to the inner bearing housing 31, and lubricating oil supplied through the oil supply pipe is supplied to the bearing arrangement space 83 within the inner bearing housing 31.

[0021] The casing 50 of this example constitutes a part of the combustor casing 16 that supports the combustor 15. More specifically, the combustor casing 16 includes an inner diameter sidewall portion 161 and an outer diameter sidewall portion 162 that define a flow path of compressed air from the compressor 2 to the combustor 15, and the casing 50 constitutes a part of the inner diameter sidewall portion 161.

[0022] The casing 50 separates the bearing housing 30 from an external space 85 of the casing 50. As a more specific example, the casing 50 cooperates with a protruding wall portion 7b that protrudes radially from the main body portion 7a of the first rotor 7 to separate the bearing housing 30 from the external space 85. The external space 85 in this example includes a first external space 85a and a second external space 85b that are aligned in the axial direction with the casing 50 and the protruding wall portion 7b between them, and the first external space 85a and the second external space 85b are filled with high-temperature, high-pressure compressed air discharged from the compressor outlet 19 (arrows A1, A2).

[0023] The casing 50 includes an inner circumferential surface 51. The inner circumferential surface 51 has a first inner circumferential surface 51a that is positioned axially closer to the high-pressure turbine 6 than the bearing housing 30, and a second inner circumferential surface 51b that is positioned axially closer to the compressor 2 than the bearing housing 30. The first inner circumferential surface 51a faces the outer circumferential surface 77a of the main body portion 7a of the first rotor 7, and the second inner circumferential surface 51b faces the outer circumferential surface 77b of the protruding wall portion 7b of the first rotor 7. The second inner circumferential surface 51b is positioned radially outward of the first inner circumferential surface 51a.

[0024] The above-described sealing device 70 includes a first sealing device 71 disposed between the first inner circumferential surface 51a and the outer circumferential surface 77a, and a second sealing device 72 disposed between the second inner circumferential surface 51b and the outer circumferential surface 77b. Both the first sealing device 71 and the second sealing device 72 are brush seals. The sealing action of each of the first sealing device 71 and the second sealing device 72 prevents compressed air filling the external space 85 from flowing into a first space 81 formed between the casing 50 and the outer bearing housing 32. As will be described in detail later, sealing air flows into the first space 81 from a second space 82 formed between the outer bearing housing 32 and the inner bearing housing 31.

[0025] <Piping section 130> 3, the gas turbine 1 further includes a piping section 130 having a triple-pipe structure. The piping section 130 includes a first cylindrical section 131 extending upward from the inner bearing housing 31, a second cylindrical section 132 surrounding the first cylindrical section 131 and extending upward from the outer bearing housing 32, and a third cylindrical section 133 surrounding the second cylindrical section 132 and extending upward from the casing 50.

[0026] The first cylindrical portion 131 is connected to a through hole provided in the inner bearing housing 31. The inner peripheral surface of the first cylindrical portion 131 defines an oil discharge path 109 that guides oil mist within the bearing arrangement space 83 to an oil tank (not shown). The first cylindrical portion 131 is connected to the oil tank, and the pressure in the internal space of the oil tank is set lower than atmospheric pressure. Therefore, the oil mist within the bearing arrangement space 83 can flow to the oil tank via the oil discharge path 109.

[0027] The second cylindrical portion 132 is connected to a through hole provided in the outer bearing housing 32. The inner circumferential surface of the second cylindrical portion 132 and the outer circumferential surface of the first cylindrical portion 131 define at least a part of the seal air supply passage 108. The seal air supply passage 108 is a flow path through which compressed air bled from the intermediate stage 14M (see FIG. 2) flows as seal air to the second space 82. In this example, the downstream portion of the seal air supply passage 108 is defined by the first cylindrical portion 131 and the second cylindrical portion 132, and the upstream portion of the seal air supply passage 108 is defined by the seal air supply pipe 40. The seal air supply pipe 40 is connected to a compressor casing of the compressor 2 and a branch section 139 arranged at the upper end of the piping section 130. The seal air flowing from the seal air supply passage 108 into the second space 82 passes between the outer bearing housing 32 and the labyrinth seal 38 and flows into the first space 81 (arrows B1 and B2).

[0028] The third cylindrical portion 133 is connected to a through hole provided in the casing 50. The inner circumferential surface of the third cylindrical portion 133 and the outer circumferential surface of the second cylindrical portion 132 define at least a part of the seal air discharge path 107. The seal air discharge path 107 is a flow path through which the seal air that has flowed from the second space 82 to the first space 81 is discharged to the outside of the gas turbine 1. In this example, the upstream portion of the seal air discharge path 107 is defined by the second cylindrical portion 132 and the third cylindrical portion 133, and the downstream portion is defined by the discharge pipe 29. The discharge pipe 29 extends from a branch portion 139 of the pipe portion 130 to the outside of the gas turbine 1.

[0029] Note that part of the sealing air filling the first space 81 may pass between the inner bearing housing 31 and the labyrinth seal 38 and flow into the bearing arrangement space 83 (arrows C1 and C2). The sealing air in the bearing arrangement space 83 is discharged to the outside of the gas turbine 1 via the oil discharge path 109.

[0030] <Deterioration determination device 90> According to the inventor's findings, when the sealing device 70 deteriorates, compressed air in the external space 85 passes through the sealing device 70 and flows into the first space 81 (arrows D1 and D2). The compressed air in the external space 85 is compressed air discharged from the compressor outlet 19, and is at a higher temperature and pressure than the compressed air (sealed air) that is bled from the intermediate stage 14M and flows through the first space 81. Therefore, the compressed air that flows from the external space 85 into the first space 81 flows into the second space 82 via the labyrinth seal 38. As a result of the temperature rising inside the bearing housing 30, the lubricating oil in the bearing arrangement space 83 deteriorates, which can lead to failure of the bearing 22.

[0031] Therefore, in this embodiment, a deterioration determination device 90 is provided to determine whether the sealing device 70 has deteriorated. The deterioration determination device 90 includes a first pressure calculation unit 91, a second pressure calculation unit 92, and a determination unit 95.

[0032] The first pressure calculation unit 91 calculates a first pressure corresponding to the pressure in the first space 81 based on the measurement result of a first pressure gauge 101 for measuring the pressure in the discharge pipe 29. The second pressure calculation unit 92 calculates a second pressure corresponding to the pressure in the second space 82 based on the measurement result of a second pressure gauge 102 for measuring the pressure in the sealing air supply pipe 40. The determination unit 95 determines that the sealing device 70 has deteriorated when the first pressure calculated by the first pressure calculation unit 91 is greater than the second pressure calculated by the second pressure calculation unit 92.

[0033] If the sealing device 70 is not deteriorated, the second pressure is slightly higher than the first pressure. However, if the sealing device 70 deteriorates, high-temperature, high-pressure compressed air flows from the external space 85 into the first space 81, increasing the first pressure. As a result, the first pressure becomes greater than the second pressure. With the above configuration, the determination unit 95 can determine that the sealing device 70 has deteriorated in this case. Therefore, a deterioration determination device 90 is realized that can accurately determine whether the sealing device 70 has deteriorated, and failure of the bearings 22 of the gas turbine 1 can be avoided.

[0034] The first pressure gauge 101 and the second pressure gauge 102 may be disposed in the piping section 130, respectively. Even in this case, it is possible to identify the first pressure and the second pressure. Alternatively, the determination section 95 may determine the magnitude relationship between the first pressure and the second pressure based on a parameter correlated with the first pressure and the second pressure. Even in this case, the above-described technical advantages can be obtained.

[0035] Furthermore, according to the configuration in which the first pressure gauge 101 and the second pressure gauge 102 are provided in the discharge pipe 29 and the sealing air supply pipe 40, respectively, the determination unit 95 can determine whether the sealing device 70 has deteriorated based on the measurement values ​​of the first pressure gauge 101 and the second pressure gauge 102. Furthermore, since the first pressure gauge 101 and the second pressure gauge 102 can be disposed outside the casing 50, pressure measurement can be performed more easily than when these pressure gauges are disposed inside the casing 50. Furthermore, since the first pressure gauge 101 and the second pressure gauge 102 of this example are disposed outside the combustor casing 16, pressure measurement is further facilitated.

[0036] In some embodiments, the first pressure calculation unit 91 may calculate the first pressure by adding a first correction value to the measurement value of the first pressure gauge 101. The first correction value is a value corresponding to a first pressure loss in the sealing air discharge passage 107 from the casing 50 to the first pressure gauge 101. The first pressure loss is determined in advance by calculation or actual measurement. Furthermore, the first correction value may be a value obtained by adding a margin value having a specified ratio to the first pressure loss to the first pressure loss.

[0037] The second pressure calculation unit 92 may calculate the second pressure by subtracting a second correction value from the measurement value of the second pressure gauge 102. The second correction value is a value equivalent to a second pressure loss in the seal air supply path 108 from the second pressure gauge 102 to the outer bearing housing 32. The second pressure loss is a value determined in advance by calculation or actual measurement. The second correction value may be the same value as the second pressure loss.

[0038] According to the above configuration, the first pressure loss in the sealing air discharge passage 107 and the second pressure loss in the sealing air supply passage 108 are taken into consideration when calculating the first pressure and the second pressure. This makes it possible to reduce the difference between the first pressure calculated by the first pressure calculation section 91 and the actual pressure in the first space 81, and similarly, to reduce the difference between the second pressure calculated by the second pressure calculation section 92 and the actual pressure in the second space 82. This allows the determination section 95 to more accurately determine whether the sealing device 70 has deteriorated.

[0039] In the above embodiment, the seal air supply pipe 40 supplies seal air to the second space 82 formed between the inner bearing housing 31 and the outer bearing housing 32. With this configuration, even when high-temperature, high-pressure compressed air flows from the external space 85 into the first space 81, the compressed air can be prevented from entering the bearing arrangement space 83 of the inner bearing housing 31. This reduces the possibility of the bearing 22 failing.

[0040] Furthermore, in the above embodiment, the sealing device 70 is a brush seal. In the gas turbine 1, there is a large pressure difference between the external space 85 filled with high-temperature, high-pressure compressed air discharged from the compressor outlet 19 and the first space 81 through which the sealing air flows, and therefore it is desirable to employ a brush seal with high sealing properties as the sealing device 70. However, there is a high possibility that the brush seal will deteriorate over time due to sliding between the brush seal and the casing 50 when the first rotor 7 rotates. In this regard, with the above configuration, the determining unit 95 can accurately determine the deterioration of the brush seal, and therefore it is possible to appropriately grasp changes in the brush seal over time.

[0041] <Deterioration judgment method> 4 is a flowchart showing a method for determining deterioration of the sealing device 70. The deterioration determination method is executed by a processor of the sealing device 70. In the following, steps may be abbreviated as "S".

[0042] First, the processor calculates the first pressure (S1). Specifically, the processor calculates the first pressure by adding a first correction value to the measurement value of the first pressure gauge 101. The processor that executes S1 is an example of the first pressure calculation unit 91.

[0043] Next, the processor calculates the second pressure (S2). Specifically, the processor calculates the second pressure by subtracting the second correction value from the measurement value of the second pressure gauge 102. The processor that executes S2 is an example of the second pressure calculation unit 92.

[0044] Next, the processor determines whether the sealing device 70 has deteriorated (S3). Specifically, the processor determines whether the first pressure calculated in S1 is greater than the second pressure calculated in S2. If the first pressure is equal to or less than the second pressure (S3: NO), the processor determines that the sealing device 70 has not deteriorated, and ends this flowchart. On the other hand, if the first pressure is greater than the second pressure (S3: YES), the processor notifies the user that the sealing device 70 has deteriorated (S4). For example, the processor may display a message indicating deterioration of the sealing device 70 on the monitor of a personal computer. After executing S4, the processor ends this flowchart. The processor that executes S3 is an example of the determination unit 95.

[0045] <Modification> The present disclosure is not limited to the casing 50 cooperating with the protruding wall portion 7b to separate the bearing housing 30 from the external space 85. In other words, the protruding wall portion 7b of the first rotor 7 is not an essential component of the present disclosure. The casing 50 may be provided with a radially extending portion that extends radially in the space in which the protruding wall portion 7b is disposed. In this case, the casing 50 separates the bearing housing 30 from the external space 85 by itself.

[0046] The gas turbine 1 may not be provided with the piping section 130. In this case, the seal air supply pipe 40 may be connected to the outer bearing housing 32, and the discharge pipe 29 may be connected to the casing 50. In other words, the seal air supply passage 108 may be defined only by the seal air supply pipe 40, and the seal air discharge passage 107 may be defined only by the seal air supply pipe 40. The gas turbine 1 may be a single-shaft gas turbine instead of a two-shaft gas turbine. Furthermore, the rotary machine may be a compressor 2 or the like instead of the gas turbine 1.

[0047] 4 may be executed by an operator instead of a processor. That is, the calculation of the first pressure (S1), the calculation of the second pressure (S2), and the determination of the magnitude relationship between the first pressure and the second pressure (S3) may all be executed by the operator.

[0048] <Other> The deterioration determination device 90 is configured by a computer and includes a processor, memory (storage medium), and an external communication interface. The processor may be a CPU, GPU, MPU, DSP, or a combination thereof. The processor according to other embodiments may be implemented by an integrated circuit such as a PLD, ASIC, FPGA, or MCU. The memory is configured to temporarily or non-temporarily store various data and may be implemented by at least one of RAM, ROM, and flash memory, for example. The processor executes various control processes according to instructions from a program loaded into the memory.

[0049] <Summary> The contents of the above-described embodiments can be understood, for example, as follows.

[0050] 1) A deterioration determination device (90) according to at least one embodiment of the present disclosure includes: A deterioration determination device (90) for determining whether a sealing device (70) of a rotary machine (gas turbine 1) has deteriorated, The rotary machine includes: a rotor (first rotor 7); a bearing (22) that rotatably supports the rotor; a bearing box (30) surrounding the bearing; a seal air supply pipe (40) defining a seal air supply passage (108) through which seal air supplied to the bearing housing flows; a casing (50) surrounding the bearing housing, the casing separating the bearing housing from an external space (85) filled with high-temperature, high-pressure gas having a temperature and pressure higher than those of the sealing air, and including an inner peripheral surface (51) on which the sealing device is disposed between the inner peripheral surface (51) and an outer peripheral surface (77a, 77b) of the rotor; Equipped with The device is provided with a determination unit (95) configured to determine that the sealing device has deteriorated when a first pressure corresponding to the pressure in a first space (81) formed between the casing and the bearing housing is greater than a second pressure corresponding to the pressure in a second space (82) formed inside the bearing housing.

[0051] When the sealing device deteriorates, high-temperature, high-pressure gas in the external space passes through the sealing device and flows into the first space, increasing the first pressure. In this regard, according to the configuration of 1) above, the determination unit determines that the sealing device has deteriorated when the first pressure becomes greater than the second pressure. Therefore, a deterioration determination device that can accurately determine whether the sealing device has deteriorated is realized.

[0052] 2) In some embodiments, the deterioration determination device according to 1) above, The rotary machine includes: a discharge pipe (29) defining a seal air discharge path (107) through which the seal air that has flowed from the bearing housing to the first space flows to the outside of the rotary machine; a first pressure gauge (101) for measuring the pressure in the discharge pipe; a second pressure gauge (102) for measuring the pressure in the sealing air supply pipe; Including, a first pressure calculation unit (91) for calculating the first pressure based on the measurement value of the first pressure gauge; a second pressure calculation unit (92) for calculating the second pressure based on the measurement value of the second pressure gauge; Further provided are:

[0053] According to the configuration of 2), the determination unit can determine whether the sealing device has deteriorated based on the measurement values ​​of the first and second pressure gauges. Furthermore, since the first and second pressure gauges can be disposed outside the casing, pressure measurement can be performed more easily than when these pressure gauges are disposed inside the casing.

[0054] 3) In some embodiments, the deterioration determination device according to 2) above, the first pressure calculation unit is configured to calculate the first pressure by adding a first correction value corresponding to a first pressure loss in the sealing air discharge path from the casing to the first pressure gauge to a measurement value of the first pressure gauge, The second pressure calculation unit is configured to calculate the second pressure by subtracting a second correction value corresponding to a second pressure loss in the sealing air supply path from the second pressure gauge to the bearing housing from the measurement value of the second pressure gauge.

[0055] According to the configuration of 3), the first pressure loss in the sealing air discharge passage and the second pressure loss in the sealing air supply passage are taken into account when calculating the first pressure and the second pressure. This reduces the difference between the first pressure calculated by the first pressure calculation unit and the actual pressure in the first space, and similarly reduces the difference between the second pressure calculated by the second pressure calculation unit and the actual pressure in the second space. This allows the determination unit to more accurately determine whether the sealing device has deteriorated.

[0056] 4) The deterioration determination system (100) according to at least one embodiment of the present disclosure includes: a deterioration determination device (90) according to any one of 1) to 3) above; The rotary machine (gas turbine 1) Equipped with.

[0057] The configuration 4) above provides the same technical advantages as the configuration 1).

[0058] 5) In some embodiments, the deterioration determination system according to 4) above, The bearing housing is an inner bearing box (31) surrounding the bearing; an outer bearing housing (32) surrounding the inner bearing housing; and the second space is a space between the inner bearing housing and the outer bearing housing, The seal air supply pipe is configured to supply the seal air to the second space.

[0059] According to the configuration of 5) above, sealing air is supplied to the second space formed between the inner ring bearing housing and the outer bearing housing, so even if high-temperature, high-pressure gas flows into the first space from the external space, the high-temperature, high-pressure gas can be prevented from entering the inside of the inner bearing housing, thereby reducing the possibility of bearing failure.

[0060] 6) In some embodiments, the deterioration determination system according to 5) above, the rotary machine is a gas turbine (1); The high-temperature, high-pressure gas is compressed air discharged from an outlet (compressor outlet 19) of a compressor (2) of the gas turbine, The seal air is compressed air extracted from an intermediate stage (14M) of the compressor located upstream of the outlet.

[0061] If high-temperature, high-pressure compressed air discharged from the compressor outlet enters the inside of the inner bearing housing through the first space due to deterioration of the sealing device, there is a risk that the lubricating oil inside the inner bearing housing will deteriorate. In this case, bearing failure may occur. In this regard, according to the configuration of 6) above, the deterioration determination device accurately determines deterioration of the sealing device, so that failure of the gas turbine bearings can be avoided.

[0062] 7) In some embodiments, the deterioration determination system according to 6) above, The sealing device is a brush seal.

[0063] Because there is a large pressure difference between the external space filled with high-temperature, high-pressure compressed air discharged from the compressor outlet and the first space through which the bleed compressed air flows as sealing air, it is preferable to use a brush seal with high sealing properties as the sealing device. However, due to sliding between the brush seal and the casing when the rotor rotates, the brush seal is likely to deteriorate over time. In this regard, with the configuration of 7) above, the determining unit can accurately determine the deterioration of the brush seal, making it possible to appropriately grasp the deterioration of the brush seal over time.

[0064] 8) A degradation determination method according to at least one embodiment of the present disclosure includes: A deterioration determination method for determining whether a sealing device (70) of a rotary machine (gas turbine 1) has deteriorated, comprising: The rotary machine includes: a rotor (first rotor 7); a bearing (22) that rotatably supports the rotor; a bearing box (30) surrounding the bearing; a seal air supply pipe (40) defining a seal air supply passage (108) through which seal air supplied to the bearing housing flows; a casing (50) surrounding the bearing housing, the casing separating the bearing housing from an external space (85) filled with high-temperature, high-pressure gas having a temperature and pressure higher than those of the sealing air, and including an inner peripheral surface (51) on which the sealing device is disposed between the inner peripheral surface (51) and an outer peripheral surface (77a, 77b) of the rotor; Equipped with The deterioration determination method includes a determination step (S3) configured to determine that the sealing device is deteriorated when a first pressure corresponding to the pressure in a first space (81) formed between the casing and the bearing housing is greater than a second pressure corresponding to the pressure in a second space (82) formed inside the bearing housing.

[0065] According to the configuration 8) above, the same technical advantages as those in 1) above can be obtained. [Explanation of symbols]

[0066] 1: Gas turbine 2: Compressor 3: Gas generator section 4: Power generation section 6: High pressure turbine 7: First rotor (rotor) 7a: Main body 7b:Protruding wall part 9: Second rotor 10: Generator 11: Stator blade 12: Moving blade 14 :Paragraph 14M: Middle paragraph 15: Combustor 16: Combustor casing 18: Low-pressure turbine 19: Compressor outlet (outlet) 21: First bearing 22: Second bearing (bearing) 29:Discharge piping 30: Bearing box 31:Inner bearing box 32:Outer bearing box 38: Labyrinth Seal 40: Sealed air supply pipe 50: Casing 51: Inner surface 51a: First inner peripheral surface 51b: Second inner peripheral surface 70: Sealing device 71: First sealing device 72: Second sealing device 77a: Outer surface 77b: Outer surface 81: 1st space 82:Second space 83: Bearing arrangement space 85: Exterior space 85a: 1st external space 85b: 2nd external space 90: Deterioration determination device 91: First pressure calculation unit 92: Second pressure calculation unit 95: Judgment section 100: Deterioration assessment system 101: First pressure gauge 102: Second pressure gauge 107: Sealed air exhaust passage 108: Sealed air supply passage 109:Oil drain path 130: Piping section 131:First cylindrical part 132:Second cylinder part 133:Third cylinder part 139: Branch 161: Inner diameter side wall 162: Outer diameter side wall part

Claims

1. A deterioration determination device for determining whether a sealing device of a rotary machine has deteriorated, comprising: The rotary machine includes: A rotor, a bearing that rotatably supports the rotor; a bearing housing surrounding the bearing; a seal air supply pipe defining a seal air supply path through which seal air supplied to the bearing housing flows; a casing surrounding the bearing housing, the casing separating the bearing housing from an external space filled with high-temperature, high-pressure gas having a temperature and pressure higher than those of the sealing air, and including an inner circumferential surface on which the sealing device is disposed between the inner circumferential surface of the rotor and the casing; Equipped with A deterioration determination device comprising a determination unit configured to determine that the sealing device is deteriorated when a first pressure corresponding to the pressure in a first space formed between the casing and the bearing housing is greater than a second pressure corresponding to the pressure in a second space formed inside the bearing housing.

2. The rotary machine includes: a discharge pipe that defines a seal air discharge path through which the seal air that has flowed from the bearing housing to the first space flows to the outside of the rotary machine; a first pressure gauge for measuring the pressure in the discharge pipe; a second pressure gauge for measuring the pressure in the sealing air supply pipe; Including, a first pressure calculation unit for calculating the first pressure based on a measurement value of the first pressure gauge; a second pressure calculation unit for calculating the second pressure based on a measurement value of the second pressure gauge; Further equipped The deterioration determination device according to claim 1 .

3. the first pressure calculation unit is configured to calculate the first pressure by adding a first correction value corresponding to a first pressure loss in the sealing air discharge path from the casing to the first pressure gauge to a measurement value of the first pressure gauge, The second pressure calculation unit is configured to calculate the second pressure by subtracting a second correction value corresponding to a second pressure loss in the seal air supply path from the second pressure gauge to the bearing housing from the measurement value of the second pressure gauge. The deterioration determination device according to claim 2 .

4. A deterioration determination device according to any one of claims 1 to 3; the rotating machine; A deterioration determination system comprising:

5. The bearing housing is an inner bearing housing surrounding the bearing; an outer bearing housing surrounding the inner bearing housing; and the second space is a space between the inner bearing housing and the outer bearing housing, The seal air supply pipe is configured to supply the seal air to the second space. The deterioration determination system according to claim 4 .

6. the rotary machine is a gas turbine; the high-temperature, high-pressure gas is compressed air discharged from an outlet of a compressor of the gas turbine, The seal air is compressed air extracted from an intermediate stage of the compressor located upstream of the outlet. The deterioration determination system according to claim 5 .

7. The sealing device is a brush seal. The deterioration determination system according to claim 6 .

8. A deterioration determination method for determining whether a sealing device of a rotary machine has deteriorated, comprising: The rotary machine includes: A rotor, a bearing that rotatably supports the rotor; a bearing housing surrounding the bearing; a seal air supply pipe defining a seal air supply path through which seal air supplied to the bearing housing flows; a casing surrounding the bearing housing, the casing separating the bearing housing from an external space filled with high-temperature, high-pressure gas having a temperature and pressure higher than those of the sealing air, and including an inner circumferential surface on which the sealing device is disposed between the inner circumferential surface of the rotor and the casing; Equipped with A deterioration determination method comprising a determination step configured to determine that the sealing device is deteriorated when a first pressure corresponding to the pressure in a first space formed between the casing and the bearing housing is greater than a second pressure corresponding to the pressure in a second space formed inside the bearing housing.

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