CN111927572B - System and method for measuring total closing time of steam turbine regulating valve - Google Patents
System and method for measuring total closing time of steam turbine regulating valve Download PDFInfo
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- CN111927572B CN111927572B CN202010562194.XA CN202010562194A CN111927572B CN 111927572 B CN111927572 B CN 111927572B CN 202010562194 A CN202010562194 A CN 202010562194A CN 111927572 B CN111927572 B CN 111927572B
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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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
- 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
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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
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Abstract
The invention relates to a system and a method for measuring total closing time of a steam turbine regulating valve, and belongs to the technical field of steam turbine power generation. The invention comprises a valve body, which is characterized in that: the intelligent control valve comprises a valve body, a connecting rod, an LVDT iron core, an LVDT primary coil, an LVDT secondary coil, a servo card, a data processing unit, a tripping relay and an oscilloscope. The invention can eliminate the delay inertia in the process of AC-DC signal conversion in the existing measurement system, eliminate the misjudgment result that the total closing time of the steam turbine regulating valve exceeds the standard due to the distortion of the measurement data in the existing measurement system, and simultaneously make up for the defects in the prior patent technology.
Description
Technical Field
The invention relates to a system and a method for measuring total closing time of a steam turbine regulating valve, and belongs to the technical field of steam turbine power generation.
Background
According to the requirement of item 4.10 of the turbine regulating control system test guide (DL/T711 and 1999), after the turbine tripping command is sent, the main valve and the regulating valve must be closed quickly within the specified time, so as to avoid the turbine overspeed and even the runaway accident caused by the overlong closing time of the valve. Therefore, the total closing time of the valve of the steam turbine becomes an important index for evaluating the performance of the speed regulating system of the steam turbine, and how to accurately measure the total closing time of the valve of the steam turbine becomes an important technology which is concerned in the power industry.
The existing system for measuring the closing time of the regulating valve of the steam turbine has the following defects:
(1) turbine regulating valves are not normally designed with "fully on" and "fully off" travel switches, and valve closing times must be accounted for by a linear potential differential transformer (LVDT) output signal. The existing measuring system sends alternating potential difference output by the LVDT to a servo card circuit for signal conversion, and outputs 4 mA-20 mA direct current signals as a basis for calculating the closing time of the regulating valve.
(2) According to the requirement of item 4.10 of the turbine regulation control system test guide (DLT/T711-1999), the total closing time T of the turbine valve is the time from the moment when the turbine trip instruction is sent to the full closing of the valve, and consists of valve action delay time T1 and closing time T2, for example, in Chinese patent publication No. CN104912606A, No. 2015, No. 09, month 16, a turbine main valve closing time measuring device and a method thereof are disclosed, which are used for testing the closing time of the turbine main valve. There is also patent literature that a magnetic switch is arranged on a turbine regulating valve for testing the closing time of the regulating valve, and the measuring system can only measure the closing time T2 of the regulating valve, cannot measure the action delay time T1 in the closing process, and cannot obtain the total closing time T of the valve, which does not meet the requirement of item 4.10 of the turbine regulating control system test guide (DLT/T711-1999).
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a system and a method for measuring the total closing time of the steam turbine regulating valve, which have reasonable structural design and high measurement precision.
The technical scheme adopted by the invention for solving the problems is as follows: this total closing time measurement system of steam turbine adjusting valve includes the valve body, and its structural feature lies in: the intelligent control valve comprises a valve body, a connecting rod, an LVDT iron core, an LVDT primary coil, an LVDT secondary coil, a servo card, a data processing unit, a tripping relay and an oscilloscope.
In a preferred embodiment of the present invention, the LVDT secondary coil includes an LVDT secondary coil i and an LVDT secondary coil ii.
In a preferred embodiment of the present invention, the valve body includes a valve element for regulating the flow of the steam and a conduction mechanism for connecting the servomotor.
In a preferred embodiment of the present invention, the servomotor is a turbine regulating valve actuator, and the power source is EH oil pressure.
In a preferred embodiment of the present invention, the LVDT core is made of a magnetic conductive material.
In a preferred embodiment of the present invention, the connecting rod is used to connect the spool and the LVDT core, and the displacement of the spool is transmitted to the LVDT core through the connecting rod.
In a preferred embodiment of the present invention, the LVDT is a linear variable differential transformer, and is used for measuring the opening degree of a steam turbine regulating valve, and includes an LVDT iron core, an LVDT primary coil, an LVDT secondary coil i, and an LVDT secondary coil ii.
A method for measuring the total closing time of a steam turbine regulating valve is characterized by comprising the following steps: the method for measuring the total closing time t of the steam turbine regulating valve by using the system for measuring the total closing time t of the steam turbine regulating valve comprises the following steps:
firstly, connecting alternating potential difference output by an LVDT secondary coil I and an LVDT secondary coil II to a data processing unit;
secondly, the valve opening signal output by the data processing unit is connected into an oscilloscope;
changing an output instruction of the regulating valve within the range of 0-100% according to the mode of 5% step change each time, and confirming the consistency of the valve opening signal and the actual opening of the regulating valve on an oscilloscope;
fourthly, the tripping instruction output by the tripping relay is connected into an oscilloscope;
starting the oscilloscope to determine that the acquisition function of the oscilloscope is normal;
operating a turbine trip button, sending a trip instruction by a trip relay, and recording the trip instruction, the maximum value change time of the opening of the regulating valve and the minimum value arrival time of the opening of the regulating valve by an oscilloscope;
and checking the total closing time t of the steam turbine regulating valve to be t1+ t2 according to the waveform of the oscilloscope, wherein t1 is the time from the moment when the steam turbine tripping instruction is sent to the moment when the maximum opening value of the steam turbine regulating valve changes, and t2 is the time from the moment when the maximum opening value of the steam turbine regulating valve changes to the moment when the minimum opening value of the steam turbine regulating valve reaches.
In a preferred embodiment of the present invention, the servo card is configured to provide an LVDT primary coil excitation signal; the LVDT primary coil is used for generating an alternating magnetic field; the LVDT secondary coil I and the LVDT secondary coil II are used for generating induced potential difference signals in an alternating magnetic field.
According to a preferable scheme of the invention, the data processing unit is used for extracting effective values of alternating potential difference waveforms of the LVDT secondary coil I and the LVDT secondary coil II, generating a valve opening signal and connecting the valve opening signal to an oscilloscope for displaying.
In a preferred embodiment of the present invention, the steam turbine regulating valve opening degree signal output by the data processing unit and the trip instruction sent by the trip relay are simultaneously connected to the oscilloscope.
Compared with the prior art, the invention has the following advantages and effects:
(1) the invention can eliminate the delay inertia in the process of AC-DC signal conversion in the existing measurement system, and avoid the misjudgment result that the total closing time of the steam turbine regulating valve exceeds the standard due to the distortion of the measurement data in the existing measurement system.
(2) The invention can make up the defects in the prior art and can accurately measure the total closing time of the steam turbine regulating valve.
(3) The measuring system of the invention does not need to add accessories, and has simple structure, reliable work, rapid response and high measuring precision.
Drawings
In order to more clearly illustrate the embodiments and/or technical solutions of the present invention, the drawings used in the description of the embodiments and/or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a system for measuring total closing time of a steam turbine regulating valve in an embodiment of the invention.
FIG. 2 is a schematic diagram of waveforms of alternating potential differences of a secondary coil of an LVDT in an embodiment of the present invention, where the abscissa is a number of data acquisition points, a data acquisition period is 0.1ms, and the minimum scale of the abscissa represents a time interval of 1.9 ms; the ordinate is a percentage scale of the measured parameter, the curve 12 range is-1 VDC- +2VDC, and the curve 13 range is-1 VAC- +2 VAC.
FIG. 3 is a waveform diagram displayed by an oscilloscope in an embodiment of the present invention, wherein the abscissa represents the number of data acquisition points, the data acquisition period is 0.1ms, and the minimum scale of the abscissa represents a time interval of 1.9 ms; the ordinate is a percentage scale of the measured parameter, and the time marked on the curve of the opening of the regulating valve is the relative time recorded by the oscilloscope.
Fig. 4 is a schematic diagram of the variation curve of the opening degree of the high-pressure regulating valve GV1 recorded by the prior measuring system.
Fig. 5 is a schematic diagram of the variation curve of the opening degree of the high-pressure regulating valve GV2 recorded by the prior measuring system.
Fig. 6 is a schematic diagram of the variation curve of the opening degree of the high-pressure regulating valve GV3 recorded by the prior measuring system.
Fig. 7 is a schematic diagram of the variation curve of the opening degree of the high-pressure regulating valve GV4 recorded by the prior measuring system.
Reference numerals: the valve comprises a valve body 1, an oil-operated machine 2, a connecting rod 3, an LVDT iron core 4, an LVDT primary coil 5, an LVDT secondary coil I6, an LVDT secondary coil II 7, a servo card 8, a data processing unit 9, a tripping relay 10, an oscilloscope 11, a tripping instruction 12, an alternating potential difference waveform 13, a high-pressure regulating valve GV1 opening variation curve 14, a high-pressure regulating valve GV2 opening variation curve 15, a high-pressure regulating valve GV3 opening variation curve 16 and a high-pressure regulating valve GV4 opening variation curve 17.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, the system for measuring the total closing time of the steam turbine regulating valve in the embodiment includes a valve body 1, an oil-driven machine 2, a connecting rod 3, an LVDT iron core 4, an LVDT primary coil 5, an LVDT secondary coil, a servo card 8, a data processing unit 9, a trip relay 10 and an oscilloscope 11, wherein the LVDT secondary coil includes an LVDT secondary coil i 6 and an LVDT secondary coil ii 7.
The hydraulic servomotor 2 controls the opening of the valve body 1, the connecting rod 3 is connected with the hydraulic servomotor 2 and the LVDT iron core 4, the LVDT primary coil 5 is connected with the servo card 8, the LVDT secondary coil I6 and the LVDT secondary coil II 7 are connected with the data processing unit 9, and the tripping relay 10 and the data processing unit 9 are connected with the oscilloscope 11.
The valve body 1 comprises a valve core for regulating steam flow and a conduction mechanism for connecting the servomotor 2; the servomotor 2 is a steam turbine regulating valve actuating mechanism, and the power source is EH oil pressure; the connecting rod 3 is used for connecting the valve core in the valve body 1 and the LVDT iron core 4; the LVDT is a linear variable differential transformer and is used for measuring the opening of a steam turbine regulating valve, and the LVDT comprises an LVDT iron core 4, an LVDT primary coil 5, an LVDT secondary coil I6 and an LVDT secondary coil II 7; the primary coil 5 generates an alternating magnetic field signal after receiving an excitation signal sent by the servo card 8, an alternating induced potential difference is generated in the LVDT secondary coil I6 and the LVDT secondary coil II 7 after the coupling through the LVDT iron core 4, the induced potential difference is accessed into the data processing unit 9, then an effective value of the waveform of the alternating induced potential difference is extracted, and an opening signal of the regulating valve is generated.
The trip command 12 sent by the trip relay 10 of the steam turbine is a step waveform, as shown by the trip command 12 in fig. 2; the potential difference induced by the LVDT secondary coil I6 and the LVDT secondary coil II 7 is an alternating waveform, as shown by the alternating waveform 13 of the potential difference in FIG. 2. When a tripping command 12 of the steam turbine is sent, the potential difference alternating waveform 13 signals induced by the LVDT secondary coil I6 and the LVDT secondary coil II 7 are delayed for a certain time (namely valve action delay time t)1) Then rapidly decreases, and then after a certain time (i.e. valve closing time t)2) A lower steady value is reached indicating that the regulating valve is fully closed.
The opening degree signal of the regulating valve output by the data processing unit 9 is input into the oscilloscope 11, as shown in fig. 3, an opening degree change curve 14 of the high-pressure regulating valve GV1, an opening degree change curve 15 of the high-pressure regulating valve GV2, an opening degree change curve 16 of the high-pressure regulating valve GV3, and an opening degree change curve 17 of the high-pressure regulating valve GV 4.
When the tripping command 12 is sent out, the oscilloscope 11 records the tripping command 12 and the opening degree change curve of 4 high-pressure regulating valves at the frequency of 10 kHz. From the moment of sending the tripping command 12 to the moment of changing the highest point of the opening of the high-pressure regulating valve, the action delay time t of the high-pressure regulating valve is calculated1(ii) a From the moment of the highest point change of the opening of the high-pressure regulating valve to the moment of the lowest point arrival of the opening of the high-pressure regulating valve, checking the high-pressure regulating valveTime t of operation2Calculating the total closing time t of the high-pressure regulating valve as t1+t2。
The 4.10 item of the decision criteria of Table 7 of the turbine regulating control System test guide (DL/T711 and 1999) is shown in Table 1, and whether the measured total closing time of the turbine regulating valve satisfies the requirements is evaluated according to the criteria in Table 1.
TABLE 1 qualification standard for total closing time of steam turbine regulating valve
| Rated power of unit (MW) | Adjusting valve (ms) | Main steam valve (ms) |
| <100 (including 100) | <500 | <1000 |
| 100 to 200 (including 200) | <500 | <400 |
| 200 to 600 (including 600) | <400 | <300 |
| >600 | <300 | <300 |
The following takes the test data of the total closing time of the high-pressure regulating valve of the turbine of the 660MW unit in a certain thermal power plant as an example to illustrate the beneficial effects of the invention.
1. The total closing time of 4 high-pressure regulating valves of the power plant is measured by using the conventional measuring system, and 4-20 mA valve opening degree signals output by the servo card 8 are connected into the oscilloscope 11 for testing. The test procedure is shown in fig. 4-7, and the single valve measurement data is shown in table 2. The high pressure regulating valve GV2, the high pressure regulating valve GV3, and the high pressure regulating valve GV4 were judged to be out of specification in accordance with the standards of table 1.
TABLE 2 measurement data of existing measurement systems
| Valve name | Delay time t1(ms) | Closing time t2(ms) | Total closing time of valve (ms) | Conclusion |
| GV1 | 57.03 | 82.36 | 139.39 | Qualified |
| GV2 | 41.19 | 310.45 | 351.64 | Fail to be qualified |
| GV3 | 15.84 | 370.65 | 386.49 | Fail to be qualified |
| GV3 | 44.36 | 348.47 | 392.83 | Fail to be qualified |
2. The method is used for measuring the total closing time of 4 high-pressure regulating valves of the power plant, the induced potential difference generated in the LVDT secondary coil I6 and the LVDT secondary coil II 7 is connected into the data processing unit 9, and the oscilloscope 11 is connected for testing after the opening degree signal of the regulating valve is extracted. The test procedure is shown in fig. 3, and the individual valve measurement data is shown in table 3. The total closing time of the high-pressure regulator GV1, the high-pressure regulator GV2, the high-pressure regulator GV3, and the high-pressure regulator GV4 was all judged to be acceptable according to the criteria of table 1.
TABLE 3 measurement data of the invention
| Valve name | Delay time t1(ms) | Closing time t2(ms) | Total closing time of valve (ms) | Conclusion |
| GV1 | 7.2 | 113.9 | 121.1 | Qualified |
| GV2 | 11.0 | 77.2 | 88.2 | Qualified |
| GV3 | 7.6 | 120.5 | 128.1 | Qualified |
| GV3 | 14.6 | 77.8 | 92.4 | Qualified |
3. Compare the prior art measurement system (fig. 4-7) with the present invention (fig. 3). The existing measurement system sends the induced potential difference generated by an LVDT secondary coil I6 and an LVDT secondary coil II 7 into a servo card 8 for AC-DC signal conversion processing, and the arrival time of the minimum value of the opening degree of a regulating valve displayed on an oscilloscope 11 lags behind the actual arrival time of the regulating valve due to the inherent delay inertia of a conversion circuit, so that the measurement data is seriously distorted; according to the invention, the alternating potential difference of the LVDT secondary coil I6 and the LVDT secondary coil II 7 is sent to the data processing unit 9 to extract the effective value of the alternating waveform, no delay inertia exists, the measured data is consistent with the actual action result of the regulating valve, and the misjudgment result of the existing measuring system caused by the distortion of the measured data can be avoided.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (6)
1. A method for measuring the total closing time of the regulating valve of a steam turbine uses a system for measuring the total closing time of the regulating valve of the steam turbine, the total closing time measuring system of the steam turbine regulating valve comprises a valve body (1), an oil-operated machine (2), a connecting rod (3), an LVDT iron core (4), an LVDT primary coil (5), an LVDT secondary coil, a servo card (8), a data processing unit (9), a tripping relay (10) and an oscilloscope (11), the valve body (1) is connected with the servomotor (2), the connecting rod (3) is connected with the servomotor (2) and the LVDT iron core (4), the LVDT primary coil (5) and the LVDT secondary coil are both matched with the LVDT iron core (4), the servo card (8) is connected with an LVDT primary coil (5), the data processing unit (9) is connected with an LVDT secondary coil, the data processing unit (9) and the tripping relay (10) are both connected with the oscilloscope (11); the LVDT secondary coils comprise an LVDT secondary coil I (6) and an LVDT secondary coil II (7); the valve body (1) comprises a valve core for adjusting steam flow and a conducting mechanism for connecting the servomotor (2), and is characterized in that: the steps for measuring the total closing time t of the steam turbine regulating valve are as follows:
firstly, alternating potential difference output by an LVDT secondary coil I (6) and an LVDT secondary coil II (7) is connected to a data processing unit (9);
secondly, a valve opening signal output by the data processing unit (9) is connected into an oscilloscope (11);
changing an output instruction of the regulating valve within the range of 0-100% according to the mode of 5% step change each time, and confirming the consistency of the valve opening signal and the actual opening of the regulating valve on an oscilloscope (11);
fourthly, the tripping instruction (12) output by the tripping relay (10) is connected into the oscilloscope (11);
starting the oscilloscope (11) to determine that the acquisition function of the oscilloscope (11) is normal;
operating a turbine trip button, sending a trip instruction (12) by a trip relay (10), and recording the trip instruction (12), the maximum value change time of the opening of the regulating valve and the minimum value arrival time of the opening of the regulating valve by an oscilloscope (11);
and checking the total closing time t = t1+ t2 of the steam turbine regulating valve according to the waveform of the oscilloscope, wherein t1 is the time from the moment when the steam turbine tripping command (12) is sent to the moment when the maximum opening value of the steam turbine regulating valve changes, and t2 is the time from the moment when the maximum opening value of the steam turbine regulating valve changes to the moment when the minimum opening value of the steam turbine regulating valve reaches.
2. The method of measuring total closing time of a steam turbine governor valve of claim 1, wherein: the servo card (8) is used for providing an excitation signal of the LVDT primary coil (5); the LVDT primary coil (5) is used for generating an alternating magnetic field; and the LVDT secondary coil I (6) and the LVDT secondary coil II (7) are used for generating induced potential difference signals in an alternating magnetic field.
3. The method of measuring total closing time of a steam turbine governor valve of claim 1, wherein: and the data processing unit (9) is used for extracting effective values of alternating potential difference waveforms (13) of the LVDT secondary coil I (6) and the LVDT secondary coil II (7), generating a valve opening signal and connecting the valve opening signal to an oscilloscope (11) for displaying.
4. The method of measuring total closing time of a steam turbine regulating valve according to claim 1, wherein: and the steam turbine regulating valve opening degree signal output by the data processing unit (9) and a tripping instruction (12) sent by the tripping relay (10) are simultaneously connected to the oscilloscope (11).
5. The method of measuring total closing time of a steam turbine regulating valve according to claim 1, wherein: the hydraulic servomotor (2) is a steam turbine regulating valve actuating mechanism, and the power source is EH oil pressure.
6. The method of measuring total closing time of a steam turbine regulating valve according to claim 1, wherein: the LVDT iron core (4) is made of magnetic conductive material.
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