CN114151362A - Nuclear power station main pump shaft seal leakage monitoring method and device and computer equipment - Google Patents
Nuclear power station main pump shaft seal leakage monitoring method and device and computer equipment Download PDFInfo
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- CN114151362A CN114151362A CN202111446938.2A CN202111446938A CN114151362A CN 114151362 A CN114151362 A CN 114151362A CN 202111446938 A CN202111446938 A CN 202111446938A CN 114151362 A CN114151362 A CN 114151362A
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- seal leakage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0077—Safety measures
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Abstract
The application relates to a method and a device for monitoring leakage of a main pump shaft seal of a nuclear power station, computer equipment and a storage medium. The method comprises the following steps: acquiring a primary shaft seal differential pressure signal, a primary circuit pressure signal and a shaft seal leakage flow signal; determining an upper limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; comparing the shaft seal leakage flow signal with an upper limit value of the shaft seal leakage flow, and comparing the shaft seal leakage flow signal with a lower limit value of the shaft seal leakage flow; and when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal. When the method is adopted to determine that the main pump is unsafe, an alarm signal is sent out to realize prompt reminding.
Description
Technical Field
The application relates to the technical field of nuclear power station main pumps, in particular to a nuclear power station main pump shaft seal leakage monitoring method, a nuclear power station main pump shaft seal leakage monitoring device, computer equipment and a storage medium.
Background
A nuclear power plant coolant pump (a main pump for short) is important equipment of a nuclear power plant, a shaft seal assembly in the main pump is a core precision component, the main function of the shaft seal assembly is to prevent radioactive coolant from leaking to a containment along a pump shaft, and the performance state of the shaft seal assembly directly influences the safe operation of the main pump.
In a traditional nuclear power station main pump shaft seal monitoring system, judgment is carried out according to the leakage amount of coolant in a nuclear power station main pump shaft seal, and whether supervision personnel intervene or not is determined according to the judgment result.
However, by adopting the method, the leakage amount of the coolant in the shaft seal can not be accurately detected by the monitoring system, and the monitoring system cannot prompt in time.
Disclosure of Invention
In view of the above, it is necessary to provide a method and an apparatus for monitoring a main pump shaft seal leakage in a nuclear power plant, a computer device and a storage medium.
A method for monitoring leakage of a main pump shaft seal of a nuclear power station comprises the following steps:
acquiring a primary shaft seal differential pressure signal, a primary circuit pressure signal and a shaft seal leakage flow signal;
determining an upper limit value of shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; wherein the first and second relationship functions are used to represent a relationship between pressure and flow;
comparing the shaft seal leakage flow signal with an upper limit value of the shaft seal leakage flow, and comparing the shaft seal leakage flow signal with a lower limit value of the shaft seal leakage flow;
and when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal.
In one embodiment, the determining an upper limit value of a shaft seal leakage flow rate according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow rate according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function includes:
comparing the primary shaft seal differential pressure signal with a first pressure threshold;
and according to a comparison result, inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the first relation function to obtain an upper limit value of the shaft seal leakage flow, and inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain a lower limit value of the shaft seal leakage flow.
In one embodiment, the inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the first relation function to obtain an upper limit value of the shaft seal leakage flow rate and inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain a lower limit value of the shaft seal leakage flow rate according to the comparison result includes:
when the primary shaft seal differential pressure signal is smaller than or equal to the first pressure threshold value, inputting the primary shaft seal differential pressure signal into a first relation function to obtain an upper limit value of shaft seal leakage flow, and inputting the primary shaft seal differential pressure signal into a second relation function to obtain a lower limit value of shaft seal leakage flow;
when the primary shaft seal differential pressure signal is larger than the first pressure threshold value, the primary circuit pressure signal is input into a first relation function to obtain an upper limit value of shaft seal leakage flow, and the primary circuit pressure signal is input into a second relation function to obtain a lower limit value of shaft seal leakage flow.
In one embodiment, the first relationship function is established in a manner that includes:
acquiring a reference upper limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment;
and fitting according to the reference upper limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a first relation function.
In one embodiment, a reference lower limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment are obtained;
and fitting according to the reference lower limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a second relation function.
In one embodiment, the outputting the alarm signal includes:
and outputting alarm signals of different types or different intensities according to the sizes of the leakage flow of the different shaft seals.
A nuclear power station main pump shaft seal leakage monitoring device, the device comprising:
the signal acquisition module is used for acquiring a primary shaft seal differential pressure signal and a primary circuit pressure signal;
the flow threshold value determining module is used for determining an upper limit value of shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; wherein the first and second relationship functions are used to represent a relationship between pressure and flow;
the comparison module is used for comparing the shaft seal leakage flow signal with the upper limit value of the shaft seal leakage flow and comparing the shaft seal leakage flow signal with the lower limit value of the shaft seal leakage flow;
and the alarm module is used for outputting an alarm signal when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow.
A nuclear power station main pump bearing seal leakage monitoring device, the device still includes: the flow determining module is further configured to compare the primary shaft seal differential pressure signal with a first pressure threshold, input the primary shaft seal differential pressure signal or the primary circuit pressure signal into the first relation function to obtain an upper limit value of the shaft seal leakage flow according to a comparison result, and input the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain a lower limit value of the shaft seal leakage flow.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring a primary shaft seal differential pressure signal and a primary circuit pressure signal;
determining an upper limit value of shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; wherein the first and second relationship functions are used to represent a relationship between pressure and flow;
comparing the shaft seal leakage flow signal with an upper limit value of shaft seal leakage flow, and comparing a lower limit value of the shaft seal leakage flow with the upper limit value of the shaft seal leakage flow;
and when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring a primary shaft seal differential pressure signal, a primary circuit pressure signal and a shaft seal leakage flow signal;
determining an upper limit value of shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; wherein the first and second relationship functions are used to represent a relationship between pressure and flow;
comparing the shaft seal leakage flow signal with an upper limit value of the shaft seal leakage flow, and comparing the shaft seal leakage flow signal with a lower limit value of the shaft seal leakage flow;
and when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal.
The method, the device, the computer equipment and the storage medium for monitoring the leakage of the main pump shaft seal of the nuclear power station acquire a primary shaft seal differential pressure signal, a primary circuit pressure signal and a shaft seal leakage flow signal; determining the upper limit value of the shaft seal leakage flow according to the primary shaft seal pressure difference signal, the primary circuit pressure signal and the first relation function, determining the lower limit value of the shaft seal leakage flow according to the primary shaft seal pressure difference signal, the primary circuit pressure signal and the second relation function, comparing the shaft seal leakage flow signal with the upper limit value of the shaft seal leakage flow, comparing the shaft seal leakage flow signal with the lower limit value of the shaft seal leakage flow, and outputting an alarm signal when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow. Through the input of one-level shaft seal differential pressure signal or a return circuit pressure signal, obtain accurate shaft seal and let out the leakage quantity threshold value, let out the comparison of leakage quantity threshold value through the shaft seal and let out the leakage quantity and confirm whether the main pump is in safe state, when unsafe, send alarm signal to realize timely warning.
Drawings
FIG. 1 is an application environment diagram of a main pump shaft seal leakage monitoring method in a nuclear power plant according to an embodiment;
FIG. 2 is a schematic flow chart of a main pump shaft seal leakage monitoring method in a nuclear power plant according to an embodiment;
FIG. 3 is a reference diagram of a primary shaft seal leakage flow operating interval;
FIG. 4 is a schematic diagram of a related art for monitoring leakage of a primary shaft seal of a main pump of a nuclear power plant;
FIG. 5 is a schematic flow chart of a main pump shaft seal leakage monitoring method in another embodiment of the nuclear power plant;
FIG. 6 is a block diagram showing a structure of a main pump shaft seal leakage monitoring device in a nuclear power plant according to an embodiment;
FIG. 7 is a diagram illustrating an internal structure 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 leakage of the main pump shaft seal of the nuclear power station can be applied to the application environment shown in figure 1. The nuclear power plant main pump shaft seal leakage monitoring system 102 is connected with a nuclear power plant main pump 104. A nuclear power station main pump shaft seal leakage monitoring system 102 acquires a primary shaft seal differential pressure signal, a primary circuit pressure signal and a shaft seal leakage flow signal in a nuclear power station main pump 104; determining an upper limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; wherein the first relation function and the second relation function are used for representing the relation between the pressure and the flow; comparing the shaft seal leakage flow signal with an upper limit value of the shaft seal leakage flow, and comparing the shaft seal leakage flow signal with a lower limit value of the shaft seal leakage flow; and when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal. The shaft seal leakage condition can be accurately detected, and an alarm signal and a prompt are given.
In one embodiment, as shown in fig. 2, a method for monitoring a seal leakage of a main pump shaft of a nuclear power plant is provided, which is described by taking the method as an example of being applied to the system for monitoring the seal leakage of the main pump shaft of the nuclear power plant in fig. 1, and includes the following steps:
Wherein, the main pump shaft seal subassembly comprises three series connection shaft seals. The first shaft seal is a liquid film seal capable of controlling leakage, the second shaft seal and the third shaft seal are friction surface seals, wherein the first shaft seal is a primary shaft seal, and the medium pressure generated at the primary shaft seal is a primary shaft seal differential pressure under the action of centrifugal force of a back blade (or an auxiliary impeller) when the main pump works. And measuring the primary shaft seal differential pressure through a pressure measuring instrument to obtain a primary shaft seal differential pressure signal. The primary circuit pressure refers to the pressure of the cooling water that maintains normal operation of the main pump.
Specifically, a pressure measuring instrument measures at a primary shaft seal to obtain a primary shaft seal differential pressure signal, the pressure measuring instrument measures at a voltage stabilizer to obtain a primary loop pressure signal, and a flow measuring instrument measures at the primary shaft seal to obtain a shaft seal leakage flow signal. The pressure measuring instrument is an industrial automatic instrument for measuring gas or liquid pressure, and the flow measuring instrument is an industrial automatic instrument for measuring the flow of liquid, gas or steam and other fluids in a pipeline or an open ditch. The voltage stabilizer is a device for stabilizing the output voltage in a main pump system and is mainly used for maintaining the pressure of cooling water of a loop. And the processor acquires a primary shaft seal differential pressure signal and a primary circuit pressure signal measured by the pressure measuring instrument.
The shaft seal leakage flow refers to the main coolant flow leaked by the main pump shaft seal. The first relation function is a corresponding function between the upper limit of the shaft seal leakage flow and the pressure. The second relation function is a corresponding function relation between the lower limit of the shaft seal leakage flow and the pressure. A first function generator may be generated according to a first relationship function and a second function generator may be generated according to a second relationship function. The first function generator and the second function generator are used for converting different signal sources through a functional relation to output a shaft seal leakage flow result.
Specifically, the processor inputs the obtained primary shaft seal differential pressure signal and the obtained primary circuit pressure signal into a first function generator and a second function generator, processes and outputs an upper limit value of shaft seal leakage flow through a first relation function in the first function generator, and outputs a lower limit value of shaft seal leakage flow through a second relation function in the second function generator.
Specifically, the processor compares the shaft seal leakage flow rate with an upper limit value of the obtained shaft seal leakage flow rate, and compares the shaft seal leakage flow rate with a lower limit value of the obtained shaft seal leakage flow rate.
And 208, when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow, or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal.
Specifically, the processor obtains a comparison result between the shaft seal leakage flow signal and an upper limit value of the shaft seal leakage flow and a lower limit value of the shaft seal leakage flow, and outputs an alarm signal when the shaft seal leakage flow is greater than the upper limit value of the shaft seal leakage flow or is less than the lower limit value of the shaft seal leakage flow. The alarm signal may include at least one of a computer digital alarm signal and a master hard optical word alarm signal, but is not limited thereto. The computer digital alarm signal is an alarm signal generated by combining digital video image recording with a multi-picture image display function and a monitoring alarm function. The master control hard light character alarm signal refers to alarm light emitters with different colors arranged on a master control case, and the corresponding light emitters are controlled to emit light according to different leakage flows. In addition, the alarm signal may also comprise an audible alarm signal. The sound alarm device can send out different types of sound alarm signals according to different leakage flow rates, and can also send out sound alarm signals with different intensities according to different leakage flow rates.
In one possible implementation, the outputting the alarm signal may include: and sending out different types of alarm signals according to different leakage flow sizes. When the shaft seal leakage flow signal is larger than the upper limit value of the shaft seal leakage flow, a first type of alarm signal is output. For example, the first type of alarm signal may be a sea wave sound or a red light. And when the shaft seal leakage flow signal is smaller than the lower limit value of the shaft seal leakage flow, outputting a second type of alarm signal. The second type of alarm signal may be a beep or a yellow light. In another possible implementation, the outputting the alarm signal may include: and sending out alarm signals with different intensities according to different leakage flow rates. The greater the leakage flow, the greater the intensity of the alarm signal. When the shaft seal leakage flow signal is larger than the upper limit value of the shaft seal leakage flow, outputting an alarm signal with first intensity; and when the shaft seal leakage flow signal is smaller than the lower limit value of the shaft seal leakage flow, outputting an alarm signal with second intensity, wherein the first intensity is greater than the second intensity. The alarm signal may comprise one or more of a light signal and an audible alarm signal.
In the method for monitoring the leakage of the main pump shaft seal of the nuclear power station, a primary shaft seal pressure difference signal, a primary circuit pressure signal and a shaft seal leakage flow signal are obtained; determining the upper limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining the lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; wherein the first relation function and the second relation function are used for representing the relation between the pressure and the flow; comparing the shaft seal leakage flow signal with an upper limit value of the shaft seal leakage flow, and comparing the shaft seal leakage flow signal with a lower limit value of the shaft seal leakage flow; and when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal. Through the input of one-level shaft seal differential pressure signal or a return circuit pressure signal, obtain accurate shaft seal and let out the leakage quantity threshold value, let out the comparison of leakage quantity threshold value through the shaft seal and let out the leakage quantity and confirm whether the main pump is in safe state, when unsafe, send alarm signal to realize timely warning.
In one embodiment, determining an upper limit value of the shaft seal leakage flow rate according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relationship function, and determining a lower limit value of the shaft seal leakage flow rate according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relationship function comprises: comparing the primary shaft seal differential pressure signal with a first pressure threshold; and according to the comparison result, inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the first relation function to obtain the upper limit value of the shaft seal leakage flow, and inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain the lower limit value of the shaft seal leakage flow.
The first pressure threshold is a pressure limit value set for comparing the primary shaft seal pressure difference and the primary circuit pressure, and can be set according to requirements.
Specifically, the processor obtains a primary shaft seal pressure difference signal and a primary circuit pressure signal, compares the primary shaft seal pressure difference with a first pressure threshold, and if the primary shaft seal pressure difference is equal to or smaller than the first pressure threshold, inputs the primary shaft seal pressure difference into a first relation function to obtain an upper limit value of shaft seal leakage flow, and inputs the primary shaft seal pressure difference into a second relation function to obtain a lower limit value of shaft seal leakage flow. If the primary shaft seal pressure difference is larger than the first pressure threshold value, the primary circuit pressure is input into the first relation function to obtain an upper limit value of the shaft seal leakage flow, and the primary circuit pressure is input into the second relation function to obtain a lower limit value of the shaft seal leakage flow. And corresponding function input information is determined according to the comparison result, the calculation efficiency is high, and the timeliness of shaft seal leakage detection is improved.
In one embodiment, the first relationship function is established in a manner that includes: acquiring a reference upper limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment; and fitting according to the reference upper limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a first relation function.
The operation interval of the leakage flow of the first-stage shaft seal in the standard equipment is obtained by preparing a main pump machine of the nuclear power station by an experimenter through a plurality of times of scientific experimental analysis and calculation, and when the main pump normally operates under standardization, the operation interval of the leakage flow of the shaft seal and a corresponding pressure interval are obtained.
Specifically, the processor obtains a first relation function by calculating and fitting according to a reference upper limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval shown in fig. 3 in the standard equipment. The first relationship function may be a linear function, a power function, an exponential function, or the like. For example, the processor obtains a linear function through linear fitting according to a reference upper limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in the standard equipment, for example, y1 is ax1+ b, where y1 is the shaft seal leakage flow, x1 is the upper limit value of the pressure, and a and b are constants. In the embodiment, the first relation function is obtained by fitting the reference upper limit value of the leakage flow of the primary shaft seal in the standard equipment and the corresponding pressure value, the calculation is simple and convenient, and the processor resource is saved.
In one embodiment, the second relationship function is established in a manner that includes: acquiring a reference lower limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment; and fitting according to the reference lower limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a second relation function.
Specifically, the processor obtains the second relation function by calculating and fitting according to a reference lower limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval shown in fig. 3 in the standard equipment. The second relationship function may be a linear function, a power function, an exponential function, or the like. For example, the processor obtains a linear function through linear fitting according to a reference lower limit value of a primary shaft seal leakage flow operation interval in the standard equipment and a corresponding pressure value, for example, y2 ═ cx2+ d, where y2 is the shaft seal leakage flow, x2 is the lower limit value of the pressure, and c and d are constants. In the embodiment, the second relation function is obtained by fitting the reference lower limit value of the leakage flow of the primary shaft seal in the standard equipment and the corresponding pressure value, the calculation is simple and convenient, and the processor resource is saved.
In one embodiment, outputting an alarm signal comprises:
and outputting alarm signals of different types or different intensities according to the sizes of the leakage flow of the different shaft seals.
The alarm signal refers to at least one of sound alarm signals of different types and different intensities, main control hard light word alarm signals of different brightnesses, and main control light word alarm signals of different colors, but is not limited thereto.
Specifically, the processor obtains a shaft seal leakage flow signal, when the shaft seal leakage flow signal is larger than the upper limit value of the shaft seal leakage flow, a rapid sound alarm signal and a red main control light word alarm signal are output, and when the shaft seal leakage flow signal is smaller than the lower limit value of the shaft seal leakage flow, a clear sound alarm signal or a yellow main control light word alarm signal is sent out.
In order to make the technical solution of the present application clearer, the following description is made with reference to specific applications. As shown in FIG. 4, when a leakage flow meter (wide range) MD1 of a primary shaft seal of a main pump is higher than XU1 (threshold value, namely H1 threshold value (1200L/H)), a computer digital alarm KA1 and a main control hard light alarm AA are triggered to warn that the shaft seal of the main pump is possibly damaged, an operator is reminded to immediately execute operation regulations, and after the state of the shaft seal of the main pump is verified, the main pump is reminded to immediately execute the operation regulationsAnd (6) performing intervention. When the measured value of the main pump primary shaft seal leakage flow meter (wide range) MD1 is higher than H2 threshold value (1400L/H) and lasts for 10s, and the pressure 4 of the primary circuit takes 2 to be higher than 27bar (bar is a unit of pressure, 1bar is 1 multiplied by 10 to obtain the pressure of 1bar5Pa), triggering a main pump to stop running, and automatically closing the 1-stage shaft seal leakage pipeline isolation valve after 75 s. When the measured value of a primary shaft seal leakage flow meter (narrow range) MD2 of the main pump is smaller than or equal to an L1 threshold value (250L/h), and meanwhile, a safety injection signal is not locked by P11(P11 is an allowable signal in a nuclear power control system, and is triggered when the pressure of a voltage stabilizer is lower than 138 bar), a computer digital alarm KA2 and a main control hard light character alarm AA are triggered, the early warning that the shaft seal of the main pump is possibly damaged along with the rise of the temperature of a bearing is realized, and an operator is reminded to intervene after verification. According to the design of the current main pump one-stage shaft seal leakage flow alarm, when the shaft seal leakage flow is low, a computer digital alarm KA2 is inhibited by a P11 signal, when the pressure of a voltage stabilizer is lower than 138bar, a P11 signal is triggered, when the pressure of a set is higher than 143bar, a P11 signal disappears, therefore, when the pressure of the set is lower than 143bar, the shaft seal leakage flow low alarm cannot be triggered, according to the equipment requirement of a main pump, the main pump is allowed to start only when the main pump one-stage shaft seal differential pressure MP1 (the range is 0-28bar) is larger than 19bar, and by combining the above conditions, when the main pump shaft seal differential pressure/primary circuit pressure is in the range of 19 bar-143 bar, the shaft seal leakage flow low alarm is inhibited and cannot be triggered due to the fact that a safety injection signal is blocked by a P11 signal. And the leakage flow rate of the main pump shaft seal is high, the alarm threshold value is 1200L/h, the alarm threshold value is the upper limit value of the operation range of the main pump under the normal operation working condition of the unit (the pressure of a primary circuit is 154bar), and the integrity of the main pump shaft seal state at the low-pressure stage of the primary circuit cannot be effectively monitored.
According to the method for monitoring the leakage of the main pump shaft seal of the nuclear power station, according to the running range of the leakage flow of the main pump shaft seal, the shaft seal flow high computer digital alarm KA3, the flow low computer digital alarm KA4 and the main control hard light character alarm AA are added in the start/stop stage of a newly added unit, so that the problems of the integrity and the effectiveness of the current alarm monitoring are solved. The following describes specific steps of a main pump shaft seal leakage monitoring method for a nuclear power plant in combination with a detailed embodiment, as shown in fig. 5:
(1) measuring a primary shaft seal differential pressure and the pressure at the pressure stabilizer through a pressure measuring instrument to obtain a primary shaft seal differential pressure signal and a primary loop pressure signal;
(2) referring to a primary shaft seal leakage flow operation interval diagram in a main pump equipment operation maintenance specification, fitting a first relation function GD1 according to the upper limit value of the shaft seal leakage flow and the corresponding pressure value, and fitting a second relation function GD2 according to the lower limit value of the shaft seal leakage flow and the corresponding pressure value;
(3) the range of the shaft seal differential pressure signal MP1 is 0-28bar, the range of the primary circuit pressure signal MP2 is 0-200 bar, and in order to ensure the accuracy of measurement and the relevance of the leakage amount of the shaft seal, the high limit of the shaft seal differential pressure is set, namely, a first pressure threshold value of 25bar is set. Comparing the obtained primary shaft seal differential pressure signal MP1 with a first pressure threshold value of 25bar, if the primary shaft seal differential pressure signal MP1 is less than or equal to the first pressure threshold value of 25bar, inputting the primary shaft seal differential pressure signal into a first relation function GD1 to obtain an upper limit value of shaft seal leakage flow, and inputting the primary shaft seal differential pressure signal into a second relation function GD2 to obtain a lower limit value of shaft seal leakage flow; if the primary shaft seal differential pressure signal MP1 is greater than the first pressure threshold, inputting a primary circuit pressure signal MP2 into a first relation function GD1 to obtain an upper limit value of shaft seal leakage flow, and inputting a primary circuit pressure signal into a second relation function GD2 to obtain a lower limit value of shaft seal leakage flow;
(4) obtaining the shaft seal leakage flow through a flow measuring instrument MP1 or MP2, comparing the shaft seal leakage flow with the upper limit value of the shaft seal leakage flow, if the shaft seal leakage flow is larger than the upper limit value of the shaft seal leakage flow, outputting an alarm signal that the shaft seal leakage flow is too high, triggering a computer digital alarm KA3 and a master control hard light word alarm AA, if the shaft seal leakage flow is smaller than the lower limit value of the seal leakage flow, outputting an alarm signal that the shaft seal leakage flow is too low, triggering a computer digital alarm KA4 and a master control hard light word alarm AA, and reminding a supervisor of the abnormal situation and processing.
According to the method for monitoring the leakage of the main pump shaft seal of the nuclear power station, the shaft seal leakage flow value can be accurately calculated through inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal, the running state of the main pump can be accurately judged according to the comparison result of the shaft seal leakage flow value and the calculated shaft seal leakage flow value, and the accurate and reliable monitoring effect can be achieved.
It should be understood that, although the steps in the flowchart of fig. 2 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 a portion of the steps in fig. 2 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, as shown in fig. 6, there is provided a main pump shaft seal leakage monitoring device for a nuclear power plant, including: a signal acquisition module 310, a flow threshold determination module 320, a comparison module 330, and an alarm module 340, wherein:
a signal obtaining module 310, configured to obtain a primary shaft seal differential pressure signal and a primary circuit pressure signal;
a flow threshold determining module 320, configured to determine an upper limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal, and the first relation function, and determine a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal, and the second relation function; wherein the first relation function and the second relation function are used for representing the relation between the pressure and the flow;
the comparison module 330 is used for outputting an alarm signal if the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow and the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow;
and the alarm module 340 is configured to output an alarm signal when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow, or the shaft seal leakage flow signal is smaller than the lower limit value of the shaft seal leakage flow.
In one embodiment, the flow threshold determining module 320 is further configured to compare the primary shaft seal differential pressure signal with a first pressure threshold, input the primary shaft seal differential pressure signal or a primary circuit pressure signal into the first relation function to obtain an upper limit value of the shaft seal leakage flow according to a comparison result, and input the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain a lower limit value of the shaft seal leakage flow.
In one embodiment, the flow threshold determining module 320 is further configured to, when the primary shaft seal differential pressure signal is less than or equal to the first pressure threshold, input the primary shaft seal differential pressure signal into the first relation function to obtain an upper limit value of the shaft seal leakage flow, and input the primary shaft seal differential pressure signal into the second relation function to obtain a lower limit value of the shaft seal leakage flow; when the primary shaft seal differential pressure signal is larger than the first pressure threshold value, the primary circuit pressure signal is input into the first relation function to obtain an upper limit value of the shaft seal leakage flow, and the primary circuit pressure signal is input into the second relation function to obtain a lower limit value of the shaft seal leakage flow.
In an embodiment, the main pump shaft seal leakage monitoring device for a nuclear power plant further includes: and a function establishing module.
The function establishing module is used for acquiring a reference upper limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment; and fitting according to the reference upper limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a first relation function. Acquiring a reference lower limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment; and fitting according to the reference lower limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a second relation function.
In one embodiment, the alarm module 340 is further configured to output different types or different intensities of alarm signals according to the magnitude of the leakage flow of the shaft seal.
For specific limitations of the main pump shaft seal leakage monitoring device in the nuclear power plant, reference may be made to the above limitations of the main pump shaft seal leakage monitoring method in the nuclear power plant, and details are not described here. All modules in the main pump shaft seal leakage monitoring device for the nuclear power station can be completely or partially realized through 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 server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, and a network interface 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, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer equipment is used for storing main pump data of the nuclear power station. 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 realize a method for monitoring the leakage of the main pump shaft seal of the nuclear power station.
Those skilled in the art will appreciate that the architecture shown in fig. 7 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:
acquiring a primary shaft seal differential pressure signal and a primary circuit pressure signal; determining an upper limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; wherein the first relation function and the second relation function are used for representing the relation between the pressure and the flow; comparing the shaft seal leakage flow signal with an upper limit value of the shaft seal leakage flow, and comparing the shaft seal leakage flow signal with a lower limit value of the shaft seal leakage flow; and when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining an upper limit value of the shaft seal leakage flow according to the obtained primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the obtained primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function, wherein the method comprises the following steps: comparing the primary shaft seal differential pressure signal with a first pressure threshold; and according to the comparison result, inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the first relation function to obtain the upper limit value of the shaft seal leakage flow, and inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain the lower limit value of the shaft seal leakage flow.
In one embodiment, the processor, when executing the computer program, further performs the steps of: inputting a first-stage shaft seal differential pressure signal or a primary circuit pressure signal into a first relation function to obtain an upper limit value of shaft seal leakage flow, and inputting the first-stage shaft seal differential pressure signal or the primary circuit pressure signal into a second relation function to obtain a lower limit value of shaft seal leakage flow, and the method comprises the following steps: when the primary shaft seal differential pressure signal is smaller than or equal to the first pressure threshold value, the primary shaft seal differential pressure signal is input into a first relation function to obtain an upper limit value of shaft seal leakage flow, and the primary shaft seal differential pressure signal is input into a second relation function to obtain a lower limit value of shaft seal leakage flow; when the primary shaft seal differential pressure signal is larger than the first pressure threshold value, the primary circuit pressure signal is input into the first relation function to obtain an upper limit value of the shaft seal leakage flow, and the primary circuit pressure signal is input into the second relation function to obtain a lower limit value of the shaft seal leakage flow.
In one embodiment, the processor, when executing the computer program, further performs the steps of: the first relation function is established in a mode that: acquiring a reference upper limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment; and fitting according to the reference upper limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a first relation function.
In one embodiment, the processor, when executing the computer program, further performs the steps of: the second relation function is established in a manner that: acquiring a reference lower limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment; and fitting according to the reference lower limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a second relation function.
In one embodiment, the processor, when executing the computer program, further performs the steps of: wherein outputting the alarm signal comprises: and outputting alarm signals of different types or different intensities according to the sizes of the leakage flow of the different shaft seals.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
In an embodiment, a computer program product is provided, comprising a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
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 can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
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 application, 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 concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A nuclear power station main pump shaft seal leakage monitoring method is characterized by comprising the following steps:
acquiring a primary shaft seal differential pressure signal, a primary circuit pressure signal and a shaft seal leakage flow signal;
determining an upper limit value of shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary shaft seal differential pressure signal or a primary circuit pressure signal and a first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal or the primary circuit pressure signal and a second relation function; wherein the first and second relationship functions are used to represent a relationship between pressure and flow;
comparing the shaft seal leakage flow signal with an upper limit value of the shaft seal leakage flow, and comparing the shaft seal leakage flow signal with a lower limit value of the shaft seal leakage flow;
and when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow, outputting an alarm signal.
2. The method for monitoring the main pump shaft seal leakage of the nuclear power plant according to claim 1, wherein the determining an upper limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function comprises:
comparing the primary shaft seal differential pressure signal with a first pressure threshold;
and according to a comparison result, inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the first relation function to obtain an upper limit value of the shaft seal leakage flow, and inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain a lower limit value of the shaft seal leakage flow.
3. The method for monitoring the shaft seal leakage of the main pump of the nuclear power plant according to claim 2, wherein the step of inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the first relation function to obtain an upper limit value of the shaft seal leakage flow and inputting the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain a lower limit value of the shaft seal leakage flow according to the comparison result comprises the steps of:
when the primary shaft seal differential pressure signal is smaller than or equal to the first pressure threshold value, inputting the primary shaft seal differential pressure signal into a first relation function to obtain an upper limit value of shaft seal leakage flow, and inputting the primary shaft seal differential pressure signal into a second relation function to obtain a lower limit value of shaft seal leakage flow;
when the primary shaft seal differential pressure signal is larger than the first pressure threshold value, the primary circuit pressure signal is input into a first relation function to obtain an upper limit value of shaft seal leakage flow, and the primary circuit pressure signal is input into a second relation function to obtain a lower limit value of shaft seal leakage flow.
4. The method for monitoring the shaft seal leakage of the main pump of the nuclear power plant according to claim 1, wherein the first relation function is established in a manner that includes:
acquiring a reference upper limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment;
and fitting according to the reference upper limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a first relation function.
5. The method for monitoring the shaft seal leakage of the main pump of the nuclear power plant according to claim 1, wherein the second relation function is established in a manner that includes:
acquiring a reference lower limit value and a corresponding pressure value of a primary shaft seal leakage flow operation interval in standard equipment;
and fitting according to the reference lower limit value of the primary shaft seal leakage flow operation interval in the standard equipment and the corresponding pressure value to obtain a second relation function.
6. The method for monitoring the shaft seal leakage of the main pump of the nuclear power plant according to claim 1, wherein the outputting of the alarm signal comprises:
and outputting alarm signals of different types or different intensities according to the sizes of the leakage flow of the different shaft seals.
7. A nuclear power station main pump shaft seal leakage monitoring device, its characterized in that, the device includes:
the signal acquisition module is used for acquiring a primary shaft seal differential pressure signal, a primary circuit pressure signal and a shaft seal leakage flow signal;
the flow threshold value determining module is used for determining an upper limit value of shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the first relation function, and determining a lower limit value of the shaft seal leakage flow according to the primary shaft seal differential pressure signal, the primary circuit pressure signal and the second relation function; wherein the first and second relationship functions are used to represent a relationship between pressure and flow;
the comparison module is used for comparing the shaft seal leakage flow signal with the upper limit value of the shaft seal leakage flow and comparing the shaft seal leakage flow signal with the lower limit value of the shaft seal leakage flow;
and the alarm module is used for outputting an alarm signal when the shaft seal leakage flow signal is greater than the upper limit value of the shaft seal leakage flow or the shaft seal leakage flow signal is less than the lower limit value of the shaft seal leakage flow.
8. The apparatus for monitoring shaft seal leakage of a main pump of a nuclear power plant according to claim 7, wherein the flow determination module is further configured to compare the primary shaft seal differential pressure signal with a first pressure threshold, input the primary shaft seal differential pressure signal or the primary circuit pressure signal into the first relation function to obtain an upper limit value of the shaft seal leakage flow according to a comparison result, and input the primary shaft seal differential pressure signal or the primary circuit pressure signal into the second relation function to obtain a lower limit value of the shaft seal leakage flow.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 6.
10. 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 6.
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