WO2021235314A1 - ドレン除去監視装置 - Google Patents
ドレン除去監視装置 Download PDFInfo
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- WO2021235314A1 WO2021235314A1 PCT/JP2021/018215 JP2021018215W WO2021235314A1 WO 2021235314 A1 WO2021235314 A1 WO 2021235314A1 JP 2021018215 W JP2021018215 W JP 2021018215W WO 2021235314 A1 WO2021235314 A1 WO 2021235314A1
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- Prior art keywords
- flow rate
- liquid phase
- gas phase
- gas
- measuring device
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 67
- 239000012071 phase Substances 0.000 claims abstract description 140
- 239000007791 liquid phase Substances 0.000 claims abstract description 123
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 239000012530 fluid Substances 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims description 28
- 230000007246 mechanism Effects 0.000 claims description 26
- 230000005514 two-phase flow Effects 0.000 claims description 20
- 230000005856 abnormality Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- -1 that is Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/602—Drainage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/306—Mass flow
Definitions
- the present disclosure relates to a drain removal monitoring device.
- This application claims priority based on Japanese Patent Application No. 2020-87905 filed with the Japan Patent Office on May 20, 2020, and the contents thereof are incorporated herein by reference.
- the blades may be damaged by erosion due to the collision of water droplets with the blades.
- Patent Document 1 a slit that communicates the internal space inside the stationary blade and the outside of the stationary blade is formed on the blade surface of the hollow stationary blade, and the moisture adhering to the surface of the stationary blade is formed through the slit.
- a steam turbine capable of removing drainage by sucking (liquid phase) into an internal space by a pressure difference is disclosed. In this steam turbine, drainage is removed by adjusting the pressure difference between the outside and the inside space of the stationary blade to an appropriate pressure difference according to the turbine load fluctuation.
- At least one embodiment of the present disclosure is an object of providing a drain removal monitoring device capable of grasping whether or not drain removal is properly performed.
- the drain removal monitoring device is used in a steam turbine, through a slit formed in the surface of at least one hollow blade including an internal space, to be outside the stationary blade.
- a drain removal monitoring device for monitoring drain removal performed by sucking a fluid into the internal space, and a gas-liquid separation device for separating the fluid sucked into the internal space into a liquid phase and a gas phase.
- a liquid phase flow rate measuring device for measuring the flow rate of the liquid phase separated by the gas-liquid separation device, a gas phase flow rate measuring device for measuring the flow rate of the gas phase separated by the gas-liquid separation device, and the above. It is provided with a liquid phase return line for communicating the liquid phase flow rate measuring device and the steam turbine, and a gas phase return line for communicating the gas phase flow rate measuring device and the steam turbine.
- the flow rate of both the liquid phase and the gas phase in the fluid sucked into the internal space of the stationary blade through the slit formed in the stationary blade of the steam turbine is measured, so that the drain is measured. It is possible to grasp whether the removal is performed properly.
- FIG. 3 is a block configuration diagram of a preferable configuration of a drain removal monitoring device for diagnosing an abnormality in drain removal from the flow rates of a liquid phase and a gas phase in the drain removal monitoring device according to the first embodiment of the present disclosure. It is a graph which shows the abnormality detection example of drain removal. It is a graph which shows the abnormality detection example of drain removal.
- the drain removal monitoring device 10 is a steam turbine 1 through a slit 4 formed on the surface of at least one hollow blade 2 including an internal space 3.
- the purpose is to monitor the drain removal performed by sucking the fluid outside the stationary blade 2 into the internal space 3.
- the diaphragm 5 to which the stationary blade 2 is connected is configured in a hollow shape including the internal space 6, and the internal space 6 and the internal space 3 are in communication with each other.
- the steam turbine 1 includes a turbine including a stationary blade 2, a turbine outlet exhaust casing, and a condenser casing.
- the drain removal monitoring device 10 measures the flow rate of the gas-liquid separation device 11 that separates the liquid phase and the fluid including the gas phase into the liquid phase and the gas phase, and the liquid phase separated by the gas-liquid separation device 11.
- a flow rate measuring device 12 a gas phase flow rate measuring device 13 for measuring the flow rate of the gas phase separated by the gas / liquid separating device 11, and a liquid phase return line 14 for communicating the liquid phase flow measuring device 12 and the steam turbine 1.
- the gas phase return line 15 for communicating the gas phase flow rate measuring device 13 and the steam turbine 1 is provided.
- the drain removal monitoring device 10 further includes a two-phase flow distribution line 16 that communicates the internal space 6 in the diaphragm 5 and the gas-liquid separation device 11. Since the internal space 6 and the internal space 3 communicate with each other, the two-phase flow flow line 16 communicates the internal space 3 and the gas-liquid separation device 11 via the internal space 6. Further, the drain removal monitoring device 10 further includes a gas phase distribution line 17 that communicates the gas-liquid separation device 11 and the gas phase flow rate measuring device 13.
- the configuration of the gas-liquid separation device 11 is not particularly limited, and a demista type, a corrugated plate type, a cyclone type cyclone separator or the like using a mesh or the like can be used.
- the cyclone type configuration has a wider flow rate range that can maintain low pressure loss and high-performance gas-liquid separation than the mesh configuration, and it is possible to follow changes in measurement conditions and expand the control range. It is preferable to use a cyclone separator as the gas-liquid separation device 11.
- the configuration of the liquid phase flow rate measuring device 12 is not particularly limited, and a measuring device having any configuration can be used.
- a tank unit 21 for storing the liquid phase separated by the gas-liquid separation device 11 and a liquid phase amount detecting unit 22 for detecting the amount of the liquid phase in the tank unit 21 are provided. You can use what you include.
- a liquid level meter for detecting the liquid level of the liquid phase in the tank unit 21 can be used.
- a float type meter or a device that detects the liquid level by light, infrared rays, ultrasonic waves, or the like can be used.
- the liquid phase flow rate measuring device 12 has a configuration including the tank portion 21, it is preferable that the end portion of the liquid phase return line 14 is connected to the bottom portion of the tank portion 21. Further, in this case, the liquid phase return line 14 may be provided with a drain valve 23 that can be automatically opened and closed according to the detection value by the liquid phase amount detecting unit 22. For example, an upper limit value can be set in advance for the value detected by the liquid phase amount detection unit 22, and the drain valve 23 can be opened when the detection value by the liquid phase amount detection unit 22 reaches the upper limit value.
- the configuration of the gas phase flow rate measuring device 13 is not particularly limited, and a measuring device having any configuration can be used.
- a measuring device having any configuration can be used as an example of the gas phase flow rate measuring device 13, a plurality of measuring mechanisms 30 are provided, and each of the measuring mechanisms 30 is provided with a pressure measuring device 31 for measuring the pressure of the gas phase and a downstream side of the pressure measuring device 31.
- a device including a critical nozzle 32 and an on-off valve 33 provided on the downstream side of the critical nozzle 32 can be used.
- the critical nozzle 32 any nozzle such as an orifice nozzle or a Laval nozzle can be used, but it is preferable to use a Laval nozzle for the reason described later.
- the gas phase flow rate measuring device 13 includes six measuring mechanisms 30, but the number is not limited to six, and the vapor phase flow rate measuring device 13 may include only one measuring mechanism 30 or other than six. It may include any number of measuring mechanisms 30 of the above.
- Each measuring mechanism 30 includes a gas phase flow pipe 34 through which the gas phase flows, but the inner diameters of the gas phase flow pipes 34 may be the same, all may be different, or some may be different. The inner diameter of the gas phase flow pipe 34 may be the same, but the other inner diameters may be different.
- the operation of the drain removal monitoring device 10 according to the first embodiment of the present disclosure will be described.
- the sucked fluid includes a liquid phase adhering to the surface of the stationary blade 2, that is, liquid water, and a working fluid of the steam turbine 1 that passes through the stationary blade 2, that is, a gas phase and a liquid phase in steam. Is done.
- the fluid sucked into the internal space 3 flows into the two-phase flow distribution line 16 through the internal space 6 and flows through the two-phase flow distribution line 16.
- the fluid flowing through the two-phase flow distribution line 16 flows into the gas-liquid separation device 11 and is separated into a liquid phase and a gas phase.
- the liquid phase that is, liquid water flows into and is stored in the tank portion 21 of the liquid phase flow rate measuring device 12.
- the gas phase flows through the gas phase distribution line 17 and flows into the gas phase flow rate measuring device 13.
- the liquid phase amount detecting unit 22 detects the transition of the water level of the water in the tank unit 21. Since the amount of water in the tank portion 21 can be calculated from the water level of the water in the tank portion 21, the liquid phase in the fluid sucked into the internal space 3 is calculated based on the value detected by the liquid phase amount detection unit 22. The transition of the flow rate can be obtained.
- the drain valve 23 opens, so that the water in the tank section 21 is drained from the tank section 21 and the steam turbine 1 is specifically provided via the liquid phase return line 14. It flows into a condenser (not shown). In this way, the liquid phase can be automatically drained from the tank portion 21, so that long-term monitoring is possible.
- the gas phase flow rate measuring device 13 the gas phase flows into at least one measuring mechanism 30.
- the number of measuring mechanisms 30 into which the gas phase flows can be adjusted by opening and closing the on-off valve 33 of each measuring mechanism 30, thereby upstream of the slit 4.
- the pressure difference between the downstream and the downstream and the flow rate of the two-phase flow sucked into the internal space 3 through the slit 4 can be adjusted, and the details thereof will be described in the fifth embodiment described later.
- the gas phase flowing into the measuring mechanism 30 flows into the critical nozzle 32 after the pressure is measured by the pressure measuring device 31.
- the gas phase that has flowed into the critical nozzle 32 flows out of the critical nozzle 32 while the channel area is expanded again after the channel area is narrowed. Since the critical nozzle 32 is used in the gas phase flow rate measuring device 13, the gas phase flow rate can be measured only by the pressure on the upstream side of the critical nozzle 32.
- FIG. 2 shows a comparison of pressure changes in the critical nozzle 32 when an orifice nozzle is used as the critical nozzle 32 and when a Laval nozzle is used.
- the pressure P1 at the position L1 before the flow path area is narrowed in the critical nozzle 32 is the pressure measured by the pressure measuring device 31 (see FIG. 1), and is the same for all nozzles. If the pressure at the position L2 after the flow path area is narrowed in the critical nozzle 32 is P2 in the case of the Laval nozzle and P2'in the case of the orifice nozzle, P2 ⁇ P2'.
- the pressure P3 at the position L3 on the sufficiently downstream side is the same for all nozzles.
- the pressure ratios P1 / P2 and P1 / P2' reach the critical pressure ratio, so that the gas phase flow rate can be calculated from the value measured by the pressure measuring device 31.
- the critical pressure ratio may not be reached in the critical nozzle 32.
- P2 ⁇ P2' by using the Laval nozzle as the critical nozzle 32, the possibility of reaching the critical pressure ratio can be increased, so that the reliability of the flow rate measurement of the gas phase can be improved. Therefore, it is preferable to use a Laval nozzle as the critical nozzle 32.
- the liquid in the fluid sucked into the internal space 3 inside the stationary blade 2 through the slit 4 formed in the stationary blade 2 of the steam turbine 1. Since the flow rates of both the phase and the gas phase are measured, it is possible to grasp whether or not the drain removal is properly performed.
- the drain removal monitoring device 10 includes a control device 20 to which each of the liquid phase flow rate measuring device 12 and the gas phase flow rate measuring device 13 is electrically connected. It is preferable to prepare.
- the control device 20 is configured to transmit the liquid phase flow rate and the gas phase flow rate measured by each of the liquid phase flow rate measuring device 12 and the gas phase flow rate measuring device 13.
- the control device 20 presets an upper limit value and a lower limit value regarding the flow rate of the liquid phase and an upper limit value and a lower limit value regarding the flow rate of the gas phase, and the control device 20 sets the transmitted liquid phase and the gas phase, respectively.
- An abnormality in drain removal is detected based on the flow rate of the above and the upper and lower limit values for the respective flow rates of the liquid phase and the gas phase. As long as each of the flow rate of the liquid phase and the flow rate of the gas phase changes between the upper limit value and the lower limit value, the control device 20 determines that the drain removal is properly performed.
- control is performed.
- the device 20 determines that an abnormality has occurred in which the fluid sucked into the internal space of the stationary blade 2 (see FIG. 1) is back-injected from the slit 4 (see FIG. 1). When such anomalies occur, the risk of erosion damage increases.
- the control device 20 operates the on-off valve 33 (see FIG. 1) to increase the pressure ratio between the upstream and downstream of the slit 4 to increase the flow rate of the gas phase. ..
- the flow rate of the gas phase rises and changes between the upper limit value and the lower limit value, and drain removal is appropriately performed.
- control is performed.
- the device 20 determines that the gas path may increase due to deformation of the slit 4 (see FIG. 1) or the like. If such a state is left unattended, the output of the steam turbine 1 (see FIG. 1) decreases.
- the control device 20 operates the on-off valve 33 (see FIG. 1) within a range in which the flow rate of the liquid phase does not fluctuate to reduce the pressure ratio between the upstream and downstream of the slit 4. ..
- the flow rate of the gas phase decreases and changes between the upper limit value and the lower limit value, so that drain removal is appropriately performed.
- control device 20 can automatically detect the occurrence of an abnormality in drain removal and its cause.
- the drain removal monitoring device 10 when the drain removal monitoring device 10 includes the control device 20, an upper limit value regarding the detection value by the liquid phase amount detection unit 22 is set in the control device 20, and the detection value by the liquid phase amount detection unit 22 is set.
- the control device 20 may be configured to open the drain valve 23.
- the drain removal monitoring device according to the second embodiment adds a bypass line for communicating the two-phase flow flow line 16 and the gas phase return line 15 to the first embodiment.
- the same reference numerals as those of the configuration requirements of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
- the drain removal monitoring device 10 includes a bypass line 40 that communicates the two-phase flow distribution line 16 and the gas phase return line 15.
- the bypass line 40 is provided with an on-off valve 41, and the two-phase flow flow line 16 is provided with an on-off valve 18 on the downstream side of the connection position with the bypass line 40.
- Other configurations are the same as those in the first embodiment.
- the on-off valve 18 when measuring the flow rates of the liquid phase and the gas phase, the on-off valve 18 is opened and the on-off valve 41 is closed.
- the on-off valve 18 when it is not necessary to measure the flow rates of the liquid phase and the gas phase, the on-off valve 18 is closed and the on-off valve 41 is opened so that the fluid sucked into the internal space 3 is returned to the bypass line 40 and the gas phase. Since it can be returned to the steam turbine 1 via the line 15, the power consumption for measuring the flow rate can be reduced. Further, it is also possible to maintain the liquid phase flow rate measuring device and the gas phase flow rate measuring device while continuing the operation of the steam turbine 1.
- the drain removal monitoring device adds a first communication line that connects the tank portion 21 and the gas phase return line 15 to the first or second embodiment.
- the third embodiment will be described with the configuration in which the first communication line is added to the configuration of the second embodiment, but the third embodiment may be configured by adding the first communication line to the configuration of the first embodiment. ..
- the same reference numerals as those of the configuration requirements of the second embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
- the drain removal monitoring device 10 includes a first communication line 50 that communicates the tank portion 21 and the gas phase return line 15.
- An on-off valve 51 is provided in the first communication line 50.
- Other configurations are the same as those in the second embodiment.
- the liquid phase separated by the gas-liquid separation device 11 is transferred to the tank section 21, but if the pressure difference is small, the liquid phase moves to the tank section 21. It becomes difficult to be transferred.
- the on-off valve 51 when the on-off valve 51 is opened, the pressure in the tank portion 21 can be made equal to the pressure on the downstream side of the gas phase flow rate measuring device 13 via the first communication line 50. Therefore, the pressure difference can be increased. As a result, the transfer of the liquid phase from the gas-liquid separation device 11 to the tank portion 21 can be promoted, and the reliability of the flow rate measurement of the liquid phase can be improved.
- the drain removal monitoring device according to the fourth embodiment is obtained by adding a second communication line that communicates the gas phase distribution line 17 and the first communication line 50 to the third embodiment.
- the same reference numerals as those of the constituent requirements of the third embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
- the drain removal monitoring device 10 includes a second communication line 60 that communicates the gas phase distribution line 17 and the first communication line 50.
- the second communication line 60 is provided with an on-off valve 61.
- Other configurations are the same as those in the third embodiment.
- the liquid phase staying in the gas phase distribution line 17 can be transferred to the tank portion 21 via the second communication line 60, so that the flow rate measurement of the gas phase is reliable.
- the sex can be improved.
- the drain removal monitoring device according to the fifth embodiment has a plurality of stationary blades 2 to be measured with respect to any one of the first to fourth embodiments.
- the fifth embodiment will be described in which the configuration of the first embodiment has a plurality of stationary blades 2 to be measured, but the configuration of any of the second to fourth embodiments has a plurality of the stationary blades 2 to be measured.
- the fifth embodiment may be configured.
- the same reference numerals as those of the constituent requirements of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
- the upstream end of the two-phase flow flow line 16 branches into four branch pipes 16a, 16b, 16c, 16d, respectively.
- On-off valves 71a, 71b, 71c, 71d are provided in the branch pipe.
- the two-phase flow distribution line 16 is provided with an on-off valve 18.
- Each of the branch pipes 16a, 16b, 16c, 16d has an internal space 6a, 6b, 6c formed in a diaphragm 5a, 5b, 5c, 5d to which each of four different stationary blades 2a, 2b, 2c, 2d is connected.
- the two-phase flow flow line 16 has the internal space 6a.
- 6b, 6c, 6d and the branch pipes 16a, 16b, 16c, 16d communicate with each of the internal spaces 3a, 3b, 3c, 3d and the gas-liquid separation device 11.
- the configuration in which the upstream end of the distribution line 16 branches into four branch pipes is merely an example, and may be configured to branch into two, three, or even five or more branch pipes. Other configurations are the same as those in the first embodiment.
- the gas phase flow rate measuring device 13 includes six measuring mechanisms 30a, 30b, 30c, 30d, 30e, 30f, and the gas phase flow tubes 34a, 34b, 34c, 34d, 34e, 34f of each measuring mechanism.
- the inner diameters are different, as shown in Table 1, depending on the combination of the open / closed states of the on-off valves 33a, 33b, 33c, 33d, 33e, 33f of each measuring mechanism (the open on-off valves in Table 1 are marked with a circle).
- the flow rate of the two-phase flow sucked from the slits 4a, 4b, 4c, 4d of each stationary blade and the pressure ratio between the upstream and downstream of the slits 4a, 4b, 4c, 4d of each stationary blade are independent. Can be adjusted.
- Table 1 it is assumed that the inner diameters of the gas phase flow tubes 34a, 34b, 34c, 34d, 34e, and 34f are different from each other, and the inner diameters increase in this order.
- the gas phase flow rate measuring device 13 provided with only one measuring mechanism, as shown in FIG. 11, when the flow rate of the gas phase decreases due to the change of the measurement target from the stationary blade 2a to the stationary blade 2b.
- the relationship between the pressure ratio and the flow rate is fixed at one point, and there is a possibility that the flow rate cannot be measured at an appropriate pressure ratio.
- the same pressure ratio is obtained, for example, by combining the open / closed states of the on-off valves 33a, 33b, 33c, 33d, 33e, 33f, as shown in FIG.
- a plurality of measurement targets have been described by taking a plurality of physically separate stationary blades 2a to 2d as an example, but the present invention is not limited to this embodiment.
- the upstream end of the two-phase flow distribution line 16 does not need to be branched into a plurality of branch pipes, and the configuration may be the same as that of the first embodiment.
- the drain removal monitoring device is In the steam turbine (1), the fluid outside the stationary blade (2) is passed through the slit (4) formed on the surface of at least one hollow blade (2) including the internal space (3).
- a drain removal monitoring device (10) for monitoring drain removal performed by sucking into the internal space (3).
- a gas-liquid separation device (11) that separates the fluid sucked into the internal space (3) into a liquid phase and a gas phase.
- a liquid phase flow rate measuring device (12) for measuring the flow rate of the liquid phase separated by the gas-liquid separating device (11), and a liquid phase flow rate measuring device (12).
- a gas phase flow rate measuring device (13) for measuring the flow rate of the gas phase separated by the gas-liquid separating device (11), and a gas phase flow rate measuring device (13).
- a liquid phase return line (14) communicating the liquid phase flow rate measuring device (12) and the steam turbine (1),
- a gas phase return line (15) communicating the gas phase flow rate measuring device (13) and the steam turbine (1) is provided.
- the flow rate of both the liquid phase and the gas phase in the fluid sucked into the internal space of the stationary blade through the slit formed in the stationary blade of the steam turbine is measured, so that the drain is measured. It is possible to grasp whether the removal is performed properly.
- the drain removal monitoring device is the drain removal monitoring device of [1].
- a bypass line (40) that communicates the two-phase flow distribution line (16) and the gas phase return line (15) is provided.
- the fluid sucked into the internal space can be returned to the steam turbine via the bypass line and the gas phase return line. Therefore, the power consumption for flow rate measurement can be reduced. It is also possible to maintain the liquid phase flow rate measuring device and the gas phase flow rate measuring device while continuing the operation of the steam turbine.
- the drain removal monitoring device is the drain removal monitoring device of [1] or [2].
- the liquid phase flow rate measuring device (12) includes a tank portion (21) for storing the liquid phase.
- a first communication line (50) that connects the tank portion (21) and the gas phase return line (15) is provided.
- the liquid phase separated by the gas-liquid separator Due to the pressure difference between the gas-liquid separator and the tank section, the liquid phase separated by the gas-liquid separator is transferred to the tank section, but if the pressure difference is small, it becomes difficult for the liquid phase to be transferred to the tank section.
- the pressure difference can be increased, so that the transfer of the liquid phase from the gas-liquid separation device to the tank portion is promoted, and the reliability of the flow rate measurement of the liquid phase is enhanced. Can be done.
- the drain removal monitoring device is the drain removal monitoring device of [3].
- a gas phase distribution line (17) communicating the gas-liquid separation device (11) and the gas phase flow rate measuring device (13), A second communication line (60) that communicates the gas phase distribution line (17) and the first communication line (50) is provided.
- the liquid phase staying in the gas phase distribution line can be transferred to the tank portion, so that the reliability of the flow rate measurement of the gas phase can be improved.
- the drain removal monitoring device is the drain removal monitoring device according to any one of [1] to [4].
- the gas phase flow rate measuring device (13) includes a plurality of measuring mechanisms (30). Each of the plurality of measuring mechanisms (30) A pressure measuring device (31) for measuring the pressure of the gas phase and A critical nozzle (32) provided on the downstream side of the pressure measuring instrument (31) and It includes the pressure measuring device (31) and an on-off valve (33) provided on the upstream side or the downstream side of the critical nozzle (32).
- the number of measuring mechanisms used for measuring the flow rate of the gas phase can be adjusted by opening and closing the on-off valve of each measuring mechanism.
- the pressure difference and liquid between the upstream and downstream of the slit can be adjusted by adjusting the number of measuring instruments used.
- the flow rate of the gas phase can be appropriately measured by appropriately adjusting the conditions with the flow rate of the two-phase flow including the phase and the gas phase.
- the drain removal monitoring device is the drain removal monitoring device of [5].
- the critical nozzle (32) is a Laval nozzle.
- the critical nozzle in the gas phase flow rate measuring device, it is possible to measure the flow rate of the gas phase only by the pressure on the upstream side of the critical nozzle.
- the critical pressure ratio may not be reached at the critical nozzle.
- the possibility of reaching the critical pressure ratio can be increased by using the Laval nozzle as the critical nozzle, so that the reliability of the gas phase flow rate measurement should be improved. Can be done.
- the drain removal monitoring device is the drain removal monitoring device according to any one of [1] to [6].
- the gas-liquid separation device (11) is a cyclone separator.
- gas-liquid separation can be performed for a wide range of fluid flow rates.
- the drain removal monitoring device is the drain removal monitoring device according to any one of [1] to [7].
- the liquid phase flow rate measuring device (12) is The tank portion (21) for storing the liquid phase and It includes a liquid phase amount detecting unit (22) for detecting the amount of the liquid phase in the tank unit (21).
- the flow rate of the liquid phase can be acquired over time.
- the drain removal monitoring device is the drain removal monitoring device of [8].
- the liquid phase return line (14) is connected to the tank portion (21) and is connected to the tank portion (21).
- the liquid phase return line (14) is provided with a drain valve (23) configured to open when the detected value by the liquid phase amount detecting unit (22) reaches a preset upper limit value. ..
- the liquid phase in the tank part when the amount of the liquid phase in the tank part reaches the upper limit, the liquid phase can be automatically drained from the tank part, so that long-term monitoring is possible.
- the drain removal monitoring device is the drain removal monitoring device according to any one of [1] to [9].
- a control device (20) for transmitting the flow rate of the liquid phase and the flow rate of the gas phase measured by the liquid phase flow rate measuring device (12) and the gas phase flow rate measuring device (13) is provided.
- the control device (20) is preset with an upper limit value and a lower limit value relating to the flow rate of the liquid phase and an upper limit value and a lower limit value relating to the flow rate of the gas phase.
- the control device (20) includes the flow rates of the liquid phase and the gas phase transmitted from each of the liquid phase flow rate measuring device (12) and the gas phase flow rate measuring device (13), and the liquid phase and the gas phase.
- the abnormality of drain removal is detected based on the upper limit value and the lower limit value for each flow rate of the gas phase.
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- General Engineering & Computer Science (AREA)
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Abstract
Description
本願は、2020年5月20日に日本国特許庁に出願された特願2020-87905号に基づき優先権を主張し、その内容をここに援用する。
<本開示の実施形態1に係るドレン除去監視装置の構成>
図1に示されるように、実施形態1に係るドレン除去監視装置10は、蒸気タービン1において、内部空間3を含む中空状の少なくとも1つの静翼2の表面に形成されたスリット4を介して、静翼2の外部の流体を内部空間3に吸い込むことによって行われるドレン除去を監視するためのものである。静翼2が接続されるダイヤフラム5は、内部空間6を含む中空状に構成され、内部空間6と内部空間3とは互いに連通している。尚、蒸気タービン1は、図1に図示されていないが、静翼2を含むタービンと、タービン出口排気車室と、復水器車室とを備えている。
次に、本開示の実施形態1に係るドレン除去監視装置10の動作を説明する。蒸気タービン1の運転中、スリット4を介して流体が内部空間3へ吸い込まれる。ここで、吸い込まれる流体には、静翼2の表面に付着した液相、すなわち液体の水や、静翼2を通過する蒸気タービン1の作動流体、すなわち蒸気中の気相及び液相が含まれる。内部空間3へ吸い込まれた流体は、内部空間6を介して二相流流通ライン16に流入し、二相流流通ライン16を流通する。
次に、液相流量測定装置12及び気相流量測定装置13のそれぞれによって測定された液相及び気相の流量からドレン除去の異常を診断する例を説明する。このような診断を行うために、図3に示されるように、ドレン除去監視装置10は、液相流量測定装置12及び気相流量測定装置13のそれぞれが電気的に接続された制御装置20を備えることが好ましい。
次に、実施形態2に係るドレン除去監視装置について説明する。実施形態2に係るドレン除去監視装置は、実施形態1に対して、二相流流通ライン16と気相戻りライン15とを連通するバイパスラインを追加したものである。尚、実施形態2において、実施形態1の構成要件と同じものは同じ参照符号を付し、その詳細な説明は省略する。
次に、実施形態3に係るドレン除去監視装置について説明する。実施形態3に係るドレン除去監視装置は、実施形態1又は2に対して、タンク部21と気相戻りライン15とを連通する第1連通ラインを追加したものである。以下では、実施形態2の構成に第1連通ラインを追加した構成で実施形態3を説明するが、実施形態1の構成に第1連通ラインを追加することによって実施形態3を構成してもよい。尚、実施形態3において、実施形態2の構成要件と同じものは同じ参照符号を付し、その詳細な説明は省略する。
次に、実施形態4に係るドレン除去監視装置について説明する。実施形態4に係るドレン除去監視装置は、実施形態3に対して、気相流通ライン17と第1連通ライン50とを連通する第2連通ラインを追加したものである。尚、実施形態4において、実施形態3の構成要件と同じものは同じ参照符号を付し、その詳細な説明は省略する。
次に、実施形態5に係るドレン除去監視装置について説明する。実施形態5に係るドレン除去監視装置は、実施形態1~4のいずれかに対して、測定対象の静翼2を複数にしたものである。以下では、実施形態1の構成に測定対象の静翼2を複数にした構成で実施形態5を説明するが、実施形態2~4のいずれかの構成に測定対象の静翼2を複数にして実施形態5を構成してもよい。尚、実施形態5において、実施形態1の構成要件と同じものは同じ参照符号を付し、その詳細な説明は省略する。
図10に示されるように、本開示の実施形態5に係るドレン除去監視装置10では、二相流流通ライン16の上流端が4つの分岐管16a,16b,16c,16dに分岐し、それぞれの分岐管に開閉弁71a,71b,71c,71dが設けられている。二相流流通ライン16には開閉弁18が設けられている。分岐管16a,16b,16c,16dのそれぞれは、異なる4つの静翼2a,2b,2c,2dのそれぞれが接続されるダイヤフラム5a,5b,5c,5dに形成された内部空間6a,6b,6c,6dと連通するようにダイヤフラム5a,5b,5c,5dに接続されている。静翼2a,2b,2c,2dのそれぞれの内部空間3a,3b,3c,3dと内部空間6a,6b,6c,6dとは連通しているので、二相流流通ライン16は、内部空間6a,6b,6c,6d及び分岐管16a,16b,16c,16dを介して内部空間3a,3b,3c,3dのそれぞれと気液分離装置11とを連通している。尚、流通ライン16の上流端が4つの分岐管に分岐する構成はあくまでも例示であり、2つ又は3つ、さらには5つ以上の分岐管に分岐した構成であってもよい。その他の構成は実施形態1と同じである。
実施形態5において、気相流量測定装置13が6つの測定機構30a,30b,30c,30d,30e,30fを備え、各測定機構の気相流通管34a,34b,34c,34d,34e,34fの内径が異なる場合、表1に示されるように、各測定機構の開閉弁33a,33b,33c,33d,33e,33fの開閉状態の組み合わせにより(表1において開いている開閉弁に丸印が付されている)、各静翼のスリット4a,4b,4c,4dから吸い込まれる二相流の流量と、各静翼のスリット4a,4b,4c,4dの上流及び下流間の圧力比とを独立して調整できる。尚、表1では、各気相流通管34a,34b,34c,34d,34e,34fの内径がそれぞれ異なり、この順番に内径が大きくなる構成を想定している。
蒸気タービン(1)において、内部空間(3)を含む中空状の少なくとも1つの静翼(2)の表面に形成されたスリット(4)を介して、前記静翼(2)の外部の流体を前記内部空間(3)に吸い込むことによって行われるドレン除去を監視するためのドレン除去監視装置(10)であって、
前記内部空間(3)に吸い込まれた前記流体を液相と気相とに分離する気液分離装置(11)と、
前記気液分離装置(11)によって分離された前記液相の流量を測定する液相流量測定装置(12)と、
前記気液分離装置(11)によって分離された前記気相の流量を測定する気相流量測定装置(13)と、
前記液相流量測定装置(12)と前記蒸気タービン(1)とを連通する液相戻りライン(14)と、
前記気相流量測定装置(13)と前記蒸気タービン(1)とを連通する気相戻りライン(15)と
を備える。
前記内部空間(3)と前記気液分離装置(11)とを連通する二相流流通ライン(16)と、
前記二相流流通ライン(16)と前記気相戻りライン(15)とを連通するバイパスライン(40)と
を備える。
前記液相流量測定装置(12)は、前記液相を貯留するタンク部(21)を含み、
前記タンク部(21)と前記気相戻りライン(15)とを連通する第1連通ライン(50)を備える。
前記気液分離装置(11)と前記気相流量測定装置(13)とを連通する気相流通ライン(17)と、
前記気相流通ライン(17)と前記第1連通ライン(50)とを連通する第2連通ライン(60)と
を備える。
前記気相流量測定装置(13)は複数の測定機構(30)を備え、
前記複数の測定機構(30)のそれぞれは、
前記気相の圧力を測定する圧力測定器(31)と、
前記圧力測定器(31)の下流側に設けられた臨界ノズル(32)と、
前記圧力測定器(31)及び前記臨界ノズル(32)の上流側又は下流側に設けられた開閉弁(33)と
を含む。
前記臨界ノズル(32)はラバールノズルである。
前記気液分離装置(11)はサイクロンセパレータである。
前記液相流量測定装置(12)は、
前記液相を貯留するタンク部(21)と、
前記タンク部(21)内の前記液相の量を検出する液相量検出部(22)と
を含む。
前記液相戻りライン(14)は前記タンク部(21)に接続され、
前記液相戻りライン(14)には、前記液相量検出部(22)による検出値が予め設定された上限値に達したら開くように構成された排液弁(23)が設けられている。
前記液相流量測定装置(12)及び前記気相流量測定装置(13)によって測定された前記液相の流量及び前記気相の流量が伝送される制御装置(20)を備え、
前記制御装置(20)には、前記液相の流量に関する上限値及び下限値と、前記気相の流量に関する上限値及び下限値とが予め設定されており、
前記制御装置(20)は、前記液相流量測定装置(12)及び前記気相流量測定装置(13)のそれぞれから伝送される前記液相及び前記気相それぞれの流量と、前記液相及び前記気相のそれぞれの流量に関する前記上限値及び前記下限値とに基づいて、前記ドレン除去の異常を検知する。
2 静翼
3 内部空間
4 スリット
10 ドレン除去監視装置
11 気液分離装置
12 液相流量測定装置
13 気相流量測定装置
14 液相戻りライン
15 気相戻りライン
16 二相流流通ライン
20 制御装置
21 タンク部
22 液相量検出部
23 排液弁
30 測定機構
31 圧力測定器
32 臨界ノズル
33 開閉弁
40 バイパスライン
50 第1連通ライン
60 第2連通ライン
Claims (10)
- 蒸気タービンにおいて、内部空間を含む中空状の少なくとも1つの静翼の表面に形成されたスリットを介して、前記静翼の外部の流体を前記内部空間に吸い込むことによって行われるドレン除去を監視するためのドレン除去監視装置であって、
前記内部空間に吸い込まれた前記流体を液相と気相とに分離する気液分離装置と、
前記気液分離装置によって分離された前記液相の流量を測定する液相流量測定装置と、
前記気液分離装置によって分離された前記気相の流量を測定する気相流量測定装置と、
前記液相流量測定装置と前記蒸気タービンとを連通する液相戻りラインと、
前記気相流量測定装置と前記蒸気タービンとを連通する気相戻りラインと
を備えるドレン除去監視装置。 - 前記内部空間と前記気液分離装置とを連通する二相流流通ラインと、
前記二相流流通ラインと前記気相戻りラインとを連通するバイパスラインと
を備える、請求項1に記載のドレン除去監視装置。 - 前記液相流量測定装置は、前記液相を貯留するタンク部を含み、
前記タンク部と前記気相戻りラインとを連通する第1連通ラインを備える、請求項1または2に記載のドレン除去監視装置。 - 前記気液分離装置と前記気相流量測定装置とを連通する気相流通ラインと、
前記気相流通ラインと前記第1連通ラインとを連通する第2連通ラインと
を備える、請求項3に記載のドレン除去監視装置。 - 前記気相流量測定装置は複数の測定機構を備え、
前記複数の測定機構のそれぞれは、
前記気相の圧力を測定する圧力測定器と、
前記圧力測定器の下流側に設けられた臨界ノズルと、
前記圧力測定器及び前記臨界ノズルの上流側又は下流側に設けられた開閉弁と
を含む、請求項1~4のいずれか一項に記載のドレン除去監視装置。 - 前記臨界ノズルはラバールノズルである、請求項5に記載のドレン除去監視装置。
- 前記気液分離装置はサイクロンセパレータである、請求項1~6のいずれか一項に記載のドレン除去監視装置。
- 前記液相流量測定装置は、
前記液相を貯留するタンク部と、
前記タンク部内の前記液相の量を検出する液相量検出部と
を含む、請求項1~7のいずれか一項に記載のドレン除去監視装置。 - 前記液相戻りラインは前記タンク部に接続され、
前記液相戻りラインには、前記液相量検出部による検出値が予め設定された上限値に達したら開くように構成された排液弁が設けられている、請求項8に記載のドレン除去監視装置。 - 前記液相流量測定装置及び前記気相流量測定装置によって測定された前記液相の流量及び前記気相の流量が伝送される制御装置を備え、
前記制御装置には、前記液相の流量に関する上限値及び下限値と、前記気相の流量に関する上限値及び下限値とが予め設定されており、
前記制御装置は、前記液相流量測定装置及び前記気相流量測定装置のそれぞれから伝送される前記液相及び前記気相それぞれの流量と、前記液相及び前記気相のそれぞれの流量に関する前記上限値及び前記下限値とに基づいて、前記ドレン除去の異常を検知する、請求項1~9のいずれか一項に記載のドレン除去監視装置。
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CN202180020925.0A CN115279993A (zh) | 2020-05-20 | 2021-05-13 | 废水排放监视装置 |
DE112021001297.5T DE112021001297B4 (de) | 2020-05-20 | 2021-05-13 | Einrichtung zur überwachung einer abflussentfernung |
US17/921,157 US20230243273A1 (en) | 2020-05-20 | 2021-05-13 | Drain removal monitoring equipment |
KR1020227037440A KR20220156632A (ko) | 2020-05-20 | 2021-05-13 | 드레인 제거 감시 장치 |
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JP (1) | JP7369089B2 (ja) |
KR (1) | KR20220156632A (ja) |
CN (1) | CN115279993A (ja) |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0326802A (ja) * | 1989-06-23 | 1991-02-05 | Hitachi Ltd | 蒸気タービンの静翼装置 |
JPH1151732A (ja) * | 1997-08-06 | 1999-02-26 | Chinetsu Gijutsu Kaihatsu Kk | 噴気仮測定試験設備 |
JP2014040803A (ja) * | 2012-08-23 | 2014-03-06 | Hitachi Ltd | 蒸気タービンの静翼構造及び蒸気タービン |
JP2014055577A (ja) * | 2012-09-14 | 2014-03-27 | Hitachi Ltd | 蒸気タービン静翼及び蒸気タービン |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62157206A (ja) | 1985-12-29 | 1987-07-13 | Toshiba Corp | 蒸気タ−ビンの水分排除装置 |
JPH0441908A (ja) | 1990-06-01 | 1992-02-12 | Hitachi Ltd | 蒸気タービンの運転制御システム |
CN207454045U (zh) * | 2017-12-01 | 2018-06-05 | 济南玮泉生物发电有限公司 | 凉水塔势能回收利用系统 |
JP7284472B2 (ja) | 2018-11-15 | 2023-05-31 | 株式会社青井黒板製作所 | 照明装置のケーブル押さえ |
-
2020
- 2020-05-20 JP JP2020087905A patent/JP7369089B2/ja active Active
-
2021
- 2021-05-13 KR KR1020227037440A patent/KR20220156632A/ko not_active Application Discontinuation
- 2021-05-13 CN CN202180020925.0A patent/CN115279993A/zh active Pending
- 2021-05-13 DE DE112021001297.5T patent/DE112021001297B4/de active Active
- 2021-05-13 US US17/921,157 patent/US20230243273A1/en active Pending
- 2021-05-13 WO PCT/JP2021/018215 patent/WO2021235314A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0326802A (ja) * | 1989-06-23 | 1991-02-05 | Hitachi Ltd | 蒸気タービンの静翼装置 |
JPH1151732A (ja) * | 1997-08-06 | 1999-02-26 | Chinetsu Gijutsu Kaihatsu Kk | 噴気仮測定試験設備 |
JP2014040803A (ja) * | 2012-08-23 | 2014-03-06 | Hitachi Ltd | 蒸気タービンの静翼構造及び蒸気タービン |
JP2014055577A (ja) * | 2012-09-14 | 2014-03-27 | Hitachi Ltd | 蒸気タービン静翼及び蒸気タービン |
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KR20220156632A (ko) | 2022-11-25 |
JP7369089B2 (ja) | 2023-10-25 |
US20230243273A1 (en) | 2023-08-03 |
DE112021001297B4 (de) | 2024-03-28 |
DE112021001297T5 (de) | 2023-01-26 |
CN115279993A (zh) | 2022-11-01 |
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