JP2008303719A - Device for automatically measuring valve open and close time - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for automatically measuring valve open and close time capable of accurately measuring open and close operation time accompanying an open and close test of a main steam stop valve or the like in power generating facilities. <P>SOLUTION: This device includes; a flip-flop circuit 26 set at start timing of close action by excitation of a solenoid valve driving a main steam stop valve 15 and reset at completion timing of close action by detection of full close of the main steam stop valve 15; a measuring timer 27 measuring time from set to reset of the flip-flop circuit 26; a flip-flop circuit 34 set at start timing of open action by deenergization of the solenoid valve driving the main steam stop valve 15 and reset at completion timing of open action by detection of full open of the main steam stop valve 15; and a measuring timer 35 measuring time from set to reset of the flip-flop circuit 34. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an automatic measuring device for valve opening / closing time, and is particularly useful when applied to the measurement of opening / closing operation time associated with periodic inspection of a main steam stop valve or a reheat steam stop valve in a power generation facility.

  FIG. 2 is a system configuration diagram showing an example of a power generation facility for steam power generation. As shown in the figure, the power generation facility includes a boiler 1, a high-pressure turbine 2, an intermediate-pressure turbine 3, low-pressure turbines 4, 5, a generator 6, a condenser 7, and the like. In such a power generation facility, steam generated in the boiler 1 is supplied to the high-pressure turbine 2 via the two main steam lines 8 and 9, and a part of the steam that has worked in the high-pressure turbine 2 is supplied to the extraction line 10. It is returned to the boiler 1 through. The steam that has been returned to the boiler 1 and reheated is supplied to the intermediate pressure turbine 3 via the two reheat steam lines 11 and 12. The low-pressure turbines 4 and 5 are supplied with steam after working in the intermediate-pressure turbine 3. Thus, the high-pressure turbine 2, the intermediate-pressure turbine 3, and the low-pressure turbines 4 and 5 are rotationally driven, and the generator 6 using these as a prime mover is driven to generate electric power. On the other hand, the steam that has worked in the low-pressure turbines 4 and 5 reaches the condenser 7 where it is condensed to condensate, and is returned to the boiler 1 through the condensate line 14 by driving the condensate pump 13.

  Here, main steam stop valves 15 and 16 are disposed in the main steam lines 8 and 9, respectively, and reheat steam stop valves 17 and 18 are disposed in the reheat steam lines 11 and 12, respectively. At times, the supply of main steam or reheat steam to the high-pressure turbine 2 to the intermediate-pressure turbine 3 is stopped.

  Further, the main steam stop valves 15 and 16 and the reheat steam stop valves 17 and 18 are periodically subjected to an open / close test in order to prevent sticking and maintain a good operating state. Specifically, the solenoid valve that opens and closes the main steam stop valves 15 and 16 and the reheat steam stop valves 17 and 18 is changed from an open state to a closed state by energizing or de-energizing the operation switch (COS). The operation time and the operation time from the closed state to the open state are measured. More specifically, during each operation time, the operator operates the operation switch (COS) and simultaneously presses the stopwatch so that the main steam stop valves 15 and 16 to the reheat steam stop valves 17 and 18 are in a closed state or an open state. The elapsed time during this period is measured by stopping the stopwatch when it is confirmed by a display device such as a lamp.

  FIG. 3 shows one of main steam stop valves 15 and 16 (see FIG. 2 and the same below) respectively disposed in main steam lines 8 and 9 (see FIG. 2 and the same below) which are constituted by two systems. 2 is a block diagram showing an open / close control system related to a certain main steam stop valve 15. FIG. The open / close control system of the remaining main steam stop valve 16 and reheat steam stop valves 17 and 18 (see FIG. 2, the same applies hereinafter) is also configured in the same manner. Therefore, representatively, the opening / closing control system related to the main steam stop valve 15 will be described and replaced with the description of another opening / closing control system.

  As shown in FIG. 3, when the closing operation of the main steam stop valve 15 is selected with the operation switch (COS) (step ST1), the remaining main steam stop valve 16 is fully opened (step ST2). The AND logic of the circuit 21 is established, and its output becomes “1”. As a result, the solenoid valve for driving the main steam stop valve 15 is excited to pressurize a hydraulic drive operating mechanism (not shown) (this part is indicated by a one-dot chain line in the figure that this is the operation of the hydraulic circuit). As a result, the closing operation of the main steam stop valve 15 is started (step ST3). Thus, the green lamp 22 is turned on when the main steam stop valve 15 is fully closed (step ST4).

  In this case, the period from when the operation switch (COS) is selected to close the main steam stop valve 15 to when the green lamp 22 is turned on is the operation time associated with the closing operation. Measuring.

  Incidentally, when the main steam stop valve 15 is fully opened, the red lamp 23 which is an indicator is turned on. Further, in the transition period from when the closing operation of the main steam stop valve 15 is selected with the operation switch (COS) (the red lamp 23 is turned off at this time) to when the green lamp 22 is turned on, the green lamp 22 and red All the lamps 23 are turned off.

  On the other hand, when the operation switch (COS) is returned to the original state (step ST1), the AND logic of the AND circuit 21 is not established regardless of the open / closed state of the remaining main steam stop valve 16, and the AND circuit 21 When the output is inverted by the knot circuit 24, the output becomes “1”. As a result, the solenoid valve for driving the main steam stop valve 15 is de-energized, and the operation mechanism is set to no pressure (this portion is indicated by a one-dot chain line in the drawing indicating the operation of the hydraulic circuit). Thus, the opening operation of the main steam stop valve 15 is started (step ST3). Thus, when the main steam stop valve 15 is fully opened (step ST4), the red lamp 23 which is an indicator is turned on.

  In this case, the period from when the operation switch (COS) is restored to when the red lamp 23 is lit is the operation time associated with the opening operation, and this operation time is measured by a stopwatch.

  Incidentally, the green lamp 22 is turned on when the main steam stop valve 15 is fully closed. In the transition period from the start of the opening operation to the fully closed state, both the green lamp 22 and the red lamp 23 are turned off, as in the case of the closing operation described above.

  Note that Patent Document 1 exists as a publicly known document that discloses a device that detects an operation abnormality of a switchgear. This eliminates the influence on the stroke characteristics due to the fluctuation of the normal operating force of the switchgear, and discloses a highly accurate operation abnormality detection device.

JP-A-5-36327

  However, in the prior art as described above, the operation time required for opening and closing the main steam stop valves 15 and 16 to the reheat steam stop valves 17 and 18 is measured by the stopwatch. Due to the deviation, the measurement value varies at each open / close test, and an accurate measurement result cannot be obtained. In addition, since the operator must perform the operation of the operation switch and the operation of pressing the stopwatch, there is a high possibility that the operation will fail such as forgetting to press the stopwatch.

  As a result, there has been a problem that it is difficult to accurately determine the malfunction of the main steam stop valves 15 and 16 to the reheat steam stop valves 17 and 18 based on the time-series measurement results.

  In view of the above-described prior art, the present invention provides an automatic valve opening / closing time measuring device capable of accurately measuring the opening / closing operation time of a main steam stop valve and the like accompanying an open / close test of the main steam stop valve and the like in a power generation facility. With the goal.

In order to achieve the above object, the first aspect of the present invention provides:
Control is performed so that the closing or opening operation of the valve disposed in the pipe through which the fluid flows is started by excitation of the solenoid valve, and the opening or closing operation of the valve is started reversely by the non-excitation of the solenoid valve. An automatic measuring device for automatically measuring the opening and closing operation time of the valve,
First detection means for detecting a start time of a closing or opening operation by excitation of the solenoid valve;
Second detection means for detecting a closing or opening end point of the valve by detecting a fully closed or fully opened state of the valve;
First measurement means for measuring a time between the start time detected by the first detection means and the end time detected by the second detection means;
Third detecting means for detecting a start time of opening or closing operation by non-excitation of the solenoid valve;
A fourth detecting means for detecting an end point of the opening or closing operation by detecting the fully opened or fully closed state of the valve;
And a second measuring means for measuring a time between the start time detected by the third detecting means and the end time detected by the fourth detecting means. In the measuring device.

The second aspect of the present invention is:
In the automatic measurement device for the valve opening and closing time described in the first aspect,
First alarm generating means for generating an alarm when a time from the start time to the end time of the closing or opening operation exceeds a preset first set value;
And a second alarm generating means for generating an alarm when a time from the start time to the end time of the opening or closing operation exceeds a preset second set value. It is in an automatic measuring device for valve opening and closing time.

The third aspect of the present invention is:
In the automatic measurement apparatus for the valve opening and closing time described in the first or second aspect,
A first time for measuring an operating time margin associated with the closing or opening operation by subtracting an operating time from the start time to the end time of the closing or opening operation from a preset first set value. Margin time measuring means,
A second time for measuring an operating time margin associated with the opening or closing operation by subtracting an operating time from the start time to the end time of the opening or closing operation from a preset second set value. An automatic measuring device for valve opening and closing time, further comprising an allowance time measuring means.

The fourth aspect of the present invention is:
In the automatic measurement device for the valve opening and closing time according to any one of the first to third aspects,
The valve is a main steam stop valve or a reheat steam stop valve disposed in a main steam line or a reheat steam pipe that is a pipe leading to a turbine in a power generation facility. It is in an automatic measuring device.

According to a fifth aspect of the present invention,
In the automatic measurement device for valve opening and closing time according to any one of the first to fourth aspects,
The pipes in which the valves are arranged are configured in two systems, and the closing or opening operation of the valves in one system is made on the condition that the valves in the other system are fully opened or fully closed. It is in the automatic measuring device of the opening and closing time of the valve characterized by this.

The sixth aspect of the present invention is:
In the automatic measurement device for the valve opening and closing time according to any one of the first to fifth aspects,
The first detection means is configured using a set function of the first flip-flop circuit, and the second detection means is configured using a reset function of the first flip-flop circuit,
The third detection means is configured using a set function of the second flip-flop circuit, and the fourth detection means is configured using a reset function of the second flip-flop circuit. It is in the automatic measuring device of the opening and closing time of the valve.

  According to the present invention, the start time and the end time of the valve closing or opening operation are respectively detected, and the elapsed time between them is measured by the first measuring means, and the start time and the end of the valve opening or closing operation are measured. Since each time point is detected and the elapsed time between them can be measured by the second measuring means, the operation time of the valve can be automatically and accurately measured. As a result, it is possible to obtain time-series accurate operation time information, and to provide useful information for maintenance and inspection.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing an automatic valve opening / closing time measuring apparatus according to an embodiment of the present invention together with a main steam stop valve opening / closing control system. As shown in the figure, the present embodiment is applied to the power generation facility shown in FIG. 2, and the open / close control system of the main steam stop valve is the same as FIG. Therefore, in the figure, the same parts as those in FIG. 2 and FIG. Moreover, the automatic measuring device of the opening / closing time regarding the remaining main steam stop valves 16 and the reheat steam stop valves 17 and 18 is similarly configured. Therefore, the automatic measuring device related to the main steam stop valve 15 will be described as a representative to replace the description of other automatic measuring devices.

  As shown in FIG. 1, the AND circuit 21 excites a solenoid valve that drives the main steam stop valve 15 to close at the rise of its output and operates the one-shot circuit 25 to output a one-shot pulse signal S1. The flip-flop circuit 26 is set at the rising edge of the one-shot pulse signal S1.

  Here, when the AND circuit 21 operates the operation switch (COS) of the main steam stop valve 15 to select the close operation of the main steam stop valve 15, the AND steam circuit 21 is on condition that the main steam stop valve 16 is fully opened. The output rises to “1”. As a result, the flip-flop circuit 26 detects the start point of the closing operation of the main steam stop valve 15 by the excitation of the electromagnetic valve by the set function. On the other hand, the flip-flop circuit 26 is reset by a fully closed signal S2 output when the main steam stop valve 15 is fully closed. As a result, the flip-flop circuit 26 detects the end point of the closing operation of the main steam stop valve 15 by the reset function.

  Thus, the flip-flop circuit 26 outputs the closing operation signal S3 representing the interval from the start of the closing operation of the main steam stop valve 15 to the fully closed state.

  The measurement timer 27 measures the closing operation time of the main steam stop valve 15 represented by the time from the rising point to the falling point based on the closing operation signal S3, and sends a closing operation time signal S4 indicating this time. The indication (1) in the figure means the closing operation time of the main steam stop valve 15.

  The on-delay timer 28 delays the rising edge of the closing operation signal S3 for a predetermined time and generates an alarm signal S5. The alarm signal S5 generates an alarm ANN (1). Here, the predetermined delay time DT1 is set to a time (for example, 7 seconds) slightly longer than the standard closing operation time CT (for example, 6 seconds). Accordingly, if the closing operation signal S3 does not fall beyond the delay time DT1, that is, if the closing operation is not completed even after the delay time DT1 has elapsed, it is determined as abnormal and an alarm ANN (1) is issued.

  On the other hand, the memory 29 stores a standard closing operation time CT. The subtracter 30 subtracts the closing operation time indicated by the closing operation time signal S4 from the closing operation time CT stored in the memory 29. Thus, the closing operation margin time is calculated, and the closing operation margin time signal S6 representing this is sent out. The display (2) in the figure represents the closing operation margin time. Here, the closing operation margin time becomes an index indicating that the closing operation is performed more rapidly as the value thereof is larger. Such an index represents the degree of deterioration of each component of the main steam stop valve 15, and can serve as information on the replacement timing of the component.

  With this configuration, the closing operation time required for the closing operation of the main steam stop valve 15 started by closing the operation switch (COS) of the main steam stop valve 15 is automatically measured.

  The AND circuit 31 sets the flip-flop circuit 34 when the AND logic between the one-shot signal S7 output from the one-shot circuit 33 and the fully closed signal S2 indicating that the main steam stop valve 15 is fully closed is established. A set signal S8 is output. Here, the one-shot circuit 33 has no solenoid valve for opening and closing the main steam stop valve 15 by operating the operation switch (COS) (step ST1) and selecting the return (open) operation of the main steam stop valve 15. It operates in the excited state (step ST3). This is because the output of the AND circuit 21 falls to “0” by the return (open) operation of the operation switch (COS), but is inverted by the knot circuit 32 and supplied to the one-shot circuit 33. That is, the flip-flop circuit 34 is set by the set signal S8 when the main steam stop valve 15 is opened by the return (open) operation of the operation switch (COS) when the main steam stop valve 15 is fully closed. The As a result, the flip-flop circuit 34 detects the start point of the opening operation of the main steam stop valve 15 due to the non-excitation of the solenoid valve by the set function. On the other hand, the flip-flop circuit 34 is reset by a fully open signal S9 output when the main steam stop valve 15 is fully opened. As a result, the flip-flop circuit 34 detects the end point of the opening operation of the main steam stop valve 15 by the reset function.

  Thus, the flip-flop circuit 34 outputs the opening operation signal S10 indicating the interval from the start of the opening operation of the main steam stop valve 15 to the fully opened state.

  Based on the opening operation signal S10, the measurement timer 35 measures the opening operation time of the main steam stop valve 15 represented by the time from the rising point to the falling point, and sends an opening operation time signal S11 indicating this time. The indication (3) in the figure means the opening operation time of the main steam stop valve 15.

  The on-delay timer 38 delays the rising of the opening operation signal S10 for a predetermined time and generates an alarm signal S12. The alarm signal S12 generates an alarm ANN (2). Here, the predetermined delay time DT2 is set to a time (for example, 6 seconds) slightly longer than a standard closing operation time CT (for example, 5 seconds). Therefore, if the opening operation signal S10 does not fall beyond the delay time DT2, that is, if the opening operation is not completed even after the delay time DT2 has elapsed, it is determined as abnormal and an alarm ANN (2) is issued.

  On the other hand, the memory 36 stores a standard opening operation time OT. The subtracter 37 subtracts the opening operation time indicated by the opening operation time signal S11 from the opening operation time OT stored in the memory 36. Thus, the open operation allowance time is calculated, and an open operation allowance time signal S13 representing this is transmitted. The display (4) in the figure represents the open operation margin time. Here, similarly to the closing operation allowance time, the opening operation allowance time becomes an index indicating that the opening operation is performed more rapidly as the value is larger. Therefore, such an index can also serve as information on the replacement timing of parts, etc., as representing the degree of deterioration of each part of the main steam stop valve 15.

  With this configuration, the opening operation time required for the opening operation of the main steam stop valve 15 that is started by returning (opening) the operation switch (COS) of the main steam stop valve 15 is automatically measured.

  It should be noted that the alarm generating means including the on-delay timers 28 and 38 in the above embodiment is not necessarily required. However, it is possible to accurately recognize the abnormality of the main steam stop valve 15 by such alarm generation means. Similarly, a margin time measuring means including the memories 29 and 36 and the subtracters 30 and 37 is not necessarily required. However, it is possible to accurately grasp the aging state of the parts and the like constituting the main steam stop valve 15 by such allowance time measuring means.

  Moreover, although the said embodiment is a case where the switching operation time of the main steam stop valve thru | or reheat steam stop valve of power generation equipment is measured, it cannot be overemphasized that this invention is not limited to this. Control is performed so that the closing or opening operation of the valve disposed in the pipe through which the fluid flows is started by excitation of the solenoid valve, and the opening or closing operation of the valve is started reversely by the non-excitation of the solenoid valve. Any valve can be applied without limitation.

  Further, a detecting means for detecting a start time of the closing or opening operation of the valve by excitation of the electromagnetic valve or a detecting means for detecting the closing time of the closing or opening operation by detecting the fully closed or fully opened state of the valve is a flip-flop circuit. It is not limited to the configuration. If such a function can be realized, it can be constituted by other circuit means.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used in the industrial field where manufacturing, sales, operation, and maintenance of power generation facilities are performed.

It is a block diagram which shows the automatic measurement apparatus of the opening / closing time of the main steam stop valve which concerns on embodiment of this invention with the opening / closing control system of the main steam stop valve. It is a system configuration figure showing an example of power generation equipment of steam power generation. It is a block diagram which shows the opening / closing control system of the main steam stop valve concerning a prior art.

Explanation of symbols

15, 16 Main steam stop valve 21, 31 AND circuit 24, 32 Knot circuit 25, 33 One shot circuit 26, 34 Flip-flop circuit 27, 35 Measurement timer 28, 38 On-delay timer 29, 36 Memory 30, 37 Subtractor

Claims (6)

Control is performed so that the closing or opening operation of the valve disposed in the pipe through which the fluid flows is started by excitation of the solenoid valve, and the opening or closing operation of the valve is started reversely by the non-excitation of the solenoid valve. An automatic measuring device for automatically measuring the opening and closing operation time of the valve,
First detection means for detecting a start time of a closing or opening operation by excitation of the solenoid valve;
Second detection means for detecting a closing or opening end point of the valve by detecting a fully closed or fully opened state of the valve;
First measurement means for measuring a time between the start time detected by the first detection means and the end time detected by the second detection means;
Third detecting means for detecting a start time of opening or closing operation by non-excitation of the solenoid valve;
A fourth detecting means for detecting an end point of the opening or closing operation by detecting the fully opened or fully closed state of the valve;
And a second measuring means for measuring a time between the start time detected by the third detecting means and the end time detected by the fourth detecting means. measuring device. In the automatic measuring device of the valve opening and closing time according to claim 1,
First alarm generating means for generating an alarm when a time from the start time to the end time of the closing or opening operation exceeds a preset first set value;
And a second alarm generating means for generating an alarm when a time from the start time to the end time of the opening or closing operation exceeds a preset second set value. Automatic measuring device for valve opening and closing time. In the automatic measuring device of the valve opening and closing time according to claim 1 or claim 2,
A first time for measuring an operating time margin associated with the closing or opening operation by subtracting an operating time from the start time to the end time of the closing or opening operation from a preset first set value. Margin time measuring means,
A second time for measuring an operating time margin associated with the opening or closing operation by subtracting an operating time from the start time to the end time of the opening or closing operation from a preset second set value. An automatic measuring device for valve opening and closing time, further comprising a margin time measuring means. In the automatic measuring device of the valve opening and closing time according to any one of claims 1 to 3,
The valve is a main steam stop valve or a reheat steam stop valve disposed in a main steam line or a reheat steam pipe that is a pipe leading to a turbine in a power generation facility. Automatic measuring device. In the automatic measuring device of the valve opening and closing time according to any one of claims 1 to 4,
The pipes in which the valves are arranged are configured in two systems, and the closing or opening operation of the valves in one system is made on the condition that the valves in the other system are fully opened or fully closed. An automatic measuring device for valve opening and closing time. In the automatic measuring device of the valve opening and closing time according to any one of claims 1 to 5,
The first detection means is configured using a set function of the first flip-flop circuit, and the second detection means is configured using a reset function of the first flip-flop circuit,
The third detection means is configured using a set function of the second flip-flop circuit, and the fourth detection means is configured using a reset function of the second flip-flop circuit. Automatic measuring device for valve opening and closing time.

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