CN110265160B - Method and device for monitoring water level of pressure vessel of nuclear power station - Google Patents
Method and device for monitoring water level of pressure vessel of nuclear power station Download PDFInfo
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- CN110265160B CN110265160B CN201910531694.4A CN201910531694A CN110265160B CN 110265160 B CN110265160 B CN 110265160B CN 201910531694 A CN201910531694 A CN 201910531694A CN 110265160 B CN110265160 B CN 110265160B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/003—Remote inspection of vessels, e.g. pressure vessels
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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
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The application relates to the technical field of nuclear power plant reactor core measuring systems, in particular to a method and a device for monitoring the water level of a pressure vessel of a nuclear power plant. The scheme adopts the effectiveness of the measured value of the narrow-range instrument as the basis of the system output measured value, and compared with the traditional method adopting the main pump feedback signal as the basis of the system output measured value, the method ensures that the water level of the pressure container obtained by the pressure container monitoring method provided by the scheme is more accurate. In addition, when the measured value of the narrow-range instrument is effective, the top of the pressure container does not need to be corrected by using the head loss coefficient of the main pump, the times of overhaul of the system due to the fact that the head loss coefficient of the main pump needs to be readjusted are reduced, and the maintenance cost of the system is further reduced.
Description
Technical Field
The application relates to the technical field of nuclear power station reactor core measuring systems, in particular to a method and a device for monitoring the water level of a pressure vessel of a nuclear power station.
Background
The Core Cooling Monitoring System (CCMS) of a nuclear power plant has the main functions of acquiring temperature/pressure/liquid level signals in a Core, and finally obtaining the state of the Core through calculation, wherein the Core Cooling Monitoring System comprises two main parameters: the core saturation temperature margin and the core liquid level are important parameters for monitoring the core.
At present, the CCMS is used for measuring the liquid level of a reactor core, mainly the water level of a pressure vessel, and the water level of the pressure vessel is measured by calculating after measuring the pressure difference between the top and the bottom of the pressure vessel.
However, the above correction method increases the hardware maintenance cost of the system, and the accuracy of the calculated pressure vessel water level is low.
Disclosure of Invention
Therefore, in order to solve the above technical problems, it is necessary to provide a method, an apparatus, a computer device and a storage medium for monitoring the water level of a pressure vessel in a nuclear power plant, which can effectively improve the calculation accuracy of the water level of the pressure vessel and reduce the hardware maintenance cost.
In a first aspect, a method for monitoring the water level of a pressure vessel of a nuclear power plant comprises the following steps:
judging whether the measured value of the narrow-range instrument is effective or not;
if the measured value of the narrow-range instrument is valid, judging whether the input parameter is valid;
if the input parameters are valid, acquiring a measurement differential pressure equivalent value when the pressure container in the input parameters is filled;
and determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled fully.
In one embodiment, the obtaining the equivalent value of the measured differential pressure when the pressure vessel is full in the input parameter includes:
acquiring the bottom pressure difference of the pressure container, the top pressure difference of the pressure container and the average temperature value of the thermocouple;
and obtaining the equivalent value of the measured differential pressure when the pressure container is fully filled according to the bottom differential pressure of the pressure container, the top differential pressure of the pressure container and the average temperature value of the thermocouple.
In one embodiment, the obtaining the equivalent value of the measured differential pressure when the pressure container is full according to the bottom differential pressure of the pressure container, the top differential pressure of the pressure container and the average temperature value of the thermocouple comprises:
determining the target height of the pressure container according to the average temperature value of the thermocouple, the temperature correction coefficient and the height of the pressure container at the preset temperature;
determining the target top height of the pressure container according to the average temperature value of the thermocouple, the temperature correction coefficient and the top height of the pressure container at the preset temperature;
and obtaining the equivalent value of the measured differential pressure when the pressure container is fully filled according to the target height of the pressure container, the target top height of the pressure container, the top differential pressure of the pressure container and the bottom differential pressure of the pressure container.
In one embodiment, the determining the pressure vessel water level according to the measured differential pressure equivalent when the pressure vessel is full comprises:
and determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled fully, the measured differential pressure value of the pressure container, the steam density of the pressure container and the liquid water density of the pressure container.
In one embodiment, the determining whether the input parameter is valid includes:
judging whether the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple are all effective or not;
if the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple are all effective, determining that the input parameters are effective;
and if any one of the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple is invalid, determining that the input parameter is invalid.
In one embodiment, if the input parameter is invalid, the pressure vessel water level measured at the previous time is used as the pressure vessel water level.
In one embodiment, if the measurement value of the narrow-range meter is invalid, the pressure container water level is determined according to the validity of the measurement value of the wide-range meter.
In one embodiment, determining the pressure vessel water level based on the validity of the wide range meter measurements comprises:
if the measured value of the wide-range meter is valid, determining the water level of the pressure container according to the measured value of the wide-range meter and the measured range of the narrow-range meter;
and if the measured value of the wide-range meter is invalid, taking the water level of the pressure container measured at the last moment as the water level of the pressure container.
In one embodiment, determining the pressure vessel water level based on the measurement of the wide range meter and the measurement range of the narrow range meter comprises:
judging whether the measurement value of the wide-range instrument exceeds the measurement range of the narrow-range instrument;
if the water level exceeds the preset water level, determining a preset water level mandatory value as the water level of the pressure container;
and if the water level does not exceed the preset water level, taking the water level of the pressure container measured at the last moment as the water level of the pressure container.
In a second aspect, a nuclear power plant pressure vessel water level monitoring apparatus, the apparatus comprising:
the first judgment module is used for judging whether the measurement value of the narrow-range instrument is effective or not;
the second judgment module is used for judging whether the input parameters are valid or not if the measured value of the narrow-range instrument is valid;
the acquisition module is used for acquiring a measurement differential pressure equivalent value when the pressure container in the input parameters is filled fully if the input parameters are effective;
and the determining module is used for determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled.
In a third aspect, a computer device includes a memory and a processor, where the memory stores a computer program, and the processor implements the method for monitoring the water level of the pressure vessel in the nuclear power plant according to any one of the embodiments of the first aspect when executing the computer program.
In a fourth aspect, a computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the method for monitoring a water level in a pressure vessel of a nuclear power plant as described in any one of the embodiments of the first aspect.
According to the nuclear power station pressure vessel water level monitoring method and device, the computer equipment and the storage medium, different measuring methods are selected to be executed by judging whether the measured value of the narrow-range instrument is effective, wherein under the condition that the measured value of the narrow-range instrument is effective, the pressure vessel water level measuring device determines the pressure vessel water level according to the measured differential pressure equivalent value when the pressure vessel in the input parameters is full of liquid. In practical application, the effective signal of the measured value of the narrow-range instrument is more stable than the feedback signal of the main pump, and the wrong effective signal can not be output due to system tripping, power failure and the like, so that the scheme adopts the effectiveness of the measured value of the narrow-range instrument as the basis of the system output measured value, and compared with the traditional scheme of adopting the feedback signal of the main pump as the basis of the system output measured value, the pressure container water level measured by the pressure container monitoring method provided by the scheme is more accurate, and errors can not occur. In addition, when the measured value of the narrow-range instrument is effective, the narrow-range instrument is equivalent to 0 or 1 main pump, and in the application scene, the dynamic pressure generated when the fluid in the main pump flows through the reactor core is very small, so that the head loss coefficient of the main pump does not need to be used for correcting the top of the pressure container, the times of overhaul of the system due to the fact that the head loss coefficient of the main pump needs to be readjusted are reduced, and the maintenance cost of the system is further reduced.
Drawings
FIG. 1 is a diagram of an application environment, according to an embodiment;
FIG. 2 is a flow chart of a method for monitoring the water level in a pressure vessel of a nuclear power plant according to an embodiment;
FIG. 3 is a flowchart of one implementation of S103 in the embodiment of FIG. 2;
FIG. 4 is a flowchart of one implementation of S202 in the embodiment of FIG. 3;
FIG. 5 is a flow chart of one implementation of S102 in the embodiment of FIG. 2;
FIG. 6 is a flow chart of a method for monitoring the water level in a pressure vessel of a nuclear power plant according to an embodiment;
FIG. 7 is a flow diagram of one implementation of S501 in FIG. 6;
FIG. 8 is a flow chart of a method for monitoring the water level in a pressure vessel of a nuclear power plant according to an embodiment;
FIG. 9 is a schematic structural diagram of a pressure vessel differential pressure equivalence measuring device according to an embodiment;
FIG. 9A is a schematic structural diagram of a prior art pressure vessel differential pressure equivalent measuring device according to an embodiment;
FIG. 10 is a schematic diagram illustrating an exemplary embodiment of a pressure vessel water level measuring device;
FIG. 10A is a schematic diagram of a prior art apparatus for measuring a water level in a pressure vessel according to an embodiment;
FIG. 11 is a schematic diagram illustrating a nuclear power plant pressure vessel water level monitoring configuration according to an exemplary embodiment;
fig. 12 is a schematic internal structural diagram of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method for monitoring the water level of the pressure vessel of the nuclear power station can be applied to a CCMS (nuclear power station controller system) shown in figure 1, wherein the CCMS comprises the following steps: the pressure vessel pressure difference equivalent value measuring device comprises a pressure vessel pressure difference equivalent value measuring device and a pressure vessel water level measuring device, wherein the output end of the pressure vessel pressure difference equivalent value measuring device is connected with the input end of the pressure vessel water level measuring device. The pressure vessel pressure difference equivalent value measuring device can be but is not limited to various measuring devices, personal computers, laptops, smart phones, tablet computers and the like, and the pressure vessel water level measuring device can be but is not limited to various measuring devices, personal computers, notebooks, smart phones, tablet computers and the like.
The following describes in detail the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems by embodiments and with reference to the drawings. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a flowchart of a nuclear power plant pressure vessel water level monitoring method according to an embodiment, which is executed by the pressure vessel water level measuring apparatus in fig. 1, and relates to a specific process in which the pressure vessel water level measuring apparatus measures the pressure vessel water level according to the validity of the measurement value of the narrow range meter. As shown in fig. 2, the method includes:
s101, judging whether the measurement value of the narrow-range meter is valid.
The present embodiment relates to the step of selecting to perform different measurement methods by judging the validity of the measurement value of the narrow range meter, which is an input signal parameter of the pressure vessel water level measuring apparatus, and which can be expressed by numerical values, for example, if the measurement value of the narrow range meter is valid, the validity of the measurement value of the narrow range meter is set to 1, and if the measurement value of the narrow range meter is invalid, the validity of the measurement value of the narrow range meter is set to 0. For convenience of later explanation of the working principle of the pressure container water level measuring device, the present application provides a representation method and contents of a plurality of input signal parameters of the pressure container water level measuring device, and output signal parameters of the pressure container water level measuring device, such as a plurality of input signal parameters of the pressure container water level measuring device listed in table 1, and a plurality of output signal parameters of the pressure container water level measuring device listed in table 2:
TABLE 1
TABLE 2
As described above, in conjunction with the contents of Table 1, the measurement of a narrow range meter can use Δ PNRIt is shown that the validity of the measured value of the narrow range meter can be obtained by using A _ delta P in Table 1NRDenotes that, in one application, if Δ PNREffective, then A _ DeltaP NR1, if Δ PNRInvalid, then A _ DeltaP NR0. Of course A. DELTA.PNROther numerical values, characters, letters, serial numbers and the like can also be selected to represent delta PNRThe effectiveness of this embodiment is not limited.
In practical application, when the pressure vessel water level measuring device needs to output the pressure vessel water level to a user, the pressure vessel water level measuring device can firstly obtain the validity of the measured value of the narrow-range meter, then further judge whether the measured value of the narrow-range meter is valid according to the validity of the measured value of the narrow-range meter, if the measured value of the narrow-range meter is valid, the method for outputting the pressure vessel water level by the pressure vessel water level measuring device under the valid condition is executed, and if the measured value of the narrow-range meter is invalid, the method for outputting the pressure vessel water level by the pressure vessel water level measuring device under the invalid condition is executed. It should be noted that whether the measured value of the narrow-range meter is valid or not may be determined in advance by the pressure vessel water level measuring device according to the actual application condition of the system or the operating state of the narrow-range meter, and the implementation is not limited thereto.
And S102, if the measured value of the narrow-range instrument is valid, judging whether the input parameter is valid.
The input parameters are used for calculating the water level of the pressure container, and optionally, the input parameters may specifically include a pressure container measured differential pressure value, a pressure container full-filling measured differential pressure equivalent value, a steam density, a liquid water density and the like, and are used for representing the property and state information of the pressure container. The measured differential pressure equivalent value when the pressure vessel is filled with water may be, specifically, a measured differential pressure equivalent value when the pressure vessel is satisfied at 100%.
The embodiment relates to a method for outputting the water level of a pressure container by a pressure container water level measuring device under the condition that the measured value of a narrow-range instrument is effective, in this case, the pressure container water level measuring device further needs to judge the effectiveness of an input parameter, and then different pressure container water level measuring methods are selected and executed according to the effectiveness of the input parameter. Specifically, if the input parameters are valid, it is stated that each input parameter is an input parameter obtained in a normal state, and at this time, the method for outputting the water level of the pressure vessel by the pressure vessel water level measuring device under the valid condition is executed, and if the input parameters are invalid, the method for outputting the water level of the pressure vessel by the pressure vessel water level measuring device under the invalid condition is executed.
S103, if the input parameters are valid, obtaining the equivalent value of the measured differential pressure when the pressure container is filled in the input parameters.
The embodiment relates to a method for outputting the water level of a pressure container by a pressure container water level measuring device under the condition that the measured value of a narrow-range instrument is effective and the input parameter is effective, which specifically comprises the following steps: the measured differential pressure equivalent value of the pressure container during full filling in the input parameters is obtained, and specifically, the measured differential pressure equivalent value of the pressure container during full filling can be obtained by using the pressure container differential pressure equivalent value measuring device in fig. 1, so that the water level of the pressure container can be determined according to the measured differential pressure equivalent value of the pressure container during full filling.
And S104, determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled fully.
After the pressure container water level measuring device obtains the pressure differential pressure equivalent value when the pressure container is fully filled according to the method described in S103, the pressure differential pressure equivalent value when the pressure container is fully filled and other input parameters may be further substituted into a preset calculation formula for calculating the pressure container water level, so as to calculate the pressure container water level, and enable the pressure container water level measuring device to output and display the value of the water level.
Optionally, the input parameters may specifically include a differential pressure equivalent value measured when the pressure vessel is full, a differential pressure value measured by the pressure vessel, a steam density of the pressure vessel, and a liquid water density of the pressure vessel.
If the input parameters include the four parameters, optionally, the calculation relation of the water level of the pressure container may be represented by the following relation (1):
for the explanation of the parameters in the relation (1) in this embodiment, please refer to the signal parameters listed in table 1, and the description will not be repeated here.
In the above embodiment, the different measurement methods are selected to be performed by judging whether the measured value of the narrow range meter is valid, wherein in the case where the measured value of the narrow range meter is valid, the pressure vessel water level measuring device determines the pressure vessel water level based on the measured differential pressure equivalent value at the time of the full filling of the pressure vessel in the input parameters. In practical application, the effective signal of the measured value of the narrow-range instrument is more stable than the feedback signal of the main pump, and the wrong effective signal can not be output due to system tripping, power failure and the like, so that the scheme adopts the effectiveness of the measured value of the narrow-range instrument as the basis of the system output measured value, and compared with the traditional scheme of adopting the feedback signal of the main pump as the basis of the system output measured value, the pressure container water level measured by the pressure container monitoring method provided by the scheme is more accurate, and errors can not occur. In addition, when the measured value of the narrow-range instrument is effective, the narrow-range instrument is equivalent to 0 or 1 main pump, and in the application scene, the dynamic pressure generated when the fluid in the main pump flows through the reactor core is very small, so that the head loss coefficient of the main pump does not need to be used for correcting the top of the pressure container, the times of overhaul of the system due to the fact that the head loss coefficient of the main pump needs to be readjusted are reduced, and the maintenance cost of the system is further reduced.
Fig. 3 is a flowchart of an implementation manner of S103 in the embodiment of fig. 2, where, as shown in fig. 3, the step S103 "obtaining the measured differential pressure equivalent value when the pressure vessel is full in the input parameter" includes:
s201, acquiring the bottom pressure difference of the pressure container, the top pressure difference of the pressure container and the average temperature value of the thermocouple.
In this embodiment, the pressure vessel bottom pressure difference, the pressure vessel top pressure difference, and the thermocouple average temperature value may be obtained in advance by the pressure vessel pressure difference equivalent value measuring apparatus according to the actual application requirement, so that the pressure vessel water level measuring apparatus is used when calculating the pressure vessel pressure difference measurement value.
S202, obtaining a measurement differential pressure equivalent value when the pressure container is fully filled according to the bottom differential pressure of the pressure container, the top differential pressure of the pressure container and the average temperature value of the thermocouple.
The embodiment relates to a process of measuring differential pressure equivalent value when pressure vessel fills fully of pressure vessel differential pressure equivalent value measuring device, specifically includes: when the pressure container pressure difference equivalent value measuring device acquires the bottom pressure difference of the pressure container, the top pressure difference of the pressure container and the thermocouple average temperature, the parameters can be substituted into a preset calculation relational expression, the measured pressure difference equivalent value when the pressure container is filled fully is obtained through calculation, the pressure container pressure difference equivalent value measuring device outputs the measured pressure difference equivalent value when the pressure container is filled fully to the pressure container water level measuring device, and the pressure container water level measuring device can measure the pressure container water level according to the obtained measured pressure difference equivalent value when the pressure container is filled fully.
Alternatively, the above-mentioned calculation relation may be specifically expressed by the following relation (2):
ΔPVSL 100＝(ρVSL 100×(H20(1+γ(TRIC-AVG-20))-H20HEAD(1+γ(TRIC-AVG-20)))
+ρhead 100×H20HEAD(1+γ(TRIC-AVG-20)))×g (2)；
wherein, Δ PVSL 100Represents the equivalent value of the measured differential pressure when the pressure container is 100 percent full; rhoVSL 100Representing the pressure vessel bottom pressure differential; rhohead 100Representing the pressure vessel's head pressure differential; t isRIC-AVGRepresents the thermocouple average temperature value; gamma represents a temperature coefficient; h20Represents the height of the pressure vessel at 20 ℃; h20HEADRepresents the top height of the pressure vessel at 20 ℃; g is 9.8N/kg.
Fig. 4 is a flowchart of an implementation manner of S202 in the embodiment of fig. 3, where, as shown in fig. 4, the step S202 "obtaining the equivalent value of the measured differential pressure when the pressure vessel is full according to the bottom differential pressure of the pressure vessel, the top differential pressure of the pressure vessel, and the average temperature value of the thermocouple" includes:
s301, determining the target height of the pressure container according to the average temperature value of the thermocouple, the temperature correction coefficient and the height of the pressure container at the preset temperature.
The preset temperature is 20 ℃, and the specific value can be other values, and can be set according to the actual application requirement, which is not limited in this embodiment. The present embodiment relates to a method for calculating a first parameter (target height of a pressure vessel) to be used when a pressure vessel pressure difference equivalent value measuring device calculates a pressure vessel pressure difference equivalent value when the pressure vessel is full, and the method can be implemented by using the following relation (3):
H＝H20[1+γ(TRIC-AVG-20)] (3)；
wherein H represents a target height of the pressure vessel; the other parameters in the relation (3) have the same physical meanings as those of the parameters in the relation (2), and for the specific explanation, reference is made to the foregoing description, and no repeated explanation is made here.
Accordingly, when the pressure vessel differential pressure equivalent value measuring device needs to calculate the target height of the pressure vessel, the above parameters can be substituted into the relation (3) to calculate the target height of the pressure vessel, so that the pressure vessel differential pressure equivalent value measuring device can calculate the measured differential pressure equivalent value when the pressure vessel is full according to the target height of the pressure vessel.
S302, determining the target top height of the pressure container according to the average temperature value of the thermocouple, the temperature correction coefficient and the top height of the pressure container at the preset temperature.
The present embodiment relates to a method for calculating a second parameter (target top height of a pressure vessel) to be used when a pressure vessel pressure difference equivalent value measuring device calculates a measured pressure difference equivalent value when the pressure vessel is full, and the method can be implemented by using the following relation (4):
HHEAD＝H20HEAD[1+γ(TRIC-AVG-20)] (4)；
wherein HHEADRepresenting a target top height of the pressure vessel; the other parameters in the relation (4) have the same physical meanings as those of the parameters in the relation (2), and for the specific explanation, reference is made to the foregoing description, and no repeated explanation is made here.
Accordingly, when the pressure vessel differential pressure equivalent value measuring device needs to calculate the target height of the pressure vessel, the above parameters can be substituted into the relation (4) to calculate the target top height of the pressure vessel, so that the pressure vessel differential pressure equivalent value measuring device can calculate the measured differential pressure equivalent value when the pressure vessel is full according to the target top height of the pressure vessel.
And S303, obtaining a measurement differential pressure equivalent value when the pressure container is fully filled according to the target height of the pressure container, the target top height of the pressure container, the top differential pressure of the pressure container and the bottom differential pressure of the pressure container.
When the pressure container differential pressure equivalent value measuring device obtains the target height of the pressure container and the target top height of the pressure container according to S301 and S202, the two parameters, the obtained top differential pressure of the pressure container and the obtained bottom differential pressure of the pressure container may be further substituted into the following relational expression (5) to be calculated, so as to obtain the measured differential pressure equivalent value when the pressure container is fully filled:
ΔPVSL 100＝(ρVSL 100×(H-HHEAD)+ρhead 100×HHEAD)×g (5)；
the parameters in the above relational expressions have the same physical meanings as those of the parameters in the above relational expressions (2) to (4), and for the specific explanation, reference is made to the above description, and no repeated explanation is made here.
It can be seen from the above relation (5) that, compared with the conventional calculation method, the method for calculating the effective value of the measured differential pressure when the pressure vessel is filled fully provided by the above embodiment does not need to correct the head loss coefficient of the main pump, that is, the head loss coefficient of the main pump is 0, and this method reduces the number of times of overhaul of the system due to readjustment of the head loss coefficient of the main pump, thereby reducing the maintenance cost of the system.
Fig. 5 is a flowchart of an implementation manner of S102 in the embodiment of fig. 2, the embodiment relates to a method for determining whether an input parameter is valid, and as shown in fig. 5, the step of "determining whether the input parameter is valid" in S102 includes:
s401, judging whether the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple are all effective.
When the pressure vessel water level measuring device judges whether the input parameters are effective, the effective values of three parameters, namely the effective value of the pressure vessel bottom pressure difference, the effective value of the pressure vessel top pressure difference and the thermocouple average temperature value, need to be judged firstly, so that the effectiveness of the pressure vessel full-filling measurement pressure difference equivalent value can be determined according to the effectiveness of the three parameters, and then the effectiveness of other parameters contained in the input parameters, such as the effectiveness of the pressure vessel measurement pressure difference value, the pressure vessel steam density, the pressure vessel liquid water density and other parameters, is combined to determine whether the input parameters are effective.
S402, if the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple are all effective, determining that the input parameters are effective.
When the pressure container water level measuring device determines the effectiveness of the pressure container bottom pressure difference, the pressure container top pressure difference and the thermocouple average temperature value, and the determined results indicate that the three parameters are effective, the pressure container water level measuring device considers that the pressure container full filling measurement pressure difference equivalent value in the input parameters is effective, and if other parameters in the input parameters are also effective, the input parameters are determined to be effective.
And S403, if any one of the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple is invalid, determining that the input parameter is invalid.
When the pressure container water level measuring device determines the effectiveness of the pressure container bottom pressure difference, the pressure container top pressure difference and the thermocouple average temperature value, and the determined result is that one or more parameters are invalid, the pressure container water level measuring device considers that the pressure container full filling pressure difference equivalent value in the input parameters is invalid, and then the input parameters are determined to be invalid.
While the embodiments of fig. 2 to 5 described above describe the method of measuring the water level of the pressure vessel by the pressure vessel water level measuring device in the case where the measured value of the narrow range meter is valid and the input parameter is invalid, the following embodiments describe the method of measuring the water level of the pressure vessel by the pressure vessel water level measuring device in the case where the measured value of the narrow range meter is valid and the input parameter is invalid, and the method of measuring the water level of the pressure vessel in the case where the measured value of the narrow range meter is invalid.
A first application scenario: the pressure container water level measuring device measures the water level of the pressure container under the condition that the measured value of the narrow-range instrument is effective and the input parameter is invalid. The method specifically comprises the following steps: and if the input parameters are invalid, taking the water level of the pressure container measured at the last moment as the water level of the pressure container.
The embodiment relates to a method for outputting the water level of a pressure container by a pressure container water level measuring device under the condition that the measured value of a narrow-range instrument is valid and an input parameter is invalid, wherein under the application condition, the input parameter may be inaccurate, and if the water level of the pressure container is calculated by using the input parameter, the water level of the pressure container measured at the last moment is also inaccurate, so that the pressure container water level measuring device can directly output and display the water level of the pressure container measured at the last moment as the water level of the pressure container so as to avoid introducing wrong calculation to cause wrong measurement.
A second application scenario: a method for measuring the water level of a pressure vessel in the event that the measurement value of a narrow range meter is invalid. The method specifically comprises the following steps: and if the measured value of the narrow-range meter is invalid, determining the water level of the pressure container according to the validity of the measured value of the wide-range meter.
The present embodiment relates to the step of selecting to perform a different measurement method by judging the validity of the measurement value of the wide range meter in the case where the measurement value of the narrow range meter is invalid, wherein the validity of the measurement value of the wide range meter is one input signal parameter of the pressure vessel water level measuring apparatus, which may be expressed by numerical values, for example, the validity of the measurement value of the wide range meter is set to 1 if the measurement value of the wide range meter is valid, and the validity of the measurement value of the wide range meter is set to 0 if the measurement value of the wide range meter is invalid.
In practical applications, when the pressure vessel water level measuring device determines that the measured value of the narrow-range meter is invalid, it needs to further determine whether the measured value of the wide-range meter is valid, so as to output different pressure vessel water levels according to the validity of the measured value of the wide-range meter, therefore, as shown in fig. 6, when the measured value of the wide-range meter is valid, a method for outputting the pressure vessel water level by the pressure vessel water level measuring device under the condition that the measured value of the wide-range meter is valid is executed, that is, the step of step S501; when the measured value of the wide range meter is invalid, the method of the pressure vessel water level measuring device outputting the pressure vessel water level in the case where the measured value of the wide range meter is invalid, that is, the step of step S502, is performed.
S501, if the measured value of the wide-range meter is valid, determining the water level of the pressure container according to the measured value of the wide-range meter and the measured range of the narrow-range meter.
The embodiment relates to a step of executing different measuring methods by judging whether the measuring value of the wide-range meter exceeds the measuring range of the narrow-range meter or not under the condition that the measuring value of the narrow-range meter is invalid and the measuring value of the wide-range meter is valid.
And S502, if the measured value of the wide-range meter is invalid, taking the water level of the pressure container measured at the last moment as the water level of the pressure container.
The embodiment relates to a method for outputting the water level of the pressure container by the pressure container water level measuring device under the condition that the measured value of the wide-range instrument is invalid, namely, the pressure container water level measuring device directly takes the water level of the pressure container measured at the last moment as the finally output and displayed water level of the pressure container.
Fig. 7 is a flowchart of an implementation of S501 in fig. 6, where, as shown in fig. 7, the S501 "determining the pressure vessel water level according to the measurement value of the wide-range meter and the measurement range of the narrow-range meter" includes:
s601, judging whether the measurement value of the wide-range meter exceeds the measurement range of the narrow-range meter, if so, executing the step S602, and if not, executing the step S603.
In practical applications, when the pressure vessel water level measuring device determines that the measured value of the narrow-range meter is invalid and the measured value of the wide-range meter is valid, it needs to further determine whether the measured value of the wide-range meter exceeds the measuring range of the narrow-range meter in order to select different pressure vessel water levels to be output, so that when the measured value of the wide-range meter exceeds the measuring range of the narrow-range meter, the method for outputting the pressure vessel water level by the pressure vessel water level measuring device under an out-of-range condition, that is, step S602, is performed, and when the measured value of the wide-range meter does not exceed the measuring range of the narrow-range meter, the method for outputting the pressure vessel water level by the pressure vessel water level measuring device under an out-of-range condition, that is, step.
And S602, determining the preset water level mandatory value as the water level of the pressure container.
The embodiment relates to a method for outputting the water level of a pressure container by a pressure container water level measuring device under the conditions that the measured value of a narrow-range instrument is invalid, the measured value of a wide-range instrument is valid, and the measured value of the wide-range instrument exceeds the measuring range of the narrow-range instrument.
And S603, taking the water level of the pressure container measured at the last moment as the water level of the pressure container.
The embodiment relates to a method for outputting the water level of a pressure container by a pressure container water level measuring device under the conditions that the measured value of a narrow-range instrument is invalid, the measured value of a wide-range instrument is valid, and the measured value of the wide-range instrument does not exceed the measuring range of the narrow-range instrument.
It should be noted that, when the pressure container water level measuring device calculates the pressure container water level according to any of the above embodiments, the effective value of the pressure container water level may be further set, specifically, may be set to 0 or 1, and the effective value is output and displayed. When the effective value of the pressure container water level is set to 0, the pressure container water level measuring device is used for indicating that the pressure container water level output by the pressure container water level measuring device is an invalid pressure container water level to a user; and when the effective value of the pressure container water level is set to 1, the effective pressure container water level is used for indicating the pressure container water level output by the pressure container water level measuring device to the user.
Optionally, when the pressure container water level measuring device obtains the calculated pressure container water level, the binary state information of the pressure container water level may be further set, and the binary state information is output and displayed. When the binary state information is set to be 0, the binary state information is used for indicating the water level of the pressure container output by the pressure container water level measuring device to a user as the calculated water level of the pressure container or the water level of the pressure container obtained by the corresponding water level of the pressure container at the last moment; when the binary state information is set to be 1, the binary state information is used for indicating the water level of the pressure container output by the pressure container water level measuring device to be a preset mandatory value to a user, and the setting of the binary state information of the water level of the pressure container is used for facilitating the user to distinguish the source of the water level of the pressure container.
In summary, the present application also provides a method for monitoring a water level of a pressure vessel of a nuclear power plant, as shown in fig. 8, the method includes:
and S701, judging whether the measurement value of the narrow-range meter is valid or not, if so, executing step S702, and if not, executing step S708.
And S702, judging whether the input parameters are valid or not, if the input parameters are valid, executing the step S703, and if the input parameters are invalid, executing the step S708.
And S703, acquiring the bottom pressure difference of the pressure container, the top pressure difference of the pressure container and the average temperature value of the thermocouple.
And S704, judging whether the bottom pressure difference of the pressure container, the top pressure difference of the pressure container and the average temperature value of the thermocouple are effective or not, if so, executing S705, and if not, executing S707.
S705, obtaining a pressure difference equivalent value when the pressure container is fully filled according to the bottom pressure difference of the pressure container, the top pressure difference of the pressure container and the average temperature value of the thermocouple.
S706, determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled fully, setting the effective value of the water level of the pressure container to be 1, setting the binary state information of the water level of the pressure container to be 0, and outputting and displaying the water level of the pressure container, the effective value of the water level of the pressure container and the binary state information of the water level of the pressure container.
And S707, taking the water level of the pressure container measured at the last moment as the water level of the pressure container, setting the effective value of the water level of the pressure container to be 0, setting the binary state information of the water level of the pressure container to be 0, and outputting and displaying the water level of the pressure container, the effective value of the water level of the pressure container and the binary state information of the water level of the pressure container.
And S708, judging whether the measured value of the wide-range meter is valid, if so, executing the step S709, and if not, executing the step S711.
And S709, judging whether the measurement value of the wide-range meter exceeds the measurement range of the narrow-range meter, if so, executing the step S710, and if not, executing the step S711.
S710, determining the preset water level mandatory value as the water level of the pressure container, setting the effective value of the water level of the pressure container to be 1, setting the binary state information of the water level of the pressure container to be 1, and outputting and displaying the water level of the pressure container, the effective value of the water level of the pressure container and the binary state information of the water level of the pressure container.
And S711, taking the water level of the pressure container measured at the last moment as the water level of the pressure container, setting the effective value of the water level of the pressure container to be 0, setting the binary state information of the water level of the pressure container to be 0, and outputting and displaying the water level of the pressure container, the effective value of the water level of the pressure container and the binary state information of the water level of the pressure container.
Based on the method for calculating the equivalent value of the differential pressure when the pressure container is fully filled by the differential pressure equivalent value measuring device of the pressure container described in the embodiments of fig. 3-5 and 8, the present application also provides a corresponding differential pressure equivalent value measuring device of the pressure container, as shown in fig. 9, which is used for calculating the equivalent value of the differential pressure when the pressure container is fully filled according to the input parameter (ρ |)VSL 100、A_ρVSL 100、ρhead 100、A_ρhead 100) Equivalent value (Δ P in the figure) of the measured differential pressure when filling a pressure vesselVSL 100) Carrying out measurement calculation and outputting the equivalent value delta P of the measured differential pressure when the pressure container is fully filledVSL 100And effective value A _ delta P of the measured differential pressure equivalent when the pressure vessel is fullVSL 100The pressure container water level measuring device is connected with the pressure container water level measuring module, so that the pressure container water level measuring module can normally output the pressure container water level to be measured.
Comparing the pressure vessel pressure difference equivalent value measuring device with the existing pressure vessel pressure difference equivalent value measuring device, as shown in the schematic diagram of the existing pressure vessel pressure difference equivalent value measuring device shown in fig. 9A, it can be seen that the pressure vessel pressure difference equivalent value measuring device does not consider the operation state of the main pump (N-RCPp in fig. 9A represents the number of the main pumps, i.e. the operation state of the reaction main pump), so that the pressure vessel pressure difference equivalent value measuring device of the present scheme does not select to switch and output the pressure vessel water level measured by the narrow range meter according to the feedback signal of the main pump when measuring the pressure vessel water level, and calculates the measured pressure difference equivalent value Δ P when the pressure vessel is fullVSL 100The head loss coefficient of the main pump (the head loss coefficient of the main pump is C in the figure) can be not considered0、C1、C2、C3) The method avoids the inaccuracy of the water level measurement of the pressure container caused by the inaccuracy of the feedback signal of the main pump and the inaccuracy of the head loss coefficient of the main pump.
Based on the method for calculating the water level of the pressure vessel by using the water level measuring device of the pressure vessel described in the embodiments of fig. 2, 6-8, the present application also provides a corresponding water level measuring device of the pressure vessel, as shown in fig. 10, which is used for calculating the water level of the pressure vessel according to the input parameter (Δ P)VSL、A_ΔPVSL、ΔPVSL 100、A_ΔPVSL 100、ρv、A_ρv、ρL、A_ρL、A_ΔPNR、ΔPWR、A_ΔPWR) And measuring and calculating the water level of the pressure container, and outputting the water level of the pressure container and the effective value of the water level of the pressure container.
Comparing the pressure vessel water level measuring device with the existing pressure vessel water level measuring device, as shown in the schematic diagram of the existing pressure vessel water level measuring device shown in fig. 10A, it can be seen that the input parameters of the pressure vessel water level measuring device have an effective value signal of the measured value of the narrow-range meter, and different pressure vessel water levels are selectively output by using the signal as a judgment basis, while the existing pressure vessel water level measuring device does not have an effective value signal of the measured value of the narrow-range meter, which indicates that the effective value signal is not judged according to the measured value of the narrow-range meter.
It should be understood that although the various steps in the flow charts of fig. 2-8 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-8 may include multiple sub-steps or phases that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or phases is not necessarily sequential.
In one embodiment, as shown in fig. 11, there is provided a nuclear power plant pressure vessel water level monitoring apparatus including: the device comprises a first judging module 11, a second judging module 12, an obtaining module 13 and a measuring module 14, wherein:
the first judgment module 11 is used for judging whether the measurement value of the narrow-range instrument is valid;
the second judging module 12 is used for judging whether the input parameter is valid when the measured value of the narrow-range instrument is valid; the input parameters are used for representing the attribute and state information of the pressure container;
the acquisition module 13 is used for acquiring a measurement differential pressure equivalent value of the input parameter when the pressure container is filled fully when the input parameter is effective;
and the measuring module 14 is used for determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled.
For specific definition of the nuclear power plant pressure vessel water level monitoring device, reference may be made to the above definition of a nuclear power plant pressure vessel water level monitoring method, and details are not repeated here. All or part of the modules in the nuclear power plant pressure vessel water level monitoring device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 12. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a nuclear power plant pressure vessel water level monitoring method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 12 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
judging whether the measured value of the narrow-range instrument is effective or not;
if the measured value of the narrow-range instrument is valid, judging whether the input parameter is valid;
if the input parameters are valid, acquiring a measurement differential pressure equivalent value when the pressure container in the input parameters is filled;
and determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled fully.
The implementation principle and technical effect of the computer device provided by the above embodiment are similar to those of the above method embodiment, and are not described herein again.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, the computer program, when executed by a processor, further implementing the steps of:
judging whether the measured value of the narrow-range instrument is effective or not;
if the measured value of the narrow-range instrument is valid, judging whether the input parameter is valid;
if the input parameters are valid, acquiring a measurement differential pressure equivalent value when the pressure container in the input parameters is filled;
and determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled fully.
The implementation principle and technical effect of the computer-readable storage medium provided by the above embodiments are similar to those of the above method embodiments, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), synchronous Link (Synchlink) DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A method for monitoring the water level of a pressure vessel of a nuclear power plant is characterized by comprising the following steps:
judging whether the measured value of the narrow-range instrument is effective or not;
if the measured value of the narrow-range instrument is valid, judging whether the input parameter is valid; the input parameters are used for representing the attribute and state information of the pressure container;
if the input parameters are valid, acquiring a measurement differential pressure equivalent value of the input parameters when the pressure container is filled fully;
and determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled fully.
2. The method of claim 1, wherein said obtaining a measured differential pressure equivalent of said input parameter at full fill of said pressure vessel comprises:
acquiring the bottom pressure difference of the pressure container, the top pressure difference of the pressure container and the average temperature value of a thermocouple;
and obtaining the equivalent value of the measured differential pressure when the pressure container is fully filled according to the bottom differential pressure of the pressure container, the top differential pressure of the pressure container and the average temperature value of the thermocouple.
3. The method of claim 2, wherein the obtaining the measured differential pressure equivalent at full fill of the pressure vessel from the pressure vessel bottom differential pressure, the pressure vessel top differential pressure, and the thermocouple mean temperature value comprises:
determining the target height of the pressure container according to the thermocouple average temperature value, the temperature correction coefficient and the height of the pressure container at the preset temperature;
determining the target top height of the pressure container according to the thermocouple average temperature value, the temperature correction coefficient and the top height of the pressure container at the preset temperature;
and obtaining a measurement differential pressure equivalent value when the pressure container is fully filled according to the target height of the pressure container, the target top height of the pressure container, the top differential pressure of the pressure container and the bottom differential pressure of the pressure container.
4. The method of any of claims 1-3, wherein said determining the pressure vessel water level from a measured differential pressure equivalent when the pressure vessel is full comprises:
and determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled with the liquid, the measured differential pressure value of the pressure container, the steam density of the pressure container and the liquid water density of the pressure container.
5. The method of claim 2 or 3, wherein said determining whether the input parameter is valid comprises:
judging whether the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple are all effective or not;
if the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple are all effective, determining that the input parameters are effective;
and if any one of the effective value of the pressure difference at the bottom of the pressure container, the effective value of the pressure difference at the top of the pressure container and the effective value of the average temperature value of the thermocouple is invalid, determining that the input parameter is invalid.
6. The method according to claim 1, characterized in that if the input variable is invalid, the pressure vessel water level measured at the previous moment is taken as the pressure vessel water level.
7. The method of claim 1, wherein if the narrow range meter measurement is invalid, determining the pressure vessel water level based on the validity of the wide range meter measurement.
8. The method of claim 7, wherein said determining the pressure vessel water level based on the validity of the wide range meter measurements comprises:
if the measured value of the wide-range meter is valid, determining the water level of the pressure container according to the measured value of the wide-range meter and the measured range of the narrow-range meter;
and if the measured value of the wide-range meter is invalid, taking the water level of the pressure container measured at the last moment as the water level of the pressure container.
9. The method of claim 8, wherein said determining the pressure vessel water level from the measurement of the wide range meter and the measurement of the narrow range meter comprises:
judging whether the measurement value of the wide-range meter exceeds the measurement range of the narrow-range meter;
if the water level exceeds the preset water level, determining a preset water level mandatory value as the water level of the pressure container;
and if the water level does not exceed the preset value, taking the water level of the pressure container measured at the previous moment as the water level of the pressure container.
10. A nuclear power plant pressure vessel water level monitoring device, the device characterized in that:
the first judgment module is used for judging whether the measurement value of the narrow-range instrument is effective or not;
the second judgment module is used for judging whether the input parameters are effective or not when the measured value of the narrow-range instrument is effective; the input parameters are used for representing the attribute and state information of the pressure container;
the acquisition module is used for acquiring a measurement differential pressure equivalent value of the input parameter when the pressure container is filled fully when the input parameter is effective;
and the measuring module is used for determining the water level of the pressure container according to the equivalent value of the measured differential pressure when the pressure container is filled with the liquid.
11. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 9 when executing the computer program.
12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 9.
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| CN103426488B (en) * | 2012-05-24 | 2016-08-03 | 中国核动力研究设计院 | A kind of reactor pressure vessel water level measurement method based on average density |
| CN204178730U (en) * | 2014-11-19 | 2015-02-25 | 中广核工程有限公司 | Pressurized-water reactor nuclear power plant pressure container water level measuring device |
| CN104681109B (en) * | 2015-03-12 | 2017-11-07 | 中广核工程有限公司 | A kind of nuclear power plant's pressure container water level measuring device and method |
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