CN114893334B - Method and device for determining sealing water leakage of main shaft of water turbine - Google Patents
Method and device for determining sealing water leakage of main shaft of water turbine Download PDFInfo
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- CN114893334B CN114893334B CN202210362021.2A CN202210362021A CN114893334B CN 114893334 B CN114893334 B CN 114893334B CN 202210362021 A CN202210362021 A CN 202210362021A CN 114893334 B CN114893334 B CN 114893334B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 314
- 238000007789 sealing Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010248 power generation Methods 0.000 claims description 44
- 238000004364 calculation method Methods 0.000 claims description 29
- 238000012423 maintenance Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 14
- 230000002035 prolonged effect Effects 0.000 description 12
- 238000012545 processing Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 5
- 238000007781 pre-processing Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention provides a method and a device for diagnosing water leakage of a main shaft seal of a water turbine, which can accurately judge the fault of the increased water leakage amount of the main shaft seal in real time, can position the fault problem in time, make decision judgment for whether shutdown maintenance is needed, avoid the safety risk of flooding a guide bearing, reduce unnecessary shutdown and improve the generating benefit of a unit. The method comprises the following steps: acquiring the operation parameters of a top cover drain pump of the water turbine unit, a main shaft sealing water supply pressure value P and a main shaft sealing water supply flow L in the current period, wherein the operation parameters of the top cover drain pump of the water turbine unit comprise the following parameters: the water pump running time T1 and/or the water pump stopping interval time T; when the water pump is operated, the water pump is always operatedAnd/or the pump stopping interval duration of the water pumpThe spindle seal water supply pressure valueThe main shaft seals the water supply flowAnd when the water leakage amount of the main shaft seal of the water turbine is determined to be increased.
Description
Technical Field
The invention relates to the field of hydroelectric generating set equipment fault detection, and in particular relates to a method and a device for determining sealing water leakage of a main shaft of a water turbine.
Background
The main shaft seal of the water turbine is an important protection device of the water turbine, if a problem occurs, the guide bearing has the risk of being flooded, the normal operation of the water turbine is hindered, and the safe and stable operation of the unit is influenced. The judging of the main shaft sealing operation condition at the present stage only carries out early warning through a top cover water level high alarm signal, but the problem of water pump failure, water level meter failure or main shaft sealing water supply failure cannot be specifically judged, and a decision can not be made for judging whether the next defect processing is stopped or not.
Disclosure of Invention
In order to solve the problems, the invention provides the method and the device for determining the sealing water leakage of the main shaft of the water turbine, which can accurately judge the fault of the increased water leakage quantity of the main shaft in real time, can timely position the fault problem, make decision judgment for whether shutdown maintenance is needed, avoid the safety risk of flooding the guide bearing, reduce unnecessary shutdown and improve the generating benefit of a unit.
In a first aspect, a method for determining water leakage of a main shaft seal of a water turbine is provided, comprising: acquiring the operation parameters of a top cover drain pump of the water turbine unit, a main shaft sealing water supply pressure value P and a main shaft sealing water supply flow L in the current period, wherein the operation parameters of the top cover drain pump of the water turbine unit comprise the following parameters: the water pump running time T1 and/or the water pump stopping interval time T; when the water pump is operated, the water pump is always operatedAnd/or the pump stop interval duration/> The main shaft seal water supply pressure value/>The main shaft seals the water supply flow/>When the water turbine main shaft is sealed, water leakage is determined, wherein the/>Said/>Said/>And said/>The average value of each running time length of the water pump, the average value of each pump stopping interval time length of the water pump, the average value of the main shaft sealing water supply pressure and the average value of the main shaft sealing water supply flow in a preset period of the power generation state of the water turbine unit are respectively.
Therefore, through obtaining the operating parameter of the top cover drainage pump, the main shaft seal water supply pressure value P and the main shaft seal water supply flow L of the water turbine unit in the current period, the top cover drainage pump operating time, the pump stopping time, the main shaft seal water supply pressure and the main shaft seal water supply flow change of the water turbine unit in the current period are compared, the problem of faults can be located in time, the power plant is effectively replaced, after the power plant applies for machine unit shutdown, personnel enter a closed and narrow top cover space for checking and judging, faults are found and judged through remote monitoring, disposal measures are formulated, equipment accidents are avoided, unnecessary shutdown delay is avoided, the stability of machine unit operation is improved, the equipment service period is prolonged, and the power generation benefit of the machine unit is further improved.
With reference to the first aspect, in certain implementation manners of the first aspect, the acquiring an operation parameter of a top cover drain pump of the current period water turbine unit includes: acquiring an operation signal of the drainage pump and a power generation state signal of the water turbine unit in the current period; and determining the water pump operation duration T1 and/or the water pump stopping interval duration T according to the operation signal of the water pump and the power generation state signal of the water turbine unit.
With reference to the first aspect, in certain implementation manners of the first aspect, the method further includes: calculating the water turbine unit within a preset periodSaid/>Said/>And said/>Is used as a reference to the value of (a),
Wherein,
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
With reference to the first aspect, in certain implementations of the first aspect, the value of a is 1.1, the value of B is 0.9, the value of C is 0.9, and the value of D is 0.9.
In a second aspect, a device for determining water leakage of a main shaft seal of a water turbine is provided, comprising: the transceiver is used for acquiring the operation parameters of the top cover drain pump, the main shaft sealing water supply pressure value P and the main shaft sealing water supply flow L of the water turbine unit in the current period, wherein the operation parameters of the top cover drain pump of the water turbine unit comprise the following parameters: the water pump running time T1 and/or the water pump stopping interval time T; a processor for controlling the water pump to operate at a constant timeAnd/or the pump stop interval duration/>The main shaft seal water supply pressure value/>The main shaft seals the water supply flowWhen the water turbine main shaft is sealed, water leakage is determined, wherein the/>Said/>Said/>And said/>The average value of each running time length of the water pump, the average value of each pump stopping interval time length of the water pump, the average value of the main shaft sealing water supply pressure and the average value of the main shaft sealing water supply flow in a preset period of the power generation state of the water turbine unit are respectively.
With reference to the second aspect, in certain implementations of the second aspect, the transceiver is specifically configured to: acquiring an operation signal of the drainage pump and a power generation state signal of the water turbine unit in the current period; the processor is specifically configured to: and determining the water pump operation duration T1 and/or the water pump stopping interval duration T according to the operation signal of the water pump and the power generation state signal of the water turbine unit.
With reference to the second aspect, in certain implementations of the second aspect, the processor is further configured to: calculating the water turbine unit within a preset periodSaid/>Said/>And said/>Is used as a reference to the value of (a),
Wherein,
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
With reference to the second aspect, in certain implementations of the second aspect, the value of a is 1.1, the value of B is 0.9, the value of C is 0.9, and the value of D is 0.9.
Drawings
FIG. 1 is a schematic flow chart of a method for determining sealing water leakage of a main shaft of a water turbine according to an embodiment of the invention;
FIG. 2 is a schematic block diagram of a method for determining sealing water leakage of a main shaft of a water turbine according to an embodiment of the present invention;
FIG. 3 is a graph of a trend of the running time of the pump No.1 for top cover drainage provided by the embodiment of the invention;
FIG. 4 is a graph of a trend of the running time of the pump No. 2 for top cover drainage provided by the embodiment of the invention;
FIG. 5 is a plot of the variation of the pump-off interval time trend of the top cover drain pump provided by an embodiment of the invention;
FIG. 6a is a flow variation time scatter plot provided by an embodiment of the present invention;
FIG. 6b is a plot of pressure change versus time provided by an embodiment of the present invention;
FIG. 7 is a scatter plot of the results of the process of increasing spindle seal leakage provided by an embodiment of the present invention;
fig. 8 is a schematic block diagram of an apparatus provided by an embodiment of the present invention.
Detailed Description
For a clearer understanding of the embodiments of the present invention, a brief description will first be given of the working principle of the main shaft seal of the hydraulic turbine. The working principle of the main shaft seal of the water turbine is that the lower cavity of the sealing block is filled with pressure cleaning water, so that the sealing block floats up against the self weight and is supported and fixed on a rotating ring on the main shaft. The rotating ring is fixed on the main shaft and rotates along with the main shaft, the sealing block is arranged in the piston seat, when the lower cavity of the sealing block is pressureless, the sealing block can fall to the bottom by self weight, when the lower cavity of the piston is filled with pressurized water, the sealing block rises to the top end under the action of water pressure, so that water leakage flow between the top cover and the main shaft is blocked, only a small part of water flow leaks out, and the main shaft is sealed to have a sealing effect. When the main shaft sealing water supply system fails, the condition of insufficient sealing water supply water pressure or insufficient flow rate can cause that the main shaft sealing cannot be normally jacked up, the main shaft sealing cannot play a role in sealing, and the failure of increasing the water leakage amount can further cause the safety risk of the flooding guide bearing.
The judging of the main shaft sealing operation condition at the present stage only carries out early warning through a top cover water level high alarm signal, but the problem of water pump failure, water level meter failure or main shaft sealing water supply failure cannot be specifically judged, and a decision can not be made for judging whether the next defect processing is stopped or not.
It should be understood that in the generating state of the turbine unit, when the unit is operating normally, the main shaft seal water supply system works normally, the main shaft seal water leakage amount is constant, and because the starting and stopping water level constant value of the top cover drainage pump is constant, the single starting time duration of the top cover drainage pump is constant, the stopping time interval duration of the top cover drainage pump is also constant, and the main shaft seal water flow and the pressure analog value are also stable.
If the main shaft sealing water supply system fails, the main shaft sealing water supply pressure is reduced or the flow is reduced, and the main shaft sealing water supply system is insufficient for supporting and jacking the main shaft sealing normally, so that the main shaft sealing water leakage is increased, the single running time of the water pump is prolonged due to the increase of the main shaft sealing water leakage, and meanwhile, the pump stopping interval time of the top cover water pump is shortened.
However, the running time of the top cover water pump is prolonged due to various reasons, such as performance degradation, efficiency degradation, water leakage of the top cover water pipe, and longer starting and stopping position interval of the top cover water pump, and the pumping time of the top cover water pump is prolonged.
Likewise, the reason for shortening the interval time of stopping the top cover water pump is also many, such as water leakage of the top cover water pipe, shortening of the start-stop interval of the top cover water pump, and the like, and the interval time of stopping the top cover water pump is shortened.
In summary, when the running time of the top cover water pump is prolonged and the pump stopping interval time of the top cover water pump is shortened, two possible main reasons are that the top cover water pipe leaks or the main shaft sealing leakage amount is increased, if the top cover water pipe leaks, the main shaft sealing water supply flow and the main shaft sealing water supply pressure cannot be changed, so that the main shaft sealing water supply pressure or the water supply flow is introduced to serve as an auxiliary criterion, and whether the main shaft sealing water supply system fault causes the problem of the main shaft sealing water leakage amount increase can be accurately judged.
In view of the above, the invention provides a method and a device for determining the increase of the sealing water leakage of a main shaft of a water turbine, which are used for calculating and analyzing the running time, the stopping time and the main shaft sealing pressure and flow change trend of a water pump through remote data of a unit, judging the increase fault of the sealing water leakage of the main shaft in real time, and timely positioning the fault problem, making decision judgment for whether to stop maintenance or not, and making disposal measures, so that the safety risk of flooding a guide bearing is avoided, unnecessary stop defect is reduced, and the generating benefit of the unit is improved.
The technical scheme of the invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic flow chart of a method 100 for determining hydraulic turbine main shaft seal leakage according to an embodiment of the present invention. As shown in fig. 1, the method includes:
step S110, obtaining operation parameters of a top cover drain pump of a water turbine unit, a main shaft sealing water supply pressure value P and a main shaft sealing water supply flow L in the current period, wherein the operation parameters of the top cover drain pump of the water turbine unit comprise the following parameters: the water pump running time T1 and/or the water pump stopping interval time T;
step S120, when the water pump is running, the water pump is always in operation And/or the pump stop interval duration/>The main shaft seal water supply pressure value/>The main shaft seals the water supply flow/>When in use, the sealing water leakage quantity of the main shaft of the water turbine is determined,
Wherein the saidSaid/>Said/>And said/>The average value of each running time length of the water pump, the average value of each pump stopping interval time length of the water pump, the average value of the main shaft sealing water supply pressure and the average value of the main shaft sealing water supply flow in a preset period of the power generation state of the water turbine unit are respectively.
Therefore, by acquiring the operation parameters of the top cover drain pump, the main shaft seal water supply pressure value P and the main shaft seal water supply flow L of the water turbine unit in the current period, the water pump is operated frequentlyAnd/or the pump stopping interval duration of the water pumpThe main shaft seal water supply pressure value/>The main shaft seals the water supply flow/>When the main shaft of the water turbine is sealed and leaked, the problem of faults is determined, the problem that the main shaft of the water turbine leaks water in time is effectively solved, after a power plant applies for a machine set to stop, personnel enter a closed and narrow top cover space to carry out inspection and judgment, faults are found and judged through remote monitoring, disposal measures are formulated, equipment accidents are avoided, unnecessary stop delay is avoided, the running stability of the machine set is improved, the service period of equipment is prolonged, and the power generation benefit of the machine set is further improved.
Optionally, the obtaining the operation parameters of the top cover drainage pump of the water turbine unit in the current period includes: acquiring an operation signal of the drainage pump and a power generation state signal of the water turbine unit in the current period; and determining the water pump operation duration T1 and/or the water pump stopping interval duration T according to the operation signal of the water pump and the power generation state signal of the water turbine unit.
Optionally, the method further comprises: calculating the preset time period of the water turbine unitSaid/>Said/>And said/>Is used as a reference to the value of (a),
Wherein,
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
It should be understood that the preset time period may be a time period from the overhaul of the unit to the current time period, or may be a partial time period selected from the time period from the overhaul of the unit to the current time period, or may be a certain time period after the unit is put into use.
To further explain how to calculate theSaid/>Said/>And said/>The preset period of time is assumed to be the time from the overhaul of the unit to the current period of time.
Specifically, calculating and counting each running time length of the water pump in the power generation state according to the unit power generation state from the unit maintenance to the current period and the water pump running signal, and calculating an average value of each running time length of the water pump according to each running time length of the water pump;
Calculating and counting the interval time of each pump stop of the water pump in the power generation state according to the unit power generation state and the top cover drainage pump operation signal from the unit maintenance to the current period, and calculating the average value of the interval time of each pump stop of the water pump according to the interval time of each pump stop of the water pump;
and calculating the average value of the pressure and the average value of the flow of the spindle sealing water under the power generation state from the overhauling of the unit to the current period.
Optionally, the value of a is 1.1, the value of B is 0.9, the value of C is 0.9, and the value of D is 0.9.
It should be understood that the A, B, C and D values may also be other values.
In order to more clearly understand the present invention, the technical solution of the present invention will be described with reference to fig. 2. Fig. 2 is a schematic block diagram of a method for determining sealing water leakage of a main shaft of a water turbine according to an embodiment of the present invention. As shown in fig. 2, remote reading unit top cover drain pump operation signal data, unit power generation state signal data, unit main shaft sealing water supply pressure analog quantity data and main shaft sealing water supply analog quantity data; calculating and counting each operation time length of the top cover drainage pump and the average operation time length of the water pump in the power generation state according to the power generation state of the unit and the operation signals of the top cover drainage pump; calculating and counting the interval duration of each pump stopping of the top cover drainage pump in the power generation state and the average value of the interval duration of each pump stopping according to the power generation state of the unit and the running signal of the top cover drainage pump; and calculating the average value of the pressure and the average value of the flow of the sealing water of the main shaft under the power generation state, wherein the process can utilize big data software to perform data preprocessing, screening and calculation. And carrying out logic comparison on each running time length of the drainage pump, the average running time length of the water pump, each interval time length of the drainage pump, the average value of the interval time length of the water pump, the average value of the spindle seal water pressure and the flow average value by utilizing big data software, marking that the running time length of the water pump is prolonged, the interval time of the water pump is shortened, the spindle seal water supply flow is insufficient and the spindle seal water supply pressure is insufficient, carrying out logic AND on the marked results, and determining the spindle seal water leakage fault.
It should be understood that in the embodiment of the present invention, the number of top cover drainage pumps of the water turbine unit is not limited, and may be one or a plurality of top cover drainage pumps, and the present invention is described below by taking two drainage pumps as an example.
(1) And remotely reading signal data such as the running of the No. 1 pump of the top cover drainage pump of the unit, the running of the No. 2 pump of the top cover drainage pump, the main shaft sealing water supply pressure of the unit, the main shaft sealing water supply flow, the generating state of the unit and the like.
(2) And calculating the current pump running time length T1 and pump running time length T2 of the No. 1 pump and the pump stopping interval time length T of the water pump under the power generation state by the power generation state signal, the No. 1 oil pump running signal and the No. 2 oil pump running signal.
(3) Calculating the single running average time length of the No.1 water pump before the maintenance of the unit under the power generation state according to the formulas (1) and (2)Single running average duration of No. Water Pump/>Interval time between water pump stop/>Here, the pump-off interval time/>, can be calculated for the No. 1 and No. 2 pumps, respectively
(4) And (3) remotely reading the analog quantity signal data P of the pressure of the main shaft seal water under the same load section of the unit, and simultaneously calculating the average value of the pressure of the main shaft seal water under the power generation state after the maintenance is finished according to a formula (3)
(5) The analog quantity signal data L of the pressure of the main shaft seal water under the same load section of the unit is remotely read, and meanwhile, the average value of the pressure of the main shaft seal water under the same power generation state after the maintenance is finished is calculated according to a formula (4)
(6) Comparing the calculation results of (2) and (3)Judging that the running time of the pump No. 1 is prolonged;
(7) Comparing the calculation results of (2) and (3) Judging that the running time of the No. 2 pump is prolonged;
(8) Comparing the calculation results of (2) and (3) Judging that the interval time of the pump stop is shortened;
(9) Comparing the calculation results of (4) and (5), Or/>Judging that the main shaft sealing water pressure is insufficient or the main shaft sealing water flow is insufficient;
(10) According to the comparison result, if the comparison result of (6), 7), 8 and 9 is simultaneously satisfied, the fault judgment of the increase of the water leakage amount of the main shaft seal can be made, and the inspection measures and the maintenance treatment plan can be made in time.
The invention is further described below with reference to examples.
Taking the running conditions of a main shaft sealing water supply system and a top cover water drainage system of a No. 6 unit of a certain hydropower plant as an example, actual signal acquisition, calculation and strategy judgment are carried out. The top cover drainage system is provided with 2 sets of electrode liquid level meters and 2 water pumps, the electrode liquid level meters are fixedly arranged, and the fixed values of the start-stop liquid level are fixed. When the water level of the top cover reaches the starting liquid level in normal time, a water pump is started, and when the water level reaches the stopping liquid level, the water pump stops running. 1. The water pump No. 2 rotates after single operation, namely the water pumps No. 1 and No. 2 are started in sequence. The main shaft sealing water supply system is used for supplying water by two main shaft sealing electric valves, and a main shaft sealing pressure transmitter and a flow transmitter are arranged behind the electric valves and used for monitoring the water supply pressure and flow after the electric valves are opened. Before the machine set is started, the main spindle sealing electric valve is automatically started. The detection is carried out according to the following steps:
and remotely reading signal data such as the operation of the top cover water discharge pump No.1, the operation of the top cover water discharge pump No.2, the power generation state of the unit and the like from the overhaul operation of the unit, wherein the total number of the data is 32136, and the data is shown in table 1.
TABLE 1 drainage pump operation signal and unit power generation state
Screening data through a power generation state signal, preprocessing the data by big data software and calculating a formula to calculate the current running time length T1 of the No. 1 pump under the power generation state and the average running time length 1.1 times of the No. 1 pump after maintenanceAltogether 3024 records, comparison/>Satisfying the condition marks the pump number 1 run length as 1, as in table 2.
Table 21 pump run time processing results
Because the data volume is large, table 2 only displays partial data, in order to more intuitively check the change trend of the running time of the pump number 1, the data of table 2 is generated into a time scatter diagram, as shown in fig. 3, and the circled part in the diagram is marked as 1 when the running time is prolonged.
Screening data through a power generation state signal, preprocessing the data by big data software and calculating a formula to calculate the current running time length T2 of the No. 2 pump under the power generation state and the average running time length 1.1 times of the No. 2 pump after maintenanceA total of 2651 records, comparison/>Meeting the condition marks the pump number 2 run time variable length as 1, as in table 3.
Table 32 pump run time processing results
Because the data volume is larger, table 3 only displays partial data, in order to more intuitively check the change trend of the running time of the pump No. 2, the data of table 3 is generated into a time scatter diagram as shown in fig. 4, and the circled part in the diagram is marked as 1 when the running time is prolonged.
Screening data through the power generation state signals, preprocessing the data by big data software and calculating a formula to calculate the average pump stopping time length of the top cover drainage pump after maintenance by 0.9 times the current top cover drainage pump stopping interval time T under the power generation stateA total of 2651 records, comparison/>The satisfaction of the condition marks a2 pump down interval time reduction of 1 as shown in table 4.
Processing result of running interval time length of pump number 41 and pump number 2
Because the data volume is larger, table 4 only displays partial data, in order to more intuitively check the change trend of the pump stop interval duration of 2 pumps, the data of table 4 is generated into a time scatter diagram as shown in fig. 5, and the circled part in the diagram is marked as 1 when the running time is prolonged.
Remote reading the analog quantity signal data P and the water supply flow data L of the main shaft seal water pressure in the generating state of the unit, and calculating the average value of the main shaft seal water pressure in the generating state after the maintenance is finished by using big data softwareAnd spindle seal feed water flow average/>Together 576135 pieces of data, calculate and compare/>Or/>If the main shaft seal water pressure is insufficient or the main shaft seal water flow is insufficient, the main shaft seal water supply is marked as 1, as shown in table 5.
Table 5 spindle seal water pressure data or spindle seal water flow data processing results
Because the data volume is large, the table 5 only displays partial data, and the numerical difference between the flow data and the pressure data is large, in order to more intuitively check the change trend of the spindle sealing water pressure and the flow, the data of the table 5 is used for generating a flow change time scatter diagram and a pressure change time scatter diagram, as shown in fig. 6a and 6b, and the circled part in the diagram is marked as 1 when the spindle sealing water is insufficient in water supply.
And according to the results of the pump running time lengthening mark of No. 1, the pump running time lengthening mark of No. 2, the pump stopping interval time shortening mark and the main shaft sealing water supply shortage mark, logic and judgment are carried out, so that fault judgment of the increase of the main shaft sealing water leakage amount can be made, inspection measures can be made in time, and an overhaul treatment plan can be made. As shown in table 6:
Table 6 treatment results of water leakage increase in main shaft seal of water turbine
Because the data volume is larger, the table 6 only displays partial data, and the data of the table 6 is used for generating a time scatter diagram, as shown in fig. 7, the development trend of the main shaft sealing flow increasing fault can be conveniently seen, and the fault mark of the water leakage volume increasing fault from 12 months to 6 days can be directly seen from graphic software.
The problem that the water leakage quantity is increased is caused by the fact that the spindle sealing water electric valve is blocked after being checked and verified by a contact field technician, the opening degree of the spindle sealing water electric valve is not fully opened in place when the spindle sealing water electric valve is started, and the situation that the spindle sealing water flow and the pressure drop simultaneously occurs due to the fact that the spindle sealing water supply pressure transmitter and the flow transmitter are arranged behind the electric valve is consistent with analyzed data.
The method according to the embodiment of the present application is described in detail above with reference to fig. 1 to 7. The following describes the device according to the embodiment of the present application in detail with reference to fig. 8.
Fig. 2 shows a schematic block diagram of an apparatus 200 according to an embodiment of the application. The apparatus 200 includes: the transceiver 210 is configured to obtain an operation parameter of a top cover drain pump of the hydraulic turbine unit, a main shaft sealing water supply pressure value P, and a main shaft sealing water supply flow L in a current period, where the operation parameter of the top cover drain pump of the hydraulic turbine unit includes the following parameters: the water pump running time T1 and/or the water pump stopping interval time T; a processor 220 for controlling the water pump when the water pump is runningAnd/or the pump stop interval duration/>The main shaft seal water supply pressure value/> The main shaft seals the water supply flow/>When the water turbine main shaft is sealed, water leakage is determined, wherein the/>Said/>Said/>And said/>The average value of each running time length of the water pump, the average value of each pump stopping interval time length of the water pump, the average value of the main shaft sealing water supply pressure and the average value of the main shaft sealing water supply flow in a preset period of the power generation state of the water turbine unit are respectively.
Optionally, the transceiver is specifically configured to: acquiring an operation signal of the drainage pump and a power generation state signal of the water turbine unit in the current period; the processor is specifically configured to: and determining the water pump operation duration T1 and/or the water pump stopping interval duration T according to the operation signal of the water pump and the power generation state signal of the water turbine unit.
Optionally, the processor is further configured to: calculating the water turbine unit within a preset periodSaid/>Said/>And said/>Wherein, in the values of (c), wherein,
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
In one possible implementation, the apparatus 200 may also include a memory 230. In one possible implementation, the memory unit 230 is configured to store instructions. In some possible designs, the processing unit 220 is configured to execute the instructions stored in the storage unit 230, so that the apparatus 200 implements the steps performed in the method 100 as described above.
The processor 220, the memory 230, and the transceiver 210 may communicate with each other through an internal connection path, and the memory 230 may be integrated into the processor 220 or may be provided separately from the processor 220.
It should be appreciated that in an embodiment of the present application, the processor may be a central processing unit (central processing unit, CPU), and the processing unit may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSP).
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A method for determining a water turbine main shaft seal leak, comprising:
Acquiring the operation parameters of a top cover drain pump of the water turbine unit, a main shaft sealing water supply pressure value P and a main shaft sealing water supply flow L in the current period, wherein the operation parameters of the top cover drain pump of the water turbine unit comprise the following parameters: the water pump running time T1 and/or the water pump stopping interval time T; the operation signal of the drainage pump and the power generation state signal of the water turbine unit in the current period;
determining the water pump operation duration T1 and/or the water pump stopping interval duration T according to the operation signal of the water pump and the power generation state signal of the water turbine unit;
When the water pump is operated for a long time And/or the pump stop interval duration/> The main shaft seal water supply pressure value/>The main shaft seals the water supply flow/>When the water turbine main shaft is in sealing water leakage, the water turbine main shaft is determined;
wherein the said Said/>Said/>And said/>Respectively obtaining an average value of each running time length of the water pump, an average value of each pump stopping interval time length of the water pump, an average value of main shaft sealing water supply pressure and an average value of main shaft sealing water supply flow rate of the water turbine unit in a preset period of a power generation state;
The value of A is 1.1, the value of B is 0.9, the value of C is 0.9, and the value of D is 0.9.
2. The method according to claim 1, wherein the method further comprises: calculating the water turbine unit within a preset periodSaid/>Said/>And said/>Is used as a reference to the value of (a),
Wherein the calculation is performed according to the following formula
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
3. A device for determining the sealing leakage of a main shaft of a water turbine, comprising: the transceiver is used for acquiring the operation parameters of the top cover drain pump, the main shaft sealing water supply pressure value P and the main shaft sealing water supply flow L of the water turbine unit in the current period, wherein the operation parameters of the top cover drain pump of the water turbine unit comprise the following parameters: the water pump running time T1 and/or the water pump stopping interval time T; acquiring an operation signal of the drainage pump and a power generation state signal of the water turbine unit in the current period;
The processor is specifically configured to determine the water pump operation duration T1 and/or the water pump stop interval duration T according to the operation signal of the water pump and the power generation state signal of the water turbine unit; for at times when the pump is running And/or the pump stop interval duration/> The main shaft seal water supply pressure value/>The main shaft seals the water supply flow/>When the water turbine main shaft is sealed, water leakage is determined, wherein the/>Said/>Said/>And said/>Respectively obtaining an average value of each running time length of the water pump, an average value of each pump stopping interval time length of the water pump, an average value of main shaft sealing water supply pressure and an average value of main shaft sealing water supply flow rate of the water turbine unit in a preset period of a power generation state;
The value of A is 1.1, the value of B is 0.9, the value of C is 0.9, and the value of D is 0.9.
4. The apparatus of claim 3, wherein the processor is further configured to: calculating the water turbine unit within a preset periodSaid/>Said/>And said/>Wherein the/>, is calculated according to the following formula
The calculation is performed according to the following
The calculation is performed according to the following
The calculation is performed according to the following
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